[PATCH v4, 12/22] media: mediatek: vcodec: add interface to allocate/free secure memory
Yunfei Dong
yunfei.dong at mediatek.com
Mon Jan 29 06:30:15 UTC 2024
Need to call dma heap interface to allocate/free secure memory when playing
secure video.
Signed-off-by: Yunfei Dong <yunfei.dong at mediatek.com>
---
.../media/platform/mediatek/vcodec/Kconfig | 1 +
.../mediatek/vcodec/common/mtk_vcodec_util.c | 122 +++++++++++++++++-
.../mediatek/vcodec/common/mtk_vcodec_util.h | 3 +
3 files changed, 123 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/mediatek/vcodec/Kconfig b/drivers/media/platform/mediatek/vcodec/Kconfig
index bc8292232530..707865703e61 100644
--- a/drivers/media/platform/mediatek/vcodec/Kconfig
+++ b/drivers/media/platform/mediatek/vcodec/Kconfig
@@ -17,6 +17,7 @@ config VIDEO_MEDIATEK_VCODEC
depends on VIDEO_MEDIATEK_VPU || !VIDEO_MEDIATEK_VPU
depends on MTK_SCP || !MTK_SCP
depends on MTK_SMI || (COMPILE_TEST && MTK_SMI=n)
+ depends on DMABUF_HEAPS
select VIDEOBUF2_DMA_CONTIG
select V4L2_MEM2MEM_DEV
select VIDEO_MEDIATEK_VCODEC_VPU if VIDEO_MEDIATEK_VPU
diff --git a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.c b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.c
index 9ce34a3b5ee6..5cb7c347322b 100644
--- a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.c
+++ b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.c
@@ -5,9 +5,11 @@
* Tiffany Lin <tiffany.lin at mediatek.com>
*/
+#include <linux/dma-heap.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
+#include <uapi/linux/dma-heap.h>
#include "../decoder/mtk_vcodec_dec_drv.h"
#include "../encoder/mtk_vcodec_enc_drv.h"
@@ -45,7 +47,7 @@ int mtk_vcodec_write_vdecsys(struct mtk_vcodec_dec_ctx *ctx, unsigned int reg,
}
EXPORT_SYMBOL(mtk_vcodec_write_vdecsys);
-int mtk_vcodec_mem_alloc(void *priv, struct mtk_vcodec_mem *mem)
+static int mtk_vcodec_mem_alloc_nor(void *priv, struct mtk_vcodec_mem *mem)
{
enum mtk_instance_type inst_type = *((unsigned int *)priv);
struct platform_device *plat_dev;
@@ -76,9 +78,71 @@ int mtk_vcodec_mem_alloc(void *priv, struct mtk_vcodec_mem *mem)
return 0;
}
-EXPORT_SYMBOL(mtk_vcodec_mem_alloc);
-void mtk_vcodec_mem_free(void *priv, struct mtk_vcodec_mem *mem)
+static int mtk_vcodec_mem_alloc_sec(struct mtk_vcodec_dec_ctx *ctx, struct mtk_vcodec_mem *mem)
+{
+ struct device *dev = &ctx->dev->plat_dev->dev;
+ struct dma_buf *dma_buffer;
+ struct dma_heap *vdec_heap;
+ struct dma_buf_attachment *attach;
+ struct sg_table *sgt;
+ unsigned long size = mem->size;
+ int ret = 0;
+
+ if (!size)
+ return -EINVAL;
+
+ vdec_heap = dma_heap_find("restricted_mtk_cm");
+ if (!vdec_heap) {
+ mtk_v4l2_vdec_err(ctx, "dma heap find failed!");
+ return -EPERM;
+ }
+
+ dma_buffer = dma_heap_buffer_alloc(vdec_heap, size, DMA_HEAP_VALID_FD_FLAGS,
+ DMA_HEAP_VALID_HEAP_FLAGS);
+ if (IS_ERR_OR_NULL(dma_buffer)) {
+ mtk_v4l2_vdec_err(ctx, "dma heap alloc size=0x%lx failed!", size);
+ return PTR_ERR(dma_buffer);
+ }
+
+ attach = dma_buf_attach(dma_buffer, dev);
+ if (IS_ERR_OR_NULL(attach)) {
