diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2017-12-20 01:09:16 +0300 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2017-12-20 02:04:45 +0300 |
| commit | 16c8619a7c53fe05526c31d4758be0eeabd16364 (patch) | |
| tree | a33f40a0c2c3e5e10e531b72f06ac3bfe8b88135 /drivers/gpu/drm/i915/intel_lrc.c | |
| parent | 93dff1008a4ef92aaf26b4b188a09a1acc4522df (diff) | |
| download | linux-16c8619a7c53fe05526c31d4758be0eeabd16364.tar.xz | |
drm/i915: Avoid context dereference inside execlists_submission_tasklet
A lesson that has to be relearnt over and over again is that the request
does not keep a reference to the context and so we cannot freely
dereference the context from inside the execlists_submission_tasklet. In
particular, we try to do so in the new GEM_TRACE() so convert those over
to the port->context_id we keep for GEM debugging. This means the
tracing now depends on DRM_I915_GEM_DEBUG.
Fixes: bccd3b831185 ("drm/i915: Use trace_printk to provide a death rattle for GEM")
References: https://bugs.freedesktop.org/show_bug.cgi?id=104066
References: https://bugs.freedesktop.org/show_bug.cgi?id=104162
References: https://bugs.freedesktop.org/show_bug.cgi?id=104242
References: https://bugs.freedesktop.org/show_bug.cgi?id=104310
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171219220916.30882-1-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lrc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 2e38fbfdf08f..6205d320b86f 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -449,7 +449,7 @@ static void execlists_submit_ports(struct intel_engine_cs *engine) GEM_TRACE("%s in[%d]: ctx=%d.%d, seqno=%x\n", engine->name, n, - rq->ctx->hw_id, count, + port[n].context_id, count, rq->global_seqno); } else { GEM_BUG_ON(!n); @@ -861,7 +861,7 @@ static void execlists_submission_tasklet(unsigned long data) */ status = READ_ONCE(buf[2 * head]); /* maybe mmio! */ - GEM_TRACE("%s csb[%dd]: status=0x%08x:0x%08x\n", + GEM_TRACE("%s csb[%d]: status=0x%08x:0x%08x\n", engine->name, head, status, buf[2*head + 1]); @@ -905,7 +905,7 @@ static void execlists_submission_tasklet(unsigned long data) rq = port_unpack(port, &count); GEM_TRACE("%s out[0]: ctx=%d.%d, seqno=%x\n", engine->name, - rq->ctx->hw_id, count, + port->context_id, count, rq->global_seqno); GEM_BUG_ON(count == 0); if (--count == 0) { |