aboutsummaryrefslogtreecommitdiff
path: root/arch/parisc
AgeCommit message (Collapse)Author
2023-12-13parisc: Fix asm operand number out of range build error in bug tableHelge Deller
[ Upstream commit 487635756198cad563feb47539c6a37ea57f1dae ] Build is broken if CONFIG_DEBUG_BUGVERBOSE=n. Fix it be using the correct asm operand number. Signed-off-by: Helge Deller <deller@gmx.de> Reported-by: Linux Kernel Functional Testing <lkft@linaro.org> Fixes: fe76a1349f23 ("parisc: Use natural CPU alignment for bug_table") Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-12-13parisc: Reduce size of the bug_table on 64-bit kernel by halfHelge Deller
[ Upstream commit 43266838515d30dc0c45d5c7e6e7edacee6cce92 ] Enable GENERIC_BUG_RELATIVE_POINTERS which will store 32-bit relative offsets to the bug address and the source file name instead of 64-bit absolute addresses. This effectively reduces the size of the bug_table[] array by half on 64-bit kernels. Signed-off-by: Helge Deller <deller@gmx.de> Stable-dep-of: 487635756198 ("parisc: Fix asm operand number out of range build error in bug table") Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-12-08parisc: Mark altinstructions read-only and 32-bit alignedHelge Deller
commit 33f806da2df68606f77d7b892cd1298ba3d463e8 upstream. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Ensure 32-bit alignment on parisc unwind sectionHelge Deller
commit c9fcb2b65c2849e8ff3be23fd8828312fb68dc19 upstream. Make sure the .PARISC.unwind section will be 32-bit aligned. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Mark jump_table naturally alignedHelge Deller
commit 07eecff8ae78df7f28800484d31337e1f9bfca3a upstream. The jump_table stores two 32-bit words and one 32- (on 32-bit kernel) or one 64-bit word (on 64-bit kernel). Ensure that the last word is always 64-bit aligned on a 64-bit kernel by aligning the whole structure on sizeof(long). Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Drop the HP-UX ENOSYM and EREMOTERELEASE error codesHelge Deller
commit e5f3e299a2b1e9c3ece24a38adfc089aef307e8a upstream. Those return codes are only defined for the parisc architecture and are leftovers from when we wanted to be HP-UX compatible. They are not returned by any Linux kernel syscall but do trigger problems with the glibc strerrorname_np() and strerror() functions as reported in glibc issue #31080. There is no need to keep them, so simply remove them. Signed-off-by: Helge Deller <deller@gmx.de> Reported-by: Bruno Haible <bruno@clisp.org> Closes: https://sourceware.org/bugzilla/show_bug.cgi?id=31080 Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Mark lock_aligned variables 16-byte aligned on SMPHelge Deller
commit b28fc0d8739c03e7b6c44914a9d00d4c6dddc0ea upstream. On parisc we need 16-byte alignment for variables which are used for locking. Mark the __lock_aligned attribute acordingly so that the .data..lock_aligned section will get that alignment in the generated object files. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Use natural CPU alignment for bug_tableHelge Deller
commit fe76a1349f235969381832c83d703bc911021eb6 upstream. Make sure that the __bug_table section gets 32- or 64-bit aligned, depending if a 32- or 64-bit kernel is being built. Mark it non-writeable and use .blockz instead of the .org assembler directive to pad the struct. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Mark ex_table entries 32-bit aligned in uaccess.hHelge Deller
commit a80aeb86542a50aa8521729ea4cc731ee7174f03 upstream. Add an align statement to tell the linker that all ex_table entries and as such the whole ex_table section should be 32-bit aligned in vmlinux and modules. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-08parisc: Mark ex_table entries 32-bit aligned in assembly.hHelge Deller
commit e11d4cccd094a7cd4696c8c42e672c76c092dad5 upstream. Add an align statement to tell the linker that all ex_table entries and as such the whole ex_table section should be 32-bit aligned in vmlinux and modules. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-11-28parisc/pgtable: Do not drop upper 5 address bits of physical addressHelge Deller
commit 166b0110d1ee53290bd11618df6e3991c117495a upstream. When calculating the pfn for the iitlbt/idtlbt instruction, do not drop the upper 5 address bits. This doesn't seem to have an effect on physical hardware which uses less physical address bits, but in qemu the missing bits are visible. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-11-28parisc: Prevent booting 64-bit kernels on PA1.x machinesHelge Deller
