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a79ca656b6
linux_dsm_epyc7002/drivers/gpu/drm/i915
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Chris Wilson a79ca656b6 drm/i915: Push the wakeref->count deferral to the backend 
If the backend wishes to defer the wakeref parking, make it responsible
for unlocking the wakeref (i.e. bumping the counter). This allows it to
time the unlock much more carefully in case it happens to needs the
wakeref to be active during its deferral.

For instance, during engine parking we may choose to emit an idle
barrier (a request). To do so, we borrow the engine->kernel_context
timeline and to ensure exclusive access we keep the
engine->wakeref.count as 0. However, to submit that request to HW may
require a intel_engine_pm_get() (e.g. to keep the submission tasklet
alive) and before we allow that we have to rewake our wakeref to avoid a
recursive deadlock.

<4> [257.742916] IRQs not enabled as expected
<4> [257.742930] WARNING: CPU: 0 PID: 0 at kernel/softirq.c:169 __local_bh_enable_ip+0xa9/0x100
<4> [257.742936] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915 btusb btrtl btbcm btintel snd_hda_intel snd_intel_nhlt bluetooth snd_hda_codec coretemp snd_hwdep crct10dif_pclmul snd_hda_core crc32_pclmul ecdh_generic ecc ghash_clmulni_intel snd_pcm r8169 realtek lpc_ich prime_numbers i2c_hid
<4> [257.742991] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G     U  W         5.3.0-rc3-g5d0a06cd532c-drmtip_340+ #1
<4> [257.742998] Hardware name: GIGABYTE GB-BXBT-1900/MZBAYAB-00, BIOS F6 02/17/2015
<4> [257.743008] RIP: 0010:__local_bh_enable_ip+0xa9/0x100
<4> [257.743017] Code: 37 5b 5d c3 8b 80 50 08 00 00 85 c0 75 a9 80 3d 0b be 25 01 00 75 a0 48 c7 c7 f3 0c 06 ac c6 05 fb bd 25 01 01 e8 77 84 ff ff <0f> 0b eb 89 48 89 ef e8 3b 41 06 00 eb 98 e8 e4 5c f4 ff 5b 5d c3
<4> [257.743025] RSP: 0018:ffffa78600003cb8 EFLAGS: 00010086
<4> [257.743035] RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000010302
<4> [257.743042] RDX: 0000000080010302 RSI: 0000000000000000 RDI: 00000000ffffffff
<4> [257.743050] RBP: ffffffffc0494bb3 R08: 0000000000000000 R09: 0000000000000001
<4> [257.743058] R10: 0000000014c8f0e9 R11: 00000000fee2ff8e R12: ffffa23ba8c38008
<4> [257.743065] R13: ffffa23bacc579c0 R14: ffffa23bb7db0f60 R15: ffffa23b9cc8c430
<4> [257.743074] FS:  0000000000000000(0000) GS:ffffa23bbba00000(0000) knlGS:0000000000000000
<4> [257.743082] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [257.743089] CR2: 00007fe477b20778 CR3: 000000011f72a000 CR4: 00000000001006f0
<4> [257.743096] Call Trace:
<4> [257.743104]  <IRQ>
<4> [257.743265]  __i915_request_commit+0x240/0x5d0 [i915]
<4> [257.743427]  ? __i915_request_create+0x228/0x4c0 [i915]
<4> [257.743584]  __engine_park+0x64/0x250 [i915]
<4> [257.743730]  ____intel_wakeref_put_last+0x1c/0x70 [i915]
<4> [257.743878]  i915_sample+0x2ee/0x310 [i915]
<4> [257.744030]  ? i915_pmu_cpu_offline+0xb0/0xb0 [i915]
<4> [257.744040]  __hrtimer_run_queues+0x11e/0x4b0
<4> [257.744068]  hrtimer_interrupt+0xea/0x250
<4> [257.744079]  ? lockdep_hardirqs_off+0x79/0xd0
<4> [257.744101]  smp_apic_timer_interrupt+0x96/0x280
<4> [257.744114]  apic_timer_interrupt+0xf/0x20
<4> [257.744125] RIP: 0010:__do_softirq+0xb3/0x4ae

v2: Keep the priority_hint assert
v3: That assert was desperately trying to point out my bug. Sorry, little
assert.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111378
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190813190705.23869-1-chris@chris-wilson.co.uk
2019-08-13 21:09:49 +01:00
..
