mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 02:06:49 +07:00
[ARM] S3C: Split the resume memory check code from pm.c
Split the optional memory check code out of the pm.c file as it is quite a big #ifdef block and as-such can be moved out and simply compiled when the configuration is set. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks
parent
6419711a16
commit
549c7e33ae
@ -21,6 +21,7 @@ obj-y += gpio-config.o
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# PM support
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obj-$(CONFIG_PM) += pm.o
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obj-$(CONFIG_S3C2410_PM_CHECK) += pm-check.o
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# devices
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@ -101,3 +101,15 @@ extern void s3c_pm_dbg(const char *msg, ...);
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#else
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#define S3C_PMDBG(fmt...) printk(KERN_DEBUG fmt)
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#endif
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/* suspend memory checking */
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#ifdef CONFIG_S3C2410_PM_CHECK
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extern void s3c_pm_check_prepare(void);
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extern void s3c_pm_check_restore(void);
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extern void s3c_pm_check_store(void);
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#else
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#define s3c_pm_check_prepare() do { } while(0)
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#define s3c_pm_check_restore() do { } while(0)
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#define s3c_pm_check_store() do { } while(0)
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#endif
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220
arch/arm/plat-s3c/pm-check.c
Normal file
220
arch/arm/plat-s3c/pm-check.c
Normal file
@ -0,0 +1,220 @@
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/* linux/arch/arm/plat-s3c/pm-check.c
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* originally in linux/arch/arm/plat-s3c24xx/pm.c
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*
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* Copyright (c) 2004,2006,2008 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 corruptiuon check.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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 <plat/pm.h>
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#if CONFIG_S3C2410_PM_CHECK_CHUNKSIZE < 1
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#error CONFIG_S3C2410_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_S3C2410_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_S3C2410_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_MEM) &&
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strcmp(ptr->name, "System RAM") == 0) {
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S3C_PMDBG("Found system RAM at %08lx..%08lx\n",
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ptr->start, 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)(res->end - res->start)+1;
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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", res->start, 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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void *save_at = phys_to_virt(s3c_sleep_save_phys);
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unsigned long addr;
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unsigned long left;
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void *ptr;
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u32 calc;
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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, 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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if (in_region(ptr, left, save_at, 32*4 )) {
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S3C_PMDBG("skipping %08lx, has save 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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kfree(crcs);
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crcs = NULL;
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}
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}
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@ -31,8 +31,6 @@
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/interrupt.h>
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#include <linux/crc32.h>
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#include <linux/ioport.h>
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#include <linux/serial_core.h>
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#include <linux/io.h>
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@ -159,200 +157,6 @@ static void s3c2410_pm_debug_init(void)
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static struct sleep_save uart_save[] = {};
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#endif
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#if defined(CONFIG_S3C2410_PM_CHECK) && CONFIG_S3C2410_PM_CHECK_CHUNKSIZE != 0
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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_S3C2410_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_S3C2410_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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/* s3c2410_pm_run_res
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*
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* go thorugh the given resource list, and look for system ram
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*/
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static void s3c2410_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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s3c2410_pm_run_res(ptr->child, fn, arg);
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if ((ptr->flags & IORESOURCE_MEM) &&
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strcmp(ptr->name, "System RAM") == 0) {
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S3C_PMDBG("Found system RAM at %08lx..%08lx\n",
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ptr->start, 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 s3c2410_pm_run_sysram(run_fn_t fn, u32 *arg)
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{
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s3c2410_pm_run_res(&iomem_resource, fn, arg);
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}
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static u32 *s3c2410_pm_countram(struct resource *res, u32 *val)
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{
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u32 size = (u32)(res->end - res->start)+1;
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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", res->start, 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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/* s3c2410_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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static void s3c2410_pm_check_prepare(void)
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{
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crc_size = 0;
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s3c2410_pm_run_sysram(s3c2410_pm_countram, &crc_size);
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S3C_PMDBG("s3c2410_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 *s3c2410_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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/* s3c2410_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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static void s3c2410_pm_check_store(void)
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{
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if (crcs != NULL)
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s3c2410_pm_run_sysram(s3c2410_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 contatins 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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static u32 *s3c2410_pm_runcheck(struct resource *res, u32 *val)
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{
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void *save_at = phys_to_virt(s3c_sleep_save_phys);
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unsigned long addr;
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unsigned long left;
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void *ptr;
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u32 calc;
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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, 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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if (in_region(ptr, left, save_at, 32*4 )) {
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S3C_PMDBG("skipping %08lx, has save 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 PFX "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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/* s3c2410_pm_check_restore
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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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static void s3c2410_pm_check_restore(void)
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{
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if (crcs != NULL) {
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s3c2410_pm_run_sysram(s3c2410_pm_runcheck, crcs);
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kfree(crcs);
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crcs = NULL;
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}
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}
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#else
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#define s3c2410_pm_check_prepare() do { } while(0)
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#define s3c2410_pm_check_restore() do { } while(0)
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#define s3c2410_pm_check_store() do { } while(0)
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#endif
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/* s3c2410_pm_show_resume_irqs
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*
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* print any IRQs asserted at resume time (ie, we woke from)
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@ -372,13 +176,13 @@ static void s3c2410_pm_show_resume_irqs(int start, unsigned long which,
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}
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}
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/* s3c2410_pm_check_resume_pin
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/* s3c_pm_check_resume_pin
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*
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* check to see if the pin is configured correctly for sleep mode, and
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* make any necessary adjustments if it is not
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*/
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static void s3c2410_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
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static void s3c_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
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{
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unsigned long irqstate;
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unsigned long pinstate;
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@ -417,11 +221,11 @@ static void s3c2410_pm_configure_extint(void)
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*/
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for (pin = S3C2410_GPF0; pin <= S3C2410_GPF7; pin++) {
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s3c2410_pm_check_resume_pin(pin, pin - S3C2410_GPF0);
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s3c_pm_check_resume_pin(pin, pin - S3C2410_GPF0);
|
||||
}
|
||||
|
||||
for (pin = S3C2410_GPG0; pin <= S3C2410_GPG7; pin++) {
|
||||
s3c2410_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8);
|
||||
s3c_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8);
|
||||
}
|
||||
}
|
||||
|
||||
@ -642,7 +446,7 @@ static int s3c2410_pm_enter(suspend_state_t state)
|
||||
|
||||
/* prepare check area if configured */
|
||||
|
||||
s3c2410_pm_check_prepare();
|
||||
s3c_pm_check_prepare();
|
||||
|
||||
/* store the physical address of the register recovery block */
|
||||
|
||||
@ -681,7 +485,7 @@ static int s3c2410_pm_enter(suspend_state_t state)
|
||||
|
||||
flush_cache_all();
|
||||
|
||||
s3c2410_pm_check_store();
|
||||
s3c_pm_check_store();
|
||||
|
||||
/* send the cpu to sleep... */
|
||||
|
||||
@ -723,7 +527,7 @@ static int s3c2410_pm_enter(suspend_state_t state)
|
||||
|
||||
S3C_PMDBG("post sleep, preparing to return\n");
|
||||
|
||||
s3c2410_pm_check_restore();
|
||||
s3c_pm_check_restore();
|
||||
|
||||
/* ok, let's return from sleep */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user