drm/i915/gem: Apply lmem size restriction to get_pages

When creating a handle, it is just that, an abstract handle. The fact
that we cannot currently support a handle larger than the size of the
backing storage is an artifact of our whole-object-at-a-time handling in
get_pages() and being an implementation limitation is best handled at
that point -- similar to shmem, where we only barf when asked to
populate the whole object if larger than RAM. (Pinning the whole object
at a time is major hindrance that we are likely to have to overcome in
the near future.) In the case of the buddy allocator, the late check is
preferable as the request size may often be smaller than the required
size.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191216122603.2598155-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
index 0e2bf6b..520cc9c 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
@@ -79,9 +79,6 @@ __i915_gem_lmem_object_create(struct intel_memory_region *mem,
        struct drm_i915_private *i915 = mem->i915;
        struct drm_i915_gem_object *obj;
 
-       if (size > BIT(mem->mm.max_order) * mem->mm.chunk_size)
-               return ERR_PTR(-E2BIG);
-
        obj = i915_gem_object_alloc();
        if (!obj)
                return ERR_PTR(-ENOMEM);

diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 3f99249..497c367 100644 (file)
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1420,7 +1420,7 @@ try_again:
 
                err = i915_gem_object_pin_pages(obj);
                if (err) {
-                       if (err == -ENXIO) {
+                       if (err == -ENXIO || err == -E2BIG) {
                                i915_gem_object_put(obj);
                                size >>= 1;
                                goto try_again;

diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index baaeaec..e24c280 100644 (file)
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -73,6 +73,9 @@ __intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
                min_order = ilog2(size) - ilog2(mem->mm.chunk_size);
        }
 
+       if (size > BIT(mem->mm.max_order) * mem->mm.chunk_size)
+               return -E2BIG;
+
        n_pages = size >> ilog2(mem->mm.chunk_size);
 
        mutex_lock(&mem->mm_lock);