display drm/i915/overlay: Switch to using i915_active tracking 2019-08-12 19:29:17 +01:00
gem drm/i915/blt: support copying objects 2019-08-10 19:35:36 +01:00
gt drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
gvt drm/i915: Push the ring creation flags to the backend 2019-08-09 20:18:30 +01:00
oa drm/i915/perf: Refactor oa object to better manage resources 2019-08-07 20:34:39 +01:00
selftests drm/i915: buddy allocator 2019-08-10 19:47:40 +01:00
i915_active_types.h drm/i915: Allow sharing the idle-barrier from other kernel requests 2019-08-02 11:53:04 +01:00
i915_active.c drm/i915: Lift timeline into intel_context 2019-08-09 20:18:30 +01:00
i915_active.h drm/i915/overlay: Switch to using i915_active tracking 2019-08-12 19:29:17 +01:00
i915_buddy.c drm/i915: buddy allocator 2019-08-10 19:47:40 +01:00
i915_buddy.h drm/i915: buddy allocator 2019-08-10 19:47:40 +01:00
i915_cmd_parser.c drm/i915: extract i915_memcpy.h from i915_drv.h 2019-08-09 12:03:25 +03:00
i915_debugfs.c drm/i915: Forgo last_fence active request tracking 2019-08-12 19:29:16 +01:00
i915_debugfs.h
i915_drv.c drm/i915: split out uncore_mmio_debug 2019-08-09 20:25:24 +01:00
i915_drv.h drm/i915: Extract general GT interrupt handlers 2019-08-12 15:36:13 +01:00
i915_fixed.h
i915_gem_evict.c drm/i915: remove unnecessary includes of intel_display_types.h header 2019-08-07 12:43:55 +03:00
i915_gem_fence_reg.c drm/i915: Forgo last_fence active request tracking 2019-08-12 19:29:16 +01:00
i915_gem_fence_reg.h
i915_gem_gtt.c drm/i915: Forgo last_fence active request tracking 2019-08-12 19:29:16 +01:00
i915_gem_gtt.h drm/i915: Move aliasing_ppgtt underneath its i915_ggtt 2019-07-30 16:09:32 +01:00
i915_gem.c drm/i915/uc: Use -EIO code for GuC initialization failures 2019-08-12 09:47:43 +01:00
i915_gem.h drm/i915: avoid including intel_drv.h via i915_drv.h->i915_trace.h 2019-08-07 12:43:14 +03:00
i915_getparam.c drm/i915: Isolate i915_getparam_ioctl() 2019-08-07 16:48:24 +01:00
i915_globals.c drm/i915: buddy allocator 2019-08-10 19:47:40 +01:00
i915_globals.h drm/i915: buddy allocator 2019-08-10 19:47:40 +01:00
i915_gpu_error.c drm/i915/uc: Log fw status changes only under debug config 2019-08-13 10:46:15 +01:00
i915_gpu_error.h drm/i915: Only include active engines in the capture state 2019-08-08 21:54:08 +01:00
i915_ioc32.c
i915_irq.c drm/i915: Extract general GT interrupt handlers 2019-08-12 15:36:13 +01:00
i915_irq.h drm/i915: Extract general GT interrupt handlers 2019-08-12 15:36:13 +01:00
i915_memcpy.c drm/i915: extract i915_memcpy.h from i915_drv.h 2019-08-09 12:03:25 +03:00
i915_memcpy.h drm/i915: extract i915_memcpy.h from i915_drv.h 2019-08-09 12:03:25 +03:00
i915_mm.c drm/i915: Drop expectations of VM_IO from our GGTT mmappings 2019-08-07 12:06:07 +01:00
i915_params.c Revert "drm/i915: Update description of i915.enable_guc modparam" 2019-07-19 15:36:21 +01:00
i915_params.h Revert "drm/i915/guc: Turn on GuC/HuC auto mode" 2019-07-19 15:35:58 +01:00
i915_pci.c drm/i915/gtt: disable 2M pages for pre-gen11 2019-08-10 13:19:00 +01:00
i915_perf.c drm/i915: extract i915_perf.h from i915_drv.h 2019-08-09 11:52:04 +03:00
i915_perf.h drm/i915: extract i915_perf.h from i915_drv.h 2019-08-09 11:52:04 +03:00
i915_pmu.c drm/i915/gt: Move the [class][inst] lookup for engines onto the GT 2019-08-06 15:00:43 +01:00
i915_pmu.h
i915_priolist_types.h drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
i915_pvinfo.h
i915_query.c drm/i915/gt: Move the [class][inst] lookup for engines onto the GT 2019-08-06 15:00:43 +01:00
