Re: [PATCH V4] drm/i915/gt: Hold RPM wakelock during PXP suspend

Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx> · Mon, 22 Nov 2021 08:56:08 -0800

On 11/18/2021 11:35 AM, Daniele Ceraolo Spurio wrote:


On 11/16/2021 10:03 PM, Tejas Upadhyay wrote:
selftest --r live shows failure in suspend tests when
RPM wakelock is not acquired during suspend.

This changes addresses below error :
<4> [154.177535] RPM wakelock ref not held during HW access
<4> [154.177575] WARNING: CPU: 4 PID: 5772 at
drivers/gpu/drm/i915/intel_runtime_pm.h:113
fwtable_write32+0x240/0x320 [i915]
<4> [154.177974] Modules linked in: i915(+) vgem drm_shmem_helper
fuse snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic
ledtrig_audio mei_hdcp mei_pxp x86_pkg_temp_thermal coretemp
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_intel_dspcfg
snd_hda_codec snd_hwdep igc snd_hda_core ttm mei_me ptp
snd_pcm prime_numbers mei i2c_i801 pps_core i2c_smbus intel_lpss_pci
btusb btrtl btbcm btintel bluetooth ecdh_generic ecc [last unloaded: 
i915]
<4> [154.178143] CPU: 4 PID: 5772 Comm: i915_selftest Tainted: G
U            5.15.0-rc6-CI-Patchwork_21432+ #1
<4> [154.178154] Hardware name: ASUS System Product Name/TUF GAMING
Z590-PLUS WIFI, BIOS 0811 04/06/2021
<4> [154.178160] RIP: 0010:fwtable_write32+0x240/0x320 [i915]
<4> [154.178604] Code: 15 7b e1 0f 0b e9 34 fe ff ff 80 3d a9 89 31
00 00 0f 85 31 fe ff ff 48 c7 c7 88 9e 4f a0 c6 05 95 89 31 00 01 e8
c0 15 7b e1 <0f> 0b e9 17 fe ff ff 8b 05 0f 83 58 e2 85 c0 0f 85 8d
00 00 00 48
<4> [154.178614] RSP: 0018:ffffc900016279f0 EFLAGS: 00010286
<4> [154.178626] RAX: 0000000000000000 RBX: ffff888204fe0ee0
RCX: 0000000000000001
<4> [154.178634] RDX: 0000000080000001 RSI: ffffffff823142b5
RDI: 00000000ffffffff
<4> [154.178641] RBP: 00000000000320f0 R08: 0000000000000000
R09: c0000000ffffcd5a
<4> [154.178647] R10: 00000000000f8c90 R11: ffffc90001627808
R12: 0000000000000000
<4> [154.178654] R13: 0000000040000000 R14: ffffffffa04d12e0
R15: 0000000000000000
<4> [154.178660] FS:  00007f7390aa4c00(0000) GS:ffff88844f000000(0000)
knlGS:0000000000000000
<4> [154.178669] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [154.178675] CR2: 000055bc40595028 CR3: 0000000204474005
CR4: 0000000000770ee0
<4> [154.178682] PKRU: 55555554
<4> [154.178687] Call Trace:
<4> [154.178706]  intel_pxp_fini_hw+0x23/0x30 [i915]
<4> [154.179284]  intel_pxp_suspend+0x1f/0x30 [i915]
<4> [154.179807]  live_gt_resume+0x5b/0x90 [i915]

Changes since V2 :
    - Remove boolean in intel_pxp_runtime_preapre for
      non-pxp configs. Solves build error
Changes since V2 :
    - Open-code intel_pxp_runtime_suspend - Daniele
    - Remove boolean in intel_pxp_runtime_preapre - Daniele
Changes since V1 :
    - split the HW access parts in gt_suspend_late - Daniele
    - Remove default PXP configs


Just realized this is also missing a fixes tag:

Fixes: 0cfab4cb3c4e ("drm/i915/pxp: Enable PXP power management")

Daniele

Signed-off-by: Tejas Upadhyay 
<tejaskumarx.surendrakumar.upadhyay@xxxxxxxxx>

Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>

Can you send a trybot with the PXP config enabled before we merge 
this, just to make sure the issue is gone?

