Chris Wilson
fa192d90cf
drm/i915/execlists: Mark up read of i915_request.fence.flags
[ 145.927961] BUG: KCSAN: data-race in can_merge_rq [i915] / signal_irq_work [i915]
[ 145.927980]
[ 145.927992] write (marked) to 0xffff8881e513fab0 of 8 bytes by interrupt on cpu 2:
[ 145.928250] signal_irq_work+0x134/0x640 [i915]
[ 145.928268] irq_work_run_list+0xd7/0x120
[ 145.928283] irq_work_run+0x1d/0x50
[ 145.928300] smp_irq_work_interrupt+0x21/0x30
[ 145.928328] irq_work_interrupt+0xf/0x20
[ 145.928356] _raw_spin_unlock_irqrestore+0x34/0x40
[ 145.928596] execlists_submission_tasklet+0xde/0x170 [i915]
[ 145.928616] tasklet_action_common.isra.0+0x42/0xa0
[ 145.928632] __do_softirq+0xd7/0x2cd
[ 145.928646] irq_exit+0xbe/0xe0
[ 145.928665] do_IRQ+0x51/0x100
[ 145.928684] ret_from_intr+0x0/0x1c
[ 145.928699] schedule+0x0/0xb0
[ 145.928719] worker_thread+0x194/0x670
[ 145.928743] kthread+0x19a/0x1e0
[ 145.928765] ret_from_fork+0x1f/0x30
[ 145.928784]
[ 145.928796] read to 0xffff8881e513fab0 of 8 bytes by task 738 on cpu 1:
[ 145.929046] can_merge_rq+0xb1/0x100 [i915]
[ 145.929282] __execlists_submission_tasklet+0x866/0x25a0 [i915]
[ 145.929518] execlists_submit_request+0x2a4/0x2b0 [i915]
[ 145.929758] submit_notify+0x8f/0xc0 [i915]
[ 145.929989] __i915_sw_fence_complete+0x5d/0x3e0 [i915]
[ 145.930221] i915_sw_fence_complete+0x58/0x80 [i915]
[ 145.930453] i915_sw_fence_commit+0x16/0x20 [i915]
[ 145.930698] __i915_request_queue+0x60/0x70 [i915]
[ 145.930935] i915_gem_do_execbuffer+0x3997/0x4c20 [i915]
[ 145.931175] i915_gem_execbuffer2_ioctl+0x2c3/0x580 [i915]
[ 145.931194] drm_ioctl_kernel+0xe4/0x120
[ 145.931208] drm_ioctl+0x297/0x4c7
[ 145.931222] ksys_ioctl+0x89/0xb0
[ 145.931238] __x64_sys_ioctl+0x42/0x60
[ 145.931260] do_syscall_64+0x6e/0x2c0
[ 145.931275] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200309110934.868-4-chris@chris-wilson.co.uk
2020-03-09 18:24:13 +00:00
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