Commit 71d7282a authored by Laurent Pinchart's avatar Laurent Pinchart

drm: GEM CMA: Add DRM PRIME support

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: default avatarRob Clark <robdclark@gmail.com>
parent ebaf9e03
...@@ -21,6 +21,7 @@ ...@@ -21,6 +21,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h> #include <linux/dma-mapping.h>
#include <drm/drmP.h> #include <drm/drmP.h>
...@@ -82,6 +83,8 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, ...@@ -82,6 +83,8 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
unsigned int size) unsigned int size)
{ {
struct drm_gem_cma_object *cma_obj; struct drm_gem_cma_object *cma_obj;
struct sg_table *sgt = NULL;
int ret;
size = round_up(size, PAGE_SIZE); size = round_up(size, PAGE_SIZE);
...@@ -94,11 +97,29 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, ...@@ -94,11 +97,29 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
if (!cma_obj->vaddr) { if (!cma_obj->vaddr) {
dev_err(drm->dev, "failed to allocate buffer with size %d\n", dev_err(drm->dev, "failed to allocate buffer with size %d\n",
size); size);
drm_gem_cma_free_object(&cma_obj->base); ret = -ENOMEM;
return ERR_PTR(-ENOMEM); goto error;
}
sgt = kzalloc(sizeof(*cma_obj->sgt), GFP_KERNEL);
if (sgt == NULL) {
ret = -ENOMEM;
goto error;
} }
ret = dma_get_sgtable(drm->dev, sgt, cma_obj->vaddr,
cma_obj->paddr, size);
if (ret < 0)
goto error;
cma_obj->sgt = sgt;
return cma_obj; return cma_obj;
error:
kfree(sgt);
drm_gem_cma_free_object(&cma_obj->base);
return ERR_PTR(ret);
} }
EXPORT_SYMBOL_GPL(drm_gem_cma_create); EXPORT_SYMBOL_GPL(drm_gem_cma_create);
...@@ -156,9 +177,16 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj) ...@@ -156,9 +177,16 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
cma_obj = to_drm_gem_cma_obj(gem_obj); cma_obj = to_drm_gem_cma_obj(gem_obj);
if (cma_obj->vaddr) if (cma_obj->vaddr) {
dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size, dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
cma_obj->vaddr, cma_obj->paddr); cma_obj->vaddr, cma_obj->paddr);
if (cma_obj->sgt) {
sg_free_table(cma_obj->sgt);
kfree(cma_obj->sgt);
}
} else if (gem_obj->import_attach) {
drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
}
drm_gem_object_release(gem_obj); drm_gem_object_release(gem_obj);
...@@ -291,3 +319,286 @@ void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m ...@@ -291,3 +319,286 @@ void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m
} }
EXPORT_SYMBOL_GPL(drm_gem_cma_describe); EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
#endif #endif
/* -----------------------------------------------------------------------------
* DMA-BUF
*/
struct drm_gem_cma_dmabuf_attachment {
struct sg_table sgt;
enum dma_data_direction dir;
};
static int drm_gem_cma_dmabuf_attach(struct dma_buf *dmabuf, struct device *dev,
struct dma_buf_attachment *attach)
{
struct drm_gem_cma_dmabuf_attachment *cma_attach;
cma_attach = kzalloc(sizeof(*cma_attach), GFP_KERNEL);
if (!cma_attach)
return -ENOMEM;
cma_attach->dir = DMA_NONE;
attach->priv = cma_attach;
return 0;
}
static void drm_gem_cma_dmabuf_detach(struct dma_buf *dmabuf,
struct dma_buf_attachment *attach)
{
struct drm_gem_cma_dmabuf_attachment *cma_attach = attach->priv;
struct sg_table *sgt;
if (cma_attach == NULL)
return;
sgt = &cma_attach->sgt;
if (cma_attach->dir != DMA_NONE)
dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
cma_attach->dir);
sg_free_table(sgt);
kfree(cma_attach);
attach->priv = NULL;
}
static struct sg_table *
drm_gem_cma_dmabuf_map(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
struct drm_gem_cma_dmabuf_attachment *cma_attach = attach->priv;
struct drm_gem_cma_object *cma_obj = attach->dmabuf->priv;
struct drm_device *drm = cma_obj->base.dev;
struct scatterlist *rd, *wr;
struct sg_table *sgt;
unsigned int i;
int nents, ret;
DRM_DEBUG_PRIME("\n");
if (WARN_ON(dir == DMA_NONE))
return ERR_PTR(-EINVAL);
/* Return the cached mapping when possible. */
if (cma_attach->dir == dir)
return &cma_attach->sgt;
/* Two mappings with different directions for the same attachment are
* not allowed.
