linux-stable.git/drivers/gpu/drm/tegra/gem.c, branch linux-4.6.y

dma, mm/pat: Rename dma__writecombine() to dma__wc()

2016-03-09T13:57:51+00:00

Rename dma_*_writecombine() to dma_*_wc(), so that the naming
is coherent across the various write-combining APIs. Keep the
old names for compatibility for a while, these can be removed
at a later time. A guard is left to enable backporting of the
rename, and later remove of the old mapping defines seemlessly.

Build tested successfully with allmodconfig.

The following Coccinelle SmPL patch was used for this simple
transformation:

@ rename_dma_alloc_writecombine @
expression dev, size, dma_addr, gfp;
@@

-dma_alloc_writecombine(dev, size, dma_addr, gfp)
+dma_alloc_wc(dev, size, dma_addr, gfp)

@ rename_dma_free_writecombine @
expression dev, size, cpu_addr, dma_addr;
@@

-dma_free_writecombine(dev, size, cpu_addr, dma_addr)
+dma_free_wc(dev, size, cpu_addr, dma_addr)

@ rename_dma_mmap_writecombine @
expression dev, vma, cpu_addr, dma_addr, size;
@@

-dma_mmap_writecombine(dev, vma, cpu_addr, dma_addr, size)
+dma_mmap_wc(dev, vma, cpu_addr, dma_addr, size)

We also keep the old names as compatibility helpers, and
guard against their definition to make backporting easier.

Generated-by: Coccinelle SmPL
Suggested-by: Ingo Molnar 
Signed-off-by: Luis R. Rodriguez 
Cc: Linus Torvalds 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: airlied@linux.ie
Cc: akpm@linux-foundation.org
Cc: benh@kernel.crashing.org
Cc: bhelgaas@google.com
Cc: bp@suse.de
Cc: dan.j.williams@intel.com
Cc: daniel.vetter@ffwll.ch
Cc: dhowells@redhat.com
Cc: julia.lawall@lip6.fr
Cc: konrad.wilk@oracle.com
Cc: linux-fbdev@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: luto@amacapital.net
Cc: mst@redhat.com
Cc: tomi.valkeinen@ti.com
Cc: toshi.kani@hp.com
Cc: vinod.koul@intel.com
Cc: xen-devel@lists.xensource.com
Link: http://lkml.kernel.org/r/1453516462-4844-1-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Ingo Molnar

drm/tegra: Use drm_gem_object_unreference_unlocked()

2015-12-14T09:50:37+00:00

This only grabs the mutex when really needed, but still has a might-
acquire lockdep check to make sure that's always possible. With this
patch Tegra DRM is officially struct_mutex free, yay!

v2: refernce_unlocked doesn't exist as kbuild spotted.

Cc: Thierry Reding 
Acked-by: Thierry Reding 
Signed-off-by: Daniel Vetter 
[treding@nvidia.com: remove unused variables]
Signed-off-by: Thierry Reding

drm/tegra: Don't take dev->struct_mutex in mmap offset ioctl

2015-12-14T09:50:36+00:00

Since David Herrmann's mmap vma manager rework we don't need to grab
dev->struct_mutex any more to prevent races when looking up the mmap
offset. Drop it and instead don't forget to use the unref_unlocked
variant (since the drm core still cares).

v2: Finally get rid of the copypasta from another commit in this
commit message. And convert to _unlocked like we need to (Patrik).

Cc: Patrik Jakobsson 
Cc: Thierry Reding 
Acked-by: Thierry Reding 
Reviewed-by: Patrik Jakobsson 
Signed-off-by: Daniel Vetter 
Signed-off-by: Thierry Reding

drm/tegra: gem: Flush pages after allocation

2015-06-12T14:25:40+00:00

Pages allocated from shmemfs don't end up being cleared and flushed on
ARMv7, so they must be flushed explicitly. Use the DMA mapping API for
that purpose, even though it's not used for anything else.

Signed-off-by: Thierry Reding

dma-buf: cleanup dma_buf_export() to make it easily extensible

2015-04-21T09:17:16+00:00

At present, dma_buf_export() takes a series of parameters, which
makes it difficult to add any new parameters for exporters, if required.

Make it simpler by moving all these parameters into a struct, and pass
the struct * as parameter to dma_buf_export().

While at it, unite dma_buf_export_named() with dma_buf_export(), and
change all callers accordingly.

Reviewed-by: Maarten Lankhorst 
Reviewed-by: Daniel Thompson 
Acked-by: Mauro Carvalho Chehab 
Acked-by: Dave Airlie 
Signed-off-by: Sumit Semwal

drm/tegra: gem: oops in error handling

2015-01-27T09:14:41+00:00

kfree(ERR_PTR(-ENOMEM)) will not work very well.

Signed-off-by: Dan Carpenter 
Signed-off-by: Thierry Reding

drm/tegra: gem: Use iommu_map_sg()

2015-01-27T09:14:34+00:00

The iommu_map_sg() function is now available in the IOMMU API, so drop
the open-coded variant.

Signed-off-by: Thierry Reding

drm/tegra: gem: Use the proper size for GEM objects

2014-12-17T13:27:38+00:00

If the requested buffer size wasn't a multiple of the page size, the
IOMMU code would round down the size to the next multiple of the page
size, thereby causing translation errors. To fix this we no longer pass
around the requested size but reuse the computed size of the GEM object.
This is already rounded to the next page boundary, so mapping that size
works out fine.

Signed-off-by: Thierry Reding

drm/tegra: gem: Flush buffer objects upon allocation

2014-12-17T13:27:37+00:00

Buffers obtained via shmem may still have associated cachelines. If they
aren't properly flushed they may cause framebuffer corruption if the
cache gets flushed after the application has drawn to it.

Signed-off-by: Thierry Reding

drm/tegra: gem: Check before freeing CMA memory

2014-11-13T15:18:34+00:00

dma_free_writecombine() must not be called on a buffer that couldn't be
allocated. Check for a valid virtual address before attempting to free
the memory to avoid a crash.

Reported-by: Sean Paul 
Reviewed-by: Sean Paul 
Signed-off-by: Thierry Reding