Re: [PATCH v2 06/17] media: videobuf2: Move frame_vector into media subsystem

From: Daniel Vetter
Date: Fri Oct 09 2020 - 12:57:49 EST

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On Fri, Oct 09, 2020 at 12:14:17PM +0200, Mauro Carvalho Chehab wrote:
> Em Fri, 9 Oct 2020 09:59:23 +0200
> Daniel Vetter <daniel.vetter@xxxxxxxx> escreveu:
>
> > 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@xxxxxxxxxx>
> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> > Cc: Jason Gunthorpe <jgg@xxxxxxxx>
> > Cc: Pawel Osciak <pawel@xxxxxxxxxx>
> > Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> > Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> > Cc: Tomasz Figa <tfiga@xxxxxxxxxxxx>
> > Cc: Mauro Carvalho Chehab <mchehab@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
> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > ---
> > 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/videobuf2-core.h | 42 +++++++++++++++++++
> > mm/Kconfig | 3 --
> > mm/Makefile | 1 -
> > 8 files changed, 45 insertions(+), 48 deletions(-)
> > rename {mm => drivers/media/common/videobuf2}/frame_vector.c (99%)
> >
> > 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..2b0b97761d15 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/videobuf2-core.h>
> > +
>
> See my comment below...
>
> > /**
> > * 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/videobuf2-core.h b/include/media/videobuf2-core.h
> > index bbb3f26fbde9..a2e75ca0334f 100644
> > --- a/include/media/videobuf2-core.h
> > +++ b/include/media/videobuf2-core.h
> > @@ -1254,4 +1254,46 @@ bool vb2_request_object_is_buffer(struct media_request_object *obj);
> > */
> > unsigned int vb2_request_buffer_cnt(struct media_request *req);
> >
> > +/* 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_VIDEOBUF2_CORE_H */
>
> Please place those into a include/media/frame_vector.h file, instead of
> merging it directly at vb2 core header.
>
> Then include the new header at videobuf2-core.h and at frame_vector.c.

Makes sense, I'll do that for v3.

> With such changes:
>
> Acked-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>

Thanks for taking a look.
-Daniel

>
> > 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
>
>
>
> Thanks,
> Mauro

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Next message: Brigham Campbell: "[PATCH] ARM: dts: Add empty "chosen" node to WM8xxx device trees"
Previous message: Matthias Kaehlcke: "Re: [PATCH 1/2] arm64: dts: qcom: sc7180: Add gpu cooling support"
In reply to: Mauro Carvalho Chehab: "Re: [PATCH v2 06/17] media: videobuf2: Move frame_vector into media subsystem"
Next in thread: Daniel Vetter: "[PATCH v2 09/17] mm: Add unsafe_follow_pfn"
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