commit a406b8b424fa01f244c1aab02ba186258448c36b upstream. Bail out early with error message when trying to boot a 64-bit kernel on 32-bit machines. This fixes the previous commit to include the check for true 64-bit kernels as well. Signed-off-by: Helge Deller <deller@gmx.de> Fixes: 591d2108f3abc ("parisc: Add runtime check to prevent PA2.0 kernels on PA1.x machines") Cc: <stable@vger.kernel.org> # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-11-28parisc/pdc: Add width field to struct pdc_modelHelge Deller
commit 6240553b52c475d9fc9674de0521b77e692f3764 upstream. PDC2.0 specifies the additional PSW-bit field. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-10parisc: Restore __ldcw_align for PA-RISC 2.0 processorsJohn David Anglin
commit 914988e099fc658436fbd7b8f240160c352b6552 upstream. Back in 2005, Kyle McMartin removed the 16-byte alignment for ldcw semaphores on PA 2.0 machines (CONFIG_PA20). This broke spinlocks on pre PA8800 processors. The main symptom was random faults in mmap'd memory (e.g., gcc compilations, etc). Unfortunately, the errata for this ldcw change is lost. The issue is the 16-byte alignment required for ldcw semaphore instructions can only be reduced to natural alignment when the ldcw operation can be handled coherently in cache. Only PA8800 and PA8900 processors actually support doing the operation in cache. Aligning the spinlock dynamically adds two integer instructions to each spinlock. Tested on rp3440, c8000 and a500. Signed-off-by: John David Anglin <dave.anglin@bell.net> Link: https://lore.kernel.org/linux-parisc/6b332788-2227-127f-ba6d-55e99ecf4ed8@bell.net/T/#t Link: https://lore.kernel.org/linux-parisc/20050609050702.GB4641@roadwarrior.mcmartin.ca/ Cc: stable@vger.kernel.org Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-10parisc: Fix crash with nr_cpus=1 optionHelge Deller
commit d3b3c637e4eb8d3bbe53e5692aee66add72f9851 upstream. John David Anglin reported that giving "nr_cpus=1" on the command line causes a crash, while "maxcpus=1" works. Reported-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # v5.18+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-10-06parisc: irq: Make irq_stack_union static to avoid sparse warningHelge Deller
[ Upstream commit b1bef1388c427cdad7331a9c8eb4ebbbe5b954b0 ] Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-10-06parisc: drivers: Fix sparse warningHelge Deller
[ Upstream commit b137b9d60b8add5620a06c687a71ce18776730b0 ] Fix "warning: directive in macro's argument list" warning. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-10-06parisc: sba: Fix compile warning wrt list of SBA devicesHelge Deller
[ Upstream commit eb3255ee8f6f4691471a28fbf22db5e8901116cd ] Fix this makecheck warning: drivers/parisc/sba_iommu.c:98:19: warning: symbol 'sba_list' was not declared. Should it be static? Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-09-19parisc: led: Fix LAN receive and transmit LEDsHelge Deller
commit 4db89524b084f712a887256391fc19d9f66c8e55 upstream. Fix the LAN receive and LAN transmit LEDs, which where swapped up to now. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-13parisc: Fix /proc/cpuinfo output for lscpuHelge Deller
commit 9f5ba4b3e1b3c123eeca5d2d09161e8720048b5c upstream. The lscpu command is broken since commit cab56b51ec0e ("parisc: Fix device names in /proc/iomem") added the PA pathname to all PA devices, includig the CPUs. lscpu parses /proc/cpuinfo and now believes it found different CPU types since every CPU is listed with an unique identifier (PA pathname). Fix this problem by simply dropping the PA pathname when listing the CPUs in /proc/cpuinfo. There is no need to show the pathname in this procfs file. Fixes: cab56b51ec0e ("parisc: Fix device names in /proc/iomem") Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v4.9+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-02parisc: sys_parisc: parisc_personality() is called from asm codeHelge Deller
commit b5d89408b9fb21258f7c371d6d48a674f60f7181 upstream. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-02parisc: Cleanup mmap implementation regarding color alignmentJohn David Anglin
commit 567b35159e76997e95b643b9a8a5d9d2198f2522 upstream. This change simplifies the randomization of file mapping regions. It reworks the code to remove duplication. The flow is now similar to that for mips. Finally, we consistently use the do_color_align variable to determine when color alignment is needed. Tested on rp3440. Signed-off-by: John David Anglin <dave.anglin@bell.net> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-08init: Remove check_bugs() leftoversThomas Gleixner
