From ee031c31d6381d004bfd386c2e45821211507499 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Thu, 12 Feb 2009 13:49:34 +0100 Subject: [PATCH] x86, mce, cmci: use polled banks bitmap in machine check poller Define a per cpu bitmap that contains the banks polled by the machine check poller. This is needed for the CMCI code in the next patches to be able to disable polling on specific banks. The bank by default contains all banks, so there is no behaviour change. Only future code will remove some banks from the polling set. Signed-off-by: Andi Kleen Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/mce.h | 5 ++++- arch/x86/kernel/cpu/mcheck/mce_64.c | 16 ++++++++++++---- arch/x86/kernel/cpu/mcheck/mce_amd_64.c | 3 ++- 3 files changed, 18 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index 125cd8714622..9b9523699dbc 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -119,11 +119,14 @@ extern atomic_t mce_entry; extern void do_machine_check(struct pt_regs *, long); +typedef DECLARE_BITMAP(mce_banks_t, MAX_NR_BANKS); +DECLARE_PER_CPU(mce_banks_t, mce_poll_banks); + enum mcp_flags { MCP_TIMESTAMP = (1 << 0), /* log time stamp */ MCP_UC = (1 << 1), /* log uncorrected errors */ }; -extern void machine_check_poll(enum mcp_flags flags); +extern void machine_check_poll(enum mcp_flags flags, mce_banks_t *b); extern int mce_notify_user(void); diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c index 9017609cadd9..a8ff38bfa6ed 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_64.c +++ b/arch/x86/kernel/cpu/mcheck/mce_64.c @@ -62,6 +62,11 @@ static char *trigger_argv[2] = { trigger, NULL }; static DECLARE_WAIT_QUEUE_HEAD(mce_wait); +/* MCA banks polled by the period polling timer for corrected events */ +DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = { + [0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL +}; + /* Do initial initialization of a struct mce */ void mce_setup(struct mce *m) { @@ -191,7 +196,7 @@ static inline void mce_get_rip(struct mce *m, struct pt_regs *regs) * * This is executed in standard interrupt context. */ -void machine_check_poll(enum mcp_flags flags) +void machine_check_poll(enum mcp_flags flags, mce_banks_t *b) { struct mce m; int i; @@ -200,7 +205,7 @@ void machine_check_poll(enum mcp_flags flags) rdmsrl(MSR_IA32_MCG_STATUS, m.mcgstatus); for (i = 0; i < banks; i++) { - if (!bank[i]) + if (!bank[i] || !test_bit(i, *b)) continue; m.misc = 0; @@ -458,7 +463,8 @@ static void mcheck_timer(unsigned long data) WARN_ON(smp_processor_id() != data); if (mce_available(¤t_cpu_data)) - machine_check_poll(MCP_TIMESTAMP); + machine_check_poll(MCP_TIMESTAMP, + &__get_cpu_var(mce_poll_banks)); /* * Alert userspace if needed. If we logged an MCE, reduce the @@ -572,11 +578,13 @@ static void mce_init(void *dummy) { u64 cap; int i; + mce_banks_t all_banks; /* * Log the machine checks left over from the previous reset. */ - machine_check_poll(MCP_UC); + bitmap_fill(all_banks, MAX_NR_BANKS); + machine_check_poll(MCP_UC, &all_banks); set_in_cr4(X86_CR4_MCE); diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c index 49705be98209..ee8bfcd3aa32 100644 --- a/arch/x86/kernel/cpu/mcheck/mce_amd_64.c +++ b/arch/x86/kernel/cpu/mcheck/mce_amd_64.c @@ -231,7 +231,8 @@ static void amd_threshold_interrupt(void) /* Log the machine check that caused the threshold event. */ - machine_check_poll(MCP_TIMESTAMP); + machine_check_poll(MCP_TIMESTAMP, + &__get_cpu_var(mce_poll_banks)); if (high & MASK_OVERFLOW_HI) { rdmsrl(address, m.misc); -- GitLab