From: Marek Szyprowski <m.szyprowski@samsung.com>
To: dri-devel@lists.freedesktop.org,
iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org,
linux-kernel@vger.kernel.org
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
David Airlie <airlied@linux.ie>,
Jonathan Hunter <jonathanh@nvidia.com>,
Thierry Reding <thierry.reding@gmail.com>,
linux-tegra@vger.kernel.org, Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
linux-arm-kernel@lists.infradead.org,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: [PATCH v4 23/38] drm: tegra: fix common struct sg_table related issues
Date: Tue, 12 May 2020 11:00:43 +0200 [thread overview]
Message-ID: <20200512090058.14910-23-m.szyprowski@samsung.com> (raw)
In-Reply-To: <20200512090058.14910-1-m.szyprowski@samsung.com>
The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function
returns the number of the created entries in the DMA address space.
However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and
dma_unmap_sg must be called with the original number of the entries
passed to the dma_map_sg().
struct sg_table is a common structure used for describing a non-contiguous
memory buffer, used commonly in the DRM and graphics subsystems. It
consists of a scatterlist with memory pages and DMA addresses (sgl entry),
as well as the number of scatterlist entries: CPU pages (orig_nents entry)
and DMA mapped pages (nents entry).
It turned out that it was a common mistake to misuse nents and orig_nents
entries, calling DMA-mapping functions with a wrong number of entries or
ignoring the number of mapped entries returned by the dma_map_sg()
function.
To avoid such issues, lets use a common dma-mapping wrappers operating
directly on the struct sg_table objects and use scatterlist page
iterators where possible. This, almost always, hides references to the
nents and orig_nents entries, making the code robust, easier to follow
and copy/paste safe.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
For more information, see '[PATCH v4 00/38] DRM: fix struct sg_table nents
vs. orig_nents misuse' thread:
https://lore.kernel.org/dri-devel/20200512085710.14688-1-m.szyprowski@samsung.com/T/
---
drivers/gpu/drm/tegra/gem.c | 27 ++++++++++-----------------
drivers/gpu/drm/tegra/plane.c | 15 +++++----------
2 files changed, 15 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 6237681..2169130 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -98,8 +98,8 @@ static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
* the SG table needs to be copied to avoid overwriting any
* other potential users of the original SG table.
*/
- err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, obj->sgt->nents,
- GFP_KERNEL);
+ err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl,
+ obj->sgt->orig_nents, GFP_KERNEL);
if (err < 0)
goto free;
} else {
@@ -196,8 +196,7 @@ static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
bo->iova = bo->mm->start;
- bo->size = iommu_map_sg(tegra->domain, bo->iova, bo->sgt->sgl,
- bo->sgt->nents, prot);
+ bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot);
if (!bo->size) {
dev_err(tegra->drm->dev, "failed to map buffer\n");
err = -ENOMEM;
@@ -264,8 +263,7 @@ static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
{
if (bo->pages) {
- dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
- DMA_FROM_DEVICE);
+ dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
drm_gem_put_pages(&bo->gem, bo->pages, true, true);
sg_free_table(bo->sgt);
kfree(bo->sgt);
@@ -290,12 +288,9 @@ static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
goto put_pages;
}
- err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
- DMA_FROM_DEVICE);
- if (err == 0) {
- err = -EFAULT;
+ err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0);
+ if (err)
goto free_sgt;
- }
return 0;
@@ -571,7 +566,7 @@ int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
goto free;
}
- if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
+ if (dma_map_sgtable(attach->dev, sgt, dir, 0))
goto free;
return sgt;
@@ -590,7 +585,7 @@ static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
struct tegra_bo *bo = to_tegra_bo(gem);
if (bo->pages)
- dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
+ dma_unmap_sgtable(attach->dev, sgt, dir, 0);
sg_free_table(sgt);
kfree(sgt);
@@ -609,8 +604,7 @@ static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
struct drm_device *drm = gem->dev;
if (bo->pages)
- dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
- DMA_FROM_DEVICE);
+ dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE);
return 0;
}
@@ -623,8 +617,7 @@ static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
struct drm_device *drm = gem->dev;
if (bo->pages)
- dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
- DMA_TO_DEVICE);
+ dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE);
return 0;
}
diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c
index 9ccfb56..0d2ef16 100644
--- a/drivers/gpu/drm/tegra/plane.c
+++ b/drivers/gpu/drm/tegra/plane.c
@@ -130,12 +130,9 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
}
if (sgt) {
- err = dma_map_sg(dc->dev, sgt->sgl, sgt->nents,
- DMA_TO_DEVICE);
- if (err == 0) {
- err = -ENOMEM;
+ err = dma_map_sgtable(dc->dev, sgt, DMA_TO_DEVICE, 0);
+ if (err)
goto unpin;
- }
/*
* The display controller needs contiguous memory, so
@@ -143,7 +140,7 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
* map its SG table to a single contiguous chunk of
* I/O virtual memory.