commit 61235b24b9cb37c13fcad5b9596d59a1afdcec30 upstream Everything is converted over to arch_cpu_finalize_init(). Remove the check_bugs() leftovers including the empty stubs in asm-generic, alpha, parisc, powerpc and xtensa. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Link: https://lore.kernel.org/r/20230613224545.553215951@linutronix.de Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-07-01parisc: fix expand_stack() conversionLinus Torvalds
commit ea3f8272876f2958463992f6736ab690fde7fa9c upstream. In commit 8d7071af8907 ("mm: always expand the stack with the mmap write lock held") I tried to deal with the remaining odd page fault handling cases. The oddest one is ia64, which has stacks that grow both up and down. And because ia64 was _so_ odd, I asked people to verify the end result. But a close second oddity is parisc, which is the only one that has a main stack growing up (our "CONFIG_STACK_GROWSUP" config option). But it looked obvious enough that I didn't worry about it. I should have worried a bit more. Not because it was particularly complex, but because I just used the wrong variable name. The previous vma isn't called "prev", it's called "prev_vma". Blush. Fixes: 8d7071af8907 ("mm: always expand the stack with the mmap write lock held") Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-07-01mm: always expand the stack with the mmap write lock heldLinus Torvalds
commit 8d7071af890768438c14db6172cc8f9f4d04e184 upstream This finishes the job of always holding the mmap write lock when extending the user stack vma, and removes the 'write_locked' argument from the vm helper functions again. For some cases, we just avoid expanding the stack at all: drivers and page pinning really shouldn't be extending any stacks. Let's see if any strange users really wanted that. It's worth noting that architectures that weren't converted to the new lock_mm_and_find_vma() helper function are left using the legacy "expand_stack()" function, but it has been changed to drop the mmap_lock and take it for writing while expanding the vma. This makes it fairly straightforward to convert the remaining architectures. As a result of dropping and re-taking the lock, the calling conventions for this function have also changed, since the old vma may no longer be valid. So it will now return the new vma if successful, and NULL - and the lock dropped - if the area could not be extended. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> [6.1: Patch drivers/iommu/io-pgfault.c instead] Signed-off-by: Samuel Mendoza-Jonas <samjonas@amazon.com> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-06-21parisc: Delete redundant register definitions in <asm/assembly.h>Ben Hutchings
commit b5b2a02bcaac7c287694aa0db4837a07bf178626 upstream. We define sp and ipsw in <asm/asmregs.h> using ".reg", and when using current binutils (snapshot 2.40.50.20230611) the definitions in <asm/assembly.h> using "=" conflict with those: arch/parisc/include/asm/assembly.h: Assembler messages: arch/parisc/include/asm/assembly.h:93: Error: symbol `sp' is already defined arch/parisc/include/asm/assembly.h:95: Error: symbol `ipsw' is already defined Delete the duplicate definitions in <asm/assembly.h>. Also delete the definition of gp, which isn't used anywhere. Signed-off-by: Ben Hutchings <benh@debian.org> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-06-21parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu()Helge Deller
[ Upstream commit 59fa12646d9f56c842b4d5b6418ed77af625c588 ] Add comment in arch_sync_dma_for_device() and handle the direction flag in arch_sync_dma_for_cpu(). When receiving data from the device (DMA_FROM_DEVICE) unconditionally purge the data cache in arch_sync_dma_for_cpu(). Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-05-30parisc: Handle kprobes breakpoints only in kernel contextHelge Deller
commit df419492e428b6a2bce98d0f613c58a13da6666c upstream. The kernel kprobes break instructions should only be handled when running in kernel context. Cc: <stable@vger.kernel.org> # v5.18+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-30parisc: Enable LOCKDEP supportHelge Deller
commit adf8e96a7ea670d45b5de7594acc67e8f4787ae6 upstream. Cc: <stable@vger.kernel.org> # v6.0+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-30parisc: Allow to reboot machine after system haltHelge Deller
