"Zanoni, Paulo R" <paulo.r.zanoni@xxxxxxxxx> writes:
> Hi
>
> Em Sex, 2016-09-09 às 14:11 +0100, Chris Wilson escreveu:
>> In the next patch we want to handle reset directly by a locked waiter
>> in
>> order to avoid issues with returning before the reset is handled. To
>> handle the reset, we must first know whether we hold the
>> struct_mutex.
>> If we do not hold the struct_mtuex we can not perform the reset, but
>> we do
>> not block the reset worker either (and so we can just continue to
>> wait for
>> request completion) - otherwise we must relinquish the mutex.
>>
>> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
>> Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
>> ---
>> drivers/gpu/drm/i915/i915_debugfs.c | 4 +++-
>> drivers/gpu/drm/i915/i915_gem.c | 7 +++++--
>> drivers/gpu/drm/i915/i915_gem_evict.c | 8 ++++++--
>> drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
>> drivers/gpu/drm/i915/i915_gem_request.c | 15 ++++++++++++---
>> drivers/gpu/drm/i915/i915_gem_request.h | 11 ++++++++---
>> drivers/gpu/drm/i915/i915_gem_shrinker.c | 2 +-
>> drivers/gpu/drm/i915/intel_ringbuffer.c | 3 ++-
>> 8 files changed, 38 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
>> b/drivers/gpu/drm/i915/i915_debugfs.c
>> index 620e7daa133b..64702cc68e3a 100644
>> --- a/drivers/gpu/drm/i915/i915_debugfs.c
>> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
>> @@ -4803,7 +4803,9 @@ i915_drop_caches_set(void *data, u64 val)
>> return ret;
>>
>> if (val & DROP_ACTIVE) {
>> - ret = i915_gem_wait_for_idle(dev_priv,
>> I915_WAIT_INTERRUPTIBLE);
>> + ret = i915_gem_wait_for_idle(dev_priv,
>> + I915_WAIT_INTERRUPTIBLE
>> |
>> + I915_WAIT_LOCKED);
>> if (ret)
>> goto unlock;
>> }
>> diff --git a/drivers/gpu/drm/i915/i915_gem.c
>> b/drivers/gpu/drm/i915/i915_gem.c
>> index 4617250c3000..23069a2d2850 100644
>> --- a/drivers/gpu/drm/i915/i915_gem.c
>> +++ b/drivers/gpu/drm/i915/i915_gem.c
>> @@ -2802,7 +2802,8 @@ __i915_gem_object_sync(struct
>> drm_i915_gem_request *to,
>>
>> if (!i915.semaphores) {
>> ret = i915_wait_request(from,
>> - from->i915-
>> >mm.interruptible,
>> + from->i915->mm.interruptible
>> |
>> + I915_WAIT_LOCKED,
>> NULL,
>> NO_WAITBOOST);
>> if (ret)
>> @@ -4304,7 +4305,9 @@ int i915_gem_suspend(struct drm_device *dev)
>> if (ret)
>> goto err;
>>
>> - ret = i915_gem_wait_for_idle(dev_priv,
>> I915_WAIT_INTERRUPTIBLE);
>> + ret = i915_gem_wait_for_idle(dev_priv,
>> + I915_WAIT_INTERRUPTIBLE |
>> + I915_WAIT_LOCKED);
>> if (ret)
>> goto err;
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c
>> b/drivers/gpu/drm/i915/i915_gem_evict.c
>> index 103085246975..5b6f81c1dbca 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_evict.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_evict.c
>> @@ -170,7 +170,9 @@ search_again:
>> if (ret)
>> return ret;
>>
>> - ret = i915_gem_wait_for_idle(dev_priv,
>> I915_WAIT_INTERRUPTIBLE);
>> + ret = i915_gem_wait_for_idle(dev_priv,
>> + I915_WAIT_INTERRUPTIBLE |
>> + I915_WAIT_LOCKED);
>> if (ret)
>> return ret;
>>
>> @@ -275,7 +277,9 @@ int i915_gem_evict_vm(struct i915_address_space
>> *vm, bool do_idle)
>> return ret;
>> }
>>
>> - ret = i915_gem_wait_for_idle(dev_priv,
>> I915_WAIT_INTERRUPTIBLE);
>> + ret = i915_gem_wait_for_idle(dev_priv,
>> + I915_WAIT_INTERRUPTIBLE
>> |
>> + I915_WAIT_LOCKED);
>> if (ret)
>> return ret;
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
