1. 27 Apr, 2022 1 commit
    • Kuogee Hsieh's avatar
      drm/msm/dp: remove fail safe mode related code · 3f65b1e2
      Kuogee Hsieh authored
      Current DP driver implementation has adding safe mode done at
      dp_hpd_plug_handle() which is expected to be executed under event
      thread context.
      
      However there is possible circular locking happen (see blow stack trace)
      after edp driver call dp_hpd_plug_handle() from dp_bridge_enable() which
      is executed under drm_thread context.
      
      After review all possibilities methods and as discussed on
      https://patchwork.freedesktop.org/patch/483155/, supporting EDID
      compliance tests in the driver is quite hacky. As seen with other
      vendor drivers, supporting these will be much easier with IGT. Hence
      removing all the related fail safe code for it so that no possibility
      of circular lock will happen.
      Reviewed-by: default avatarStephen Boyd <swboyd@chromium.org>
      Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
      Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      
      ======================================================
       WARNING: possible circular locking dependency detected
       5.15.35-lockdep #6 Tainted: G        W
       ------------------------------------------------------
       frecon/429 is trying to acquire lock:
       ffffff808dc3c4e8 (&dev->mode_config.mutex){+.+.}-{3:3}, at:
      dp_panel_add_fail_safe_mode+0x4c/0xa0
      
       but task is already holding lock:
       ffffff808dc441e0 (&kms->commit_lock[i]){+.+.}-{3:3}, at: lock_crtcs+0xb4/0x124
      
       which lock already depends on the new lock.
      
       the existing dependency chain (in reverse order) is:
      
       -> #3 (&kms->commit_lock[i]){+.+.}-{3:3}:
              __mutex_lock_common+0x174/0x1a64
              mutex_lock_nested+0x98/0xac
              lock_crtcs+0xb4/0x124
              msm_atomic_commit_tail+0x330/0x748
              commit_tail+0x19c/0x278
              drm_atomic_helper_commit+0x1dc/0x1f0
              drm_atomic_commit+0xc0/0xd8
              drm_atomic_helper_set_config+0xb4/0x134
              drm_mode_setcrtc+0x688/0x1248
              drm_ioctl_kernel+0x1e4/0x338
              drm_ioctl+0x3a4/0x684
              __arm64_sys_ioctl+0x118/0x154
              invoke_syscall+0x78/0x224
              el0_svc_common+0x178/0x200
              do_el0_svc+0x94/0x13c
              el0_svc+0x5c/0xec
              el0t_64_sync_handler+0x78/0x108
              el0t_64_sync+0x1a4/0x1a8
      
       -> #2 (crtc_ww_class_mutex){+.+.}-{3:3}:
              __mutex_lock_common+0x174/0x1a64
              ww_mutex_lock+0xb8/0x278
              modeset_lock+0x304/0x4ac
              drm_modeset_lock+0x4c/0x7c
              drmm_mode_config_init+0x4a8/0xc50
              msm_drm_init+0x274/0xac0
              msm_drm_bind+0x20/0x2c
              try_to_bring_up_master+0x3dc/0x470
              __component_add+0x18c/0x3c0
              component_add+0x1c/0x28
              dp_display_probe+0x954/0xa98
              platform_probe+0x124/0x15c
              really_probe+0x1b0/0x5f8
              __driver_probe_device+0x174/0x20c
              driver_probe_device+0x70/0x134
              __device_attach_driver+0x130/0x1d0
              bus_for_each_drv+0xfc/0x14c
              __device_attach+0x1bc/0x2bc
              device_initial_probe+0x1c/0x28
              bus_probe_device+0x94/0x178
              deferred_probe_work_func+0x1a4/0x1f0
              process_one_work+0x5d4/0x9dc
              worker_thread+0x898/0xccc
              kthread+0x2d4/0x3d4
              ret_from_fork+0x10/0x20
      
