diff options
Diffstat (limited to 'arch/x86/kernel/cpu/intel.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 72 |
1 files changed, 51 insertions, 21 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 32bd64017047..2c43a1423b09 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -784,26 +784,37 @@ static unsigned int intel_size_cache(struct cpuinfo_x86 *c, unsigned int size) } #endif -#define TLB_INST_4K 0x01 -#define TLB_INST_4M 0x02 -#define TLB_INST_2M_4M 0x03 +#define TLB_INST_4K 0x01 +#define TLB_INST_4M 0x02 +#define TLB_INST_2M_4M 0x03 -#define TLB_INST_ALL 0x05 -#define TLB_INST_1G 0x06 +#define TLB_INST_ALL 0x05 +#define TLB_INST_1G 0x06 -#define TLB_DATA_4K 0x11 -#define TLB_DATA_4M 0x12 -#define TLB_DATA_2M_4M 0x13 -#define TLB_DATA_4K_4M 0x14 +#define TLB_DATA_4K 0x11 +#define TLB_DATA_4M 0x12 +#define TLB_DATA_2M_4M 0x13 +#define TLB_DATA_4K_4M 0x14 -#define TLB_DATA_1G 0x16 +#define TLB_DATA_1G 0x16 +#define TLB_DATA_1G_2M_4M 0x17 -#define TLB_DATA0_4K 0x21 -#define TLB_DATA0_4M 0x22 -#define TLB_DATA0_2M_4M 0x23 +#define TLB_DATA0_4K 0x21 +#define TLB_DATA0_4M 0x22 +#define TLB_DATA0_2M_4M 0x23 -#define STLB_4K 0x41 -#define STLB_4K_2M 0x42 +#define STLB_4K 0x41 +#define STLB_4K_2M 0x42 + +/* + * All of leaf 0x2's one-byte TLB descriptors implies the same number of + * entries for their respective TLB types. The 0x63 descriptor is an + * exception: it implies 4 dTLB entries for 1GB pages 32 dTLB entries + * for 2MB or 4MB pages. Encode descriptor 0x63 dTLB entry count for + * 2MB/4MB pages here, as its count for dTLB 1GB pages is already at the + * intel_tlb_table[] mapping. + */ +#define TLB_0x63_2M_4M_ENTRIES 32 static const struct _tlb_table intel_tlb_table[] = { { 0x01, TLB_INST_4K, 32, " TLB_INST 4 KByte pages, 4-way set associative" }, @@ -825,7 +836,8 @@ static const struct _tlb_table intel_tlb_table[] = { { 0x5c, TLB_DATA_4K_4M, 128, " TLB_DATA 4 KByte and 4 MByte pages" }, { 0x5d, TLB_DATA_4K_4M, 256, " TLB_DATA 4 KByte and 4 MByte pages" }, { 0x61, TLB_INST_4K, 48, " TLB_INST 4 KByte pages, full associative" }, - { 0x63, TLB_DATA_1G, 4, " TLB_DATA 1 GByte pages, 4-way set associative" }, + { 0x63, TLB_DATA_1G_2M_4M, 4, " TLB_DATA 1 GByte pages, 4-way set associative" + " (plus 32 entries TLB_DATA 2 MByte or 4 MByte pages, not encoded here)" }, { 0x6b, TLB_DATA_4K, 256, " TLB_DATA 4 KByte pages, 8-way associative" }, { 0x6c, TLB_DATA_2M_4M, 128, " TLB_DATA 2 MByte or 4 MByte pages, 8-way associative" }, { 0x6d, TLB_DATA_1G, 16, " TLB_DATA 1 GByte pages, fully associative" }, @@ -925,6 +937,12 @@ static void intel_tlb_lookup(const unsigned char desc) if (tlb_lld_4m[ENTRIES] < intel_tlb_table[k].entries) tlb_lld_4m[ENTRIES] = intel_tlb_table[k].entries; break; + case TLB_DATA_1G_2M_4M: + if (tlb_lld_2m[ENTRIES] < TLB_0x63_2M_4M_ENTRIES) + tlb_lld_2m[ENTRIES] = TLB_0x63_2M_4M_ENTRIES; + if (tlb_lld_4m[ENTRIES] < TLB_0x63_2M_4M_ENTRIES) + tlb_lld_4m[ENTRIES] = TLB_0x63_2M_4M_ENTRIES; + fallthrough; case TLB_DATA_1G: if (tlb_lld_1g[ENTRIES] < intel_tlb_table[k].entries) tlb_lld_1g[ENTRIES] = intel_tlb_table[k].entries; @@ -948,7 +966,7 @@ static void intel_detect_tlb(struct cpuinfo_x86 *c) cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]); /* If bit 31 is set, this is an unknown format */ - for (j = 0 ; j < 3 ; j++) + for (j = 0 ; j < 4 ; j++) if (regs[j] & (1 << 31)) regs[j] = 0; @@ -1186,7 +1204,13 @@ static void __split_lock_reenable(struct work_struct *work) { sld_update_msr(true); } -static DECLARE_DELAYED_WORK(sl_reenable, __split_lock_reenable); +/* + * In order for each CPU to schedule its delayed work independently of the + * others, delayed work struct must be per-CPU. This is not required when + * sysctl_sld_mitigate is enabled because of the semaphore that limits + * the number of simultaneously scheduled delayed works to 1. + */ +static DEFINE_PER_CPU(struct delayed_work, sl_reenable); /* * If a CPU goes offline with pending delayed work to re-enable split lock @@ -1207,7 +1231,7 @@ static int splitlock_cpu_offline(unsigned int cpu) static void split_lock_warn(unsigned long ip) { - struct delayed_work *work; + struct delayed_work *work = NULL; int cpu; if (!current->reported_split_lock) @@ -1229,11 +1253,17 @@ static void split_lock_warn(unsigned long ip) if (down_interruptible(&buslock_sem) == -EINTR) return; work = &sl_reenable_unlock; - } else { - work = &sl_reenable; } cpu = get_cpu(); + + if (!work) { + work = this_cpu_ptr(&sl_reenable); + /* Deferred initialization of per-CPU struct */ + if (!work->work.func) + INIT_DELAYED_WORK(work, __split_lock_reenable); + } + schedule_delayed_work_on(cpu, work, 2); /* Disable split lock detection on this CPU to make progress */ |