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authorJason Gunthorpe2018-08-16 13:08:18 -0600
committerJason Gunthorpe2018-08-16 13:12:00 -0600
commit89982f7ccee2fcd8fea7936b81eec6defbf0f131 (patch)
treefc553c8d008d24595ad7de0ea0f3b56f656da27c /lib
parenta1ceeca679dccc492235f0f629d9e9f7b3d51ca8 (diff)
parent94710cac0ef4ee177a63b5227664b38c95bbf703 (diff)
Merge tag 'v4.18' into rdma.git for-next
Resolve merge conflicts from the -rc cycle against the rdma.git tree: Conflicts: drivers/infiniband/core/uverbs_cmd.c - New ifs added to ib_uverbs_ex_create_flow in -rc and for-next - Merge removal of file->ucontext in for-next with new code in -rc drivers/infiniband/core/uverbs_main.c - for-next removed code from ib_uverbs_write() that was modified in for-rc Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig47
-rw-r--r--lib/Kconfig.kasan3
-rw-r--r--lib/Kconfig.ubsan11
-rw-r--r--lib/Makefile12
-rw-r--r--lib/dec_and_lock.c16
-rw-r--r--lib/dma-debug.c1773
-rw-r--r--lib/dma-direct.c204
-rw-r--r--lib/dma-noncoherent.c102
-rw-r--r--lib/dma-virt.c61
-rw-r--r--lib/iov_iter.c77
-rw-r--r--lib/percpu_ida.c2
-rw-r--r--lib/refcount.c28
-rw-r--r--lib/rhashtable.c27
-rw-r--r--lib/scatterlist.c6
-rw-r--r--lib/swiotlb.c1087
-rw-r--r--lib/test_bpf.c20
-rw-r--r--lib/test_printf.c7
17 files changed, 161 insertions, 3322 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index e34b04b56057..706836ec314d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -420,60 +420,15 @@ config HAS_IOPORT_MAP
depends on HAS_IOMEM && !NO_IOPORT_MAP
default y
-config HAS_DMA
- bool
- depends on !NO_DMA
- default y
+source "kernel/dma/Kconfig"
config SGL_ALLOC
bool
default n
-config NEED_SG_DMA_LENGTH
- bool
-
-config NEED_DMA_MAP_STATE
- bool
-
-config ARCH_DMA_ADDR_T_64BIT
- def_bool 64BIT || PHYS_ADDR_T_64BIT
-
config IOMMU_HELPER
bool
-config ARCH_HAS_SYNC_DMA_FOR_DEVICE
- bool
-
-config ARCH_HAS_SYNC_DMA_FOR_CPU
- bool
- select NEED_DMA_MAP_STATE
-
-config DMA_DIRECT_OPS
- bool
- depends on HAS_DMA
-
-config DMA_NONCOHERENT_OPS
- bool
- depends on HAS_DMA
- select DMA_DIRECT_OPS
-
-config DMA_NONCOHERENT_MMAP
- bool
- depends on DMA_NONCOHERENT_OPS
-
-config DMA_NONCOHERENT_CACHE_SYNC
- bool
- depends on DMA_NONCOHERENT_OPS
-
-config DMA_VIRT_OPS
- bool
- depends on HAS_DMA
-
-config SWIOTLB
- bool
- select DMA_DIRECT_OPS
- select NEED_DMA_MAP_STATE
-
config CHECK_SIGNATURE
bool
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 3d35d062970d..befb127507c0 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -5,7 +5,8 @@ if HAVE_ARCH_KASAN
config KASAN
bool "KASan: runtime memory debugger"
- depends on SLUB || (SLAB && !DEBUG_SLAB)
+ depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB)
+ select SLUB_DEBUG if SLUB
select CONSTRUCTORS
select STACKDEPOT
help
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 19d42ea75ec2..98fa559ebd80 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -1,9 +1,6 @@
config ARCH_HAS_UBSAN_SANITIZE_ALL
bool
-config ARCH_WANTS_UBSAN_NO_NULL
- def_bool n
-
config UBSAN
bool "Undefined behaviour sanity checker"
help
@@ -39,14 +36,6 @@ config UBSAN_ALIGNMENT
Enabling this option on architectures that support unaligned
accesses may produce a lot of false positives.
-config UBSAN_NULL
- bool "Enable checking of null pointers"
- depends on UBSAN
- default y if !ARCH_WANTS_UBSAN_NO_NULL
- help
- This option enables detection of memory accesses via a
- null pointer.
-
config TEST_UBSAN
tristate "Module for testing for undefined behavior detection"
depends on m && UBSAN
diff --git a/lib/Makefile b/lib/Makefile
index 956b320292fe..90dc5520b784 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -23,15 +23,12 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
sha1.o chacha20.o irq_regs.o argv_split.o \
flex_proportions.o ratelimit.o show_mem.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
- earlycpio.o seq_buf.o siphash.o \
+ earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
nmi_backtrace.o nodemask.o win_minmax.o
lib-$(CONFIG_PRINTK) += dump_stack.o
lib-$(CONFIG_MMU) += ioremap.o
lib-$(CONFIG_SMP) += cpumask.o
-lib-$(CONFIG_DMA_DIRECT_OPS) += dma-direct.o
-lib-$(CONFIG_DMA_NONCOHERENT_OPS) += dma-noncoherent.o
-lib-$(CONFIG_DMA_VIRT_OPS) += dma-virt.o
lib-y += kobject.o klist.o
obj-y += lockref.o
@@ -98,10 +95,6 @@ obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o
obj-$(CONFIG_DEBUG_LIST) += list_debug.o
obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o
-ifneq ($(CONFIG_HAVE_DEC_LOCK),y)
- lib-y += dec_and_lock.o
-endif
-
obj-$(CONFIG_BITREVERSE) += bitrev.o
obj-$(CONFIG_RATIONAL) += rational.o
obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o
@@ -148,7 +141,6 @@ obj-$(CONFIG_SMP) += percpu_counter.o
obj-$(CONFIG_AUDIT_GENERIC) += audit.o
obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o
-obj-$(CONFIG_SWIOTLB) += swiotlb.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
@@ -169,8 +161,6 @@ obj-$(CONFIG_NLATTR) += nlattr.o
obj-$(CONFIG_LRU_CACHE) += lru_cache.o
-obj-$(CONFIG_DMA_API_DEBUG) += dma-debug.o
-
obj-$(CONFIG_GENERIC_CSUM) += checksum.o
obj-$(CONFIG_GENERIC_ATOMIC64) += atomic64.o
diff --git a/lib/dec_and_lock.c b/lib/dec_and_lock.c
index 347fa7ac2e8a..9555b68bb774 100644
--- a/lib/dec_and_lock.c
+++ b/lib/dec_and_lock.c
@@ -33,3 +33,19 @@ int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
}
EXPORT_SYMBOL(_atomic_dec_and_lock);
+
+int _atomic_dec_and_lock_irqsave(atomic_t *atomic, spinlock_t *lock,
+ unsigned long *flags)
+{
+ /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
+ if (atomic_add_unless(atomic, -1, 1))
+ return 0;
+
+ /* Otherwise do it the slow way */
+ spin_lock_irqsave(lock, *flags);
+ if (atomic_dec_and_test(atomic))
+ return 1;
+ spin_unlock_irqrestore(lock, *flags);
+ return 0;
+}
+EXPORT_SYMBOL(_atomic_dec_and_lock_irqsave);
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
deleted file mode 100644
index c007d25bee09..000000000000
--- a/lib/dma-debug.c
+++ /dev/null
@@ -1,1773 +0,0 @@
-/*
- * Copyright (C) 2008 Advanced Micro Devices, Inc.
- *
- * Author: Joerg Roedel <joerg.roedel@amd.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include <linux/sched/task_stack.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-#include <linux/sched/task.h>
-#include <linux/stacktrace.h>
-#include <linux/dma-debug.h>
-#include <linux/spinlock.h>
-#include <linux/vmalloc.h>
-#include <linux/debugfs.h>
-#include <linux/uaccess.h>
-#include <linux/export.h>
-#include <linux/device.h>
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/ctype.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-
-#include <asm/sections.h>
-
-#define HASH_SIZE 1024ULL
-#define HASH_FN_SHIFT 13
-#define HASH_FN_MASK (HASH_SIZE - 1)
-
-/* allow architectures to override this if absolutely required */
-#ifndef PREALLOC_DMA_DEBUG_ENTRIES
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-#endif
-
-enum {
- dma_debug_single,
- dma_debug_page,
- dma_debug_sg,
- dma_debug_coherent,
- dma_debug_resource,
-};
-
-enum map_err_types {
- MAP_ERR_CHECK_NOT_APPLICABLE,
- MAP_ERR_NOT_CHECKED,
- MAP_ERR_CHECKED,
-};
-
-#define DMA_DEBUG_STACKTRACE_ENTRIES 5
-
-/**
- * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping
- * @list: node on pre-allocated free_entries list
- * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent
- * @type: single, page, sg, coherent
- * @pfn: page frame of the start address
- * @offset: offset of mapping relative to pfn
- * @size: length of the mapping
- * @direction: enum dma_data_direction
- * @sg_call_ents: 'nents' from dma_map_sg
- * @sg_mapped_ents: 'mapped_ents' from dma_map_sg
- * @map_err_type: track whether dma_mapping_error() was checked
- * @stacktrace: support backtraces when a violation is detected
- */
-struct dma_debug_entry {
- struct list_head list;
- struct device *dev;
- int type;
- unsigned long pfn;
- size_t offset;
- u64 dev_addr;
- u64 size;
- int direction;
- int sg_call_ents;
- int sg_mapped_ents;
- enum map_err_types map_err_type;
-#ifdef CONFIG_STACKTRACE
- struct stack_trace stacktrace;
- unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
-#endif
-};
-
-typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
-
-struct hash_bucket {
- struct list_head list;
- spinlock_t lock;
-} ____cacheline_aligned_in_smp;
-
-/* Hash list to save the allocated dma addresses */
-static struct hash_bucket dma_entry_hash[HASH_SIZE];
-/* List of pre-allocated dma_debug_entry's */
-static LIST_HEAD(free_entries);
-/* Lock for the list above */
-static DEFINE_SPINLOCK(free_entries_lock);
-
-/* Global disable flag - will be set in case of an error */
-static bool global_disable __read_mostly;
-
-/* Early initialization disable flag, set at the end of dma_debug_init */
-static bool dma_debug_initialized __read_mostly;
-
-static inline bool dma_debug_disabled(void)
-{
- return global_disable || !dma_debug_initialized;
-}
-
-/* Global error count */
-static u32 error_count;
-
-/* Global error show enable*/
-static u32 show_all_errors __read_mostly;
-/* Number of errors to show */
-static u32 show_num_errors = 1;
-
-static u32 num_free_entries;
-static u32 min_free_entries;
-static u32 nr_total_entries;
-
-/* number of preallocated entries requested by kernel cmdline */
-static u32 nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
-
-/* debugfs dentry's for the stuff above */
-static struct dentry *dma_debug_dent __read_mostly;
-static struct dentry *global_disable_dent __read_mostly;
-static struct dentry *error_count_dent __read_mostly;
-static struct dentry *show_all_errors_dent __read_mostly;
-static struct dentry *show_num_errors_dent __read_mostly;
-static struct dentry *num_free_entries_dent __read_mostly;
-static struct dentry *min_free_entries_dent __read_mostly;
-static struct dentry *filter_dent __read_mostly;
-
-/* per-driver filter related state */
-
-#define NAME_MAX_LEN 64
-
-static char current_driver_name[NAME_MAX_LEN] __read_mostly;
-static struct device_driver *current_driver __read_mostly;
-
-static DEFINE_RWLOCK(driver_name_lock);
-
-static const char *const maperr2str[] = {
- [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable",
- [MAP_ERR_NOT_CHECKED] = "dma map error not checked",
- [MAP_ERR_CHECKED] = "dma map error checked",
-};
-
-static const char *type2name[5] = { "single", "page",
- "scather-gather", "coherent",
- "resource" };
-
-static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
- "DMA_FROM_DEVICE", "DMA_NONE" };
-
-/*
- * The access to some variables in this macro is racy. We can't use atomic_t
- * here because all these variables are exported to debugfs. Some of them even
- * writeable. This is also the reason why a lock won't help much. But anyway,
- * the races are no big deal. Here is why:
- *
- * error_count: the addition is racy, but the worst thing that can happen is
- * that we don't count some errors
- * show_num_errors: the subtraction is racy. Also no big deal because in
- * worst case this will result in one warning more in the
- * system log than the user configured. This variable is
- * writeable via debugfs.
