+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Routines to identify caches on Intel CPU.
- *
- * Changes:
- * Venkatesh Pallipadi : Adding cache identification through cpuid(4)
- * Ashok Raj <ashok.raj@intel.com>: Work with CPU hotplug infrastructure.
- * Andi Kleen / Andreas Herrmann : CPUID4 emulation on AMD.
- */
-
-#include <linux/slab.h>
-#include <linux/cacheinfo.h>
-#include <linux/cpu.h>
-#include <linux/sched.h>
-#include <linux/capability.h>
-#include <linux/sysfs.h>
-#include <linux/pci.h>
-
-#include <asm/cpufeature.h>
-#include <asm/amd_nb.h>
-#include <asm/smp.h>
-
-#define LVL_1_INST 1
-#define LVL_1_DATA 2
-#define LVL_2 3
-#define LVL_3 4
-#define LVL_TRACE 5
-
-struct _cache_table {
- unsigned char descriptor;
- char cache_type;
- short size;
-};
-
-#define MB(x) ((x) * 1024)
-
-/* All the cache descriptor types we care about (no TLB or
- trace cache entries) */
-
-static const struct _cache_table cache_table[] =
-{
- { 0x06, LVL_1_INST, 8 }, /* 4-way set assoc, 32 byte line size */
- { 0x08, LVL_1_INST, 16 }, /* 4-way set assoc, 32 byte line size */
- { 0x09, LVL_1_INST, 32 }, /* 4-way set assoc, 64 byte line size */
- { 0x0a, LVL_1_DATA, 8 }, /* 2 way set assoc, 32 byte line size */
- { 0x0c, LVL_1_DATA, 16 }, /* 4-way set assoc, 32 byte line size */
- { 0x0d, LVL_1_DATA, 16 }, /* 4-way set assoc, 64 byte line size */
- { 0x0e, LVL_1_DATA, 24 }, /* 6-way set assoc, 64 byte line size */
- { 0x21, LVL_2, 256 }, /* 8-way set assoc, 64 byte line size */
- { 0x22, LVL_3, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x23, LVL_3, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x25, LVL_3, MB(2) }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x29, LVL_3, MB(4) }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x2c, LVL_1_DATA, 32 }, /* 8-way set assoc, 64 byte line size */
- { 0x30, LVL_1_INST, 32 }, /* 8-way set assoc, 64 byte line size */
- { 0x39, LVL_2, 128 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x3a, LVL_2, 192 }, /* 6-way set assoc, sectored cache, 64 byte line size */
- { 0x3b, LVL_2, 128 }, /* 2-way set assoc, sectored cache, 64 byte line size */
- { 0x3c, LVL_2, 256 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x3d, LVL_2, 384 }, /* 6-way set assoc, sectored cache, 64 byte line size */
- { 0x3e, LVL_2, 512 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x3f, LVL_2, 256 }, /* 2-way set assoc, 64 byte line size */
- { 0x41, LVL_2, 128 }, /* 4-way set assoc, 32 byte line size */
- { 0x42, LVL_2, 256 }, /* 4-way set assoc, 32 byte line size */
- { 0x43, LVL_2, 512 }, /* 4-way set assoc, 32 byte line size */
- { 0x44, LVL_2, MB(1) }, /* 4-way set assoc, 32 byte line size */
- { 0x45, LVL_2, MB(2) }, /* 4-way set assoc, 32 byte line size */
- { 0x46, LVL_3, MB(4) }, /* 4-way set assoc, 64 byte line size */
- { 0x47, LVL_3, MB(8) }, /* 8-way set assoc, 64 byte line size */
- { 0x48, LVL_2, MB(3) }, /* 12-way set assoc, 64 byte line size */
- { 0x49, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
- { 0x4a, LVL_3, MB(6) }, /* 12-way set assoc, 64 byte line size */
- { 0x4b, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
- { 0x4c, LVL_3, MB(12) }, /* 12-way set assoc, 64 byte line size */
- { 0x4d, LVL_3, MB(16) }, /* 16-way set assoc, 64 byte line size */
- { 0x4e, LVL_2, MB(6) }, /* 24-way set assoc, 64 byte line size */
