[Intel-gfx] [PATCH] drm/i915: vfree() no longer ignores the low bits of the address

[Chris Wilson]

Since vfree() now likes to WARN when passed a none page-aligned pointer,
we need to discard the low bits to comply with it.

Fixes: d31d7cb1460c ("drm/i915: Support for creating write combined type vmaps")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  5 +++++
 drivers/gpu/drm/i915/i915_gem.c | 11 +++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 35caa9b2f36a..cc1e72dbf18e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3896,6 +3896,11 @@ static inline bool __i915_request_irq_complete(struct drm_i915_gem_request *req)
 void i915_memcpy_init_early(struct drm_i915_private *dev_priv);
 bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len);
 
+#define ptr_mask_bits(ptr) ({						\
+	unsigned long __v = (unsigned long)(ptr);			\
+	(typeof(ptr))(__v & PAGE_MASK);					\
+})
+
 #define ptr_unpack_bits(ptr, bits) ({					\
 	unsigned long __v = (unsigned long)(ptr);			\
 	(bits) = __v & ~PAGE_MASK;					\
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index a8d0f70c22f9..cffa57b14246 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2094,11 +2094,14 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
 	list_del(&obj->global_list);
 
 	if (obj->mapping) {
-		/* low bits are ignored by is_vmalloc_addr and kmap_to_page */
-		if (is_vmalloc_addr(obj->mapping))
-			vunmap(obj->mapping);
+		void *ptr;
+
+		ptr = ptr_mask_bits(obj->mapping);
+		if (is_vmalloc_addr(ptr))
+			vunmap(ptr);
 		else
-			kunmap(kmap_to_page(obj->mapping));
+			kunmap(kmap_to_page(ptr));
+
 		obj->mapping = NULL;
 	}
 
-- 
2.9.3