[Intel-gfx] [PATCH] drm/i915/pxp: Hold RPM wakelock during PXP unbind

[Daniele Ceraolo Spurio]

On 12/20/2021 12:40 PM, Juston Li wrote:
> Similar to commit b8d8436840ca ("drm/i915/gt: Hold RPM wakelock during
> PXP suspend") but to fix the same warning for unbind during shutdown:
>
> ------------[ cut here ]------------
> RPM wakelock ref not held during HW access
> WARNING: CPU: 0 PID: 4139 at drivers/gpu/drm/i915/intel_runtime_pm.h:115
> gen12_fwtable_write32+0x1b7/0
> Modules linked in: 8021q ccm rfcomm cmac algif_hash algif_skcipher
> af_alg uinput snd_hda_codec_hdmi vf industrialio iwl7000_mac80211
> cros_ec_sensorhub lzo_rle lzo_compress zram iwlwifi cfg80211 joydev
> CPU: 0 PID: 4139 Comm: halt Tainted: G     U  W
> 5.10.84 #13 344e11e079c4a03940d949e537eab645f6
> RIP: 0010:gen12_fwtable_write32+0x1b7/0x200
> Code: 48 c7 c7 fc b3 b5 89 31 c0 e8 2c f3 ad ff 0f 0b e9 04 ff ff ff c6
> 05 71 e9 1d 01 01 48 c7 c7 d67
> RSP: 0018:ffffa09ec0bb3bb0 EFLAGS: 00010246
> RAX: 12dde97bbd260300 RBX: 00000000000320f0 RCX: ffffffff89e60ea0
> RDX: 0000000000000000 RSI: 00000000ffffdfff RDI: ffffffff89e60e70
> RBP: ffffa09ec0bb3bd8 R08: 0000000000000000 R09: ffffa09ec0bb3950
> R10: 00000000ffffdfff R11: ffffffff89e91160 R12: 0000000000000000
> R13: 0000000028121969 R14: ffff9515c32f0990 R15: 0000000040000000
> FS:  0000790dcf225740(0000) GS:ffff951737800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000058b25efae147 CR3: 0000000133ea6001 CR4: 0000000000770ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
>   intel_pxp_fini_hw+0x2f/0x39
>   i915_pxp_tee_component_unbind+0x1c/0x42
>   component_unbind+0x32/0x48
>   component_unbind_all+0x80/0x9d
>   take_down_master+0x24/0x36
>   component_master_del+0x56/0x70
>   mei_pxp_remove+0x2c/0x68
>   mei_cl_device_remove+0x35/0x68
>   device_release_driver_internal+0x100/0x1a1
>   mei_cl_bus_remove_device+0x21/0x79
>   mei_cl_bus_remove_devices+0x3b/0x51
>   mei_stop+0x3b/0xae
>   mei_me_shutdown+0x23/0x58
>   device_shutdown+0x144/0x1d3
>   kernel_power_off+0x13/0x4c
>   __se_sys_reboot+0x1d4/0x1e9
>   do_syscall_64+0x43/0x55
>   entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x790dcf316273
> Code: 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00
> 00 89 fa be 69 19 12 28 bf ad8
> RSP: 002b:00007ffca0df9198 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9
> RAX: ffffffffffffffda RBX: 000000004321fedc RCX: 0000790dcf316273
> RDX: 000000004321fedc RSI: 0000000028121969 RDI: 00000000fee1dead
> RBP: 00007ffca0df9200 R08: 0000000000000007 R09: 0000563ce8cd8970
> R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffca0df9308
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000003
> ---[ end trace 2f501b01b348f114 ]---
> ACPI: Preparing to enter system sleep state S5
> reboot: Power down
>
> Fixes: 0cfab4cb3c4e ("drm/i915/pxp: Enable PXP power management")
> Suggested-by: Lee Shawn C <shawn.c.lee at intel.com>
> Signed-off-by: Juston Li <juston.li at intel.com>

Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>

Can you send it to trybot 
(https://lists.freedesktop.org/mailman/listinfo/intel-gfx-trybot) with 
an added change to turn on the PXP config (see below), so we can get a 
CI run on it with PXP enabled?

--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -48,6 +48,8 @@  config DRM_I915_DEBUG
      select DRM_I915_DEBUG_RUNTIME_PM
      select DRM_I915_SW_FENCE_DEBUG_OBJECTS
      select DRM_I915_SELFTEST
+    select INTEL_MEI_PXP
+    select DRM_I915_PXP
      select BROKEN # for prototype uAPI
      default n
      help

Thanks,
Daniele

> ---
>   drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> index 49508f31dcb7..d2980370d929 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
> @@ -103,9 +103,12 @@ static int i915_pxp_tee_component_bind(struct device *i915_kdev,
>   static void i915_pxp_tee_component_unbind(struct device *i915_kdev,
>   					  struct device *tee_kdev, void *data)
>   {
> +	struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
>   	struct intel_pxp *pxp = i915_dev_to_pxp(i915_kdev);
> +	intel_wakeref_t wakeref;
>   
> -	intel_pxp_fini_hw(pxp);
> +	with_intel_runtime_pm_if_in_use(&i915->runtime_pm, wakeref)
> +		intel_pxp_fini_hw(pxp);
>   
>   	mutex_lock(&pxp->tee_mutex);
>   	pxp->pxp_component = NULL;