#include <drm/drm_vma_manager.h>
#include <linux/shmem_fs.h>
+#include <linux/dma-buf.h>
#include <drm/exynos_drm.h>
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
-#include "exynos_drm_buf.h"
#include "exynos_drm_iommu.h"
-static unsigned int convert_to_vm_err_msg(int msg)
+static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
{
- unsigned int out_msg;
+ struct drm_device *dev = exynos_gem->base.dev;
+ enum dma_attr attr;
+ unsigned int nr_pages;
+ struct sg_table sgt;
+ int ret = -ENOMEM;
+
+ if (exynos_gem->dma_addr) {
+ DRM_DEBUG_KMS("already allocated.\n");
+ return 0;
+ }
- switch (msg) {
- case 0:
- case -ERESTARTSYS:
- case -EINTR:
- out_msg = VM_FAULT_NOPAGE;
- break;
+ init_dma_attrs(&exynos_gem->dma_attrs);
- case -ENOMEM:
- out_msg = VM_FAULT_OOM;
- break;
+ /*
+ * if EXYNOS_BO_CONTIG, fully physically contiguous memory
+ * region will be allocated else physically contiguous
+ * as possible.
+ */
+ if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
+ dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs);
- default:
- out_msg = VM_FAULT_SIGBUS;
- break;
+ /*
+ * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
+ * else cachable mapping.
+ */
+ if (exynos_gem->flags & EXYNOS_BO_WC ||
+ !(exynos_gem->flags & EXYNOS_BO_CACHABLE))
+ attr = DMA_ATTR_WRITE_COMBINE;
+ else
+ attr = DMA_ATTR_NON_CONSISTENT;
+
+ dma_set_attr(attr, &exynos_gem->dma_attrs);
+ dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs);
+
+ nr_pages = exynos_gem->size >> PAGE_SHIFT;
+
+ exynos_gem->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
+ if (!exynos_gem->pages) {
+ DRM_ERROR("failed to allocate pages.\n");
+ return -ENOMEM;
}
- return out_msg;
-}
+ exynos_gem->cookie = dma_alloc_attrs(dev->dev, exynos_gem->size,
+ &exynos_gem->dma_addr, GFP_KERNEL,
+ &exynos_gem->dma_attrs);
+ if (!exynos_gem->cookie) {
+ DRM_ERROR("failed to allocate buffer.\n");
+ goto err_free;
+ }
-static int check_gem_flags(unsigned int flags)
-{
- if (flags & ~(EXYNOS_BO_MASK)) {
- DRM_ERROR("invalid flags.\n");
- return -EINVAL;
+ ret = dma_get_sgtable_attrs(dev->dev, &sgt, exynos_gem->cookie,
+ exynos_gem->dma_addr, exynos_gem->size,
+ &exynos_gem->dma_attrs);
+ if (ret < 0) {
+ DRM_ERROR("failed to get sgtable.\n");
+ goto err_dma_free;
}
- return 0;
-}
+ if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
+ nr_pages)) {
+ DRM_ERROR("invalid sgtable.\n");
+ ret = -EINVAL;
+ goto err_sgt_free;
+ }
-static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
- struct vm_area_struct *vma)
-{
- DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
+ sg_free_table(&sgt);
- /* non-cachable as default. */
- if (obj->flags & EXYNOS_BO_CACHABLE)
- vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
- else if (obj->flags & EXYNOS_BO_WC)
- vma->vm_page_prot =
- pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
- else
- vma->vm_page_prot =
- pgprot_noncached(vm_get_page_prot(vma->vm_flags));
-}
+ DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
+ (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
-static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
-{
- /* TODO */
+ return 0;
+
+err_sgt_free:
+ sg_free_table(&sgt);
+err_dma_free:
+ dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
+ exynos_gem->dma_addr, &exynos_gem->dma_attrs);
+err_free:
+ drm_free_large(exynos_gem->pages);
