[Intel-xe] [PATCH 1/2] drm/i915: Initialize dkl_phy spin lock from display code path
Rodrigo Vivi
rodrigo.vivi at intel.com
Tue Apr 11 14:48:26 UTC 2023
On Mon, Apr 10, 2023 at 11:14:37AM -0700, José Roberto de Souza wrote:
> Start to move the initialization of some lock from
> i915_driver_early_probe().
> No dkl function is called prior to intel_setup_outputs(), so this is
> a good place to initialize it.
>
> This will also fix a warning in Xe kmd:
>
> [ 201.894839] xe 0000:00:02.0: [drm] [ENCODER:235:DDI A/PHY A] failed to retrieve link info, disabling eDP
> [ 202.136336] xe 0000:00:02.0: [drm] *ERROR* Failed to write source OUI
> [ 202.175346] INFO: trying to register non-static key.
> [ 202.175347] irq event stamp: 754060
> [ 202.175359] hardirqs last enabled at (754059): [<ffffffff8122cf79>] tick_nohz_idle_enter+0x59/0x80
> [ 202.180294] The code is fine but needs lockdep annotation, or maybe
> [ 202.183774] hardirqs last disabled at (754060): [<ffffffff811a5539>] do_idle+0x99/0x230
> [ 202.192734] you didn't initialize this object before use?
> [ 202.198951] softirqs last enabled at (753948): [<ffffffff8114abae>] irq_exit_rcu+0xbe/0x130
> [ 202.206882] turning off the locking correctness validator.
> [ 202.212236] softirqs last disabled at (753943): [<ffffffff8114abae>] irq_exit_rcu+0xbe/0x130
> [ 202.220592] CPU: 2 PID: 1415 Comm: modprobe Tainted: G W 6.3.0-rc4+zeh-xe+ #909
> [ 202.243002] Hardware name: Intel Corporation Raptor Lake Client Platform/RaptorLake-P LP5 RVP, BIOS RPLPFWI1.R00.3361.A14.2211151548 11/15/2022
> [ 202.255737] Call Trace:
> [ 202.258179] <TASK>
> [ 202.260275] dump_stack_lvl+0x58/0xc0
> [ 202.263922] register_lock_class+0x756/0x7d0
> [ 202.268165] ? find_held_lock+0x2b/0x80
> [ 202.271975] __lock_acquire+0x72/0x28b0
> [ 202.275786] ? debug_object_free+0xb4/0x160
> [ 202.279946] lock_acquire+0xd1/0x2d0
> [ 202.283503] ? intel_dkl_phy_read+0x18/0x60 [xe]
> [ 202.288181] _raw_spin_lock+0x2a/0x40
> [ 202.291825] ? intel_dkl_phy_read+0x18/0x60 [xe]
> [ 202.296475] intel_dkl_phy_read+0x18/0x60 [xe]
> [ 202.300949] icl_aux_power_well_enable+0x2bd/0x400 [xe]
> [ 202.306202] ? intel_display_power_grab_async_put_ref+0x75/0x120 [xe]
> [ 202.312649] intel_power_well_enable+0x1c/0x70 [xe]
> [ 202.317543] __intel_display_power_get_domain.part.0+0x4d/0x70 [xe]
> [ 202.323812] intel_display_power_get+0x43/0x70 [xe]
> [ 202.328708] intel_tc_port_init+0x199/0x2a0 [xe]
> [ 202.333363] intel_ddi_init+0x6ad/0xb00 [xe]
> [ 202.337678] intel_modeset_init_nogem+0x536/0x6d0 [xe]
> [ 202.342838] xe_display_init_noaccel+0x19/0x40 [xe]
> [ 202.347743] xe_device_probe+0x1f5/0x2a0 [xe]
> [ 202.352127] xe_pci_probe+0x28c/0x480 [xe]
> [ 202.356260] pci_device_probe+0x9d/0x150
> [ 202.360164] really_probe+0x19a/0x400
> [ 202.363809] ? __pfx___driver_attach+0x10/0x10
> [ 202.368226] __driver_probe_device+0x73/0x170
> [ 202.372558] driver_probe_device+0x1a/0x90
> [ 202.376632] __driver_attach+0xcd/0x1c0
> [ 202.380442] bus_for_each_dev+0x72/0xc0
> [ 202.384253] bus_add_driver+0x110/0x210
> [ 202.388063] driver_register+0x50/0x100
> [ 202.391873] ? __pfx_init_module+0x10/0x10 [xe]
> [ 202.396431] do_one_initcall+0x55/0x260
> [ 202.400245] ? rcu_is_watching+0xd/0x40
> [ 202.404058] ? kmalloc_trace+0xa0/0xb0
> [ 202.407786] do_init_module+0x45/0x1e0
> [ 202.411512] __do_sys_finit_module+0xac/0x120
> [ 202.415838] do_syscall_64+0x37/0x90
> [ 202.419397] entry_SYSCALL_64_after_hwframe+0x72/0xdc
> [ 202.424409] RIP: 0033:0x7fd11291ea3d
> [ 202.427967] Code: 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c3 a3 0f 00 f7 d8 64 89 01 48
> [ 202.446530] RSP: 002b:00007ffffde11368 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [ 202.454031] RAX: ffffffffffffffda RBX: 00005616a617f210 RCX: 00007fd11291ea3d
> [ 202.461106] RDX: 0000000000000000 RSI: 00005616a617fe60 RDI: 000000000000000e
> [ 202.468182] RBP: 0000000000040000 R08: 0000000000000000 R09: 0000000000000002
> [ 202.475250] R10: 000000000000000e R11: 0000000000000246 R12: 00005616a617fe60
> [ 202.482319] R13: 00005616a617f340 R14: 0000000000000000 R15: 00005616a6180650
> [ 202.489396] </TASK>
>
> Cc: intel-gfx at lists.freedesktop.org
> Cc: intel-xe at lists.freedesktop.org
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
folks, any thoughts on this being initialized on intel_setup_outputs
rather than earlier during early probe?