>> b/drivers/gpu/drm/i915/i915_gem_gtt.c
>> index 9bcac52b8268..f3c6876da521 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
>> @@ -2683,7 +2683,7 @@ void i915_gem_gtt_finish_object(struct
>> drm_i915_gem_object *obj)
>> struct i915_ggtt *ggtt = &dev_priv->ggtt;
>>
>> if (unlikely(ggtt->do_idle_maps)) {
>> - if (i915_gem_wait_for_idle(dev_priv, 0)) {
>> + if (i915_gem_wait_for_idle(dev_priv,
>> I915_WAIT_LOCKED)) {
>> DRM_ERROR("Failed to wait for idle; VT'd may
>> hang.\n");
>> /* Wait a bit, in hopes it avoids the hang
>> */
>> udelay(10);
>> diff --git a/drivers/gpu/drm/i915/i915_gem_request.c
>> b/drivers/gpu/drm/i915/i915_gem_request.c
>> index f4c15f319d08..5f89801e6a16 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_request.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_request.c
>> @@ -260,7 +260,9 @@ static int i915_gem_init_seqno(struct
>> drm_i915_private *dev_priv, u32 seqno)
>>
>> /* Carefully retire all requests without writing to the
>> rings */
>> for_each_engine(engine, dev_priv) {
>> - ret = intel_engine_idle(engine,
>> I915_WAIT_INTERRUPTIBLE);
>> + ret = intel_engine_idle(engine,
>> + I915_WAIT_INTERRUPTIBLE |
>> + I915_WAIT_LOCKED);
>> if (ret)
>> return ret;
>> }
>> @@ -625,6 +627,10 @@ int i915_wait_request(struct
>> drm_i915_gem_request *req,
>> int ret = 0;
>>
>> might_sleep();
>> +#if IS_ENABLED(CONFIG_LOCKDEP)
>> + GEM_BUG_ON(!!lockdep_is_held(&req->i915->drm.struct_mutex)
>> !=
>> + !!(flags & I915_WAIT_LOCKED));
>> +#endif
>
> I'm hitting this on my SKL. It usually happens right after the login,
> when I click the terminal icon on the toolbar in order to open it (on
> Cinnamon). When it doesn't happen at that time, I just open a browser
> and browse for like 30 seconds until it happens.
>
> I did manual reverts of this series up to this patch and obviously the
> problem goes away (no more GEM_BUG_ON to hit). I didn't try to do a
> real bisect to check if this is the first bad commit or if it's
> something later on the series. It could even be an older problem that
> just got exposed by the new BUG(). I'm available to test patches, just
> send them to me.
No patches yet but there is a comment on
intel_prepare_plane_fb() that says that it must be called with mutex
held.
Quite likely the new GEM_BUG_ON catches this not being true.
-Mika
>
> Here's the backtrace:
>
> [ 71.341272] ------------[ cut here ]------------
> [ 71.341305] kernel BUG at
> drivers/gpu/drm/i915/i915_gem_request.c:763!
> [ 71.341331] invalid opcode: 0000 [#1] SMP
> [ 71.341348] Modules linked in: snd_hda_codec_hdmi
> snd_hda_codec_realtek snd_hda_codec_generic snd_soc_skl snd_soc_skl_ipc
> snd_soc_sst_match snd_hda_ext_core snd_soc_sst_dsp snd_soc_sst_ipc
> nls_utf8 nls_cp437 vfat fat efi_pstore efivars iwlmvm sg snd_hda_intel
> i915 iwlwifi snd_hda_codec snd_hwdep snd_hda_core drm_kms_helper idma64
> virt_dma syscopyarea sysfillrect sysimgblt fb_sys_fops drm
> intel_lpss_pci intel_pch_thermal wmi intel_lpss_acpi intel_lpss
> intel_hid acpi_pad sparse_keymap sdhci_pci pinctrl_sunrisepoint
> pinctrl_intel
> [ 71.341608] CPU: 3 PID: 3025 Comm: Xorg Tainted:
> G U 4.8.0-rc5pz+ #52
> [ 71.341637] Hardware name: Intel Corporation Skylake Client
> platform/Skylake Y LPDDR3 RVP3, BIOS SKLSE2R1.86C.B074.R00.1502240607
> 02/24/2015
> [ 71.341684] task: ffff880165006140 task.stack: ffff880164394000
> [ 71.341708] RIP: 0010:[<ffffffffa01d0377>] [<ffffffffa01d0377>]