- return roundup(size, PAGE_SIZE);
+ return ret;
}
-static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
- struct vm_area_struct *vma,
- unsigned long f_vaddr,
- pgoff_t page_offset)
+static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
{
- struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
- struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
- struct scatterlist *sgl;
- unsigned long pfn;
- int i;
-
- if (!buf->sgt)
- return -EINTR;
+ struct drm_device *dev = exynos_gem->base.dev;
- if (page_offset >= (buf->size >> PAGE_SHIFT)) {
- DRM_ERROR("invalid page offset\n");
- return -EINVAL;
+ if (!exynos_gem->dma_addr) {
+ DRM_DEBUG_KMS("dma_addr is invalid.\n");
+ return;
}
- sgl = buf->sgt->sgl;
- for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
- if (page_offset < (sgl->length >> PAGE_SHIFT))
- break;
- page_offset -= (sgl->length >> PAGE_SHIFT);
- }
+ DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
+ (unsigned long)exynos_gem->dma_addr, exynos_gem->size);
- pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
+ dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie,
+ (dma_addr_t)exynos_gem->dma_addr,
+ &exynos_gem->dma_attrs);
- return vm_insert_mixed(vma, f_vaddr, pfn);
+ drm_free_large(exynos_gem->pages);
}
static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
return 0;
}
-void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
+void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
{
- struct drm_gem_object *obj;
- struct exynos_drm_gem_buf *buf;
-
- obj = &exynos_gem_obj->base;
- buf = exynos_gem_obj->buffer;
+ struct drm_gem_object *obj = &exynos_gem->base;
DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
* once dmabuf's refcount becomes 0.
*/
if (obj->import_attach)
- goto out;
-
- exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
-
-out:
- exynos_drm_fini_buf(obj->dev, buf);
- exynos_gem_obj->buffer = NULL;
-
- drm_gem_free_mmap_offset(obj);
+ drm_prime_gem_destroy(obj, exynos_gem->sgt);
+ else
+ exynos_drm_free_buf(exynos_gem);
/* release file pointer to gem object. */
drm_gem_object_release(obj);
- kfree(exynos_gem_obj);
- exynos_gem_obj = NULL;
+ kfree(exynos_gem);
}
unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
unsigned int gem_handle,
struct drm_file *file_priv)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
return 0;
}
- exynos_gem_obj = to_exynos_gem_obj(obj);
+ exynos_gem = to_exynos_gem(obj);
drm_gem_object_unreference_unlocked(obj);
- return exynos_gem_obj->buffer->size;
+ return exynos_gem->size;
}
-
-struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
- unsigned long size)
+static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
+ unsigned long size)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
int ret;
- exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
- if (!exynos_gem_obj)
- return NULL;
+ exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
+ if (!exynos_gem)
+ return ERR_PTR(-ENOMEM);
- exynos_gem_obj->size = size;
- obj = &exynos_gem_obj->base;
+ exynos_gem->size = size;
+ obj = &exynos_gem->base;
ret = drm_gem_object_init(dev, obj, size);
if (ret < 0) {
DRM_ERROR("failed to initialize gem object\n");
- kfree(exynos_gem_obj);
- return NULL;
+ kfree(exynos_gem);
+ return ERR_PTR(ret);
+ }
+
+ ret = drm_gem_create_mmap_offset(obj);