commit 2028315cf59bb899a5ac7e87dc48ecb8fac7ac24 upstream. In case a machine can't power-off itself on system shutdown, allow the user to reboot it by pressing the RETURN key. Cc: <stable@vger.kernel.org> # v4.14+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-30parisc: Fix flush_dcache_page() for usage from irq contextHelge Deller
commit 61e150fb310729c98227a5edf6e4a3619edc3702 upstream. Since at least kernel 6.1, flush_dcache_page() is called with IRQs disabled, e.g. from aio_complete(). But the current implementation for flush_dcache_page() on parisc unintentionally re-enables IRQs, which may lead to deadlocks. Fix it by using xa_lock_irqsave() and xa_unlock_irqrestore() for the flush_dcache_mmap_*lock() macros instead. Cc: linux-parisc@vger.kernel.org Cc: stable@kernel.org # 5.18+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-30parisc: Handle kgdb breakpoints only in kernel contextHelge Deller
commit 6888ff04e37d01295620a73f3f7efbc79f6ef152 upstream. The kernel kgdb break instructions should only be handled when running in kernel context. Cc: <stable@vger.kernel.org> # v5.4+ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-30parisc: Use num_present_cpus() in alternative patching codeHelge Deller
commit b6405f0829d7b1dd926ba3ca5f691cab835abfaa upstream. When patching the kernel code some alternatives depend on SMP vs. !SMP. Use the value of num_present_cpus() instead of num_online_cpus() to decide, otherwise we may run into issues if and additional CPU is enabled after having loaded a module while only one CPU was enabled. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v6.1+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-24parisc: Replace regular spinlock with spin_trylock on panic pathGuilherme G. Piccoli
[ Upstream commit 829632dae8321787525ee37dc4828bbe6edafdae ] The panic notifiers' callbacks execute in an atomic context, with interrupts/preemption disabled, and all CPUs not running the panic function are off, so it's very dangerous to wait on a regular spinlock, there's a risk of deadlock. Refactor the panic notifier of parisc/power driver to make use of spin_trylock - for that, we've added a second version of the soft-power function. Also, some comments were reorganized and trailing white spaces, useless header inclusion and blank lines were removed. Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jeroen Roovers <jer@xs4all.nl> Acked-by: Helge Deller <deller@gmx.de> # parisc Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-05-11parisc: Ensure page alignment in flush functionsHelge Deller
commit d755bd2caeb47fd806e12399fe8b56798fa5d2cc upstream. Matthew Wilcox noticed, that if ARCH_HAS_FLUSH_ON_KUNMAP is defined (which is the case for PA-RISC), __kunmap_local() calls kunmap_flush_on_unmap(), which may call the parisc flush functions with a non-page-aligned address and thus the page might not be fully flushed. This patch ensures that flush_kernel_dcache_page_asm() and flush_kernel_dcache_page_asm() will always operate on page-aligned addresses. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-05-11parisc: Fix argument pointer in real64_call_asm()Helge Deller
commit 6e3220ba3323a2c24be834aebf5d6e9f89d0993f upstream. Fix the argument pointer (ap) to point to real-mode memory instead of virtual memory. It's interesting that this issue hasn't shown up earlier, as this could have happened with any 64-bit PDC ROM code. I just noticed it because I suddenly faced a HPMC while trying to execute the 64-bit STI ROM code of an Visualize-FXe graphics card for the STI text console. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-02-09parisc: Wire up PTRACE_GETREGS/PTRACE_SETREGS for compat caseHelge Deller
commit 316f1f42b5cc1d95124c1f0387c867c1ba7b6d0e upstream. Wire up the missing ptrace requests PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS when running 32-bit applications on 64-bit kernels. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # 4.7+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-02-09parisc: Replace hardcoded value with PRIV_USER constant in ptrace.cHelge Deller
commit 3f0c17809a098d3f0c1ec83f1fb3ca61638d3dcd upstream. Prefer usage of the PRIV_USER constant over the hard-coded value to set the lowest 2 bits for the userspace privilege. Signed-off-by: Helge Deller <deller@gmx.de> Cc: stable@vger.kernel.org # 5.16+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-02-09parisc: Fix return code of pdc_iodc_print()Helge Deller