- */
-static inline void dump_entry_trace(struct dma_debug_entry *entry)
-{
-#ifdef CONFIG_STACKTRACE
- if (entry) {
- pr_warning("Mapped at:\n");
- print_stack_trace(&entry->stacktrace, 0);
- }
-#endif
-}
-
-static bool driver_filter(struct device *dev)
-{
- struct device_driver *drv;
- unsigned long flags;
- bool ret;
-
- /* driver filter off */
- if (likely(!current_driver_name[0]))
- return true;
-
- /* driver filter on and initialized */
- if (current_driver && dev && dev->driver == current_driver)
- return true;
-
- /* driver filter on, but we can't filter on a NULL device... */
- if (!dev)
- return false;
-
- if (current_driver || !current_driver_name[0])
- return false;
-
- /* driver filter on but not yet initialized */
- drv = dev->driver;
- if (!drv)
- return false;
-
- /* lock to protect against change of current_driver_name */
- read_lock_irqsave(&driver_name_lock, flags);
-
- ret = false;
- if (drv->name &&
- strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
- current_driver = drv;
- ret = true;
- }
-
- read_unlock_irqrestore(&driver_name_lock, flags);
-
- return ret;
-}
-
-#define err_printk(dev, entry, format, arg...) do { \
- error_count += 1; \
- if (driver_filter(dev) && \
- (show_all_errors || show_num_errors > 0)) { \
- WARN(1, "%s %s: " format, \
- dev ? dev_driver_string(dev) : "NULL", \
- dev ? dev_name(dev) : "NULL", ## arg); \
- dump_entry_trace(entry); \
- } \
- if (!show_all_errors && show_num_errors > 0) \
- show_num_errors -= 1; \
- } while (0);
-
-/*
- * Hash related functions
- *
- * Every DMA-API request is saved into a struct dma_debug_entry. To
- * have quick access to these structs they are stored into a hash.
- */
-static int hash_fn(struct dma_debug_entry *entry)
-{
- /*
- * Hash function is based on the dma address.
- * We use bits 20-27 here as the index into the hash
- */
- return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
-}
-
-/*
- * Request exclusive access to a hash bucket for a given dma_debug_entry.
- */
-static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
- unsigned long *flags)
- __acquires(&dma_entry_hash[idx].lock)
-{
- int idx = hash_fn(entry);
- unsigned long __flags;
-
- spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
- *flags = __flags;
- return &dma_entry_hash[idx];
-}
-
-/*
- * Give up exclusive access to the hash bucket
- */
-static void put_hash_bucket(struct hash_bucket *bucket,
- unsigned long *flags)
- __releases(&bucket->lock)
-{
- unsigned long __flags = *flags;
-
- spin_unlock_irqrestore(&bucket->lock, __flags);
-}
-
-static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
-{
- return ((a->dev_addr == b->dev_addr) &&
- (a->dev == b->dev)) ? true : false;
-}
-
-static bool containing_match(struct dma_debug_entry *a,
- struct dma_debug_entry *b)
-{
- if (a->dev != b->dev)
- return false;
-
- if ((b->dev_addr <= a->dev_addr) &&
- ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
- return true;
-
- return false;
-}
-
-/*
- * Search a given entry in the hash bucket list
- */
-static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
- struct dma_debug_entry *ref,
- match_fn match)
-{
- struct dma_debug_entry *entry, *ret = NULL;
- int matches = 0, match_lvl, last_lvl = -1;
-
- list_for_each_entry(entry, &bucket->list, list) {
- if (!match(ref, entry))
- continue;
-
- /*
- * Some drivers map the same physical address multiple
- * times. Without a hardware IOMMU this results in the
- * same device addresses being put into the dma-debug
- * hash multiple times too. This can result in false
- * positives being reported. Therefore we implement a
- * best-fit algorithm here which returns the entry from
- * the hash which fits best to the reference value
- * instead of the first-fit.
- */
- matches += 1;
- match_lvl = 0;
- entry->size == ref->size ? ++match_lvl : 0;
- entry->type == ref->type ? ++match_lvl : 0;
- entry->direction == ref->direction ? ++match_lvl : 0;
- entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
-
- if (match_lvl == 4) {
- /* perfect-fit - return the result */
- return entry;
- } else if (match_lvl > last_lvl) {
- /*
- * We found an entry that fits better then the
- * previous one or it is the 1st match.
- */
- last_lvl = match_lvl;
- ret = entry;
- }
- }
-
- /*
- * If we have multiple matches but no perfect-fit, just return
- * NULL.
- */
- ret = (matches == 1) ? ret : NULL;
-
- return ret;
-}
-
-static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
- struct dma_debug_entry *ref)
-{
- return __hash_bucket_find(bucket, ref, exact_match);
-}
-
-static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
- struct dma_debug_entry *ref,
- unsigned long *flags)
-{
-
- unsigned int max_range = dma_get_max_seg_size(ref->dev);
- struct dma_debug_entry *entry, index = *ref;
- unsigned int range = 0;
-
- while (range <= max_range) {
- entry = __hash_bucket_find(*bucket, ref, containing_match);
-
- if (entry)
- return entry;
-
- /*
- * Nothing found, go back a hash bucket
- */
- put_hash_bucket(*bucket, flags);
- range += (1 << HASH_FN_SHIFT);
- index.dev_addr -= (1 << HASH_FN_SHIFT);
- *bucket = get_hash_bucket(&index, flags);
- }
-
- return NULL;
-}
-
-/*
- * Add an entry to a hash bucket
- */
-static void hash_bucket_add(struct hash_bucket *bucket,
- struct dma_debug_entry *entry)
-{
- list_add_tail(&entry->list, &bucket->list);
-}
-
-/*
- * Remove entry from a hash bucket list
- */
-static void hash_bucket_del(struct dma_debug_entry *entry)
-{
- list_del(&entry->list);
-}
-
-static unsigned long long phys_addr(struct dma_debug_entry *entry)
-{
- if (entry->type == dma_debug_resource)
- return __pfn_to_phys(entry->pfn) + entry->offset;
-
- return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
-}
-
-/*
- * Dump mapping entries for debugging purposes
- */
-void debug_dma_dump_mappings(struct device *dev)
-{
- int idx;
-
- for (idx = 0; idx < HASH_SIZE; idx++) {
- struct hash_bucket *bucket = &dma_entry_hash[idx];
- struct dma_debug_entry *entry;
- unsigned long flags;
-
- spin_lock_irqsave(&bucket->lock, flags);
-
- list_for_each_entry(entry, &bucket->list, list) {
- if (!dev || dev == entry->dev) {
- dev_info(entry->dev,
- "%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s\n",
- type2name[entry->type], idx,
- phys_addr(entry), entry->pfn,
- entry->dev_addr, entry->size,
- dir2name[entry->direction],
- maperr2str[entry->map_err_type]);
- }
- }
-
- spin_unlock_irqrestore(&bucket->lock, flags);
- }
-}
-
-/*
- * For each mapping (initial cacheline in the case of
- * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a
- * scatterlist, or the cacheline specified in dma_map_single) insert
- * into this tree using the cacheline as the key. At
- * dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If
- * the entry already exists at insertion time add a tag as a reference
- * count for the overlapping mappings. For now, the overlap tracking
- * just ensures that 'unmaps' balance 'maps' before marking the
- * cacheline idle, but we should also be flagging overlaps as an API
- * violation.
- *
- * Memory usage is mostly constrained by the maximum number of available
- * dma-debug entries in that we need a free dma_debug_entry before
- * inserting into the tree. In the case of dma_map_page and
- * dma_alloc_coherent there is only one dma_debug_entry and one
- * dma_active_cacheline entry to track per event. dma_map_sg(), on the
- * other hand, consumes a single dma_debug_entry, but inserts 'nents'
- * entries into the tree.
- *
- * At any time debug_dma_assert_idle() can be called to trigger a
- * warning if any cachelines in the given page are in the active set.
- */
-static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
-static DEFINE_SPINLOCK(radix_lock);
-#define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
-#define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT)
-#define CACHELINES_PER_PAGE (1 << CACHELINE_PER_PAGE_SHIFT)
-
-static phys_addr_t to_cacheline_number(struct dma_debug_entry *entry)
-{
- return (entry->pfn << CACHELINE_PER_PAGE_SHIFT) +
- (entry->offset >> L1_CACHE_SHIFT);
-}
-
-static int active_cacheline_read_overlap(phys_addr_t cln)
-{
- int overlap = 0, i;
-
- for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
- if (radix_tree_tag_get(&dma_active_cacheline, cln, i))
- overlap |= 1 << i;
- return overlap;
-}
-
-static int active_cacheline_set_overlap(phys_addr_t cln, int overlap)
-{
- int i;
-
- if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0)
- return overlap;
-
- for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
- if (overlap & 1 << i)
- radix_tree_tag_set(&dma_active_cacheline, cln, i);
- else
- radix_tree_tag_clear(&dma_active_cacheline, cln, i);
-
- return overlap;
-}
-
-static void active_cacheline_inc_overlap(phys_addr_t cln)
-{
- int overlap = active_cacheline_read_overlap(cln);
-
- overlap = active_cacheline_set_overlap(cln, ++overlap);
-
- /* If we overflowed the overlap counter then we're potentially
- * leaking dma-mappings. Otherwise, if maps and unmaps are
- * balanced then this overflow may cause false negatives in
- * debug_dma_assert_idle() as the cacheline may be marked idle
- * prematurely.
- */
- WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP,
- "DMA-API: exceeded %d overlapping mappings of cacheline %pa\n",
- ACTIVE_CACHELINE_MAX_OVERLAP, &cln);
-}
-
-static int active_cacheline_dec_overlap(phys_addr_t cln)
-{
- int overlap = active_cacheline_read_overlap(cln);
-
- return active_cacheline_set_overlap(cln, --overlap);
-}
-
-static int active_cacheline_insert(struct dma_debug_entry *entry)
-{
- phys_addr_t cln = to_cacheline_number(entry);
- unsigned long flags;
- int rc;
-
- /* If the device is not writing memory then we don't have any
- * concerns about the cpu consuming stale data. This mitigates
- * legitimate usages of overlapping mappings.
- */
- if (entry->direction == DMA_TO_DEVICE)
- return 0;
-
- spin_lock_irqsave(&radix_lock, flags);
- rc = radix_tree_insert(&dma_active_cacheline, cln, entry);
- if (rc == -EEXIST)
- active_cacheline_inc_overlap(cln);
- spin_unlock_irqrestore(&radix_lock, flags);
-
- return rc;
-}
-
-static void active_cacheline_remove(struct dma_debug_entry *entry)
-{
- phys_addr_t cln = to_cacheline_number(entry);
- unsigned long flags;
-
- /* ...mirror the insert case */
- if (entry->direction == DMA_TO_DEVICE)
- return;
-
- spin_lock_irqsave(&radix_lock, flags);
- /* since we are counting overlaps the final put of the
- * cacheline will occur when the overlap count is 0.
- * active_cacheline_dec_overlap() returns -1 in that case
- */
- if (active_cacheline_dec_overlap(cln) < 0)
- radix_tree_delete(&dma_active_cacheline, cln);
- spin_unlock_irqrestore(&radix_lock, flags);
-}
-
-/**
- * debug_dma_assert_idle() - assert that a page is not undergoing dma
- * @page: page to lookup in the dma_active_cacheline tree
- *
- * Place a call to this routine in cases where the cpu touching the page
- * before the dma completes (page is dma_unmapped) will lead to data
- * corruption.
- */
-void debug_dma_assert_idle(struct page *page)
-{
- static struct dma_debug_entry *ents[CACHELINES_PER_PAGE];
- struct dma_debug_entry *entry = NULL;
- void **results = (void **) &ents;
- unsigned int nents, i;
- unsigned long flags;
- phys_addr_t cln;
-
- if (dma_debug_disabled())
- return;
-
- if (!page)
- return;
-
- cln = (phys_addr_t) page_to_pfn(page) << CACHELINE_PER_PAGE_SHIFT;
- spin_lock_irqsave(&radix_lock, flags);
- nents = radix_tree_gang_lookup(&dma_active_cacheline, results, cln,
- CACHELINES_PER_PAGE);
- for (i = 0; i < nents; i++) {
- phys_addr_t ent_cln = to_cacheline_number(ents[i]);
-
- if (ent_cln == cln) {
- entry = ents[i];
- break;
- } else if (ent_cln >= cln + CACHELINES_PER_PAGE)
- break;
- }
- spin_unlock_irqrestore(&radix_lock, flags);
-
- if (!entry)
- return;
-
- cln = to_cacheline_number(entry);
- err_printk(entry->dev, entry,
- "DMA-API: cpu touching an active dma mapped cacheline [cln=%pa]\n",
- &cln);
-}
-
-/*
- * Wrapper function for adding an entry to the hash.
- * This function takes care of locking itself.
- */
-static void add_dma_entry(struct dma_debug_entry *entry)
-{
- struct hash_bucket *bucket;
- unsigned long flags;
- int rc;
-
- bucket = get_hash_bucket(entry, &flags);
- hash_bucket_add(bucket, entry);
- put_hash_bucket(bucket, &flags);
-
- rc = active_cacheline_insert(entry);
- if (rc == -ENOMEM) {
- pr_err("DMA-API: cacheline tracking ENOMEM, dma-debug disabled\n");
- global_disable = true;
- }
-
- /* TODO: report -EEXIST errors here as overlapping mappings are
- * not supported by the DMA API
- */
-}
-
-static struct dma_debug_entry *__dma_entry_alloc(void)
-{
- struct dma_debug_entry *entry;
-
- entry = list_entry(free_entries.next, struct dma_debug_entry, list);
- list_del(&entry->list);
- memset(entry, 0, sizeof(*entry));
-
- num_free_entries -= 1;
- if (num_free_entries < min_free_entries)
- min_free_entries = num_free_entries;
-
- return entry;
-}
-
-/* struct dma_entry allocator
- *
- * The next two functions implement the allocator for
- * struct dma_debug_entries.
