From: Borislav Petkov <bp@alien8.de>
To: Fenghua Yu <fenghua.yu@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, H Peter Anvin <hpa@zytor.com>,
Christopherson Sean J <sean.j.christopherson@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Radim Krcmar <rkrcmar@redhat.com>,
Ravi V Shankar <ravi.v.shankar@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH 1/3] x86/resctrl: Get max rmid and occupancy scale directly from CPUID instead of cpuinfo_x86
Date: Sun, 16 Jun 2019 19:52:33 +0200 [thread overview]
Message-ID: <20190616175233.GA10821@zn.tnic> (raw)
In-Reply-To: <1560705250-211820-2-git-send-email-fenghua.yu@intel.com>
On Sun, Jun 16, 2019 at 10:14:08AM -0700, Fenghua Yu wrote:
> @@ -617,13 +617,20 @@ static void l3_mon_evt_init(struct rdt_resource *r)
> list_add_tail(&mbm_local_event.list, &r->evt_list);
> }
>
> -int rdt_get_mon_l3_config(struct rdt_resource *r)
> +int __init rdt_get_mon_l3_config(struct rdt_resource *r)
> {
> unsigned int cl_size = boot_cpu_data.x86_cache_size;
> + u32 eax, ebx, ecx, edx;
> int ret;
>
> - r->mon_scale = boot_cpu_data.x86_cache_occ_scale;
> - r->num_rmid = boot_cpu_data.x86_cache_max_rmid + 1;
> + /*
> + * At this point, CQM LLC and one of L3 occupancy, MBM total, and
> + * MBM local monitoring features must be supported. So sub-leaf
> + * (EAX=0xf, ECX=1) contains needed information for this resource.
> + */
> + cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx);
> + r->num_rmid = ecx + 1;
> + r->mon_scale = ebx;
>
> /*
> * A reasonable upper limit on the max threshold is the number
This is simpler than that:
https://lkml.kernel.org/r/20190614174959.GF198207@romley-ivt3.sc.intel.com
Why?
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2019-06-16 17:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-16 17:14 [PATCH 0/3] x86/cpufeatures: Re-arrange a few features and enumerate AVX512 BFLOAT16 intructions Fenghua Yu
2019-06-16 17:14 ` [PATCH 1/3] x86/resctrl: Get max rmid and occupancy scale directly from CPUID instead of cpuinfo_x86 Fenghua Yu
2019-06-16 17:52 ` Borislav Petkov [this message]
2019-06-17 3:28 ` Fenghua Yu
2019-06-16 20:24 ` Thomas Gleixner
2019-06-17 3:18 ` Fenghua Yu
2019-06-17 7:52 ` Borislav Petkov
2019-06-17 8:09 ` Fenghua Yu
2019-06-17 8:30 ` Borislav Petkov
2019-06-17 8:35 ` Fenghua Yu
2019-06-17 9:13 ` Borislav Petkov
2019-06-16 17:14 ` [PATCH 2/3] x86/cpufeatures: Combine word 11 and 12 into new scattered features word 11 Fenghua Yu
2019-06-16 17:14 ` [PATCH 3/3] x86/cpufeatures: Enumerate new AVX512 BFLOAT16 instructions Fenghua Yu
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