* [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area @ 2018-02-05 2:30 ` Masami Hiramatsu 2018-02-05 4:54 ` Masami Hiramatsu 2018-02-05 8:47 ` Marek Szyprowski 0 siblings, 2 replies; 4+ messages in thread From: Masami Hiramatsu @ 2018-02-05 2:30 UTC (permalink / raw) To: Pawel Osciak, Marek Szyprowski, Kyungmin Park Cc: mhiramat, Mauro Carvalho Chehab, linux-media, linux-kernel, orito.takao Fixes vb2_vmalloc_get_userptr() to ioremap correct area. Since the current code does ioremap the page address, if the offset > 0, it does not do ioremap the last page and results in kernel panic. This fixes to pass the page address + offset to ioremap so that ioremap can map correct area. Also, this uses __pfn_to_phys() to get the physical address of given PFN. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Reported-by: Takao Orito <orito.takao@socionext.com> --- drivers/media/v4l2-core/videobuf2-vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c index 3a7c80cd1a17..896f2f378b40 100644 --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c @@ -106,7 +106,7 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr, if (nums[i-1] + 1 != nums[i]) goto fail_map; buf->vaddr = (__force void *) - ioremap_nocache(nums[0] << PAGE_SHIFT, size); + ioremap_nocache(__pfn_to_phys(nums[0]) + offset, size); } else { buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1, PAGE_KERNEL); ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area 2018-02-05 2:30 ` [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area Masami Hiramatsu @ 2018-02-05 4:54 ` Masami Hiramatsu 2018-02-05 8:47 ` Marek Szyprowski 1 sibling, 0 replies; 4+ messages in thread From: Masami Hiramatsu @ 2018-02-05 4:54 UTC (permalink / raw) To: Pawel Osciak, Marek Szyprowski, Kyungmin Park, Masami Hiramatsu Cc: Mauro Carvalho Chehab, linux-media, linux-kernel, orito.takao, masami.hiramatsu On Mon, 5 Feb 2018 11:30:41 +0900 Masami Hiramatsu <mhiramat@kernel.org> wrote: > Fixes vb2_vmalloc_get_userptr() to ioremap correct area. > Since the current code does ioremap the page address, if the offset > 0, > it does not do ioremap the last page and results in kernel panic. > > This fixes to pass the page address + offset to ioremap so that ioremap > can map correct area. Also, this uses __pfn_to_phys() to get the physical > address of given PFN. > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > Reported-by: Takao Orito <orito.takao@socionext.com> Oops, I've missed the original reporter. Reported-by: Fumihiro ATSUMI <atsumi@infinitegra.co.jp> Thank you, > --- > drivers/media/v4l2-core/videobuf2-vmalloc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c > index 3a7c80cd1a17..896f2f378b40 100644 > --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c > +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c > @@ -106,7 +106,7 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr, > if (nums[i-1] + 1 != nums[i]) > goto fail_map; > buf->vaddr = (__force void *) > - ioremap_nocache(nums[0] << PAGE_SHIFT, size); > + ioremap_nocache(__pfn_to_phys(nums[0]) + offset, size); > } else { > buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1, > PAGE_KERNEL); > -- Masami Hiramatsu <mhiramat@kernel.org> ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area 2018-02-05 2:30 ` [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area Masami Hiramatsu 2018-02-05 4:54 ` Masami Hiramatsu @ 2018-02-05 8:47 ` Marek Szyprowski 2018-02-05 13:51 ` Masami Hiramatsu 1 sibling, 1 reply; 4+ messages in thread From: Marek Szyprowski @ 2018-02-05 8:47 UTC (permalink / raw) To: Masami Hiramatsu, Pawel Osciak, Kyungmin Park Cc: Mauro Carvalho Chehab, linux-media, linux-kernel, orito.takao, Fumihiro ATSUMI Hi Masami, On 2018-02-05 03:30, Masami Hiramatsu wrote: > Fixes vb2_vmalloc_get_userptr() to ioremap correct area. > Since the current code does ioremap the page address, if the offset > 0, > it does not do ioremap the last page and results in kernel panic. > > This fixes to pass