*/
- if (err > 1) {
+ if (sgt->nents > 1) {
err = -EINVAL;
goto unpin;
}
@@ -165,8 +162,7 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
struct sg_table *sgt = state->sgt[i];
if (sgt)
- dma_unmap_sg(dc->dev, sgt->sgl, sgt->nents,
- DMA_TO_DEVICE);
+ dma_unmap_sgtable(dc->dev, sgt, DMA_TO_DEVICE, 0);
host1x_bo_unpin(dc->dev, &bo->base, sgt);
state->iova[i] = DMA_MAPPING_ERROR;
@@ -185,8 +181,7 @@ static void tegra_dc_unpin(struct tegra_dc *dc, struct tegra_plane_state *state)
struct sg_table *sgt = state->sgt[i];
if (sgt)
- dma_unmap_sg(dc->dev, sgt->sgl, sgt->nents,
- DMA_TO_DEVICE);
+ dma_unmap_sgtable(dc->dev, sgt, DMA_TO_DEVICE, 0);
host1x_bo_unpin(dc->dev, &bo->base, sgt);
state->iova[i] = DMA_MAPPING_ERROR;
--
1.9.1
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next prev parent reply other threads:[~2020-05-12 9:02 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200512085722eucas1p2fbaab30e49c9ddadc64b27db856e5921@eucas1p2.samsung.com>
2020-05-12 8:57 ` [PATCH v4 00/38] DRM: fix struct sg_table nents vs. orig_nents misuse Marek Szyprowski
[not found] ` <CGME20200512090107eucas1p13a38ce5ce4c15cd0033acaea7b26c9b0@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 01/38] dma-mapping: add generic helpers for mapping sgtable objects Marek Szyprowski
[not found] ` <CGME20200512090108eucas1p10a3571be3f60265daea3b3f1469b5e82@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 02/38] scatterlist: add generic wrappers for iterating over " Marek Szyprowski
2020-05-13 13:24 ` Robin Murphy
[not found] ` <CGME20200512090108eucas1p2168167ab5e1de09df0d5def83f64dbfe@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 03/38] iommu: add generic helper for mapping " Marek Szyprowski
2020-05-13 9:03 ` Joerg Roedel
2020-05-13 13:27 ` Robin Murphy
[not found] ` <CGME20200512090109eucas1p285ca10dceb29f43aae1c40814e2dec8d@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 04/38] drm: prime: add common helper to check scatterlist contiguity Marek Szyprowski
[not found] ` <CGME20200512090110eucas1p1fdf69509f401e425c45e958430a99b65@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 05/38] drm: prime: use sgtable iterators in drm_prime_sg_to_page_addr_arrays() Marek Szyprowski
[not found] ` <CGME20200512090110eucas1p1b8de7671df480c071718c96f8ebdbc42@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 06/38] drm: core: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200512090111eucas1p2fd703addaa7975c16a1ea2d7807cc6a6@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 07/38] drm: amdgpu: " Marek Szyprowski
[not found] ` <CGME20200512090111eucas1p29897737c262b467437d0775204129105@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 08/38] drm: armada: " Marek Szyprowski
[not found] ` <CGME20200512090112eucas1p225de9f54f7fd54346043fc8c31e7ea2d@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 09/38] drm: etnaviv: " Marek Szyprowski
[not found] ` <CGME20200512090112eucas1p280707473d14730b8d3054fe9b0781a05@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 10/38] drm: exynos: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200512090113eucas1p254a8b23dd0ee63411df200f66d193203@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 11/38] drm: exynos: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200512090114eucas1p1917c16e0312cfb191f327e6dad2f7808@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 12/38] drm: i915: " Marek Szyprowski
[not found] ` <CGME20200512090114eucas1p1bc4ab112b490205283e7d2f82a9713ee@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 13/38] drm: lima: " Marek Szyprowski
[not found] ` <CGME20200512090115eucas1p25e71b29fa935e53e4c04f9b3789a09fc@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 14/38] drm: mediatek: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200512090116eucas1p2089d6eb7aa6bad4d2cbc2875c175873f@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 15/38] drm: mediatek: use common helper for extracting pages array Marek Szyprowski
[not found] ` <CGME20200512090116eucas1p24662e01574c0700cfe6d474280bb8df5@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 16/38] drm: msm: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200512090117eucas1p1acf4ddfe65242d28eee247ab2ca21454@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 17/38] drm: omapdrm: use common helper for extracting pages array Marek Szyprowski
