From 40823f737e5bd186a1156fb1c28f360260e1e084 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 25 Feb 2009 11:26:18 +0100 Subject: x86: memtest: reuse test patterns when memtest parameter exceeds number of available patterns Impact: fix unexpected behaviour when pattern number is out of range Current implementation provides 4 patterns for memtest. The code doesn't check whether the memtest parameter value exceeds the maximum pattern number. Instead the memtest code pretends to test with non-existing patterns, e.g. when booting with memtest=10 I've observed the following ... early_memtest: pattern num 10 0000001000 - 0000006000 pattern 0 ... 0000001000 - 0000006000 pattern 1 ... 0000001000 - 0000006000 pattern 2 ... 0000001000 - 0000006000 pattern 3 ... 0000001000 - 0000006000 pattern 4 ... 0000001000 - 0000006000 pattern 5 ... 0000001000 - 0000006000 pattern 6 ... 0000001000 - 0000006000 pattern 7 ... 0000001000 - 0000006000 pattern 8 ... 0000001000 - 0000006000 pattern 9 ... But in fact Linux didn't test anything for patterns > 4 as the default case in memtest() is to leave the function. I suggest to use the memtest parameter as the number of tests to be performed and to re-iterate over all existing patterns. Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 9cab18b0b85..00b8bdc64c3 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -9,6 +9,8 @@ #include +#define _MAX_MEM_PATTERNS 4 + static void __init memtest(unsigned long start_phys, unsigned long size, unsigned pattern) { @@ -21,6 +23,8 @@ static void __init memtest(unsigned long start_phys, unsigned long size, unsigned long count; unsigned long incr; + pattern = pattern % _MAX_MEM_PATTERNS; + switch (pattern) { case 0: val = 0UL; @@ -110,8 +114,9 @@ void __init early_memtest(unsigned long start, unsigned long end) t_size = end - t_start; printk(KERN_CONT "\n %010llx - %010llx pattern %d", - (unsigned long long)t_start, - (unsigned long long)t_start + t_size, pattern); + (unsigned long long)t_start, + (unsigned long long)t_start + t_size, + pattern % _MAX_MEM_PATTERNS); memtest(t_start, t_size, pattern); -- cgit v1.2.3-70-g09d2 From 6d74171bf7315257d276aa35400c5a8d6a993f19 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 25 Feb 2009 11:27:27 +0100 Subject: x86: memtest: introduce array to select memtest patterns Impact: code cleanup Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 65 ++++++++++++++++++--------------------------------- 1 file changed, 23 insertions(+), 42 deletions(-) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 00b8bdc64c3..827f94044cf 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -9,48 +9,25 @@ #include -#define _MAX_MEM_PATTERNS 4 +static u64 patterns[] __initdata = { + 0, + 0xffffffffffffffffULL, + 0x5555555555555555ULL, + 0xaaaaaaaaaaaaaaaaULL, +}; static void __init memtest(unsigned long start_phys, unsigned long size, - unsigned pattern) + u64 pattern) { unsigned long i; - unsigned long *start; + u64 *start; unsigned long start_bad; unsigned long last_bad; - unsigned long val; unsigned long start_phys_aligned; unsigned long count; unsigned long incr; - pattern = pattern % _MAX_MEM_PATTERNS; - - switch (pattern) { - case 0: - val = 0UL; - break; - case 1: - val = -1UL; - break; - case 2: -#ifdef CONFIG_X86_64 - val = 0x5555555555555555UL; -#else - val = 0x55555555UL; -#endif - break; - case 3: -#ifdef CONFIG_X86_64 - val = 0xaaaaaaaaaaaaaaaaUL; -#else - val = 0xaaaaaaaaUL; -#endif - break; - default: - return; - } - - incr = sizeof(unsigned long); + incr = sizeof(pattern); start_phys_aligned = ALIGN(start_phys, incr); count = (size - (start_phys_aligned - start_phys))/incr; start = __va(start_phys_aligned); @@ -58,15 +35,16 @@ static void __init memtest(unsigned long start_phys, unsigned long size, last_bad = 0; for (i = 0; i < count; i++) - start[i] = val; + start[i] = pattern; for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { - if (*start != val) { + if (*start != pattern) { if (start_phys_aligned == last_bad + incr) { last_bad += incr; } else { if (start_bad) { - printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved", - val, start_bad, last_bad + incr); + printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", + (unsigned long long) pattern, + start_bad, last_bad + incr); reserve_early(start_bad, last_bad + incr, "BAD RAM"); } start_bad = last_bad = start_phys_aligned; @@ -74,8 +52,9 @@ static void __init memtest(unsigned long start_phys, unsigned long size, } } if (start_bad) { - printk(KERN_CONT "\n %016lx bad mem addr %010lx - %010lx reserved", - val, start_bad, last_bad + incr); + printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", + (unsigned long long) pattern, start_bad, + last_bad + incr); reserve_early(start_bad, last_bad + incr, "BAD RAM"); } } @@ -95,13 +74,16 @@ early_param("memtest", parse_memtest); void __init early_memtest(unsigned long start, unsigned long end) { u64 t_start, t_size; - unsigned pattern; + unsigned int i; + u64 pattern; if (!memtest_pattern) return; printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); - for (pattern = 0; pattern < memtest_pattern; pattern++) { + for (i = 0; i < memtest_pattern; i++) { + unsigned int idx = i % ARRAY_SIZE(patterns); + pattern = patterns[idx]; t_start = start; t_size = 0; while (t_start < end) { @@ -115,8 +97,7 @@ void __init early_memtest(unsigned long start, unsigned long end) printk(KERN_CONT "\n %010llx - %010llx pattern %d", (unsigned long long)t_start, - (unsigned long long)t_start + t_size, - pattern % _MAX_MEM_PATTERNS); + (unsigned long long)t_start + t_size, idx); memtest(t_start, t_size, pattern); -- cgit v1.2.3-70-g09d2 From 7dad169e57eda1f0aa6dc5ac43a898b4b0ced2c7 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 25 Feb 2009 11:28:07 +0100 Subject: x86: memtest: cleanup memtest function Impact: code cleanup Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 827f94044cf..01a72d6825b 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -16,6 +16,15 @@ static u64 patterns[] __initdata = { 0xaaaaaaaaaaaaaaaaULL, }; +static void __init reserve_bad_mem(u64 pattern, unsigned long start_bad, + unsigned long end_bad) +{ + printk(KERN_CONT "\n %016llx bad mem addr " + "%010lx - %010lx reserved", + (unsigned long long) pattern, start_bad, end_bad); + reserve_early(start_bad, end_bad, "BAD RAM"); +} + static void __init memtest(unsigned long start_phys, unsigned long size, u64 pattern) { @@ -37,26 +46,18 @@ static void __init memtest(unsigned long start_phys, unsigned long size, for (i = 0; i < count; i++) start[i] = pattern; for (i = 0; i < count; i++, start++, start_phys_aligned += incr) { - if (*start != pattern) { - if (start_phys_aligned == last_bad + incr) { - last_bad += incr; - } else { - if (start_bad) { - printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", - (unsigned long long) pattern, - start_bad, last_bad + incr); - reserve_early(start_bad, last_bad + incr, "BAD RAM"); - } - start_bad = last_bad = start_phys_aligned; - } + if (*start == pattern) + continue; + if (start_phys_aligned == last_bad + incr) { + last_bad += incr; + continue; } + if (start_bad) + reserve_bad_mem(pattern, start_bad, last_bad + incr); + start_bad = last_bad = start_phys_aligned; } - if (start_bad) { - printk(KERN_CONT "\n %016llx bad mem addr %010lx - %010lx reserved", - (unsigned long long) pattern, start_bad, - last_bad + incr); - reserve_early(start_bad, last_bad + incr, "BAD RAM"); - } + if (start_bad) + reserve_bad_mem(pattern, start_bad, last_bad + incr); } /* default is disabled */ -- cgit v1.2.3-70-g09d2 From 570c9e69aaa84689fb8ed2a3a4af39ca54ba7a47 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 25 Feb 2009 11:28:58 +0100 Subject: x86: memtest: adapt log messages - print test pattern instead of pattern number, - show pattern as stored in memory, - use proper priority flags, - consistent use of u64 throughout the code Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 36 ++++++++++++++++-------------------- 1 file changed, 16 insertions(+), 20 deletions(-) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 01a72d6825b..3232397783a 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -16,25 +16,22 @@ static u64 patterns[] __initdata = { 0xaaaaaaaaaaaaaaaaULL, }; -static void __init reserve_bad_mem(u64 pattern, unsigned long start_bad, - unsigned long end_bad) +static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) { - printk(KERN_CONT "\n %016llx bad mem addr " - "%010lx - %010lx reserved", - (unsigned long long) pattern, start_bad, end_bad); + printk(KERN_INFO " %016llx bad mem addr %010llx - %010llx reserved\n", + (unsigned long long) pattern, + (unsigned long long) start_bad, + (unsigned long long) end_bad); reserve_early(start_bad, end_bad, "BAD RAM"); } -static void __init memtest(unsigned long start_phys, unsigned long size, - u64 pattern) +static void __init memtest(u64 pattern, u64 start_phys, u64 size) { - unsigned long i; + u64 i, count; u64 *start; - unsigned long start_bad; - unsigned long last_bad; - unsigned long start_phys_aligned; - unsigned long count; - unsigned long incr; + u64 start_bad, last_bad; + u64 start_phys_aligned; + size_t incr; incr = sizeof(pattern); start_phys_aligned = ALIGN(start_phys, incr); @@ -81,7 +78,7 @@ void __init early_memtest(unsigned long start, unsigned long end) if (!memtest_pattern) return; - printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern); + printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); for (i = 0; i < memtest_pattern; i++) { unsigned