From nobody Thu Nov 28 04:42:10 2024 Received: from out-170.mta0.migadu.com (out-170.mta0.migadu.com [91.218.175.170]) (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 041701DFDB0 for ; Fri, 4 Oct 2024 19:42:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728070961; cv=none; b=WzojCzayVmUTbqVEwAzqtAjVGDolzy5sVDCRLUcV3+ZdYL+z3Jf14OxnnW6hfqEb28e8cHLIZ7oo0vVb3/02809+DsOBjgfH5frn5wSUUXxzEgcDyUWAyR5/xBzQZ2LyEYgql4MQ1N2cLcG1zGmZYHhuLbdEj+p92thWJHEJ8ZM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728070961; c=relaxed/simple; bh=LYsYnXoo3kJoUfPmbMgTjFyMWRRi33MCXZmR5eexX/g=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fBHIyDyW5KIT8dUGIuD7zPtM8vBmN2jRTzweDjwpJ7Sol/qS9eD7fFFMEDUkHI6ObrqJyW2Jm9oda9kFaWVi/M4cV++SFIqQA2UxVk96APv0hXFUIxuR2lZjzWy9Nv9AwxVehK1+N2fPqCdCzBkbXm5BaOHcMw6uJDUsqdVFT5A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ftNsIPXu; arc=none smtp.client-ip=91.218.175.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ftNsIPXu" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1728070956; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2EJrsyNwIp588IXKZBIiuIXp7P16IHtnrPh4MNvjTGI=; b=ftNsIPXu5yWFK5uGKVBVxFtlhQMVwwI0ePFe+xZi3HbLkOE17uCdKrM1oX6jrWkJ0uZmqW aZ97YrwoK0+6sp0lKOurPgC0n50nFt1cHRVbeIQ2qufLOpCNCQj9mX7f50q2BqtVJpPLbb id/P7nbCsaZred0PGd95KyMoBWyAFfA= From: Sui Jingfeng To: Lucas Stach , Russell King , Christian Gmeiner Cc: David Airlie , Simona Vetter , etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Sui Jingfeng Subject: [PATCH 2/3] drm/etnaviv: Map and unmap the GPU VA range with respect to its user size Date: Sat, 5 Oct 2024 03:42:06 +0800 Message-Id: <20241004194207.1013744-3-sui.jingfeng@linux.dev> In-Reply-To: <20241004194207.1013744-1-sui.jingfeng@linux.dev> References: <20241004194207.1013744-1-sui.jingfeng@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Since the GPU VA space is compact in terms of 4KiB unit, map and/or unmap the area that doesn't belong to a context breaks the philosophy of PPAS. That results in severe errors: GPU hang and MMU fault (page not present) and such. Shrink the usuable size of etnaviv GEM buffer object to its user size, instead of the original physical size of its backing memory. Signed-off-by: Sui Jingfeng --- drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 28 +++++++++------------------ 1 file changed, 9 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnavi= v/etnaviv_mmu.c index 6fbc62772d85..a52ec5eb0e3d 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -70,8 +70,10 @@ static int etnaviv_context_map(struct etnaviv_iommu_cont= ext *context, } =20 static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 io= va, + unsigned int user_len, struct sg_table *sgt, int prot) -{ struct scatterlist *sg; +{ + struct scatterlist *sg; unsigned int da =3D iova; unsigned int i; int ret; @@ -81,7 +83,8 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_context= *context, u32 iova, =20 for_each_sgtable_dma_sg(sgt, sg, i) { phys_addr_t pa =3D sg_dma_address(sg) - sg->offset; - size_t bytes =3D sg_dma_len(sg) + sg->offset; + unsigned int phys_len =3D sg_dma_len(sg) + sg->offset; + size_t bytes =3D MIN(phys_len, user_len); =20 VERB("map[%d]: %08x %pap(%zx)", i, iova, &pa, bytes); =20 @@ -89,6 +92,7 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_context= *context, u32 iova, if (ret) goto fail; =20 + user_len -=3D bytes; da +=3D bytes; } =20 @@ -104,21 +108,7 @@ static int etnaviv_iommu_map(struct etnaviv_iommu_cont= ext *context, u32 iova, static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32= iova, struct sg_table *sgt, unsigned len) { - struct scatterlist *sg; - unsigned int da =3D iova; - int i; - - for_each_sgtable_dma_sg(sgt, sg, i) { - size_t bytes =3D sg_dma_len(sg) + sg->offset; - - etnaviv_context_unmap(context, da, bytes); - - VERB("unmap[%d]: %08x(%zx)", i, iova, bytes); - - BUG_ON(!PAGE_ALIGNED(bytes)); - - da +=3D bytes; - } + etnaviv_context_unmap(context, iova, len); =20 context->flush_seq++; } @@ -131,7 +121,7 @@ static void etnaviv_iommu_remove_mapping(struct etnaviv= _iommu_context *context, lockdep_assert_held(&context->lock); =20 etnaviv_iommu_unmap(context, mapping->vram_node.start, - etnaviv_obj->sgt, etnaviv_obj->base.size); + etnaviv_obj->sgt, etnaviv_obj->user_size); drm_mm_remove_node(&mapping->vram_node); } =20 @@ -314,7 +304,7 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu_context = *context, goto unlock; =20 mapping->iova =3D node->start; - ret =3D etnaviv_iommu_map(context, node->start, sgt, + ret =3D etnaviv_iommu_map(context, node->start, user_size, sgt, ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE); =20 if (ret < 0) { --=20 2.34.1