[not found] ` <CGME20200512090117eucas1p1179ea62b61b45fae70630e66e434ffb3@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 18/38] drm: omapdrm: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200512090118eucas1p19ed5cf76c6e1e3f3bcaaefaeff7cf333@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 19/38] drm: panfrost: " Marek Szyprowski
[not found] ` <CGME20200512090119eucas1p2c0db485fddf17f15135f8e69e46fc097@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 20/38] drm: radeon: " Marek Szyprowski
[not found] ` <CGME20200512090119eucas1p2b3e1a858d8893f8d209d5c19fcbab941@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 21/38] drm: rockchip: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200512090120eucas1p28cc382480b2e3298b59fb6bf5ffde80b@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 22/38] drm: rockchip: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200512090120eucas1p18ae5489153837bbf5b8baa5089234c40@eucas1p1.samsung.com>
2020-05-12 9:00 ` Marek Szyprowski [this message]
[not found] ` <CGME20200512090121eucas1p2f20e300f70ff54da15fe49cc6690f608@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 24/38] drm: v3d: " Marek Szyprowski
[not found] ` <CGME20200512090122eucas1p10cc3f42cb0452a8a279fcc8702e50a7a@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 25/38] drm: virtio: " Marek Szyprowski
[not found] ` <CGME20200512090122eucas1p155db33deb51b4bbc34c0a012e4a7361d@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 26/38] drm: vmwgfx: " Marek Szyprowski
[not found] ` <CGME20200512090123eucas1p268736ef6e202c23e8be77c56873f415f@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 27/38] xen: gntdev: " Marek Szyprowski
[not found] ` <CGME20200512090123eucas1p25758ba07ba913e5a3eeca13c7f386fdb@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 28/38] drm: host1x: " Marek Szyprowski
[not found] ` <CGME20200512090124eucas1p1f96fac067834c139fe1095a63b4dc2f0@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 29/38] drm: rcar-du: " Marek Szyprowski
[not found] ` <CGME20200512090124eucas1p20509113bdbdd1070d8265aa1af80e64a@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 30/38] dmabuf: " Marek Szyprowski
[not found] ` <CGME20200512090125eucas1p1f9eae024a33e92bf1468f2af4e5a1b0a@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 31/38] staging: ion: remove dead code Marek Szyprowski
[not found] ` <CGME20200512090126eucas1p1ad8d5dfd09fce31d9a18691a76e9fa75@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 32/38] staging: ion: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200512090127eucas1p19889d83b1c750dcdc869323e8d1946a3@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 33/38] staging: tegra-vde: " Marek Szyprowski
[not found] ` <CGME20200512090128eucas1p2cf31bfdca3b096585ba9f2741ef08ce0@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 34/38] misc: fastrpc: " Marek Szyprowski
[not found] ` <CGME20200512090128eucas1p11ee8a5e72ca37dc6b3e8a07ea094bab6@eucas1p1.samsung.com>
2020-05-12 9:00 ` [PATCH v4 35/38] rapidio: " Marek Szyprowski
[not found] ` <CGME20200512090129eucas1p2e67c8a9adafb202970a59c3412cd887a@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 36/38] samples: vfio-mdev/mbochs: " Marek Szyprowski
[not found] ` <CGME20200512090129eucas1p24fa7e83acb8cde494f71ca5694279401@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 37/38] media: pci: fix common ALSA DMA-mapping related codes Marek Szyprowski
[not found] ` <CGME20200512090130eucas1p2eb86c5d34be56bbc81032bc0b6927d1e@eucas1p2.samsung.com>
2020-05-12 9:00 ` [PATCH v4 38/38] videobuf2: use sgtable-based scatterlist wrappers Marek Szyprowski
2020-05-12 17:52 ` Ruhl, Michael J
2020-05-12 20:33 ` Marek Szyprowski
2020-05-13 12:01 ` Ruhl, Michael J
[not found] ` <20200512121808.GA20393@lst.de>
2020-05-12 13:00 ` [PATCH v4 01/38] dma-mapping: add generic helpers for mapping sgtable objects Marek Szyprowski
[not found] ` <20200512130936.GA24428@lst.de>
2020-05-12 13:19 ` Marek Szyprowski
2020-05-13 13:23 ` Robin Murphy
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