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path: root/drivers/gpu/drm/drm_gem_cma_helper.c
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Diffstat (limited to 'drivers/gpu/drm/drm_gem_cma_helper.c')
-rw-r--r--drivers/gpu/drm/drm_gem_cma_helper.c205
1 files changed, 165 insertions, 40 deletions
diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index 0a7e011509bd..ece72a8ac245 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/export.h>
+#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <drm/drmP.h>
@@ -32,11 +33,44 @@ static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj)
return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT;
}
-static void drm_gem_cma_buf_destroy(struct drm_device *drm,
- struct drm_gem_cma_object *cma_obj)
+/*
+ * __drm_gem_cma_create - Create a GEM CMA object without allocating memory
+ * @drm: The drm device
+ * @size: The GEM object size
+ *
+ * This function creates and initializes a GEM CMA object of the given size, but
+ * doesn't allocate any memory to back the object.
+ *
+ * Return a struct drm_gem_cma_object* on success or ERR_PTR values on failure.
+ */
+static struct drm_gem_cma_object *
+__drm_gem_cma_create(struct drm_device *drm, unsigned int size)
{
- dma_free_writecombine(drm->dev, cma_obj->base.size, cma_obj->vaddr,
- cma_obj->paddr);
+ struct drm_gem_cma_object *cma_obj;
+ struct drm_gem_object *gem_obj;
+ int ret;
+
+ cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
+ if (!cma_obj)
+ return ERR_PTR(-ENOMEM);
+
+ gem_obj = &cma_obj->base;
+
+ ret = drm_gem_object_init(drm, gem_obj, size);
+ if (ret)
+ goto error;
+
+ ret = drm_gem_create_mmap_offset(gem_obj);
+ if (ret) {
+ drm_gem_object_release(gem_obj);
+ goto error;
+ }
+
+ return cma_obj;
+
+error:
+ kfree(cma_obj);
+ return ERR_PTR(ret);
}
/*
@@ -49,44 +83,42 @@ struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
unsigned int size)
{
struct drm_gem_cma_object *cma_obj;
- struct drm_gem_object *gem_obj;
+ struct sg_table *sgt = NULL;
int ret;
size = round_up(size, PAGE_SIZE);
- cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
- if (!cma_obj)
- return ERR_PTR(-ENOMEM);
+ cma_obj = __drm_gem_cma_create(drm, size);
+ if (IS_ERR(cma_obj))
+ return cma_obj;
cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
&cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN);
if (!cma_obj->vaddr) {
- dev_err(drm->dev, "failed to allocate buffer with size %d\n", size);
+ dev_err(drm->dev, "failed to allocate buffer with size %d\n",
+ size);
ret = -ENOMEM;
- goto err_dma_alloc;
+ goto error;
}
- gem_obj = &cma_obj->base;
+ sgt = kzalloc(sizeof(*cma_obj->sgt), GFP_KERNEL);
+ if (sgt == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
- ret = drm_gem_object_init(drm, gem_obj, size);
- if (ret)
- goto err_obj_init;
+ ret = dma_get_sgtable(drm->dev, sgt, cma_obj->vaddr,
+ cma_obj->paddr, size);
+ if (ret < 0)
+ goto error;
- ret = drm_gem_create_mmap_offset(gem_obj);
- if (ret)
- goto err_create_mmap_offset;
+ cma_obj->sgt = sgt;
return cma_obj;
-err_create_mmap_offset:
- drm_gem_object_release(gem_obj);
-
-err_obj_init:
- drm_gem_cma_buf_destroy(drm, cma_obj);
-
-err_dma_alloc:
- kfree(cma_obj);
-
+error:
+ kfree(sgt);
+ drm_gem_cma_free_object(&cma_obj->base);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_create);
@@ -143,11 +175,20 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
if (gem_obj->map_list.map)
drm_gem_free_mmap_offset(gem_obj);
- drm_gem_object_release(gem_obj);
-
cma_obj = to_drm_gem_cma_obj(gem_obj);
- drm_gem_cma_buf_destroy(gem_obj->dev, cma_obj);
+ if (cma_obj->vaddr) {
+ dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
+ 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);
kfree(cma_obj);
}
@@ -174,10 +215,7 @@ int drm_gem_cma_dumb_create(struct drm_file *file_priv,
cma_obj = drm_gem_cma_create_with_handle(file_priv, dev,
args->size, &args->handle);
- if (IS_ERR(cma_obj))
- return PTR_ERR(cma_obj);
-
- return 0;
+ return PTR_RET(cma_obj);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
@@ -215,13 +253,26 @@ const struct vm_operations_struct drm_gem_cma_vm_ops = {
};
EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);
+static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
+ struct vm_area_struct *vma)
+{
+ int ret;
+
+ ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT,
+ vma->vm_end - vma->vm_start, vma->vm_page_prot);
+ if (ret)
+ drm_gem_vm_close(vma);
+
+ return ret;
+}
+
/*
* drm_gem_cma_mmap - (struct file_operation)->mmap callback function
*/
int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
{
- struct drm_gem_object *gem_obj;
struct drm_gem_cma_object *cma_obj;
+ struct drm_gem_object *gem_obj;
int ret;
ret = drm_gem_mmap(filp, vma);
@@ -231,12 +282,7 @@ int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
gem_obj = vma->vm_private_data;
cma_obj = to_drm_gem_cma_obj(gem_obj);
- ret = remap_pfn_range(vma, vma->vm_start, cma_obj->paddr >> PAGE_SHIFT,
- vma->vm_end - vma->vm_start, vma->vm_page_prot);
- if (ret)
- drm_gem_vm_close(vma);
-
- return ret;
+ return drm_gem_cma_mmap_obj(cma_obj, vma);
}
EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
@@ -270,3 +316,82 @@ void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m
}
EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
#endif
+
+/* low-level interface prime helpers */
+struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
+ struct sg_table *sgt;
+ int ret;
+
+ sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return NULL;
+
+ ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
+ cma_obj->paddr, obj->size);
+ if (ret < 0)
+ goto out;
+
+ return sgt;
+
+out:
+ kfree(sgt);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
+
+struct drm_gem_object *
+drm_gem_cma_prime_import_sg_table(struct drm_device *dev, size_t size,
+ struct sg_table *sgt)
+{
+ struct drm_gem_cma_object *cma_obj;
+
+ if (sgt->nents != 1)
+ return ERR_PTR(-EINVAL);
+
+ /* Create a CMA GEM buffer. */
+ cma_obj = __drm_gem_cma_create(dev, size);
+ if (IS_ERR(cma_obj))
+ return ERR_PTR(PTR_ERR(cma_obj));
+
+ 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, size);
+
+ return &cma_obj->base;
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
+
+int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
+ struct vm_area_struct *vma)
+{
+ struct drm_gem_cma_object *cma_obj;
+ struct drm_device *dev = obj->dev;
+ int ret;
+
+ mutex_lock(&dev->struct_mutex);
+ ret = drm_gem_mmap_obj(obj, obj->size, vma);
+ mutex_unlock(&dev->struct_mutex);
+ if (ret < 0)
+ return ret;
+
+ cma_obj = to_drm_gem_cma_obj(obj);
+ return drm_gem_cma_mmap_obj(cma_obj, vma);
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
+
+void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
+{
+ struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
+
+ return cma_obj->vaddr;
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
+
+void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+ /* Nothing to do */
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);