From 65e01f386fcddb3460be78fc886856889f80ecc7 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Sun, 8 Jan 2017 17:31:48 -0600 Subject: [PATCH] powerpc/64: Add L2 and L3 cache shape info Retrieved from device-tree when available Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/cache.h | 2 ++ arch/powerpc/kernel/setup_64.c | 26 +++++++++++++++++++++----- 2 files changed, 23 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/asm/cache.h b/arch/powerpc/include/asm/cache.h index 823750f..d7cf60f 100644 --- a/arch/powerpc/include/asm/cache.h +++ b/arch/powerpc/include/asm/cache.h @@ -43,6 +43,8 @@ struct ppc_cache_info { struct ppc64_caches { struct ppc_cache_info l1d; struct ppc_cache_info l1i; + struct ppc_cache_info l2; + struct ppc_cache_info l3; }; extern struct ppc64_caches ppc64_caches; diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c index b87dcb2..db18f7b 100644 --- a/arch/powerpc/kernel/setup_64.c +++ b/arch/powerpc/kernel/setup_64.c @@ -472,22 +472,38 @@ static bool __init parse_cache_info(struct device_node *np, void __init initialize_cache_info(void) { - struct device_node *np; + struct device_node *cpu, *l2, *l3 = NULL; DBG(" -> initialize_cache_info()\n"); - np = of_find_node_by_type(NULL, "cpu"); + cpu = of_find_node_by_type(NULL, "cpu"); /* * We're assuming *all* of the CPUs have the same * d-cache and i-cache sizes... -Peter */ - if (np) { - if (!parse_cache_info(np, false, &ppc64_caches.l1d)) + if (cpu) { + if (!parse_cache_info(cpu, false, &ppc64_caches.l1d)) DBG("Argh, can't find dcache properties !\n"); - if (!parse_cache_info(np, true, &ppc64_caches.l1i)) + if (!parse_cache_info(cpu, true, &ppc64_caches.l1i)) DBG("Argh, can't find icache properties !\n"); + + /* + * Try to find the L2 and L3 if any. Assume they are + * unified and use the D-side properties. + */ + l2 = of_find_next_cache_node(cpu); + of_node_put(cpu); + if (l2) { + parse_cache_info(l2, false, &ppc64_caches.l2); + l3 = of_find_next_cache_node(l2); + of_node_put(l2); + } + if (l3) { + parse_cache_info(l3, false, &ppc64_caches.l3); + of_node_put(l3); + } } /* For use by binfmt_elf */ -- 2.7.4