[PATCH RFC 2/3] ARM: kernel: add outer cache support for cacheinfo implementation
Sudeep KarkadaNagesha
Sudeep.KarkadaNagesha at arm.com
Wed Sep 18 12:07:22 EDT 2013
From: Sudeep KarkadaNagesha <sudeep.karkadanagesha at arm.com>
In order to support outer cache in the cacheinfo infrastructure, a new
function 'get_info' is added to outer_cache_fns. This function is used
to get the outer cache information namely: line size, number of ways of
associativity and number of sets.
This patch adds 'get_info' supports to all L2 cache implementations on
ARM except Marvell's Feroceon L2 cache.
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha at arm.com>
---
arch/arm/include/asm/outercache.h | 13 +++++++++++++
arch/arm/kernel/cacheinfo.c | 21 ++++++++++++++++++++-
arch/arm/mm/cache-l2x0.c | 14 ++++++++++++++
arch/arm/mm/cache-tauros2.c | 35 +++++++++++++++++++++++++++++++++++
arch/arm/mm/cache-xsc3l2.c | 15 +++++++++++++++
5 files changed, 97 insertions(+), 1 deletion(-)
diff --git a/arch/arm/include/asm/outercache.h b/arch/arm/include/asm/outercache.h
index f94784f..1471ff2 100644
--- a/arch/arm/include/asm/outercache.h
+++ b/arch/arm/include/asm/outercache.h
@@ -23,7 +23,14 @@
#include <linux/types.h>
+struct outer_cache_info {
+ unsigned int num_ways;
+ unsigned int num_sets;
+ unsigned int line_size;
+};
+
struct outer_cache_fns {
+ void (*get_info)(struct outer_cache_info *info);
void (*inv_range)(unsigned long, unsigned long);
void (*clean_range)(unsigned long, unsigned long);
void (*flush_range)(unsigned long, unsigned long);
@@ -41,6 +48,11 @@ extern struct outer_cache_fns outer_cache;
#ifdef CONFIG_OUTER_CACHE
+static inline void outer_get_info(struct outer_cache_info *info)
+{
+ if (outer_cache.get_info)
+ outer_cache.get_info(info);
+}
static inline void outer_inv_range(phys_addr_t start, phys_addr_t end)
{
if (outer_cache.inv_range)
@@ -83,6 +95,7 @@ static inline void outer_resume(void)
#else
+static inline void outer_get_info(struct outer_cache_info *info) { }
static inline void outer_inv_range(phys_addr_t start, phys_addr_t end)
{ }
static inline void outer_clean_range(phys_addr_t start, phys_addr_t end)
diff --git a/arch/arm/kernel/cacheinfo.c b/arch/arm/kernel/cacheinfo.c
index b8cb00f..631f070 100644
--- a/arch/arm/kernel/cacheinfo.c
+++ b/arch/arm/kernel/cacheinfo.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/smp.h>
+#include <asm/outercache.h>
#include <asm/processor.h>
enum cache_type {
@@ -288,6 +289,21 @@ static void init_cache_level(unsigned int cpu)
} while (++level <= MAX_CACHE_LEVEL);
cache_levels(cpu) = level - 1;
cache_leaves(cpu) = leaves;
+ if (IS_ENABLED(CONFIG_OUTER_CACHE) && outer_cache.get_info)
+ cache_levels(cpu)++, cache_leaves(cpu)++;
+}
+
+static void __outer_cache_info_init(struct cache_info *this_leaf)
+{
+ struct outer_cache_info info;
+
+ outer_get_info(&info);
+
+ this_leaf->type = CACHE_TYPE_UNIFIED;/* record it as Unified */
+ this_leaf->ways_of_associativity = info.num_ways;
+ this_leaf->number_of_sets = info.num_sets;
+ this_leaf->coherency_line_size = info.line_size;
+ this_leaf->size = info.num_ways * info.num_sets * info.line_size;
}
static void cpu_cache_info_init(unsigned int cpu, enum cache_type type,
@@ -297,7 +313,10 @@ static void cpu_cache_info_init(unsigned int cpu, enum cache_type type,
this_leaf = CPU_CACHEINFO_IDX(cpu, index);
this_leaf->info.level = level;
- __cpu_cache_info_init(type, &this_leaf->info);
+ if (type == CACHE_TYPE_NOCACHE) /* must be outer cache */
+ __outer_cache_info_init(&this_leaf->info);
+ else
+ __cpu_cache_info_init(type, &this_leaf->info);
}
static void init_cache_leaves(unsigned int cpu)
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 447da6f..6f0d1fc 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -182,6 +182,15 @@ static void l2x0_inv_all(void)
raw_spin_unlock_irqrestore(&l2x0_lock, flags);
}
+static void l2x0_getinfo(struct outer_cache_info *info)
+{
+ if (!info)
+ return;
+ info->num_ways = get_count_order(l2x0_way_mask);
+ info->line_size = CACHE_LINE_SIZE;
+ info->num_sets = l2x0_size / (info->num_ways * CACHE_LINE_SIZE);
+}
+
static void l2x0_inv_range(unsigned long start, unsigned long end)
{
void __iomem *base = l2x0_base;
@@ -415,6 +424,7 @@ void __init l2x0_init(void __iomem *base, u32 aux_val, u32 aux_mask)
outer_cache.flush_all = l2x0_flush_all;
outer_cache.inv_all = l2x0_inv_all;
outer_cache.disable = l2x0_disable;
+ outer_cache.get_info = l2x0_getinfo;
}
pr_info("%s cache controller enabled\n", type);
@@ -865,6 +875,7 @@ static const struct l2x0_of_data pl310_data = {
.flush_all = l2x0_flush_all,
.inv_all = l2x0_inv_all,
.disable = l2x0_disable,
+ .get_info = l2x0_getinfo,
},
};
@@ -880,6 +891,7 @@ static const struct l2x0_of_data l2x0_data = {
.flush_all = l2x0_flush_all,
.inv_all = l2x0_inv_all,
.disable = l2x0_disable,
+ .get_info = l2x0_getinfo,
},
};
@@ -895,6 +907,7 @@ static const struct l2x0_of_data aurora_with_outer_data = {
.flush_all = l2x0_flush_all,
.inv_all = l2x0_inv_all,
.disable = l2x0_disable,
+ .get_info = l2x0_getinfo,
},
};
@@ -918,6 +931,7 @@ static const struct l2x0_of_data bcm_l2x0_data = {
.flush_all = l2x0_flush_all,
.inv_all = l2x0_inv_all,
.disable = l2x0_disable,
+ .get_info = l2x0_getinfo,
},
};
diff --git a/arch/arm/mm/cache-tauros2.c b/arch/arm/mm/cache-tauros2.c
index 1be0f4e..3a43401 100644
--- a/arch/arm/mm/cache-tauros2.c
+++ b/arch/arm/mm/cache-tauros2.c
@@ -60,6 +60,7 @@ static inline void tauros2_inv_pa(unsigned long addr)
* noninclusive.