It looks safe for now based on Jose's analyses and tests and we
can always move that earlier if needed...
So, I'm adding my rv-b here already, but will give a time to get
a second thought on this before we merge:
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 3 +++
> drivers/gpu/drm/i915/display/intel_dkl_phy.c | 6 ++++++
> drivers/gpu/drm/i915/display/intel_dkl_phy.h | 2 ++
> drivers/gpu/drm/i915/i915_driver.c | 1 -
> 4 files changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 010ee793e1ffd..d384b9bbc28b0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -73,6 +73,7 @@
> #include "intel_display_debugfs.h"
> #include "intel_display_power.h"
> #include "intel_display_types.h"
> +#include "intel_dkl_phy.h"
> #include "intel_dmc.h"
> #include "intel_dp.h"
> #include "intel_dp_link_training.h"
> @@ -7729,6 +7730,8 @@ static void intel_setup_outputs(struct drm_i915_private *dev_priv)
> if (!HAS_DISPLAY(dev_priv))
> return;
>
> + intel_dkl_phy_init(dev_priv);
> +
> if (IS_DG2(dev_priv)) {
> intel_ddi_init(dev_priv, PORT_A);
> intel_ddi_init(dev_priv, PORT_B);
> diff --git a/drivers/gpu/drm/i915/display/intel_dkl_phy.c b/drivers/gpu/drm/i915/display/intel_dkl_phy.c
> index 57cc3edba0163..5bce7b5b27bc7 100644
> --- a/drivers/gpu/drm/i915/display/intel_dkl_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_dkl_phy.c
> @@ -104,3 +104,9 @@ intel_dkl_phy_posting_read(struct drm_i915_private *i915, struct intel_dkl_phy_r
>
> spin_unlock(&i915->display.dkl.phy_lock);
> }
> +
> +void
> +intel_dkl_phy_init(struct drm_i915_private *i915)
> +{
> + spin_lock_init(&i915->display.dkl.phy_lock);
> +}
> diff --git a/drivers/gpu/drm/i915/display/intel_dkl_phy.h b/drivers/gpu/drm/i915/display/intel_dkl_phy.h
> index 570ee36f9386f..615429b6392c5 100644
> --- a/drivers/gpu/drm/i915/display/intel_dkl_phy.h
> +++ b/drivers/gpu/drm/i915/display/intel_dkl_phy.h
> @@ -20,5 +20,7 @@ void
> intel_dkl_phy_rmw(struct drm_i915_private *i915, struct intel_dkl_phy_reg reg, u32 clear, u32 set);
> void
> intel_dkl_phy_posting_read(struct drm_i915_private *i915, struct intel_dkl_phy_reg reg);
> +void
> +intel_dkl_phy_init(struct drm_i915_private *i915);
>
> #endif /* __INTEL_DKL_PHY_H__ */
> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
> index 93fdc40d724fa..cc31ad1bfa93a 100644
> --- a/drivers/gpu/drm/i915/i915_driver.c
> +++ b/drivers/gpu/drm/i915/i915_driver.c
> @@ -222,7 +222,6 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
> mutex_init(&dev_priv->display.wm.wm_mutex);
> mutex_init(&dev_priv->display.pps.mutex);
> mutex_init(&dev_priv->display.hdcp.comp_mutex);
> - spin_lock_init(&dev_priv->display.dkl.phy_lock);
>
> i915_memcpy_init_early(dev_priv);
> intel_runtime_pm_init_early(&dev_priv->runtime_pm);
> --
> 2.40.0
>
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