Re: [Linaro-mm-sig] [PATCH 2/5] dma-buf: remove kmap_atomic interface

Am 20.06.2018 um 08:10 schrieb Sumit Semwal:

Hi Christian, On Tue, 19 Jun 2018 at 20:17, Christian König christian.koenig@amd.com wrote:

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Am 18.06.2018 um 10:18 schrieb Daniel Vetter:

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On Fri, Jun 01, 2018 at 02:00:17PM +0200, Christian König wrote:

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Neither used nor correctly implemented anywhere. Just completely remove the interface.

Signed-off-by: Christian König christian.koenig@amd.com

I wonder whether we can nuke the normal kmap stuff too ... everyone seems to want/use the vmap stuff for kernel-internal mapping needs.

Anyway, this looks good.

Hope am not too late (was out of office for some time) - this looks ok to me, please feel free to add my Acked-by: Sumit Semwal sumit.semwal@linaro.org

No, you're not to late. I was actually holding back a bit because of missing Ack's.

Thanks for the response, Christian.

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---

drivers/dma-buf/dma-buf.c | 44 ---------------------- drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 2 - drivers/gpu/drm/armada/armada_gem.c | 2 - drivers/gpu/drm/drm_prime.c | 26 ------------- drivers/gpu/drm/i915/i915_gem_dmabuf.c | 11 ------ drivers/gpu/drm/i915/selftests/mock_dmabuf.c | 2 - drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 2 - drivers/gpu/drm/tegra/gem.c | 14 ------- drivers/gpu/drm/udl/udl_dmabuf.c | 17 --------- drivers/gpu/drm/vmwgfx/vmwgfx_prime.c | 13 ------- .../media/common/videobuf2/videobuf2-dma-contig.c | 1 - drivers/media/common/videobuf2/videobuf2-dma-sg.c | 1 - drivers/media/common/videobuf2/videobuf2-vmalloc.c | 1 - drivers/staging/android/ion/ion.c | 2 - drivers/tee/tee_shm.c | 6 --- include/drm/drm_prime.h | 4 -- include/linux/dma-buf.h | 4 -- 17 files changed, 152 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index e99a8d19991b..e4c657d9fad7 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -405,7 +405,6 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) || !exp_info->ops->map_dma_buf || !exp_info->ops->unmap_dma_buf || !exp_info->ops->release

•                  || !exp_info->ops->map_atomic
                    || !exp_info->ops->map
                    || !exp_info->ops->mmap)) {
          return ERR_PTR(-EINVAL);
  

@@ -687,14 +686,6 @@ EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); * void *dma_buf_kmap(struct dma_buf *, unsigned long); * void dma_buf_kunmap(struct dma_buf *, unsigned long, void *); *

• • There are also atomic variants of these interfaces. Like for kmap they
• • facilitate non-blocking fast-paths. Neither the importer nor the exporter
• • (in the callback) is allowed to block when using these.
• • Interfaces::

• •  void \*dma_buf_kmap_atomic(struct dma_buf \*, unsigned long);
    

• •  void dma_buf_kunmap_atomic(struct dma_buf \*, unsigned long, void \*);
    

• • • For importers all the restrictions of using kmap apply, like the limited
    • supply of kmap_atomic slots. Hence an importer shall only hold onto at
    • max 2 atomic dma_buf kmaps at the same time (in any given process context).

This is also about atomic kmap ...

And the subsequent language around "Note that these calls need to always succeed." is also not true, might be good to update that stating that kmap is optional (like we say already for vmap).

With those docs nits addressed:

Reviewed-by: Daniel Vetter daniel.vetter@ffwll.ch

I've fixed up patch #1 and #2 and added your Reviewed-by tag.

Since I finally had time to install dim do you have any objections that I now run "dim push drm-misc-next" with those two applied?

Regards, Christian.

...

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@@ -859,41 +850,6 @@ int dma_buf_end_cpu_access(struct dma_buf *dmabuf, } EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);

-/**

• • dma_buf_kmap_atomic - Map a page of the buffer object into kernel address
• • space. The same restrictions as for kmap_atomic and friends apply.
• • @dmabuf: [in] buffer to map page from.
• • @page_num: [in] page in PAGE_SIZE units to map.
• • This call must always succeed, any necessary preparations that might fail
• • need to be done in begin_cpu_access.
• */

-void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) -{

• WARN_ON(!dmabuf);
• return dmabuf->ops->map_atomic(dmabuf, page_num);

-} -EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic);

-/**

• • dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic.
• • @dmabuf: [in] buffer to unmap page from.
• • @page_num: [in] page in PAGE_SIZE units to unmap.
• • @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic.
• • This call must always succeed.
• */

-void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num,

•                   void *vaddr)
  

-{

• WARN_ON(!dmabuf);
• if (dmabuf->ops->unmap_atomic)

•        dmabuf->ops->unmap_atomic(dmabuf, page_num, vaddr);
  

-} -EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic);

• /**
  • dma_buf_kmap - Map a page of the buffer object into kernel address space. The
  • same restrictions as for kmap and friends apply.

