Re: [PATCH v2 16/22] drm/msm/dpu: Configure CWB in writeback encoder

[Maxime Ripard]

On Tue, Oct 08, 2024 at 10:00:57AM GMT, Neil Armstrong wrote:
> Hi,
> 
> On 01/10/2024 09:37, neil.armstrong@xxxxxxxxxx wrote:
> > Hi,
> > 
> > On 30/09/2024 21:19, Jessica Zhang wrote:
> > > 
> > > 
> > > On 9/30/2024 7:17 AM, neil.armstrong@xxxxxxxxxx wrote:
> > > > On 25/09/2024 00:59, Jessica Zhang wrote:
> 
> <snip>
> 
> > > > 
> > > > When running igt-test on QRD8650, I get:
> > > > # IGT_FRAME_DUMP_PATH=$PWD FRAME_PNG_FILE_NAME=pwet /usr/libexec/igt- gpu-tools/kms_writeback -d
> > > 
> > > Hi Neil,
> > > 
> > > Thanks for reporting this. Unfortunately, I'm not able to recreate this on the MTP8650.
> > > 
> > > How many/which non-WB outputs are you testing with?
> > 
> > Here's the modetest output:
> > ==================><====================================================
> > Encoders:
> > id    crtc    type    possible crtcs    possible clones
> > 32    103    DSI    0x00000007    0x00000005
> > 34    0    TMDS    0x00000007    0x00000006
> > 37    0    Virtual    0x00000007    0x00000007
> > 
> > Connectors:
> > id    encoder    status        name        size (mm)    modes    encoders
> > 33    32    connected    DSI-1              71x157        1    32
> >    modes:
> >      index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
> >    #0 1080x2400 144.00 1080 1100 1102 1122 2400 2420 2422 2440 394225 flags: ; type: preferred, driver
> >    props:
> >      1 EDID:
> >          flags: immutable blob
> >          blobs:
> > 
> >          value:
> >      2 DPMS:
> >          flags: enum
> >          enums: On=0 Standby=1 Suspend=2 Off=3
> >          value: 0
> >      5 link-status:
> >          flags: enum
> >          enums: Good=0 Bad=1
> >          value: 0
> >      6 non-desktop:
> >          flags: immutable range
> >          values: 0 1
> >          value: 0
> >      4 TILE:
> >          flags: immutable blob
> >          blobs:
> > 
> >          value:
> > 35    0    disconnected    DP-1               0x0        0    34
> >    props:
> >      1 EDID:
> >          flags: immutable blob
> >          blobs:
> > 
> >          value:
> >      2 DPMS:
> >          flags: enum
> >          enums: On=0 Standby=1 Suspend=2 Off=3
> >          value: 0
> >      5 link-status:
> >          flags: enum
> >          enums: Good=0 Bad=1
> >          value: 0
> >      6 non-desktop:
> >          flags: immutable range
> >          values: 0 1
> >          value: 0
> >      4 TILE:
> >          flags: immutable blob
> >          blobs:
> > 
> >          value:
> >      36 subconnector:
> >          flags: immutable enum
> >          enums: Unknown=0 VGA=1 DVI-D=3 HDMI=11 DP=10 Wireless=18 Native=15
> >          value: 0
> > ==================><====================================================
> > 
> > and dri state:
> > ==================><====================================================
> > # cat /sys/kernel/debug/dri/0/state
> > plane[43]: plane-0
> >      crtc=crtc-0
> >      fb=106
> >          allocated by = [fbcon]
> >          refcount=2
> >          format=XR24 little-endian (0x34325258)
> >          modifier=0x0
> >          size=1080x2400
> >          layers:
> >              size[0]=1080x2400
> >              pitch[0]=4352
> >              offset[0]=0
> >              obj[0]:
> >                  name=0
> >                  refcount=1
> >                  start=0010102d
> >                  size=10444800
> >                  imported=no
> >      crtc-pos=1080x2400+0+0