Thanks,
Daniele

---
  drivers/gpu/drm/i915/gt/intel_gt_pm.c   |  7 +++--
  drivers/gpu/drm/i915/pxp/intel_pxp_pm.c | 37 +++++++++++++++++--------
  drivers/gpu/drm/i915/pxp/intel_pxp_pm.h | 19 +++++++++++--
  3 files changed, 46 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c 
b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index b4a8594bc46c..c0fa41e4c803 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -303,7 +303,7 @@ void intel_gt_suspend_prepare(struct intel_gt *gt)
      user_forcewake(gt, true);
      wait_for_suspend(gt);
  -    intel_pxp_suspend(&gt->pxp, false);
+    intel_pxp_suspend_prepare(&gt->pxp);
  }
    static suspend_state_t pm_suspend_target(void)
@@ -328,6 +328,7 @@ void intel_gt_suspend_late(struct intel_gt *gt)
      GEM_BUG_ON(gt->awake);
        intel_uc_suspend(&gt->uc);
+    intel_pxp_suspend(&gt->pxp);
        /*
       * On disabling the device, we want to turn off HW access to 
memory
@@ -355,7 +356,7 @@ void intel_gt_suspend_late(struct intel_gt *gt)
    void intel_gt_runtime_suspend(struct intel_gt *gt)
  {
-    intel_pxp_suspend(&gt->pxp, true);
+    intel_pxp_runtime_suspend(&gt->pxp);
      intel_uc_runtime_suspend(&gt->uc);
        GT_TRACE(gt, "\n");
@@ -373,7 +374,7 @@ int intel_gt_runtime_resume(struct intel_gt *gt)
      if (ret)
          return ret;
  -    intel_pxp_resume(&gt->pxp);
+    intel_pxp_runtime_resume(&gt->pxp);
        return 0;
  }
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c 
b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
index 23fd86de5a24..6a7d4e2ee138 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
@@ -7,26 +7,29 @@
  #include "intel_pxp_irq.h"
  #include "intel_pxp_pm.h"
  #include "intel_pxp_session.h"
+#include "i915_drv.h"
  -void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime)
+void intel_pxp_suspend_prepare(struct intel_pxp *pxp)
  {
      if (!intel_pxp_is_enabled(pxp))
          return;
        pxp->arb_is_valid = false;
  -    /*
-     * Contexts using protected objects keep a runtime PM reference, 
so we
-     * can only runtime suspend when all of them have been either 
closed
-     * or banned. Therefore, there is no need to invalidate in that
-     * scenario.
-     */
-    if (!runtime)
-        intel_pxp_invalidate(pxp);
+    intel_pxp_invalidate(pxp);
+}
  -    intel_pxp_fini_hw(pxp);
+void intel_pxp_suspend(struct intel_pxp *pxp)
+{
+    intel_wakeref_t wakeref;
  -    pxp->hw_state_invalidated = false;
+    if (!intel_pxp_is_enabled(pxp))
+        return;
+
+ with_intel_runtime_pm(&pxp_to_gt(pxp)->i915->runtime_pm, wakeref) {
+        intel_pxp_fini_hw(pxp);
+        pxp->hw_state_invalidated = false;
+    }
  }
    void intel_pxp_resume(struct intel_pxp *pxp)
@@ -44,3 +47,15 @@ void intel_pxp_resume(struct intel_pxp *pxp)
        intel_pxp_init_hw(pxp);
  }
+
+void intel_pxp_runtime_suspend(struct intel_pxp *pxp)
+{
+    if (!intel_pxp_is_enabled(pxp))
+        return;
+
+    pxp->arb_is_valid = false;
+
+    intel_pxp_fini_hw(pxp);
+
+    pxp->hw_state_invalidated = false;
+}
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h 
b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
index c89e97a0c3d0..16990a3f2f85 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.h
@@ -9,16 +9,29 @@
  #include "intel_pxp_types.h"
    #ifdef CONFIG_DRM_I915_PXP
-void intel_pxp_suspend(struct intel_pxp *pxp, bool runtime);
+void intel_pxp_suspend_prepare(struct intel_pxp *pxp);
+void intel_pxp_suspend(struct intel_pxp *pxp);
  void intel_pxp_resume(struct intel_pxp *pxp);
+void intel_pxp_runtime_suspend(struct intel_pxp *pxp);
  #else
-static inline void intel_pxp_suspend(struct intel_pxp *pxp, bool 
runtime)
+static inline void intel_pxp_suspend_prepare(struct intel_pxp *pxp)
+{
+}
+
+static inline void intel_pxp_suspend(struct intel_pxp *pxp)
  {
  }
    static inline void intel_pxp_resume(struct intel_pxp *pxp)
  {
  }
-#endif
  +static inline void intel_pxp_runtime_suspend(struct intel_pxp *pxp)
+{
+}
+#endif
+static inline void intel_pxp_runtime_resume(struct intel_pxp *pxp)
+{
+    intel_pxp_resume(pxp);
+}
  #endif /* __INTEL_PXP_PM_H__ */