- { 0x60, LVL_1_DATA, 16 }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x66, LVL_1_DATA, 8 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x67, LVL_1_DATA, 16 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x68, LVL_1_DATA, 32 }, /* 4-way set assoc, sectored cache, 64 byte line size */
- { 0x70, LVL_TRACE, 12 }, /* 8-way set assoc */
- { 0x71, LVL_TRACE, 16 }, /* 8-way set assoc */
- { 0x72, LVL_TRACE, 32 }, /* 8-way set assoc */
- { 0x73, LVL_TRACE, 64 }, /* 8-way set assoc */
- { 0x78, LVL_2, MB(1) }, /* 4-way set assoc, 64 byte line size */
- { 0x79, LVL_2, 128 }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x7a, LVL_2, 256 }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x7b, LVL_2, 512 }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x7c, LVL_2, MB(1) }, /* 8-way set assoc, sectored cache, 64 byte line size */
- { 0x7d, LVL_2, MB(2) }, /* 8-way set assoc, 64 byte line size */
- { 0x7f, LVL_2, 512 }, /* 2-way set assoc, 64 byte line size */
- { 0x80, LVL_2, 512 }, /* 8-way set assoc, 64 byte line size */
- { 0x82, LVL_2, 256 }, /* 8-way set assoc, 32 byte line size */
- { 0x83, LVL_2, 512 }, /* 8-way set assoc, 32 byte line size */
- { 0x84, LVL_2, MB(1) }, /* 8-way set assoc, 32 byte line size */
- { 0x85, LVL_2, MB(2) }, /* 8-way set assoc, 32 byte line size */
- { 0x86, LVL_2, 512 }, /* 4-way set assoc, 64 byte line size */
- { 0x87, LVL_2, MB(1) }, /* 8-way set assoc, 64 byte line size */
- { 0xd0, LVL_3, 512 }, /* 4-way set assoc, 64 byte line size */
- { 0xd1, LVL_3, MB(1) }, /* 4-way set assoc, 64 byte line size */
- { 0xd2, LVL_3, MB(2) }, /* 4-way set assoc, 64 byte line size */
- { 0xd6, LVL_3, MB(1) }, /* 8-way set assoc, 64 byte line size */
- { 0xd7, LVL_3, MB(2) }, /* 8-way set assoc, 64 byte line size */
- { 0xd8, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
- { 0xdc, LVL_3, MB(2) }, /* 12-way set assoc, 64 byte line size */
- { 0xdd, LVL_3, MB(4) }, /* 12-way set assoc, 64 byte line size */
- { 0xde, LVL_3, MB(8) }, /* 12-way set assoc, 64 byte line size */
- { 0xe2, LVL_3, MB(2) }, /* 16-way set assoc, 64 byte line size */
- { 0xe3, LVL_3, MB(4) }, /* 16-way set assoc, 64 byte line size */
- { 0xe4, LVL_3, MB(8) }, /* 16-way set assoc, 64 byte line size */
- { 0xea, LVL_3, MB(12) }, /* 24-way set assoc, 64 byte line size */
- { 0xeb, LVL_3, MB(18) }, /* 24-way set assoc, 64 byte line size */
- { 0xec, LVL_3, MB(24) }, /* 24-way set assoc, 64 byte line size */
- { 0x00, 0, 0}
-};
-
-
-enum _cache_type {
- CTYPE_NULL = 0,
- CTYPE_DATA = 1,
- CTYPE_INST = 2,
- CTYPE_UNIFIED = 3
-};
-
-union _cpuid4_leaf_eax {
- struct {
- enum _cache_type type:5;
- unsigned int level:3;
- unsigned int is_self_initializing:1;
- unsigned int is_fully_associative:1;
- unsigned int reserved:4;
- unsigned int num_threads_sharing:12;
- unsigned int num_cores_on_die:6;
- } split;
- u32 full;
-};
-
-union _cpuid4_leaf_ebx {
- struct {
- unsigned int coherency_line_size:12;
- unsigned int physical_line_partition:10;
- unsigned int ways_of_associativity:10;
- } split;
- u32 full;
-};
-
-union _cpuid4_leaf_ecx {
- struct {
- unsigned int number_of_sets:32;
- } split;
- u32 full;
-};
-
-struct _cpuid4_info_regs {
- union _cpuid4_leaf_eax eax;
- union _cpuid4_leaf_ebx ebx;
- union _cpuid4_leaf_ecx ecx;
- unsigned int id;
- unsigned long size;
- struct amd_northbridge *nb;
-};
-
-static unsigned short num_cache_leaves;
-
-/* AMD doesn't have CPUID4. Emulate it here to report the same
- information to the user. This makes some assumptions about the machine:
- L2 not shared, no SMT etc. that is currently true on AMD CPUs.