commit 5d1335dabb3c493a3d6d5b233953b6ac7b6c1ff2 upstream. There is an off-by-one if the printed string includes a new-line char. Cc: stable@vger.kernel.org Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-14parisc: Align parisc MADV_XXX constants with all other architecturesHelge Deller
commit 71bdea6f798b425bc0003780b13e3fdecb16a010 upstream. Adjust some MADV_XXX constants to be in sync what their values are on all other platforms. There is currently no reason to have an own numbering on parisc, but it requires workarounds in many userspace sources (e.g. glibc, qemu, ...) - which are often forgotten and thus introduce bugs and different behaviour on parisc. A wrapper avoids an ABI breakage for existing userspace applications by translating any old values to the new ones, so this change allows us to move over all programs to the new ABI over time. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-07parisc: Drop PMD_SHIFT from calculation in pgtable.hHelge Deller
commit fe94cb1a614d2df2764d49ac959d8b7e4cb98e15 upstream. PMD_SHIFT isn't defined if CONFIG_PGTABLE_LEVELS == 3, and as such the kernel test robot found this warning: In file included from include/linux/pgtable.h:6, from arch/parisc/kernel/head.S:23: arch/parisc/include/asm/pgtable.h:169:32: warning: "PMD_SHIFT" is not defined, evaluates to 0 [-Wundef] 169 | #if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT) Avoid the warning by using PLD_SHIFT and BITS_PER_PTE. Signed-off-by: Helge Deller <deller@gmx.de> Reported-by: kernel test robot <lkp@intel.com> Cc: <stable@vger.kernel.org> # 6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-07parisc: Drop duplicate kgdb_pdc consoleHelge Deller
commit 7e6652c79ecd74e1112500668d956367dc3772a5 upstream. The kgdb console is already implemented and registered in pdc_cons.c, so the duplicate code can be dropped. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # 6.1+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-07parisc: Add missing FORCE prerequisites in MakefileHelge Deller
commit 9086e6017957c5cd6ea28d94b70e0d513d6b7800 upstream. Fix those make warnings: arch/parisc/kernel/vdso32/Makefile:30: FORCE prerequisite is missing arch/parisc/kernel/vdso64/Makefile:30: FORCE prerequisite is missing Add the missing FORCE prerequisites for all build targets identified by "make help". Fixes: e1f86d7b4b2a5213 ("kbuild: warn if FORCE is missing for if_changed(_dep,_rule) and filechk") Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # 5.18+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-07parisc: Fix locking in pdc_iodc_print() firmware callHelge Deller
commit 7236aae5f81f3efbd93d0601e74fc05994bc2580 upstream. Utilize pdc_lock spinlock to protect parallel modifications of the iodc_dbuf[] buffer, check length to prevent buffer overflow of iodc_dbuf[], drop the iodc_retbuf[] buffer and fix some wrong indentings. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # 6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-01-07parisc: Drop locking in pdc console codeHelge Deller
commit 7dc4dbfe750e1f18c511e73c8ed114da8de9ff85 upstream. No need to have specific locking for console I/O since the PDC functions provide an own locking. Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # 6.1+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-10-31parisc: Avoid printing the hardware path twiceHelge Deller
Avoid that the hardware path is shown twice in the kernel log, and clean up the output of the version numbers to show up in the same order as they are listed in the hardware database in the hardware.c file. Additionally, optimize the memory footprint of the hardware database and mark some code as init code. Fixes: cab56b51ec0e ("parisc: Fix device names in /proc/iomem") Signed-off-by: Helge Deller <deller@gmx.de> Cc: <stable@vger.kernel.org> # v4.9+
2022-10-21parisc: Use signed char for hardware path in pdc.hHelge Deller
Clean up the struct for hardware_path and drop the struct device_path with a proper assignment of bc[] and mod members as signed chars. This patch prepares for the kbuild change from Jason A. Donenfeld to treat char as always unsigned. Signed-off-by: Helge Deller <deller@gmx.de> Cc: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-16Merge tag 'random-6.1-rc1-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/crng/random Pull more random number generator updates from Jason Donenfeld: "This time with some large scale treewide cleanups. The intent of this pull is to clean up the way callers fetch random integers. The current rules for doing this right are: - If you want a secure or an insecure random u64, use