| Message ID | 20211210232404.4098157-2-ira.weiny@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | DRM kmap() fixes and kmap_local_page() conversions | expand |
On Fri, Dec 10, 2021 at 03:23:58PM -0800, ira.weiny@intel.com wrote: > From: Ira Weiny <ira.weiny@intel.com> > > kmap() is being deprecated and these usages are all local to the thread > so there is no reason kmap_local_page() can't be used. > > Replace kmap() calls with kmap_local_page(). > > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > --- > drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 4 ++-- > drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c | 8 ++++---- > drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c | 4 ++-- > drivers/gpu/drm/i915/gt/shmem_utils.c | 4 ++-- > drivers/gpu/drm/i915/i915_gem.c | 8 ++++---- > drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++-- > 6 files changed, 16 insertions(+), 16 deletions(-) > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c > index d77da59fae04..fa8b820e14aa 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c > @@ -597,9 +597,9 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv, > if (err < 0) > goto fail; > > - vaddr = kmap(page); > + vaddr = kmap_local_page(page); > memcpy(vaddr, data, len); > - kunmap(page); > + kunmap_local(vaddr); > > err = pagecache_write_end(file, file->f_mapping, > offset, len, len, > diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c > index 6d30cdfa80f3..e59e1725e29d 100644 > --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c > +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c > @@ -144,7 +144,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj, > intel_gt_flush_ggtt_writes(&to_i915(obj->base.dev)->gt); > > p = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT); > - cpu = kmap(p) + offset_in_page(offset); > + cpu = kmap_local_page(p) + offset_in_page(offset); Does kunmap_local() do some magic to make it work even when you don't pass in the same value you got from kmap_local_page()? > drm_clflush_virt_range(cpu, sizeof(*cpu)); > if (*cpu != (u32)page) { > pr_err("Partial view for %lu [%u] (offset=%llu, size=%u [%llu, row size %u], fence=%d, tiling=%d, stride=%d) misalignment, expected write to page (%llu + %u [0x%llx]) of 0x%x, found 0x%x\n", > @@ -162,7 +162,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj, > } > *cpu = 0; > drm_clflush_virt_range(cpu, sizeof(*cpu)); > - kunmap(p); > + kunmap_local(cpu); > > out: > __i915_vma_put(vma);
On Mon, Dec 13, 2021 at 02:39:59PM +0200, Ville Syrjälä wrote: > On Fri, Dec 10, 2021 at 03:23:58PM -0800, ira.weiny@intel.com wrote: > > From: Ira Weiny <ira.weiny@intel.com> > > > > kmap() is being deprecated and these usages are all local to the thread > > so there is no reason kmap_local_page() can't be used. > > > > Replace kmap() calls with kmap_local_page(). > > > > Signed-off-by: Ira Weiny <ira.weiny@intel.com> > > --- > > drivers/gpu/drm/i915/gem/i915_gem_shmem.c | 4 ++-- > > drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c | 8 ++++---- > > drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c | 4 ++-- > > drivers/gpu/drm/i915/gt/shmem_utils.c | 4 ++-- > > drivers/gpu/drm/i915/i915_gem.c | 8 ++++---- > > drivers/gpu/drm/i915/i915_gpu_error.c | 4 ++-- > > 6 files changed, 16 insertions(+), 16 deletions(-) > > > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c > > index d77da59fae04..fa8b820e14aa 100644 > > --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c > > +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c > > @@ -597,9 +597,9 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv, > > if (err < 0) > > goto fail; > > > > - vaddr = kmap(page); > > + vaddr = kmap_local_page(page); > > memcpy(vaddr, data, len); > > - kunmap(page); > > + kunmap_local(vaddr); > > > > err = pagecache_write_end(file, file->f_mapping, > > offset, len, len, > > diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c > > index 6d30cdfa80f3..e59e1725e29d 100644 > > --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c > > +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c > > @@ -144,7 +144,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj, > > intel_gt_flush_ggtt_writes(&to_i915(obj->base.dev)->gt); > > > > p = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT); > > - cpu = kmap(p) + offset_in_page(offset); > > + cpu = kmap_local_page(p) + offset_in_page(offset); > > Does kunmap_local() do some magic to make it work even when you > don't pass in the same value you got from kmap_local_page()? Yes. It sounds like a patch like this would be nice to clarify? Ira diff --git a/include/linux/highmem-internal.h b/include/linux/highmem-internal.h index 0a0b2b09b1b8..fb2d3e033c01 100644 --- a/include/linux/highmem-internal.h +++ b/include/linux/highmem-internal.h @@ -246,6 +246,17 @@ do { \ __kunmap_atomic(__addr); \ } while (0) +/** + * kunmap_local - Unmap a page mapped via kmap_local_page(). + * @__addr: An address within the page mapped + * + * __addr is often an address returned from kmap_local_page(). However, + * this address can be any address within the mapped page. It does not need to + * be the exact address returned from kmap_local_page() + * + * Unmapping should be done in the reverse order of the mapping. See + * kmap_local_page() for details. + */ #define kunmap_local(__addr) \ do { \ BUILD_BUG_ON(__same_type((__addr), struct page *)); \
