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dma-buf: remove kmap_atomic interface 

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

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/226645/
This commit is contained in:
Christian König 2018-05-28 13:34:01 +02:00 committed by Christian König
parent a19741e5e5
commit f664a52695
17 changed files with 2 additions and 165 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/dma-buf/dma-buf.c
View File

@ -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);
@ -687,26 +686,14 @@ 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).
* Implementing the functions is optional for exporters and for importers all
* the restrictions of using kmap apply.
*
* dma_buf kmap calls outside of the range specified in begin_cpu_access are
* undefined. If the range is not PAGE_SIZE aligned, kmap needs to succeed on
* the partial chunks at the beginning and end but may return stale or bogus
* data outside of the range (in these partial chunks).
*
* Note that these calls need to always succeed. The exporter needs to
* complete any preparations that might fail in begin_cpu_access.
*
* For some cases the overhead of kmap can be too high, a vmap interface
* is introduced. This interface should be used very carefully, as vmalloc
* space is a limited resources on many architectures.
@ -859,43 +846,6 @@ 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);
if (!dmabuf->ops->map_atomic)
return NULL;
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.

2
drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
View File

@ -238,9 +238,7 @@ 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,

2
drivers/gpu/drm/armada/armada_gem.c
View File

@ -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,

31
drivers/gpu/drm/drm_prime.c
View File

@ -433,35 +433,6 @@ 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
* @dma_buf: buffer to be mapped
* @page_num: page number within the buffer
*
* 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
* @dma_buf: buffer to be unmapped
* @page_num: page number within the buffer
* @addr: virtual address of the buffer
*
* 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
* @dma_buf: buffer to be mapped
@ -519,9 +490,7 @@ 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,

11
drivers/gpu/drm/i915/i915_gem_dmabuf.c
View File

@ -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,

2
drivers/gpu/drm/i915/selftests/mock_dmabuf.c
View File

@ -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,

2
drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
View File

@ -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,

14
drivers/gpu/drm/tegra/gem.c
View File

@ -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,

17
drivers/gpu/drm/udl/udl_dmabuf.c
View File

@ -157,27 +157,12 @@ 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)
{
@ -192,9 +177,7 @@ 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,
};

13
drivers/gpu/drm/vmwgfx/vmwgfx_prime.c
View File

@ -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,

1
drivers/media/common/videobuf2/videobuf2-dma-contig.c
View File

@ -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,

1
drivers/media/common/videobuf2/videobuf2-dma-sg.c
View File

@ -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,

1
drivers/media/common/videobuf2/videobuf2-vmalloc.c
View File

@ -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,

2
drivers/staging/android/ion/ion.c
View File

@ -369,8 +369,6 @@ 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,
};

6
drivers/tee/tee_shm.c
View File

@ -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,
};

4
include/drm/drm_prime.h
View File

@ -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);

4
include/linux/dma-buf.h
View File

@ -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 *);