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Message-Id: <1412084912-2767-10-git-send-email-sudeep.holla@arm.com>
Date: Tue, 30 Sep 2014 14:48:30 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Sudeep Holla <sudeep.holla@....com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v5 09/11] ARM64: kernel: add support for cpu cache information
This patch adds support for cacheinfo on ARM64.
On ARMv8, the cache hierarchy can be identified through Cache Level ID
(CLIDR) register while the cache geometry is provided by Cache Size ID
(CCSIDR) register.
Since the architecture doesn't provide any way of detecting the cpus
sharing particular cache, device tree is used for the same purpose.
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
---
arch/arm64/include/asm/cachetype.h | 29 +++++++--
arch/arm64/kernel/Makefile | 2 +-
arch/arm64/kernel/cacheinfo.c | 128 +++++++++++++++++++++++++++++++++++++
arch/arm64/kernel/cpuinfo.c | 12 ----
4 files changed, 152 insertions(+), 19 deletions(-)
create mode 100644 arch/arm64/kernel/cacheinfo.c
diff --git a/arch/arm64/include/asm/cachetype.h b/arch/arm64/include/asm/cachetype.h
index 4c631a0a3609..da2fc9e3cedd 100644
--- a/arch/arm64/include/asm/cachetype.h
+++ b/arch/arm64/include/asm/cachetype.h
@@ -39,24 +39,41 @@
extern unsigned long __icache_flags;
+/*
+ * NumSets, bits[27:13] - (Number of sets in cache) - 1
+ * Associativity, bits[12:3] - (Associativity of cache) - 1
+ * LineSize, bits[2:0] - (Log2(Number of words in cache line)) - 2
+ */
+#define CCSIDR_EL1_WRITE_THROUGH BIT(31)
+#define CCSIDR_EL1_WRITE_BACK BIT(30)
+#define CCSIDR_EL1_READ_ALLOCATE BIT(29)
+#define CCSIDR_EL1_WRITE_ALLOCATE BIT(28)
#define CCSIDR_EL1_LINESIZE_MASK 0x7
#define CCSIDR_EL1_LINESIZE(x) ((x) & CCSIDR_EL1_LINESIZE_MASK)
-
+#define CCSIDR_EL1_ASSOCIATIVITY_SHIFT 3
+#define CCSIDR_EL1_ASSOCIATIVITY_MASK 0x3ff
+#define CCSIDR_EL1_ASSOCIATIVITY(x) \
+ (((x) >> CCSIDR_EL1_ASSOCIATIVITY_SHIFT) & CCSIDR_EL1_ASSOCIATIVITY_MASK)
#define CCSIDR_EL1_NUMSETS_SHIFT 13
-#define CCSIDR_EL1_NUMSETS_MASK (0x7fff << CCSIDR_EL1_NUMSETS_SHIFT)
+#define CCSIDR_EL1_NUMSETS_MASK 0x7fff
#define CCSIDR_EL1_NUMSETS(x) \
- (((x) & CCSIDR_EL1_NUMSETS_MASK) >> CCSIDR_EL1_NUMSETS_SHIFT)
+ (((x) >> CCSIDR_EL1_NUMSETS_SHIFT) & CCSIDR_EL1_NUMSETS_MASK)
+
+#define CACHE_LINESIZE(x) (16 << CCSIDR_EL1_LINESIZE(x))
+#define CACHE_NUMSETS(x) (CCSIDR_EL1_NUMSETS(x) + 1)
+#define CACHE_ASSOCIATIVITY(x) (CCSIDR_EL1_ASSOCIATIVITY(x) + 1)
-extern u64 __attribute_const__ icache_get_ccsidr(void);
+extern u64 __attribute_const__ cache_get_ccsidr(u64 csselr);
+/* Helpers for Level 1 Instruction cache csselr = 1L */
static inline int icache_get_linesize(void)
{
- return 16 << CCSIDR_EL1_LINESIZE(icache_get_ccsidr());
+ return CACHE_LINESIZE(cache_get_ccsidr(1L));
}
static inline int icache_get_numsets(void)
{
- return 1 + CCSIDR_EL1_NUMSETS(icache_get_ccsidr());
+ return CACHE_NUMSETS(cache_get_ccsidr(1L));
}
/*
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index df7ef8768fc2..285cd88c1e37 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -15,7 +15,7 @@ arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \
entry-fpsimd.o process.o ptrace.o setup.o signal.o \
sys.o stacktrace.o time.o traps.o io.o vdso.o \
hyp-stub.o psci.o cpu_ops.o insn.o return_address.o \
- cpuinfo.o
+ cpuinfo.o cacheinfo.o
arm64-obj-$(CONFIG_COMPAT) += sys32.o kuser32.o signal32.o \
sys_compat.o
diff --git a/arch/arm64/kernel/cacheinfo.c b/arch/arm64/kernel/cacheinfo.c
new file mode 100644
index 000000000000..497b0e557bd5
--- /dev/null
+++ b/arch/arm64/kernel/cacheinfo.c
@@ -0,0 +1,128 @@
+/*
+ * ARM64 cacheinfo support
+ *
+ * Copyright (C) 2014 ARM Ltd.
