Messages in this thread Patch in this message | | | From | James Morse <> | Subject | [PATCH v3 10/21] x86/resctrl: Abstract and use supports_mba_mbps() | Date | Thu, 17 Feb 2022 18:20:59 +0000 |
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To determine whether the mba_MBps option to resctrl should be supported, resctrl tests the boot CPUs' x86_vendor.
This isn't portable, and needs abstracting behind a helper so this check can be part of the filesystem code that moves to /fs/.
Re-use the tests set_mba_sc() does to determine if the mba_sc is supported on this system. An 'alloc_capable' test is added so that support for the controls isn't implied by the 'delay_linear' property, which is always true for MPAM.
Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com> Signed-off-by: James Morse <james.morse@arm.com> --- Changes since v1: * Capitalisation * Added MPAM example in commit message * Fixed supports_mba_mbps() logic error in rdt_parse_param() --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 22ebfdb4472d..7ec089d72ab7 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1922,11 +1922,21 @@ static void mba_sc_domain_destroy(struct rdt_resource *r, } /* - * Enable or disable the MBA software controller - * which helps user specify bandwidth in MBps. * MBA software controller is supported only if * MBM is supported and MBA is in linear scale. */ +static bool supports_mba_mbps(void) +{ + struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; + + return (is_mbm_enabled() && + r->alloc_capable && is_mba_linear()); +} + +/* + * Enable or disable the MBA software controller + * which helps user specify bandwidth in MBps. + */ static int set_mba_sc(bool mba_sc) { struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl; @@ -1934,8 +1944,7 @@ static int set_mba_sc(bool mba_sc) struct rdt_domain *d; int i; - if (!is_mbm_enabled() || !is_mba_linear() || - mba_sc == is_mba_sc(r)) + if (!supports_mba_mbps() || mba_sc == is_mba_sc(r)) return -EINVAL; r->membw.mba_sc = mba_sc; @@ -2295,7 +2304,7 @@ static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param) ctx->enable_cdpl2 = true; return 0; case Opt_mba_mbps: - if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) + if (!supports_mba_mbps()) return -EINVAL; ctx->enable_mba_mbps = true; return 0; -- 2.30.2
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