From patchwork Fri Jul 25 16:44:51 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 4624701 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id F27079F36A for ; Fri, 25 Jul 2014 16:47:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B13F42017D for ; Fri, 25 Jul 2014 16:47:20 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 69C8720158 for ; Fri, 25 Jul 2014 16:47:19 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XAicW-0006Lw-JE; Fri, 25 Jul 2014 16:45:24 +0000 Received: from fw-tnat.cambridge.arm.com ([217.140.96.21] helo=cam-smtp0.cambridge.arm.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XAicG-00053M-80 for linux-arm-kernel@lists.infradead.org; Fri, 25 Jul 2014 16:45:09 +0000 Received: from e103737-lin.cambridge.arm.com (e103737-lin.cambridge.arm.com [10.1.207.61]) by cam-smtp0.cambridge.arm.com (8.13.8/8.13.8) with ESMTP id s6PGiX0K031501; Fri, 25 Jul 2014 17:44:37 +0100 From: Sudeep Holla To: LKML Subject: [PATCH v2 8/9] ARM: kernel: add support for cpu cache information Date: Fri, 25 Jul 2014 17:44:51 +0100 Message-Id: <1406306692-7135-9-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1406306692-7135-1-git-send-email-sudeep.holla@arm.com> References: <1403717444-23559-1-git-send-email-sudeep.holla@arm.com> <1406306692-7135-1-git-send-email-sudeep.holla@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140725_094508_800236_EEC922C3 X-CRM114-Status: GOOD ( 26.79 ) X-Spam-Score: -2.3 (--) Cc: Nicolas Pitre , Lorenzo Pieralisi , Russell King , Will Deacon , Heiko Carstens , sudeep.holla@arm.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Sudeep Holla This patch adds support for cacheinfo on ARM platforms. On ARMv7, the cache hierarchy can be identified through Cache Level ID register(CLIDR) while the cache geometry is provided by Cache Size ID register(CCSIDR). On architecture versions before ARMv7, CLIDR and CCSIDR is not implemented. The cache type register(CTR) provides both cache hierarchy and geometry if implemented. For implementations that doesn't support CTR, we need to list the probable value of CTR if it was implemented along with the cpuid for the sake of simplicity to handle them. Since the architecture doesn't provide any way of detecting the cpus sharing particular cache, device tree is used fo the same purpose. On non-DT platforms, first level caches are per-cpu while higher level caches are assumed system-wide. Signed-off-by: Sudeep Holla Cc: Russell King Cc: Will Deacon Cc: Nicolas Pitre Cc: Lorenzo Pieralisi Cc: linux-arm-kernel@lists.infradead.org --- arch/arm/kernel/Makefile | 1 + arch/arm/kernel/cacheinfo.c | 272 ++++++++++++++++++++++++++++++++++++++++++++ arch/arm/mm/Kconfig | 13 +++ 3 files changed, 286 insertions(+) create mode 100644 arch/arm/kernel/cacheinfo.c --->8 Hi Russell, Since for few CPUs like ARM11MP core which implements VMSAv6 + Advanced OS Features, Linux returns cpu_architecture as armv7, I have added a list for that as they are armv6 and don't implement CLIDR and group. Let me know if there's any alternative to handle that. This also depends on your patch "ARM: make it easier to check the CPU part number correctly" Regards, Sudeep diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 38ddd9f83d0e..2c5ff0efb670 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -29,6 +29,7 @@ obj-y += entry-v7m.o v7m.o else obj-y += entry-armv.o endif +obj-$(CONFIG_CPU_HAS_CACHE) += cacheinfo.o obj-$(CONFIG_OC_ETM) += etm.o obj-$(CONFIG_CPU_IDLE) += cpuidle.o diff --git a/arch/arm/kernel/cacheinfo.c b/arch/arm/kernel/cacheinfo.c new file mode 100644 index 000000000000..427ba641b33a --- /dev/null +++ b/arch/arm/kernel/cacheinfo.c @@ -0,0 +1,272 @@ +/* + * ARM cacheinfo support + * + * Copyright (C) 2014 ARM Ltd. + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +#define cache_is_armv7() \ + (cpu_architecture() >= CPU_ARCH_ARMv7 && !armv6_extended()) +#define MAX_CACHE_LEVEL (cache_is_armv7() ? 