- */
-static struct dma_debug_entry *dma_entry_alloc(void)
-{
- struct dma_debug_entry *entry;
- unsigned long flags;
-
- spin_lock_irqsave(&free_entries_lock, flags);
-
- if (list_empty(&free_entries)) {
- global_disable = true;
- spin_unlock_irqrestore(&free_entries_lock, flags);
- pr_err("DMA-API: debugging out of memory - disabling\n");
- return NULL;
- }
-
- entry = __dma_entry_alloc();
-
- spin_unlock_irqrestore(&free_entries_lock, flags);
-
-#ifdef CONFIG_STACKTRACE
- entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
- entry->stacktrace.entries = entry->st_entries;
- entry->stacktrace.skip = 2;
- save_stack_trace(&entry->stacktrace);
-#endif
-
- return entry;
-}
-
-static void dma_entry_free(struct dma_debug_entry *entry)
-{
- unsigned long flags;
-
- active_cacheline_remove(entry);
-
- /*
- * add to beginning of the list - this way the entries are
- * more likely cache hot when they are reallocated.
- */
- spin_lock_irqsave(&free_entries_lock, flags);
- list_add(&entry->list, &free_entries);
- num_free_entries += 1;
- spin_unlock_irqrestore(&free_entries_lock, flags);
-}
-
-int dma_debug_resize_entries(u32 num_entries)
-{
- int i, delta, ret = 0;
- unsigned long flags;
- struct dma_debug_entry *entry;
- LIST_HEAD(tmp);
-
- spin_lock_irqsave(&free_entries_lock, flags);
-
- if (nr_total_entries < num_entries) {
- delta = num_entries - nr_total_entries;
-
- spin_unlock_irqrestore(&free_entries_lock, flags);
-
- for (i = 0; i < delta; i++) {
- entry = kzalloc(sizeof(*entry), GFP_KERNEL);
- if (!entry)
- break;
-
- list_add_tail(&entry->list, &tmp);
- }
-
- spin_lock_irqsave(&free_entries_lock, flags);
-
- list_splice(&tmp, &free_entries);
- nr_total_entries += i;
- num_free_entries += i;
- } else {
- delta = nr_total_entries - num_entries;
-
- for (i = 0; i < delta && !list_empty(&free_entries); i++) {
- entry = __dma_entry_alloc();
- kfree(entry);
- }
-
- nr_total_entries -= i;
- }
-
- if (nr_total_entries != num_entries)
- ret = 1;
-
- spin_unlock_irqrestore(&free_entries_lock, flags);
-
- return ret;
-}
-
-/*
- * DMA-API debugging init code
- *
- * The init code does two things:
- * 1. Initialize core data structures
- * 2. Preallocate a given number of dma_debug_entry structs
- */
-
-static int prealloc_memory(u32 num_entries)
-{
- struct dma_debug_entry *entry, *next_entry;
- int i;
-
- for (i = 0; i < num_entries; ++i) {
- entry = kzalloc(sizeof(*entry), GFP_KERNEL);
- if (!entry)
- goto out_err;
-
- list_add_tail(&entry->list, &free_entries);
- }
-
- num_free_entries = num_entries;
- min_free_entries = num_entries;
-
- pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
-
- return 0;
-
-out_err:
-
- list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
- list_del(&entry->list);
- kfree(entry);
- }
-
- return -ENOMEM;
-}
-
-static ssize_t filter_read(struct file *file, char __user *user_buf,
- size_t count, loff_t *ppos)
-{
- char buf[NAME_MAX_LEN + 1];
- unsigned long flags;
- int len;
-
- if (!current_driver_name[0])
- return 0;
-
- /*
- * We can't copy to userspace directly because current_driver_name can
- * only be read under the driver_name_lock with irqs disabled. So
- * create a temporary copy first.
- */
- read_lock_irqsave(&driver_name_lock, flags);
- len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
- read_unlock_irqrestore(&driver_name_lock, flags);
-
- return simple_read_from_buffer(user_buf, count, ppos, buf, len);
-}
-
-static ssize_t filter_write(struct file *file, const char __user *userbuf,
- size_t count, loff_t *ppos)
-{
- char buf[NAME_MAX_LEN];
- unsigned long flags;
- size_t len;
- int i;
-
- /*
- * We can't copy from userspace directly. Access to
- * current_driver_name is protected with a write_lock with irqs
- * disabled. Since copy_from_user can fault and may sleep we
- * need to copy to temporary buffer first
- */
- len = min(count, (size_t)(NAME_MAX_LEN - 1));
- if (copy_from_user(buf, userbuf, len))
- return -EFAULT;
-
- buf[len] = 0;
-
- write_lock_irqsave(&driver_name_lock, flags);
-
- /*
- * Now handle the string we got from userspace very carefully.
- * The rules are:
- * - only use the first token we got
- * - token delimiter is everything looking like a space
- * character (' ', '\n', '\t' ...)
- *
- */
- if (!isalnum(buf[0])) {
- /*
- * If the first character userspace gave us is not
- * alphanumerical then assume the filter should be
- * switched off.
- */
- if (current_driver_name[0])
- pr_info("DMA-API: switching off dma-debug driver filter\n");
- current_driver_name[0] = 0;
- current_driver = NULL;
- goto out_unlock;
- }
-
- /*
- * Now parse out the first token and use it as the name for the
- * driver to filter for.
- */
- for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
- current_driver_name[i] = buf[i];
- if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
- break;
- }
- current_driver_name[i] = 0;
- current_driver = NULL;
-
- pr_info("DMA-API: enable driver filter for driver [%s]\n",
- current_driver_name);
-
-out_unlock:
- write_unlock_irqrestore(&driver_name_lock, flags);
-
- return count;
-}
-
-static const struct file_operations filter_fops = {
- .read = filter_read,
- .write = filter_write,
- .llseek = default_llseek,
-};
-
-static int dma_debug_fs_init(void)
-{
- dma_debug_dent = debugfs_create_dir("dma-api", NULL);
- if (!dma_debug_dent) {
- pr_err("DMA-API: can not create debugfs directory\n");
- return -ENOMEM;
- }
-
- global_disable_dent = debugfs_create_bool("disabled", 0444,
- dma_debug_dent,
- &global_disable);
- if (!global_disable_dent)
- goto out_err;
-
- error_count_dent = debugfs_create_u32("error_count", 0444,
- dma_debug_dent, &error_count);
- if (!error_count_dent)
- goto out_err;
-
- show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
- dma_debug_dent,
- &show_all_errors);
- if (!show_all_errors_dent)
- goto out_err;
-
- show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
- dma_debug_dent,
- &show_num_errors);
- if (!show_num_errors_dent)
- goto out_err;
-
- num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
- dma_debug_dent,
- &num_free_entries);
- if (!num_free_entries_dent)
- goto out_err;
-
- min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
- dma_debug_dent,
- &min_free_entries);
- if (!min_free_entries_dent)
- goto out_err;
-
- filter_dent = debugfs_create_file("driver_filter", 0644,
- dma_debug_dent, NULL, &filter_fops);
- if (!filter_dent)
- goto out_err;
-
- return 0;
-
-out_err:
- debugfs_remove_recursive(dma_debug_dent);
-
- return -ENOMEM;
-}
-
-static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
-{
- struct dma_debug_entry *entry;
- unsigned long flags;
- int count = 0, i;
-
- for (i = 0; i < HASH_SIZE; ++i) {
- spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
- list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
- if (entry->dev == dev) {
- count += 1;
- *out_entry = entry;
- }
- }
- spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
- }
-
- return count;
-}
-
-static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
-{
- struct device *dev = data;
- struct dma_debug_entry *uninitialized_var(entry);
- int count;
-
- if (dma_debug_disabled())
- return 0;
-
- switch (action) {
- case BUS_NOTIFY_UNBOUND_DRIVER:
- count = device_dma_allocations(dev, &entry);
- if (count == 0)
- break;
- err_printk(dev, entry, "DMA-API: device driver has pending "
- "DMA allocations while released from device "
- "[count=%d]\n"
- "One of leaked entries details: "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [mapped as %s]\n",
- count, entry->dev_addr, entry->size,
- dir2name[entry->direction], type2name[entry->type]);
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-void dma_debug_add_bus(struct bus_type *bus)
-{
- struct notifier_block *nb;
-
- if (dma_debug_disabled())
- return;
-
- nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
- if (nb == NULL) {
- pr_err("dma_debug_add_bus: out of memory\n");
- return;
- }
-
- nb->notifier_call = dma_debug_device_change;
-
- bus_register_notifier(bus, nb);
-}
-
-static int dma_debug_init(void)
-{
- int i;
-
- /* Do not use dma_debug_initialized here, since we really want to be
- * called to set dma_debug_initialized
- */
- if (global_disable)
- return 0;
-
- for (i = 0; i < HASH_SIZE; ++i) {
- INIT_LIST_HEAD(&dma_entry_hash[i].list);
- spin_lock_init(&dma_entry_hash[i].lock);
- }
-
- if (dma_debug_fs_init() != 0) {
- pr_err("DMA-API: error creating debugfs entries - disabling\n");
- global_disable = true;
-
- return 0;
- }
-
- if (prealloc_memory(nr_prealloc_entries) != 0) {
- pr_err("DMA-API: debugging out of memory error - disabled\n");
- global_disable = true;
-
- return 0;
- }
-
- nr_total_entries = num_free_entries;
-
- dma_debug_initialized = true;
-
- pr_info("DMA-API: debugging enabled by kernel config\n");
- return 0;
-}
-core_initcall(dma_debug_init);
-
-static __init int dma_debug_cmdline(char *str)
-{
- if (!str)
- return -EINVAL;
-
- if (strncmp(str, "off", 3) == 0) {
- pr_info("DMA-API: debugging disabled on kernel command line\n");
- global_disable = true;
- }
-
- return 0;
-}
-
-static __init int dma_debug_entries_cmdline(char *str)
-{
- if (!str)
- return -EINVAL;
- if (!get_option(&str, &nr_prealloc_entries))
- nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
- return 0;
-}
-
-__setup("dma_debug=", dma_debug_cmdline);
-__setup("dma_debug_entries=", dma_debug_entries_cmdline);
-
-static void check_unmap(struct dma_debug_entry *ref)
-{
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
-
- bucket = get_hash_bucket(ref, &flags);
- entry = bucket_find_exact(bucket, ref);
-
- if (!entry) {
- /* must drop lock before calling dma_mapping_error */
- put_hash_bucket(bucket, &flags);
-
- if (dma_mapping_error(ref->dev, ref->dev_addr)) {
- err_printk(ref->dev, NULL,
- "DMA-API: device driver tries to free an "
- "invalid DMA memory address\n");
- } else {
- err_printk(ref->dev, NULL,
- "DMA-API: device driver tries to free DMA "
- "memory it has not allocated [device "
- "address=0x%016llx] [size=%llu bytes]\n",
- ref->dev_addr, ref->size);
- }
- return;
- }
-
- if (ref->size != entry->size) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with different size "
- "[device address=0x%016llx] [map size=%llu bytes] "
- "[unmap size=%llu bytes]\n",
- ref->dev_addr, entry->size, ref->size);
- }
-
- if (ref->type != entry->type) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with wrong function "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped as %s] [unmapped as %s]\n",
- ref->dev_addr, ref->size,
- type2name[entry->type], type2name[ref->type]);
- } else if ((entry->type == dma_debug_coherent) &&
- (phys_addr(ref) != phys_addr(entry))) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with different CPU address "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[cpu alloc address=0x%016llx] "
- "[cpu free address=0x%016llx]",
- ref->dev_addr, ref->size,
- phys_addr(entry),
- phys_addr(ref));
- }
-
- if (ref->sg_call_ents && ref->type == dma_debug_sg &&
- ref->sg_call_ents != entry->sg_call_ents) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA sg list with different entry count "
- "[map count=%d] [unmap count=%d]\n",
- entry->sg_call_ents, ref->sg_call_ents);
- }
-
- /*
- * This may be no bug in reality - but most implementations of the
- * DMA API don't handle this properly, so check for it here
- */
- if (ref->direction != entry->direction) {
- err_printk(ref->dev, entry, "DMA-API: device driver frees "
- "DMA memory with different direction "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [unmapped with %s]\n",
- ref->dev_addr, ref->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
- }
-
- /*
- * Drivers should use dma_mapping_error() to check the returned
- * addresses of dma_map_single() and dma_map_page().
- * If not, print this warning message. See Documentation/DMA-API.txt.