       -> #1 (crtc_ww_class_acquire){+.+.}-{0:0}:
              ww_acquire_init+0x1c4/0x2c8
              drm_modeset_acquire_init+0x44/0xc8
              drm_helper_probe_single_connector_modes+0xb0/0x12dc
              drm_mode_getconnector+0x5dc/0xfe8
              drm_ioctl_kernel+0x1e4/0x338
              drm_ioctl+0x3a4/0x684
              __arm64_sys_ioctl+0x118/0x154
              invoke_syscall+0x78/0x224
              el0_svc_common+0x178/0x200
              do_el0_svc+0x94/0x13c
              el0_svc+0x5c/0xec
              el0t_64_sync_handler+0x78/0x108
              el0t_64_sync+0x1a4/0x1a8
      
       -> #0 (&dev->mode_config.mutex){+.+.}-{3:3}:
              __lock_acquire+0x2650/0x672c
              lock_acquire+0x1b4/0x4ac
              __mutex_lock_common+0x174/0x1a64
              mutex_lock_nested+0x98/0xac
              dp_panel_add_fail_safe_mode+0x4c/0xa0
              dp_hpd_plug_handle+0x1f0/0x280
              dp_bridge_enable+0x94/0x2b8
              drm_atomic_bridge_chain_enable+0x11c/0x168
              drm_atomic_helper_commit_modeset_enables+0x500/0x740
              msm_atomic_commit_tail+0x3e4/0x748
              commit_tail+0x19c/0x278
              drm_atomic_helper_commit+0x1dc/0x1f0
              drm_atomic_commit+0xc0/0xd8
              drm_atomic_helper_set_config+0xb4/0x134
              drm_mode_setcrtc+0x688/0x1248
              drm_ioctl_kernel+0x1e4/0x338
              drm_ioctl+0x3a4/0x684
              __arm64_sys_ioctl+0x118/0x154
              invoke_syscall+0x78/0x224
              el0_svc_common+0x178/0x200
              do_el0_svc+0x94/0x13c
              el0_svc+0x5c/0xec
              el0t_64_sync_handler+0x78/0x108
              el0t_64_sync+0x1a4/0x1a8
      
      Changes in v2:
      -- re text commit title
      -- remove all fail safe mode
      
      Changes in v3:
      -- remove dp_panel_add_fail_safe_mode() from dp_panel.h
      -- add Fixes
      
      Changes in v5:
      --  to=dianders@chromium.org
      
      Changes in v6:
      --  fix Fixes commit ID
      
      Fixes: 8b2c181e ("drm/msm/dp: add fail safe mode outside of event_mutex context")
      Reported-by: default avatarDouglas Anderson <dianders@chromium.org>
      Signed-off-by: default avatarKuogee Hsieh <quic_khsieh@quicinc.com>
      Link: https://lore.kernel.org/r/1651007534-31842-1-git-send-email-quic_khsieh@quicinc.comSigned-off-by: default avatarRob Clark <robdclark@chromium.org>
      3f65b1e2
  2. 19 Apr, 2022 1 commit
    • Dmitry Baryshkov's avatar
      drm/msm: Revert "drm/msm: Stop using iommu_present()" · 0371870b
      Dmitry Baryshkov authored
      This reverts commit e2a88eab. The commit
      in question makes msm_use_mmu() check whether the DRM 'component master'
      device is translated by the IOMMU. At this moment it is the 'mdss'
      device.
      However on platforms using the MDP5 driver (e.g. MSM8916/APQ8016,
      MSM8996/APQ8096) it's the mdp5 device, which has the iommus property
      (and thus is "translated by the IOMMU"). This results in these devices
      being broken with the following lines in the dmesg.
      