+ if (ret < 0) {
+ drm_gem_object_release(obj);
+ kfree(exynos_gem);
+ return ERR_PTR(ret);
}
DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
- return exynos_gem_obj;
+ return exynos_gem;
}
-struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
- unsigned int flags,
- unsigned long size)
+struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
+ unsigned int flags,
+ unsigned long size)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
- struct exynos_drm_gem_buf *buf;
+ struct exynos_drm_gem *exynos_gem;
int ret;
+ if (flags & ~(EXYNOS_BO_MASK)) {
+ DRM_ERROR("invalid flags.\n");
+ return ERR_PTR(-EINVAL);
+ }
+
if (!size) {
DRM_ERROR("invalid size.\n");
return ERR_PTR(-EINVAL);
}
- size = roundup_gem_size(size, flags);
-
- ret = check_gem_flags(flags);
- if (ret)
- return ERR_PTR(ret);
-
- buf = exynos_drm_init_buf(dev, size);
- if (!buf)
- return ERR_PTR(-ENOMEM);
-
- exynos_gem_obj = exynos_drm_gem_init(dev, size);
- if (!exynos_gem_obj) {
- ret = -ENOMEM;
- goto err_fini_buf;
- }
+ size = roundup(size, PAGE_SIZE);
- exynos_gem_obj->buffer = buf;
+ exynos_gem = exynos_drm_gem_init(dev, size);
+ if (IS_ERR(exynos_gem))
+ return exynos_gem;
/* set memory type and cache attribute from user side. */
- exynos_gem_obj->flags = flags;
-
- ret = exynos_drm_alloc_buf(dev, buf, flags);
- if (ret < 0)
- goto err_gem_fini;
+ exynos_gem->flags = flags;
- return exynos_gem_obj;
+ ret = exynos_drm_alloc_buf(exynos_gem);
+ if (ret < 0) {
+ drm_gem_object_release(&exynos_gem->base);
+ kfree(exynos_gem);
+ return ERR_PTR(ret);
+ }
-err_gem_fini:
- drm_gem_object_release(&exynos_gem_obj->base);
- kfree(exynos_gem_obj);
-err_fini_buf:
- exynos_drm_fini_buf(dev, buf);
- return ERR_PTR(ret);
+ return exynos_gem;
}
int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_exynos_gem_create *args = data;
- struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem *exynos_gem;
int ret;
- exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
- if (IS_ERR(exynos_gem_obj))
- return PTR_ERR(exynos_gem_obj);
+ exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
+ if (IS_ERR(exynos_gem))
+ return PTR_ERR(exynos_gem);
- ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
- &args->handle);
+ ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
+ &args->handle);
if (ret) {
- exynos_drm_gem_destroy(exynos_gem_obj);
+ exynos_drm_gem_destroy(exynos_gem);
return ret;
}
unsigned int gem_handle,
struct drm_file *filp)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
obj = drm_gem_object_lookup(dev, filp, gem_handle);
return ERR_PTR(-EINVAL);
}
- exynos_gem_obj = to_exynos_gem_obj(obj);
+ exynos_gem = to_exynos_gem(obj);
- return &exynos_gem_obj->buffer->dma_addr;
+ return &exynos_gem->dma_addr;
}
void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
drm_gem_object_unreference_unlocked(obj);
}
-int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
+static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
struct vm_area_struct *vma)
{
- struct drm_device *drm_dev = exynos_gem_obj->base.dev;
- struct exynos_drm_gem_buf *buffer;
+ struct drm_device *drm_dev = exynos_gem->base.dev;
unsigned long vm_size;
int ret;
vm_size = vma->vm_end - vma->vm_start;
- /*
- * a buffer contains information to physically continuous memory
- * allocated by user request or at framebuffer creation.