> i915_wait_request+0x417/0x8e0 [i915]
> [ 71.341775] RSP: 0018:ffff880164397928 EFLAGS: 00010202
> [ 71.341795] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
> ffffffffffffffff
> [ 71.341821] RDX: 0000000000000401 RSI: ffff8801658900d0 RDI:
> ffff8801650068d8
> [ 71.341849] RBP: ffff8801643979d8 R08: 0000000000000003 R09:
> 0000000000000000
> [ 71.341875] R10: 0000000000000001 R11: 0000000000000000 R12:
> 0000000000000001
> [ 71.341913] R13: 0000000000000000 R14: 0000000000000001 R15:
> ffff880159b125c0
> [ 71.341940] FS: 00007fa4922eca40(0000) GS:ffff88016d4c0000(0000)
> knlGS:0000000000000000
> [ 71.341970] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 71.341992] CR2: 0000560b99a07000 CR3: 00000001641eb000 CR4:
> 00000000003406e0
> [ 71.342019] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 71.342046] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 71.342073] Stack:
> [ 71.342083] 0000000000000046 0000000000000004 ffff880100000020
> ffffffff827b40e0
> [ 71.342122] ffffffffffffffff ffff880165006888 0000000000000001
> 0000000000000000
> [ 71.342156] ffff880165006140 ffffffff810d5560 ffff880164397978
> ffff880164397978
> [ 71.342190] Call Trace:
> [ 71.342205] [<ffffffff810d5560>] ? prepare_to_wait_event+0xf0/0xf0
> [ 71.342267] [<ffffffffa01d0898>] i915_fence_wait+0x58/0xb0 [i915]
> [ 71.342294] [<ffffffff8155e6cf>] fence_wait_timeout+0x8f/0x2a0
> [ 71.342317] [<ffffffff815601cc>]
> reservation_object_wait_timeout_rcu+0x1bc/0x570
> [ 71.342346] [<ffffffff815600af>] ?
> reservation_object_wait_timeout_rcu+0x9f/0x570
> [ 71.342399] [<ffffffffa0218fca>] intel_prepare_plane_fb+0xca/0x2f0
> [i915]
> [ 71.342426] [<ffffffff81121247>] ? __module_address+0x27/0xf0
> [ 71.342455] [<ffffffffa00e3521>]
> drm_atomic_helper_prepare_planes+0x61/0xf0 [drm_kms_helper]
> [ 71.342510] [<ffffffffa02115ae>] intel_atomic_commit+0x25e/0x4e0
> [i915]
> [ 71.342549] [<ffffffffa00929d2>] drm_atomic_commit+0x52/0x60 [drm]
> [ 71.342592] [<ffffffffa00e4487>]
> drm_atomic_helper_update_plane+0xe7/0x130 [drm_kms_helper]
> [ 71.342633] [<ffffffffa0084e19>] __setplane_internal+0x1b9/0x2a0
> [drm]
> [ 71.342667] [<ffffffffa0085017>]
> drm_mode_cursor_universal+0x117/0x200 [drm]
> [ 71.342703] [<ffffffffa0085184>] drm_mode_cursor_common+0x84/0x180
> [drm]
> [ 71.342738] [<ffffffffa0086a99>] drm_mode_cursor2_ioctl+0x9/0x10
> [drm]
> [ 71.342793] [<ffffffffa007be49>] drm_ioctl+0x389/0x4e0 [drm]
> [ 71.342823] [<ffffffffa0086a90>] ? drm_mode_cursor_ioctl+0x40/0x40
> [drm]
> [ 71.342850] [<ffffffff8124ea49>] ? mntput_no_expire+0x89/0x3c0
> [ 71.342873] [<ffffffff8124e9c0>] ? mnt_get_count+0x60/0x60
> [ 71.342896] [<ffffffff8123e81f>] do_vfs_ioctl+0x8f/0x690
> [ 71.342926] [<ffffffff810ad784>] ? task_work_run+0x94/0xb0
> [ 71.342948] [<ffffffff810df24d>] ?
> trace_hardirqs_on_caller+0xed/0x1b0
> [ 71.342974] [<ffffffff8123ee94>] SyS_ioctl+0x74/0x80
> [ 71.342995] [<ffffffff8193f8e5>]
> entry_SYSCALL_64_fastpath+0x18/0xa8
> [ 71.343019] Code: f0 e0 48 85 db 74 18 48 8b 03 48 8b 7b 08 48 83 c3
> 18 4c 89 fe ff d0 48 8b 03 48 85 c0 75 eb 65 ff 0d 5e c1 e3 5f e9 3a fe
> ff ff <0f> 0b 65 48 8b 04 25 40 c5 00 00 48 c7 80 a8 11 00 00 79 03 1d
> [ 71.343195] RIP [<ffffffffa01d0377>] i915_wait_request+0x417/0x8e0
> [i915]
> [ 71.343246] RSP <ffff880164397928>
> [ 71.366786] ---[ end trace 715dbae717d2187f ]---
>
> Remember that this makes the desktop 100% unusable.