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c index f1500f1ec0f5..a156b3891a3f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c @@ -244,9 +244,7 @@ static const struct dma_buf_ops amdgpu_dmabuf_ops = { .release = drm_gem_dmabuf_release, .begin_cpu_access = amdgpu_gem_begin_cpu_access, .map = drm_gem_dmabuf_kmap,

• .map_atomic = drm_gem_dmabuf_kmap_atomic, .unmap = drm_gem_dmabuf_kunmap,
• .unmap_atomic = drm_gem_dmabuf_kunmap_atomic, .mmap = drm_gem_dmabuf_mmap, .vmap = drm_gem_dmabuf_vmap, .vunmap = drm_gem_dmabuf_vunmap,

diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c index a97f509743a5..3fb37c75c065 100644 --- a/drivers/gpu/drm/armada/armada_gem.c +++ b/drivers/gpu/drm/armada/armada_gem.c @@ -490,8 +490,6 @@ static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = { .map_dma_buf = armada_gem_prime_map_dma_buf, .unmap_dma_buf = armada_gem_prime_unmap_dma_buf, .release = drm_gem_dmabuf_release,

• .map_atomic = armada_gem_dmabuf_no_kmap,
• .unmap_atomic = armada_gem_dmabuf_no_kunmap, .map = armada_gem_dmabuf_no_kmap, .unmap = armada_gem_dmabuf_no_kunmap, .mmap = armada_gem_dmabuf_mmap,

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 4a3a232fea67..b28fa8f44c8b 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -426,30 +426,6 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) } EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);

-/**

• • drm_gem_dmabuf_kmap_atomic - map_atomic implementation for GEM
• • Not implemented. This can be used as the &dma_buf_ops.map_atomic callback.
• */

-void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,

•                         unsigned long page_num)
  

-{

• return NULL;

-} -EXPORT_SYMBOL(drm_gem_dmabuf_kmap_atomic);

-/**

• • drm_gem_dmabuf_kunmap_atomic - unmap_atomic implementation for GEM
• • Not implemented. This can be used as the &dma_buf_ops.unmap_atomic callback.
• */

-void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,

•                          unsigned long page_num, void *addr)
  

-{

-} -EXPORT_SYMBOL(drm_gem_dmabuf_kunmap_atomic);

• /**
  • drm_gem_dmabuf_kmap - map implementation for GEM

@@ -502,9 +478,7 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops = { .unmap_dma_buf = drm_gem_unmap_dma_buf, .release = drm_gem_dmabuf_release, .map = drm_gem_dmabuf_kmap,

• .map_atomic = drm_gem_dmabuf_kmap_atomic, .unmap = drm_gem_dmabuf_kunmap,
• .unmap_atomic = drm_gem_dmabuf_kunmap_atomic, .mmap = drm_gem_dmabuf_mmap, .vmap = drm_gem_dmabuf_vmap, .vunmap = drm_gem_dmabuf_vunmap,

diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c index 69a7aec49e84..82e2ca17a441 100644 --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c @@ -111,15 +111,6 @@ static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) i915_gem_object_unpin_map(obj); }

-static void *i915_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) -{

• return NULL;

-}

-static void i915_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) -{

-} static void *i915_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) { struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf); @@ -225,9 +216,7 @@ static const struct dma_buf_ops i915_dmabuf_ops = { .unmap_dma_buf = i915_gem_unmap_dma_buf, .release = drm_gem_dmabuf_release, .map = i915_gem_dmabuf_kmap,

• .map_atomic = i915_gem_dmabuf_kmap_atomic, .unmap = i915_gem_dmabuf_kunmap,
• .unmap_atomic = i915_gem_dmabuf_kunmap_atomic, .mmap = i915_gem_dmabuf_mmap, .vmap = i915_gem_dmabuf_vmap, .vunmap = i915_gem_dmabuf_vunmap,

diff --git a/drivers/gpu/drm/i915/selftests/mock_dmabuf.c b/drivers/gpu/drm/i915/selftests/mock_dmabuf.c index 302f7d103635..f81fda8ea45e 100644 --- a/drivers/gpu/drm/i915/selftests/mock_dmabuf.c +++ b/drivers/gpu/drm/i915/selftests/mock_dmabuf.c @@ -130,9 +130,7 @@ static const struct dma_buf_ops mock_dmabuf_ops = { .unmap_dma_buf = mock_unmap_dma_buf, .release = mock_dmabuf_release, .map = mock_dmabuf_kmap,

