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authorChristoph Hellwig <hch@lst.de>2021-04-29 22:57:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-04-30 11:20:39 -0700
commitb739f125e4ebd73d10ed30a856574e13649119ed (patch)
tree24b8964b444b404074a83ac14133902d83babdfa
parent1fbaf8fc12a0136c7e62e7ad6fe886fe1749912c (diff)
i915: use io_mapping_map_user
Replace the home-grown remap_io_mapping that abuses apply_to_page_range with the proper io_mapping_map_user interface. Link: https://lkml.kernel.org/r/20210326055505.1424432-4-hch@lst.de Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/gpu/drm/i915/Kconfig1
-rw-r--r--drivers/gpu/drm/i915/gem/i915_gem_mman.c9
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h3
-rw-r--r--drivers/gpu/drm/i915/i915_mm.c44
4 files changed, 5 insertions, 52 deletions
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig
index 369695df8b15..69f57ca9c68d 100644
--- a/drivers/gpu/drm/i915/Kconfig
+++ b/drivers/gpu/drm/i915/Kconfig
@@ -20,6 +20,7 @@ config DRM_I915
select INPUT if ACPI
select ACPI_VIDEO if ACPI
select ACPI_BUTTON if ACPI
+ select IO_MAPPING
select SYNC_FILE
select IOSF_MBI
select CRC32
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 2561a2f1e54f..23f6b00e08e2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -367,11 +367,10 @@ retry:
goto err_unpin;
/* Finally, remap it using the new GTT offset */
- ret = remap_io_mapping(area,
- area->vm_start + (vma->ggtt_view.partial.offset << PAGE_SHIFT),
- (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
- min_t(u64, vma->size, area->vm_end - area->vm_start),
- &ggtt->iomap);
+ ret = io_mapping_map_user(&ggtt->iomap, area, area->vm_start +
+ (vma->ggtt_view.partial.offset << PAGE_SHIFT),
+ (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
+ min_t(u64, vma->size, area->vm_end - area->vm_start));
if (ret)
goto err_fence;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 69e43bf91a15..9ec9277539ec 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1905,9 +1905,6 @@ int i915_reg_read_ioctl(struct drm_device *dev, void *data,
struct drm_file *file);
/* i915_mm.c */
-int remap_io_mapping(struct vm_area_struct *vma,
- unsigned long addr, unsigned long pfn, unsigned long size,
- struct io_mapping *iomap);
int remap_io_sg(struct vm_area_struct *vma,
unsigned long addr, unsigned long size,
struct scatterlist *sgl, resource_size_t iobase);
diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c
index 666808cb3a32..9a777b0ff59b 100644
--- a/drivers/gpu/drm/i915/i915_mm.c
+++ b/drivers/gpu/drm/i915/i915_mm.c
@@ -37,17 +37,6 @@ struct remap_pfn {
resource_size_t iobase;
};
-static int remap_pfn(pte_t *pte, unsigned long addr, void *data)
-{
- struct remap_pfn *r = data;
-
- /* Special PTE are not associated with any struct page */
- set_pte_at(r->mm, addr, pte, pte_mkspecial(pfn_pte(r->pfn, r->prot)));
- r->pfn++;
-
- return 0;
-}
-
#define use_dma(io) ((io) != -1)
static inline unsigned long sgt_pfn(const struct remap_pfn *r)
@@ -77,40 +66,7 @@ static int remap_sg(pte_t *pte, unsigned long addr, void *data)
return 0;
}
-/**
- * remap_io_mapping - remap an IO mapping to userspace
- * @vma: user vma to map to
- * @addr: target user address to start at
- * @pfn: physical address of kernel memory
- * @size: size of map area
- * @iomap: the source io_mapping
- *
- * Note: this is only safe if the mm semaphore is held when called.
- */
-int remap_io_mapping(struct vm_area_struct *vma,
- unsigned long addr, unsigned long pfn, unsigned long size,
- struct io_mapping *iomap)
-{
- struct remap_pfn r;
- int err;
-
#define EXPECTED_FLAGS (VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)
- GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS);
-
- /* We rely on prevalidation of the io-mapping to skip track_pfn(). */
- r.mm = vma->vm_mm;
- r.pfn = pfn;
- r.prot = __pgprot((pgprot_val(iomap->prot) & _PAGE_CACHE_MASK) |
- (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK));
-
- err = apply_to_page_range(r.mm, addr, size, remap_pfn, &r);
- if (unlikely(err)) {
- zap_vma_ptes(vma, addr, (r.pfn - pfn) << PAGE_SHIFT);
- return err;
- }
-
- return 0;
-}
/**
* remap_io_sg - remap an IO mapping to userspace