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([2401:4900:1c45:45a3:affe:4635:b6b6:1a76]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73dbfaad42fsm3430658b3a.121.2025.04.19.08.49.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 19 Apr 2025 08:49:22 -0700 (PDT) From: Sahil Siddiq To: jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com Cc: linux-openrisc@vger.kernel.org, linux-kernel@vger.kernel.org, Sahil Siddiq Subject: [PATCH v6 3/3] openrisc: Add cacheinfo support Date: Sat, 19 Apr 2025 21:18:19 +0530 Message-ID: <20250419154819.85063-4-sahilcdq0@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250419154819.85063-1-sahilcdq0@gmail.com> References: <20250419154819.85063-1-sahilcdq0@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add cacheinfo support for OpenRISC. Currently, a few CPU cache attributes pertaining to OpenRISC processors are exposed along with other unrelated CPU attributes in the procfs file system (/proc/cpuinfo). However, a few cache attributes remain unexposed. Provide a mechanism that the generic cacheinfo infrastructure can employ to expose these attributes via the sysfs file system. These attributes can then be exposed in /sys/devices/system/cpu/cpuX/cache/indexN. Move the implementation to pull cache attributes from the processor's registers from arch/openrisc/kernel/setup.c with a few modifications. This implementation is based on similar work done for MIPS and LoongArch. Link: https://raw.githubusercontent.com/openrisc/doc/master/openrisc-arch-1= .4-rev0.pdf Signed-off-by: Sahil Siddiq --- Changes v5 -> v6: - Changed 'From' and signed-off-by email addresses. arch/openrisc/kernel/Makefile | 2 +- arch/openrisc/kernel/cacheinfo.c | 104 +++++++++++++++++++++++++++++++ arch/openrisc/kernel/setup.c | 44 +------------ 3 files changed, 108 insertions(+), 42 deletions(-) create mode 100644 arch/openrisc/kernel/cacheinfo.c diff --git a/arch/openrisc/kernel/Makefile b/arch/openrisc/kernel/Makefile index 79129161f3e0..e4c7d9bdd598 100644 --- a/arch/openrisc/kernel/Makefile +++ b/arch/openrisc/kernel/Makefile @@ -7,7 +7,7 @@ extra-y :=3D vmlinux.lds =20 obj-y :=3D head.o setup.o or32_ksyms.o process.o dma.o \ traps.o time.o irq.o entry.o ptrace.o signal.o \ - sys_call_table.o unwinder.o + sys_call_table.o unwinder.o cacheinfo.o =20 obj-$(CONFIG_SMP) +=3D smp.o sync-timer.o obj-$(CONFIG_STACKTRACE) +=3D stacktrace.o diff --git a/arch/openrisc/kernel/cacheinfo.c b/arch/openrisc/kernel/cachei= nfo.c new file mode 100644 index 000000000000..61230545e4ff --- /dev/null +++ b/arch/openrisc/kernel/cacheinfo.c @@ -0,0 +1,104 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * OpenRISC cacheinfo support + * + * Based on work done for MIPS and LoongArch. All original copyrights + * apply as per the original source declaration. + * + * OpenRISC implementation: + * Copyright (C) 2025 Sahil Siddiq + */ + +#include +#include +#include +#include + +static inline void ci_leaf_init(struct cacheinfo *this_leaf, enum cache_ty= pe type, + unsigned int level, struct cache_desc *cache, int cpu) +{ + this_leaf->type =3D type; + this_leaf->level =3D level; + this_leaf->coherency_line_size =3D cache->block_size; + this_leaf->number_of_sets =3D cache->sets; + this_leaf->ways_of_associativity =3D cache->ways; + this_leaf->size =3D cache->size; + cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map); +} + +int init_cache_level(unsigned int cpu) +{ + struct cpuinfo_or1k *cpuinfo =3D &cpuinfo_or1k[smp_processor_id()]; + struct cpu_cacheinfo *this_cpu_ci =3D get_cpu_cacheinfo(cpu); + int leaves =3D 0, levels =3D 0; + unsigned long upr =3D mfspr(SPR_UPR); + unsigned long iccfgr, dccfgr; + + if (!(upr & SPR_UPR_UP)) { + printk(KERN_INFO + "-- no UPR register... unable to detect configuration\n"); + return -ENOENT; + } + + if (cpu_cache_is_present(SPR_UPR_DCP)) { + dccfgr =3D mfspr(SPR_DCCFGR); + cpuinfo->dcache.ways =3D 1 << (dccfgr & SPR_DCCFGR_NCW); + cpuinfo->dcache.sets =3D 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3); + cpuinfo->dcache.block_size =3D 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7); + cpuinfo->dcache.size =3D + cpuinfo->dcache.sets * cpuinfo->dcache.ways * cpuinfo->dcache.block_= size; + leaves +=3D 1; + printk(KERN_INFO + "-- dcache: %d bytes total, %d bytes/line, %d set(s), %d way(s)\n= ", + cpuinfo->dcache.size, cpuinfo->dcache.block_size, + cpuinfo->dcache.sets, cpuinfo->dcache.ways); + } else + printk(KERN_INFO "-- dcache disabled\n"); + + if (cpu_cache_is_present(SPR_UPR_ICP)) { + iccfgr =3D mfspr(SPR_ICCFGR); + cpuinfo->icache.ways =3D 1 << (iccfgr & SPR_ICCFGR_NCW); + cpuinfo->icache.sets =3D 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3); + cpuinfo->icache.block_size =3D 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7); + cpuinfo->icache.size =3D + cpuinfo->icache.sets * cpuinfo->icache.ways * cpuinfo->icache.block_= size; + leaves +=3D 1; + printk(KERN_INFO + "-- icache: %d bytes total, %d bytes/line, %d set(s), %d way(s)\n= ", + cpuinfo->icache.size, cpuinfo->icache.block_size, + cpuinfo->icache.sets, cpuinfo->icache.ways); + } else + printk(KERN_INFO "-- icache disabled\n"); + + if (!leaves) + return -ENOENT; + + levels =3D 1; + + this_cpu_ci->num_leaves =3D leaves; + this_cpu_ci->num_levels =3D levels; + + return 0; +} + +int populate_cache_leaves(unsigned int cpu) +{ + struct cpuinfo_or1k *cpuinfo =3D &cpuinfo_or1k[smp_processor_id()]; + struct cpu_cacheinfo *this_cpu_ci =3D get_cpu_cacheinfo(cpu); + struct cacheinfo *this_leaf =3D this_cpu_ci->info_list; + int level =3D 1; + + if (cpu_cache_is_present(SPR_UPR_DCP)) { + ci_leaf_init(this_leaf, CACHE_TYPE_DATA, level, &cpuinfo->dcache, cpu); + this_leaf->attributes =3D ((mfspr(SPR_DCCFGR) & SPR_DCCFGR_CWS) >> 8) ? + CACHE_WRITE_BACK : CACHE_WRITE_THROUGH; + this_leaf++; + } + + if (cpu_cache_is_present(SPR_UPR_ICP)) + ci_leaf_init(this_leaf, CACHE_TYPE_INST, level, &cpuinfo->icache, cpu); + + this_cpu_ci->cpu_map_populated =3D true; + + return 0; +} diff --git a/arch/openrisc/kernel/setup.c b/arch/openrisc/kernel/setup.c index 66207cd7bb9e..a9fb9cc6779e 100644 --- a/arch/openrisc/kernel/setup.c +++ b/arch/openrisc/kernel/setup.c @@ -113,21 +113,6 @@ static void print_cpuinfo(void) return; } =20 - if (upr & SPR_UPR_DCP) - printk(KERN_INFO - "-- dcache: %4d bytes total, %2d bytes/line, %d set(s), %d way(s)= \n", - cpuinfo->dcache.size, cpuinfo->dcache.block_size, - cpuinfo->dcache.sets, cpuinfo->dcache.ways); - else - printk(KERN_INFO "-- dcache disabled\n"); - if (upr & SPR_UPR_ICP) - printk(KERN_INFO - "-- icache: %4d bytes total, %2d bytes/line, %d set(s), %d way(s)= \n", - cpuinfo->icache.size, cpuinfo->icache.block_size, - cpuinfo->icache.sets, cpuinfo->icache.ways); - else - printk(KERN_INFO "-- icache disabled\n"); - if (upr & SPR_UPR_DMP) printk(KERN_INFO "-- dmmu: %4d entries, %lu way(s)\n", 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), @@ -155,7 +140,6 @@ static void print_cpuinfo(void) void __init setup_cpuinfo(void) { struct device_node *cpu; - unsigned long iccfgr, dccfgr; int cpu_id =3D smp_processor_id(); struct cpuinfo_or1k *cpuinfo =3D &cpuinfo_or1k[cpu_id]; =20 @@ -163,20 +147,6 @@ void __init setup_cpuinfo(void) if (!cpu) panic("Couldn't find CPU%d in device tree...\n", cpu_id); =20 - iccfgr =3D mfspr(SPR_ICCFGR); - cpuinfo->icache.ways =3D 1 << (iccfgr & SPR_ICCFGR_NCW); - cpuinfo->icache.sets =3D 1 << ((iccfgr & SPR_ICCFGR_NCS) >> 3); - cpuinfo->icache.block_size =3D 16 << ((iccfgr & SPR_ICCFGR_CBS) >> 7); - cpuinfo->icache.size =3D - cpuinfo->icache.sets * cpuinfo->icache.ways * cpuinfo->icache.block_s= ize; - - dccfgr =3D mfspr(SPR_DCCFGR); - cpuinfo->dcache.ways =3D 1 << (dccfgr & SPR_DCCFGR_NCW); - cpuinfo->dcache.sets =3D 1 << ((dccfgr & SPR_DCCFGR_NCS) >> 3); - cpuinfo->dcache.block_size =3D 16 << ((dccfgr & SPR_DCCFGR_CBS) >> 7); - cpuinfo->dcache.size =3D - cpuinfo->dcache.sets * cpuinfo->dcache.ways * cpuinfo->dcache.block_s= ize; - if (of_property_read_u32(cpu, "clock-frequency", &cpuinfo->clock_frequency)) { printk(KERN_WARNING @@ -293,14 +263,14 @@ static int show_cpuinfo(struct seq_file *m, void *v) unsigned int vr, cpucfgr; unsigned int avr; unsigned int version; +#ifdef CONFIG_SMP struct cpuinfo_or1k *cpuinfo =3D v; + seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid); +#endif =20 vr =3D mfspr(SPR_VR); cpucfgr =3D mfspr(SPR_CPUCFGR); =20 -#ifdef CONFIG_SMP - seq_printf(m, "processor\t\t: %d\n", cpuinfo->coreid); -#endif if (vr & SPR_VR_UVRP) { vr =3D mfspr(SPR_VR2); version =3D vr & SPR_VR2_VER; @@ -319,14 +289,6 @@ static int show_cpuinfo(struct seq_file *m, void *v) seq_printf(m, "revision\t\t: %d\n", vr & SPR_VR_REV); } seq_printf(m, "frequency\t\t: %ld\n", loops_per_jiffy * HZ); - seq_printf(m, "dcache size\t\t: %d bytes\n", cpuinfo->dcache.size); - seq_printf(m, "dcache block size\t: %d bytes\n", - cpuinfo->dcache.block_size); - seq_printf(m, "dcache ways\t\t: %d\n", cpuinfo->dcache.ways); - seq_printf(m, "icache size\t\t: %d bytes\n", cpuinfo->icache.size); - seq_printf(m, "icache block size\t: %d bytes\n", - cpuinfo->icache.block_size); - seq_printf(m, "icache ways\t\t: %d\n", cpuinfo->icache.ways); seq_printf(m, "immu\t\t\t: %d entries, %lu ways\n", 1 << ((mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTS) >> 2), 1 + (mfspr(SPR_DMMUCFGR) & SPR_DMMUCFGR_NTW)); --=20 2.48.1