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Mon, 19 Aug 2024 15:08:20 -0700 From: Shanker Donthineni To: James Morse CC: Catalin Marinas , Shanker Donthineni , Rohit Mathew , , , , Vikram Sethi Subject: [PATCH] arm_mpam: Fix T241-MPAM-4 workaround Date: Mon, 19 Aug 2024 17:08:18 -0500 Message-ID: <20240819220818.201870-1-sdonthineni@nvidia.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF0000231D:EE_|MN2PR12MB4288:EE_ X-MS-Office365-Filtering-Correlation-Id: 56681b00-96d0-4cb0-e065-08dcc09b7b8b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?hvLsXZl5aUMg44FLvb2f+zfvc5T+yxAHaDFKV49QkCPwmnORA9pet04U3Ev+?= =?us-ascii?Q?tQFR81VnPnY8pRKgQh9RTDVSxJRdOAcYuwQ8Qx8s3Q+xMxOxJii/+IMjpCNM?= =?us-ascii?Q?Ybbv4qPVGag8d1jhwLbinPpM/XBNgaDjFdbC/or61sI77yhaYZSpy4+/u+1u?= =?us-ascii?Q?B2kM+MijEEET+sEejoTsaDF9+DZzVOxo6QbVUtJ2gHnQoHl+OWPy5JShLHo6?= =?us-ascii?Q?wxOZXd0MrFWU5iEk1EJOzZgmyYKT04zv4zFxeUoa7cnacis/RLmzb5mVcOl/?= =?us-ascii?Q?Y2sUuk8gRxnaRWBOJIMlUApBVcV/rvn0V7F2J6XeSmhZRSpNkFCLA7E3V1KE?= =?us-ascii?Q?VVRdPMDctPJZn6fMmgh0mrNdxF4wjAVDzH+wZq0m+idWYvbK6Sm0Qzs/B+ek?= =?us-ascii?Q?ge9sHDyKGCYPLPoSTFg1vABc1MA3Qso4eLYEBwbLUJEPEi+nwZC8V7jQRfQG?= =?us-ascii?Q?fNw6MMHNF9+YA1ATPR7aQgV2QP+joQAyeBuksYgxQYETRugkXBxmwtmD364F?= =?us-ascii?Q?tAfTt6tkdwAOMlyIN4KD2AIwjJr3axsRmFxUeDV80W/xtcMaDSHDaMm5ATrB?= =?us-ascii?Q?O4bmg6wvuvb/V922BdGT/r18LSPyJWl5WxHqA/qeAS8BPPVHT6ILDQsrWLu0?= =?us-ascii?Q?PYR2iPIyFyW5vGKdUnHwkDuBhvDGT+csFW+L18SVUoJca5V2tY4sBiDZzQLk?= =?us-ascii?Q?FsNHCrrLLxGDRg2nb026iLSasXgCDd6v+y+fFOWkDIXoVvhDqt7PdL8UOFVR?= =?us-ascii?Q?StWlPxRHmU8K/q6B1icJScTV6xPQZR6v63wEl5jfZ/59Kgzmls+myyqA1SWs?= =?us-ascii?Q?8jW8VX+d+9rdi5gqJ7MASTNugeYA0igGrFVN3vmokDxIjaJEOAeknJTrYBlQ?= =?us-ascii?Q?n3youU9Mmnol1t+CfQmc78sGV8RB8ZqWAvk4HtTCbC0TDDwbLF9Dog+kG8yc?= =?us-ascii?Q?+B1Ukoe/1tY8xpo4cHUMtUTKLQ/NTARUYWphac/qrIloQy/KaEjGGfwoemqp?= =?us-ascii?Q?DWzrUqxTAG03v7bJSwaFExdV44BrRJFeSo42id7k0clOkv6VFNxw7O7l628c?= =?us-ascii?Q?Qn52fislpw5qotZXjGRjwKwqvk4yxEOsIxQdN/UyDTn2Q9rvKO8On/Ucvqvk?= =?us-ascii?Q?pC9/2vMKFPRC+fuvZnkAFoRRuGVzWbtL4/YyI129YSrufm5HOZ3g45AZE1JP?= =?us-ascii?Q?IjBQWkKDa0Bsus5LhcXsieD+SwyMS9xYe1JzyiIKtwDEOm8ox/LnPChsGJ2u?= =?us-ascii?Q?1hr6JgyZJR3jO6Udo9sn7yB00R9igSkiIfnLhtAu4UvQZi3uHgZyHKb03A92?= =?us-ascii?Q?crAbSfxtV4lcCgmJSvcaIDdkvip54mywXxnwaLO/vfnp0fc+szyuvVwbT8Ub?= =?us-ascii?Q?4PFkQxK8A0EameY/f55wsPWVI32B7Oph4Sd2NItyw104DaiUikx+g8XUfQ2I?= =?us-ascii?Q?0Y7qVR/6EaJFPZaGAGq8yGZOo4zwlm9x?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(376014)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Aug 2024 22:08:40.4214 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 56681b00-96d0-4cb0-e065-08dcc09b7b8b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF0000231D.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4288 Content-Type: text/plain; charset="utf-8" The workaround for T241-MPAM-4 was applied incorrectly, leading to MBW_MIN being programmed with a zero value when the user specifies MBW_MAX is less than 5%. This patch ensures that MBW_MIN is programmed with a non-zero value, set to 1 to fix the T241-MPAM-4 as expected. Fixes: 13ff1b527e40 ("arm_mpam: Add workaround for T241-MPAM-4") Signed-off-by: Shanker Donthineni --- drivers/platform/arm64/mpam/mpam_devices.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/platform/arm64/mpam/mpam_devices.c b/drivers/platform/= arm64/mpam/mpam_devices.c index a802ca1c9f05..e49a27c02c66 100644 --- a/drivers/platform/arm64/mpam/mpam_devices.c +++ b/drivers/platform/arm64/mpam/mpam_devices.c @@ -2990,7 +2990,7 @@ static void mpam_extend_config(struct mpam_class *cla= ss, struct mpam_config *cfg } =20 if (mpam_has_quirk(T241_FORCE_MBW_MIN_TO_ONE, class) && - cfg->mbw_min =3D=3D 0) { + cfg->mbw_min <=3D min_hw_granule) { cfg->mbw_min =3D min_hw_granule + 1; mpam_set_feature(mpam_feat_mbw_min, cfg); } --=20 2.25.1