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Mon, 29 Jun 2026 20:37:56 -0700 From: Honglei Huang To: CC: Honglei Huang , Matthew Brost Subject: [PATCH v8 2/5] drm/gpusvm: embed struct drm_device into drm_gpusvm_pages Date: Tue, 30 Jun 2026 11:37:28 +0800 Message-ID: <20260630033731.362150-3-honghuan@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260630033731.362150-1-honghuan@amd.com> References: <20260630033731.362150-1-honghuan@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb09.amd.com (10.181.42.218) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF00012E66:EE_|CYYPR12MB9013:EE_ X-MS-Office365-Filtering-Correlation-Id: 3d579ec7-7a52-46dc-965d-08ded65900ca X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|36860700016|82310400026|23010399003|1800799024|376014|22082099003|18002099003|56012099006|11063799006; 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DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: yKnFSd7Nwgl3ZDDEQ2DUwQYant3KVyQKtRI7pstBLZ7OcK23IXVrMcGVXLj08GpylbhOYV4aBAnc1yaA2wnD0wbfph7jNu+vpkVGApN/birkVZV615XukTk+PCekJkevUBrM/WOY3Y8o/+zuyUXo9mdYhueKMI/pYJC+0esjR/PYV4V7p98m5pdrjKptlY6Iwww4YcX7Sk9ELOTz19uFF3rbo0J9NPUOCVvDuyQmH9DRKO+TeJhNgIEtc070ZzAknhIpLYP0Jk2UHVJhrrPFBPYs3VT9aTQG7kFER8HQsuGaULQEKJu/YDLaVNBhIlTAf9GKo0Xf8OI/cTRUApurct6m8U6vUCljiFfdES3uyER2GA1Cd/3DKVOiDWZZzvG1ewLi69kz36LumN7gE31pSVZ0fpYFiAnB97HR79+j4qaS17fDZHcaLYS3pcSjvsx7 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jun 2026 03:38:08.5563 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3d579ec7-7a52-46dc-965d-08ded65900ca 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF00012E66.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CYYPR12MB9013 X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" drm_gpusvm_pages is the layer that actually represents physical pages/mappings it owns the dma_addr array, the dma_iova_state... With the previous patch, so drm_gpusvm_pages is now strictly about physical pages and their DMA view. Since now the drm_gpusvm_pages instance is inherently bound to one specific drm_device, make that ownership explicit by giving drm_gpusvm_pages its own drm_device handle, and drive all DMA through it instead of through the gpusvm: - Add drm to struct drm_gpusvm_pages and route all DMA in drm_gpusvm_get_pages() / __drm_gpusvm_unmap_pages() through svm_pages->drm instead of gpusvm->drm. - Bind svm_pages->drm where the pages object is initialised (drm_gpusvm_range_alloc() and the xe userptr setup) and require it to be set on entry to drm_gpusvm_get_pages(); the dma device is immutable for the lifetime of the pages instance. A later patch introduces drm_gpusvm_init_pages() to centralise this. Suggested-by: Matthew Brost Reviewed-by: Matthew Brost Signed-off-by: Honglei Huang --- drivers/gpu/drm/drm_gpusvm.c | 30 ++++++++++++++++++++---------- drivers/gpu/drm/xe/xe_userptr.c | 2 ++ include/drm/drm_gpusvm.h | 2 ++ 3 files changed, 24 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/drm_gpusvm.c b/drivers/gpu/drm/drm_gpusvm.c index abdfdaaf5e2..604554e40f6 100644 --- a/drivers/gpu/drm/drm_gpusvm.c +++ b/drivers/gpu/drm/drm_gpusvm.c @@ -641,6 +641,7 @@ drm_gpusvm_range_alloc(struct drm_gpusvm *gpusvm, range->itree.last = ALIGN(fault_addr + 1, chunk_size) - 1; INIT_LIST_HEAD(&range->entry); range->pages.notifier_seq = LONG_MAX; + range->pages.drm = gpusvm->drm; range->flags.migrate_devmem = migrate_devmem ? 1 : 0; return range; @@ -1135,11 +1136,16 @@ static void __drm_gpusvm_unmap_pages(struct drm_gpusvm *gpusvm, unsigned long npages) { struct drm_pagemap *dpagemap = svm_pages->dpagemap; - struct device *dev = gpusvm->drm->dev; + struct device *dev; unsigned long i, j; lockdep_assert_held(&gpusvm->notifier_lock); + if (!svm_pages->drm) + return; + + dev = svm_pages->drm->dev; + if (svm_pages->flags.has_dma_mapping) { struct drm_gpusvm_pages_flags flags = { .