mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
4a20799d11
Memtest is a simple feature which fills the memory with a given set of patterns and validates memory contents, if bad memory regions is detected it reserves them via memblock API. Since memblock API is widely used by other architectures this feature can be enabled outside of x86 world. This patch set promotes memtest to live under generic mm umbrella and enables memtest feature for arm/arm64. It was reported that this patch set was useful for tracking down an issue with some errant DMA on an arm64 platform. This patch (of 6): There is nothing platform dependent in the core memtest code, so other platforms might benefit from this feature too. [linux@roeck-us.net: MEMTEST depends on MEMBLOCK] Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
119 lines
3 KiB
C
119 lines
3 KiB
C
#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/pfn.h>
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#include <linux/memblock.h>
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static u64 patterns[] __initdata = {
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/* The first entry has to be 0 to leave memtest with zeroed memory */
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0,
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0xffffffffffffffffULL,
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0x5555555555555555ULL,
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0xaaaaaaaaaaaaaaaaULL,
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0x1111111111111111ULL,
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0x2222222222222222ULL,
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0x4444444444444444ULL,
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0x8888888888888888ULL,
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0x3333333333333333ULL,
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0x6666666666666666ULL,
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0x9999999999999999ULL,
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0xccccccccccccccccULL,
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0x7777777777777777ULL,
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0xbbbbbbbbbbbbbbbbULL,
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0xddddddddddddddddULL,
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0xeeeeeeeeeeeeeeeeULL,
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0x7a6c7258554e494cULL, /* yeah ;-) */
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};
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static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
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{
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printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n",
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(unsigned long long) pattern,
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(unsigned long long) start_bad,
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(unsigned long long) end_bad);
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memblock_reserve(start_bad, end_bad - start_bad);
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}
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static void __init memtest(u64 pattern, u64 start_phys, u64 size)
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{
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u64 *p, *start, *end;
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u64 start_bad, last_bad;
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u64 start_phys_aligned;
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const size_t incr = sizeof(pattern);
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start_phys_aligned = ALIGN(start_phys, incr);
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start = __va(start_phys_aligned);
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end = start + (size - (start_phys_aligned - start_phys)) / incr;
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start_bad = 0;
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last_bad = 0;
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for (p = start; p < end; p++)
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*p = pattern;
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for (p = start; p < end; p++, start_phys_aligned += incr) {
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if (*p == pattern)
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continue;
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if (start_phys_aligned == last_bad + incr) {
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last_bad += incr;
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continue;
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}
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if (start_bad)
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reserve_bad_mem(pattern, start_bad, last_bad + incr);
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start_bad = last_bad = start_phys_aligned;
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}
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if (start_bad)
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reserve_bad_mem(pattern, start_bad, last_bad + incr);
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}
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static void __init do_one_pass(u64 pattern, u64 start, u64 end)
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{
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u64 i;
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phys_addr_t this_start, this_end;
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for_each_free_mem_range(i, NUMA_NO_NODE, &this_start, &this_end, NULL) {
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this_start = clamp_t(phys_addr_t, this_start, start, end);
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this_end = clamp_t(phys_addr_t, this_end, start, end);
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if (this_start < this_end) {
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printk(KERN_INFO " %010llx - %010llx pattern %016llx\n",
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(unsigned long long)this_start,
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(unsigned long long)this_end,
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(unsigned long long)cpu_to_be64(pattern));
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memtest(pattern, this_start, this_end - this_start);
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}
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}
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}
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/* default is disabled */
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static int memtest_pattern __initdata;
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static int __init parse_memtest(char *arg)
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{
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if (arg)
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memtest_pattern = simple_strtoul(arg, NULL, 0);
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else
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memtest_pattern = ARRAY_SIZE(patterns);
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return 0;
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}
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early_param("memtest", parse_memtest);
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void __init early_memtest(unsigned long start, unsigned long end)
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{
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unsigned int i;
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unsigned int idx = 0;
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if (!memtest_pattern)
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return;
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printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern);
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for (i = memtest_pattern-1; i < UINT_MAX; --i) {
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idx = i % ARRAY_SIZE(patterns);
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do_one_pass(patterns[idx], start, end);
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}
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}
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