On 10/7/20 9:44 AM, Daniel Vetter wrote:
All we need are a pages array, pin_user_pages_fast can give us that
directly. Plus this avoids the entire raw pfn side of get_vaddr_frames.
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Kukjin Kim <kgene@xxxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
Cc: linux-media@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/exynos/Kconfig | 1 -
drivers/gpu/drm/exynos/exynos_drm_g2d.c | 48 ++++++++++++-------------
2 files changed, 22 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/exynos/Kconfig b/drivers/gpu/drm/exynos/Kconfig
index 6417f374b923..43257ef3c09d 100644
--- a/drivers/gpu/drm/exynos/Kconfig
+++ b/drivers/gpu/drm/exynos/Kconfig
@@ -88,7 +88,6 @@ comment "Sub-drivers"
config DRM_EXYNOS_G2D
bool "G2D"
depends on VIDEO_SAMSUNG_S5P_G2D=n || COMPILE_TEST
- select FRAME_VECTOR
help
Choose this option if you want to use Exynos G2D for DRM.
diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
index 967a5cdc120e..c83f6faac9de 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -205,7 +205,8 @@ struct g2d_cmdlist_userptr {
dma_addr_t dma_addr;
unsigned long userptr;
unsigned long size;
- struct frame_vector *vec;
+ struct page **pages;
+ unsigned int npages;
struct sg_table *sgt;
atomic_t refcount;
bool in_pool;
@@ -378,7 +379,7 @@ static void g2d_userptr_put_dma_addr(struct g2d_data *g2d,
bool force)
{
struct g2d_cmdlist_userptr *g2d_userptr = obj;
- struct page **pages;
+ int i;
The above line can also be deleted, see below.
if (!obj)
return;
@@ -398,15 +399,11 @@ static void g2d_userptr_put_dma_addr(struct g2d_data *g2d,
dma_unmap_sgtable(to_dma_dev(g2d->drm_dev), g2d_userptr->sgt,
DMA_BIDIRECTIONAL, 0);
- pages = frame_vector_pages(g2d_userptr->vec);
- if (!IS_ERR(pages)) {
- int i;
+ for (i = 0; i < g2d_userptr->npages; i++)
+ set_page_dirty_lock(g2d_userptr->pages[i]);
- for (i = 0; i < frame_vector_count(g2d_userptr->vec); i++)
- set_page_dirty_lock(pages[i]);
- }
- put_vaddr_frames(g2d_userptr->vec);
- frame_vector_destroy(g2d_userptr->vec);
+ unpin_user_pages(g2d_userptr->pages, g2d_userptr->npages);
+ kvfree(g2d_userptr->pages);
You can avoid writing your own loop, and just simplify the whole thing down to
two lines:
unpin_user_pages_dirty_lock(g2d_userptr->pages, g2d_userptr->npages,
true);
kvfree(g2d_userptr->pages);
if (!g2d_userptr->out_of_list)
list_del_init(&g2d_userptr->list);
@@ -474,35 +471,34 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d,
offset = userptr & ~PAGE_MASK;
end = PAGE_ALIGN(userptr + size);
npages = (end - start) >> PAGE_SHIFT;
- g2d_userptr->vec = frame_vector_create(npages);
- if (!g2d_userptr->vec) {
+ g2d_userptr->pages = kvmalloc_array(npages, sizeof(*g2d_userptr->pages),
+ GFP_KERNEL);
+ if (!g2d_userptr->pages) {
ret = -ENOMEM;
goto err_free;
}
- ret = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE,
- g2d_userptr->vec);
+ ret = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE,
+ g2d_userptr->pages);
if (ret != npages) {
DRM_DEV_ERROR(g2d->dev,
"failed to get user pages from userptr.\n");
if (ret < 0)
- goto err_destroy_framevec;
- ret = -EFAULT;
- goto err_put_framevec;
- }
- if (frame_vector_to_pages(g2d_userptr->vec) < 0) {
+ goto err_destroy_pages;
+ npages = ret;
ret = -EFAULT;
- goto err_put_framevec;
+ goto err_unpin_pages;
}
+ g2d_userptr->npages = npages;
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt) {
ret = -ENOMEM;
- goto err_put_framevec;
+ goto err_unpin_pages;
}
ret = sg_alloc_table_from_pages(sgt,
- frame_vector_pages(g2d_userptr->vec),
+ g2d_userptr->pages,
npages, offset, size, GFP_KERNEL);
if (ret < 0) {
DRM_DEV_ERROR(g2d->dev, "failed to get sgt from pages.\n");
@@ -538,11 +534,11 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d,
err_free_sgt:
kfree(sgt);
-err_put_framevec:
- put_vaddr_frames(g2d_userptr->vec);
+err_unpin_pages:
+ unpin_user_pages(g2d_userptr->pages, npages);
-err_destroy_framevec:
- frame_vector_destroy(g2d_userptr->vec);
+err_destroy_pages:
+ kvfree(g2d_userptr->pages);
err_free:
kfree(g2d_userptr);
The rest all looks good, you've avoided the usual API pitfalls. :)
thanks,
--
John Hubbard
NVIDIA
