i915_gem_wait_for_idle() is called from inside the shrinker, to ensure
that we drain the last resources from the GPU in dire circumstances (OOM).
As we may allocate whilst building a request, it is then possible to hit
the shrinker with a request under construction, and so we must account
for the incomplete request whilst waiting. In particular, we
preincrement (in reserve_engine) the i915->gt.active_requests counter
and mark the GPU as busy, therefore we can use that counter for quickly
shortcircuiting the wait-for-idle.
[ 950.859024] GEM_BUG_ON(i915->gt.active_requests)
[ 950.859041] WARNING: CPU: 2 PID: 2178 at drivers/gpu/drm/i915/i915_gem.c:3615 i915_gem_wait_for_idle.part.56+0x166/0x4e0
[ 950.859041] Modules linked in: ccm tun fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_mangle iptable_security iptable_raw arc4 iwldvm mac80211 snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic snd_hda_intel snd_hda_codec btusb snd_hda_core btrtl btbcm iwlwifi snd_hwdep btintel bluetooth snd_seq snd_seq_device snd_pcm ecdh_generic x86_pkg_temp_thermal tpm_infineon coretemp tpm_tis crc32_pclmul wmi_bmof crc32c_intel iTCO_wdt hp_wmi snd_timer iTCO_vendor_support sparse_keymap tpm_tis_core mei_me cfg80211
[ 950.859082] snd joydev tpm mei rfkill pcspkr wmi soundcore lpc_ich hp_accel lis3lv02d input_polldev binfmt_misc e1000e ptp serio_raw pps_core
[ 950.859094] CPU: 2 PID: 2178 Comm: gem_exec_nop Tainted: G U 4.15.0-rc2+ #900
[ 950.859102] Hardware name: Hewlett-Packard HP ProBook 6360b/1620, BIOS 68SCF Ver. B.42 12/29/2010
[ 950.859107] task: c5119cb4 task.stack: f3ccb8d8
[ 950.859112] EIP: i915_gem_wait_for_idle.part.56+0x166/0x4e0
[ 950.859113] EFLAGS: 00010296 CPU: 2
[ 950.859114] EAX: 00000024 EBX: f36c1888 ECX: f777a044 EDX: 00000007
[ 950.859115] ESI: f36c1888 EDI: edd53958 EBP: edd53970 ESP: edd53938
[ 950.859116] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 950.859117] CR0: 80050033 CR2: b7f39000 CR3: 2f2b3000 CR4: 000406d0
[ 950.859118] Call Trace:
[ 950.859125] ? drm_printk+0x70/0x70
[ 950.859129] i915_gem_wait_for_idle+0x18/0x30
[ 950.859133] i915_gem_shrink+0x360/0x410
[ 950.859138] ? vmpressure+0xa8/0xf0
[ 950.859142] ? ktime_get+0x4a/0x100
[ 950.859147] i915_gem_shrink_all+0x21/0x40
[ 950.859151] i915_gem_shrinker_oom+0x23/0x130
[ 950.859156] notifier_call_chain+0x4e/0x70
[ 950.859160] __blocking_notifier_call_chain+0x2f/0x60
[ 950.859164] blocking_notifier_call_chain+0x11/0x20
[ 950.859169] out_of_memory+0x207/0x280
[ 950.859174] __alloc_pages_nodemask+0xd47/0xe60
[ 950.859179] new_slab+0x32d/0x450
[ 950.859183] ___slab_alloc.constprop.81+0x358/0x4e0
[ 950.859189] ? i915_sw_fence_await_dma_fence+0x53/0x160
[ 950.859193] ? __slab_free+0x1fe/0x310
[ 950.859197] ? native_sched_clock+0x1e/0xc0
[ 950.859201] ? i915_gem_request_alloc+0xcf/0x510
[ 950.859205] ? sched_clock+0x9/0x10
[ 950.859209] __slab_alloc.constprop.80+0x29/0x40
[ 950.859212] ? __slab_alloc.constprop.80+0x29/0x40