- */
- buffer = exynos_gem_obj->buffer;
-
/* check if user-requested size is valid. */
- if (vm_size > buffer->size)
+ if (vm_size > exynos_gem->size)
return -EINVAL;
- ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
- buffer->dma_addr, buffer->size,
- &buffer->dma_attrs);
+ ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem->pages,
+ exynos_gem->dma_addr, exynos_gem->size,
+ &exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;
int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
-{ struct exynos_drm_gem_obj *exynos_gem_obj;
+{
+ struct exynos_drm_gem *exynos_gem;
struct drm_exynos_gem_info *args = data;
struct drm_gem_object *obj;
return -EINVAL;
}
- exynos_gem_obj = to_exynos_gem_obj(obj);
+ exynos_gem = to_exynos_gem(obj);
- args->flags = exynos_gem_obj->flags;
- args->size = exynos_gem_obj->size;
+ args->flags = exynos_gem->flags;
+ args->size = exynos_gem->size;
drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
return 0;
}
-struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
-{
- struct vm_area_struct *vma_copy;
-
- vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
- if (!vma_copy)
- return NULL;
-
- if (vma->vm_ops && vma->vm_ops->open)
- vma->vm_ops->open(vma);
-
- if (vma->vm_file)
- get_file(vma->vm_file);
-
- memcpy(vma_copy, vma, sizeof(*vma));
-
- vma_copy->vm_mm = NULL;
- vma_copy->vm_next = NULL;
- vma_copy->vm_prev = NULL;
-
- return vma_copy;
-}
-
-void exynos_gem_put_vma(struct vm_area_struct *vma)
-{
- if (!vma)
- return;
-
- if (vma->vm_ops && vma->vm_ops->close)
- vma->vm_ops->close(vma);
-
- if (vma->vm_file)
- fput(vma->vm_file);
-
- kfree(vma);
-}
-
-int exynos_gem_get_pages_from_userptr(unsigned long start,
- unsigned int npages,
- struct page **pages,
- struct vm_area_struct *vma)
-{
- int get_npages;
-
- /* the memory region mmaped with VM_PFNMAP. */
- if (vma_is_io(vma)) {
- unsigned int i;
-
- for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
- unsigned long pfn;
- int ret = follow_pfn(vma, start, &pfn);
- if (ret)
- return ret;
-
- pages[i] = pfn_to_page(pfn);
- }
-
- if (i != npages) {
- DRM_ERROR("failed to get user_pages.\n");
- return -EINVAL;
- }
-
- return 0;
- }
-
- get_npages = get_user_pages(current, current->mm, start,
- npages, 1, 1, pages, NULL);
- get_npages = max(get_npages, 0);
- if (get_npages != npages) {
- DRM_ERROR("failed to get user_pages.\n");
- while (get_npages)
- put_page(pages[--get_npages]);
- return -EFAULT;
- }
-
- return 0;
-}
-
-void exynos_gem_put_pages_to_userptr(struct page **pages,
- unsigned int npages,
- struct vm_area_struct *vma)
-{
- if (!vma_is_io(vma)) {
- unsigned int i;
-
- for (i = 0; i < npages; i++) {
- set_page_dirty_lock(pages[i]);
-
- /*
- * undo the reference we took when populating
- * the table.
- */
- put_page(pages[i]);
- }
- }
-}
-
int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
struct sg_table *sgt,
enum dma_data_direction dir)
void exynos_drm_gem_free_object(struct drm_gem_object *obj)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
- struct exynos_drm_gem_buf *buf;
-
- exynos_gem_obj = to_exynos_gem_obj(obj);
- buf = exynos_gem_obj->buffer;
-
- if (obj->import_attach)
- drm_prime_gem_destroy(obj, buf->sgt);
-
- exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
+ exynos_drm_gem_destroy(to_exynos_gem(obj));
}
int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem *exynos_gem;
+ unsigned int flags;
int ret;
/*
args->pitch = args->width * ((args->bpp + 7) / 8);
args->size = args->pitch * args->height;
- if (is_drm_iommu_supported(dev)) {
- exynos_gem_obj = exynos_drm_gem_create(dev,
- EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
- args->size);
- } else {
- exynos_gem_obj = exynos_drm_gem_create(dev,
- EXYNOS_BO_CONTIG | EXYNOS_BO_WC,
- args->size);
- }
+ if (is_drm_iommu_supported(dev))
+ flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
+ else
+ flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
- if (IS_ERR(exynos_gem_obj)) {
+ exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
+ if (IS_ERR(exynos_gem)) {
dev_warn(dev->dev, "FB allocation failed.\n");
- return PTR_ERR(exynos_gem_obj);
+ return PTR_ERR(exynos_gem);
}
- ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