- */
- if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
- err_printk(ref->dev, entry,
- "DMA-API: device driver failed to check map error"
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped as %s]",
- ref->dev_addr, ref->size,
- type2name[entry->type]);
- }
-
- hash_bucket_del(entry);
- dma_entry_free(entry);
-
- put_hash_bucket(bucket, &flags);
-}
-
-static void check_for_stack(struct device *dev,
- struct page *page, size_t offset)
-{
- void *addr;
- struct vm_struct *stack_vm_area = task_stack_vm_area(current);
-
- if (!stack_vm_area) {
- /* Stack is direct-mapped. */
- if (PageHighMem(page))
- return;
- addr = page_address(page) + offset;
- if (object_is_on_stack(addr))
- err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [addr=%p]\n", addr);
- } else {
- /* Stack is vmalloced. */
- int i;
-
- for (i = 0; i < stack_vm_area->nr_pages; i++) {
- if (page != stack_vm_area->pages[i])
- continue;
-
- addr = (u8 *)current->stack + i * PAGE_SIZE + offset;
- err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [probable addr=%p]\n", addr);
- break;
- }
- }
-}
-
-static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
-{
- unsigned long a1 = (unsigned long)addr;
- unsigned long b1 = a1 + len;
- unsigned long a2 = (unsigned long)start;
- unsigned long b2 = (unsigned long)end;
-
- return !(b1 <= a2 || a1 >= b2);
-}
-
-static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
-{
- if (overlap(addr, len, _stext, _etext) ||
- overlap(addr, len, __start_rodata, __end_rodata))
- err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
-}
-
-static void check_sync(struct device *dev,
- struct dma_debug_entry *ref,
- bool to_cpu)
-{
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
-
- bucket = get_hash_bucket(ref, &flags);
-
- entry = bucket_find_contain(&bucket, ref, &flags);
-
- if (!entry) {
- err_printk(dev, NULL, "DMA-API: device driver tries "
- "to sync DMA memory it has not allocated "
- "[device address=0x%016llx] [size=%llu bytes]\n",
- (unsigned long long)ref->dev_addr, ref->size);
- goto out;
- }
-
- if (ref->size > entry->size) {
- err_printk(dev, entry, "DMA-API: device driver syncs"
- " DMA memory outside allocated range "
- "[device address=0x%016llx] "
- "[allocation size=%llu bytes] "
- "[sync offset+size=%llu]\n",
- entry->dev_addr, entry->size,
- ref->size);
- }
-
- if (entry->direction == DMA_BIDIRECTIONAL)
- goto out;
-
- if (ref->direction != entry->direction) {
- err_printk(dev, entry, "DMA-API: device driver syncs "
- "DMA memory with different direction "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [synced with %s]\n",
- (unsigned long long)ref->dev_addr, entry->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
- }
-
- if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
- !(ref->direction == DMA_TO_DEVICE))
- err_printk(dev, entry, "DMA-API: device driver syncs "
- "device read-only DMA memory for cpu "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [synced with %s]\n",
- (unsigned long long)ref->dev_addr, entry->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
-
- if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
- !(ref->direction == DMA_FROM_DEVICE))
- err_printk(dev, entry, "DMA-API: device driver syncs "
- "device write-only DMA memory to device "
- "[device address=0x%016llx] [size=%llu bytes] "
- "[mapped with %s] [synced with %s]\n",
- (unsigned long long)ref->dev_addr, entry->size,
- dir2name[entry->direction],
- dir2name[ref->direction]);
-
- if (ref->sg_call_ents && ref->type == dma_debug_sg &&
- ref->sg_call_ents != entry->sg_call_ents) {
- err_printk(ref->dev, entry, "DMA-API: device driver syncs "
- "DMA sg list with different entry count "
- "[map count=%d] [sync count=%d]\n",
- entry->sg_call_ents, ref->sg_call_ents);
- }
-
-out:
- put_hash_bucket(bucket, &flags);
-}
-
-static void check_sg_segment(struct device *dev, struct scatterlist *sg)
-{
-#ifdef CONFIG_DMA_API_DEBUG_SG
- unsigned int max_seg = dma_get_max_seg_size(dev);
- u64 start, end, boundary = dma_get_seg_boundary(dev);
-
- /*
- * Either the driver forgot to set dma_parms appropriately, or
- * whoever generated the list forgot to check them.
- */
- if (sg->length > max_seg)
- err_printk(dev, NULL, "DMA-API: mapping sg segment longer than device claims to support [len=%u] [max=%u]\n",
- sg->length, max_seg);
- /*
- * In some cases this could potentially be the DMA API
- * implementation's fault, but it would usually imply that
- * the scatterlist was built inappropriately to begin with.
- */
- start = sg_dma_address(sg);
- end = start + sg_dma_len(sg) - 1;
- if ((start ^ end) & ~boundary)
- err_printk(dev, NULL, "DMA-API: mapping sg segment across boundary [start=0x%016llx] [end=0x%016llx] [boundary=0x%016llx]\n",
- start, end, boundary);
-#endif
-}
-
-void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
- size_t size, int direction, dma_addr_t dma_addr,
- bool map_single)
-{
- struct dma_debug_entry *entry;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- if (dma_mapping_error(dev, dma_addr))
- return;
-
- entry = dma_entry_alloc();
- if (!entry)
- return;
-
- entry->dev = dev;
- entry->type = dma_debug_page;
- entry->pfn = page_to_pfn(page);
- entry->offset = offset,
- entry->dev_addr = dma_addr;
- entry->size = size;
- entry->direction = direction;
- entry->map_err_type = MAP_ERR_NOT_CHECKED;
-
- if (map_single)
- entry->type = dma_debug_single;
-
- check_for_stack(dev, page, offset);
-
- if (!PageHighMem(page)) {
- void *addr = page_address(page) + offset;
-
- check_for_illegal_area(dev, addr, size);
- }
-
- add_dma_entry(entry);
-}
-EXPORT_SYMBOL(debug_dma_map_page);
-
-void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- struct dma_debug_entry ref;
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- ref.dev = dev;
- ref.dev_addr = dma_addr;
- bucket = get_hash_bucket(&ref, &flags);
-
- list_for_each_entry(entry, &bucket->list, list) {
- if (!exact_match(&ref, entry))
- continue;
-
- /*
- * The same physical address can be mapped multiple
- * times. Without a hardware IOMMU this results in the
- * same device addresses being put into the dma-debug
- * hash multiple times too. This can result in false
- * positives being reported. Therefore we implement a
- * best-fit algorithm here which updates the first entry
- * from the hash which fits the reference value and is
- * not currently listed as being checked.
- */
- if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
- entry->map_err_type = MAP_ERR_CHECKED;
- break;
- }
- }
-
- put_hash_bucket(bucket, &flags);
-}
-EXPORT_SYMBOL(debug_dma_mapping_error);
-
-void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
- size_t size, int direction, bool map_single)
-{
- struct dma_debug_entry ref = {
- .type = dma_debug_page,
- .dev = dev,
- .dev_addr = addr,
- .size = size,
- .direction = direction,
- };
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- if (map_single)
- ref.type = dma_debug_single;
-
- check_unmap(&ref);
-}
-EXPORT_SYMBOL(debug_dma_unmap_page);
-
-void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, int mapped_ents, int direction)
-{
- struct dma_debug_entry *entry;
- struct scatterlist *s;
- int i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sg, s, mapped_ents, i) {
- entry = dma_entry_alloc();
- if (!entry)
- return;
-
- entry->type = dma_debug_sg;
- entry->dev = dev;
- entry->pfn = page_to_pfn(sg_page(s));
- entry->offset = s->offset,
- entry->size = sg_dma_len(s);
- entry->dev_addr = sg_dma_address(s);
- entry->direction = direction;
- entry->sg_call_ents = nents;
- entry->sg_mapped_ents = mapped_ents;
-
- check_for_stack(dev, sg_page(s), s->offset);
-
- if (!PageHighMem(sg_page(s))) {
- check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
- }
-
- check_sg_segment(dev, s);
-
- add_dma_entry(entry);
- }
-}
-EXPORT_SYMBOL(debug_dma_map_sg);
-
-static int get_nr_mapped_entries(struct device *dev,
- struct dma_debug_entry *ref)
-{
- struct dma_debug_entry *entry;
- struct hash_bucket *bucket;
- unsigned long flags;
- int mapped_ents;
-
- bucket = get_hash_bucket(ref, &flags);
- entry = bucket_find_exact(bucket, ref);
- mapped_ents = 0;
-
- if (entry)
- mapped_ents = entry->sg_mapped_ents;
- put_hash_bucket(bucket, &flags);
-
- return mapped_ents;
-}
-
-void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
- int nelems, int dir)
-{
- struct scatterlist *s;
- int mapped_ents = 0, i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sglist, s, nelems, i) {
-
- struct dma_debug_entry ref = {
- .type = dma_debug_sg,
- .dev = dev,
- .pfn = page_to_pfn(sg_page(s)),
- .offset = s->offset,
- .dev_addr = sg_dma_address(s),
- .size = sg_dma_len(s),
- .direction = dir,
- .sg_call_ents = nelems,
- };
-
- if (mapped_ents && i >= mapped_ents)
- break;
-
- if (!i)
- mapped_ents = get_nr_mapped_entries(dev, &ref);
-
- check_unmap(&ref);
- }
-}
-EXPORT_SYMBOL(debug_dma_unmap_sg);
-
-void debug_dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t dma_addr, void *virt)
-{
- struct dma_debug_entry *entry;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- if (unlikely(virt == NULL))
- return;
-
- /* handle vmalloc and linear addresses */
- if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
- return;
-
- entry = dma_entry_alloc();
- if (!entry)
- return;
-
- entry->type = dma_debug_coherent;
- entry->dev = dev;
- entry->offset = offset_in_page(virt);
- entry->size = size;
- entry->dev_addr = dma_addr;
- entry->direction = DMA_BIDIRECTIONAL;
-
- if (is_vmalloc_addr(virt))
- entry->pfn = vmalloc_to_pfn(virt);
- else
- entry->pfn = page_to_pfn(virt_to_page(virt));
-
- add_dma_entry(entry);
-}
-EXPORT_SYMBOL(debug_dma_alloc_coherent);
-
-void debug_dma_free_coherent(struct device *dev, size_t size,
- void *virt, dma_addr_t addr)
-{
- struct dma_debug_entry ref = {
- .type = dma_debug_coherent,
- .dev = dev,
- .offset = offset_in_page(virt),
- .dev_addr = addr,
- .size = size,
- .direction = DMA_BIDIRECTIONAL,
- };
-
- /* handle vmalloc and linear addresses */
- if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
- return;
-
- if (is_vmalloc_addr(virt))
- ref.pfn = vmalloc_to_pfn(virt);
- else
- ref.pfn = page_to_pfn(virt_to_page(virt));
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- check_unmap(&ref);
-}
-EXPORT_SYMBOL(debug_dma_free_coherent);
-
-void debug_dma_map_resource(struct device *dev, phys_addr_t addr, size_t size,
- int direction, dma_addr_t dma_addr)
-{
- struct dma_debug_entry *entry;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- entry = dma_entry_alloc();
- if (!entry)
- return;
-
- entry->type = dma_debug_resource;
- entry->dev = dev;
- entry->pfn = PHYS_PFN(addr);
- entry->offset = offset_in_page(addr);
- entry->size = size;
- entry->dev_addr = dma_addr;
- entry->direction = direction;
- entry->map_err_type = MAP_ERR_NOT_CHECKED;
-
- add_dma_entry(entry);
-}
-EXPORT_SYMBOL(debug_dma_map_resource);
-
-void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr,
- size_t size, int direction)
-{
- struct dma_debug_entry ref = {
- .type = dma_debug_resource,
- .dev = dev,
- .dev_addr = dma_addr,
- .size = size,
- .direction = direction,
- };
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- check_unmap(&ref);
-}
-EXPORT_SYMBOL(debug_dma_unmap_resource);
-
-void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
- size_t size, int direction)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- ref.type = dma_debug_single;
- ref.dev = dev;
- ref.dev_addr = dma_handle;
- ref.size = size;
- ref.direction = direction;
- ref.sg_call_ents = 0;
-
- check_sync(dev, &ref, true);
-}
-EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
-
-void debug_dma_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle, size_t size,
- int direction)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- ref.type = dma_debug_single;
- ref.dev = dev;
- ref.dev_addr = dma_handle;
- ref.size = size;
- ref.direction = direction;
- ref.sg_call_ents = 0;
-
- check_sync(dev, &ref, false);
-}
-EXPORT_SYMBOL(debug_dma_sync_single_for_device);
-
-void debug_dma_sync_single_range_for_cpu(struct device *dev,
- dma_addr_t dma_handle,
- unsigned long offset, size_t size,
- int direction)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- ref.type = dma_debug_single;
- ref.dev = dev;
- ref.dev_addr = dma_handle;
- ref.size = offset + size;
- ref.direction = direction;
- ref.sg_call_ents = 0;
-
- check_sync(dev, &ref, true);
-}
-EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
-
-void debug_dma_sync_single_range_for_device(struct device *dev,
- dma_addr_t dma_handle,
- unsigned long offset,
- size_t size, int direction)
-{
- struct dma_debug_entry ref;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- ref.type = dma_debug_single;
- ref.dev = dev;
- ref.dev_addr = dma_handle;
- ref.size = offset + size;
- ref.direction = direction;
- ref.sg_call_ents = 0;
-
- check_sync(dev, &ref, false);
-}
-EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
-
-void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
- int nelems, int direction)
-{
- struct scatterlist *s;
- int mapped_ents = 0, i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sg, s, nelems, i) {
-
- struct dma_debug_entry ref = {
- .type = dma_debug_sg,
- .dev = dev,
- .pfn = page_to_pfn(sg_page(s)),
- .offset = s->offset,
- .dev_addr = sg_dma_address(s),
- .size = sg_dma_len(s),
- .direction = direction,
- .sg_call_ents = nelems,
- };
-
- if (!i)
- mapped_ents = get_nr_mapped_entries(dev, &ref);
-
- if (i >= mapped_ents)
- break;
-
- check_sync(dev, &ref, true);
- }
-}
-EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
-
-void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
- int nelems, int direction)
-{
- struct scatterlist *s;
- int mapped_ents = 0, i;
-
- if (unlikely(dma_debug_disabled()))
- return;
-
- for_each_sg(sg, s, nelems, i) {
-
- struct dma_debug_entry ref = {
- .type = dma_debug_sg,
- .dev = dev,
- .pfn = page_to_pfn(sg_page(s)),
- .offset = s->offset,
- .dev_addr = sg_dma_address(s),
- .size = sg_dma_len(s),
- .direction = direction,
- .sg_call_ents = nelems,
- };
- if (!i)
- mapped_ents = get_nr_mapped_entries(dev, &ref);
-
- if (i >= mapped_ents)
- break;
-
- check_sync(dev, &ref, false);
- }
-}
-EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
-
-static int __init dma_debug_driver_setup(char *str)
-{
- int i;
-
- for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
- current_driver_name[i] = *str;
- if (*str == 0)
- break;
- }
-
- if (current_driver_name[0])
- pr_info("DMA-API: enable driver filter for driver [%s]\n",
- current_driver_name);
-
-
- return 1;
-}
-__setup("dma_debug_driver=", dma_debug_driver_setup);
diff --git a/lib/dma-direct.c b/lib/dma-direct.c
deleted file mode 100644
index 8be8106270c2..000000000000
--- a/lib/dma-direct.c
+++ /dev/null
@@ -1,204 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * DMA operations that map physical memory directly without using an IOMMU or
- * flushing caches.