-
- In theory the TLBs could be reported as fake type (they are in "dummy").
- Maybe later */
-union l1_cache {
- struct {
- unsigned line_size:8;
- unsigned lines_per_tag:8;
- unsigned assoc:8;
- unsigned size_in_kb:8;
- };
- unsigned val;
-};
-
-union l2_cache {
- struct {
- unsigned line_size:8;
- unsigned lines_per_tag:4;
- unsigned assoc:4;
- unsigned size_in_kb:16;
- };
- unsigned val;
-};
-
-union l3_cache {
- struct {
- unsigned line_size:8;
- unsigned lines_per_tag:4;
- unsigned assoc:4;
- unsigned res:2;
- unsigned size_encoded:14;
- };
- unsigned val;
-};
-
-static const unsigned short assocs[] = {
- [1] = 1,
- [2] = 2,
- [4] = 4,
- [6] = 8,
- [8] = 16,
- [0xa] = 32,
- [0xb] = 48,
- [0xc] = 64,
- [0xd] = 96,
- [0xe] = 128,
- [0xf] = 0xffff /* fully associative - no way to show this currently */
-};
-
-static const unsigned char levels[] = { 1, 1, 2, 3 };
-static const unsigned char types[] = { 1, 2, 3, 3 };
-
-static const enum cache_type cache_type_map[] = {
- [CTYPE_NULL] = CACHE_TYPE_NOCACHE,
- [CTYPE_DATA] = CACHE_TYPE_DATA,
- [CTYPE_INST] = CACHE_TYPE_INST,
- [CTYPE_UNIFIED] = CACHE_TYPE_UNIFIED,
-};
-
-static void
-amd_cpuid4(int leaf, union _cpuid4_leaf_eax *eax,
- union _cpuid4_leaf_ebx *ebx,
- union _cpuid4_leaf_ecx *ecx)
-{
- unsigned dummy;
- unsigned line_size, lines_per_tag, assoc, size_in_kb;
- union l1_cache l1i, l1d;
- union l2_cache l2;
- union l3_cache l3;
- union l1_cache *l1 = &l1d;
-
- eax->full = 0;
- ebx->full = 0;
- ecx->full = 0;
-
- cpuid(0x80000005, &dummy, &dummy, &l1d.val, &l1i.val);
- cpuid(0x80000006, &dummy, &dummy, &l2.val, &l3.val);
-
- switch (leaf) {
- case 1:
- l1 = &l1i;
- case 0:
- if (!l1->val)
- return;
- assoc = assocs[l1->assoc];
- line_size = l1->line_size;
- lines_per_tag = l1->lines_per_tag;
- size_in_kb = l1->size_in_kb;
- break;
- case 2:
- if (!l2.val)
- return;
- assoc = assocs[l2.assoc];
- line_size = l2.line_size;
- lines_per_tag = l2.lines_per_tag;
- /* cpu_data has errata corrections for K7 applied */
- size_in_kb = __this_cpu_read(cpu_info.x86_cache_size);
- break;
- case 3:
- if (!l3.val)
- return;
- assoc = assocs[l3.assoc];
- line_size = l3.line_size;
- lines_per_tag = l3.lines_per_tag;
- size_in_kb = l3.size_encoded * 512;
- if (boot_cpu_has(X86_FEATURE_AMD_DCM)) {
- size_in_kb = size_in_kb >> 1;
- assoc = assoc >> 1;
- }
- break;
- default:
- return;
- }
-
- eax->split.is_self_initializing = 1;
- eax->split.type = types[leaf];
- eax->split.level = levels[leaf];
- eax->split.num_threads_sharing = 0;
- eax->split.num_cores_on_die = __this_cpu_read(cpu_info.x86_max_cores) - 1;
-
-
- if (assoc == 0xffff)
- eax->split.is_fully_associative = 1;
