Re: [PATCH v4 06/15] media: videobuf2: Move frame_vector into media subsystem

Tomasz Figa
2020-10-26T22:04:02Z

On Mon, Oct 26, 2020 at 11:58:09AM +0100, Daniel Vetter wrote:
> It's the only user. This also garbage collects the CONFIG_FRAME_VECTOR
> symbol from all over the tree (well just one place, somehow omap media
> driver still had this in its Kconfig, despite not using it).
>
> Reviewed-by: John Hubbard <jhubbard@nvidia.com>
> Acked-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: Pawel Osciak <pawel@osciak.com>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Kyungmin Park <kyungmin.park@samsung.com>
> Cc: Tomasz Figa <tfiga@chromium.org>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: John Hubbard <jhubbard@nvidia.com>
> Cc: Jérôme Glisse <jglisse@redhat.com>
> Cc: Jan Kara <jack@suse.cz>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: linux-mm@kvack.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-samsung-soc@vger.kernel.org
> Cc: linux-media@vger.kernel.org
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> --
> v3:
> - Create a new frame_vector.h header for this (Mauro)
> ---
> drivers/media/common/videobuf2/Kconfig | 1 -
> drivers/media/common/videobuf2/Makefile | 1 +
> .../media/common/videobuf2}/frame_vector.c | 2 +
> drivers/media/platform/omap/Kconfig | 1 -
> include/linux/mm.h | 42 -----------------
> include/media/frame_vector.h | 47 +++++++++++++++++++
> include/media/videobuf2-core.h | 1 +
> mm/Kconfig | 3 --
> mm/Makefile | 1 -
> 9 files changed, 51 insertions(+), 48 deletions(-)
> rename {mm => drivers/media/common/videobuf2}/frame_vector.c (99%)
> create mode 100644 include/media/frame_vector.h
>

