[Intel-gfx] [PATCH 1/2] drm/i915: Document our internal limit on object size

[Chris Wilson]

In many places, we try to count pages using a 32 bit integer. That
implies if we are asked to create an object larger than 43bits, we will
subtly crash much later. Catch this on the boundary, and add a warning
to remind ourselves later on our exabyte systems.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.h |  2 +-
 drivers/gpu/drm/i915/i915_gem.c | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index fe875b27a6bf..43eb1a72f19e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3107,7 +3107,7 @@ void i915_gem_object_free(struct drm_i915_gem_object *obj);
 void i915_gem_object_init(struct drm_i915_gem_object *obj,
 			 const struct drm_i915_gem_object_ops *ops);
 struct drm_i915_gem_object *i915_gem_object_create(struct drm_device *dev,
-						  size_t size);
+						   u64 size);
 struct drm_i915_gem_object *i915_gem_object_create_from_data(
 		struct drm_device *dev, const void *data, size_t size);
 void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index fe92e28ea0a8..0d1dc04302ec 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4131,14 +4131,24 @@ static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
 	.put_pages = i915_gem_object_put_pages_gtt,
 };
 
-struct drm_i915_gem_object *i915_gem_object_create(struct drm_device *dev,
-						  size_t size)
+struct drm_i915_gem_object *
+i915_gem_object_create(struct drm_device *dev, u64 size)
 {
 	struct drm_i915_gem_object *obj;
 	struct address_space *mapping;
 	gfp_t mask;
 	int ret;
 
+	/* There is a prevalence of the assumption that we fit the object's
+	 * page count inside a 32bit variable. Let's document this and catch
+	 * if we ever need to fix it.
+	 */
+	if (WARN_ON(size >> PAGE_SHIFT > INT_MAX))
+		return ERR_PTR(-E2BIG);
+
+	if (sizeof(size_t) < sizeof(u64) && size > INT_MAX)
+		return ERR_PTR(-E2BIG);
+
 	obj = i915_gem_object_alloc(dev);
 	if (obj == NULL)
 		return ERR_PTR(-ENOMEM);
-- 
2.9.3