- ebx->split.coherency_line_size = line_size - 1;
- ebx->split.ways_of_associativity = assoc - 1;
- ebx->split.physical_line_partition = lines_per_tag - 1;
- ecx->split.number_of_sets = (size_in_kb * 1024) / line_size /
- (ebx->split.ways_of_associativity + 1) - 1;
-}
-
-#if defined(CONFIG_AMD_NB) && defined(CONFIG_SYSFS)
-
-/*
- * L3 cache descriptors
- */
-static void amd_calc_l3_indices(struct amd_northbridge *nb)
-{
- struct amd_l3_cache *l3 = &nb->l3_cache;
- unsigned int sc0, sc1, sc2, sc3;
- u32 val = 0;
-
- pci_read_config_dword(nb->misc, 0x1C4, &val);
-
- /* calculate subcache sizes */
- l3->subcaches[0] = sc0 = !(val & BIT(0));
- l3->subcaches[1] = sc1 = !(val & BIT(4));
-
- if (boot_cpu_data.x86 == 0x15) {
- l3->subcaches[0] = sc0 += !(val & BIT(1));
- l3->subcaches[1] = sc1 += !(val & BIT(5));
- }
-
- l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
- l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
-
- l3->indices = (max(max3(sc0, sc1, sc2), sc3) << 10) - 1;
-}
-
-/*
- * check whether a slot used for disabling an L3 index is occupied.
- * @l3: L3 cache descriptor
- * @slot: slot number (0..1)
- *
- * @returns: the disabled index if used or negative value if slot free.
- */
-static int amd_get_l3_disable_slot(struct amd_northbridge *nb, unsigned slot)
-{
- unsigned int reg = 0;
-
- pci_read_config_dword(nb->misc, 0x1BC + slot * 4, ®);
-
- /* check whether this slot is activated already */
- if (reg & (3UL << 30))
- return reg & 0xfff;
-
- return -1;
-}
-
-static ssize_t show_cache_disable(struct cacheinfo *this_leaf, char *buf,
- unsigned int slot)
-{
- int index;
- struct amd_northbridge *nb = this_leaf->priv;
-
- index = amd_get_l3_disable_slot(nb, slot);
- if (index >= 0)
- return sprintf(buf, "%d\n", index);
-
- return sprintf(buf, "FREE\n");
-}
-
-#define SHOW_CACHE_DISABLE(slot) \
-static ssize_t \
-cache_disable_##slot##_show(struct device *dev, \
- struct device_attribute *attr, char *buf) \
-{ \
- struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
- return show_cache_disable(this_leaf, buf, slot); \
-}
-SHOW_CACHE_DISABLE(0)
-SHOW_CACHE_DISABLE(1)
-
-static void amd_l3_disable_index(struct amd_northbridge *nb, int cpu,
- unsigned slot, unsigned long idx)
-{
- int i;
-
- idx |= BIT(30);
-
- /*
- * disable index in all 4 subcaches
- */
- for (i = 0; i < 4; i++) {
- u32 reg = idx | (i << 20);
-
- if (!nb->l3_cache.subcaches[i])
- continue;
-
- pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
-
- /*
- * We need to WBINVD on a core on the node containing the L3
- * cache which indices we disable therefore a simple wbinvd()
- * is not sufficient.