      [drm] Initialized msm 1.9.0 20130625 for 1a00000.mdss on minor 0
      msm 1a00000.mdss: [drm:adreno_request_fw] loaded qcom/a300_pm4.fw from new location
      msm 1a00000.mdss: [drm:adreno_request_fw] loaded qcom/a300_pfp.fw from new location
      msm 1a00000.mdss: [drm:get_pages] *ERROR* could not get pages: -28
      msm 1a00000.mdss: could not allocate stolen bo
      msm 1a00000.mdss: [drm:get_pages] *ERROR* could not get pages: -28
      msm 1a00000.mdss: [drm:msm_alloc_stolen_fb] *ERROR* failed to allocate buffer object
      msm 1a00000.mdss: [drm:msm_fbdev_create] *ERROR* failed to allocate fb
      
      Getting the mdp5 device pointer from this function is not that easy at
      this moment. Thus this patch is reverted till the MDSS rework [1] lands.
      It will make the mdp5/dpu1 device component master and the check will be
      legit.
      
      [1] https://patchwork.freedesktop.org/series/98525/
      
      Fixes: e2a88eab ("drm/msm: Stop using iommu_present()")
      Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Link: https://lore.kernel.org/r/20220419130422.1033699-1-dmitry.baryshkov@linaro.orgSigned-off-by: default avatarRob Clark <robdclark@chromium.org>
      0371870b
  3. 12 Apr, 2022 1 commit
    • Nathan Chancellor's avatar
      drm/msm/gpu: Avoid -Wunused-function with !CONFIG_PM_SLEEP · 390d6458
      Nathan Chancellor authored
      When building with CONFIG_PM=y and CONFIG_PM_SLEEP=n (such as ARCH=riscv
      allmodconfig), the following warnings/errors occur:
      
        drivers/gpu/drm/msm/adreno/adreno_device.c:679:12: error: 'adreno_system_resume' defined but not used [-Werror=unused-function]
          679 | static int adreno_system_resume(struct device *dev)
              |            ^~~~~~~~~~~~~~~~~~~~
        drivers/gpu/drm/msm/adreno/adreno_device.c:655:12: error: 'adreno_system_suspend' defined but not used [-Werror=unused-function]
          655 | static int adreno_system_suspend(struct device *dev)
              |            ^~~~~~~~~~~~~~~~~~~~~
        cc1: all warnings being treated as errors
      
      These functions are only used in SET_SYSTEM_SLEEP_PM_OPS(), which
      evaluates to empty when CONFIG_PM_SLEEP is not set, making these
      functions unused.
      
      To resolve this, use the SYSTEM_SLEEP_PM_OPS() and RUNTIME_PM_OPS()
      macros, which were introduced in commit 1a3c7bb0 ("PM: core: Add new
      *_PM_OPS macros, deprecate old ones"). They are designed to avoid these
      compiler warnings while still guarding their use on
      CONFIG_PM{,_SLEEP}=y.
      
      Fixes: 7e4167c9 ("drm/msm/gpu: Park scheduler threads for system suspend")
      Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
      Link: https://lore.kernel.org/r/20220411181249.2758344-1-nathan@kernel.orgSigned-off-by: default avatarRob Clark <robdclark@chromium.org>
      390d6458
  4. 11 Apr, 2022 5 commits
    • Kuogee Hsieh's avatar
      drm/msm/dp: add fail safe mode outside of event_mutex context · 8b2c181e
      Kuogee Hsieh authored
      There is possible circular locking dependency detected on event_mutex
      (see below logs). This is due to set fail safe mode is done at
      dp_panel_read_sink_caps() within event_mutex scope. To break this
      possible circular locking, this patch move setting fail safe mode
      out of event_mutex scope.
      
