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drm/i915: Ignore duplicate VMA stored within the per-object handle LUT 

By using drm_gem_flink/drm_gem_open on an object using the same fd, it
is possible for a client to create multiple handles pointing to the same
object (tied to the same contexts and VMA), as exemplified by
igt::gem_handle_to_libdrm_bo(). Since this duplication has been possible
since forever, we cannot assume that the handle:(fpriv, object) is
unique and so must handle the multiple users of a single VMA.

v2: Added commentary noise.

Testcase: igt/gem_close
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102355
Fixes: d1b48c1e71 ("drm/i915: Replace execbuf vma ht with an idr")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170822110517.22277-3-chris@chris-wilson.co.uk
Tested-by: Marta Lofstedt <marta.lofstedt@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
This commit is contained in:
Chris Wilson 2017-08-22 12:05:17 +01:00
parent 67b4804025
commit 3ffff01749
3 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/i915/i915_gem.c
View File

@ -3258,7 +3258,13 @@ void i915_gem_close_object(struct drm_gem_object *gem, struct drm_file *file)
continue;
vma = radix_tree_delete(&ctx->handles_vma, lut->handle);
if (!i915_vma_is_ggtt(vma))
GEM_BUG_ON(vma->obj != obj);
/* We allow the process to have multiple handles to the same
* vma, in the same fd namespace, by virtue of flink/open.
*/
GEM_BUG_ON(!vma->open_count);
if (!--vma->open_count && !i915_vma_is_ggtt(vma))
i915_vma_close(vma);
list_del(&lut->obj_link);

1
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -720,6 +720,7 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
goto err_obj;
}
vma->open_count++;
list_add(&lut->obj_link, &obj->lut_list);
list_add(&lut->ctx_link, &eb->ctx->handles_list);
lut->ctx = eb->ctx;

6
drivers/gpu/drm/i915/i915_vma.h
View File

@ -59,6 +59,12 @@ struct i915_vma {
u32 fence_size;
u32 fence_alignment;
/**
* Count of the number of times this vma has been opened by different
* handles (but same file) for execbuf, i.e. the number of aliases
* that exist in the ctx->handle_vmas LUT for this vma.
*/
unsigned int open_count;
unsigned int flags;
/**
* How many users have pinned this object in GTT space. The following