- */
-#include <linux/export.h>
-#include <linux/mm.h>
-#include <linux/dma-direct.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-contiguous.h>
-#include <linux/pfn.h>
-#include <linux/set_memory.h>
-
-#define DIRECT_MAPPING_ERROR 0
-
-/*
- * Most architectures use ZONE_DMA for the first 16 Megabytes, but
- * some use it for entirely different regions:
- */
-#ifndef ARCH_ZONE_DMA_BITS
-#define ARCH_ZONE_DMA_BITS 24
-#endif
-
-/*
- * For AMD SEV all DMA must be to unencrypted addresses.
- */
-static inline bool force_dma_unencrypted(void)
-{
- return sev_active();
-}
-
-static bool
-check_addr(struct device *dev, dma_addr_t dma_addr, size_t size,
- const char *caller)
-{
- if (unlikely(dev && !dma_capable(dev, dma_addr, size))) {
- if (!dev->dma_mask) {
- dev_err(dev,
- "%s: call on device without dma_mask\n",
- caller);
- return false;
- }
-
- if (*dev->dma_mask >= DMA_BIT_MASK(32)) {
- dev_err(dev,
- "%s: overflow %pad+%zu of device mask %llx\n",
- caller, &dma_addr, size, *dev->dma_mask);
- }
- return false;
- }
- return true;
-}
-
-static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size)
-{
- dma_addr_t addr = force_dma_unencrypted() ?
- __phys_to_dma(dev, phys) : phys_to_dma(dev, phys);
- return addr + size - 1 <= dev->coherent_dma_mask;
-}
-
-void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
- gfp_t gfp, unsigned long attrs)
-{
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- int page_order = get_order(size);
- struct page *page = NULL;
- void *ret;
-
- /* we always manually zero the memory once we are done: */
- gfp &= ~__GFP_ZERO;
-
- /* GFP_DMA32 and GFP_DMA are no ops without the corresponding zones: */
- if (dev->coherent_dma_mask <= DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
- gfp |= GFP_DMA;
- if (dev->coherent_dma_mask <= DMA_BIT_MASK(32) && !(gfp & GFP_DMA))
- gfp |= GFP_DMA32;
-
-again:
- /* CMA can be used only in the context which permits sleeping */
- if (gfpflags_allow_blocking(gfp)) {
- page = dma_alloc_from_contiguous(dev, count, page_order, gfp);
- if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
- dma_release_from_contiguous(dev, page, count);
- page = NULL;
- }
- }
- if (!page)
- page = alloc_pages_node(dev_to_node(dev), gfp, page_order);
-
- if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
- __free_pages(page, page_order);
- page = NULL;
-
- if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
- dev->coherent_dma_mask < DMA_BIT_MASK(64) &&
- !(gfp & (GFP_DMA32 | GFP_DMA))) {
- gfp |= GFP_DMA32;
- goto again;
- }
-
- if (IS_ENABLED(CONFIG_ZONE_DMA) &&
- dev->coherent_dma_mask < DMA_BIT_MASK(32) &&
- !(gfp & GFP_DMA)) {
- gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
- goto again;
- }
- }
-
- if (!page)
- return NULL;
- ret = page_address(page);
- if (force_dma_unencrypted()) {
- set_memory_decrypted((unsigned long)ret, 1 << page_order);
- *dma_handle = __phys_to_dma(dev, page_to_phys(page));
- } else {
- *dma_handle = phys_to_dma(dev, page_to_phys(page));
- }
- memset(ret, 0, size);
- return ret;
-}
-
-/*
- * NOTE: this function must never look at the dma_addr argument, because we want
- * to be able to use it as a helper for iommu implementations as well.
- */
-void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t dma_addr, unsigned long attrs)
-{
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned int page_order = get_order(size);
-
- if (force_dma_unencrypted())
- set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order);
- if (!dma_release_from_contiguous(dev, virt_to_page(cpu_addr), count))
- free_pages((unsigned long)cpu_addr, page_order);
-}
-
-dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- dma_addr_t dma_addr = phys_to_dma(dev, page_to_phys(page)) + offset;
-
- if (!check_addr(dev, dma_addr, size, __func__))
- return DIRECT_MAPPING_ERROR;
- return dma_addr;
-}
-
-int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
- enum dma_data_direction dir, unsigned long attrs)
-{
- int i;
- struct scatterlist *sg;
-
- for_each_sg(sgl, sg, nents, i) {
- BUG_ON(!sg_page(sg));
-
- sg_dma_address(sg) = phys_to_dma(dev, sg_phys(sg));
- if (!check_addr(dev, sg_dma_address(sg), sg->length, __func__))
- return 0;
- sg_dma_len(sg) = sg->length;
- }
-
- return nents;
-}
-
-int dma_direct_supported(struct device *dev, u64 mask)
-{
-#ifdef CONFIG_ZONE_DMA
- if (mask < DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
- return 0;
-#else
- /*
- * Because 32-bit DMA masks are so common we expect every architecture
- * to be able to satisfy them - either by not supporting more physical
- * memory, or by providing a ZONE_DMA32. If neither is the case, the
- * architecture needs to use an IOMMU instead of the direct mapping.
- */
- if (mask < DMA_BIT_MASK(32))
- return 0;
-#endif
- /*
- * Various PCI/PCIe bridges have broken support for > 32bit DMA even
- * if the device itself might support it.
- */
- if (dev->dma_32bit_limit && mask > DMA_BIT_MASK(32))
- return 0;
- return 1;
-}
-
-int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr == DIRECT_MAPPING_ERROR;
-}
-
-const struct dma_map_ops dma_direct_ops = {
- .alloc = dma_direct_alloc,
- .free = dma_direct_free,
- .map_page = dma_direct_map_page,
- .map_sg = dma_direct_map_sg,
- .dma_supported = dma_direct_supported,
- .mapping_error = dma_direct_mapping_error,
-};
-EXPORT_SYMBOL(dma_direct_ops);
diff --git a/lib/dma-noncoherent.c b/lib/dma-noncoherent.c
deleted file mode 100644
index 79e9a757387f..000000000000
--- a/lib/dma-noncoherent.c
+++ /dev/null
@@ -1,102 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2018 Christoph Hellwig.
- *
- * DMA operations that map physical memory directly without providing cache
- * coherence.
- */
-#include <linux/export.h>
-#include <linux/mm.h>
-#include <linux/dma-direct.h>
-#include <linux/dma-noncoherent.h>
-#include <linux/scatterlist.h>
-
-static void dma_noncoherent_sync_single_for_device(struct device *dev,
- dma_addr_t addr, size_t size, enum dma_data_direction dir)
-{
- arch_sync_dma_for_device(dev, dma_to_phys(dev, addr), size, dir);
-}
-
-static void dma_noncoherent_sync_sg_for_device(struct device *dev,
- struct scatterlist *sgl, int nents, enum dma_data_direction dir)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nents, i)
- arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
-}
-
-static dma_addr_t dma_noncoherent_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- dma_addr_t addr;
-
- addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
- if (!dma_mapping_error(dev, addr) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- arch_sync_dma_for_device(dev, page_to_phys(page) + offset,
- size, dir);
- return addr;
-}
-
-static int dma_noncoherent_map_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- nents = dma_direct_map_sg(dev, sgl, nents, dir, attrs);
- if (nents > 0 && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- dma_noncoherent_sync_sg_for_device(dev, sgl, nents, dir);
- return nents;
-}
-
-#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
-static void dma_noncoherent_sync_single_for_cpu(struct device *dev,
- dma_addr_t addr, size_t size, enum dma_data_direction dir)
-{
- arch_sync_dma_for_cpu(dev, dma_to_phys(dev, addr), size, dir);
-}
-
-static void dma_noncoherent_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sgl, int nents, enum dma_data_direction dir)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nents, i)
- arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
-}
-
-static void dma_noncoherent_unmap_page(struct device *dev, dma_addr_t addr,
- size_t size, enum dma_data_direction dir, unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- dma_noncoherent_sync_single_for_cpu(dev, addr, size, dir);
-}
-
-static void dma_noncoherent_unmap_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- dma_noncoherent_sync_sg_for_cpu(dev, sgl, nents, dir);
-}
-#endif
-
-const struct dma_map_ops dma_noncoherent_ops = {
- .alloc = arch_dma_alloc,
- .free = arch_dma_free,
- .mmap = arch_dma_mmap,
- .sync_single_for_device = dma_noncoherent_sync_single_for_device,
- .sync_sg_for_device = dma_noncoherent_sync_sg_for_device,
- .map_page = dma_noncoherent_map_page,
- .map_sg = dma_noncoherent_map_sg,
-#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
- .sync_single_for_cpu = dma_noncoherent_sync_single_for_cpu,
- .sync_sg_for_cpu = dma_noncoherent_sync_sg_for_cpu,
- .unmap_page = dma_noncoherent_unmap_page,
- .unmap_sg = dma_noncoherent_unmap_sg,
-#endif
- .dma_supported = dma_direct_supported,
- .mapping_error = dma_direct_mapping_error,
- .cache_sync = arch_dma_cache_sync,
-};
-EXPORT_SYMBOL(dma_noncoherent_ops);
diff --git a/lib/dma-virt.c b/lib/dma-virt.c
deleted file mode 100644
index 8e61a02ef9ca..000000000000
--- a/lib/dma-virt.c
+++ /dev/null
@@ -1,61 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * lib/dma-virt.c
- *
- * DMA operations that map to virtual addresses without flushing memory.
- */
-#include <linux/export.h>
-#include <linux/mm.h>
-#include <linux/dma-mapping.h>
-#include <linux/scatterlist.h>
-
-static void *dma_virt_alloc(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp,
- unsigned long attrs)
-{
- void *ret;
-
- ret = (void *)__get_free_pages(gfp, get_order(size));
- if (ret)
- *dma_handle = (uintptr_t)ret;
- return ret;
-}
-
-static void dma_virt_free(struct device *dev, size_t size,
- void *cpu_addr, dma_addr_t dma_addr,
- unsigned long attrs)
-{
- free_pages((unsigned long)cpu_addr, get_order(size));
-}
-
-static dma_addr_t dma_virt_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir,
- unsigned long attrs)
-{
- return (uintptr_t)(page_address(page) + offset);
-}
-
-static int dma_virt_map_sg(struct device *dev, struct scatterlist *sgl,
- int nents, enum dma_data_direction dir,
- unsigned long attrs)
-{
- int i;
- struct scatterlist *sg;
-
- for_each_sg(sgl, sg, nents, i) {
- BUG_ON(!sg_page(sg));
- sg_dma_address(sg) = (uintptr_t)sg_virt(sg);
- sg_dma_len(sg) = sg->length;
- }
-
- return nents;
-}
-
-const struct dma_map_ops dma_virt_ops = {
- .alloc = dma_virt_alloc,
- .free = dma_virt_free,
- .map_page = dma_virt_map_page,
- .map_sg = dma_virt_map_sg,
-};
-EXPORT_SYMBOL(dma_virt_ops);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 7e43cd54c84c..8be175df3075 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -596,15 +596,70 @@ static unsigned long memcpy_mcsafe_to_page(struct page *page, size_t offset,
return ret;
}
+static size_t copy_pipe_to_iter_mcsafe(const void *addr, size_t bytes,
+ struct iov_iter *i)
+{
+ struct pipe_inode_info *pipe = i->pipe;
+ size_t n, off, xfer = 0;
+ int idx;
+
+ if (!sanity(i))
+ return 0;
+
+ bytes = n = push_pipe(i, bytes, &idx, &off);
+ if (unlikely(!n))
+ return 0;
+ for ( ; n; idx = next_idx(idx, pipe), off = 0) {
+ size_t chunk = min_t(size_t, n, PAGE_SIZE - off);
+ unsigned long rem;
+
+ rem = memcpy_mcsafe_to_page(pipe->bufs[idx].page, off, addr,
+ chunk);
+ i->idx = idx;
+ i->iov_offset = off + chunk - rem;
+ xfer += chunk - rem;
+ if (rem)
+ break;
+ n -= chunk;
+ addr += chunk;
+ }
+ i->count -= xfer;
+ return xfer;
+}
+
+/**
+ * _copy_to_iter_mcsafe - copy to user with source-read error exception handling
+ * @addr: source kernel address
+ * @bytes: total transfer length
+ * @iter: destination iterator
+ *
+ * The pmem driver arranges for filesystem-dax to use this facility via
+ * dax_copy_to_iter() for protecting read/write to persistent memory.
+ * Unless / until an architecture can guarantee identical performance
+ * between _copy_to_iter_mcsafe() and _copy_to_iter() it would be a
+ * performance regression to switch more users to the mcsafe version.