__flags = svm_pages->flags.__flags, @@ -1421,6 +1427,9 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm, DMA_BIDIRECTIONAL; struct dma_iova_state *state = &svm_pages->state; + if (!svm_pages->drm) + return -EINVAL; + retry: if (time_after(jiffies, timeout)) return -EBUSY; @@ -1520,7 +1529,7 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm, pagemap = page_pgmap(page); dpagemap = drm_pagemap_page_to_dpagemap(page); - if (drm_WARN_ON(gpusvm->drm, !dpagemap)) { + if (drm_WARN_ON(svm_pages->drm, !dpagemap)) { /* * Raced. This is not supposed to happen * since hmm_range_fault() should've migrated @@ -1532,10 +1541,10 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm, } svm_pages->dma_addr[j] = dpagemap->ops->device_map(dpagemap, - gpusvm->drm->dev, + svm_pages->drm->dev, page, order, dma_dir); - if (dma_mapping_error(gpusvm->drm->dev, + if (dma_mapping_error(svm_pages->drm->dev, svm_pages->dma_addr[j].addr)) { err = -EFAULT; goto err_unmap; @@ -1555,11 +1564,11 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm, } if (!i) - dma_iova_try_alloc(gpusvm->drm->dev, state, + dma_iova_try_alloc(svm_pages->drm->dev, state, 0, npages * PAGE_SIZE); if (dma_use_iova(state)) { - err = dma_iova_link(gpusvm->drm->dev, state, + err = dma_iova_link(svm_pages->drm->dev, state, hmm_pfn_to_phys(pfns[i]), svm_pages->state_offset, PAGE_SIZE << order, @@ -1570,11 +1579,11 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm, addr = state->addr + svm_pages->state_offset; svm_pages->state_offset += PAGE_SIZE << order; } else { - addr = dma_map_page(gpusvm->drm->dev, + addr = dma_map_page(svm_pages->drm->dev, page, 0, PAGE_SIZE << order, dma_dir); - if (dma_mapping_error(gpusvm->drm->dev, addr)) { + if (dma_mapping_error(svm_pages->drm->dev, addr)) { err = -EFAULT; goto err_unmap; } @@ -1590,7 +1599,7 @@ int drm_gpusvm_get_pages(struct drm_gpusvm *gpusvm, } if (dma_use_iova(state)) { - err = dma_iova_sync(gpusvm->drm->dev, state, 0, + err = dma_iova_sync(svm_pages->drm->dev, state, 0, svm_pages->state_offset); if (err) goto err_unmap; @@ -1640,7 +1649,8 @@ int drm_gpusvm_range_get_pages(struct drm_gpusvm *gpusvm, struct drm_gpusvm_range *range, const struct drm_gpusvm_ctx *ctx) { - return drm_gpusvm_get_pages(gpusvm, &range->pages, gpusvm->mm, + return drm_gpusvm_get_pages(gpusvm, &range->pages, + gpusvm->mm, &range->notifier->notifier, drm_gpusvm_range_start(range), drm_gpusvm_range_end(range), ctx); diff --git a/drivers/gpu/drm/xe/xe_userptr.c b/drivers/gpu/drm/xe/xe_userptr.c index 6761005c0b9..1b540e62af6 100644 --- a/drivers/gpu/drm/xe/xe_userptr.c +++ b/drivers/gpu/drm/xe/xe_userptr.c @@ -390,6 +390,7 @@ int xe_userptr_setup(struct xe_userptr_vma *uvma, unsigned long start, unsigned long range) { struct xe_userptr *userptr = &uvma->userptr; + struct xe_vm *vm = xe_vma_vm(&uvma->vma); int err; INIT_LIST_HEAD(&userptr->invalidate_link); @@ -402,6 +403,7 @@ int xe_userptr_setup(struct xe_userptr_vma *uvma, unsigned long start, return err; userptr->pages.notifier_seq = LONG_MAX; + userptr->pages.drm = &vm->xe->drm; return 0; } diff --git a/include/drm/drm_gpusvm.h b/include/drm/drm_gpusvm.h index 251a7266a73..842353afb27 100644 --- a/include/drm/drm_gpusvm.h +++ b/include/drm/drm_gpusvm.h @@ -129,6 +129,7 @@ struct drm_gpusvm_pages_flags { /** * struct drm_gpusvm_pages - Structure representing a GPU SVM mapped pages * + * @drm: The DRM device that owns the dma mappings * @dma_addr: Device address array * @dpagemap: The struct drm_pagemap of the device pages we're dma-mapping. * Note this is assuming only one drm_pagemap per range is allowed. @@ -138,6 +139,7 @@ struct drm_gpusvm_pages_flags { * @flags: Flags for the range; see &struct drm_gpusvm_pages_flags */ struct drm_gpusvm_pages { + struct drm_device *drm; struct drm_pagemap_addr *dma_addr; struct drm_pagemap *dpagemap; struct dma_iova_state state; -- 2.34.1