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drm/i915/gvt: fix the usage of ww lock in gvt scheduler. 

As the APIs related to ww lock in i915 was changed recently, the usage of
ww lock in GVT-g scheduler needs to be changed accrodingly. We noticed a
deadlock when GVT-g scheduler submits the workload to i915. After some
investigation, it seems the way of how to use ww lock APIs has been
changed. Releasing a ww now requires a explicit i915_gem_ww_ctx_fini().

Fixes: 67f1120381 ("drm/i915/gvt: Introduce per object locking in GVT scheduler.")
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhi A Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210826143834.25410-1-zhi.a.wang@intel.com
Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com>
(cherry picked from commit d168cd7979)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Zhi A Wang 2021-08-26 14:38:34 +00:00 committed by Rodrigo Vivi
parent 5740211ea4
commit af6c83ae25
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/gvt/scheduler.c
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@ -576,7 +576,7 @@ retry:
/* No one is going to touch shadow bb from now on. */
i915_gem_object_flush_map(bb->obj);
i915_gem_object_unlock(bb->obj);
i915_gem_ww_ctx_fini(&ww);
}
}
return 0;
@ -630,7 +630,7 @@ retry:
return ret;
}
i915_gem_object_unlock(wa_ctx->indirect_ctx.obj);
i915_gem_ww_ctx_fini(&ww);
/* FIXME: we are not tracking our pinned VMA leaving it
* up to the core to fix up the stray pin_count upon