bcd768d787
CCS save/restore batch buffers are attached during BO allocation and
detached during BO teardown. The shrinker triggers xe_bo_move(), which is
used for both allocation and deletion paths.
When BO allocation and shrinking occur concurrently, a circular locking
dependency involving fs_reclaim and swap_guard can occur, leading to a
deadlock such as:
*===============================================================*
* WARNING: possible circular locking dependency detected *
*---------------------------------------------------------------*
* *
* CPU0 CPU1 *
* ---- ---- *
* lock(fs_reclaim); *
* lock(&sa_manager->swap_guard); *
* lock(fs_reclaim); *
* lock(&sa_manager->swap_guard); *
* *
* *** DEADLOCK *** *
*===============================================================*
To avoid this, the BB pointer and SA are allocated using xe_bb_alloc()
before taking lock and SA is initialized using xe_bb_init() preventing
reclaim from being invoked in this context.
Fixes:
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|---|---|---|
| .. | ||
| drm | ||
| host1x | ||
| ipu-v3 | ||
| nova-core | ||
| trace | ||
| vga | ||
| Makefile | ||