      [   23.958078] ======================================================
      [   23.964430] WARNING: possible circular locking dependency detected
      [   23.970777] 5.17.0-rc2-lockdep-00088-g05241de1 #148 Not tainted
      [   23.977219] ------------------------------------------------------
      [   23.983570] DrmThread/1574 is trying to acquire lock:
      [   23.988763] ffffff808423aab0 (&dp->event_mutex){+.+.}-{3:3}, at: msm_dp_displ                                                                             ay_enable+0x58/0x164
      [   23.997895]
      [   23.997895] but task is already holding lock:
      [   24.003895] ffffff808420b280 (&kms->commit_lock[i]/1){+.+.}-{3:3}, at: lock_c                                                                             rtcs+0x80/0x8c
      [   24.012495]
      [   24.012495] which lock already depends on the new lock.
      [   24.012495]
      [   24.020886]
      [   24.020886] the existing dependency chain (in reverse order) is:
      [   24.028570]
      [   24.028570] -> #5 (&kms->commit_lock[i]/1){+.+.}-{3:3}:
      [   24.035472]        __mutex_lock+0xc8/0x384
      [   24.039695]        mutex_lock_nested+0x54/0x74
      [   24.044272]        lock_crtcs+0x80/0x8c
      [   24.048222]        msm_atomic_commit_tail+0x1e8/0x3d0
      [   24.053413]        commit_tail+0x7c/0xfc
      [   24.057452]        drm_atomic_helper_commit+0x158/0x15c
      [   24.062826]        drm_atomic_commit+0x60/0x74
      [   24.067403]        drm_mode_atomic_ioctl+0x6b0/0x908
      [   24.072508]        drm_ioctl_kernel+0xe8/0x168
      [   24.077086]        drm_ioctl+0x320/0x370
      [   24.081123]        drm_compat_ioctl+0x40/0xdc
      [   24.085602]        __arm64_compat_sys_ioctl+0xe0/0x150
      [   24.090895]        invoke_syscall+0x80/0x114
      [   24.095294]        el0_svc_common.constprop.3+0xc4/0xf8
      [   24.100668]        do_el0_svc_compat+0x2c/0x54
      [   24.105242]        el0_svc_compat+0x4c/0xe4
      [   24.109548]        el0t_32_sync_handler+0xc4/0xf4
      [   24.114381]        el0t_32_sync+0x178
      [   24.118688]
      [   24.118688] -> #4 (&kms->commit_lock[i]){+.+.}-{3:3}:
      [   24.125408]        __mutex_lock+0xc8/0x384
      [   24.129628]        mutex_lock_nested+0x54/0x74
      [   24.134204]        lock_crtcs+0x80/0x8c
      [   24.138155]        msm_atomic_commit_tail+0x1e8/0x3d0
      [   24.143345]        commit_tail+0x7c/0xfc
      [   24.147382]        drm_atomic_helper_commit+0x158/0x15c
      [   24.152755]        drm_atomic_commit+0x60/0x74
      [   24.157323]        drm_atomic_helper_set_config+0x68/0x90
      [   24.162869]        drm_mode_setcrtc+0x394/0x648
      [   24.167535]        drm_ioctl_kernel+0xe8/0x168
      [   24.172102]        drm_ioctl+0x320/0x370
      [   24.176135]        drm_compat_ioctl+0x40/0xdc
      [   24.180621]        __arm64_compat_sys_ioctl+0xe0/0x150
      [   24.185904]        invoke_syscall+0x80/0x114
      [   24.190302]        el0_svc_common.constprop.3+0xc4/0xf8
      [   24.195673]        do_el0_svc_compat+0x2c/0x54
      [   24.200241]        el0_svc_compat+0x4c/0xe4
      [   24.204544]        el0t_32_sync_handler+0xc4/0xf4
      [   24.209378]        el0t_32_sync+0x174/0x178
      [   24.213680] -> #3 (crtc_ww_class_mutex){+.+.}-{3:3}:
      [   24.220308]        __ww_mutex_lock.constprop.20+0xe8/0x878
      [   24.225951]        ww_mutex_lock+0x60/0xd0
      [   24.230166]        modeset_lock+0x190/0x19c
      [   24.234467]        drm_modeset_lock+0x34/0x54
      [   24.238953]        drmm_mode_config_init+0x550/0x764
      [   24.244065]        msm_drm_bind+0x170/0x59c
      [   24.248374]        try_to_bring_up_master+0x244/0x294
      [   24.253572]        __component_add+0xf4/0x14c
