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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Mar 2025 11:18:13.3765 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0f598815-ea9e-45c4-3e10-08dd67a0e78e X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DU6PEPF0000B622.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS1PR08MB7428 Content-Type: text/plain; charset="utf-8" As the FLUSH_MEM and FLUSH_PT commands are deprecated in GPUs from Mali-G720 onwards, this patch adds support for performing cache maintenance via the FLUSH_CACHES command in GPU_CONTROL, in place of FLUSH_MEM and FLUSH_PT based on PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH feature bit. Signed-off-by: Karunika Choo --- drivers/gpu/drm/panthor/panthor_hw.h | 6 +++++ drivers/gpu/drm/panthor/panthor_mmu.c | 35 +++++++++++++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/drivers/gpu/drm/panthor/panthor_hw.h b/drivers/gpu/drm/panthor= /panthor_hw.h index dfe0f86c5d76..4d67fdfe86f9 100644 --- a/drivers/gpu/drm/panthor/panthor_hw.h +++ b/drivers/gpu/drm/panthor/panthor_hw.h @@ -16,6 +16,12 @@ struct panthor_device; * New feature flags will be added with support for newer GPU architecture= s. */ enum panthor_hw_feature { + /** + * @PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH: Perform cache maintenance + * via GPU_CONTROL. + */ + PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH, + /** @PANTHOR_HW_FEATURES_END: Must be last. */ PANTHOR_HW_FEATURES_END }; diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/pantho= r/panthor_mmu.c index a0a79f19bdea..4ac8bf36177e 100644 --- a/drivers/gpu/drm/panthor/panthor_mmu.c +++ b/drivers/gpu/drm/panthor/panthor_mmu.c @@ -29,7 +29,9 @@ =20 #include "panthor_device.h" #include "panthor_gem.h" +#include "panthor_gpu.h" #include "panthor_heap.h" +#include "panthor_hw.h" #include "panthor_mmu.h" #include "panthor_regs.h" #include "panthor_sched.h" @@ -568,6 +570,35 @@ static void lock_region(struct panthor_device *ptdev, = u32 as_nr, write_cmd(ptdev, as_nr, AS_COMMAND_LOCK); } =20 +static int mmu_hw_do_flush_on_gpu_ctrl(struct panthor_device *ptdev, int a= s_nr, + u32 op) +{ + const u32 l2_flush_op =3D CACHE_CLEAN | CACHE_INV; + u32 lsc_flush_op =3D 0; + int ret; + + if (op =3D=3D AS_COMMAND_FLUSH_MEM) + lsc_flush_op =3D CACHE_CLEAN | CACHE_INV; + + ret =3D wait_ready(ptdev, as_nr); + if (ret) + return ret; + + ret =3D panthor_gpu_flush_caches(ptdev, l2_flush_op, lsc_flush_op, 0); + if (ret) + return ret; + + /* + * Explicitly unlock the region as the AS is not unlocked automatically + * at the end of the GPU_CONTROL cache flush command, unlike + * AS_COMMAND_FLUSH_MEM or AS_COMMAND_FLUSH_PT. + */ + write_cmd(ptdev, as_nr, AS_COMMAND_UNLOCK); + + /* Wait for the unlock command to complete */ + return wait_ready(ptdev, as_nr); +} + static int mmu_hw_do_operation_locked(struct panthor_device *ptdev, int as= _nr, u64 iova, u64 size, u32 op) { @@ -585,6 +616,10 @@ static int mmu_hw_do_operation_locked(struct panthor_d= evice *ptdev, int as_nr, if (op !=3D AS_COMMAND_UNLOCK) lock_region(ptdev, as_nr, iova, size); =20 + if (panthor_hw_supports(ptdev,PANTHOR_HW_FEATURE_GPU_CTRL_CACHE_FLUSH)) + if (op =3D=3D AS_COMMAND_FLUSH_MEM || op =3D=3D AS_COMMAND_FLUSH_PT) + return mmu_hw_do_flush_on_gpu_ctrl(ptdev, as_nr, op); + /* Run the MMU operation */ write_cmd(ptdev, as_nr, op); =20 --=20 2.47.1