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Message-ID: <fa495623-1b63-4b94-84b8-c5cf0b9ba0ae@collabora.com>
Date: Tue, 24 Oct 2023 10:37:44 +0200
From: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>
To: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc: Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
linaro-mm-sig@...ts.linaro.org,
Jason-ch Chen <jason-ch.chen@...iatek.com>,
Johnson Wang <johnson.wang@...iatek.com>,
Singo Chang <singo.chang@...iatek.com>,
Nancy Lin <nancy.lin@...iatek.com>,
Shawn Sung <shawn.sung@...iatek.com>,
Project_Global_Chrome_Upstream_Group@...iatek.com,
Jeffrey Kardatzke <jkardatzke@...gle.com>
Subject: Re: [PATCH v2 03/11] drm/mediatek: Add secure buffer control flow to
mtk_drm_gem
Il 23/10/23 06:45, Jason-JH.Lin ha scritto:
> 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 <jason-jh.lin@...iatek.com>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_gem.c | 84 +++++++++++++++++++++++++-
> drivers/gpu/drm/mediatek/mtk_drm_gem.h | 4 ++
> 2 files changed, 87 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> index bcce723f257d..2064ccd7dde0 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> @@ -4,6 +4,8 @@
> */
>
> #include <linux/dma-buf.h>
> +#include <linux/dma-heap.h>
> +#include <uapi/linux/dma-heap.h>
> #include <drm/mediatek_drm.h>
>
> #include <drm/drm.h>
> @@ -55,6 +57,80 @@ 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;
> + }
blank line here please
> + 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->sec = 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)
> {
> @@ -218,7 +294,9 @@ 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->sec = !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;
> @@ -290,7 +368,11 @@ 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..ed4d23e252e9 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 sec;
`sec` may be ambiguous. You can call that `secure` or `is_secure_buf`.
> };
>
> #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);
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