+ *
+ * Otherwise, the main differences between this and typical _copy_to_iter().
+ *
+ * * Typical tail/residue handling after a fault retries the copy
+ * byte-by-byte until the fault happens again. Re-triggering machine
+ * checks is potentially fatal so the implementation uses source
+ * alignment and poison alignment assumptions to avoid re-triggering
+ * hardware exceptions.
+ *
+ * * ITER_KVEC, ITER_PIPE, and ITER_BVEC can return short copies.
+ * Compare to copy_to_iter() where only ITER_IOVEC attempts might return
+ * a short copy.
+ *
+ * See MCSAFE_TEST for self-test.
+ */
size_t _copy_to_iter_mcsafe(const void *addr, size_t bytes, struct iov_iter *i)
{
const char *from = addr;
unsigned long rem, curr_addr, s_addr = (unsigned long) addr;
- if (unlikely(i->type & ITER_PIPE)) {
- WARN_ON(1);
- return 0;
- }
+ if (unlikely(i->type & ITER_PIPE))
+ return copy_pipe_to_iter_mcsafe(addr, bytes, i);
if (iter_is_iovec(i))
might_fault();
iterate_and_advance(i, bytes, v,
@@ -701,6 +756,20 @@ size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
EXPORT_SYMBOL(_copy_from_iter_nocache);
#ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
+/**
+ * _copy_from_iter_flushcache - write destination through cpu cache
+ * @addr: destination kernel address
+ * @bytes: total transfer length
+ * @iter: source iterator
+ *
+ * The pmem driver arranges for filesystem-dax to use this facility via
+ * dax_copy_from_iter() for ensuring that writes to persistent memory
+ * are flushed through the CPU cache. It is differentiated from
+ * _copy_from_iter_nocache() in that guarantees all data is flushed for
+ * all iterator types. The _copy_from_iter_nocache() only attempts to
+ * bypass the cache for the ITER_IOVEC case, and on some archs may use
+ * instructions that strand dirty-data in the cache.
+ */
size_t _copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
{
char *to = addr;
diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c
index 9bbd9c5d375a..beb14839b41a 100644
--- a/lib/percpu_ida.c
+++ b/lib/percpu_ida.c
@@ -141,7 +141,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
spin_lock_irqsave(&tags->lock, flags);
/* Fastpath */
- if (likely(tags->nr_free >= 0)) {
+ if (likely(tags->nr_free)) {
tag = tags->freelist[--tags->nr_free];
spin_unlock_irqrestore(&tags->lock, flags);
return tag;
diff --git a/lib/refcount.c b/lib/refcount.c
index 0eb48353abe3..d3b81cefce91 100644
--- a/lib/refcount.c
+++ b/lib/refcount.c
@@ -350,3 +350,31 @@ bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock)
}
EXPORT_SYMBOL(refcount_dec_and_lock);
+/**
+ * refcount_dec_and_lock_irqsave - return holding spinlock with disabled
+ * interrupts if able to decrement refcount to 0
+ * @r: the refcount
+ * @lock: the spinlock to be locked
+ * @flags: saved IRQ-flags if the is acquired
+ *
+ * Same as refcount_dec_and_lock() above except that the spinlock is acquired
+ * with disabled interupts.
+ *
+ * Return: true and hold spinlock if able to decrement refcount to 0, false
+ * otherwise
+ */
+bool refcount_dec_and_lock_irqsave(refcount_t *r, spinlock_t *lock,
+ unsigned long *flags)
+{
+ if (refcount_dec_not_one(r))
+ return false;
+
+ spin_lock_irqsave(lock, *flags);
+ if (!refcount_dec_and_test(r)) {
+ spin_unlock_irqrestore(lock, *flags);
+ return false;
+ }
+
+ return true;
+}
+EXPORT_SYMBOL(refcount_dec_and_lock_irqsave);
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 9427b5766134..e5c8586cf717 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -774,7 +774,7 @@ int rhashtable_walk_start_check(struct rhashtable_iter *iter)
skip++;
if (list == iter->list) {
iter->p = p;
- skip = skip;
+ iter->skip = skip;
goto found;
}
}
@@ -964,8 +964,16 @@ EXPORT_SYMBOL_GPL(rhashtable_walk_stop);
static size_t rounded_hashtable_size(const struct rhashtable_params *params)
{
- return max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
- (unsigned long)params->min_size);
+ size_t retsize;
+
+ if (params->nelem_hint)
+ retsize = max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
+ (unsigned long)params->min_size);
+ else
+ retsize = max(HASH_DEFAULT_SIZE,
+ (unsigned long)params->min_size);
+
+ return retsize;
}
static u32 rhashtable_jhash2(const void *key, u32 length, u32 seed)
@@ -1022,8 +1030,6 @@ int rhashtable_init(struct rhashtable *ht,
struct bucket_table *tbl;
size_t size;
- size = HASH_DEFAULT_SIZE;
-
if ((!params->key_len && !params->obj_hashfn) ||
(params->obj_hashfn && !params->obj_cmpfn))
return -EINVAL;
@@ -1050,8 +1056,7 @@ int rhashtable_init(struct rhashtable *ht,
ht->p.min_size = max_t(u16, ht->p.min_size, HASH_MIN_SIZE);
- if (params->nelem_hint)
- size = rounded_hashtable_size(&ht->p);
+ size = rounded_hashtable_size(&ht->p);
if (params->locks_mul)
ht->p.locks_mul = roundup_pow_of_two(params->locks_mul);
@@ -1143,13 +1148,14 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
void (*free_fn)(void *ptr, void *arg),
void *arg)
{
- struct bucket_table *tbl;
+ struct bucket_table *tbl, *next_tbl;
unsigned int i;
cancel_work_sync(&ht->run_work);
mutex_lock(&ht->mutex);
tbl = rht_dereference(ht->tbl, ht);
+restart:
if (free_fn) {
for (i = 0; i < tbl->size; i++) {
struct rhash_head *pos, *next;
@@ -1166,7 +1172,12 @@ void rhashtable_free_and_destroy(struct rhashtable *ht,
}
}
+ next_tbl = rht_dereference(tbl->future_tbl, ht);
bucket_table_free(tbl);
+ if (next_tbl) {
+ tbl = next_tbl;
+ goto restart;
+ }
mutex_unlock(&ht->mutex);
}
EXPORT_SYMBOL_GPL(rhashtable_free_and_destroy);
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 1642fd507a96..7c6096a71704 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -24,9 +24,6 @@
**/
struct scatterlist *sg_next(struct scatterlist *sg)
{
-#ifdef CONFIG_DEBUG_SG
- BUG_ON(sg->sg_magic != SG_MAGIC);
-#endif
if (sg_is_last(sg))
return NULL;
@@ -111,10 +108,7 @@ struct scatterlist *sg_last(struct scatterlist *sgl, unsigned int nents)
for_each_sg(sgl, sg, nents, i)
ret = sg;
-#ifdef CONFIG_DEBUG_SG
- BUG_ON(sgl[0].sg_magic != SG_MAGIC);
BUG_ON(!sg_is_last(ret));
-#endif
return ret;
}
EXPORT_SYMBOL(sg_last);
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
deleted file mode 100644
index 04b68d9dffac..000000000000
--- a/lib/swiotlb.c
+++ /dev/null
@@ -1,1087 +0,0 @@
-/*
- * Dynamic DMA mapping support.
- *
- * This implementation is a fallback for platforms that do not support
- * I/O TLBs (aka DMA address translation hardware).
- * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com>
- * Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com>
- * Copyright (C) 2000, 2003 Hewlett-Packard Co
- * David Mosberger-Tang <davidm@hpl.hp.com>
- *
- * 03/05/07 davidm Switch from PCI-DMA to generic device DMA API.
- * 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid
- * unnecessary i-cache flushing.
- * 04/07/.. ak Better overflow handling. Assorted fixes.
- * 05/09/10 linville Add support for syncing ranges, support syncing for
- * DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
- * 08/12/11 beckyb Add highmem support
- */
-
-#include <linux/cache.h>
-#include <linux/dma-direct.h>
-#include <linux/mm.h>
-#include <linux/export.h>
-#include <linux/spinlock.h>
-#include <linux/string.h>
-#include <linux/swiotlb.h>
-#include <linux/pfn.h>
-#include <linux/types.h>
-#include <linux/ctype.h>
-#include <linux/highmem.h>
-#include <linux/gfp.h>
-#include <linux/scatterlist.h>
-#include <linux/mem_encrypt.h>
-#include <linux/set_memory.h>
-
-#include <asm/io.h>
-#include <asm/dma.h>
-
-#include <linux/init.h>
-#include <linux/bootmem.h>
-#include <linux/iommu-helper.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/swiotlb.h>
-
-#define OFFSET(val,align) ((unsigned long) \
- ( (val) & ( (align) - 1)))
-
-#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
-
-/*
- * Minimum IO TLB size to bother booting with. Systems with mainly
- * 64bit capable cards will only lightly use the swiotlb. If we can't
- * allocate a contiguous 1MB, we're probably in trouble anyway.
- */
-#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
-
-enum swiotlb_force swiotlb_force;
-
-/*
- * Used to do a quick range check in swiotlb_tbl_unmap_single and
- * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
- * API.
- */
-static phys_addr_t io_tlb_start, io_tlb_end;
-
-/*
- * The number of IO TLB blocks (in groups of 64) between io_tlb_start and
- * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
- */
-static unsigned long io_tlb_nslabs;
-
-/*
- * When the IOMMU overflows we return a fallback buffer. This sets the size.
- */
-static unsigned long io_tlb_overflow = 32*1024;
-
-static phys_addr_t io_tlb_overflow_buffer;
-
-/*
- * This is a free list describing the number of free entries available from
- * each index
- */
-static unsigned int *io_tlb_list;
-static unsigned int io_tlb_index;
-
-/*
- * Max segment that we can provide which (if pages are contingous) will
- * not be bounced (unless SWIOTLB_FORCE is set).
- */
-unsigned int max_segment;
-
-/*
- * We need to save away the original address corresponding to a mapped entry
- * for the sync operations.
- */
-#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
-static phys_addr_t *io_tlb_orig_addr;
-
-/*
- * Protect the above data structures in the map and unmap calls
- */
-static DEFINE_SPINLOCK(io_tlb_lock);
-
-static int late_alloc;
-
-static int __init
-setup_io_tlb_npages(char *str)
-{
- if (isdigit(*str)) {
- io_tlb_nslabs = simple_strtoul(str, &str, 0);
- /* avoid tail segment of size < IO_TLB_SEGSIZE */
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
- if (*str == ',')
- ++str;
- if (!strcmp(str, "force")) {
- swiotlb_force = SWIOTLB_FORCE;
- } else if (!strcmp(str, "noforce")) {
- swiotlb_force = SWIOTLB_NO_FORCE;
- io_tlb_nslabs = 1;
- }
-
- return 0;
-}
-early_param("swiotlb", setup_io_tlb_npages);
-/* make io_tlb_overflow tunable too? */
-
-unsigned long swiotlb_nr_tbl(void)
-{
- return io_tlb_nslabs;
-}
-EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
-
-unsigned int swiotlb_max_segment(void)
-{
- return max_segment;
-}
-EXPORT_SYMBOL_GPL(swiotlb_max_segment);
-
-void swiotlb_set_max_segment(unsigned int val)
-{
- if (swiotlb_force == SWIOTLB_FORCE)
- max_segment = 1;
- else
- max_segment = rounddown(val, PAGE_SIZE);
-}
-
-/* default to 64MB */
-#define IO_TLB_DEFAULT_SIZE (64UL<<20)
-unsigned long swiotlb_size_or_default(void)
-{
- unsigned long size;
-
- size = io_tlb_nslabs << IO_TLB_SHIFT;
-
- return size ? size : (IO_TLB_DEFAULT_SIZE);
-}
-
-static bool no_iotlb_memory;
-
-void swiotlb_print_info(void)
-{
- unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
- unsigned char *vstart, *vend;
-
- if (no_iotlb_memory) {
- pr_warn("software IO TLB: No low mem\n");
- return;
- }
-
- vstart = phys_to_virt(io_tlb_start);
- vend = phys_to_virt(io_tlb_end);
-
- printk(KERN_INFO "software IO TLB [mem %#010llx-%#010llx] (%luMB) mapped at [%p-%p]\n",
- (unsigned long long)io_tlb_start,
- (unsigned long long)io_tlb_end,
- bytes >> 20, vstart, vend - 1);
-}
-
-/*
- * Early SWIOTLB allocation may be too early to allow an architecture to
- * perform the desired operations. This function allows the architecture to
- * call SWIOTLB when the operations are possible. It needs to be called
- * before the SWIOTLB memory is used.
- */
-void __init swiotlb_update_mem_attributes(void)
-{
- void *vaddr;
- unsigned long bytes;
-
- if (no_iotlb_memory || late_alloc)
- return;
-
- vaddr = phys_to_virt(io_tlb_start);
- bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
- set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
- memset(vaddr, 0, bytes);
-
- vaddr = phys_to_virt(io_tlb_overflow_buffer);
- bytes = PAGE_ALIGN(io_tlb_overflow);
- set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
- memset(vaddr, 0, bytes);
-}
-
-int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
-{
- void *v_overflow_buffer;
- unsigned long i, bytes;
-
- bytes = nslabs << IO_TLB_SHIFT;
-
- io_tlb_nslabs = nslabs;
- io_tlb_start = __pa(tlb);
- io_tlb_end = io_tlb_start + bytes;
-
- /*
- * Get the overflow emergency buffer
- */
- v_overflow_buffer = memblock_virt_alloc_low_nopanic(
- PAGE_ALIGN(io_tlb_overflow),
- PAGE_SIZE);
- if (!v_overflow_buffer)
- return -ENOMEM;
-
- io_tlb_overflow_buffer = __pa(v_overflow_buffer);
-
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between io_tlb_start and io_tlb_end.
