[PATCH V2] drm/i915: Replace kmap() with kmap_local_page()

[ira.weiny@intel.com]

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>

---
NOTE: I'm sending as a follow on to the V1 patch.  Please let me know if you
prefer the entire series instead.

Changes for V2:
	From Christoph Helwig
	Prefer the use of memcpy_*_page() where appropriate.
---
 drivers/gpu/drm/i915/gem/i915_gem_shmem.c          | 6 ++----
 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              | 7 ++-----
 drivers/gpu/drm/i915/i915_gem.c                    | 8 ++++----
 drivers/gpu/drm/i915/i915_gpu_error.c              | 4 ++--
 6 files changed, 16 insertions(+), 21 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..842e089aaaa5 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
@@ -589,7 +589,7 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv,
 	do {
 		unsigned int len = min_t(typeof(size), size, PAGE_SIZE);
 		struct page *page;
-		void *pgdata, *vaddr;
+		void *pgdata;
 
 		err = pagecache_write_begin(file, file->f_mapping,
 					    offset, len, 0,
@@ -597,9 +597,7 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv,
 		if (err < 0)
 			goto fail;
 
-		vaddr = kmap(page);
-		memcpy(vaddr, data, len);
-		kunmap(page);
+		memcpy_to_page(page, 0, data, len);
 
 		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..d47f262d2f07 100644
--- a/drivers/gpu/drm/i915/gt/shmem_utils.c
+++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
@@ -97,22 +97,19 @@ static int __shmem_rw(struct file *file, loff_t off,
 		unsigned int this =
 			min_t(size_t, PAGE_SIZE - offset_in_page(off), len);
 		struct page *page;
-		void *vaddr;
 
 		page = shmem_read_mapping_page_gfp(file->f_mapping, pfn,
 						   GFP_KERNEL);
 		if (IS_ERR(page))
 			return PTR_ERR(page);
 
-		vaddr = kmap(page);
 		if (write) {
-			memcpy(vaddr + offset_in_page(off), ptr, this);
+			memcpy_to_page(page, offset_in_page(off), ptr, this);
 			set_page_dirty(page);
 		} else {
-			memcpy(ptr, vaddr + offset_in_page(off), this);
+			memcpy_from_page(ptr, page, offset_in_page(off), this);
 		}
 		mark_page_accessed(page);
-		kunmap(page);
 		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);
 
-- 
2.31.1