- */
- wbinvd_on_cpu(cpu);
-
- reg |= BIT(31);
- pci_write_config_dword(nb->misc, 0x1BC + slot * 4, reg);
- }
-}
-
-/*
- * disable a L3 cache index by using a disable-slot
- *
- * @l3: L3 cache descriptor
- * @cpu: A CPU on the node containing the L3 cache
- * @slot: slot number (0..1)
- * @index: index to disable
- *
- * @return: 0 on success, error status on failure
- */
-static int amd_set_l3_disable_slot(struct amd_northbridge *nb, int cpu,
- unsigned slot, unsigned long index)
-{
- int ret = 0;
-
- /* check if @slot is already used or the index is already disabled */
- ret = amd_get_l3_disable_slot(nb, slot);
- if (ret >= 0)
- return -EEXIST;
-
- if (index > nb->l3_cache.indices)
- return -EINVAL;
-
- /* check whether the other slot has disabled the same index already */
- if (index == amd_get_l3_disable_slot(nb, !slot))
- return -EEXIST;
-
- amd_l3_disable_index(nb, cpu, slot, index);
-
- return 0;
-}
-
-static ssize_t store_cache_disable(struct cacheinfo *this_leaf,
- const char *buf, size_t count,
- unsigned int slot)
-{
- unsigned long val = 0;
- int cpu, err = 0;
- struct amd_northbridge *nb = this_leaf->priv;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- cpu = cpumask_first(&this_leaf->shared_cpu_map);
-
- if (kstrtoul(buf, 10, &val) < 0)
- return -EINVAL;
-
- err = amd_set_l3_disable_slot(nb, cpu, slot, val);
- if (err) {
- if (err == -EEXIST)
- pr_warn("L3 slot %d in use/index already disabled!\n",
- slot);
- return err;
- }
- return count;
-}
-
-#define STORE_CACHE_DISABLE(slot) \
-static ssize_t \
-cache_disable_##slot##_store(struct device *dev, \
- struct device_attribute *attr, \
- const char *buf, size_t count) \
-{ \
- struct cacheinfo *this_leaf = dev_get_drvdata(dev); \
- return store_cache_disable(this_leaf, buf, count, slot); \
-}
-STORE_CACHE_DISABLE(0)
-STORE_CACHE_DISABLE(1)
-
-static ssize_t subcaches_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct cacheinfo *this_leaf = dev_get_drvdata(dev);
- int cpu = cpumask_first(&this_leaf->shared_cpu_map);
-
- return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
-}
-
-static ssize_t subcaches_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct cacheinfo *this_leaf = dev_get_drvdata(dev);
- int cpu = cpumask_first(&this_leaf->shared_cpu_map);
- unsigned long val;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
-
- if (kstrtoul(buf, 16, &val) < 0)
- return -EINVAL;
-
- if (amd_set_subcaches(cpu, val))
- return -EINVAL;
-
- return count;
-}
-
-static DEVICE_ATTR_RW(cache_disable_0);
-static DEVICE_ATTR_RW(cache_disable_1);
-static DEVICE_ATTR_RW(subcaches);
-
-static umode_t
-cache_private_attrs_is_visible(struct kobject *kobj,
- struct attribute *attr, int unused)
-{
- struct device *dev = kobj_to_dev(kobj);
- struct cacheinfo *this_leaf = dev_get_drvdata(dev);
- umode_t mode = attr->mode;
-
- if (!this_leaf->priv)
- return 0;
-
- if ((attr == &dev_attr_subcaches.attr) &&
- amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
- return mode;
-
- if ((attr == &dev_attr_cache_disable_0.attr ||
- attr == &dev_attr_cache_disable_1.attr) &&
- amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
- return mode;
-
- return 0;
-}
-
-static struct attribute_group cache_private_group = {
- .is_visible = cache_private_attrs_is_visible,
-};
-
-static void init_amd_l3_attrs(void)
-{
- int n = 1;
- static struct attribute **amd_l3_attrs;
-
- if (amd_l3_attrs) /* already initialized */
- return;
-