Acked-by: Tomasz Figa <tfiga@chromium.org>

Best regards,
Tomasz

> diff --git a/drivers/media/common/videobuf2/Kconfig b/drivers/media/common/videobuf2/Kconfig
> index edbc99ebba87..d2223a12c95f 100644
> --- a/drivers/media/common/videobuf2/Kconfig
> +++ b/drivers/media/common/videobuf2/Kconfig
> @@ -9,7 +9,6 @@ config VIDEOBUF2_V4L2
>
> config VIDEOBUF2_MEMOPS
> tristate
> - select FRAME_VECTOR
>
> config VIDEOBUF2_DMA_CONTIG
> tristate
> diff --git a/drivers/media/common/videobuf2/Makefile b/drivers/media/common/videobuf2/Makefile
> index 77bebe8b202f..54306f8d096c 100644
> --- a/drivers/media/common/videobuf2/Makefile
> +++ b/drivers/media/common/videobuf2/Makefile
> @@ -1,5 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> videobuf2-common-objs := videobuf2-core.o
> +videobuf2-common-objs += frame_vector.o
>
> ifeq ($(CONFIG_TRACEPOINTS),y)
> videobuf2-common-objs += vb2-trace.o
> diff --git a/mm/frame_vector.c b/drivers/media/common/videobuf2/frame_vector.c
> similarity index 99%
> rename from mm/frame_vector.c
> rename to drivers/media/common/videobuf2/frame_vector.c
> index d44779e56313..6590987c14bd 100644
> --- a/mm/frame_vector.c
> +++ b/drivers/media/common/videobuf2/frame_vector.c
> @@ -8,6 +8,8 @@
> #include <linux/pagemap.h>
> #include <linux/sched.h>
>
> +#include <media/frame_vector.h>
> +
> /**
> * get_vaddr_frames() - map virtual addresses to pfns
> * @start: starting user address
> diff --git a/drivers/media/platform/omap/Kconfig b/drivers/media/platform/omap/Kconfig
> index f73b5893220d..de16de46c0f4 100644
> --- a/drivers/media/platform/omap/Kconfig
> +++ b/drivers/media/platform/omap/Kconfig
> @@ -12,6 +12,5 @@ config VIDEO_OMAP2_VOUT
> depends on VIDEO_V4L2
> select VIDEOBUF2_DMA_CONTIG
> select OMAP2_VRFB if ARCH_OMAP2 || ARCH_OMAP3
> - select FRAME_VECTOR
> help
> V4L2 Display driver support for OMAP2/3 based boards.
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 16b799a0522c..acd60fbf1a5a 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1743,48 +1743,6 @@ int account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc);
> int __account_locked_vm(struct mm_struct *mm, unsigned long pages, bool inc,
> struct task_struct *task, bool bypass_rlim);
>
> -/* Container for pinned pfns / pages */
> -struct frame_vector {
> - unsigned int nr_allocated; /* Number of frames we have space for */
> - unsigned int nr_frames; /* Number of frames stored in ptrs array */
> - bool got_ref; /* Did we pin pages by getting page ref? */
> - bool is_pfns; /* Does array contain pages or pfns? */
> - void *ptrs[]; /* Array of pinned pfns / pages. Use
> - * pfns_vector_pages() or pfns_vector_pfns()
> - * for access */
> -};
> -
> -struct frame_vector *frame_vector_create(unsigned int nr_frames);
> -void frame_vector_destroy(struct frame_vector *vec);
> -int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
> - unsigned int gup_flags, struct frame_vector *vec);
> -void put_vaddr_frames(struct frame_vector *vec);
> -int frame_vector_to_pages(struct frame_vector *vec);
> -void frame_vector_to_pfns(struct frame_vector *vec);
> -
> -static inline unsigned int frame_vector_count(struct frame_vector *vec)
> -{
> - return vec->nr_frames;
> -}
> -
> -static inline struct page **frame_vector_pages(struct frame_vector *vec)
> -{
> - if (vec->is_pfns) {
> - int err = frame_vector_to_pages(vec);
> -
> - if (err)
> - return ERR_PTR(err);
> - }
> - return (struct page **)(vec->ptrs);
> -}
> -
> -static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
> -{
> - if (!vec->is_pfns)
> - frame_vector_to_pfns(vec);
> - return (unsigned long *)(vec->ptrs);
> -}
> -
> struct kvec;
> int get_kernel_pages(const struct kvec *iov, int nr_pages, int write,
> struct page **pages);
> diff --git a/include/media/frame_vector.h b/include/media/frame_vector.h
> new file mode 100644
> index 000000000000..1ed0cd64510d
> --- /dev/null
> +++ b/include/media/frame_vector.h
> @@ -0,0 +1,47 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#ifndef _MEDIA_FRAME_VECTOR_H
> +#define _MEDIA_FRAME_VECTOR_H
> +
> +/* Container for pinned pfns / pages in frame_vector.c */
> +struct frame_vector {
> + unsigned int nr_allocated; /* Number of frames we have space for */
> + unsigned int nr_frames; /* Number of frames stored in ptrs array */
> + bool got_ref; /* Did we pin pages by getting page ref? */
> + bool is_pfns; /* Does array contain pages or pfns? */
> + void *ptrs[]; /* Array of pinned pfns / pages. Use
> + * pfns_vector_pages() or pfns_vector_pfns()
> + * for access */
> +};
> +
> +struct frame_vector *frame_vector_create(unsigned int nr_frames);
> +void frame_vector_destroy(struct frame_vector *vec);
> +int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
> + unsigned int gup_flags, struct frame_vector *vec);
> +void put_vaddr_frames(struct frame_vector *vec);
> +int frame_vector_to_pages(struct frame_vector *vec);
> +void frame_vector_to_pfns(struct frame_vector *vec);
> +
> +static inline unsigned int frame_vector_count(struct frame_vector *vec)
> +{
> + return vec->nr_frames;
> +}
> +
> +static inline struct page **frame_vector_pages(struct frame_vector *vec)
> +{
> + if (vec->is_pfns) {
> + int err = frame_vector_to_pages(vec);
> +
> + if (err)
> + return ERR_PTR(err);
> + }
> + return (struct page **)(vec->ptrs);
> +}
> +
> +static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
> +{
> + if (!vec->is_pfns)
> + frame_vector_to_pfns(vec);
> + return (unsigned long *)(vec->ptrs);
> +}
> +
> +#endif /* _MEDIA_FRAME_VECTOR_H */
> diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
> index bbb3f26fbde9..d045e3a5a1d8 100644
> --- a/include/media/videobuf2-core.h
> +++ b/include/media/videobuf2-core.h
> @@ -18,6 +18,7 @@
> #include <linux/dma-buf.h>
> #include <linux/bitops.h>
> #include <media/media-request.h>
> +#include <media/frame_vector.h>
>
> #define VB2_MAX_FRAME (32)
> #define VB2_MAX_PLANES (8)
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 6c974888f86f..da6c943fe9f1 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -815,9 +815,6 @@ config DEVICE_PRIVATE
> memory; i.e., memory that is only accessible from the device (or
> group of devices). You likely also want to select HMM_MIRROR.
>
> -config FRAME_VECTOR
> - bool
> -
> config ARCH_USES_HIGH_VMA_FLAGS
> bool
> config ARCH_HAS_PKEYS
> diff --git a/mm/Makefile b/mm/Makefile
> index d5649f1c12c0..a025fd6c6afd 100644
> --- a/mm/Makefile
> +++ b/mm/Makefile
> @@ -111,7 +111,6 @@ obj-$(CONFIG_PAGE_EXTENSION) += page_ext.o
> obj-$(CONFIG_CMA_DEBUGFS) += cma_debug.o
> obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
> obj-$(CONFIG_IDLE_PAGE_TRACKING) += page_idle.o
> -obj-$(CONFIG_FRAME_VECTOR) += frame_vector.o
> obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o
> obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o
> obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o
> --
> 2.28.0
>