aleph/lkl_linux
1
0
Fork 0
mirror of https://github.com/lkl/linux.git synced 2025-12-19 16:13:19 +09:00
Code Issues Packages Projects Releases Wiki Activity

drm/tegra: Implement correct DMA-BUF semantics

Browse Source 
DMA-BUF requires that each device that accesses a DMA-BUF attaches to it
separately. To do so the host1x_bo_pin() and host1x_bo_unpin() functions
need to be reimplemented so that they can return a mapping, which either
represents an attachment or a map of the driver's own GEM object.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2021-09-09 15:51:24 +02:00
parent 7a56783850
commit c6aeaf56f4
9 changed files with 272 additions and 292 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
include/linux/host1x.h
View File

@@ -7,6 +7,7 @@
#define __LINUX_HOST1X_H
#include <linux/device.h>
#include <linux/dma-direction.h>
#include <linux/types.h>
enum host1x_class {
@@ -82,12 +83,23 @@ struct host1x_client {
struct host1x_bo;
struct sg_table;
struct host1x_bo_mapping {
struct dma_buf_attachment *attach;
enum dma_data_direction direction;
struct host1x_bo *bo;
struct sg_table *sgt;
unsigned int chunks;
struct device *dev;
dma_addr_t phys;
size_t size;
};
struct host1x_bo_ops {
struct host1x_bo *(*get)(struct host1x_bo *bo);
void (*put)(struct host1x_bo *bo);
struct sg_table *(*pin)(struct device *dev, struct host1x_bo *bo,
dma_addr_t *phys);
void (*unpin)(struct device *dev, struct sg_table *sgt);
struct host1x_bo_mapping *(*pin)(struct device *dev, struct host1x_bo *bo,
enum dma_data_direction dir);
void (*unpin)(struct host1x_bo_mapping *map);
void *(*mmap)(struct host1x_bo *bo);
void (*munmap)(struct host1x_bo *bo, void *addr);
};
@@ -112,17 +124,15 @@ static inline void host1x_bo_put(struct host1x_bo *bo)
bo->ops->put(bo);
}
static inline struct sg_table *host1x_bo_pin(struct device *dev,
struct host1x_bo *bo,
dma_addr_t *phys)
static inline struct host1x_bo_mapping *host1x_bo_pin(struct device *dev, struct host1x_bo *bo,
enum dma_data_direction dir)
{
return bo->ops->pin(dev, bo, phys);
return bo->ops->pin(dev, bo, dir);
}
static inline void host1x_bo_unpin(struct device *dev, struct host1x_bo *bo,
struct sg_table *sgt)
static inline void host1x_bo_unpin(struct host1x_bo_mapping *map)
{
bo->ops->unpin(dev, sgt);
map->bo->ops->unpin(map);
}
static inline void *host1x_bo_mmap(struct host1x_bo *bo)