- if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
- n += 2;
- if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
- n += 1;
-
- amd_l3_attrs = kcalloc(n, sizeof(*amd_l3_attrs), GFP_KERNEL);
- if (!amd_l3_attrs)
- return;
-
- n = 0;
- if (amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE)) {
- amd_l3_attrs[n++] = &dev_attr_cache_disable_0.attr;
- amd_l3_attrs[n++] = &dev_attr_cache_disable_1.attr;
- }
- if (amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
- amd_l3_attrs[n++] = &dev_attr_subcaches.attr;
-
- cache_private_group.attrs = amd_l3_attrs;
-}
-
-const struct attribute_group *
-cache_get_priv_group(struct cacheinfo *this_leaf)
-{
- struct amd_northbridge *nb = this_leaf->priv;
-
- if (this_leaf->level < 3 || !nb)
- return NULL;
-
- if (nb && nb->l3_cache.indices)
- init_amd_l3_attrs();
-
- return &cache_private_group;
-}
-
-static void amd_init_l3_cache(struct _cpuid4_info_regs *this_leaf, int index)
-{
- int node;
-
- /* only for L3, and not in virtualized environments */
- if (index < 3)
- return;
-
- node = amd_get_nb_id(smp_processor_id());
- this_leaf->nb = node_to_amd_nb(node);
- if (this_leaf->nb && !this_leaf->nb->l3_cache.indices)
- amd_calc_l3_indices(this_leaf->nb);
-}
-#else
-#define amd_init_l3_cache(x, y)
-#endif /* CONFIG_AMD_NB && CONFIG_SYSFS */
-
-static int
-cpuid4_cache_lookup_regs(int index, struct _cpuid4_info_regs *this_leaf)
-{
- union _cpuid4_leaf_eax eax;
- union _cpuid4_leaf_ebx ebx;
- union _cpuid4_leaf_ecx ecx;
- unsigned edx;
-
- if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
- if (boot_cpu_has(X86_FEATURE_TOPOEXT))
- cpuid_count(0x8000001d, index, &eax.full,
- &ebx.full, &ecx.full, &edx);
- else
- amd_cpuid4(index, &eax, &ebx, &ecx);
- amd_init_l3_cache(this_leaf, index);
- } else {
- cpuid_count(4, index, &eax.full, &ebx.full, &ecx.full, &edx);
- }
-
- if (eax.split.type == CTYPE_NULL)
- return -EIO; /* better error ? */
-
- this_leaf->eax = eax;
- this_leaf->ebx = ebx;
- this_leaf->ecx = ecx;
- this_leaf->size = (ecx.split.number_of_sets + 1) *
- (ebx.split.coherency_line_size + 1) *
- (ebx.split.physical_line_partition + 1) *
- (ebx.split.ways_of_associativity + 1);
- return 0;
-}
-
-static int find_num_cache_leaves(struct cpuinfo_x86 *c)
-{
- unsigned int eax, ebx, ecx, edx, op;
- union _cpuid4_leaf_eax cache_eax;
- int i = -1;
-
- if (c->x86_vendor == X86_VENDOR_AMD)
- op = 0x8000001d;
- else
- op = 4;
-
- do {
- ++i;
- /* Do cpuid(op) loop to find out num_cache_leaves */
- cpuid_count(op, i, &eax, &ebx, &ecx, &edx);
- cache_eax.full = eax;
- } while (cache_eax.split.type != CTYPE_NULL);
- return i;
-}
-
-void init_amd_cacheinfo(struct cpuinfo_x86 *c)
-{
-
- if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
- num_cache_leaves = find_num_cache_leaves(c);
- } else if (c->extended_cpuid_level >= 0x80000006) {
- if (cpuid_edx(0x80000006) & 0xf000)
- num_cache_leaves = 4;
- else
- num_cache_leaves = 3;
- }
-}
-
-unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c)
-{
- /* Cache sizes */
- unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0;
- unsigned int new_l1d = 0, new_l1i = 0; /* Cache sizes from cpuid(4) */
- unsigned int new_l2 = 0, new_l3 = 0, i; /* Cache sizes from cpuid(4) */
- unsigned int l2_id = 0, l3_id = 0, num_threads_sharing, index_msb;
-#ifdef CONFIG_SMP
- unsigned int cpu = c->cpu_index;
-#endif
-
- if (c->cpuid_level > 3) {
- static int is_initialized;
-
- if (is_initialized == 0) {