- */
- io_tlb_list = memblock_virt_alloc(
- PAGE_ALIGN(io_tlb_nslabs * sizeof(int)),
- PAGE_SIZE);
- io_tlb_orig_addr = memblock_virt_alloc(
- PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)),
- PAGE_SIZE);
- for (i = 0; i < io_tlb_nslabs; i++) {
- io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
- }
- io_tlb_index = 0;
-
- if (verbose)
- swiotlb_print_info();
-
- swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
- return 0;
-}
-
-/*
- * Statically reserve bounce buffer space and initialize bounce buffer data
- * structures for the software IO TLB used to implement the DMA API.
- */
-void __init
-swiotlb_init(int verbose)
-{
- size_t default_size = IO_TLB_DEFAULT_SIZE;
- unsigned char *vstart;
- unsigned long bytes;
-
- if (!io_tlb_nslabs) {
- io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
-
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
-
- /* Get IO TLB memory from the low pages */
- vstart = memblock_virt_alloc_low_nopanic(PAGE_ALIGN(bytes), PAGE_SIZE);
- if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose))
- return;
-
- if (io_tlb_start)
- memblock_free_early(io_tlb_start,
- PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
- pr_warn("Cannot allocate SWIOTLB buffer");
- no_iotlb_memory = true;
-}
-
-/*
- * Systems with larger DMA zones (those that don't support ISA) can
- * initialize the swiotlb later using the slab allocator if needed.
- * This should be just like above, but with some error catching.
- */
-int
-swiotlb_late_init_with_default_size(size_t default_size)
-{
- unsigned long bytes, req_nslabs = io_tlb_nslabs;
- unsigned char *vstart = NULL;
- unsigned int order;
- int rc = 0;
-
- if (!io_tlb_nslabs) {
- io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
- }
-
- /*
- * Get IO TLB memory from the low pages
- */
- order = get_order(io_tlb_nslabs << IO_TLB_SHIFT);
- io_tlb_nslabs = SLABS_PER_PAGE << order;
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
-
- while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
- vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
- order);
- if (vstart)
- break;
- order--;
- }
-
- if (!vstart) {
- io_tlb_nslabs = req_nslabs;
- return -ENOMEM;
- }
- if (order != get_order(bytes)) {
- printk(KERN_WARNING "Warning: only able to allocate %ld MB "
- "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
- io_tlb_nslabs = SLABS_PER_PAGE << order;
- }
- rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs);
- if (rc)
- free_pages((unsigned long)vstart, order);
-
- return rc;
-}
-
-int
-swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
-{
- unsigned long i, bytes;
- unsigned char *v_overflow_buffer;
-
- bytes = nslabs << IO_TLB_SHIFT;
-
- io_tlb_nslabs = nslabs;
- io_tlb_start = virt_to_phys(tlb);
- io_tlb_end = io_tlb_start + bytes;
-
- set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
- memset(tlb, 0, bytes);
-
- /*
- * Get the overflow emergency buffer
- */
- v_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
- get_order(io_tlb_overflow));
- if (!v_overflow_buffer)
- goto cleanup2;
-
- set_memory_decrypted((unsigned long)v_overflow_buffer,
- io_tlb_overflow >> PAGE_SHIFT);
- memset(v_overflow_buffer, 0, io_tlb_overflow);
- io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);
-
- /*
- * Allocate and initialize the free list array. This array is used
- * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
- * between io_tlb_start and io_tlb_end.
- */
- io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs * sizeof(int)));
- if (!io_tlb_list)
- goto cleanup3;
-
- io_tlb_orig_addr = (phys_addr_t *)
- __get_free_pages(GFP_KERNEL,
- get_order(io_tlb_nslabs *
- sizeof(phys_addr_t)));
- if (!io_tlb_orig_addr)
- goto cleanup4;
-
- for (i = 0; i < io_tlb_nslabs; i++) {
- io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
- }
- io_tlb_index = 0;
-
- swiotlb_print_info();
-
- late_alloc = 1;
-
- swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
-
- return 0;
-
-cleanup4:
- free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
- sizeof(int)));
- io_tlb_list = NULL;
-cleanup3:
- free_pages((unsigned long)v_overflow_buffer,
- get_order(io_tlb_overflow));
- io_tlb_overflow_buffer = 0;
-cleanup2:
- io_tlb_end = 0;
- io_tlb_start = 0;
- io_tlb_nslabs = 0;
- max_segment = 0;
- return -ENOMEM;
-}
-
-void __init swiotlb_exit(void)
-{
- if (!io_tlb_orig_addr)
- return;
-
- if (late_alloc) {
- free_pages((unsigned long)phys_to_virt(io_tlb_overflow_buffer),
- get_order(io_tlb_overflow));
- free_pages((unsigned long)io_tlb_orig_addr,
- get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
- free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
- sizeof(int)));
- free_pages((unsigned long)phys_to_virt(io_tlb_start),
- get_order(io_tlb_nslabs << IO_TLB_SHIFT));
- } else {
- memblock_free_late(io_tlb_overflow_buffer,
- PAGE_ALIGN(io_tlb_overflow));
- memblock_free_late(__pa(io_tlb_orig_addr),
- PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
- memblock_free_late(__pa(io_tlb_list),
- PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
- memblock_free_late(io_tlb_start,
- PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
- }
- io_tlb_nslabs = 0;
- max_segment = 0;
-}
-
-int is_swiotlb_buffer(phys_addr_t paddr)
-{
- return paddr >= io_tlb_start && paddr < io_tlb_end;
-}
-
-/*
- * Bounce: copy the swiotlb buffer back to the original dma location
- */
-static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
- size_t size, enum dma_data_direction dir)
-{
- unsigned long pfn = PFN_DOWN(orig_addr);
- unsigned char *vaddr = phys_to_virt(tlb_addr);
-
- if (PageHighMem(pfn_to_page(pfn))) {
- /* The buffer does not have a mapping. Map it in and copy */
- unsigned int offset = orig_addr & ~PAGE_MASK;
- char *buffer;
- unsigned int sz = 0;
- unsigned long flags;
-
- while (size) {
- sz = min_t(size_t, PAGE_SIZE - offset, size);
-
- local_irq_save(flags);
- buffer = kmap_atomic(pfn_to_page(pfn));
- if (dir == DMA_TO_DEVICE)
- memcpy(vaddr, buffer + offset, sz);
- else
- memcpy(buffer + offset, vaddr, sz);
- kunmap_atomic(buffer);
- local_irq_restore(flags);
-
- size -= sz;
- pfn++;
- vaddr += sz;
- offset = 0;
- }
- } else if (dir == DMA_TO_DEVICE) {
- memcpy(vaddr, phys_to_virt(orig_addr), size);
- } else {
- memcpy(phys_to_virt(orig_addr), vaddr, size);
- }
-}
-
-phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
- dma_addr_t tbl_dma_addr,
- phys_addr_t orig_addr, size_t size,
- enum dma_data_direction dir,
- unsigned long attrs)
-{
- unsigned long flags;
- phys_addr_t tlb_addr;
- unsigned int nslots, stride, index, wrap;
- int i;
- unsigned long mask;
- unsigned long offset_slots;
- unsigned long max_slots;
-
- if (no_iotlb_memory)
- panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
-
- if (mem_encrypt_active())
- pr_warn_once("%s is active and system is using DMA bounce buffers\n",
- sme_active() ? "SME" : "SEV");
-
- mask = dma_get_seg_boundary(hwdev);
-
- tbl_dma_addr &= mask;
-
- offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
-
- /*
- * Carefully handle integer overflow which can occur when mask == ~0UL.
- */
- max_slots = mask + 1
- ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
- : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
-
- /*
- * For mappings greater than or equal to a page, we limit the stride
- * (and hence alignment) to a page size.
- */
- nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
- if (size >= PAGE_SIZE)
- stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
- else
- stride = 1;
-
- BUG_ON(!nslots);
-
- /*
- * Find suitable number of IO TLB entries size that will fit this
- * request and allocate a buffer from that IO TLB pool.
- */
- spin_lock_irqsave(&io_tlb_lock, flags);
- index = ALIGN(io_tlb_index, stride);
- if (index >= io_tlb_nslabs)
- index = 0;
- wrap = index;
-
- do {
- while (iommu_is_span_boundary(index, nslots, offset_slots,
- max_slots)) {
- index += stride;
- if (index >= io_tlb_nslabs)
- index = 0;
- if (index == wrap)
- goto not_found;
- }
-
- /*
- * If we find a slot that indicates we have 'nslots' number of
- * contiguous buffers, we allocate the buffers from that slot
- * and mark the entries as '0' indicating unavailable.
- */
- if (io_tlb_list[index] >= nslots) {
- int count = 0;
-
- for (i = index; i < (int) (index + nslots); i++)
- io_tlb_list[i] = 0;
- for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--)
- io_tlb_list[i] = ++count;
- tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT);
-
- /*
- * Update the indices to avoid searching in the next
- * round.
- */
- io_tlb_index = ((index + nslots) < io_tlb_nslabs
- ? (index + nslots) : 0);
-
- goto found;
- }
- index += stride;
- if (index >= io_tlb_nslabs)
- index = 0;
- } while (index != wrap);
-
-not_found:
- spin_unlock_irqrestore(&io_tlb_lock, flags);
- if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
- dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
- return SWIOTLB_MAP_ERROR;
-found:
- spin_unlock_irqrestore(&io_tlb_lock, flags);
-
- /*
- * Save away the mapping from the original address to the DMA address.
- * This is needed when we sync the memory. Then we sync the buffer if
- * needed.
- */
- for (i = 0; i < nslots; i++)
- io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
- if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
- (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE);
-
- return tlb_addr;
-}
-
-/*
- * Allocates bounce buffer and returns its physical address.
- */
-static phys_addr_t
-map_single(struct device *hwdev, phys_addr_t phys, size_t size,
- enum dma_data_direction dir, unsigned long attrs)
-{
- dma_addr_t start_dma_addr;
-
- if (swiotlb_force == SWIOTLB_NO_FORCE) {
- dev_warn_ratelimited(hwdev, "Cannot do DMA to address %pa\n",
- &phys);
- return SWIOTLB_MAP_ERROR;
- }
-
- start_dma_addr = __phys_to_dma(hwdev, io_tlb_start);
- return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size,
- dir, attrs);
-}
-
-/*
- * tlb_addr is the physical address of the bounce buffer to unmap.
- */
-void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- unsigned long flags;
- int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
- int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
- phys_addr_t orig_addr = io_tlb_orig_addr[index];
-
- /*
- * First, sync the memory before unmapping the entry
- */
- if (orig_addr != INVALID_PHYS_ADDR &&
- !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
- ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
- swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
-
- /*
- * Return the buffer to the free list by setting the corresponding
- * entries to indicate the number of contiguous entries available.
- * While returning the entries to the free list, we merge the entries
- * with slots below and above the pool being returned.
- */
- spin_lock_irqsave(&io_tlb_lock, flags);
- {
- count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
- io_tlb_list[index + nslots] : 0);
- /*
- * Step 1: return the slots to the free list, merging the
- * slots with superceeding slots
- */
- for (i = index + nslots - 1; i >= index; i--) {
- io_tlb_list[i] = ++count;
- io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
- }
- /*
- * Step 2: merge the returned slots with the preceding slots,
- * if available (non zero)
- */
- for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
- io_tlb_list[i] = ++count;
- }
- spin_unlock_irqrestore(&io_tlb_lock, flags);
-}
-
-void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
- size_t size, enum dma_data_direction dir,
- enum dma_sync_target target)
-{
- int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
- phys_addr_t orig_addr = io_tlb_orig_addr[index];
-
- if (orig_addr == INVALID_PHYS_ADDR)
- return;
- orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
-
- switch (target) {
- case SYNC_FOR_CPU:
- if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, tlb_addr,
- size, DMA_FROM_DEVICE);
- else
- BUG_ON(dir != DMA_TO_DEVICE);
- break;
- case SYNC_FOR_DEVICE:
- if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
- swiotlb_bounce(orig_addr, tlb_addr,
- size, DMA_TO_DEVICE);
- else
- BUG_ON(dir != DMA_FROM_DEVICE);
- break;
- default:
- BUG();
- }
-}
-
-static inline bool dma_coherent_ok(struct device *dev, dma_addr_t addr,
- size_t size)
-{
- u64 mask = DMA_BIT_MASK(32);
-
- if (dev && dev->coherent_dma_mask)
- mask = dev->coherent_dma_mask;
- return addr + size - 1 <= mask;
-}
-
-static void *
-swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle,
- unsigned long attrs)
-{
- phys_addr_t phys_addr;
-
- if (swiotlb_force == SWIOTLB_NO_FORCE)
- goto out_warn;
-
- phys_addr = swiotlb_tbl_map_single(dev,
- __phys_to_dma(dev, io_tlb_start),
- 0, size, DMA_FROM_DEVICE, attrs);
- if (phys_addr == SWIOTLB_MAP_ERROR)
- goto out_warn;
-
- *dma_handle = __phys_to_dma(dev, phys_addr);
- if (!dma_coherent_ok(dev, *dma_handle, size))
- goto out_unmap;
-
- memset(phys_to_virt(phys_addr), 0, size);
- return phys_to_virt(phys_addr);
-
-out_unmap:
- dev_warn(dev, "hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
- (unsigned long long)dev->coherent_dma_mask,
- (unsigned long long)*dma_handle);
-
- /*
- * DMA_TO_DEVICE to avoid memcpy in unmap_single.