i915_query.h
i915_reg.h drm/i915/tgl: Fix missing parentheses on TGL_TRANS_DDI_FUNC_CTL_VAL_TO_PORT 2019-08-13 09:59:26 -07:00
i915_request.c drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
i915_request.h drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
i915_scatterlist.c
i915_scatterlist.h
i915_scheduler_types.h
i915_scheduler.c drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
i915_scheduler.h
i915_selftest.h drm/i915: make i915_selftest.h self-contained 2019-07-30 13:41:35 -07:00
i915_suspend.c drm/i915: extract i915_suspend.h from i915_drv.h 2019-08-09 12:03:05 +03:00
i915_suspend.h drm/i915: extract i915_suspend.h from i915_drv.h 2019-08-09 12:03:05 +03:00
i915_sw_fence.c
i915_sw_fence.h
i915_syncmap.c
i915_syncmap.h
i915_sysfs.c drm/i915: extract i915_sysfs.h from i915_drv.h 2019-08-09 11:52:09 +03:00
i915_sysfs.h drm/i915: extract i915_sysfs.h from i915_drv.h 2019-08-09 11:52:09 +03:00
i915_trace_points.c
i915_trace.h drm/i915: rename intel_drv.h to display/intel_display_types.h 2019-08-07 12:43:50 +03:00
i915_user_extensions.c
i915_user_extensions.h
i915_utils.c drm/i915: move printing and load error inject to i915_utils.[ch] 2019-08-09 11:51:58 +03:00
i915_utils.h drm/i915: move printing and load error inject to i915_utils.[ch] 2019-08-09 11:51:58 +03:00
i915_vgpu.c drm/i915: remove unnecessary includes of intel_display_types.h header 2019-08-07 12:43:55 +03:00
i915_vgpu.h
i915_vma.c drm/i915: Forgo last_fence active request tracking 2019-08-12 19:29:16 +01:00
i915_vma.h drm/i915: Forgo last_fence active request tracking 2019-08-12 19:29:16 +01:00
intel_csr.c drm/i915/dmc: Load DMC on TGL 2019-08-06 08:32:38 -07:00
intel_csr.h
intel_device_info.c drm/i915/tgl: Check if pipe D is fused 2019-07-11 16:31:03 -07:00
intel_device_info.h drm/i915/tgl: Tigerlake only has global MOCS registers 2019-07-31 07:40:32 -07:00
intel_gvt.c drm/i915: Add i915 to i915_inject_probe_failure 2019-08-02 21:14:29 +01:00
intel_gvt.h drm/i915: Propagate "_remove" function name suffix down 2019-07-12 13:05:08 +01:00
intel_pch.c drm/i915: split out intel_pch.[ch] from i915_drv.[ch] 2019-08-08 11:38:22 +03:00
intel_pch.h drm/i915: split out intel_pch.[ch] from i915_drv.[ch] 2019-08-08 11:38:22 +03:00
intel_pm.c drm/i915/gtt: enable GTT cache by default 2019-08-10 13:18:32 +01:00
intel_pm.h drm/i915: Convert most of atomic commit to take more intel state 2019-07-01 10:32:14 +02:00
intel_runtime_pm.c drm/i915: avoid including intel_drv.h via i915_drv.h->i915_trace.h 2019-08-07 12:43:14 +03:00
intel_runtime_pm.h Merge drm/drm-next into drm-intel-next-queued 2019-07-29 08:51:48 -07:00
intel_sideband.c drm/i915: remove unnecessary includes of intel_display_types.h header 2019-08-07 12:43:55 +03:00
intel_sideband.h
intel_uncore.c drm/i915: split out uncore_mmio_debug 2019-08-09 20:25:24 +01:00
intel_uncore.h drm/i915: split out uncore_mmio_debug 2019-08-09 20:25:24 +01:00
intel_wakeref.c drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
intel_wakeref.h drm/i915: Push the wakeref->count deferral to the backend 2019-08-13 21:09:49 +01:00
intel_wopcm.c drm/i915: Make wopcm_to_i915() private 2019-08-07 20:53:17 +01:00
intel_wopcm.h drm/i915/wopcm: Don't fail on WOPCM partitioning failure 2019-08-02 21:14:32 +01:00
Kconfig
Kconfig.debug drm/i915: use upstream version of header tests 2019-07-30 12:11:57 +03:00
Kconfig.profile
Makefile drm/i915: Extract general GT interrupt handlers 2019-08-12 15:36:13 +01:00