*/
#define CACHE_LINE_SIZE 32
+#define CACHE_LINE_SHIFT 5
static void tauros2_inv_range(unsigned long start, unsigned long end)
{
@@ -131,6 +132,38 @@ static void tauros2_resume(void)
"mcr p15, 0, %0, c1, c0, 0 @Enable L2 Cache\n\t"
: : "r" (0x0));
}
+
+/*
+ * +----------------------------------------+
+ * | 11 10 9 8 | 7 6 5 4 3 | 2 | 1 0 |
+ * +----------------------------------------+
+ * | way size | associativity | - |line_sz|
+ * +----------------------------------------+
+ */
+#define L2CTR_ASSOCIAT_SHIFT 3
+#define L2CTR_ASSOCIAT_MASK 0x1F
+#define L2CTR_WAYSIZE_SHIFT 8
+#define L2CTR_WAYSIZE_MASK 0xF
+#define CACHE_WAY_PER_SET(l2ctr) \
+ (((l2_ctr) >> L2CTR_ASSOCIAT_SHIFT) & L2CTR_ASSOCIAT_MASK)
+#define CACHE_WAY_SIZE(l2ctr) \
+ (8192 << (((l2ctr) >> L2CTR_WAYSIZE_SHIFT) & L2CTR_WAYSIZE_MASK))
+#define CACHE_SET_SIZE(l2ctr) (CACHE_WAY_SIZE(l2ctr) >> CACHE_LINE_SHIFT)
+
+static void tauros2_getinfo(struct outer_cache_info *info)
+{
+ unsigned int l2_ctr;
+
+ if (!info)
+ return;
+
+ __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2_ctr));
+
+ info->line_size = CACHE_LINE_SIZE;
+ info->num_ways = CACHE_WAY_PER_SET(l2_ctr);
+ info->num_sets = CACHE_SET_SIZE(l2_ctr);
+}
+
#endif
static inline u32 __init read_extra_features(void)
@@ -226,6 +259,7 @@ static void __init tauros2_internal_init(unsigned int features)
outer_cache.flush_range = tauros2_flush_range;
outer_cache.disable = tauros2_disable;
outer_cache.resume = tauros2_resume;
+ outer_cache.get_info = tauros2_getinfo;
}
#endif
@@ -253,6 +287,7 @@ static void __init tauros2_internal_init(unsigned int features)
outer_cache.flush_range = tauros2_flush_range;
outer_cache.disable = tauros2_disable;
outer_cache.resume = tauros2_resume;
+ outer_cache.get_info = tauros2_getinfo;
}
#endif
diff --git a/arch/arm/mm/cache-xsc3l2.c b/arch/arm/mm/cache-xsc3l2.c
index 6c3edeb..353c642 100644
--- a/arch/arm/mm/cache-xsc3l2.c
+++ b/arch/arm/mm/cache-xsc3l2.c
@@ -201,6 +201,20 @@ static void xsc3_l2_flush_range(unsigned long start, unsigned long end)
dsb();
}
+static void xsc3_l2_getinfo(struct outer_cache_info *info)
+{
+ unsigned long l2ctype;
+
+ if (!info)
+ return;
+
+ __asm__("mrc p15, 1, %0, c0, c0, 1" : "=r" (l2ctype));
+
+ info->num_ways = CACHE_WAY_PER_SET;
+ info->line_size = CACHE_LINE_SIZE;
+ info->num_sets = CACHE_SET_SIZE(l2ctype);
+}
+
static int __init xsc3_l2_init(void)
{
if (!cpu_is_xsc3() || !xsc3_l2_present())
@@ -213,6 +227,7 @@ static int __init xsc3_l2_init(void)
outer_cache.inv_range = xsc3_l2_inv_range;
outer_cache.clean_range = xsc3_l2_clean_range;
outer_cache.flush_range = xsc3_l2_flush_range;
+ outer_cache.get_info = xsc3_l2_getinfo;
}
return 0;
--
1.8.1.2
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