- * DMA_ATTR_SKIP_CPU_SYNC is optional.
- */
- swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE,
- DMA_ATTR_SKIP_CPU_SYNC);
-out_warn:
- if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit()) {
- dev_warn(dev,
- "swiotlb: coherent allocation failed, size=%zu\n",
- size);
- dump_stack();
- }
- return NULL;
-}
-
-static bool swiotlb_free_buffer(struct device *dev, size_t size,
- dma_addr_t dma_addr)
-{
- phys_addr_t phys_addr = dma_to_phys(dev, dma_addr);
-
- WARN_ON_ONCE(irqs_disabled());
-
- if (!is_swiotlb_buffer(phys_addr))
- return false;
-
- /*
- * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single.
- * DMA_ATTR_SKIP_CPU_SYNC is optional.
- */
- swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE,
- DMA_ATTR_SKIP_CPU_SYNC);
- return true;
-}
-
-static void
-swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir,
- int do_panic)
-{
- if (swiotlb_force == SWIOTLB_NO_FORCE)
- return;
-
- /*
- * Ran out of IOMMU space for this operation. This is very bad.
- * Unfortunately the drivers cannot handle this operation properly.
- * unless they check for dma_mapping_error (most don't)
- * When the mapping is small enough return a static buffer to limit
- * the damage, or panic when the transfer is too big.
- */
- dev_err_ratelimited(dev, "DMA: Out of SW-IOMMU space for %zu bytes\n",
- size);
-
- if (size <= io_tlb_overflow || !do_panic)
- return;
-
- if (dir == DMA_BIDIRECTIONAL)
- panic("DMA: Random memory could be DMA accessed\n");
- if (dir == DMA_FROM_DEVICE)
- panic("DMA: Random memory could be DMA written\n");
- if (dir == DMA_TO_DEVICE)
- panic("DMA: Random memory could be DMA read\n");
-}
-
-/*
- * Map a single buffer of the indicated size for DMA in streaming mode. The
- * physical address to use is returned.
- *
- * Once the device is given the dma address, the device owns this memory until
- * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
- */
-dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size,
- enum dma_data_direction dir,
- unsigned long attrs)
-{
- phys_addr_t map, phys = page_to_phys(page) + offset;
- dma_addr_t dev_addr = phys_to_dma(dev, phys);
-
- BUG_ON(dir == DMA_NONE);
- /*
- * If the address happens to be in the device's DMA window,
- * we can safely return the device addr and not worry about bounce
- * buffering it.
- */
- if (dma_capable(dev, dev_addr, size) && swiotlb_force != SWIOTLB_FORCE)
- return dev_addr;
-
- trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
-
- /* Oh well, have to allocate and map a bounce buffer. */
- map = map_single(dev, phys, size, dir, attrs);
- if (map == SWIOTLB_MAP_ERROR) {
- swiotlb_full(dev, size, dir, 1);
- return __phys_to_dma(dev, io_tlb_overflow_buffer);
- }
-
- dev_addr = __phys_to_dma(dev, map);
-
- /* Ensure that the address returned is DMA'ble */
- if (dma_capable(dev, dev_addr, size))
- return dev_addr;
-
- attrs |= DMA_ATTR_SKIP_CPU_SYNC;
- swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
-
- return __phys_to_dma(dev, io_tlb_overflow_buffer);
-}
-
-/*
- * Unmap a single streaming mode DMA translation. The dma_addr and size must
- * match what was provided for in a previous swiotlb_map_page call. All
- * other usages are undefined.
- *
- * After this call, reads by the cpu to the buffer are guaranteed to see
- * whatever the device wrote there.
- */
-static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
- BUG_ON(dir == DMA_NONE);
-
- if (is_swiotlb_buffer(paddr)) {
- swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs);
- return;
- }
-
- if (dir != DMA_FROM_DEVICE)
- return;
-
- /*
- * phys_to_virt doesn't work with hihgmem page but we could
- * call dma_mark_clean() with hihgmem page here. However, we
- * are fine since dma_mark_clean() is null on POWERPC. We can
- * make dma_mark_clean() take a physical address if necessary.
- */
- dma_mark_clean(phys_to_virt(paddr), size);
-}
-
-void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- unmap_single(hwdev, dev_addr, size, dir, attrs);
-}
-
-/*
- * Make physical memory consistent for a single streaming mode DMA translation
- * after a transfer.
- *
- * If you perform a swiotlb_map_page() but wish to interrogate the buffer
- * using the cpu, yet do not wish to teardown the dma mapping, you must
- * call this function before doing so. At the next point you give the dma
- * address back to the card, you must first perform a
- * swiotlb_dma_sync_for_device, and then the device again owns the buffer
- */
-static void
-swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir,
- enum dma_sync_target target)
-{
- phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
-
- BUG_ON(dir == DMA_NONE);
-
- if (is_swiotlb_buffer(paddr)) {
- swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
- return;
- }
-
- if (dir != DMA_FROM_DEVICE)
- return;
-
- dma_mark_clean(phys_to_virt(paddr), size);
-}
-
-void
-swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir)
-{
- swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
-}
-
-void
-swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir)
-{
- swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
-}
-
-/*
- * Map a set of buffers described by scatterlist in streaming mode for DMA.
- * This is the scatter-gather version of the above swiotlb_map_page
- * interface. Here the scatter gather list elements are each tagged with the
- * appropriate dma address and length. They are obtained via
- * sg_dma_{address,length}(SG).
- *
- * NOTE: An implementation may be able to use a smaller number of
- * DMA address/length pairs than there are SG table elements.
- * (for example via virtual mapping capabilities)
- * The routine returns the number of addr/length pairs actually
- * used, at most nents.
- *
- * Device ownership issues as mentioned above for swiotlb_map_page are the
- * same here.
- */
-int
-swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
- enum dma_data_direction dir, unsigned long attrs)
-{
- struct scatterlist *sg;
- int i;
-
- BUG_ON(dir == DMA_NONE);
-
- for_each_sg(sgl, sg, nelems, i) {
- phys_addr_t paddr = sg_phys(sg);
- dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
-
- if (swiotlb_force == SWIOTLB_FORCE ||
- !dma_capable(hwdev, dev_addr, sg->length)) {
- phys_addr_t map = map_single(hwdev, sg_phys(sg),
- sg->length, dir, attrs);
- if (map == SWIOTLB_MAP_ERROR) {
- /* Don't panic here, we expect map_sg users
- to do proper error handling. */
- swiotlb_full(hwdev, sg->length, dir, 0);
- attrs |= DMA_ATTR_SKIP_CPU_SYNC;
- swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
- attrs);
- sg_dma_len(sgl) = 0;
- return 0;
- }
- sg->dma_address = __phys_to_dma(hwdev, map);
- } else
- sg->dma_address = dev_addr;
- sg_dma_len(sg) = sg->length;
- }
- return nelems;
-}
-
-/*
- * Unmap a set of streaming mode DMA translations. Again, cpu read rules
- * concerning calls here are the same as for swiotlb_unmap_page() above.
- */
-void
-swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
- int nelems, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct scatterlist *sg;
- int i;
-
- BUG_ON(dir == DMA_NONE);
-
- for_each_sg(sgl, sg, nelems, i)
- unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir,
- attrs);
-}
-
-/*
- * Make physical memory consistent for a set of streaming mode DMA translations
- * after a transfer.
- *
- * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
- * and usage.
- */
-static void
-swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
- int nelems, enum dma_data_direction dir,
- enum dma_sync_target target)
-{
- struct scatterlist *sg;
- int i;
-
- for_each_sg(sgl, sg, nelems, i)
- swiotlb_sync_single(hwdev, sg->dma_address,
- sg_dma_len(sg), dir, target);
-}
-
-void
-swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
- int nelems, enum dma_data_direction dir)
-{
- swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
-}
-
-void
-swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
- int nelems, enum dma_data_direction dir)
-{
- swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
-}
-
-int
-swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
-{
- return (dma_addr == __phys_to_dma(hwdev, io_tlb_overflow_buffer));
-}
-
-/*
- * Return whether the given device DMA address mask can be supported
- * properly. For example, if your device can only drive the low 24-bits
- * during bus mastering, then you would pass 0x00ffffff as the mask to
- * this function.
- */
-int
-swiotlb_dma_supported(struct device *hwdev, u64 mask)
-{
- return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
-}
-
-void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
- gfp_t gfp, unsigned long attrs)
-{
- void *vaddr;
-
- /* temporary workaround: */
- if (gfp & __GFP_NOWARN)
- attrs |= DMA_ATTR_NO_WARN;
-
- /*
- * Don't print a warning when the first allocation attempt fails.
- * swiotlb_alloc_coherent() will print a warning when the DMA memory
- * allocation ultimately failed.
- */
- gfp |= __GFP_NOWARN;
-
- vaddr = dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
- if (!vaddr)
- vaddr = swiotlb_alloc_buffer(dev, size, dma_handle, attrs);
- return vaddr;
-}
-
-void swiotlb_free(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_addr, unsigned long attrs)
-{
- if (!swiotlb_free_buffer(dev, size, dma_addr))
- dma_direct_free(dev, size, vaddr, dma_addr, attrs);
-}
-
-const struct dma_map_ops swiotlb_dma_ops = {
- .mapping_error = swiotlb_dma_mapping_error,
- .alloc = swiotlb_alloc,
- .free = swiotlb_free,
- .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
- .sync_single_for_device = swiotlb_sync_single_for_device,
- .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
- .sync_sg_for_device = swiotlb_sync_sg_for_device,
- .map_sg = swiotlb_map_sg_attrs,
- .unmap_sg = swiotlb_unmap_sg_attrs,
- .map_page = swiotlb_map_page,
- .unmap_page = swiotlb_unmap_page,
- .dma_supported = dma_direct_supported,
-};
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 60aedc879361..08d3d59dca17 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -5282,21 +5282,31 @@ static struct bpf_test tests[] = {
{ /* Mainly checking JIT here. */
"BPF_MAXINSNS: Ctx heavy transformations",
{ },
+#if defined(CONFIG_BPF_JIT_ALWAYS_ON) && defined(CONFIG_S390)
+ CLASSIC | FLAG_EXPECTED_FAIL,
+#else
CLASSIC,
+#endif
{ },
{
{ 1, !!(SKB_VLAN_TCI & VLAN_TAG_PRESENT) },
{ 10, !!(SKB_VLAN_TCI & VLAN_TAG_PRESENT) }
},
.fill_helper = bpf_fill_maxinsns6,
+ .expected_errcode = -ENOTSUPP,
},
{ /* Mainly checking JIT here. */
"BPF_MAXINSNS: Call heavy transformations",
{ },
+#if defined(CONFIG_BPF_JIT_ALWAYS_ON) && defined(CONFIG_S390)
+ CLASSIC | FLAG_NO_DATA | FLAG_EXPECTED_FAIL,
+#else
CLASSIC | FLAG_NO_DATA,
+#endif
{ },
{ { 1, 0 }, { 10, 0 } },
.fill_helper = bpf_fill_maxinsns7,
+ .expected_errcode = -ENOTSUPP,
},
{ /* Mainly checking JIT here. */
"BPF_MAXINSNS: Jump heavy test",
@@ -5347,18 +5357,28 @@ static struct bpf_test tests[] = {
{
"BPF_MAXINSNS: exec all MSH",
{ },
+#if defined(CONFIG_BPF_JIT_ALWAYS_ON) && defined(CONFIG_S390)
+ CLASSIC | FLAG_EXPECTED_FAIL,
+#else
CLASSIC,
+#endif
{ 0xfa, 0xfb, 0xfc, 0xfd, },
{ { 4, 0xababab83 } },
.fill_helper = bpf_fill_maxinsns13,
+ .expected_errcode = -ENOTSUPP,
},
{
"BPF_MAXINSNS: ld_abs+get_processor_id",
{ },
+#if defined(CONFIG_BPF_JIT_ALWAYS_ON) && defined(CONFIG_S390)
+ CLASSIC | FLAG_EXPECTED_FAIL,
+#else
CLASSIC,
+#endif
{ },
{ { 1, 0xbee } },
.fill_helper = bpf_fill_ld_abs_get_processor_id,
+ .expected_errcode = -ENOTSUPP,
},
/*
* LD_IND / LD_ABS on fragmented SKBs
diff --git a/lib/test_printf.c b/lib/test_printf.c
index b2aa8f514844..cea592f402ed 100644
--- a/lib/test_printf.c
+++ b/lib/test_printf.c
@@ -260,13 +260,6 @@ plain(void)
{
int err;
- /*
- * Make sure crng is ready. Otherwise we get "(ptrval)" instead
- * of a hashed address when printing '%p' in plain_hash() and
- * plain_format().
- */
- wait_for_random_bytes();
-
err = plain_hash();
if (err) {
pr_warn("plain 'p' does not appear to be hashed\n");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-16 15:49:51 +0000