the page address + offset to ioremap so that ioremap > can map correct area. Also, this uses __pfn_to_phys() to get the physical > address of given PFN. > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > Reported-by: Takao Orito <orito.takao@socionext.com> > --- > drivers/media/v4l2-core/videobuf2-vmalloc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c > index 3a7c80cd1a17..896f2f378b40 100644 > --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c > +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c > @@ -106,7 +106,7 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr, > if (nums[i-1] + 1 != nums[i]) > goto fail_map; > buf->vaddr = (__force void *) > - ioremap_nocache(nums[0] << PAGE_SHIFT, size); > + ioremap_nocache(__pfn_to_phys(nums[0]) + offset, size); Thanks for reporting this issue. However the above line doesn't look like a proper fix. Please note that at the end of that function there is already "buf->vaddr += offset;". IMHO the proper fix is to create a larger mapping, which would include the in-page start offset: ioremap_nocache(__pfn_to_phys(nums[0]), offset + size); BTW, thanks for updating "<< PAGE_SHIFT" to better __pfn_to_phys() macro! > } else { > buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1, > PAGE_KERNEL); > > > > Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area 2018-02-05 8:47 ` Marek Szyprowski @ 2018-02-05 13:51 ` Masami Hiramatsu 0 siblings, 0 replies; 4+ messages in thread From: Masami Hiramatsu @ 2018-02-05 13:51 UTC (permalink / raw) To: Marek Szyprowski Cc: Pawel Osciak, Kyungmin Park, Mauro Carvalho Chehab, linux-media, linux-kernel, orito.takao, Fumihiro ATSUMI On Mon, 05 Feb 2018 09:47:46 +0100 Marek Szyprowski <m.szyprowski@samsung.com> wrote: > Hi Masami, > > On 2018-02-05 03:30, Masami Hiramatsu wrote: > > Fixes vb2_vmalloc_get_userptr() to ioremap correct area. > > Since the current code does ioremap the page address, if the offset > 0, > > it does not do ioremap the last page and results in kernel panic. > > > > This fixes to pass the page address + offset to ioremap so that ioremap > > can map correct area. Also, this uses __pfn_to_phys() to get the physical > > address of given PFN. > > > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > > Reported-by: Takao Orito <orito.takao@socionext.com> > > --- > > drivers/media/v4l2-core/videobuf2-vmalloc.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c > > index 3a7c80cd1a17..896f2f378b40 100644 > > --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c > > +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c > > @@ -106,7 +106,7 @@ static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr, > > if (nums[i-1] + 1 != nums[i]) > > goto fail_map; > > buf->vaddr = (__force void *) > > - ioremap_nocache(nums[0] << PAGE_SHIFT, size); > > + ioremap_nocache(__pfn_to_phys(nums[0]) + offset, size); > > Thanks for reporting this issue. However the above line doesn't look like > a proper fix. Please note that at the end of that function there is already > "buf->vaddr += offset;". I see. > > IMHO the proper fix is to create a larger mapping, which would include the > in-page start offset: > > ioremap_nocache(__pfn_to_phys(nums[0]), offset + size); Yes, sorry it's my mistake. I misunderstood ioremap_nocache(addr, size) remaps the PAGE of addr to PAGE of (addr+size). Yours is correct. Thank you, > BTW, thanks for updating "<< PAGE_SHIFT" to better __pfn_to_phys() macro! > > > } else { > > buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1, > > PAGE_KERNEL); > > > > > > > > > > Best regards > -- > Marek Szyprowski, PhD > Samsung R&D Institute Poland > -- Masami Hiramatsu <mhiramat@kernel.org> ^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-02-05 2:30 ` [PATCH] [BUGFIX] media: vb2: Fix videobuf2 to map correct area Masami Hiramatsu
2018-02-05 4:54 ` Masami Hiramatsu
2018-02-05 8:47 ` Marek Szyprowski
2018-02-05 13:51 ` Masami Hiramatsu
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