>
> Thanks,
> Paulo
>
>>
>> if (i915_gem_request_completed(req))
>> return 0;
>> @@ -667,7 +673,8 @@ int i915_wait_request(struct drm_i915_gem_request
>> *req,
>> goto complete;
>>
>> set_current_state(state);
>> - add_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
>> + if (flags & I915_WAIT_LOCKED)
>> + add_wait_queue(&req->i915->gpu_error.wait_queue,
>> &reset);
>>
>> intel_wait_init(&wait, req->fence.seqno);
>> if (intel_engine_add_wait(req->engine, &wait))
>> @@ -707,10 +714,12 @@ wakeup:
>> if (i915_spin_request(req, state, 2))
>> break;
>> }
>> - remove_wait_queue(&req->i915->gpu_error.wait_queue, &reset);
>>
>> intel_engine_remove_wait(req->engine, &wait);
>> + if (flags & I915_WAIT_LOCKED)
>> + remove_wait_queue(&req->i915->gpu_error.wait_queue,
>> &reset);
>> __set_current_state(TASK_RUNNING);
>> +
>> complete:
>> trace_i915_gem_request_wait_end(req);
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem_request.h
>> b/drivers/gpu/drm/i915/i915_gem_request.h
>> index 479896ef791e..def35721e9ed 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_request.h
>> +++ b/drivers/gpu/drm/i915/i915_gem_request.h
>> @@ -222,7 +222,8 @@ int i915_wait_request(struct drm_i915_gem_request
>> *req,
>> s64 *timeout,
>> struct intel_rps_client *rps)
>> __attribute__((nonnull(1)));
>> -#define I915_WAIT_INTERRUPTIBLE BIT(0)
>> +#define I915_WAIT_INTERRUPTIBLE BIT(0)
>> +#define I915_WAIT_LOCKED BIT(1) /* struct_mutex held, handle
>> GPU reset */
>>
>> static inline u32 intel_engine_get_seqno(struct intel_engine_cs
>> *engine);
>>
>> @@ -576,7 +577,9 @@ i915_gem_active_wait(const struct i915_gem_active
>> *active, struct mutex *mutex)
>> if (!request)
>> return 0;
>>
>> - return i915_wait_request(request, I915_WAIT_INTERRUPTIBLE,
>> NULL, NULL);
>> + return i915_wait_request(request,
>> + I915_WAIT_INTERRUPTIBLE |
>> I915_WAIT_LOCKED,
>> + NULL, NULL);
>> }
>>
>> /**
>> @@ -639,7 +642,9 @@ i915_gem_active_retire(struct i915_gem_active
>> *active,
>> if (!request)
>> return 0;
>>
>> - ret = i915_wait_request(request, I915_WAIT_INTERRUPTIBLE,
>> NULL, NULL);
>> + ret = i915_wait_request(request,
>> + I915_WAIT_INTERRUPTIBLE |
>> I915_WAIT_LOCKED,
>> + NULL, NULL);
>> if (ret)
>> return ret;
>>
>> diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c
>> b/drivers/gpu/drm/i915/i915_gem_shrinker.c
>> index 35a05f4c51c1..1c237d02f30b 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
>> @@ -414,7 +414,7 @@ i915_gem_shrinker_vmap(struct notifier_block *nb,
>> unsigned long event, void *ptr
>> return NOTIFY_DONE;
>>
>> /* Force everything onto the inactive lists */
>> - ret = i915_gem_wait_for_idle(dev_priv, 0);
>> + ret = i915_gem_wait_for_idle(dev_priv, I915_WAIT_LOCKED);
>> if (ret)
>> goto out;
>>
>> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
>> b/drivers/gpu/drm/i915/intel_ringbuffer.c
>> index a5bf18877068..8687a84a7ff3 100644
>> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
>> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
>> @@ -2223,7 +2223,8 @@ static int wait_for_space(struct
>> drm_i915_gem_request *req, int bytes)
>> if (WARN_ON(&target->ring_link == &ring->request_list))
>> return -ENOSPC;
>>
>> - ret = i915_wait_request(target, I915_WAIT_INTERRUPTIBLE,
>> + ret = i915_wait_request(target,
>> + I915_WAIT_INTERRUPTIBLE |
>> I915_WAIT_LOCKED,
>> NULL, NO_WAITBOOST);
>> if (ret)
>> return ret;
> _______________________________________________
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