- &args->handle);
+ ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
+ &args->handle);
if (ret) {
- exynos_drm_gem_destroy(exynos_gem_obj);
+ exynos_drm_gem_destroy(exynos_gem);
return ret;
}
goto unlock;
}
- ret = drm_gem_create_mmap_offset(obj);
- if (ret)
- goto out;
-
*offset = drm_vma_node_offset_addr(&obj->vma_node);
DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
-out:
drm_gem_object_unreference(obj);
unlock:
mutex_unlock(&dev->struct_mutex);
int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct drm_gem_object *obj = vma->vm_private_data;
- struct drm_device *dev = obj->dev;
- unsigned long f_vaddr;
+ struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
+ unsigned long pfn;
pgoff_t page_offset;
int ret;
page_offset = ((unsigned long)vmf->virtual_address -
vma->vm_start) >> PAGE_SHIFT;
- f_vaddr = (unsigned long)vmf->virtual_address;
-
- mutex_lock(&dev->struct_mutex);
- ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
- if (ret < 0)
- DRM_ERROR("failed to map a buffer with user.\n");
+ if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
+ DRM_ERROR("invalid page offset\n");
+ ret = -EINVAL;
+ goto out;
+ }
- mutex_unlock(&dev->struct_mutex);
+ pfn = page_to_pfn(exynos_gem->pages[page_offset]);
+ ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
- return convert_to_vm_err_msg(ret);
+out:
+ switch (ret) {
+ case 0:
+ case -ERESTARTSYS:
+ case -EINTR:
+ return VM_FAULT_NOPAGE;
+ case -ENOMEM:
+ return VM_FAULT_OOM;
+ default:
+ return VM_FAULT_SIGBUS;
+ }
}
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
- struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem *exynos_gem;
struct drm_gem_object *obj;
int ret;
}
obj = vma->vm_private_data;
- exynos_gem_obj = to_exynos_gem_obj(obj);
+ exynos_gem = to_exynos_gem(obj);
- ret = check_gem_flags(exynos_gem_obj->flags);
- if (ret)
- goto err_close_vm;
+ DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
- update_vm_cache_attr(exynos_gem_obj, vma);
+ /* non-cachable as default. */
+ if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ else if (exynos_gem->flags & EXYNOS_BO_WC)
+ vma->vm_page_prot =
+ pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+ else
+ vma->vm_page_prot =
+ pgprot_noncached(vm_get_page_prot(vma->vm_flags));
- ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma);
+ ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
if (ret)
goto err_close_vm;
err_close_vm:
drm_gem_vm_close(vma);
- drm_gem_free_mmap_offset(obj);
return ret;
}
+
+/* low-level interface prime helpers */
+struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+ struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
+ int npages;
+
+ npages = exynos_gem->size >> PAGE_SHIFT;
+
+ return drm_prime_pages_to_sg(exynos_gem->pages, npages);
+}
+
+struct drm_gem_object *
+exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sgt)
+{
+ struct exynos_drm_gem *exynos_gem;
+ int npages;
+ int ret;
+
+ exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
+ if (IS_ERR(exynos_gem)) {
+ ret = PTR_ERR(exynos_gem);
+ return ERR_PTR(ret);
+ }
+
+ exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
+
+ npages = exynos_gem->size >> PAGE_SHIFT;
+ exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *));
+ if (!exynos_gem->pages) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
+ npages);
+ if (ret < 0)
+ goto err_free_large;
+
+ exynos_gem->sgt = sgt;
+
+ if (sgt->nents == 1) {
+ /* always physically continuous memory if sgt->nents is 1. */
+ exynos_gem->flags |= EXYNOS_BO_CONTIG;
+ } else {
+ /*
+ * this case could be CONTIG or NONCONTIG type but for now
+ * sets NONCONTIG.
+ * TODO. we have to find a way that exporter can notify
+ * the type of its own buffer to importer.
+ */
+ exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
+ }
+
+ return &exynos_gem->base;
+
+err_free_large:
+ drm_free_large(exynos_gem->pages);
+err:
+ drm_gem_object_release(&exynos_gem->base);
+ kfree(exynos_gem);
+ return ERR_PTR(ret);
+}
+
+void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
+{
+ return NULL;
+}
+
+void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+ /* Nothing to do */
+}
Code Review / kvmfornfv.git / blobdiff