*/
if (WARN_ON(cma_attach->dir != DMA_NONE))
return ERR_PTR(-EBUSY);
sgt = &cma_attach->sgt;
ret = sg_alloc_table(sgt, cma_obj->sgt->orig_nents, GFP_KERNEL);
if (ret) {
DRM_ERROR("failed to alloc sgt.\n");
return ERR_PTR(-ENOMEM);
}
mutex_lock(&drm->struct_mutex);
rd = cma_obj->sgt->sgl;
wr = sgt->sgl;
for (i = 0; i < sgt->orig_nents; ++i) {
sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
rd = sg_next(rd);
wr = sg_next(wr);
}
nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir);
if (!nents) {
DRM_ERROR("failed to map sgl with iommu.\n");
sg_free_table(sgt);
sgt = ERR_PTR(-EIO);
goto done;
}
cma_attach->dir = dir;
attach->priv = cma_attach;
DRM_DEBUG_PRIME("buffer size = %zu\n", cma_obj->base.size);
done:
mutex_unlock(&drm->struct_mutex);
return sgt;
}
static void drm_gem_cma_dmabuf_unmap(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
/* Nothing to do. */
}
static void drm_gem_cma_dmabuf_release(struct dma_buf *dmabuf)
{
struct drm_gem_cma_object *cma_obj = dmabuf->priv;
DRM_DEBUG_PRIME("%s\n", __FILE__);
/*
* drm_gem_cma_dmabuf_release() call means that file object's
* f_count is 0 and it calls drm_gem_object_handle_unreference()
* to drop the references that these values had been increased
* at drm_prime_handle_to_fd()
*/
if (cma_obj->base.export_dma_buf == dmabuf) {
cma_obj->base.export_dma_buf = NULL;
/*
* drop this gem object refcount to release allocated buffer
* and resources.
*/
drm_gem_object_unreference_unlocked(&cma_obj->base);
}
}
static void *drm_gem_cma_dmabuf_kmap_atomic(struct dma_buf *dmabuf,
unsigned long page_num)
{
/* TODO */
return NULL;
}
static void drm_gem_cma_dmabuf_kunmap_atomic(struct dma_buf *dmabuf,
unsigned long page_num, void *addr)
{
/* TODO */
}
static void *drm_gem_cma_dmabuf_kmap(struct dma_buf *dmabuf,
unsigned long page_num)
{
/* TODO */
return NULL;
}
static void drm_gem_cma_dmabuf_kunmap(struct dma_buf *dmabuf,
unsigned long page_num, void *addr)
{
/* TODO */
}
static int drm_gem_cma_dmabuf_mmap(struct dma_buf *dmabuf,
struct vm_area_struct *vma)
{
struct drm_gem_cma_object *cma_obj = dmabuf->priv;
struct drm_gem_object *gem_obj = &cma_obj->base;
int ret;
ret = drm_gem_mmap_obj(gem_obj, gem_obj->size, vma);
if (ret < 0)
return ret;
return drm_gem_cma_mmap_obj(cma_obj, vma);
}
static void *drm_gem_cma_dmabuf_vmap(struct dma_buf *dmabuf)
{
struct drm_gem_cma_object *cma_obj = dmabuf->priv;
return cma_obj->vaddr;
}
static struct dma_buf_ops drm_gem_cma_dmabuf_ops = {
.attach = drm_gem_cma_dmabuf_attach,
.detach = drm_gem_cma_dmabuf_detach,
.map_dma_buf = drm_gem_cma_dmabuf_map,
.unmap_dma_buf = drm_gem_cma_dmabuf_unmap,
.kmap = drm_gem_cma_dmabuf_kmap,
.kmap_atomic = drm_gem_cma_dmabuf_kmap_atomic,
.kunmap = drm_gem_cma_dmabuf_kunmap,
.kunmap_atomic = drm_gem_cma_dmabuf_kunmap_atomic,
.mmap = drm_gem_cma_dmabuf_mmap,
.vmap = drm_gem_cma_dmabuf_vmap,