• .map_atomic = mock_dmabuf_kmap_atomic, .unmap = mock_dmabuf_kunmap,
• .unmap_atomic = mock_dmabuf_kunmap_atomic, .mmap = mock_dmabuf_mmap, .vmap = mock_dmabuf_vmap, .vunmap = mock_dmabuf_vunmap,

diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c index 8e41d649e248..1a073f9b2834 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c @@ -148,8 +148,6 @@ static const struct dma_buf_ops omap_dmabuf_ops = { .release = drm_gem_dmabuf_release, .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access, .end_cpu_access = omap_gem_dmabuf_end_cpu_access,

• .map_atomic = omap_gem_dmabuf_kmap_atomic,
• .unmap_atomic = omap_gem_dmabuf_kunmap_atomic, .map = omap_gem_dmabuf_kmap, .unmap = omap_gem_dmabuf_kunmap, .mmap = omap_gem_dmabuf_mmap,

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index 8b0b4ff64bb4..d7661702c11c 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -596,18 +596,6 @@ static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, return 0; }

-static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,

•                                 unsigned long page)
  

-{

• return NULL;

-}

-static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf,

•                                  unsigned long page,
  

•                                  void *addr)
  

-{ -}

• static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page) { return NULL;

@@ -648,8 +636,6 @@ static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { .release = tegra_gem_prime_release, .begin_cpu_access = tegra_gem_prime_begin_cpu_access, .end_cpu_access = tegra_gem_prime_end_cpu_access,

• .map_atomic = tegra_gem_prime_kmap_atomic,
• .unmap_atomic = tegra_gem_prime_kunmap_atomic, .map = tegra_gem_prime_kmap, .unmap = tegra_gem_prime_kunmap, .mmap = tegra_gem_prime_mmap,

diff --git a/drivers/gpu/drm/udl/udl_dmabuf.c b/drivers/gpu/drm/udl/udl_dmabuf.c index 5fdc8bdc2026..ae7225dedc30 100644 --- a/drivers/gpu/drm/udl/udl_dmabuf.c +++ b/drivers/gpu/drm/udl/udl_dmabuf.c @@ -156,27 +156,12 @@ static void *udl_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) return NULL; }

-static void *udl_dmabuf_kmap_atomic(struct dma_buf *dma_buf,

•                            unsigned long page_num)
  

-{

• /* TODO */
• return NULL;

-}

• static void udl_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) { /* TODO */ }

-static void udl_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,

•                             unsigned long page_num,
  

•                             void *addr)
  

-{

• /* TODO */

-}

• static int udl_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) {

@@ -191,9 +176,7 @@ static const struct dma_buf_ops udl_dmabuf_ops = { .map_dma_buf = udl_map_dma_buf, .unmap_dma_buf = udl_unmap_dma_buf, .map = udl_dmabuf_kmap,

• .map_atomic = udl_dmabuf_kmap_atomic, .unmap = udl_dmabuf_kunmap,
• .unmap_atomic = udl_dmabuf_kunmap_atomic, .mmap = udl_dmabuf_mmap, .release = drm_gem_dmabuf_release, };

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c b/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c index fbffb37ccf42..373bc6da2f84 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c @@ -71,17 +71,6 @@ static void vmw_prime_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr) { }

-static void *vmw_prime_dmabuf_kmap_atomic(struct dma_buf *dma_buf,

•        unsigned long page_num)
  

-{

• return NULL;

-}

-static void vmw_prime_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,

•        unsigned long page_num, void *addr)
  

-{

-} static void *vmw_prime_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num) { @@ -108,9 +97,7 @@ const struct dma_buf_ops vmw_prime_dmabuf_ops = { .unmap_dma_buf = vmw_prime_unmap_dma_buf, .release = NULL, .map = vmw_prime_dmabuf_kmap,

• .map_atomic = vmw_prime_dmabuf_kmap_atomic, .unmap = vmw_prime_dmabuf_kunmap,
• .unmap_atomic = vmw_prime_dmabuf_kunmap_atomic, .mmap = vmw_prime_dmabuf_mmap, .vmap = vmw_prime_dmabuf_vmap, .vunmap = vmw_prime_dmabuf_vunmap,

