| Message ID | 20191030224930.3990755-14-jhubbard@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM | expand |
On Wed, Oct 30, 2019 at 03:49:24PM -0700, John Hubbard wrote: > 1. Change v4l2 from get_user_pages(FOLL_LONGTERM), to > pin_longterm_pages(), which sets both FOLL_LONGTERM and FOLL_PIN. > > 2. Because all FOLL_PIN-acquired pages must be released via > put_user_page(), also convert the put_page() call over to > put_user_pages_dirty_lock(). > Reviewed-by: Ira Weiny <ira.weiny@intel.com> > Cc: Mauro Carvalho Chehab <mchehab@kernel.org> > Signed-off-by: John Hubbard <jhubbard@nvidia.com> > --- > drivers/media/v4l2-core/videobuf-dma-sg.c | 13 +++++-------- > 1 file changed, 5 insertions(+), 8 deletions(-) > > diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c > index 28262190c3ab..9b9c5b37bf59 100644 > --- a/drivers/media/v4l2-core/videobuf-dma-sg.c > +++ b/drivers/media/v4l2-core/videobuf-dma-sg.c > @@ -183,12 +183,12 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, > dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", > data, size, dma->nr_pages); > > - err = get_user_pages(data & PAGE_MASK, dma->nr_pages, > - flags | FOLL_LONGTERM, dma->pages, NULL); > + err = pin_longterm_pages(data & PAGE_MASK, dma->nr_pages, > + flags, dma->pages, NULL); > > if (err != dma->nr_pages) { > dma->nr_pages = (err >= 0) ? err : 0; > - dprintk(1, "get_user_pages: err=%d [%d]\n", err, > + dprintk(1, "pin_longterm_pages: err=%d [%d]\n", err, > dma->nr_pages); > return err < 0 ? err : -EINVAL; > } > @@ -349,11 +349,8 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma) > BUG_ON(dma->sglen); > > if (dma->pages) { > - for (i = 0; i < dma->nr_pages; i++) { > - if (dma->direction == DMA_FROM_DEVICE) > - set_page_dirty_lock(dma->pages[i]); > - put_page(dma->pages[i]); > - } > + put_user_pages_dirty_lock(dma->pages, dma->nr_pages, > + dma->direction == DMA_FROM_DEVICE); > kfree(dma->pages); > dma->pages = NULL; > } > -- > 2.23.0 >
diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c index 28262190c3ab..9b9c5b37bf59 100644 --- a/drivers/media/v4l2-core/videobuf-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf-dma-sg.c @@ -183,12 +183,12 @@ static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma, dprintk(1, "init user [0x%lx+0x%lx => %d pages]\n", data, size, dma->nr_pages); - err = get_user_pages(data & PAGE_MASK, dma->nr_pages, - flags | FOLL_LONGTERM, dma->pages, NULL); + err = pin_longterm_pages(data & PAGE_MASK, dma->nr_pages, + flags, dma->pages, NULL); if (err != dma->nr_pages) { dma->nr_pages = (err >= 0) ? err : 0; - dprintk(1, "get_user_pages: err=%d [%d]\n", err, + dprintk(1, "pin_longterm_pages: err=%d [%d]\n", err, dma->nr_pages); return err < 0 ? err : -EINVAL; } @@ -349,11 +349,8 @@ int videobuf_dma_free(struct videobuf_dmabuf *dma) BUG_ON(dma->sglen); if (dma->pages) { - for (i = 0; i < dma->nr_pages; i++) { - if (dma->direction == DMA_FROM_DEVICE) - set_page_dirty_lock(dma->pages[i]); - put_page(dma->pages[i]); - } + put_user_pages_dirty_lock(dma->pages, dma->nr_pages, + dma->direction == DMA_FROM_DEVICE); kfree(dma->pages); dma->pages = NULL; }
1. Change v4l2 from get_user_pages(FOLL_LONGTERM), to pin_longterm_pages(), which sets both FOLL_LONGTERM and FOLL_PIN. 2. Because all FOLL_PIN-acquired pages must be released via put_user_page(), also convert the put_page() call over to put_user_pages_dirty_lock(). Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: John Hubbard <jhubbard@nvidia.com> --- drivers/media/v4l2-core/videobuf-dma-sg.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-)