On Mon, Dec 13, 2021 at 01:04:07AM -0800, Christoph Hellwig wrote: > On Fri, Dec 10, 2021 at 03:23:58PM -0800, ira.weiny@intel.com wrote: > > - vaddr = kmap(page); > > + vaddr = kmap_local_page(page); > > memcpy(vaddr, data, len); > > - kunmap(page); > > + kunmap_local(vaddr); > > memcpy_to_page? Opps! Yea! David, Daniel, Do you prefer me to resent the entire series or reply to this message with a V2? Ira
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c index d77da59fae04..fa8b820e14aa 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c @@ -597,9 +597,9 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv, if (err < 0) goto fail; - vaddr = kmap(page); + vaddr = kmap_local_page(page); memcpy(vaddr, data, len); - kunmap(page); + kunmap_local(vaddr); err = pagecache_write_end(file, file->f_mapping, offset, len, len, diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c index 6d30cdfa80f3..e59e1725e29d 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c @@ -144,7 +144,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj, intel_gt_flush_ggtt_writes(&to_i915(obj->base.dev)->gt); p = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT); - cpu = kmap(p) + offset_in_page(offset); + cpu = kmap_local_page(p) + offset_in_page(offset); drm_clflush_virt_range(cpu, sizeof(*cpu)); if (*cpu != (u32)page) { pr_err("Partial view for %lu [%u] (offset=%llu, size=%u [%llu, row size %u], fence=%d, tiling=%d, stride=%d) misalignment, expected write to page (%llu + %u [0x%llx]) of 0x%x, found 0x%x\n", @@ -162,7 +162,7 @@ static int check_partial_mapping(struct drm_i915_gem_object *obj, } *cpu = 0; drm_clflush_virt_range(cpu, sizeof(*cpu)); - kunmap(p); + kunmap_local(cpu); out: __i915_vma_put(vma); @@ -237,7 +237,7 @@ static int check_partial_mappings(struct drm_i915_gem_object *obj, intel_gt_flush_ggtt_writes(&to_i915(obj->base.dev)->gt); p = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT); - cpu = kmap(p) + offset_in_page(offset); + cpu = kmap_local_page(p) + offset_in_page(offset); drm_clflush_virt_range(cpu, sizeof(*cpu)); if (*cpu != (u32)page) { pr_err("Partial view for %lu [%u] (offset=%llu, size=%u [%llu, row size %u], fence=%d, tiling=%d, stride=%d) misalignment, expected write to page (%llu + %u [0x%llx]) of 0x%x, found 0x%x\n", @@ -255,7 +255,7 @@ static int check_partial_mappings(struct drm_i915_gem_object *obj, } *cpu = 0; drm_clflush_virt_range(cpu, sizeof(*cpu)); - kunmap(p); + kunmap_local(cpu); if (err) return err; diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c b/drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c index f8948de72036..743a414f86f3 100644 --- a/drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c +++ b/drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c @@ -743,7 +743,7 @@ static void swizzle_page(struct page *page) char *vaddr; int i; - vaddr = kmap(page); + vaddr = kmap_local_page(page); for (i = 0; i < PAGE_SIZE; i += 128) { memcpy(temp, &vaddr[i], 64); @@ -751,7 +751,7 @@ static void swizzle_page(struct page *page) memcpy(&vaddr[i + 64], temp, 64); } - kunmap(page); + kunmap_local(vaddr); } /** diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c index 0683b27a3890..cba4f210d093 100644 --- a/drivers/gpu/drm/i915/gt/shmem_utils.c +++ b/drivers/gpu/drm/i915/gt/shmem_utils.c @@ -104,7 +104,7 @@ static int __shmem_rw(struct file *file, loff_t off, if (IS_ERR(page)) return PTR_ERR(page); - vaddr = kmap(page); + vaddr = kmap_local_page(page); if (write) { memcpy(vaddr + offset_in_page(off), ptr, this); set_page_dirty(page); @@ -112,7 +112,7 @@ static int __shmem_rw(struct file *file, loff_t off, memcpy(ptr, vaddr + offset_in_page(off), this); } mark_page_accessed(page); - kunmap(page); + kunmap_local(vaddr); put_page(page); len -= this; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 981e383d1a5d..af5adb187ca4 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -196,14 +196,14 @@ shmem_pread(struct page *page, int offset, int len, char __user *user_data, char *vaddr; int ret; - vaddr = kmap(page); + vaddr = kmap_local_page(page); if (needs_clflush) drm_clflush_virt_range(vaddr + offset, len); ret = __copy_to_user(user_data, vaddr + offset, len); - kunmap(page); + kunmap_local(vaddr); return ret ? -EFAULT : 0; } @@ -618,7 +618,7 @@ shmem_pwrite(struct page *page, int offset, int len, char __user *user_data, char *vaddr; int ret; - vaddr = kmap(page); + vaddr = kmap_local_page(page); if (needs_clflush_before) drm_clflush_virt_range(vaddr + offset, len); @@ -627,7 +627,7 @@ shmem_pwrite(struct page *page, int offset, int len, char __user *user_data, if (!ret && needs_clflush_after) drm_clflush_virt_range(vaddr + offset, len); - kunmap(page); + kunmap_local(vaddr); return ret ? -EFAULT : 0; } diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 2a2d7643b551..c526d7892081 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -1094,9 +1094,9 @@ i915_vma_coredump_create(const struct intel_gt *gt, drm_clflush_pages(&page, 1); - s = kmap(page); + s = kmap_local_page(page); ret = compress_page(compress, s, dst, false); - kunmap(page); + kunmap_local(s); drm_clflush_pages(&page, 1);