- /* Init num_cache_leaves from boot CPU */
- num_cache_leaves = find_num_cache_leaves(c);
- is_initialized++;
- }
-
- /*
- * Whenever possible use cpuid(4), deterministic cache
- * parameters cpuid leaf to find the cache details
- */
- for (i = 0; i < num_cache_leaves; i++) {
- struct _cpuid4_info_regs this_leaf = {};
- int retval;
-
- retval = cpuid4_cache_lookup_regs(i, &this_leaf);
- if (retval < 0)
- continue;
-
- switch (this_leaf.eax.split.level) {
- case 1:
- if (this_leaf.eax.split.type == CTYPE_DATA)
- new_l1d = this_leaf.size/1024;
- else if (this_leaf.eax.split.type == CTYPE_INST)
- new_l1i = this_leaf.size/1024;
- break;
- case 2:
- new_l2 = this_leaf.size/1024;
- num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
- index_msb = get_count_order(num_threads_sharing);
- l2_id = c->apicid & ~((1 << index_msb) - 1);
- break;
- case 3:
- new_l3 = this_leaf.size/1024;
- num_threads_sharing = 1 + this_leaf.eax.split.num_threads_sharing;
- index_msb = get_count_order(num_threads_sharing);
- l3_id = c->apicid & ~((1 << index_msb) - 1);
- break;
- default:
- break;
- }
- }
- }
- /*
- * Don't use cpuid2 if cpuid4 is supported. For P4, we use cpuid2 for
- * trace cache
- */
- if ((num_cache_leaves == 0 || c->x86 == 15) && c->cpuid_level > 1) {
- /* supports eax=2 call */
- int j, n;
- unsigned int regs[4];
- unsigned char *dp = (unsigned char *)regs;
- int only_trace = 0;
-
- if (num_cache_leaves != 0 && c->x86 == 15)
- only_trace = 1;
-
- /* Number of times to iterate */
- n = cpuid_eax(2) & 0xFF;
-
- for (i = 0 ; i < n ; i++) {
- 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++)
- if (regs[j] & (1 << 31))
- regs[j] = 0;
-
- /* Byte 0 is level count, not a descriptor */
- for (j = 1 ; j < 16 ; j++) {
- unsigned char des = dp[j];
- unsigned char k = 0;
-
- /* look up this descriptor in the table */
- while (cache_table[k].descriptor != 0) {
- if (cache_table[k].descriptor == des) {
- if (only_trace && cache_table[k].cache_type != LVL_TRACE)
- break;
- switch (cache_table[k].cache_type) {
- case LVL_1_INST:
- l1i += cache_table[k].size;
- break;
- case LVL_1_DATA:
- l1d += cache_table[k].size;
- break;
- case LVL_2:
- l2 += cache_table[k].size;
- break;
- case LVL_3:
- l3 += cache_table[k].size;
- break;
- case LVL_TRACE:
- trace += cache_table[k].size;
- break;
- }
-
- break;
- }
-
- k++;
- }
- }
- }
- }
-
- if (new_l1d)
- l1d = new_l1d;
-
- if (new_l1i)
- l1i = new_l1i;
-
- if (new_l2) {
- l2 = new_l2;
-#ifdef CONFIG_SMP
- per_cpu(cpu_llc_id, cpu) = l2_id;
-#endif
- }
-
- if (new_l3) {
- l3 = new_l3;
-#ifdef CONFIG_SMP
- per_cpu(cpu_llc_id, cpu) = l3_id;
-#endif
- }
-
-#ifdef CONFIG_SMP
- /*
- * If cpu_llc_id is not yet set, this means cpuid_level < 4 which in
- * turns means that the only possibility is SMT (as indicated in
- * cpuid1). Since cpuid2 doesn't specify shared caches, and we know
- * that SMT shares all caches, we can unconditionally set cpu_llc_id to
- * c->phys_proc_id.
- */
- if (per_cpu(cpu_llc_id, cpu) == BAD_APICID)
- per_cpu(cpu_llc_id, cpu) = c->phys_proc_id;
-#endif
-
- c->x86_cache_size = l3 ? l3 : (l2 ? l2 : (l1i+l1d));
-
- return l2;
-}
-
-static int __cache_amd_cpumap_setup(unsigned int cpu, int index,
- struct _cpuid4_info_regs *base)
-{
- struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
- struct cacheinfo *this_leaf;
- int i, sibling;
-
- /*
- * For L3, always use the pre-calculated cpu_llc_shared_mask
- * to derive shared_cpu_map.