> >      src-pos=1080.000000x2400.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=1
> >      sspp[0]=sspp_0
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=1080x2400+0+0
> >      dst[0]=1080x2400+0+0
> > plane[49]: plane-1
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_1
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[55]: plane-2
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_2
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[61]: plane-3
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_3
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[67]: plane-4
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_8
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[73]: plane-5
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_9
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[79]: plane-6
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_10
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[85]: plane-7
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_11
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[91]: plane-8
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_12
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > plane[97]: plane-9
> >      crtc=(null)
> >      fb=0
> >      crtc-pos=0x0+0+0
> >      src-pos=0.000000x0.000000+0.000000+0.000000
> >      rotation=1
> >      normalized-zpos=0
> >      color-encoding=ITU-R BT.601 YCbCr
> >      color-range=YCbCr limited range
> >      color_mgmt_changed=0
> >      stage=0
> >      sspp[0]=sspp_13
> >      multirect_mode[0]=none
> >      multirect_index[0]=solo
> >      src[0]=0x0+0+0
> >      dst[0]=0x0+0+0
> > crtc[103]: crtc-0
> >      enable=1
> >      active=1
> >      self_refresh_active=0
> >      planes_changed=1
> >      mode_changed=0
> >      active_changed=0
> >      connectors_changed=0
> >      color_mgmt_changed=0
> >      plane_mask=1
> >      connector_mask=1
> >      encoder_mask=1
> >      mode: "1080x2400": 144 394225 1080 1100 1102 1122 2400 2420 2422 2440 0x48 0x0
> >      lm[0]=0
> >      ctl[0]=2
> > crtc[104]: crtc-1
> >      enable=0
> >      active=0
> >      self_refresh_active=0
> >      planes_changed=0
> >      mode_changed=0
> >      active_changed=0
> >      connectors_changed=0
> >      color_mgmt_changed=0
> >      plane_mask=0
> >      connector_mask=0
> >      encoder_mask=0
> >      mode: "": 0 0 0 0 0 0 0 0 0 0 0x0 0x0
> > crtc[105]: crtc-2
> >      enable=0
> >      active=0
> >      self_refresh_active=0
> >      planes_changed=0
> >      mode_changed=0
> >      active_changed=0
> >      connectors_changed=0
> >      color_mgmt_changed=0
> >      plane_mask=0
> >      connector_mask=0
> >      encoder_mask=0
> >      mode: "": 0 0 0 0 0 0 0 0 0 0 0x0 0x0
> > connector[33]: DSI-1
> >      crtc=crtc-0
> >      self_refresh_aware=0
> >      max_requested_bpc=0
> >      colorspace=Default
> > connector[35]: DP-1
> >      crtc=(null)
> >      self_refresh_aware=0
> >      max_requested_bpc=0
> >      colorspace=Default
> > connector[42]: Writeback-1
> >      crtc=(null)
> >      self_refresh_aware=0
> >      max_requested_bpc=0
> >      colorspace=Default
> > resource mapping:
> >      pingpong=103 # # # # # # # # # -
> >      mixer=103 # # # # # -
> >      ctl=# # 103 # # #
> >      dspp=# # # #
> >      dsc=# # # # # #
> >      cdm=-
> >      cwb=# # # #
> > ==================><====================================================
> > 
> > I pasted all the kms_writeback log, I have nothing more.
