From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 6610024676A; Tue, 29 Apr 2025 23:53:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745970789; cv=none; b=s06P2wW8pYDioSNiDyZ77RhnVYzCJbrW02yNjjAFu9gCMznzrZmwkh1ue+VX2BjxTUcMbryfTZIZWP+Zq/uWxo1gheCelhNIE01nOhvnY9W11/MeqdtkLrp/jmF9wRrlnUrky+VrWV2r7jF3zBnVYdMqsYHDcomrmg1c+uCaUXc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745970789; c=relaxed/simple; bh=pZt2DPHAfask/sfLxdPOeDkn02Ro66UHuDGl1/Gb3Bc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=DgS3dDNFjK31R/IGcSGVX0TR2hwla01nuejsBOs8LNmCEGkpEUO9gUU3neCDFmhWErRhrPIxfFzUF6ExX7+bh2iiVsOy+aNlpM1+Ab8zwbZVEs+/wwfQjyePPV+FWT8QEfGusHE+Tv6/qBBxJPssNuHcmk6RzpY6xzhJbupCdgU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MgL95Hfz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MgL95Hfz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AB6B6C4CEF2; Tue, 29 Apr 2025 23:53:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1745970789; bh=pZt2DPHAfask/sfLxdPOeDkn02Ro66UHuDGl1/Gb3Bc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MgL95HfzIMz/STrMCTMwKpS9wSIR7hvwZJR3377RiF2ZebkzF57adGdGWf5TfPBF+ 3gApDA7jpxScmthCxMYaq01Y0DUDatsuv/ClbxQ3Rwr/JMQC1iOCy0N2TSAdfGcZwe jGezGdHZyFkgTdrdOSIzMe2IrXgYb2MTpV3vD8Kgj6OeHwkPm1to3wVVcJ+8AUlQW/ Jl3DOhG5G1j6ssikGtAiHdOFidlZijs+pSiBacjtneSK4dW1K50uFgapqcaZ23qYEL lQubGX3+/AkqsyA/agYCaWFXKIOeX+x06N3xLkeiNV+C3MyYA2fxU3paJooMi4vriK y2i62VadOJaGw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Felix Kuehling , Hao Zhou , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher , Sasha Levin , airlied@gmail.com, simona@ffwll.ch, Yunxiang.Li@amd.com, tvrtko.ursulin@igalia.com, matthew.auld@intel.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.6 18/21] drm/amdgpu: Allow P2P access through XGMI Date: Tue, 29 Apr 2025 19:52:30 -0400 Message-Id: <20250429235233.537828-18-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250429235233.537828-1-sashal@kernel.org> References: <20250429235233.537828-1-sashal@kernel.org> 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 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.88 Content-Transfer-Encoding: 8bit From: Felix Kuehling [ Upstream commit a92741e72f91b904c1d8c3d409ed8dbe9c1f2b26 ] If peer memory is accessible through XGMI, allow leaving it in VRAM rather than forcing its migration to GTT on DMABuf attachment. Signed-off-by: Felix Kuehling Tested-by: Hao (Claire) Zhou Reviewed-by: Christian König Signed-off-by: Alex Deucher (cherry picked from commit 372c8d72c3680fdea3fbb2d6b089f76b4a6d596a) Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 30 ++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c index be4cc4868a748..493e18bcea069 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c @@ -43,6 +43,29 @@ #include #include +static const struct dma_buf_attach_ops amdgpu_dma_buf_attach_ops; + +/** + * dma_buf_attach_adev - Helper to get adev of an attachment + * + * @attach: attachment + * + * Returns: + * A struct amdgpu_device * if the attaching device is an amdgpu device or + * partition, NULL otherwise. + */ +static struct amdgpu_device *dma_buf_attach_adev(struct dma_buf_attachment *attach) +{ + if (attach->importer_ops == &amdgpu_dma_buf_attach_ops) { + struct drm_gem_object *obj = attach->importer_priv; + struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); + + return amdgpu_ttm_adev(bo->tbo.bdev); + } + + return NULL; +} + /** * amdgpu_dma_buf_attach - &dma_buf_ops.attach implementation * @@ -54,12 +77,14 @@ static int amdgpu_dma_buf_attach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) { + struct amdgpu_device *attach_adev = dma_buf_attach_adev(attach); struct drm_gem_object *obj = dmabuf->priv; struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj); struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); int r; - if (pci_p2pdma_distance(adev->pdev, attach->dev, false) < 0) + if (!amdgpu_dmabuf_is_xgmi_accessible(attach_adev, bo) && + pci_p2pdma_distance(adev->pdev, attach->dev, false) < 0) attach->peer2peer = false; r = pm_runtime_get_sync(adev_to_drm(adev)->dev); @@ -482,6 +507,9 @@ bool amdgpu_dmabuf_is_xgmi_accessible(struct amdgpu_device *adev, struct drm_gem_object *obj = &bo->tbo.base; struct drm_gem_object *gobj; + if (!adev) + return false; + if (obj->import_attach) { struct dma_buf *dma_buf = obj->import_attach->dmabuf; -- 2.39.5