get_random_u64() - If you want a secure or an insecure random u32, use get_random_u32() The old function prandom_u32() has been deprecated for a while now and is just a wrapper around get_random_u32(). Same for get_random_int(). - If you want a secure or an insecure random u16, use get_random_u16() - If you want a secure or an insecure random u8, use get_random_u8() - If you want secure or insecure random bytes, use get_random_bytes(). The old function prandom_bytes() has been deprecated for a while now and has long been a wrapper around get_random_bytes() - If you want a non-uniform random u32, u16, or u8 bounded by a certain open interval maximum, use prandom_u32_max() I say "non-uniform", because it doesn't do any rejection sampling or divisions. Hence, it stays within the prandom_*() namespace, not the get_random_*() namespace. I'm currently investigating a "uniform" function for 6.2. We'll see what comes of that. By applying these rules uniformly, we get several benefits: - By using prandom_u32_max() with an upper-bound that the compiler can prove at compile-time is ≤65536 or ≤256, internally get_random_u16() or get_random_u8() is used, which wastes fewer batched random bytes, and hence has higher throughput. - By using prandom_u32_max() instead of %, when the upper-bound is not a constant, division is still avoided, because prandom_u32_max() uses a faster multiplication-based trick instead. - By using get_random_u16() or get_random_u8() in cases where the return value is intended to indeed be a u16 or a u8, we waste fewer batched random bytes, and hence have higher throughput. This series was originally done by hand while I was on an airplane without Internet. Later, Kees and I worked on retroactively figuring out what could be done with Coccinelle and what had to be done manually, and then we split things up based on that. So while this touches a lot of files, the actual amount of code that's hand fiddled is comfortably small" * tag 'random-6.1-rc1-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random: prandom: remove unused functions treewide: use get_random_bytes() when possible treewide: use get_random_u32() when possible treewide: use get_random_{u8,u16}() when possible, part 2 treewide: use get_random_{u8,u16}() when possible, part 1 treewide: use prandom_u32_max() when possible, part 2 treewide: use prandom_u32_max() when possible, part 1
2022-10-14Merge tag 'parisc-for-6.1-1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux Pull parisc updates from Helge Deller: "Fixes: - When we added basic vDSO support in kernel 5.18 we introduced a bug which prevented a mmap() of graphic card memory. This is because we used the DMB (data memory break trap bit) page flag as special-bit, but missed to clear that bit when loading the TLB. - Graphics card memory size was not correctly aligned - Spelling fixes (from Colin Ian King) Enhancements: - PDC console (which uses firmware calls) now rewritten as early console - Reduced size of alternative tables" * tag 'parisc-for-6.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Fix spelling mistake "mis-match" -> "mismatch" in eisa driver parisc: Fix userspace graphics card breakage due to pgtable special bit parisc: fbdev/stifb: Align graphics memory size to 4MB parisc: Convert PDC console to an early console parisc: Reduce kernel size by packing alternative tables
2022-10-14parisc: Fix userspace graphics card breakage due to pgtable special bitHelge Deller
Commit df24e1783e6e ("parisc: Add vDSO support") introduced the vDSO support, for which a _PAGE_SPECIAL page table flag was needed. Since we wanted to keep every page table entry in 32-bits, this patch re-used the existing - but yet unused - _PAGE_DMB flag (which triggers a hardware break if a page is accessed) to store the special bit. But when graphics card memory is mmapped into userspace, the kernel uses vm_iomap_memory() which sets the the special flag. So, with the DMB bit set, every access to the graphics memory now triggered a hardware exception and segfaulted the userspace program. Fix this breakage by dropping the DMB bit when writing the page protection bits to the CPU TLB. In addition this patch adds a small optimization: if huge pages aren't configured (which is at least the case for 32-bit kernels), then the special bit is stored in the hpage (HUGE PAGE) bit instead. That way we can skip to reset the DMB bit. Fixes: df24e1783e6e ("parisc: Add vDSO support") Cc: <stable@vger.kernel.org> # 5.18+ Signed-off-by: Helge Deller <deller@gmx.de>