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Lin" , Singo Chang , "Nancy Lin" , Shawn Sung , , Jeffrey Kardatzke Subject: [PATCH v3 03/11] drm/mediatek: Add secure buffer control flow to mtk_drm_gem Date: Sun, 24 Dec 2023 02:29:24 +0800 Message-ID: <20231223182932.27683-4-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20231223182932.27683-1-jason-jh.lin@mediatek.com> References: <20231223182932.27683-1-jason-jh.lin@mediatek.com> MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--7.977800-8.000000 X-TMASE-MatchedRID: XAa2d/45j8QXSulpnju2HwNJ3EDwuUClKx5ICGp/WtFLgo8+IIHbcJh8 90SylZrlwPiYYkBDBMe2fd29CPQsSyQVVteP90CtKaMQ6tw7oDJMkOX0UoduuUYvSDWdWaRhkmi 3zE7HIvnZoTly3PGW4OyVvSGEffbDb6wZx1ul0pzJ5W6OZe5hhS7te75+XjKBv8D7QPW2jo8ARd T81SrHjvetcOpa0TfdcBOyDww4NUgfE8yM4pjsD7j1D7wMfbaSxEHRux+uk8h+ICquNi0WJOo7G aNcNoz1fMq3T8hRzFHWGvKb+enT6vQ1ivOPqkd1ftwZ3X11IV0= X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--7.977800-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: 609317B4147BB04E5C647078290145FD627771F3495687EBCC1162BE35CEC3862000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231223_103941_278327_99A68E38 X-CRM114-Status: GOOD ( 15.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add secure buffer control flow to mtk_drm_gem. When user space takes DRM_MTK_GEM_CREATE_ENCRYPTED flag and size to create a mtk_drm_gem object, mtk_drm_gem will find a matched size dma buffer from secure dma-heap and bind it to mtk_drm_gem object. Signed-off-by: Jason-JH.Lin --- drivers/gpu/drm/mediatek/mtk_drm_gem.c | 85 +++++++++++++++++++++++++- drivers/gpu/drm/mediatek/mtk_drm_gem.h | 4 ++ 2 files changed, 88 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c index 30e347adcbe9..858f34a735f8 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c @@ -4,6 +4,8 @@ */ #include +#include +#include #include #include @@ -55,6 +57,81 @@ static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev, return mtk_gem_obj; } +struct mtk_drm_gem_obj *mtk_drm_gem_create_from_heap(struct drm_device *dev, + const char *heap, size_t size) +{ + struct mtk_drm_private *priv = dev->dev_private; + struct mtk_drm_gem_obj *mtk_gem; + struct drm_gem_object *obj; + struct dma_heap *dma_heap; + struct dma_buf *dma_buf; + struct dma_buf_attachment *attach; + struct sg_table *sgt; + struct iosys_map map = {}; + int ret; + + mtk_gem = mtk_drm_gem_init(dev, size); + if (IS_ERR(mtk_gem)) + return ERR_CAST(mtk_gem); + + obj = &mtk_gem->base; + + dma_heap = dma_heap_find(heap); + if (!dma_heap) { + DRM_ERROR("heap find fail\n"); + goto err_gem_free; + } + dma_buf = dma_heap_buffer_alloc(dma_heap, size, + O_RDWR | O_CLOEXEC, DMA_HEAP_VALID_HEAP_FLAGS); + if (IS_ERR(dma_buf)) { + DRM_ERROR("buffer alloc fail\n"); + dma_heap_put(dma_heap); + goto err_gem_free; + } + dma_heap_put(dma_heap); + + attach = dma_buf_attach(dma_buf, priv->dma_dev); + if (IS_ERR(attach)) { + DRM_ERROR("attach fail, return\n"); + dma_buf_put(dma_buf); + goto err_gem_free; + } + + sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); + if (IS_ERR(sgt)) { + DRM_ERROR("map failed, detach and return\n"); + dma_buf_detach(dma_buf, attach); + dma_buf_put(dma_buf); + goto err_gem_free; + } + obj->import_attach = attach; + mtk_gem->dma_addr = sg_dma_address(sgt->sgl); + mtk_gem->sg = sgt; + mtk_gem->size = dma_buf->size; + + if (!strcmp(heap, "mtk_svp") || !strcmp(heap, "mtk_svp_cma")) { + /* secure buffer can not be mapped */ + mtk_gem->secure = true; + } else { + ret = dma_buf_vmap(dma_buf, &map); + mtk_gem->kvaddr = map.vaddr; + if (ret) { + DRM_ERROR("map failed, ret=%d\n", ret); + dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL); + dma_buf_detach(dma_buf, attach); + dma_buf_put(dma_buf); + mtk_gem->kvaddr = NULL; + } + } + + return mtk_gem; + +err_gem_free: + drm_gem_object_release(obj); + kfree(mtk_gem); + return ERR_PTR(-ENOMEM); +} + struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, size_t size, bool alloc_kmap) { @@ -225,7 +302,9 @@ struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev, if (IS_ERR(mtk_gem)) return ERR_CAST(mtk_gem); + mtk_gem->secure = !sg_page(sg->sgl); mtk_gem->dma_addr = sg_dma_address(sg->sgl); + mtk_gem->size = attach->dmabuf->size; mtk_gem->sg = sg; return &mtk_gem->base; @@ -301,7 +380,11 @@ int mtk_gem_create_ioctl(struct drm_device *dev, void *data, struct drm_mtk_gem_create *args = data; int ret; - mtk_gem = mtk_drm_gem_create(dev, args->size, false); + if (args->flags & DRM_MTK_GEM_CREATE_ENCRYPTED) + mtk_gem = mtk_drm_gem_create_from_heap(dev, "mtk_svp_cma", args->size); + else + mtk_gem = mtk_drm_gem_create(dev, args->size, false); + if (IS_ERR(mtk_gem)) return PTR_ERR(mtk_gem); diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h b/drivers/gpu/drm/mediatek/mtk_drm_gem.h index 90f3d2916ec5..8fd5ce827d4f 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h @@ -27,9 +27,11 @@ struct mtk_drm_gem_obj { void *cookie; void *kvaddr; dma_addr_t dma_addr; + size_t size; unsigned long dma_attrs; struct sg_table *sg; struct page **pages; + bool secure; }; #define to_mtk_gem_obj(x) container_of(x, struct mtk_drm_gem_obj, base) @@ -37,6 +39,8 @@ struct mtk_drm_gem_obj { void mtk_drm_gem_free_object(struct drm_gem_object *gem); struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, size_t size, bool alloc_kmap); +struct mtk_drm_gem_obj *mtk_drm_gem_create_from_heap(struct drm_device *dev, + const char *heap, size_t size); int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev, struct drm_mode_create_dumb *args); struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);