![Krzysztof Kozlowski](/assets/img/avatar_default.png)
Replace GPL license statements with SPDX license identifiers (GPL-1.0+, GPL-2.0 and GPL-2.0+). Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
234 lines
5.3 KiB
C
234 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// originally in linux/arch/arm/plat-s3c24xx/pm.c
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//
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// Copyright (c) 2004-2008 Simtec Electronics
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// http://armlinux.simtec.co.uk
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// Ben Dooks <ben@simtec.co.uk>
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//
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// S3C Power Mangament - suspend/resume memory corruption check.
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#include <linux/kernel.h>
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#include <linux/suspend.h>
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#include <linux/init.h>
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#include <linux/crc32.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <plat/pm-common.h>
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#if CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE < 1
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#error CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE must be a positive non-zero value
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#endif
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/* suspend checking code...
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*
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* this next area does a set of crc checks over all the installed
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* memory, so the system can verify if the resume was ok.
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*
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* CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE defines the block-size for the CRC,
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* increasing it will mean that the area corrupted will be less easy to spot,
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* and reducing the size will cause the CRC save area to grow
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*/
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#define CHECK_CHUNKSIZE (CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE * 1024)
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static u32 crc_size; /* size needed for the crc block */
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static u32 *crcs; /* allocated over suspend/resume */
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typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg);
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/* s3c_pm_run_res
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*
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* go through the given resource list, and look for system ram
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*/
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static void s3c_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg)
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{
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while (ptr != NULL) {
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if (ptr->child != NULL)
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s3c_pm_run_res(ptr->child, fn, arg);
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if ((ptr->flags & IORESOURCE_SYSTEM_RAM)
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== IORESOURCE_SYSTEM_RAM) {
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S3C_PMDBG("Found system RAM at %08lx..%08lx\n",
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(unsigned long)ptr->start,
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(unsigned long)ptr->end);
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arg = (fn)(ptr, arg);
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}
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ptr = ptr->sibling;
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}
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}
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static void s3c_pm_run_sysram(run_fn_t fn, u32 *arg)
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{
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s3c_pm_run_res(&iomem_resource, fn, arg);
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}
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static u32 *s3c_pm_countram(struct resource *res, u32 *val)
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{
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u32 size = (u32)resource_size(res);
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size += CHECK_CHUNKSIZE-1;
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size /= CHECK_CHUNKSIZE;
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S3C_PMDBG("Area %08lx..%08lx, %d blocks\n",
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(unsigned long)res->start, (unsigned long)res->end, size);
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*val += size * sizeof(u32);
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return val;
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}
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/* s3c_pm_prepare_check
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*
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* prepare the necessary information for creating the CRCs. This
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* must be done before the final save, as it will require memory
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* allocating, and thus touching bits of the kernel we do not
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* know about.
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*/
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void s3c_pm_check_prepare(void)
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{
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crc_size = 0;
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s3c_pm_run_sysram(s3c_pm_countram, &crc_size);
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S3C_PMDBG("s3c_pm_prepare_check: %u checks needed\n", crc_size);
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crcs = kmalloc(crc_size+4, GFP_KERNEL);
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if (crcs == NULL)
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printk(KERN_ERR "Cannot allocated CRC save area\n");
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}
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static u32 *s3c_pm_makecheck(struct resource *res, u32 *val)
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{
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unsigned long addr, left;
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for (addr = res->start; addr < res->end;
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addr += CHECK_CHUNKSIZE) {
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left = res->end - addr;
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if (left > CHECK_CHUNKSIZE)
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left = CHECK_CHUNKSIZE;
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*val = crc32_le(~0, phys_to_virt(addr), left);
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val++;
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}
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return val;
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}
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/* s3c_pm_check_store
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*
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* compute the CRC values for the memory blocks before the final
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* sleep.
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*/
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void s3c_pm_check_store(void)
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{
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if (crcs != NULL)
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s3c_pm_run_sysram(s3c_pm_makecheck, crcs);
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}
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/* in_region
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*
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* return TRUE if the area defined by ptr..ptr+size contains the
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* what..what+whatsz
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*/
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static inline int in_region(void *ptr, int size, void *what, size_t whatsz)
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{
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if ((what+whatsz) < ptr)
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return 0;
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if (what > (ptr+size))
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return 0;
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return 1;
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}
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/**
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* s3c_pm_runcheck() - helper to check a resource on restore.
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* @res: The resource to check
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* @vak: Pointer to list of CRC32 values to check.
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*
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* Called from the s3c_pm_check_restore() via s3c_pm_run_sysram(), this
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* function runs the given memory resource checking it against the stored
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* CRC to ensure that memory is restored. The function tries to skip as
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* many of the areas used during the suspend process.
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*/
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static u32 *s3c_pm_runcheck(struct resource *res, u32 *val)
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{
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unsigned long addr;
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unsigned long left;
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void *stkpage;
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void *ptr;
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u32 calc;
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stkpage = (void *)((u32)&calc & ~PAGE_MASK);
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for (addr = res->start; addr < res->end;
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addr += CHECK_CHUNKSIZE) {
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left = res->end - addr;
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if (left > CHECK_CHUNKSIZE)
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left = CHECK_CHUNKSIZE;
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ptr = phys_to_virt(addr);
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if (in_region(ptr, left, stkpage, 4096)) {
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S3C_PMDBG("skipping %08lx, has stack in\n", addr);
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goto skip_check;
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}
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if (in_region(ptr, left, crcs, crc_size)) {
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S3C_PMDBG("skipping %08lx, has crc block in\n", addr);
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goto skip_check;
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}
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/* calculate and check the checksum */
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calc = crc32_le(~0, ptr, left);
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if (calc != *val) {
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printk(KERN_ERR "Restore CRC error at "
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"%08lx (%08x vs %08x)\n", addr, calc, *val);
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S3C_PMDBG("Restore CRC error at %08lx (%08x vs %08x)\n",
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addr, calc, *val);
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}
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skip_check:
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val++;
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}
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return val;
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}
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/**
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* s3c_pm_check_restore() - memory check called on resume
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*
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* check the CRCs after the restore event and free the memory used
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* to hold them
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*/
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void s3c_pm_check_restore(void)
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{
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if (crcs != NULL)
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s3c_pm_run_sysram(s3c_pm_runcheck, crcs);
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}
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/**
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* s3c_pm_check_cleanup() - free memory resources
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*
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* Free the resources that where allocated by the suspend
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* memory check code. We do this separately from the
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* s3c_pm_check_restore() function as we cannot call any
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* functions that might sleep during that resume.
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*/
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void s3c_pm_check_cleanup(void)
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{
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kfree(crcs);
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crcs = NULL;
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}
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