[ 950.859216] kmem_cache_alloc_trace+0x160/0x1a0
[ 950.859220] ? i915_sw_fence_await_dma_fence+0x53/0x160
[ 950.859224] i915_sw_fence_await_dma_fence+0x53/0x160
[ 950.859229] i915_gem_request_await_dma_fence+0x1eb/0x390
[ 950.859233] i915_gem_request_await_object+0xee/0x230
[ 950.859239] i915_gem_do_execbuffer+0xc16/0x1200
[ 950.859246] ? irqtime_account_irq+0x3e/0xc0
[ 950.859251] ? irq_exit+0x4f/0xb0
[ 950.859257] ? smp_apic_timer_interrupt+0x5f/0x110
[ 950.859261] ? apic_timer_interrupt+0x35/0x3c
[ 950.859266] i915_gem_execbuffer2_ioctl+0x212/0x440
[ 950.859270] ? apic_timer_interrupt+0x35/0x3c
[ 950.859274] ? i915_gem_do_execbuffer+0x1200/0x1200
[ 950.859279] ? insn_get_seg_base+0x1b/0x50
[ 950.859283] ? i915_gem_do_execbuffer+0x1200/0x1200
[ 950.859287] drm_ioctl_kernel+0x51/0xa0
[ 950.859291] drm_ioctl+0x2a3/0x350
[ 950.859294] ? i915_gem_do_execbuffer+0x1200/0x1200
[ 950.859300] ? sched_clock+0x9/0x10
[ 950.859303] ? drm_getunique+0x70/0x70
[ 950.859308] do_vfs_ioctl+0x7d/0x640
[ 950.859311] ? native_sched_clock+0x1e/0xc0
[ 950.859315] ? sched_clock+0x9/0x10
[ 950.859319] ? sched_clock_cpu+0x13/0x120
[ 950.859323] SyS_ioctl+0x4e/0x80
[ 950.859326] do_fast_syscall_32+0x75/0x250
[ 950.859331] ? irq_exit+0x4f/0xb0
[ 950.859334] entry_SYSENTER_32+0x47/0x71
[ 950.859338] EIP: 0xb7f81d11
[ 950.859339] EFLAGS: 00000296 CPU: 2
[ 950.859340] EAX: ffffffda EBX: 00000003 ECX: 40406469 EDX: bfde4c20
[ 950.859340] ESI: 00000003 EDI: 40406469 EBP: 00000003 ESP: bfde4b38
[ 950.859341] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[ 950.859343] Code: e8 30 60 01 00 83 c4 10 83 c3 04 39 f3 75 e0 8b 45 d8 8b 80 14 37 00 00 85 c0 74 13 68 dd 33 e4 c0 68 49 6f e3 c0 e8 4a 55 be ff <0f> ff 5e 5f b8 fe ff ff 3f bb 0a 00 00 00 e8 b7 14 c4 ff 8b 15
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 2 --
drivers/gpu/drm/i915/intel_engine_cs.c | 6 ++----
2 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index e89496aec857..5f04c790e30e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3560,9 +3560,7 @@ int i915_gem_wait_for_idle(struct drm_i915_private *i915, unsigned int flags)
if (ret)
return ret;
}
-
i915_gem_retire_requests(i915);
- GEM_BUG_ON(i915->gt.active_requests);
ret = wait_for_engines(i915);
} else {
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index aad353195f17..510e0bc3a377 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1513,10 +1513,8 @@ bool intel_engines_are_idle(struct drm_i915_private *dev_priv)
struct intel_engine_cs *engine;
enum intel_engine_id id;
- if (READ_ONCE(dev_priv->gt.active_requests))
- return false;
-
- /* If the driver is wedged, HW state may be very inconsistent and
+ /*
+ * If the driver is wedged, HW state may be very inconsistent and
* report that it is still busy, even though we have stopped using it.
*/
if (i915_terminally_wedged(&dev_priv->gpu_error))
--
2.15.1
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