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/bitops.h>
+#include <linux/cacheinfo.h>
+#include <linux/cpu.h>
+#include <linux/compiler.h>
+#include <linux/of.h>
+
+#include <asm/cachetype.h>
+#include <asm/processor.h>
+
+#define MAX_CACHE_LEVEL 7 /* Max 7 level supported */
+/* Ctypen, bits[3(n - 1) + 2 : 3(n - 1)], for n = 1 to 7 */
+#define CLIDR_CTYPE_SHIFT(level) (3 * (level - 1))
+#define CLIDR_CTYPE_MASK(level) (7 << CLIDR_CTYPE_SHIFT(level))
+#define CLIDR_CTYPE(clidr, level) \
+ (((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level))
+
+static inline enum cache_type get_cache_type(int level)
+{
+ u64 clidr;
+
+ if (level > MAX_CACHE_LEVEL)
+ return CACHE_TYPE_NOCACHE;
+ asm volatile ("mrs %x0, clidr_el1" : "=r" (clidr));
+ return CLIDR_CTYPE(clidr, level);
+}
+
+/*
+ * Cache Size Selection Register(CSSELR) selects which Cache Size ID
+ * Register(CCSIDR) is accessible by specifying the required cache
+ * level and the cache type. We need to ensure that no one else changes
+ * CSSELR by calling this in non-preemtible context
+ */
+u64 __attribute_const__ cache_get_ccsidr(u64 csselr)
+{
+ u64 ccsidr;
+
+ WARN_ON(preemptible());
+
+ /* Put value into CSSELR */
+ asm volatile("msr csselr_el1, %x0" : : "r" (csselr));
+ isb();
+ /* Read result out of CCSIDR */
+ asm volatile("mrs %x0, ccsidr_el1" : "=r" (ccsidr));
+
+ return ccsidr;
+}
+
+static void ci_leaf_init(struct cacheinfo *this_leaf,
+ enum cache_type type, unsigned int level)
+{
+ bool is_icache = type & CACHE_TYPE_INST;
+ u64 tmp = cache_get_ccsidr((level - 1) << 1 | is_icache);
+
+ this_leaf->level = level;
+ this_leaf->type = type;
+ this_leaf->coherency_line_size = CACHE_LINESIZE(tmp);
+ this_leaf->number_of_sets = CACHE_NUMSETS(tmp);
+ this_leaf->ways_of_associativity = CACHE_ASSOCIATIVITY(tmp);
+ this_leaf->size = this_leaf->number_of_sets *
+ this_leaf->coherency_line_size * this_leaf->ways_of_associativity;
+ this_leaf->attributes =
+ ((tmp & CCSIDR_EL1_WRITE_THROUGH) ? CACHE_WRITE_THROUGH : 0) |
+ ((tmp & CCSIDR_EL1_WRITE_BACK) ? CACHE_WRITE_BACK : 0) |
+ ((tmp & CCSIDR_EL1_READ_ALLOCATE) ? CACHE_READ_ALLOCATE : 0) |
+ ((tmp & CCSIDR_EL1_WRITE_ALLOCATE) ? CACHE_WRITE_ALLOCATE : 0);
+}
+
+static int __init_cache_level(unsigned int cpu)
+{
+ unsigned int ctype, level, leaves;
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+
+ for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) {
+ ctype = get_cache_type(level);
+ if (ctype == CACHE_TYPE_NOCACHE) {
+ level--;
+ break;
+ }
+ /* Separate instruction and data caches */
+ leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
+ }
+
+ this_cpu_ci->num_levels = level;
+ this_cpu_ci->num_leaves = leaves;
+ return 0;
+}
+
+static int __populate_cache_leaves(unsigned int cpu)
+{
+ unsigned int level, idx;
+ enum cache_type type;
+ struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+ struct cacheinfo *this_leaf = this_cpu_ci->info_list;
+
+ for (idx = 0, level = 1; level <= this_cpu_ci->num_levels &&
+ idx < this_cpu_ci->num_leaves; idx++, level++) {
+ type = get_cache_type(level);
+ if (type == CACHE_TYPE_SEPARATE) {
+ ci_leaf_init(this_leaf++, CACHE_TYPE_DATA, level);
+ ci_leaf_init(this_leaf++, CACHE_TYPE_INST, level);
+ } else {
+ ci_leaf_init(this_leaf++, type, level);
+ }
+ }
+ return 0;
+}
+
+DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
+DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)
diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index 504fdaa8367e..8fc00e919b52 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -202,15 +202,3 @@ void __init cpuinfo_store_boot_cpu(void)
boot_cpu_data = *info;
}
-
-u64 __attribute_const__ icache_get_ccsidr(void)
-{
- u64 ccsidr;
-
- WARN_ON(preemptible());
-
- /* Select L1 I-cache and read its size ID register */
- asm("msr csselr_el1, %1; isb; mrs %0, ccsidr_el1"
- : "=r"(ccsidr) : "r"(1L));
- return ccsidr;
-}
--
1.9.1
--
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