      [   24.258057]        component_add+0x2c/0x38
      [   24.262273]        dsi_dev_attach+0x2c/0x38
      [   24.266575]        dsi_host_attach+0xc4/0x120
      [   24.271060]        mipi_dsi_attach+0x34/0x48
      [   24.275456]        devm_mipi_dsi_attach+0x28/0x68
      [   24.280298]        ti_sn_bridge_probe+0x2b4/0x2dc
      [   24.285137]        auxiliary_bus_probe+0x78/0x90
      [   24.289893]        really_probe+0x1e4/0x3d8
      [   24.294194]        __driver_probe_device+0x14c/0x164
      [   24.299298]        driver_probe_device+0x54/0xf8
      [   24.304043]        __device_attach_driver+0xb4/0x118
      [   24.309145]        bus_for_each_drv+0xb0/0xd4
      [   24.313628]        __device_attach+0xcc/0x158
      [   24.318112]        device_initial_probe+0x24/0x30
      [   24.322954]        bus_probe_device+0x38/0x9c
      [   24.327439]        deferred_probe_work_func+0xd4/0xf0
      [   24.332628]        process_one_work+0x2f0/0x498
      [   24.337289]        process_scheduled_works+0x44/0x48
      [   24.342391]        worker_thread+0x1e4/0x26c
      [   24.346788]        kthread+0xe4/0xf4
      [   24.350470]        ret_from_fork+0x10/0x20
      [   24.354683]
      [   24.354683]
      [   24.354683] -> #2 (crtc_ww_class_acquire){+.+.}-{0:0}:
      [   24.361489]        drm_modeset_acquire_init+0xe4/0x138
      [   24.366777]        drm_helper_probe_detect_ctx+0x44/0x114
      [   24.372327]        check_connector_changed+0xbc/0x198
      [   24.377517]        drm_helper_hpd_irq_event+0xcc/0x11c
      [   24.382804]        dsi_hpd_worker+0x24/0x30
      [   24.387104]        process_one_work+0x2f0/0x498
      [   24.391762]        worker_thread+0x1d0/0x26c
      [   24.396158]        kthread+0xe4/0xf4
      [   24.399840]        ret_from_fork+0x10/0x20
      [   24.404053]
      [   24.404053] -> #1 (&dev->mode_config.mutex){+.+.}-{3:3}:
      [   24.411032]        __mutex_lock+0xc8/0x384
      [   24.415247]        mutex_lock_nested+0x54/0x74
      [   24.419819]        dp_panel_read_sink_caps+0x23c/0x26c
      [   24.425108]        dp_display_process_hpd_high+0x34/0xd4
      [   24.430570]        dp_display_usbpd_configure_cb+0x30/0x3c
      [   24.436205]        hpd_event_thread+0x2ac/0x550
      [   24.440864]        kthread+0xe4/0xf4
      [   24.444544]        ret_from_fork+0x10/0x20
      [   24.448757]
      [   24.448757] -> #0 (&dp->event_mutex){+.+.}-{3:3}:
      [   24.455116]        __lock_acquire+0xe2c/0x10d8
      [   24.459690]        lock_acquire+0x1ac/0x2d0
      [   24.463988]        __mutex_lock+0xc8/0x384
      [   24.468201]        mutex_lock_nested+0x54/0x74
      [   24.472773]        msm_dp_display_enable+0x58/0x164
      [   24.477789]        dp_bridge_enable+0x24/0x30
      [   24.482273]        drm_atomic_bridge_chain_enable+0x78/0x9c
      [   24.488006]        drm_atomic_helper_commit_modeset_enables+0x1bc/0x244
      [   24.494801]        msm_atomic_commit_tail+0x248/0x3d0
      [   24.499992]        commit_tail+0x7c/0xfc
      [   24.504031]        drm_atomic_helper_commit+0x158/0x15c
      [   24.509404]        drm_atomic_commit+0x60/0x74
      [   24.513976]        drm_mode_atomic_ioctl+0x6b0/0x908
      [   24.519079]        drm_ioctl_kernel+0xe8/0x168
      [   24.523650]        drm_ioctl+0x320/0x370
      [   24.527689]        drm_compat_ioctl+0x40/0xdc
      [   24.532175]        __arm64_compat_sys_ioctl+0xe0/0x150
      [   24.537463]        invoke_syscall+0x80/0x114
      [   24.541861]        el0_svc_common.constprop.3+0xc4/0xf8
      [   24.547235]        do_el0_svc_compat+0x2c/0x54
      [   24.551806]        el0_svc_compat+0x4c/0xe4
      [   24.556106]        el0t_32_sync_handler+0xc4/0xf4
      [   24.560948]        el0t_32_sync+0x174/0x178
      
