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authorJake Oshins2015-08-05 00:52:37 -0700
committerGreg Kroah-Hartman2015-08-05 11:41:31 -0700
commit3546448338e76a52d4f86eb3680cb2934e22d89b (patch)
treea49964478359e20a4cffb9d5a32079f85947712e /drivers/hv
parent7f163a6fd957a85f7f66a129db1ad243a44399ee (diff)
drivers:hv: Move MMIO range picking from hyper_fb to hv_vmbus
This patch deletes the logic from hyperv_fb which picked a range of MMIO space for the frame buffer and adds new logic to hv_vmbus which picks ranges for child drivers. The new logic isn't quite the same as the old, as it considers more possible ranges. Signed-off-by: Jake Oshins <jakeo@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/vmbus_drv.c88
1 files changed, 84 insertions, 4 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index ee59e06c2194..8c3eaee8c54c 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -39,6 +39,7 @@
#include <asm/mshyperv.h>
#include <linux/notifier.h>
#include <linux/ptrace.h>
+#include <linux/screen_info.h>
#include <linux/kdebug.h>
#include "hyperv_vmbus.h"
@@ -103,7 +104,6 @@ static struct notifier_block hyperv_panic_block = {
};
struct resource *hyperv_mmio;
-EXPORT_SYMBOL_GPL(hyperv_mmio);
static int vmbus_exists(void)
{
@@ -891,8 +891,8 @@ err_cleanup:
}
/**
- * __vmbus_child_driver_register - Register a vmbus's driver
- * @drv: Pointer to driver structure you want to register
+ * __vmbus_child_driver_register() - Register a vmbus's driver
+ * @hv_driver: Pointer to driver structure you want to register
* @owner: owner module of the drv
* @mod_name: module name string
*
@@ -924,7 +924,8 @@ EXPORT_SYMBOL_GPL(__vmbus_driver_register);
/**
* vmbus_driver_unregister() - Unregister a vmbus's driver
- * @drv: Pointer to driver structure you want to un-register
+ * @hv_driver: Pointer to driver structure you want to
+ * un-register
*
* Un-register the given driver that was previous registered with a call to
* vmbus_driver_register()
@@ -1104,6 +1105,85 @@ static int vmbus_acpi_remove(struct acpi_device *device)
return 0;
}
+/**
+ * vmbus_allocate_mmio() - Pick a memory-mapped I/O range.
+ * @new: If successful, supplied a pointer to the
+ * allocated MMIO space.
+ * @device_obj: Identifies the caller
+ * @min: Minimum guest physical address of the
+ * allocation
+ * @max: Maximum guest physical address
+ * @size: Size of the range to be allocated
+ * @align: Alignment of the range to be allocated
+ * @fb_overlap_ok: Whether this allocation can be allowed
+ * to overlap the video frame buffer.
+ *
+ * This function walks the resources granted to VMBus by the
+ * _CRS object in the ACPI namespace underneath the parent
+ * "bridge" whether that's a root PCI bus in the Generation 1
+ * case or a Module Device in the Generation 2 case. It then
+ * attempts to allocate from the global MMIO pool in a way that
+ * matches the constraints supplied in these parameters and by
+ * that _CRS.
+ *
+ * Return: 0 on success, -errno on failure
+ */
+int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
+ resource_size_t min, resource_size_t max,
+ resource_size_t size, resource_size_t align,
+ bool fb_overlap_ok)
+{
+ struct resource *iter;
+ resource_size_t range_min, range_max, start, local_min, local_max;
+ const char *dev_n = dev_name(&device_obj->device);
+ u32 fb_end = screen_info.lfb_base + (screen_info.lfb_size << 1);
+ int i;
+
+ for (iter = hyperv_mmio; iter; iter = iter->sibling) {
+ if ((iter->start >= max) || (iter->end <= min))
+ continue;
+
+ range_min = iter->start;
+ range_max = iter->end;
+
+ /* If this range overlaps the frame buffer, split it into
+ two tries. */
+ for (i = 0; i < 2; i++) {
+ local_min = range_min;
+ local_max = range_max;
+ if (fb_overlap_ok || (range_min >= fb_end) ||
+ (range_max <= screen_info.lfb_base)) {
+ i++;
+ } else {
+ if ((range_min <= screen_info.lfb_base) &&
+ (range_max >= screen_info.lfb_base)) {
+ /*
+ * The frame buffer is in this window,
+ * so trim this into the part that
+ * preceeds the frame buffer.
+ */
+ local_max = screen_info.lfb_base - 1;
+ range_min = fb_end;
+ } else {
+ range_min = fb_end;
+ continue;
+ }
+ }
+
+ start = (local_min + align - 1) & ~(align - 1);
+ for (; start + size - 1 <= local_max; start += align) {
+ *new = request_mem_region_exclusive(start, size,
+ dev_n);
+ if (*new)
+ return 0;
+ }
+ }
+ }
+
+ return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
+
static int vmbus_acpi_add(struct acpi_device *device)
{
acpi_status result;