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When setting up the system to perform the atomic reset, we need to
serialise with any ongoing interrupt tasklet or else:
<0> [472.951428] i915_sel-4442 0d..1 466527056us : __i915_request_submit: rcs0 fence 11659:2, current 0
<0> [472.951554] i915_sel-4442 0d..1 466527059us : __execlists_submission_tasklet: rcs0: queue_priority_hint:-2147483648, submit:yes
<0> [472.951681] i915_sel-4442 0d..1 466527061us : trace_ports: rcs0: submit { 11659:2, 0:0 }
<0> [472.951805] i915_sel-4442 0.... 466527114us : __igt_atomic_reset_engine: i915_reset_engine(rcs0:active) under hardirq
<0> [472.951932] i915_sel-4442 0d... 466527115us : intel_engine_reset: rcs0 flags=11d
<0> [472.952056] i915_sel-4442 0d... 466527117us : execlists_reset_prepare: rcs0: depth<-1
<0> [472.952179] i915_sel-4442 0d... 466527119us : intel_engine_stop_cs: rcs0
<0> [472.952305] <idle>-0 1..s1 466527119us : process_csb: rcs0 cs-irq head=3, tail=4
<0> [472.952431] i915_sel-4442 0d... 466527122us : __intel_gt_reset: engine_mask=1
<0> [472.952557] <idle>-0 1..s1 466527124us : process_csb: rcs0 csb[4]: status=0x00000001:0x00000000
<0> [472.952683] <idle>-0 1..s1 466527130us : trace_ports: rcs0: promote { 11659:2*, 0:0 }
<0> [472.952808] i915_sel-4442 0d... 466527131us : execlists_reset: rcs0
<0> [472.952933] i915_sel-4442 0d..1 466527133us : process_csb: rcs0 cs-irq head=3, tail=4
<0> [472.953059] i915_sel-4442 0d..1 466527134us : process_csb: rcs0 csb[4]: status=0x00000001:0x00000000
<0> [472.953185] i915_sel-4442 0d..1 466527136us : trace_ports: rcs0: preempted { 11659:2*, 0:0 }
<0> [472.953310] i915_sel-4442 0d..1 466527150us : assert_pending_valid: Nothing pending for promotion!
<0> [472.953436] i915_sel-4442 0d..1 466527158us : process_csb: process_csb:1930 GEM_BUG_ON(!assert_pending_valid(execlists, "promote"))
We have the same CSB events being seen by process_csb() on two different
processors. One being issued by the reset in the test, the other by the
interrupt; this scenario is supposed to be prevented by flushing the
interrupt tasklet with tasklet_disable() before we enter the atomic
reset.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112069
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191023232443.17450-1-chris@chris-wilson.co.uk
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.