[PATCH v2 05/21] drm/i915: Make use of the new sg_map helper function

Logan Gunthorpe
2017-04-25T18:20:52Z

This is a single straightforward conversion from kmap to sg_map.

We also create the i915_gem_object_unmap function to common up the
unmap code.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/gpu/drm/i915/i915_gem.c | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 07e9b27..2c33000 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2202,6 +2202,15 @@ static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
radix_tree_delete(&obj->mm.get_page.radix, iter.index);
}

+static void i915_gem_object_unmap(const struct drm_i915_gem_object *obj,
+ void *ptr)
+{
+ if (is_vmalloc_addr(ptr))
+ vunmap(ptr);
+ else
+ sg_unmap(obj->mm.pages->sgl, ptr, 0, SG_KMAP);
+}
+
void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
enum i915_mm_subclass subclass)
{
@@ -2229,10 +2238,7 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
void *ptr;

ptr = ptr_mask_bits(obj->mm.mapping);
- if (is_vmalloc_addr(ptr))
- vunmap(ptr);
- else
- kunmap(kmap_to_page(ptr));
+ i915_gem_object_unmap(obj, ptr);

obj->mm.mapping = NULL;
}
@@ -2499,8 +2505,11 @@ static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
void *addr;

/* A single page can always be kmapped */
- if (n_pages == 1 && type == I915_MAP_WB)
- return kmap(sg_page(sgt->sgl));
+ if (n_pages == 1 && type == I915_MAP_WB) {
+ addr = sg_map(sgt->sgl, 0, SG_KMAP);
+ if (IS_ERR(addr))
+ return NULL;
+ }

if (n_pages > ARRAY_SIZE(stack_pages)) {
/* Too big for stack -- allocate temporary array instead */
@@ -2567,11 +2576,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
goto err_unpin;
}

- if (is_vmalloc_addr(ptr))
- vunmap(ptr);
- else
- kunmap(kmap_to_page(ptr));
-
+ i915_gem_object_unmap(obj, ptr);
ptr = obj->mm.mapping = NULL;
}

--
2.1.4

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