This API is the equivalent of alloc_pages, except that the returned memory
is guaranteed to be DMA addressable by the passed in device. The
implementation will also be used to provide a more sensible replacement
for DMA_ATTR_NON_CONSISTENT flag.
Additionally dma_alloc_noncoherent is switched
DMA_ATTR_NON_CONSISTENT is a no-op except on PARISC and some mips
configs, so don't set it in this ARM specific driver part.
Signed-off-by: Christoph Hellwig
---
drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git
Use the new non-coherent DMA API including proper ownership transfers.
This includes adding additional calls to dma_sync_desc_dev as the
old syncing was rather ad-hoc.
Thanks to Thomas Bogendoerfer for debugging the ownership transfer
issues.
Signed-off-by: Christoph Hellwig
---
On Mon, 2020-09-14 at 16:44 +0200, Christoph Hellwig wrote:
> @@ -429,7 +430,7 @@ struct NCR_700_Host_Parameters {
> for(i=0; i< (sizeof(A_##symbol##_used) / sizeof(__u32));
> i++) { \
> __u32 val =
> bS_to_cpu((script)[A_##symbol##_used[i]]) + da; \
>
Hi
Am 13.08.20 um 12:22 schrieb Christian König:
> Am 13.08.20 um 10:36 schrieb Thomas Zimmermann:
>> GEM object functions deprecate several similar callback interfaces in
>> struct drm_driver. This patch replaces the per-driver callbacks with
>> per-instance callbacks in amdgpu. The only
From: Sergey Senozhatsky
The patch partially reverts some of the UAPI bits of the buffer
cache management hints. Namely, the queue consistency (memory
coherency) user-space hint because, as it turned out, the kernel
implementation of this feature was misusing DMA_ATTR_NON_CONSISTENT.
The patch
This allows us to get rid of the LIB82596_DMA_ATTR defined and prepare
for untangling the coherent vs non-coherent DMA allocation API.
Signed-off-by: Christoph Hellwig
---
drivers/net/ethernet/i825xx/lasi_82596.c | 24 ++--
drivers/net/ethernet/i825xx/lib82596.c | 36
On Mon, Sep 14, 2020 at 04:44:16PM +0200, Christoph Hellwig wrote:
> I'm still a little unsure about the API naming, as alloc_pages sort of
> implies a struct page return value, but we return a kernel virtual
> address.
Erm ... dma_alloc_pages() returns a struct page, so is this sentence
stale?
Add a new API to allocate and free memory that is guaranteed to be
addressable by a device, but which potentially is not cache coherent
for DMA.
To transfer ownership to and from the device, the existing streaming
DMA API calls dma_sync_single_for_device and dma_sync_single_for_cpu
must be used.
Hi all,
this series replaced the DMA_ATTR_NON_CONSISTENT flag to dma_alloc_attrs
with a separate new dma_alloc_pages API, which is available on all
platforms. In addition to cleaning up the convoluted code path, this
ensures that other drivers that have asked for better support for
non-coherent
To prevent a compiler error when a method call alloc_pages is
added (which I plan to for the dma_map_ops).
Signed-off-by: Christoph Hellwig
---
include/linux/gfp.h | 6 --
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index
Use the new non-coherent DMA API including proper ownership transfers.
Signed-off-by: Christoph Hellwig
---
drivers/scsi/53c700.c | 11 +--
drivers/scsi/53c700.h | 16
2 files changed, 17 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/53c700.c
Implement the alloc_noncoherent method to provide memory that is neither
coherent not contiguous.
Signed-off-by: Christoph Hellwig
---
drivers/iommu/dma-iommu.c | 41 +++
1 file changed, 37 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c
Use the new non-coherent DMA API including proper ownership transfers.
This also means we can allocate the buffer memory with the proper
direction instead of bidirectional.
Signed-off-by: Christoph Hellwig
---
sound/mips/hal2.c | 58 ++-
1 file
Use the new non-coherent DMA API including proper ownership transfers.
This also means we can allocate the memory as DMA_TO_DEVICE instead
of bidirectional.
Signed-off-by: Christoph Hellwig
---
drivers/scsi/sgiwd93.c | 14 +++---
1 file changed, 7 insertions(+), 7 deletions(-)
diff
This will allow IOMMU drivers to allocate non-contigous memory and
return a vmapped virtual address.
Signed-off-by: Christoph Hellwig
---
include/linux/dma-mapping.h | 5 +
kernel/dma/mapping.c| 33 +++--
2 files changed, 32 insertions(+), 6 deletions(-)
On Mon, Sep 14, 2020 at 04:44:27PM +0200, Christoph Hellwig wrote:
> drivers/net/ethernet/i825xx/lasi_82596.c | 25 ++---
> drivers/net/ethernet/i825xx/lib82596.c | 114 ++-
> drivers/net/ethernet/i825xx/sni_82596.c | 4 -
> drivers/net/ethernet/seeq/sgiseeq.c | 28
DMA_ATTR_NON_CONSISTENT is a no-op except on PARISC and some mips
configs, so don't set it in this ARM specific driver.
Signed-off-by: Christoph Hellwig
---
drivers/gpu/drm/exynos/exynos_drm_gem.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c
All users are gone now, remove the API.
Signed-off-by: Christoph Hellwig
---
arch/mips/Kconfig | 1 -
arch/mips/jazz/jazzdma.c| 1 -
arch/mips/mm/dma-noncoherent.c | 6 --
arch/parisc/Kconfig | 1 -
arch/parisc/kernel/pci-dma.c| 6 --
The au1000-eth driver contains none of the manual cache synchronization
required for using DMA_ATTR_NON_CONSISTENT. From what I can tell it
can be used on both dma coherent and non-coherent DMA platforms, but
I suspect it has been buggy on the non-coherent platforms all along.
Signed-off-by:
On 9/14/20 5:44 PM, Christoph Hellwig wrote:
> DMA_ATTR_NON_CONSISTENT is a no-op except on PARISC and some mips
> configs, so don't set it in this ARM specific driver.
Hm, PARICS and ARM capitalized but mips in lower case? :-)
> Signed-off-by: Christoph Hellwig
[...]
MBR, Sergei
On Mon, Sep 14, 2020 at 3:45 PM Ralph Campbell wrote:
>
> ZONE_DEVICE struct pages have an extra reference count that complicates the
> code for put_page() and several places in the kernel that need to check the
> reference count to see that a page is not being used (gup, compaction,
> migration,
Am 14.09.20 um 17:05 schrieb Thomas Zimmermann:
Hi
Am 13.08.20 um 12:22 schrieb Christian König:
Am 13.08.20 um 10:36 schrieb Thomas Zimmermann:
GEM object functions deprecate several similar callback interfaces in
struct drm_driver. This patch replaces the per-driver callbacks with
ZONE_DEVICE struct pages have an extra reference count that complicates the
code for put_page() and several places in the kernel that need to check the
reference count to see that a page is not being used (gup, compaction,
migration, etc.). Clean up the code so the reference count doesn't need to
On Sun, Sep 13, 2020 at 5:01 PM Tomasz Kłoczko wrote:
>
>
> On Sun, 13 Sep 2020 at 20:35, Ilia Mirkin wrote:
>>
>> What hardware are you using?
>
>
> :18:00.0 VGA compatible controller: NVIDIA Corporation GP104GL [Quadro
> P4000] (rev a1)
There's no acceleration support for video decoding
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