- */
- if (index == 3) {
- for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
- this_cpu_ci = get_cpu_cacheinfo(i);
- if (!this_cpu_ci->info_list)
- continue;
- this_leaf = this_cpu_ci->info_list + index;
- for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
- if (!cpu_online(sibling))
- continue;
- cpumask_set_cpu(sibling,
- &this_leaf->shared_cpu_map);
- }
- }
- } else if (boot_cpu_has(X86_FEATURE_TOPOEXT)) {
- unsigned int apicid, nshared, first, last;
-
- nshared = base->eax.split.num_threads_sharing + 1;
- apicid = cpu_data(cpu).apicid;
- first = apicid - (apicid % nshared);
- last = first + nshared - 1;
-
- for_each_online_cpu(i) {
- this_cpu_ci = get_cpu_cacheinfo(i);
- if (!this_cpu_ci->info_list)
- continue;
-
- apicid = cpu_data(i).apicid;
- if ((apicid < first) || (apicid > last))
- continue;
-
- this_leaf = this_cpu_ci->info_list + index;
-
- for_each_online_cpu(sibling) {
- apicid = cpu_data(sibling).apicid;
- if ((apicid < first) || (apicid > last))
- continue;
- cpumask_set_cpu(sibling,
- &this_leaf->shared_cpu_map);
- }
- }
- } else
- return 0;
-
- return 1;
-}
-
-static void __cache_cpumap_setup(unsigned int cpu, int index,
- struct _cpuid4_info_regs *base)
-{
- struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
- struct cacheinfo *this_leaf, *sibling_leaf;
- unsigned long num_threads_sharing;
- int index_msb, i;
- struct cpuinfo_x86 *c = &cpu_data(cpu);
-
- if (c->x86_vendor == X86_VENDOR_AMD) {
- if (__cache_amd_cpumap_setup(cpu, index, base))
- return;
- }
-
- this_leaf = this_cpu_ci->info_list + index;
- num_threads_sharing = 1 + base->eax.split.num_threads_sharing;
-
- cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
- if (num_threads_sharing == 1)
- return;
-
- index_msb = get_count_order(num_threads_sharing);
-
- for_each_online_cpu(i)
- if (cpu_data(i).apicid >> index_msb == c->apicid >> index_msb) {
- struct cpu_cacheinfo *sib_cpu_ci = get_cpu_cacheinfo(i);
-
- if (i == cpu || !sib_cpu_ci->info_list)
- continue;/* skip if itself or no cacheinfo */
- sibling_leaf = sib_cpu_ci->info_list + index;
- cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
- cpumask_set_cpu(cpu, &sibling_leaf->shared_cpu_map);
- }
-}
-
-static void ci_leaf_init(struct cacheinfo *this_leaf,
- struct _cpuid4_info_regs *base)
-{
- this_leaf->id = base->id;
- this_leaf->attributes = CACHE_ID;
- this_leaf->level = base->eax.split.level;
- this_leaf->type = cache_type_map[base->eax.split.type];
- this_leaf->coherency_line_size =
- base->ebx.split.coherency_line_size + 1;
- this_leaf->ways_of_associativity =
- base->ebx.split.ways_of_associativity + 1;
- this_leaf->size = base->size;
- this_leaf->number_of_sets = base->ecx.split.number_of_sets + 1;
- this_leaf->physical_line_partition =
- base->ebx.split.physical_line_partition + 1;
- this_leaf->priv = base->nb;
-}
-
-static int __init_cache_level(unsigned int cpu)
-{
- struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
-
- if (!num_cache_leaves)
- return -ENOENT;
- if (!this_cpu_ci)
- return -EINVAL;
- this_cpu_ci->num_levels = 3;
- this_cpu_ci->num_leaves = num_cache_leaves;
- return 0;
-}
-
-/*
- * The max shared threads number comes from CPUID.4:EAX[25-14] with input
- * ECX as cache index. Then right shift apicid by the number's order to get
- * cache id for this cache node.
- */
-static void get_cache_id(int cpu, struct _cpuid4_info_regs *id4_regs)
-{
- struct cpuinfo_x86 *c = &cpu_data(cpu);
- unsigned long num_threads_sharing;
- int index_msb;
-
- num_threads_sharing = 1 + id4_regs->eax.split.num_threads_sharing;
- index_msb = get_count_order(num_threads_sharing);
- id4_regs->id = c->apicid >> index_msb;
-}
-
-static int __populate_cache_leaves(unsigned int cpu)
-{
- unsigned int idx, ret;
- struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
- struct cacheinfo *this_leaf = this_cpu_ci->info_list;
- struct _cpuid4_info_regs id4_regs = {};
-
- for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) {
- ret = cpuid4_cache_lookup_regs(idx, &id4_regs);
- if (ret)
- return ret;
- get_cache_id(cpu, &id4_regs);
- ci_leaf_init(this_leaf++, &id4_regs);
- __cache_cpumap_setup(cpu, idx, &id4_regs);
- }
- this_cpu_ci->cpu_map_populated = true;
-
- return 0;
-}
-
-DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
-DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)
git.samba.org / sfrench / cifs-2.6.git / blobdiff