drm/xe: Fix memory leak when aborting binds

Make sure to call xe_pt_update_ops_fini in xe_pt_update_ops_abort to
free any memory the bind allocated.

Caught by kmemleak when running Vulkan CTS tests on LNL. The leak
seems to happen only when there's some kind of failure happening, like
the lack of memory. Example output:

unreferenced object 0xffff9120bdf62000 (size 8192):
  comm "deqp-vk", pid 115008, jiffies 4310295728
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 1b 05 f9 28 01 00 00 40  ...........(...@
    00 00 00 00 00 00 00 00 1b 15 f9 28 01 00 00 40  ...........(...@
  backtrace (crc 7a56be79):
    [<ffffffff86dd81f0>] __kmalloc_cache_noprof+0x310/0x3d0
    [<ffffffffc08e8211>] xe_pt_new_shared.constprop.0+0x81/0xb0 [xe]
    [<ffffffffc08e8309>] xe_pt_insert_entry+0xb9/0x140 [xe]
    [<ffffffffc08eab6d>] xe_pt_stage_bind_entry+0x12d/0x5b0 [xe]
    [<ffffffffc08ecbca>] xe_pt_walk_range+0xea/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08e9eff>] xe_pt_stage_bind.constprop.0+0x25f/0x580 [xe]
    [<ffffffffc08eb21a>] bind_op_prepare+0xea/0x6e0 [xe]
    [<ffffffffc08ebab8>] xe_pt_update_ops_prepare+0x1c8/0x440 [xe]
    [<ffffffffc08ffbf3>] ops_execute+0x143/0x850 [xe]
    [<ffffffffc0900b64>] vm_bind_ioctl_ops_execute+0x244/0x800 [xe]
    [<ffffffffc0906467>] xe_vm_bind_ioctl+0x1877/0x2370 [xe]
    [<ffffffffc05e92b3>] drm_ioctl_kernel+0xb3/0x110 [drm]
unreferenced object 0xffff9120bdf72000 (size 8192):
  comm "deqp-vk", pid 115008, jiffies 4310295728
  hex dump (first 32 bytes):
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
  backtrace (crc 23b2f0b5):
    [<ffffffff86dd81f0>] __kmalloc_cache_noprof+0x310/0x3d0
    [<ffffffffc08e8211>] xe_pt_new_shared.constprop.0+0x81/0xb0 [xe]
    [<ffffffffc08e8453>] xe_pt_stage_unbind_post_descend+0xb3/0x150 [xe]
    [<ffffffffc08ecd26>] xe_pt_walk_range+0x246/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08eccea>] xe_pt_walk_range+0x20a/0x280 [xe]
    [<ffffffffc08ece31>] xe_pt_walk_shared+0xc1/0x110 [xe]
    [<ffffffffc08e7b2a>] xe_pt_stage_unbind+0x9a/0xd0 [xe]
    [<ffffffffc08e913d>] unbind_op_prepare+0xdd/0x270 [xe]
    [<ffffffffc08eb9f6>] xe_pt_update_ops_prepare+0x106/0x440 [xe]
    [<ffffffffc08ffbf3>] ops_execute+0x143/0x850 [xe]
    [<ffffffffc0900b64>] vm_bind_ioctl_ops_execute+0x244/0x800 [xe]
    [<ffffffffc0906467>] xe_vm_bind_ioctl+0x1877/0x2370 [xe]
    [<ffffffffc05e92b3>] drm_ioctl_kernel+0xb3/0x110 [drm]
    [<ffffffffc05e95a0>] drm_ioctl+0x280/0x4e0 [drm]

Reported-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2877
Fixes: a708f6501c69 ("drm/xe: Update PT layer with better error handling")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240927232228.3255246-1-matthew.brost@intel.com

diff --git a/drivers/gpu/drm/xe/xe_pt.c b/drivers/gpu/drm/xe/xe_pt.c
index d6353e8969f032a50e0c184fb73bdfb32b189a37..f27f579f4d85aacc6511bb77c2523db40e3abb51 100644 (file)
--- a/drivers/gpu/drm/xe/xe_pt.c
+++ b/drivers/gpu/drm/xe/xe_pt.c
@@ -2188,5 +2188,5 @@ void xe_pt_update_ops_abort(struct xe_tile *tile, struct xe_vma_ops *vops)
                                           pt_op->num_entries);
        }
 
-       xe_bo_put_commit(&vops->pt_update_ops[tile->id].deferred);
+       xe_pt_update_ops_fini(tile, vops);
 }