From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4B612C53213 for ; Fri, 24 Jul 2026 01:09:55 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9D52710F27C; Fri, 24 Jul 2026 01:09:54 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="QR5t+jvZ"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7432310E639 for ; Fri, 24 Jul 2026 01:09:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1784855393; x=1816391393; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=+9tN6ceUi93N1+vCD5cVqylsv8fmM5TUqJuya+Flylk=; b=QR5t+jvZ1jOOy1HYhZJOPnA57jzSnxe9pREwgWTx2AKqwFknija1km1j asVPqeq0sZ5I4aKHVaZuVl8t/zVbblhJQqm9fDEku4AeV/KiRxCqPL5+W BHZ155oedmp2rDnw/XMJfou1v8aFkAbljBV8ik+1I83r7CIqI/1cffZbI kMcDgY4XUYscFmHO3Uj5k7yaiSv/Y69rMguKAYukU7xsPXq8ffzg0DhOt BL1oVFPu3ILpaBI4VdDuVM+mBTt8F3NN+jSgE6MajDQzKIfFpsb/KNKDg SAYIDsnB1j3WD5f3DhAkdFkGCjwUslt7mLilo4i24+CsI2D2bHd1VKgo3 g==; X-CSE-ConnectionGUID: zn8D6UhCSXyzq+zF7lw2AA== X-CSE-MsgGUID: cYtL0sHjQ/WWCCTZoOmCUQ== X-IronPort-AV: E=McAfee;i="6800,10657,11854"; a="73064789" X-IronPort-AV: E=Sophos;i="6.25,181,1779174000"; d="scan'208";a="73064789" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jul 2026 18:09:52 -0700 X-CSE-ConnectionGUID: GrlMeJ9TTi6sAJznOhbngQ== X-CSE-MsgGUID: qS7ZT+36TqC3oOI8jENDnQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,181,1779174000"; d="scan'208";a="255929082" Received: from gsse-cloud1.jf.intel.com ([10.54.39.91]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jul 2026 18:09:52 -0700 From: Matthew Brost To: intel-xe@lists.freedesktop.org Subject: [PATCH v6 02/12] drm/xe: Allow prefetch-only VM bind IOCTLs to use VM read lock Date: Thu, 23 Jul 2026 18:09:37 -0700 Message-Id: <20260724010947.1573757-3-matthew.brost@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260724010947.1573757-1-matthew.brost@intel.com> References: <20260724010947.1573757-1-matthew.brost@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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" Prefetch-only VM bind IOCTLs do not modify VMAs after pinning userptr pages. Downgrade vm->lock to read mode once pinning is complete. Lays the groundwork for prefetch IOCTLs to use threaded migration. Signed-off-by: Matthew Brost --- drivers/gpu/drm/xe/xe_vm.c | 36 +++++++++++++++++++++++++++----- drivers/gpu/drm/xe/xe_vm_types.h | 2 ++ 2 files changed, 33 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c index 260a9c534aa4..555af2b57174 100644 --- a/drivers/gpu/drm/xe/xe_vm.c +++ b/drivers/gpu/drm/xe/xe_vm.c @@ -2449,10 +2449,12 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_vma_ops *vops, .map.gem.offset = bo_offset_or_userptr, }; + vops->flags |= XE_VMA_OPS_FLAG_MODIFIES_GPUVA; ops = drm_gpuvm_sm_map_ops_create(&vm->gpuvm, &map_req); break; } case DRM_XE_VM_BIND_OP_UNMAP: + vops->flags |= XE_VMA_OPS_FLAG_MODIFIES_GPUVA; ops = drm_gpuvm_sm_unmap_ops_create(&vm->gpuvm, addr, range); break; case DRM_XE_VM_BIND_OP_PREFETCH: @@ -2461,6 +2463,7 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_vma_ops *vops, case DRM_XE_VM_BIND_OP_UNMAP_ALL: xe_assert(vm->xe, bo); + vops->flags |= XE_VMA_OPS_FLAG_MODIFIES_GPUVA; err = xe_bo_lock(bo, true); if (err) return ERR_PTR(err); @@ -2511,6 +2514,9 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_vma_ops *vops, u8 id, tile_mask = 0; u32 i; + if (xe_vma_is_userptr(vma)) + vops->flags |= XE_VMA_OPS_FLAG_MODIFIES_GPUVA; + if (!xe_vma_is_cpu_addr_mirror(vma)) { op->prefetch.region = prefetch_region; continue; @@ -2699,10 +2705,12 @@ static int xe_vma_op_commit(struct xe_vm *vm, struct xe_vma_op *op) { int err = 0; - xe_vm_assert_write_mode_or_garbage_collector(vm); + lockdep_assert_held(&vm->lock); switch (op->base.op) { case DRM_GPUVA_OP_MAP: + xe_vm_assert_write_mode_or_garbage_collector(vm); + err |= xe_vm_insert_vma(vm, op->map.vma); if (!err) op->flags |= XE_VMA_OP_COMMITTED; @@ -2712,6 +2720,8 @@ static int xe_vma_op_commit(struct xe_vm *vm, struct xe_vma_op *op) u8 tile_present = gpuva_to_vma(op->base.remap.unmap->va)->tile_present; + xe_vm_assert_write_mode_or_garbage_collector(vm); + prep_vma_destroy(vm, gpuva_to_vma(op->base.remap.unmap->va), true); op->flags |= XE_VMA_OP_COMMITTED; @@ -2746,6 +2756,8 @@ static int xe_vma_op_commit(struct xe_vm *vm, struct xe_vma_op *op) break; } case DRM_GPUVA_OP_UNMAP: + xe_vm_assert_write_mode_or_garbage_collector(vm); + prep_vma_destroy(vm, gpuva_to_vma(op->base.unmap.va), true); op->flags |= XE_VMA_OP_COMMITTED; break; @@ -2970,10 +2982,12 @@ static void xe_vma_op_unwind(struct xe_vm *vm, struct xe_vma_op *op, bool post_commit, bool prev_post_commit, bool next_post_commit) { - xe_vm_assert_write_mode_or_garbage_collector(vm); + lockdep_assert_held(&vm->lock); switch (op->base.op) { case DRM_GPUVA_OP_MAP: + xe_vm_assert_write_mode_or_garbage_collector(vm); + if (op->map.vma) { prep_vma_destroy(vm, op->map.vma, post_commit); xe_vma_destroy_unlocked(op->map.vma); @@ -2983,6 +2997,8 @@ static void xe_vma_op_unwind(struct xe_vm *vm, struct xe_vma_op *op, { struct xe_vma *vma = gpuva_to_vma(op->base.unmap.va); + xe_vm_assert_write_mode_or_garbage_collector(vm); + if (vma) { xe_svm_notifier_lock(vm); vma->gpuva.flags &= ~XE_VMA_DESTROYED; @@ -2996,6 +3012,8 @@ static void xe_vma_op_unwind(struct xe_vm *vm, struct xe_vma_op *op, { struct xe_vma *vma = gpuva_to_vma(op->base.remap.unmap->va); + xe_vm_assert_write_mode_or_garbage_collector(vm); + if (op->remap.prev) { prep_vma_destroy(vm, op->remap.prev, prev_post_commit); xe_vma_destroy_unlocked(op->remap.prev); @@ -3580,7 +3598,7 @@ static struct dma_fence *vm_bind_ioctl_ops_execute(struct xe_vm *vm, struct dma_fence *fence; int err = 0; - lockdep_assert_held_write(&vm->lock); + lockdep_assert_held(&vm->lock); xe_validation_guard(&ctx, &vm->xe->val, &exec, ((struct xe_val_flags) { @@ -3903,7 +3921,7 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file) u32 num_syncs, num_ufence = 0; struct xe_sync_entry *syncs = NULL; struct drm_xe_vm_bind_op *bind_ops = NULL; - struct xe_vma_ops vops; + struct xe_vma_ops vops = { .flags = 0, }; struct dma_fence *fence; int err; int i; @@ -4078,6 +4096,11 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file) goto unwind_ops; } + if (!(vops.flags & XE_VMA_OPS_FLAG_MODIFIES_GPUVA)) { + vops.flags |= XE_VMA_OPS_FLAG_DOWNGRADE_LOCK; + downgrade_write(&vm->lock); + } + err = xe_vma_ops_alloc(&vops, args->num_binds > 1); if (err) goto unwind_ops; @@ -4114,7 +4137,10 @@ int xe_vm_bind_ioctl(struct drm_device *dev, void *data, struct drm_file *file) free_bos: kvfree(bos); release_vm_lock: - up_write(&vm->lock); + if (vops.flags & XE_VMA_OPS_FLAG_DOWNGRADE_LOCK) + up_read(&vm->lock); + else + up_write(&vm->lock); put_exec_queue: if (q) xe_exec_queue_put(q); diff --git a/drivers/gpu/drm/xe/xe_vm_types.h b/drivers/gpu/drm/xe/xe_vm_types.h index b94eb018d532..2f5f74fed9d2 100644 --- a/drivers/gpu/drm/xe/xe_vm_types.h +++ b/drivers/gpu/drm/xe/xe_vm_types.h @@ -561,6 +561,8 @@ struct xe_vma_ops { #define XE_VMA_OPS_ARRAY_OF_BINDS BIT(2) #define XE_VMA_OPS_FLAG_SKIP_TLB_WAIT BIT(3) #define XE_VMA_OPS_FLAG_ALLOW_SVM_UNMAP BIT(4) +#define XE_VMA_OPS_FLAG_MODIFIES_GPUVA BIT(5) +#define XE_VMA_OPS_FLAG_DOWNGRADE_LOCK BIT(6) u32 flags; #ifdef TEST_VM_OPS_ERROR /** @inject_error: inject error to test error handling */ -- 2.34.1