      Changes in v2:
      -- add circular lockiing trace
      
      Fixes: d4aca422 ("drm/msm/dp:  always add fail-safe mode into connector mode list")
      Signed-off-by: default avatarKuogee Hsieh <quic_khsieh@quicinc.com>
      Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Patchwork: https://patchwork.freedesktop.org/patch/481396/
      Link: https://lore.kernel.org/r/1649451894-554-1-git-send-email-quic_khsieh@quicinc.comSigned-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
      8b2c181e
    • Stephen Boyd's avatar
      drm/msm/dsi: Use connector directly in msm_dsi_manager_connector_init() · 47b7de6b
      Stephen Boyd authored
      The member 'msm_dsi->connector' isn't assigned until
      msm_dsi_manager_connector_init() returns (see msm_dsi_modeset_init() and
      how it assigns the return value). Therefore this pointer is going to be
      NULL here. Let's use 'connector' which is what was intended.
      
      Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Cc: Sean Paul <seanpaul@chromium.org>
      Fixes: 6d5e7840 ("drm/msm/dsi: Move dsi panel init into modeset init path")
      Signed-off-by: default avatarStephen Boyd <swboyd@chromium.org>
      Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Patchwork: https://patchwork.freedesktop.org/patch/478693/
      Link: https://lore.kernel.org/r/20220318000731.2823718-1-swboyd@chromium.orgSigned-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
      47b7de6b
    • Robin Murphy's avatar
      drm/msm: Stop using iommu_present() · e2a88eab
      Robin Murphy authored
      Even if some IOMMU has registered itself on the platform "bus", that
      doesn't necessarily mean it provides translation for the device we
      care about. Replace iommu_present() with a more appropriate check.
      Signed-off-by: default avatarRobin Murphy <robin.murphy@arm.com>
      Reviewed-by: default avatarRob Clark <robdclark@gmail.com>
      Patchwork: https://patchwork.freedesktop.org/patch/480707/
      Link: https://lore.kernel.org/r/5ab4f4574d7f3e042261da702d493ee40d003356.1649168268.git.robin.murphy@arm.comSigned-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
      e2a88eab
    • Xiaoke Wang's avatar
      drm/msm/mdp5: check the return of kzalloc() · 047ae665
      Xiaoke Wang authored
      kzalloc() is a memory allocation function which can return NULL when
      some internal memory errors happen. So it is better to check it to
      prevent potential wrong memory access.
      
      Besides, since mdp5_plane_reset() is void type, so we should better
      set `plane-state` to NULL after releasing it.
      Signed-off-by: default avatarXiaoke Wang <xkernel.wang@foxmail.com>
      Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Patchwork: https://patchwork.freedesktop.org/patch/481055/
      Link: https://lore.kernel.org/r/tencent_8E2A1C78140EE1784AB2FF4B2088CC0AB908@qq.comSigned-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
      Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
      047ae665
    • Rob Clark's avatar
      drm/msm: Fix range size vs end confusion · 537fef80
      Rob Clark authored
      The fourth param is size, rather than range_end.
      
      Note that we could increase the address space size if we had a way to
      prevent buffers from spanning a 4G split, mostly just to avoid fw bugs
      with 64b math.
      
      Fixes: 84c31ee1 ("drm/msm/a6xx: Add support for per-instance pagetables")
      Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
      Link: https://lore.kernel.org/r/20220407202836.1211268-1-robdclark@gmail.comSigned-off-by: default avatarRob Clark <robdclark@chromium.org>
      537fef80
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