Unbind the vma may happen at any time, outside of the normal GT wakeref.
As such it relies on having a wakeref of its own. However, we can forgo
clearing the register whilst the device is asleep and just mark it as
unused - so that when we do wake up the device, we will clear the unused
fence register (see i915_gem_restore_fences).
[22423.944631] WARNING: CPU: 3 PID: 26178 at drivers/gpu/drm/i915/intel_drv.h:1739 i915_vma_put_fence+0xf3/0x100 [i915]
[22423.946053] RPM wakelock ref not held during HW access
[22423.946056] Modules linked in: vgem(E) i915(E) nls_ascii(E) nls_cp437(E) vfat(E) fat(E) x86_pkg_temp_thermal(E) crct10dif_pclmul(E) crc32_pclmul(E) crc32c_intel(E) ghash_clmulni_intel(E) intel_gtt(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) evdev(E) aesni_intel(E) aes_x86_64(E) crypto_simd(E) cryptd(E) glue_helper(E) sysimgblt(E) fb_sys_fops(E) prime_numbers(E) drm(E) efivars(E) mei_me(E) lpc_ich(E) mei(E) mfd_core(E) battery(E) video(E) acpi_pad(E) button(E) tpm_tis(E) tpm_tis_core(E) tpm(E) autofs4(E) i2c_i801(E) thermal(E) fan(E) i2c_designware_platform(E) i2c_designware_core(E)
[22423.946438] CPU: 2 PID: 26178 Comm: gem_concurrent_ Tainted: G E 4.10.0+ #101
[22423.946513] Hardware name: ��������������������������������� ���������������������������������/���������������������������������, BIOS RYBDWi35.86A.0246.2
[22423.946600] Call Trace:
[22423.946641] dump_stack+0x68/0x9f
[22423.946703] __warn+0x107/0x130
[22423.946763] warn_slowpath_fmt+0xa8/0xe0
[22423.946825] ? __warn+0x130/0x130
[22423.946868] ? free_hot_cold_page_list+0x53/0x70
[22423.946942] ? mark_lock+0xcc/0x7f0
[22423.946997] ? __lock_is_held+0x84/0x100
[22423.947115] ? i915_vma_put_fence+0x64/0x100 [i915]
[22423.947224] i915_vma_put_fence+0xf3/0x100 [i915]
[22423.947335] i915_vma_unbind+0x4da/0x560 [i915]
[22423.947387] ? rb_erase+0x812/0x8a0
[22423.947439] ? kfree+0xa2/0xd0
[22423.947562] i915_vma_close+0x159/0x180 [i915]
[22423.947674] intel_ring_free+0x31/0x50 [i915]
[22423.947776] i915_gem_context_free+0x1ff/0x3d0 [i915]
[22423.947887] context_close+0x106/0x110 [i915]
[22423.947989] context_idr_cleanup+0xc/0x10 [i915]
[22423.948041] idr_for_each+0x14d/0x1d0
[22423.948158] ? context_close+0x110/0x110 [i915]
[22423.948206] ? get_from_free_list+0x70/0x70
[22423.948261] ? __lock_is_held+0x84/0x100
[22423.948325] ? __mutex_unlock_slowpath+0xd4/0x400
[22423.948448] i915_gem_context_close+0x4b/0x90 [i915]
[22423.948544] i915_driver_preclose+0x28/0x50 [i915]
[22423.948620] drm_release+0x175/0x690 [drm]
[22423.948681] ? fcntl_setlk+0x5e0/0x5e0
[22423.948746] __fput+0x17d/0x300
[22423.948807] ____fput+0x9/0x10
[22423.948859] task_work_run+0xa7/0xe0
[22423.948924] do_exit+0x4d2/0x13e0
[22423.948986] ? mm_update_next_owner+0x320/0x320
[22423.949051] ? __do_page_fault+0x209/0x5c0
[22423.949110] ? mark_held_locks+0x23/0xc0
[22423.949166] ? entry_SYSCALL_64_fastpath+0x5/0xb1
[22423.949232] do_group_exit+0x93/0x160
[22423.949289] SyS_exit_group+0x18/0x20
[22423.949350] entry_SYSCALL_64_fastpath+0x1c/0xb1
[22423.949403] RIP: 0033:0x7f9cc2e154c8
[22423.949484] RSP: 002b:00007ffd7e81b448 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[22423.949557] RAX: ffffffffffffffda RBX: ffffffff810ef1f0 RCX: 00007f9cc2e154c8
[22423.949617] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[22423.949677] RBP: ffff880367e9ff98 R08: 00000000000000e7 R09: ffffffffffffff88
[22423.949741] R10: 00007f9cc1d5c000 R11: 0000000000000246 R12: 00007f9cc30f6c30
[22423.949798] R13: 0000000000000000 R14: 00007f9cc30f6c20 R15: 0000000000000003
[22423.949868] ? trace_hardirqs_off_caller+0xc0/0x110
v2: Move the rpm check down a layer so that we still perform the
vma/fence update required for the deferred mmio write on resume.
v3: Don't touch i915_gem_object_set_cache_level() and leave the rpm to
the low level routines (such as i915_vma_put_fence).
v4: vma may be null in fence_write, so extract drm_i915_private from
fence->i915
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_fence_reg.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_fence_reg.c b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
index fadbe8f4c745..5fe2cd8c8f28 100644
--- a/drivers/gpu/drm/i915/i915_gem_fence_reg.c
+++ b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
@@ -248,7 +248,14 @@ static int fence_update(struct drm_i915_fence_reg *fence,
list_move(&fence->link, &fence->i915->mm.fence_list);
}
- fence_write(fence, vma);
+ /* We only need to update the register itself if the device is awake.
+ * If the device is currently powered down, we will defer the write
+ * to the runtime resume, see i915_gem_restore_fences().
+ */
+ if (intel_runtime_pm_get_if_in_use(fence->i915)) {
+ fence_write(fence, vma);
+ intel_runtime_pm_put(fence->i915);
+ }
if (vma) {
if (fence->vma != vma) {
@@ -278,8 +285,6 @@ i915_vma_put_fence(struct i915_vma *vma)
{
struct drm_i915_fence_reg *fence = vma->fence;
- assert_rpm_wakelock_held(vma->vm->i915);
-
if (!fence)
return 0;
--
2.11.0
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