+ mtk_v4l2_vdec_err(ctx, "dma attach size=0x%lx failed!", size);
+ ret = PTR_ERR(attach);
+ goto err_attach;
+ }
+
+ sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
+ if (IS_ERR_OR_NULL(sgt)) {
+ mtk_v4l2_vdec_err(ctx, "dma map attach size=0x%lx failed!", size);
+ ret = PTR_ERR(sgt);
+ goto err_sgt;
+ }
+
+ mem->va = dma_buffer;
+ mem->dma_addr = (dma_addr_t)sg_dma_address((sgt)->sgl);
+
+ if (!mem->va || !mem->dma_addr) {
+ mtk_v4l2_vdec_err(ctx, "dma buffer size=0x%lx failed!", size);
+ ret = -EPERM;
+ goto err_addr;
+ }
+
+ mem->attach = attach;
+ mem->sgt = sgt;
+
+ return 0;
+err_addr:
+ dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
+err_sgt:
+ dma_buf_detach(dma_buffer, attach);
+err_attach:
+ dma_buf_put(dma_buffer);
+
+ return ret;
+}
+
+static void mtk_vcodec_mem_free_nor(void *priv, struct mtk_vcodec_mem *mem)
{
enum mtk_instance_type inst_type = *((unsigned int *)priv);
struct platform_device *plat_dev;
@@ -111,6 +175,57 @@ void mtk_vcodec_mem_free(void *priv, struct mtk_vcodec_mem *mem)
mem->dma_addr = 0;
mem->size = 0;
}
+
+static void mtk_vcodec_mem_free_sec(struct mtk_vcodec_mem *mem)
+{
+ if (mem->sgt)
+ dma_buf_unmap_attachment(mem->attach, mem->sgt, DMA_BIDIRECTIONAL);
+ dma_buf_detach((struct dma_buf *)mem->va, mem->attach);
+ dma_buf_put((struct dma_buf *)mem->va);
+
+ mem->attach = NULL;
+ mem->sgt = NULL;
+ mem->va = NULL;
+ mem->dma_addr = 0;
+ mem->size = 0;
+}
+
+int mtk_vcodec_mem_alloc(void *priv, struct mtk_vcodec_mem *mem)
+{
+ enum mtk_instance_type inst_type = *((unsigned int *)priv);
+ int ret;
+
+ if (inst_type == MTK_INST_DECODER) {
+ struct mtk_vcodec_dec_ctx *dec_ctx = priv;
+
+ if (dec_ctx->is_secure_playback) {
+ ret = mtk_vcodec_mem_alloc_sec(dec_ctx, mem);
+ goto alloc_end;
+ }
+ }
+
+ ret = mtk_vcodec_mem_alloc_nor(priv, mem);
+alloc_end:
+
+ return ret;
+}
+EXPORT_SYMBOL(mtk_vcodec_mem_alloc);
+
+void mtk_vcodec_mem_free(void *priv, struct mtk_vcodec_mem *mem)
+{
+ enum mtk_instance_type inst_type = *((unsigned int *)priv);
+
+ if (inst_type == MTK_INST_DECODER) {
+ struct mtk_vcodec_dec_ctx *dec_ctx = priv;
+
+ if (dec_ctx->is_secure_playback) {
+ mtk_vcodec_mem_free_sec(mem);
+ return;
+ }
+ }
+
+ mtk_vcodec_mem_free_nor(priv, mem);
+}
EXPORT_SYMBOL(mtk_vcodec_mem_free);
void *mtk_vcodec_get_hw_dev(struct mtk_vcodec_dec_dev *dev, int hw_idx)
@@ -172,3 +287,4 @@ EXPORT_SYMBOL(mtk_vcodec_get_curr_ctx);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Mediatek video codec driver");
+MODULE_IMPORT_NS(DMA_BUF);
diff --git a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.h b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.h
index 85f615cdd4d3..22078e757ed0 100644
--- a/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.h
+++ b/drivers/media/platform/mediatek/vcodec/common/mtk_vcodec_util.h
@@ -18,6 +18,9 @@ struct mtk_vcodec_mem {
size_t size;
void *va;
dma_addr_t dma_addr;
+
+ struct dma_buf_attachment *attach;
+ struct sg_table *sgt;
};
struct mtk_vcodec_fb {
--
2.18.0
More information about the dri-devel
mailing list