From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3883A3D891D; Tue, 13 Oct 2026 12:24:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791894268; cv=none; b=i5GiT3RKHqnctmy2I6qEnh+hR/jgOonxYPATpZLPBJQ/mh85PyjdGghREvrdCpR/Q1yJyknfHhpwUm8MSHF6KbG9RfHY0jRhzNfXEPs/OCQUucxHhABinrDu4rPSFRK+IrHxx63RmF5Pvh31xk/T22O5tyQSCI5lP+ylizQgdLQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791894268; c=relaxed/simple; bh=24NZNJZEFmIjm89kuysLXju0SWtqy8/U6M4f9GeyVjs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=FD/fxr5aWPjytzjoBBPBei4BADvm46eQEeo8ClMSC7QoJZOqAiw7BUf6ElUiCl4p/QQ7p4vjIBPmpfBvyPMvR9BCAsRzA3SQ5X9sh1XD2m9J5KkAW3P+EojfHUyBtBAROKt1haYg9E/4hCUPPNU37ACpKhjvIFnMBa1b4q6rL7k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JQ6nSGd3; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JQ6nSGd3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80D761F000FF; Tue, 13 Oct 2026 12:24:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791894267; bh=TfhKZiUf8lYWC6c5anq3R5lh/gQnP3YWtXFLeYDfI+I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=JQ6nSGd3SdSulCXXXft+ov6t0M0X3b/cFkloLptBQ2Gcvz03WFXvorl7lqfKH1Cgw 0hIPfkD2ASbNPmN2mi0tVSAgEht5poHhgECCXnqEgswYfvo4PjHw8LzcOj5dMdGECO wWXSp3jwYdeb5NYzur6pmO31ZdxjCFytRH85pGgg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Christian=20K=C3=B6nig?= , Arunpravin Paneer Selvam , =?UTF-8?q?Timur=20Krist=C3=B3f?= , Alex Deucher , Sasha Levin Subject: [PATCH 6.18 503/621] drm/amdgpu: skip the VMID 0 flush for VRAM Date: Tue, 13 Oct 2026 13:38:18 +0200 Message-ID: <20261013112932.763832331@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261013112920.855194808@linuxfoundation.org> References: <20261013112920.855194808@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arunpravin Paneer Selvam [ Upstream commit 87ceb8cba73d0b3c4025ff42495bccd8164acaed ] Clear-on-release only runs on VRAM, which amdgpu_ttm_map_buffer() reaches via its direct MC address without programming a GART window, yet the wipe still forces a VMID 0 flush. On GFX11 (e.g. Navi33) that spurious SDMA flush can wedge the engine; only flush when a GART window is actually used. v2: Let amdgpu_ttm_map_buffer() return whether the VMID 0 flush is needed, and drive the clear and copy paths from that. (Christian) v3: Make the vm_needs_flush output parameter mandatory instead of allowing NULL. (Christian) Fixes: a68c7eaa7a8f ("drm/amdgpu: Enable clear page functionality") Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5413 Cc: Christian König Signed-off-by: Arunpravin Paneer Selvam Reviewed-by: Christian König Reviewed-by: Timur Kristóf Signed-off-by: Alex Deucher (cherry picked from commit a306e406e570b74318ff7d80e5b07b540ca1d3a9) Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index c48c266cc7a75..08c31d78b3fae 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -175,6 +175,8 @@ static void amdgpu_evict_flags(struct ttm_buffer_object *bo, * @tmz: if we should setup a TMZ enabled mapping * @size: in number of bytes to map, out number of bytes mapped * @addr: resulting address inside the MC address space + * @vm_needs_flush: out, set true if a GART window was programmed (VMID 0 flush + * needed) or false for a direct address * * Setup one of the GART windows to access a specific piece of memory or return * the physical address for local memory. @@ -183,7 +185,8 @@ static int amdgpu_ttm_map_buffer(struct ttm_buffer_object *bo, struct ttm_resource *mem, struct amdgpu_res_cursor *mm_cur, unsigned int window, struct amdgpu_ring *ring, - bool tmz, uint64_t *size, uint64_t *addr) + bool tmz, uint64_t *size, uint64_t *addr, + bool *vm_needs_flush) { struct amdgpu_device *adev = ring->adev; unsigned int offset, num_pages, num_dw, num_bytes; @@ -204,9 +207,12 @@ static int amdgpu_ttm_map_buffer(struct ttm_buffer_object *bo, if (!tmz && mem->start != AMDGPU_BO_INVALID_OFFSET) { *addr = amdgpu_ttm_domain_start(adev, mem->mem_type) + mm_cur->start; + *vm_needs_flush = false; return 0; } + /* A GART window is programmed below, so its VMID 0 TLB needs a flush */ + *vm_needs_flush = true; /* * If start begins at an offset inside the page, then adjust the size @@ -316,6 +322,7 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev, while (src_mm.remaining) { uint64_t from, to, cur_size, tiling_flags; uint32_t num_type, data_format, max_com, write_compress_disable; + bool src_vm_flush, dst_vm_flush; struct dma_fence *next; /* Never copy more than 256MiB at once to avoid a timeout */ @@ -323,12 +330,12 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev, /* Map src to window 0 and dst to window 1. */ r = amdgpu_ttm_map_buffer(src->bo, src->mem, &src_mm, - 0, ring, tmz, &cur_size, &from); + 0, ring, tmz, &cur_size, &from, &src_vm_flush); if (r) goto error; r = amdgpu_ttm_map_buffer(dst->bo, dst->mem, &dst_mm, - 1, ring, tmz, &cur_size, &to); + 1, ring, tmz, &cur_size, &to, &dst_vm_flush); if (r) goto error; @@ -356,7 +363,7 @@ int amdgpu_ttm_copy_mem_to_mem(struct amdgpu_device *adev, } r = amdgpu_copy_buffer(ring, from, to, cur_size, resv, - &next, false, true, copy_flags); + &next, false, src_vm_flush || dst_vm_flush, copy_flags); if (r) goto error; @@ -2419,6 +2426,7 @@ int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo, struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; struct amdgpu_res_cursor cursor; + bool vm_needs_flush = false; u64 addr; int r = 0; @@ -2446,12 +2454,12 @@ int amdgpu_ttm_clear_buffer(struct amdgpu_bo *bo, size = min(cursor.size, 256ULL << 20); r = amdgpu_ttm_map_buffer(&bo->tbo, bo->tbo.resource, &cursor, - 1, ring, false, &size, &addr); + 1, ring, false, &size, &addr, &vm_needs_flush); if (r) goto err; r = amdgpu_ttm_fill_mem(ring, 0, addr, size, resv, - &next, true, true, + &next, vm_needs_flush, true, AMDGPU_KERNEL_JOB_ID_TTM_CLEAR_BUFFER); if (r) goto err; @@ -2478,6 +2486,7 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo, struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring; struct dma_fence *fence = NULL; struct amdgpu_res_cursor dst; + bool vm_needs_flush = false; int r; if (!adev->mman.buffer_funcs_enabled) { @@ -2497,12 +2506,12 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo, cur_size = min(dst.size, 256ULL << 20); r = amdgpu_ttm_map_buffer(&bo->tbo, bo->tbo.resource, &dst, - 1, ring, false, &cur_size, &to); + 1, ring, false, &cur_size, &to, &vm_needs_flush); if (r) goto error; r = amdgpu_ttm_fill_mem(ring, src_data, to, cur_size, resv, - &next, true, delayed, k_job_id); + &next, vm_needs_flush, delayed, k_job_id); if (r) goto error; -- 2.53.0