Commit-ID: 3849e91f571dcb48cf2c8143480c59137d44d6bc Gitweb: http://git.kernel.org/tip/3849e91f571dcb48cf2c8143480c59137d44d6bc Author: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx> AuthorDate: Wed, 4 Nov 2015 12:49:42 +0100 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Sat, 7 Nov 2015 10:37:51 +0100 x86/AMD: Fix last level cache topology for AMD Fam17h systems On AMD Fam17h systems, the last level cache is not resident in the northbridge. Therefore, we cannot assign cpu_llc_id to the same value as Node ID as we have been doing until now. We should rather look at the ApicID bits of the core to provide us the last level cache ID info. Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Huang Rui <ray.huang@xxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Jacob Shin <jacob.w.shin@xxxxxxxxx> Link: http://lkml.kernel.org/r/1446582899-9378-1-git-send-email-Aravind.Gopalakrishnan@xxxxxxx Signed-off-by: Borislav Petkov <bp@xxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- arch/x86/kernel/cpu/amd.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 4a70fc6..a8816b3 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -352,6 +352,7 @@ static void amd_detect_cmp(struct cpuinfo_x86 *c) #ifdef CONFIG_SMP unsigned bits; int cpu = smp_processor_id(); + unsigned int socket_id, core_complex_id; bits = c->x86_coreid_bits; /* Low order bits define the core id (index of core in socket) */ @@ -361,6 +362,18 @@ static void amd_detect_cmp(struct cpuinfo_x86 *c) /* use socket ID also for last level cache */ per_cpu(cpu_llc_id, cpu) = c->phys_proc_id; amd_get_topology(c); + + /* + * Fix percpu cpu_llc_id here as LLC topology is different + * for Fam17h systems. + */ + if (c->x86 != 0x17 || !cpuid_edx(0x80000006)) + return; + + socket_id = (c->apicid >> bits) - 1; + core_complex_id = (c->apicid & ((1 << bits) - 1)) >> 3; + + per_cpu(cpu_llc_id, cpu) = (socket_id << 3) | core_complex_id; #endif } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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