| Summary: |
[HSW] compute indirect dispatch with 0 work groups causes gpu hang |
| Product: |
Mesa
|
Reporter: |
Ilia Mirkin <imirkin> |
| Component: |
Drivers/DRI/i965 | Assignee: |
Ian Romanick <idr> |
| Status: |
RESOLVED
FIXED
|
QA Contact: |
Intel 3D Bugs Mailing List <intel-3d-bugs> |
| Severity: |
normal
|
|
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| Priority: |
medium
|
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| Version: |
git | |
|
| Hardware: |
Other | |
|
| OS: |
All | |
|
| Whiteboard: |
|
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i915 platform:
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i915 features:
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|---|
| Attachments: |
dirty patch to conditionally terminate batch on hsw
|
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From the ARB_compute_shader spec: The command void DispatchComputeIndirect(intptr indirect); is equivalent (assuming no errors are generated) to calling DispatchCompute with <num_groups_x>, <num_groups_y> and <num_groups_z> initialized with the three uint values contained in the buffer currently bound to the DISPATCH_INDIRECT_BUFFER binding at an offset, in basic machine units, specified by <indirect>. ... If any of <num_groups_x>, <num_groups_y> or <num_groups_z> is greater than MAX_COMPUTE_WORK_GROUP_COUNT for the corresponding dimension then the results are undefined. And earlier there: "If the work group count in any dimension is zero, no work groups are dispatched." I suspect that GLES 3.1 says something similar, as there is a dEQP test that exercises this: dEQP-GLES31.functional.compute.indirect_dispatch.upload_buffer.empty_command Running it on a HSW with kernel 4.4.1 results in a GPU hang: [17904.184491] [drm] stuck on render ring [17904.185787] [drm] GPU HANG: ecode 7:0:0x8fd0ffff, in deqp-gles31 [17164], reason: Ring hung, action: reset [17904.185861] ------------[ cut here ]------------ [17904.185880] WARNING: CPU: 2 PID: 15876 at drivers/gpu/drm/i915/intel_display.c:11289 intel_mmio_flip_work_func+0x37d/0x3c0() [17904.185883] WARN_ON(__i915_wait_request(mmio_flip->req, mmio_flip->crtc->reset_counter, false, NULL, &mmio_flip->i915->rps.mmioflips)) [17904.185886] Modules linked in: [17904.185890] cfg80211 bcma x86_pkg_temp_thermal [17904.185900] CPU: 2 PID: 15876 Comm: kworker/2:0 Tainted: G W 4.4.1 #6 [17904.185903] Hardware name: Dell Inc. XPS 8700/0KWVT8, BIOS A08 04/16/2014 [17904.185910] Workqueue: events intel_mmio_flip_work_func [17904.185914] ffffffff81c1b398 ffff8801cb457d30 ffffffff813d684f ffff8801cb457d78 [17904.185920] ffff8801cb457d68 ffffffff810fd966 ffff8801fb7bfa80 ffff8801ac5fa240 [17904.185925] ffff88022fa94d00 0000000000000080 ffff88022fa99400 ffff8801cb457dc8 [17904.185931] Call Trace: [17904.185942] [<ffffffff813d684f>] dump_stack+0x44/0x55 [17904.185951] [<ffffffff810fd966>] warn_slowpath_common+0x86/0xc0 [17904.185957] [<ffffffff810fd9ec>] warn_slowpath_fmt+0x4c/0x50 [17904.185963] [<ffffffff81566d1d>] intel_mmio_flip_work_func+0x37d/0x3c0 [17904.185973] [<ffffffff81113dcc>] process_one_work+0x14c/0x3d0 [17904.185979] [<ffffffff8111436b>] worker_thread+0x4b/0x440 [17904.185986] [<ffffffff81114320>] ? rescuer_thread+0x2d0/0x2d0 [17904.185991] [<ffffffff81118f09>] kthread+0xc9/0xe0 [17904.185996] [<ffffffff81118e40>] ? kthread_park+0x60/0x60 [17904.186002] [<ffffffff818df89f>] ret_from_fork+0x3f/0x70 [17904.186006] [<ffffffff81118e40>] ? kthread_park+0x60/0x60 [17904.186010] ---[ end trace 1c4e38c670f10909 ]--- [17904.187422] drm/i915: Resetting chip after gpu hang Please let me know if any additional information is required.