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Subject[tip:x86/cpu] x86, cacheinfo: Reorganize AMD L3 cache structure
Commit-ID:  9350f982e4fe539e83a2d4a13e9b53ad8253c4a8
Gitweb: http://git.kernel.org/tip/9350f982e4fe539e83a2d4a13e9b53ad8253c4a8
Author: Borislav Petkov <borislav.petkov@amd.com>
AuthorDate: Thu, 22 Apr 2010 16:07:00 +0200
Committer: H. Peter Anvin <hpa@zytor.com>
CommitDate: Thu, 22 Apr 2010 17:17:23 -0700

x86, cacheinfo: Reorganize AMD L3 cache structure

Add a struct representing L3 cache attributes (subcache sizes and
indices count) and move the respective members out of _cpuid4_info.
Also, stash the struct pci_dev ptr into the struct simplifying the code
even more.

There should be no functionality change resulting from this patch except
slightly slimming the _cpuid4_info per-cpu vars.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
LKML-Reference: <1271945222-5283-4-git-send-email-bp@amd64.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/kernel/cpu/intel_cacheinfo.c | 53 ++++++++++++++++++++-------------
1 files changed, 32 insertions(+), 21 deletions(-)
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 5ab14c8..ff663ca 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -148,13 +148,19 @@ union _cpuid4_leaf_ecx {
u32 full;
};

+struct amd_l3_cache {
+ struct pci_dev *dev;
+ bool can_disable;
+ unsigned indices;
+ u8 subcaches[4];
+};
+
struct _cpuid4_info {
union _cpuid4_leaf_eax eax;
union _cpuid4_leaf_ebx ebx;
union _cpuid4_leaf_ecx ecx;
unsigned long size;
- bool can_disable;
- unsigned int l3_indices;
+ struct amd_l3_cache *l3;
DECLARE_BITMAP(shared_cpu_map, NR_CPUS);
};

@@ -164,8 +170,7 @@ struct _cpuid4_info_regs {
union _cpuid4_leaf_ebx ebx;
union _cpuid4_leaf_ecx ecx;
unsigned long size;
- bool can_disable;
- unsigned int l3_indices;
+ struct amd_l3_cache *l3;
};

unsigned short num_cache_leaves;
@@ -302,7 +307,7 @@ struct _cache_attr {
};

#ifdef CONFIG_CPU_SUP_AMD
-static unsigned int __cpuinit amd_calc_l3_indices(void)
+static void __cpuinit amd_calc_l3_indices(struct amd_l3_cache *l3)
{
/*
* We're called over smp_call_function_single() and therefore
@@ -317,12 +322,14 @@ static unsigned int __cpuinit amd_calc_l3_indices(void)
pci_read_config_dword(dev, 0x1C4, &val);

/* calculate subcache sizes */
- sc0 = !(val & BIT(0));
- sc1 = !(val & BIT(4));
- sc2 = !(val & BIT(8)) + !(val & BIT(9));
- sc3 = !(val & BIT(12)) + !(val & BIT(13));
+ l3->subcaches[0] = sc0 = !(val & BIT(0));
+ l3->subcaches[1] = sc1 = !(val & BIT(4));
+ l3->subcaches[2] = sc2 = !(val & BIT(8)) + !(val & BIT(9));
+ l3->subcaches[3] = sc3 = !(val & BIT(12)) + !(val & BIT(13));
+
+ l3->indices = (max(max(max(sc0, sc1), sc2), sc3) << 10) - 1;

- return (max(max(max(sc0, sc1), sc2), sc3) << 10) - 1;
+ l3->dev = dev;
}

static void __cpuinit
@@ -348,19 +355,23 @@ amd_check_l3_disable(int index, struct _cpuid4_info_regs *this_leaf)
if (num_k8_northbridges == 0)
return;

- this_leaf->can_disable = true;
- this_leaf->l3_indices = amd_calc_l3_indices();
+ this_leaf->l3 = kzalloc(sizeof(struct amd_l3_cache), GFP_ATOMIC);
+ if (!this_leaf->l3) {
+ printk(KERN_WARNING "Error allocating L3 struct\n");
+ return;
+ }
+
+ this_leaf->l3->can_disable = true;
+ amd_calc_l3_indices(this_leaf->l3);
}

static ssize_t show_cache_disable(struct _cpuid4_info *this_leaf, char *buf,
unsigned int index)
{
- int cpu = cpumask_first(to_cpumask(this_leaf->shared_cpu_map));
- int node = amd_get_nb_id(cpu);
- struct pci_dev *dev = node_to_k8_nb_misc(node);
+ struct pci_dev *dev = this_leaf->l3->dev;
unsigned int reg = 0;

- if (!this_leaf->can_disable)
+ if (!this_leaf->l3 || !this_leaf->l3->can_disable)
return -EINVAL;

if (!dev)
@@ -382,15 +393,14 @@ SHOW_CACHE_DISABLE(1)
static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
const char *buf, size_t count, unsigned int index)
{
+ struct pci_dev *dev = this_leaf->l3->dev;
int cpu = cpumask_first(to_cpumask(this_leaf->shared_cpu_map));
- int node = amd_get_nb_id(cpu);
- struct pci_dev *dev = node_to_k8_nb_misc(node);
unsigned long val = 0;

#define SUBCACHE_MASK (3UL << 20)
#define SUBCACHE_INDEX 0xfff

- if (!this_leaf->can_disable)
+ if (!this_leaf->l3 || !this_leaf->l3->can_disable)
return -EINVAL;

if (!capable(CAP_SYS_ADMIN))
@@ -404,7 +414,7 @@ static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,

/* do not allow writes outside of allowed bits */
if ((val & ~(SUBCACHE_MASK | SUBCACHE_INDEX)) ||
- ((val & SUBCACHE_INDEX) > this_leaf->l3_indices))
+ ((val & SUBCACHE_INDEX) > this_leaf->l3->indices))
return -EINVAL;

val |= BIT(30);
@@ -708,6 +718,7 @@ static void __cpuinit free_cache_attributes(unsigned int cpu)
for (i = 0; i < num_cache_leaves; i++)
cache_remove_shared_cpu_map(cpu, i);

+ kfree(per_cpu(ici_cpuid4_info, cpu)->l3);
kfree(per_cpu(ici_cpuid4_info, cpu));
per_cpu(ici_cpuid4_info, cpu) = NULL;
}
@@ -992,7 +1003,7 @@ static int __cpuinit cache_add_dev(struct sys_device * sys_dev)

this_leaf = CPUID4_INFO_IDX(cpu, i);

- if (this_leaf->can_disable)
+ if (this_leaf->l3 && this_leaf->l3->can_disable)
ktype_cache.default_attrs = default_l3_attrs;
else
ktype_cache.default_attrs = default_attrs;

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