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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2023 00:57:29.8277 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c427b9f2-90ed-4fb5-fa54-08dbf2087e7d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000252A0.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4120 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The QOS Memory Bandwidth Enforcement Limit is reported by CPUID_Fn80000020_EAX_x01. Bits Description 31:0 BW_LEN: Size of the QOS Memory Bandwidth Enforcement Limit. Remove the hardcoded bandwidth limit value and detect using CPUID command. The CPUID details are documentation in the PPR listed below [1]. [1] Processor Programming Reference (PPR) Vol 1.1 for AMD Family 19h Model 11h B1 - 55901 Rev 0.25. Fixes: 4d05bf71f157 ("x86/resctrl: Introduce AMD QOS feature") Signed-off-by: Babu Moger Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D206537 --- arch/x86/kernel/cpu/resctrl/core.c | 2 +- arch/x86/kernel/cpu/resctrl/internal.h | 1 - 2 files changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index 19e0681f0435..3fbae10b662d 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -243,7 +243,7 @@ static bool __rdt_get_mem_config_amd(struct rdt_resourc= e *r) =20 cpuid_count(0x80000020, subleaf, &eax.full, &ebx, &ecx, &edx.full); hw_res->num_closid =3D edx.split.cos_max + 1; - r->default_ctrl =3D MAX_MBA_BW_AMD; + r->default_ctrl =3D 1 << eax.full; =20 /* AMD does not use delay */ r->membw.delay_linear =3D false; diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r= esctrl/internal.h index a4f1aa15f0a2..d2979748fae4 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -18,7 +18,6 @@ #define MBM_OVERFLOW_INTERVAL 1000 #define MAX_MBA_BW 100u #define MBA_IS_LINEAR 0x4 -#define MAX_MBA_BW_AMD 0x800 #define MBM_CNTR_WIDTH_OFFSET_AMD 20 =20 #define RMID_VAL_ERROR BIT_ULL(63) --=20 2.34.1