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Once inside a request, inside the timeline->mutex, pinning is verboten.
<4> [896.032829] ======================================================
<4> [896.032831] WARNING: possible circular locking dependency detected
<4> [896.032835] 5.4.0-rc8-CI-Patchwork_15533+ #1 Tainted: G U
<4> [896.032838] ------------------------------------------------------
<4> [896.032841] gem_exec_parall/3720 is trying to acquire lock:
<4> [896.032844] ffff888401863270 (&kernel#2){+.+.}, at: i915_request_create+0x16/0x1c0 [i915]
<4> [896.032915]
but task is already holding lock:
<4> [896.032917] ffff8883ec1c93c0 (&vm->mutex){+.+.}, at: i915_vma_pin+0xf3/0x11c0 [i915]
<4> [896.032952]
which lock already depends on the new lock.
<4> [896.032954]
the existing dependency chain (in reverse order) is:
<4> [896.032956]
-> #1 (&vm->mutex){+.+.}:
<4> [896.032961] __mutex_lock+0x9a/0x9d0
<4> [896.032995] i915_vma_pin+0xf3/0x11c0 [i915]
<4> [896.033033] intel_renderstate_emit+0xb9/0x9e0 [i915]
<4> [896.033081] i915_gem_init+0x5a9/0xa50 [i915]
<4> [896.033112] i915_driver_probe+0xb00/0x15f0 [i915]
<4> [896.033144] i915_pci_probe+0x43/0x1c0 [i915]
<4> [896.033149] pci_device_probe+0x9e/0x120
<4> [896.033154] really_probe+0xea/0x420
<4> [896.033158] driver_probe_device+0x10b/0x120
<4> [896.033161] device_driver_attach+0x4a/0x50
<4> [896.033164] __driver_attach+0x97/0x130
<4> [896.033168] bus_for_each_dev+0x74/0xc0
<4> [896.033171] bus_add_driver+0x142/0x220
<4> [896.033174] driver_register+0x56/0xf0
<4> [896.033178] do_one_initcall+0x58/0x2ff
<4> [896.033183] do_init_module+0x56/0x1f8
<4> [896.033187] load_module+0x243e/0x29f0
<4> [896.033190] __do_sys_finit_module+0xe9/0x110
<4> [896.033194] do_syscall_64+0x4f/0x210
<4> [896.033197] entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [896.033200]
-> #0 (&kernel#2){+.+.}:
<4> [896.033206] __lock_acquire+0x1328/0x15d0
<4> [896.033209] lock_acquire+0xa7/0x1c0
<4> [896.033213] __mutex_lock+0x9a/0x9d0
<4> [896.033255] i915_request_create+0x16/0x1c0 [i915]
<4> [896.033287] intel_engine_flush_barriers+0x4c/0x100 [i915]
<4> [896.033327] ggtt_flush+0x37/0x60 [i915]
<4> [896.033366] i915_gem_evict_something+0x46b/0x5a0 [i915]
<4> [896.033407] i915_gem_gtt_insert+0x21d/0x6a0 [i915]
<4> [896.033449] i915_vma_pin+0xb36/0x11c0 [i915]
<4> [896.033488] gen6_ppgtt_pin+0xd5/0x170 [i915]
<4> [896.033523] ring_context_pin+0x2e/0xc0 [i915]
<4> [896.033554] __intel_context_do_pin+0x6b/0x190 [i915]
<4> [896.033591] i915_gem_do_execbuffer+0x1814/0x26c0 [i915]
<4> [896.033627] i915_gem_execbuffer2_ioctl+0x11b/0x460 [i915]
<4> [896.033632] drm_ioctl_kernel+0xa7/0xf0
<4> [896.033635] drm_ioctl+0x2e1/0x390
<4> [896.033638] do_vfs_ioctl+0xa0/0x6f0
<4> [896.033641] ksys_ioctl+0x35/0x60
<4> [896.033644] __x64_sys_ioctl+0x11/0x20
<4> [896.033647] do_syscall_64+0x4f/0x210
<4> [896.033650] entry_SYSCALL_64_after_hwframe+0x49/0xbe
Lift the object allocation and pin prior to the request construction.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191202204316.2665847-1-chris@chris-wilson.co.uk
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Chris Wilson