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c index 12d0072c52c2..aff0ab7bf83d 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -358,7 +358,6 @@ static const struct dma_buf_ops vb2_dc_dmabuf_ops = { .map_dma_buf = vb2_dc_dmabuf_ops_map, .unmap_dma_buf = vb2_dc_dmabuf_ops_unmap, .map = vb2_dc_dmabuf_ops_kmap,

• .map_atomic = vb2_dc_dmabuf_ops_kmap, .vmap = vb2_dc_dmabuf_ops_vmap, .mmap = vb2_dc_dmabuf_ops_mmap, .release = vb2_dc_dmabuf_ops_release,

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c index cf94765e593f..015e737095cd 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c @@ -507,7 +507,6 @@ static const struct dma_buf_ops vb2_dma_sg_dmabuf_ops = { .map_dma_buf = vb2_dma_sg_dmabuf_ops_map, .unmap_dma_buf = vb2_dma_sg_dmabuf_ops_unmap, .map = vb2_dma_sg_dmabuf_ops_kmap,

• .map_atomic = vb2_dma_sg_dmabuf_ops_kmap, .vmap = vb2_dma_sg_dmabuf_ops_vmap, .mmap = vb2_dma_sg_dmabuf_ops_mmap, .release = vb2_dma_sg_dmabuf_ops_release,

diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c index 298ffb9ecdae..467a4005164b 100644 --- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c +++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c @@ -346,7 +346,6 @@ static const struct dma_buf_ops vb2_vmalloc_dmabuf_ops = { .map_dma_buf = vb2_vmalloc_dmabuf_ops_map, .unmap_dma_buf = vb2_vmalloc_dmabuf_ops_unmap, .map = vb2_vmalloc_dmabuf_ops_kmap,

• .map_atomic = vb2_vmalloc_dmabuf_ops_kmap, .vmap = vb2_vmalloc_dmabuf_ops_vmap, .mmap = vb2_vmalloc_dmabuf_ops_mmap, .release = vb2_vmalloc_dmabuf_ops_release,

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index 57e0d8035b2e..a46219ff5e16 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -374,8 +374,6 @@ static const struct dma_buf_ops dma_buf_ops = { .detach = ion_dma_buf_detatch, .begin_cpu_access = ion_dma_buf_begin_cpu_access, .end_cpu_access = ion_dma_buf_end_cpu_access,

• .map_atomic = ion_dma_buf_kmap,
• .unmap_atomic = ion_dma_buf_kunmap, .map = ion_dma_buf_kmap, .unmap = ion_dma_buf_kunmap, };

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 556960a1bab3..df4a1553b78b 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -80,11 +80,6 @@ static void tee_shm_op_release(struct dma_buf *dmabuf) tee_shm_release(shm); }

-static void *tee_shm_op_map_atomic(struct dma_buf *dmabuf, unsigned long pgnum) -{

• return NULL;

-}

• static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum) { return NULL;

@@ -107,7 +102,6 @@ static const struct dma_buf_ops tee_shm_dma_buf_ops = { .map_dma_buf = tee_shm_op_map_dma_buf, .unmap_dma_buf = tee_shm_op_unmap_dma_buf, .release = tee_shm_op_release,

• .map_atomic = tee_shm_op_map_atomic, .map = tee_shm_op_map, .mmap = tee_shm_op_mmap, };

diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h index ef338151cea8..d716d653b096 100644 --- a/include/drm/drm_prime.h +++ b/include/drm/drm_prime.h @@ -93,10 +93,6 @@ void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, enum dma_data_direction dir); void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf); void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr); -void *drm_gem_dmabuf_kmap_atomic(struct dma_buf *dma_buf,

•                         unsigned long page_num);
  

-void drm_gem_dmabuf_kunmap_atomic(struct dma_buf *dma_buf,

•                          unsigned long page_num, void *addr);
  

  void *drm_gem_dmabuf_kmap(struct dma_buf *dma_buf, unsigned long page_num); void drm_gem_dmabuf_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr);

diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 346caf77937f..d17cadd76802 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -205,8 +205,6 @@ struct dma_buf_ops { * to be restarted. */ int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);

• void *(*map_atomic)(struct dma_buf *, unsigned long);
• void (*unmap_atomic)(struct dma_buf *, unsigned long, void *); void *(*map)(struct dma_buf *, unsigned long); void (*unmap)(struct dma_buf *, unsigned long, void *);

@@ -394,8 +392,6 @@ int dma_buf_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction dir); int dma_buf_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction dir); -void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long); -void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *); void *dma_buf_kmap(struct dma_buf *, unsigned long); void dma_buf_kunmap(struct dma_buf *, unsigned long, void *);

-- 2.14.1

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