> > 
> > If I specify `--run-subtest dump-valid-clones` I get:
> > ==================><====================================================
> > IGT_FRAME_DUMP_PATH=$PWD FRAME_PNG_FILE_NAME=out.png /usr/libexec/igt-gpu-tools/kms_writeback -d --run-subtest dump-valid-clones
> > [   33.250236] Console: switching to colour dummy device 80x25
> > IGT-Version: 1.29-1.28 (aarch64) (Linux: 6.12.0-rc1-00022-ge581f752bf79 aarch64)
> > Using IGT_SRANDOM=1709054789 for randomisation[   33.256171] [IGT] kms_writeback: executing
> > 
> > Opened device: /dev/dri/card0
> > [   33.360023] [IGT] kms_writeback: starting subtest dump-valid-clones
> > Starting subtest: dump-valid-clones
> > [   34.063316] [drm:dpu_encoder_virt_atomic_disable:1314] [dpu error]enc32 timeout pending
> > [   34.244272] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
> > [   34.253385] Mem abort info:
> > [   34.256328]   ESR = 0x0000000096000006
> > [   34.260272]   EC = 0x25: DABT (current EL), IL = 32 bits
> > [   34.265816]   SET = 0, FnV = 0
> > [   34.269043]   EA = 0, S1PTW = 0
> > [   34.272332]   FSC = 0x06: level 2 translation fault
> > [   34.277430] Data abort info:
> > [   34.280460]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000
> > [   34.286170]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> > [   34.291438]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> > [   34.296975] user pgtable: 4k pages, 48-bit VAs, pgdp=00000008824fc000
> > [   34.303673] [0000000000000010] pgd=08000008dc4e0003, p4d=08000008dc4e0003, pud=08000008dd4af003, pmd=0000000000000000
> > [   34.314647] Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
> > [   34.321144] Modules linked in: snd_soc_wsa884x q6prm_clocks q6apm_dai
> > q6apm_lpass_dais snd_q6dsp_common q6prm 8021q garp mrp stp llc usb_f_fs
> > libcomposite qrtr_mhi snd_q6apm rpmsg_ctrl fastrpc apr qrtr_smd
> > rpmsg_char snd_soc_hdmi_codec ath12k mac80211 libarc4 mhi
> > panel_visionox_vtdr6130 qcom_pd_mapper goodix_berlin_spi ucsi_glink
> > pmic_glink_altmode pci_pwrctl_pwrseq pci_pwrctl_core typec_ucsi
> > aux_hpd_bridge qcom_battmgr nb7vpq904m wcd939x_usbss goodix_berlin_core
> > crct10dif_ce phy_qcom_eusb2_repeater msm sm3_ce sm3 qcom_q6v5_pas
> > sha3_ce hci_uart sha512_ce sha512_arm64 leds_qcom_lpg ocmem
> > qcom_pil_info qcom_q6v5 qcom_pbs btqca ipa btbcm drm_exec qcom_sysmon
> > pwrseq_qcom_wcn snd_soc_sc8280xp led_class_multicolor snd_soc_qcom_sdw
> > qrtr qcom_common gpu_sched snd_soc_wcd939x drm_dp_aux_bus
> > qcom_spmi_temp_alarm snd_soc_qcom_common qcom_glink_smem
> > snd_soc_wcd939x_sdw rtc_pm8xxx drm_display_helper
> > pinctrl_sm8650_lpass_lpi regmap_sdw cfg80211 bluetooth qcom_pon
> > pmic_glink ecdh_generic pdr_interface phy_qcom_qmp_combo ecc rfkill
> > [   34.321268]  nvmem_qcom_spmi_sdam qcom_stats spi_geni_qcom pwrseq_core i2c_qcom_geni aux_bridge phy_qcom_snps_eusb2 dispcc_sm8550 drm_kms_helper gpi soundwire_qcom snd_soc_lpass_va_macro pinctrl_lpass_lpi snd_soc_wcd_mbhc snd_soc_lpass_tx_macro snd_soc_lpass_rx_macro snd_soc_lpass_wsa_macro llcc_qcom snd_soc_lpass_macro_common slimbus snd_soc_wcd_classh mdt_loader qcom_pdr_msg qcrypto gpucc_sm8650 icc_bwmon qmi_helpers authenc phy_qcom_qmp_ufs libdes soundwire_bus ufs_qcom nvmem_reboot_mode phy_qcom_qmp_pcie typec qcom_rng rmtfs_mem socinfo fuse drm backlight ipv6
