mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 18:56:41 +07:00
24808e9679
Local function with forgotten static declaration.
Fixes: 19625e85c6
("drm/i915: Enable polling when we don't have hpd")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Lyude <cpaul@redhat.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1471432146-5196-2-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
606 lines
19 KiB
C
606 lines
19 KiB
C
/*
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* Copyright © 2015 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include <drm/drmP.h>
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#include <drm/i915_drm.h>
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#include "i915_drv.h"
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#include "intel_drv.h"
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/**
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* DOC: Hotplug
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*
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* Simply put, hotplug occurs when a display is connected to or disconnected
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* from the system. However, there may be adapters and docking stations and
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* Display Port short pulses and MST devices involved, complicating matters.
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*
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* Hotplug in i915 is handled in many different levels of abstraction.
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*
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* The platform dependent interrupt handling code in i915_irq.c enables,
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* disables, and does preliminary handling of the interrupts. The interrupt
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* handlers gather the hotplug detect (HPD) information from relevant registers
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* into a platform independent mask of hotplug pins that have fired.
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*
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* The platform independent interrupt handler intel_hpd_irq_handler() in
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* intel_hotplug.c does hotplug irq storm detection and mitigation, and passes
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* further processing to appropriate bottom halves (Display Port specific and
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* regular hotplug).
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*
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* The Display Port work function i915_digport_work_func() calls into
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* intel_dp_hpd_pulse() via hooks, which handles DP short pulses and DP MST long
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* pulses, with failures and non-MST long pulses triggering regular hotplug
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* processing on the connector.
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*
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* The regular hotplug work function i915_hotplug_work_func() calls connector
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* detect hooks, and, if connector status changes, triggers sending of hotplug
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* uevent to userspace via drm_kms_helper_hotplug_event().
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*
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* Finally, the userspace is responsible for triggering a modeset upon receiving
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* the hotplug uevent, disabling or enabling the crtc as needed.
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*
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* The hotplug interrupt storm detection and mitigation code keeps track of the
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* number of interrupts per hotplug pin per a period of time, and if the number
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* of interrupts exceeds a certain threshold, the interrupt is disabled for a
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* while before being re-enabled. The intention is to mitigate issues raising
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* from broken hardware triggering massive amounts of interrupts and grinding
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* the system to a halt.
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*
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* Current implementation expects that hotplug interrupt storm will not be
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* seen when display port sink is connected, hence on platforms whose DP
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* callback is handled by i915_digport_work_func reenabling of hpd is not
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* performed (it was never expected to be disabled in the first place ;) )
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* this is specific to DP sinks handled by this routine and any other display
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* such as HDMI or DVI enabled on the same port will have proper logic since
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* it will use i915_hotplug_work_func where this logic is handled.
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*/
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bool intel_hpd_pin_to_port(enum hpd_pin pin, enum port *port)
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{
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switch (pin) {
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case HPD_PORT_A:
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*port = PORT_A;
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return true;
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case HPD_PORT_B:
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*port = PORT_B;
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return true;
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case HPD_PORT_C:
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*port = PORT_C;
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return true;
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case HPD_PORT_D:
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*port = PORT_D;
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return true;
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case HPD_PORT_E:
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*port = PORT_E;
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return true;
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default:
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return false; /* no hpd */
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}
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}
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#define HPD_STORM_DETECT_PERIOD 1000
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#define HPD_STORM_THRESHOLD 5
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#define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000)
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/**
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* intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin
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* @dev_priv: private driver data pointer
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* @pin: the pin to gather stats on
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*
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* Gather stats about HPD irqs from the specified @pin, and detect irq
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* storms. Only the pin specific stats and state are changed, the caller is
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* responsible for further action.
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*
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* @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms,
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* otherwise it's considered an irq storm, and the irq state is set to
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* @HPD_MARK_DISABLED.
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*
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* Return true if an irq storm was detected on @pin.
