| Message ID | 1486113624-7494-2-git-send-email-alexandre.torgue@st.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi, Apologize for this bad sent. Please forget it. regards On 02/03/2017 10:20 AM, Alexandre TORGUE wrote: > From: Vladimir Murzin <vladimir.murzin@arm.com> > > This patch adds a simple implementation of mmap to dma_noop_ops. > > Cc: Joerg Roedel <jroedel@suse.de> > Cc: Christian Borntraeger <borntraeger@de.ibm.com> > Reported-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> > Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> > Tested-by: Andras Szemzo <sza@esh.hu> > Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> > --- > lib/dma-noop.c | 21 +++++++++++++++++++++ > 1 file changed, 21 insertions(+) > > diff --git a/lib/dma-noop.c b/lib/dma-noop.c > index a14eee5..70504eb 100644 > --- a/lib/dma-noop.c > +++ b/lib/dma-noop.c > @@ -66,6 +66,26 @@ static int dma_noop_supported(struct device *dev, u64 mask) > return 1; > } > > +static int dma_noop_mmap(struct device *dev, struct vm_area_struct *vma, > + void *cpu_addr, dma_addr_t dma_addr, size_t size, > + unsigned long attrs) > +{ > + unsigned long user_count = vma_pages(vma); > + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; > + unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); > + unsigned long off = vma->vm_pgoff; > + int ret = -ENXIO; > + > + if (off < count && user_count <= (count - off)) { > + ret = remap_pfn_range(vma, vma->vm_start, > + pfn + off, > + user_count << PAGE_SHIFT, > + vma->vm_page_prot); > + } > + > + return ret; > +} > + > struct dma_map_ops dma_noop_ops = { > .alloc = dma_noop_alloc, > .free = dma_noop_free, > @@ -73,6 +93,7 @@ struct dma_map_ops dma_noop_ops = { > .map_sg = dma_noop_map_sg, > .mapping_error = dma_noop_mapping_error, > .dma_supported = dma_noop_supported, > + .mmap = dma_noop_mmap, > }; > > EXPORT_SYMBOL(dma_noop_ops); > -- 2.0.0 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >
diff --git a/lib/dma-noop.c b/lib/dma-noop.c index a14eee5..70504eb 100644 --- a/lib/dma-noop.c +++ b/lib/dma-noop.c @@ -66,6 +66,26 @@ static int dma_noop_supported(struct device *dev, u64 mask) return 1; } +static int dma_noop_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs) +{ + unsigned long user_count = vma_pages(vma); + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); + unsigned long off = vma->vm_pgoff; + int ret = -ENXIO; + + if (off < count && user_count <= (count - off)) { + ret = remap_pfn_range(vma, vma->vm_start, + pfn + off, + user_count << PAGE_SHIFT, + vma->vm_page_prot); + } + + return ret; +} + struct dma_map_ops dma_noop_ops = { .alloc = dma_noop_alloc, .free = dma_noop_free, @@ -73,6 +93,7 @@ struct dma_map_ops dma_noop_ops = { .map_sg = dma_noop_map_sg, .mapping_error = dma_noop_mapping_error, .dma_supported = dma_noop_supported, + .mmap = dma_noop_mmap, }; EXPORT_SYMBOL(dma_noop_ops);