> > [   34.464862] CPU: 5 UID: 0 PID: 513 Comm: kms_writeback Tainted: G S                 6.12.0-rc1-00022-ge581f752bf79 #2
> > [   34.475812] Tainted: [S]=CPU_OUT_OF_SPEC
> > [   34.479905] Hardware name: Qualcomm Technologies, Inc. SM8650 QRD (DT)
> > [   34.486667] pstate: 81400005 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
> > [   34.493880] pc : dpu_encoder_helper_phys_setup_cwb+0xb8/0x1ec [msm]
> > [   34.500441] lr : dpu_encoder_helper_phys_setup_cwb+0x88/0x1ec [msm]
> > [   34.506969] sp : ffff800085fc37e0
> > [   34.510437] x29: ffff800085fc3810 x28: ffffb8c93c953068 x27: ffff5af315c90880
> > [   34.517826] x26: ffff5af359c55780 x25: ffff800085fc3878 x24: ffff5af35a956e80
> > [   34.525217] x23: 0000000000000000 x22: ffff5af355dc2080 x21: ffff5af35a956e80
> > [   34.532607] x20: ffff5af315c90880 x19: ffff5af315c90c80 x18: 0000000000000001
> > [   34.539997] x17: 0000000000000018 x16: ffffb8c95c9c8c64 x15: 0000000000000038
> > [   34.547385] x14: 0000001971602a24 x13: 00000000000000e1 x12: 000000000000000b
> > [   34.554774] x11: 0000000000000000 x10: e7125de8a27ae014 x9 : 5aef79bd13b1e2a7
> > [   34.562162] x8 : ffff5af355dc2718 x7 : 0000000000000004 x6 : ffff5af356374d98
> > [   34.569550] x5 : 0000000000000002 x4 : ffff800085fc37f8 x3 : ffff5af315c90950
> > [   34.576938] x2 : 0000000000000002 x1 : 0000000000000000 x0 : 0000000000000001
> > [   34.584328] Call trace:
> > [   34.586905]  dpu_encoder_helper_phys_setup_cwb+0xb8/0x1ec [msm]
> > [   34.593075]  dpu_encoder_helper_phys_cleanup+0x328/0x3c4 [msm]
> > [   34.599165]  dpu_encoder_phys_wb_disable+0x80/0xac [msm]
> > [   34.604713]  dpu_encoder_virt_atomic_disable+0xb4/0x160 [msm]
> > [   34.610711]  disable_outputs+0x108/0x32c [drm_kms_helper]
> > [   34.616351]  drm_atomic_helper_commit_modeset_disables+0x1c/0x4c [drm_kms_helper]
> > [   34.624110]  msm_atomic_commit_tail+0x188/0x514 [msm]
> > [   34.629396]  commit_tail+0xa4/0x18c [drm_kms_helper]
> > [   34.634570]  drm_atomic_helper_commit+0x17c/0x194 [drm_kms_helper]
> > [   34.640990]  drm_atomic_commit+0xb8/0xf4 [drm]
> > [   34.645690]  drm_mode_atomic_ioctl+0xad4/0xd88 [drm]
> > [   34.650889]  drm_ioctl_kernel+0xc0/0x128 [drm]
> > [   34.655564]  drm_ioctl+0x218/0x49c [drm]
> > [   34.659697]  __arm64_sys_ioctl+0xac/0xf0
> > [   34.663804]  invoke_syscall+0x48/0x10c
> > [   34.667755]  el0_svc_common.constprop.0+0xc0/0xe0
> > [   34.672648]  do_el0_svc+0x1c/0x28
> > [   34.676117]  el0_svc+0x34/0xd8
> > [   34.679330]  el0t_64_sync_handler+0x120/0x12c
> > [   34.683864]  el0t_64_sync+0x190/0x194
> > [   34.687699] Code: 910063e1 f8607822 f8607861 b9401042 (b9401021)
> > [   34.694014] ---[ end trace 0000000000000000 ]---
> > ==================><====================================================
> 
> Anything I can try to get past the crash ?

The call to dpu_kms_get_existing_global_state in
dpu_encoder_helper_phys_setup_cwb looks suspicious to me, can you check
whether the returned global state is NULL?

Maxime

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