7 : 1) + +#define CTR_CTYPE_SHIFT 24 +#define CTR_CTYPE_MASK (1 << CTR_CTYPE_SHIFT) + +struct ctr_info { + unsigned int cpuid_part; + unsigned int ctr; +}; +/* + * Cache Type Register + * +---------------------------------+ + * | 31 29 | 28 25 |24| 23 12 | 11 0 | + * +---------------------------------+ + * | 0 0 0 | Ctype | S| Dsize | Isize| + * +---------------------------------+ + * The table below encodes only Dsize and Isize + */ +static struct ctr_info cache_ctr_list[] = { + {0x4400a100, 0x0016A16A }, /* 32kB D$, 32kB I$ */ + {0x4400a110, 0x0012A16A }, /* 16kB D$, 32kB I$ */ + {0x6900b110, 0x0012A16A }, /* 16kB D$, 32kB I$ */ +}; + +/* + * List of CPUs reported as ARMv7 but don't implement CLIDR, + * CSSELR and CCSIDR. Cache information is still available from CTR + */ +static int armv6_ext_cpuid_part[] = { 0x4100b020, }; + +static bool armv6_extended(void) +{ + int i, cpuid_part = read_cpuid_part(); + + for (i = 0; i < ARRAY_SIZE(armv6_ext_cpuid_part); i++) + if (armv6_ext_cpuid_part[i] == cpuid_part) + return true; + return false; +} + +static int get_unimplemented_ctr(unsigned int *ctr) +{ + int i, cpuid_part = read_cpuid_part(); + + for (i = 0; i < ARRAY_SIZE(cache_ctr_list); i++) + if (cache_ctr_list[i].cpuid_part == cpuid_part) { + *ctr = cache_ctr_list[i].ctr; + return 0; + } + return -ENOENT; +} + +static unsigned int get_ctr(void) +{ + unsigned int ctr; + + if (get_unimplemented_ctr(&ctr)) + ctr = read_cpuid_cachetype(); + return ctr; +} + +static enum cache_type __get_cache_type(int level) +{ + if (level > MAX_CACHE_LEVEL) + return CACHE_TYPE_NOCACHE; + return get_ctr() & CTR_CTYPE_MASK ? + CACHE_TYPE_SEPARATE : CACHE_TYPE_UNIFIED; +} + +/* + * +---------------------------------+ + * | 9 8 7 6 | 5 4 3 | 2 | 1 0 | + * +---------------------------------+ + * | size | assoc | m | len | + * +---------------------------------+ + * linelen = 1 << (len + 3) + * multiplier = 2 + m + * nsets = 1 << (size + 6 - assoc - len) + * associativity = multiplier << (assoc - 1) + * cache_size = multiplier << (size + 8) + */ +#define CTR_LINESIZE_MASK 0x3 +#define CTR_MULTIPLIER_SHIFT 2 +#define CTR_MULTIPLIER_MASK 0x1 +#define CTR_ASSOCIAT_SHIFT 3 +#define CTR_ASSOCIAT_MASK 0x7 +#define CTR_SIZE_SHIFT 6 +#define CTR_SIZE_MASK 0xF +#define CTR_DCACHE_SHIFT 12 + +static void __ci_leaf_init(enum cache_type type, struct cacheinfo *this_leaf) +{ + unsigned int size, multiplier, assoc, len, tmp = get_ctr(); + + if (type == CACHE_TYPE_DATA) + tmp >>= CTR_DCACHE_SHIFT; + + len = tmp & CTR_LINESIZE_MASK; + size = (tmp >> CTR_SIZE_SHIFT) & CTR_SIZE_MASK; + assoc = (tmp >> CTR_ASSOCIAT_SHIFT) & CTR_ASSOCIAT_MASK; + multiplier = ((tmp >> CTR_MULTIPLIER_SHIFT) & CTR_MULTIPLIER_MASK) + 2; + + this_leaf->type = type; + this_leaf->coherency_line_size = 1 << (len + 3); + this_leaf->number_of_sets = 1 << (size + 6 - assoc - len); + this_leaf->ways_of_associativity = multiplier << (assoc - 