.release = drm_gem_cma_dmabuf_release,
};
struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm,
struct drm_gem_object *obj, int flags)
{
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
return dma_buf_export(cma_obj, &drm_gem_cma_dmabuf_ops,
cma_obj->base.size, flags);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_export);
struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm,
struct dma_buf *dma_buf)
{
struct drm_gem_cma_object *cma_obj;
struct dma_buf_attachment *attach;
struct sg_table *sgt;
int ret;
DRM_DEBUG_PRIME("%s\n", __FILE__);
/* is this one of own objects? */
if (dma_buf->ops == &drm_gem_cma_dmabuf_ops) {
struct drm_gem_object *obj;
cma_obj = dma_buf->priv;
obj = &cma_obj->base;
/* is it from our device? */
if (obj->dev == drm) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_reference(obj);
dma_buf_put(dma_buf);
return obj;
}
}
/* Create a CMA GEM buffer. */
cma_obj = __drm_gem_cma_create(drm, dma_buf->size);
if (IS_ERR(cma_obj))
return ERR_PTR(PTR_ERR(cma_obj));
/* Attach to the buffer and map it. Make sure the mapping is contiguous
* on the device memory bus, as that's all we support.
*/
attach = dma_buf_attach(dma_buf, drm->dev);
if (IS_ERR(attach)) {
ret = -EINVAL;
goto error_gem_free;
}
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR_OR_NULL(sgt)) {
ret = sgt ? PTR_ERR(sgt) : -ENOMEM;
goto error_buf_detach;
}
if (sgt->nents != 1) {
ret = -EINVAL;
goto error_buf_unmap;
}
cma_obj->base.import_attach = attach;
cma_obj->paddr = sg_dma_address(sgt->sgl);
cma_obj->sgt = sgt;
DRM_DEBUG_PRIME("dma_addr = 0x%x, size = %zu\n", cma_obj->paddr,
dma_buf->size);
return &cma_obj->base;
error_buf_unmap:
dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
error_buf_detach:
dma_buf_detach(dma_buf, attach);
error_gem_free:
drm_gem_cma_free_object(&cma_obj->base);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dmabuf_import);
...@@ -4,6 +4,9 @@ ...@@ -4,6 +4,9 @@
struct drm_gem_cma_object { struct drm_gem_cma_object {
struct drm_gem_object base; struct drm_gem_object base;
dma_addr_t paddr; dma_addr_t paddr;
struct sg_table *sgt;
/* For objects with DMA memory allocated by GEM CMA */
void *vaddr; void *vaddr;
}; };
...@@ -45,4 +48,10 @@ extern const struct vm_operations_struct drm_gem_cma_vm_ops; ...@@ -45,4 +48,10 @@ extern const struct vm_operations_struct drm_gem_cma_vm_ops;
void drm_gem_cma_describe(struct drm_gem_cma_object *obj, struct seq_file *m); void drm_gem_cma_describe(struct drm_gem_cma_object *obj, struct seq_file *m);
#endif #endif
struct dma_buf *drm_gem_cma_dmabuf_export(struct drm_device *drm_dev,
struct drm_gem_object *obj,
int flags);
struct drm_gem_object *drm_gem_cma_dmabuf_import(struct drm_device *drm_dev,
struct dma_buf *dma_buf);
#endif /* __DRM_GEM_CMA_HELPER_H__ */ #endif /* __DRM_GEM_CMA_HELPER_H__ */
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