int idx = i % ARRAY_SIZE(patterns); pattern = patterns[idx]; @@ -96,14 +93,13 @@ void __init early_memtest(unsigned long start, unsigned long end) if (t_start + t_size > end) t_size = end - t_start; - printk(KERN_CONT "\n %010llx - %010llx pattern %d", - (unsigned long long)t_start, - (unsigned long long)t_start + t_size, idx); - - memtest(t_start, t_size, pattern); + printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", + (unsigned long long) t_start, + (unsigned long long) t_start + t_size, + (unsigned long long) cpu_to_be64(pattern)); + memtest(pattern, t_start, t_size); t_start += t_size; } } - printk(KERN_CONT "\n"); } -- cgit v1.2.3-70-g09d2 From bfb4dc0da45f8fddc76eba7e62919420c7d6dae2 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 25 Feb 2009 11:30:04 +0100 Subject: x86: memtest: wipe out test pattern from memory Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 56 ++++++++++++++++++++++++++++++--------------------- 1 file changed, 33 insertions(+), 23 deletions(-) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 3232397783a..9c52ef19e6f 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -57,6 +57,29 @@ static void __init memtest(u64 pattern, u64 start_phys, u64 size) reserve_bad_mem(pattern, start_bad, last_bad + incr); } +static void __init do_one_pass(u64 pattern, u64 start, u64 end) +{ + u64 size = 0; + + while (start < end) { + start = find_e820_area_size(start, &size, 1); + + /* done ? */ + if (start >= end) + break; + if (start + size > end) + size = end - start; + + printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", + (unsigned long long) start, + (unsigned long long) start + size, + (unsigned long long) cpu_to_be64(pattern)); + memtest(pattern, start, size); + + start += size; + } +} + /* default is disabled */ static int memtest_pattern __initdata; @@ -71,35 +94,22 @@ early_param("memtest", parse_memtest); void __init early_memtest(unsigned long start, unsigned long end) { - u64 t_start, t_size; unsigned int i; - u64 pattern; + unsigned int idx = 0; if (!memtest_pattern) return; printk(KERN_INFO "early_memtest: # of tests: %d\n", memtest_pattern); for (i = 0; i < memtest_pattern; i++) { - unsigned int idx = i % ARRAY_SIZE(patterns); - pattern = patterns[idx]; - t_start = start; - t_size = 0; - while (t_start < end) { - t_start = find_e820_area_size(t_start, &t_size, 1); - - /* done ? */ - if (t_start >= end) - break; - if (t_start + t_size > end) - t_size = end - t_start; - - printk(KERN_INFO " %010llx - %010llx pattern %016llx\n", - (unsigned long long) t_start, - (unsigned long long) t_start + t_size, - (unsigned long long) cpu_to_be64(pattern)); - memtest(pattern, t_start, t_size); - - t_start += t_size; - } + idx = i % ARRAY_SIZE(patterns); + do_one_pass(patterns[idx], start, end); + } + + if (idx > 0) { + printk(KERN_INFO "early_memtest: wipe out " + "test pattern from memory\n"); + /* additional test with pattern 0 will do this */ + do_one_pass(0, start, end); } } -- cgit v1.2.3-70-g09d2 From 63823126c221dd721ce7351b596b3b73aa943613 Mon Sep 17 00:00:00 2001 From: Andreas Herrmann Date: Wed, 25 Feb 2009 11:31:49 +0100 Subject: x86: memtest: add additional (regular) test patterns Signed-off-by: Andreas Herrmann Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 9c52ef19e6f..0bcd7883d03 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -14,6 +14,19 @@ static u64 patterns[] __initdata = { 0xffffffffffffffffULL, 0x5555555555555555ULL, 0xaaaaaaaaaaaaaaaaULL, + 0x1111111111111111ULL, + 0x2222222222222222ULL, + 0x4444444444444444ULL, + 0x8888888888888888ULL, + 0x3333333333333333ULL, + 0x6666666666666666ULL, + 0x9999999999999999ULL, + 0xccccccccccccccccULL, + 0x7777777777777777ULL, + 0xbbbbbbbbbbbbbbbbULL, + 0xddddddddddddddddULL, + 0xeeeeeeeeeeeeeeeeULL, + 0x7a6c7258554e494cULL, /* yeah ;-) */ }; static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad) -- cgit v1.2.3-70-g09d2 From d1a8e7792047f7dca7eb5759250e2c12800bf262 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Fri, 6 Mar 2009 03:12:50 -0800 Subject: x86: make "memtest" like "memtest=17" Impact: make boot command line "memtest" do one loop by default So don't need to guess many patterns in one loop. Signed-off-by: Yinghai Lu LKML-Reference: <49B10532.3020105@kernel.org> Signed-off-by: Ingo Molnar --- arch/x86/mm/memtest.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch/x86/mm/memtest.c') diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c index 0bcd7883d03..605c8be0621 100644 --- a/arch/x86/mm/memtest.c +++ b/arch/x86/mm/memtest.c @@ -100,6 +100,9 @@ static int __init parse_memtest(char *arg) { if (arg) memtest_pattern = simple_strtoul(arg, NULL, 0); + else + memtest_pattern = ARRAY_SIZE(patterns); + return 0; } -- cgit v1.2.3-70-g09d2