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*/
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static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
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enum hpd_pin pin)
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{
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unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
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unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
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bool storm = false;
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if (!time_in_range(jiffies, start, end)) {
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dev_priv->hotplug.stats[pin].last_jiffies = jiffies;
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dev_priv->hotplug.stats[pin].count = 0;
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DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin);
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} else if (dev_priv->hotplug.stats[pin].count > HPD_STORM_THRESHOLD) {
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dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED;
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DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin);
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storm = true;
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} else {
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dev_priv->hotplug.stats[pin].count++;
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DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin,
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dev_priv->hotplug.stats[pin].count);
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}
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return storm;
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}
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static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
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{
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struct drm_device *dev = &dev_priv->drm;
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struct drm_mode_config *mode_config = &dev->mode_config;
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struct intel_connector *intel_connector;
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struct intel_encoder *intel_encoder;
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struct drm_connector *connector;
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enum hpd_pin pin;
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bool hpd_disabled = false;
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assert_spin_locked(&dev_priv->irq_lock);
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list_for_each_entry(connector, &mode_config->connector_list, head) {
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if (connector->polled != DRM_CONNECTOR_POLL_HPD)
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continue;
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intel_connector = to_intel_connector(connector);
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intel_encoder = intel_connector->encoder;
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if (!intel_encoder)
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continue;
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pin = intel_encoder->hpd_pin;
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if (pin == HPD_NONE ||
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dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
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continue;
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DRM_INFO("HPD interrupt storm detected on connector %s: "
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"switching from hotplug detection to polling\n",
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connector->name);
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dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
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connector->polled = DRM_CONNECTOR_POLL_CONNECT
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| DRM_CONNECTOR_POLL_DISCONNECT;
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hpd_disabled = true;
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}
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/* Enable polling and queue hotplug re-enabling. */
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if (hpd_disabled) {
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drm_kms_helper_poll_enable_locked(dev);
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mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
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msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
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}
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}
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static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
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{
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struct drm_i915_private *dev_priv =
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container_of(work, typeof(*dev_priv),
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hotplug.reenable_work.work);
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struct drm_device *dev = &dev_priv->drm;
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struct drm_mode_config *mode_config = &dev->mode_config;
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int i;
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intel_runtime_pm_get(dev_priv);
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spin_lock_irq(&dev_priv->irq_lock);
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for_each_hpd_pin(i) {
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struct drm_connector *connector;
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if (dev_priv->hotplug.stats[i].state != HPD_DISABLED)
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continue;
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dev_priv->hotplug.stats[i].state = HPD_ENABLED;
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list_for_each_entry(connector, &mode_config->connector_list, head) {
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struct intel_connector *intel_connector = to_intel_connector(connector);
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if (intel_connector->encoder->hpd_pin == i) {
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if (connector->polled != intel_connector->polled)
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DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
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connector->name);
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connector->polled = intel_connector->polled;
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if (!connector->polled)
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connector->polled = DRM_CONNECTOR_POLL_HPD;
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}
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}
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}
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if (dev_priv->display.hpd_irq_setup)
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dev_priv->display.hpd_irq_setup(dev_priv);
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spin_unlock_irq(&dev_priv->irq_lock);
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intel_runtime_pm_put(dev_priv);
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}
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static bool intel_hpd_irq_event(struct drm_device *dev,
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struct drm_connector *connector)
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{
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enum drm_connector_status old_status;
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WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
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old_status = connector->status;
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connector->status = connector->funcs->detect(connector, false);
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if (old_status == connector->status)
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return false;
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
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connector->base.id,
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connector->name,
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drm_get_connector_status_name(old_status),
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drm_get_connector_status_name(connector->status));
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return true;
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}
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static void i915_digport_work_func(struct work_struct *work)
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{
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struct drm_i915_private *dev_priv =
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container_of(work, struct drm_i915_private, hotplug.dig_port_work);
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u32 long_port_mask, short_port_mask;
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struct intel_digital_port *intel_dig_port;
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int i;
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u32 old_bits = 0;
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spin_lock_irq(&dev_priv->irq_lock);
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long_port_mask = dev_priv->hotplug.long_port_mask;
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dev_priv->hotplug.long_port_mask = 0;
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short_port_mask = dev_priv->hotplug.short_port_mask;
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dev_priv->hotplug.short_port_mask = 0;
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spin_unlock_irq(&dev_priv->irq_lock);
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for (i = 0; i < I915_MAX_PORTS; i++) {
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bool valid = false;
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bool long_hpd = false;
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intel_dig_port = dev_priv->hotplug.irq_port[i];
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if (!intel_dig_port || !intel_dig_port->hpd_pulse)
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continue;
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if (long_port_mask & (1 << i)) {
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valid = true;
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long_hpd = true;
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} else if (short_port_mask & (1 << i))
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valid = true;
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if (valid) {
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enum irqreturn ret;
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ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd);
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if (ret == IRQ_NONE) {
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/* fall back to old school hpd */
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old_bits |= (1 << intel_dig_port->base.hpd_pin);
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}
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}
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}
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if (old_bits) {
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spin_lock_irq(&dev_priv->irq_lock);
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dev_priv->hotplug.event_bits |= old_bits;
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spin_unlock_irq(&dev_priv->irq_lock);
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schedule_work(&dev_priv->hotplug.hotplug_work);
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}
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}
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/*
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* Handle hotplug events outside the interrupt handler proper.