1); + this_leaf->size = multiplier << (size + 8); +} + +/* 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 __armv7_get_cache_type(int level) +{ + unsigned int clidr; + + if (level > MAX_CACHE_LEVEL) + return CACHE_TYPE_NOCACHE; + asm volatile ("mrc p15, 1, %0, c0, c0, 1" : "=r" (clidr)); + return CLIDR_CTYPE(clidr, level); +} + +/* + * 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_WRITE_THROUGH BIT(31) +#define CCSIDR_WRITE_BACK BIT(30) +#define CCSIDR_READ_ALLOCATE BIT(29) +#define CCSIDR_WRITE_ALLOCATE BIT(28) +#define CCSIDR_LINESIZE_MASK 0x7 +#define CCSIDR_ASSOCIATIVITY_SHIFT 3 +#define CCSIDR_ASSOCIATIVITY_MASK 0x3FF +#define CCSIDR_NUMSETS_SHIFT 13 +#define CCSIDR_NUMSETS_MASK 0x7FF + +/* + * Which cache CCSIDR represents depends on CSSELR value + * Make sure no one else changes CSSELR during this + * smp_call_function_single prevents preemption for us + */ +static inline u32 get_ccsidr(u32 csselr) +{ + u32 ccsidr; + + /* Put value into CSSELR */ + asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (csselr)); + isb(); + /* Read result out of CCSIDR */ + asm volatile ("mrc p15, 1, %0, c0, c0, 0" : "=r" (ccsidr)); + + return ccsidr; +} + +static void __armv7_ci_leaf_init(enum cache_type type, + struct cacheinfo *this_leaf) +{ + bool is_instr_cache = type & CACHE_TYPE_INST; + u32 tmp = get_ccsidr((this_leaf->level - 1) << 1 | is_instr_cache); + + this_leaf->type = type; + this_leaf->coherency_line_size = + (1 << ((tmp & CCSIDR_LINESIZE_MASK) + 2)) * 4; + this_leaf->number_of_sets = + ((tmp >> CCSIDR_NUMSETS_SHIFT) & CCSIDR_NUMSETS_MASK) + 1; + this_leaf->ways_of_associativity = ((tmp >> CCSIDR_ASSOCIATIVITY_SHIFT) + & CCSIDR_ASSOCIATIVITY_MASK) + 1; + this_leaf->size = this_leaf->number_of_sets * + this_leaf->coherency_line_size * this_leaf->ways_of_associativity; + this_leaf->attributes = + ((tmp & CCSIDR_WRITE_THROUGH) ? CACHE_WRITE_THROUGH : 0) | + ((tmp & CCSIDR_WRITE_BACK) ? CACHE_WRITE_BACK : 0) | + ((tmp & CCSIDR_READ_ALLOCATE) ? CACHE_READ_ALLOCATE : 0) | + ((tmp & CCSIDR_WRITE_ALLOCATE) ? CACHE_WRITE_ALLOCATE : 0); +} + +static inline enum cache_type get_cache_type(int level) +{ + if (cache_is_armv7()) + return __armv7_get_cache_type(level); + else + return __get_cache_type(level); +} + +static void ci_leaf_init(struct cacheinfo *this_leaf, + enum cache_type type, unsigned int level) +{ + this_leaf->level = level; + if (cache_is_armv7()) + __armv7_ci_leaf_init(type, this_leaf); + else + __ci_leaf_init(type, this_leaf); +} + +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_FUNCTION(init_cache_level) +DEFINE_SMP_CALL_FUNCTION(populate_cache_leaves) diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index c348eaee7ee2..153abc3bac4e 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -494,30 +494,42 @@ config CPU_PABRT_V7 # The cache model config CPU_CACHE_V4 bool + select CPU_HAS_CACHE config CPU_CACHE_V4WT bool + select CPU_HAS_CACHE config CPU_CACHE_V4WB bool + select CPU_HAS_CACHE config CPU_CACHE_V6 bool + select CPU_HAS_CACHE config CPU_CACHE_V7 bool + select CPU_HAS_CACHE config CPU_CACHE_NOP bool + select CPU_HAS_CACHE config CPU_CACHE_VIVT bool + select CPU_HAS_CACHE config CPU_CACHE_VIPT bool + select CPU_HAS_CACHE config CPU_CACHE_FA bool + select CPU_HAS_CACHE + +config CPU_HAS_CACHE + bool if MMU # The copy-page model @@ -845,6 +857,7 @@ config DMA_CACHE_RWFO config OUTER_CACHE bool + select CPU_HAS_CACHE config OUTER_CACHE_SYNC bool