[Intel-xe] [Intel-gfx] [PATCH v3 1/6] drm/i915: Initialize dkl_phy spin lock from display code path
Jani Nikula
jani.nikula at linux.intel.com
Tue Apr 11 08:51:33 UTC 2023
On Tue, 11 Apr 2023, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> On Mon, Apr 10, 2023 at 11:32:14AM -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.
>
> I disagree. We don't want to sprinke these all over the place.
I'm thinking if only foo.c uses a lock, foo.c should initialize it, not
someone else.
BR,
Jani.
>
>> 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>
>> 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 24c96f388d521..cf3a3b3afdd13 100644
>> --- a/drivers/gpu/drm/i915/display/intel_display.c
>> +++ b/drivers/gpu/drm/i915/display/intel_display.c
>> @@ -83,6 +83,7 @@
>> #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"
>> @@ -7883,6 +7884,8 @@ 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 066d79c2069c4..6fe1a97cc246d 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -224,7 +224,6 @@ 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
--
Jani Nikula, Intel Open Source Graphics Center
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