On Wed, Apr 26, 2017 at 02:12:30PM -0700, Laura Abbott wrote:
> Enable the GEM dma-buf import interfaces in addition to the export
> interfaces. This lets vgem be used as a test source for other allocators
> (e.g. Ion).
>
> Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
> ---
> v2: Don't require vgem allocated buffers to existing in memory before importing.
> ---
> drivers/gpu/drm/vgem/vgem_drv.c | 133 +++++++++++++++++++++++++++++++---------
> drivers/gpu/drm/vgem/vgem_drv.h | 2 +
> 2 files changed, 106 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
> index 1b02e56..73a619a 100644
> --- a/drivers/gpu/drm/vgem/vgem_drv.c
> +++ b/drivers/gpu/drm/vgem/vgem_drv.c
> @@ -34,6 +34,9 @@
> #include <linux/ramfs.h>
> #include <linux/shmem_fs.h>
> #include <linux/dma-buf.h>
> +
> +#include <drm/drmP.h>
> +
> #include "vgem_drv.h"
>
> #define DRIVER_NAME "vgem"
> @@ -46,6 +49,12 @@ static void vgem_gem_free_object(struct drm_gem_object *obj)
> {
> struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
>
> + if (vgem_obj->pages)
> + drm_free_large(vgem_obj->pages);
Just drm_free_large(vgem_obj->pages); NULL -> kfree() which is NULL safe.
The series lgtm, doesn't compromise on any of the existing tests.
All 3,
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
You could always get Joonas to nitpick over style...
> +
> + if (obj->import_attach)
> + drm_prime_gem_destroy(obj, vgem_obj->table);
> +
> drm_gem_object_release(obj);
> kfree(vgem_obj);
> }
> @@ -56,26 +65,48 @@ static int vgem_gem_fault(struct vm_fault *vmf)
> struct drm_vgem_gem_object *obj = vma->vm_private_data;
> /* We don't use vmf->pgoff since that has the fake offset */
> unsigned long vaddr = vmf->address;
> - struct page *page;
> -
> - page = shmem_read_mapping_page(file_inode(obj->base.filp)->i_mapping,
> - (vaddr - vma->vm_start) >> PAGE_SHIFT);
> - if (!IS_ERR(page)) {
> - vmf->page = page;
> - return 0;
> - } else switch (PTR_ERR(page)) {
> - case -ENOSPC:
> - case -ENOMEM:
> - return VM_FAULT_OOM;
> - case -EBUSY:
> - return VM_FAULT_RETRY;
> - case -EFAULT:
> - case -EINVAL:
> - return VM_FAULT_SIGBUS;
> - default:
> - WARN_ON_ONCE(PTR_ERR(page));
> - return VM_FAULT_SIGBUS;
> + int ret;
> + loff_t num_pages;
> + pgoff_t page_offset;
> + page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
> +
> + num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
> +
> + if (page_offset > num_pages)
> + return VM_FAULT_SIGBUS;
> +
> + if (obj->pages) {
> + get_page(obj->pages[page_offset]);
> + vmf->page = obj->pages[page_offset];
> + ret = 0;
> + } else {
> + struct page *page;
> +
> + page = shmem_read_mapping_page(
> + file_inode(obj->base.filp)->i_mapping,
> + page_offset);
> + if (!IS_ERR(page)) {
> + vmf->page = page;
> + ret = 0;
> + } else switch (PTR_ERR(page)) {
> + case -ENOSPC:
> + case -ENOMEM:
> + ret = VM_FAULT_OOM;
> + break;
> + case -EBUSY:
> + ret = VM_FAULT_RETRY;
> + break;
> + case -EFAULT:
> + case -EINVAL:
> + ret = VM_FAULT_SIGBUS;
> + break;
> + default:
> + WARN_ON(PTR_ERR(page));
> + ret = VM_FAULT_SIGBUS;
break;
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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