drm/i915/gt: Suspend tasklets before resume sanitization
It is possible for a residual tasklet to be pending execution as we
resume (whether that's some prior test kicking off the tasklet, or if we
are in a suspend/resume stress test). As such, we do not want that
tasklet to execute in the middle of our sanitization, such that it sees
the poisoned state. For example,
<4>[ 449.386553] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
<4>[ 449.386555] CPU: 1 PID: 5115 Comm: i915_selftest Tainted: G U W 5.7.0-rc4-CI-CI_DRM_8472+ #1
<4>[ 449.386556] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake U DDR4 SODIMM PD RVP TLC, BIOS ICLSFWR1.R00.3183.A00.
1905020411 05/02/2019
<4>[ 449.386585] RIP: 0010:process_csb+0x6bf/0x830 [i915]
<4>[ 449.386588] Code: 00 48 c7 c2 10 bc 4c a0 48 c7 c7 d4 75 34 a0 e8 87 0e e6 e0 bf 01 00 00 00 e8 9d e0 e5 e0 31 f6 bf 09 00 00 00 e8 e1 ba d6 e0 <0f> 0b 8b 87 10 05 00 00 85 c0 0f 85 5f f9 ff ff 48 c7 c1 70 a5 4f
<4>[ 449.386591] RSP: 0018:
ffffc90000170ea0 EFLAGS:
00010297
<4>[ 449.386594] RAX:
0000000080000101 RBX:
0000000000000000 RCX:
0000000000000000
<4>[ 449.386596] RDX:
ffff88849d5bc040 RSI:
0000000000000000 RDI:
0000000000000009
<4>[ 449.386598] RBP:
ffffc90000170f00 R08:
0000000000000000 R09:
0000000000000000
<4>[ 449.386600] R10:
0000000000000000 R11:
0000000000000000 R12:
ffff88843ccea018
<4>[ 449.386602] R13:
ffff88843ccea658 R14:
ffff88843ccea640 R15:
ffff88843ccea000
<4>[ 449.386605] FS:
00007f826a813300(0000) GS:
ffff88849fe80000(0000) knlGS:
0000000000000000
<4>[ 449.386607] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
<4>[ 449.386609] CR2:
0000560366b94280 CR3:
000000048ba02002 CR4:
0000000000760ee0
<4>[ 449.386611] PKRU:
55555554
<4>[ 449.386613] Call Trace:
<4>[ 449.386616] <IRQ>
<4>[ 449.386646] ? execlists_submission_tasklet+0xcf/0x140 [i915]
<4>[ 449.386674] execlists_submission_tasklet+0x2f/0x140 [i915]
<4>[ 449.386679] tasklet_action_common.isra.16+0x6c/0x1c0
<4>[ 449.386684] __do_softirq+0xdf/0x49e
<4>[ 449.386687] irq_exit+0xba/0xc0
<4>[ 449.386690] smp_apic_timer_interrupt+0xb7/0x280
<4>[ 449.386693] apic_timer_interrupt+0xf/0x20
<4>[ 449.386695] </IRQ>
<4>[ 449.386698] RIP: 0010:_raw_spin_unlock_irqrestore+0x49/0x60
<4>[ 449.386701] Code: c7 02 75 1f 53 9d e8 26 ab 75 ff bf 01 00 00 00 e8 7c a3 69 ff 65 8b 05 7d 9b 5c 7e 85 c0 74 0c 5b 5d c3 e8 09 aa 75 ff 53 9d <eb> df e8 ca 39 5b ff 5b 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00
<4>[ 449.386703] RSP: 0018:
ffffc90000a6b950 EFLAGS:
00000202 ORIG_RAX:
ffffffffffffff13
<4>[ 449.386706] RAX:
0000000080000001 RBX:
0000000000000202 RCX:
0000000000000000
<4>[ 449.386708] RDX:
ffff88849d5bc040 RSI:
ffff88849d5bc900 RDI:
ffffffff82386f12
<4>[ 449.386710] RBP:
ffff88847d400f00 R08:
ffff88849d5bc900 R09:
0000000000000000
<4>[ 449.386712] R10:
0000000000000000 R11:
0000000000000000 R12:
00000000ffff0b0b
<4>[ 449.386714] R13:
000000000000000c R14:
ffff88847d40bf70 R15:
ffff88847d40cef8
<4>[ 449.386742] reset_csb_pointers+0x59/0x140 [i915]
<4>[ 449.386769] execlists_sanitize+0x3e/0x60 [i915]
<4>[ 449.386797] gt_sanitize+0xd6/0x260 [i915]
As part of the reset preparation, engine->reset.prepare() prevents the
tasklet from running, so pull the sanitization inside the critical
section for reset.
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1812
Fixes: 4b9820ada0d3 ("drm/i915/gt: Scrub execlists state on resume")
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/20200513122826.27484-1-chris@chris-wilson.co.uk
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