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*/
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static void i915_hotplug_work_func(struct work_struct *work)
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{
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struct drm_i915_private *dev_priv =
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container_of(work, struct drm_i915_private, hotplug.hotplug_work);
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struct drm_device *dev = &dev_priv->drm;
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struct drm_mode_config *mode_config = &dev->mode_config;
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struct intel_connector *intel_connector;
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struct intel_encoder *intel_encoder;
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struct drm_connector *connector;
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bool changed = false;
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u32 hpd_event_bits;
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mutex_lock(&mode_config->mutex);
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DRM_DEBUG_KMS("running encoder hotplug functions\n");
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spin_lock_irq(&dev_priv->irq_lock);
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hpd_event_bits = dev_priv->hotplug.event_bits;
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dev_priv->hotplug.event_bits = 0;
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/* Disable hotplug on connectors that hit an irq storm. */
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intel_hpd_irq_storm_disable(dev_priv);
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spin_unlock_irq(&dev_priv->irq_lock);
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list_for_each_entry(connector, &mode_config->connector_list, head) {
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intel_connector = to_intel_connector(connector);
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if (!intel_connector->encoder)
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continue;
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intel_encoder = intel_connector->encoder;
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if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
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DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
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connector->name, intel_encoder->hpd_pin);
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if (intel_encoder->hot_plug)
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intel_encoder->hot_plug(intel_encoder);
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if (intel_hpd_irq_event(dev, connector))
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changed = true;
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}
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}
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mutex_unlock(&mode_config->mutex);
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if (changed)
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drm_kms_helper_hotplug_event(dev);
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}
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/**
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* intel_hpd_irq_handler - main hotplug irq handler
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* @dev_priv: drm_i915_private
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* @pin_mask: a mask of hpd pins that have triggered the irq
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* @long_mask: a mask of hpd pins that may be long hpd pulses
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*
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* This is the main hotplug irq handler for all platforms. The platform specific
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* irq handlers call the platform specific hotplug irq handlers, which read and
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* decode the appropriate registers into bitmasks about hpd pins that have
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* triggered (@pin_mask), and which of those pins may be long pulses
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* (@long_mask). The @long_mask is ignored if the port corresponding to the pin
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* is not a digital port.
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*
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* Here, we do hotplug irq storm detection and mitigation, and pass further
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* processing to appropriate bottom halves.
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*/
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void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
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u32 pin_mask, u32 long_mask)
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{
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int i;
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enum port port;
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bool storm_detected = false;
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bool queue_dig = false, queue_hp = false;
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bool is_dig_port;
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if (!pin_mask)
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return;
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spin_lock(&dev_priv->irq_lock);
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for_each_hpd_pin(i) {
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if (!(BIT(i) & pin_mask))
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continue;
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is_dig_port = intel_hpd_pin_to_port(i, &port) &&
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dev_priv->hotplug.irq_port[port];
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if (is_dig_port) {
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bool long_hpd = long_mask & BIT(i);
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DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port),
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long_hpd ? "long" : "short");
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/*
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* For long HPD pulses we want to have the digital queue happen,
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* but we still want HPD storm detection to function.
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*/
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queue_dig = true;
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if (long_hpd) {
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dev_priv->hotplug.long_port_mask |= (1 << port);
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} else {
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/* for short HPD just trigger the digital queue */
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dev_priv->hotplug.short_port_mask |= (1 << port);
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continue;
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}
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}
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if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) {
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/*
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* On GMCH platforms the interrupt mask bits only
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* prevent irq generation, not the setting of the
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* hotplug bits itself. So only WARN about unexpected
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* interrupts on saner platforms.
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*/
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WARN_ONCE(!HAS_GMCH_DISPLAY(dev_priv),
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"Received HPD interrupt on pin %d although disabled\n", i);
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continue;
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}
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if (dev_priv->hotplug.stats[i].state != HPD_ENABLED)
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continue;
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if (!is_dig_port) {
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dev_priv->hotplug.event_bits |= BIT(i);
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queue_hp = true;
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}
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if (intel_hpd_irq_storm_detect(dev_priv, i)) {
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dev_priv->hotplug.event_bits &= ~BIT(i);
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storm_detected = true;
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}
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}
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if (storm_detected)
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dev_priv->display.hpd_irq_setup(dev_priv);
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spin_unlock(&dev_priv->irq_lock);
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/*
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* Our hotplug handler can grab modeset locks (by calling down into the
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* fb helpers). Hence it must not be run on our own dev-priv->wq work
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* queue for otherwise the flush_work in the pageflip code will
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* deadlock.
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*/
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if (queue_dig)
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queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
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if (queue_hp)
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schedule_work(&dev_priv->hotplug.hotplug_work);
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}
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/**
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* intel_hpd_init - initializes and enables hpd support
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* @dev_priv: i915 device instance
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*
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* This function enables the hotplug support. It requires that interrupts have
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* already been enabled with intel_irq_init_hw(). From this point on hotplug and
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* poll request can run concurrently to other code, so locking rules must be
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* obeyed.
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*
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* This is a separate step from interrupt enabling to simplify the locking rules
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* in the driver load and resume code.
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*
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* Also see: intel_hpd_poll_init(), which enables connector polling
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*/
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void intel_hpd_init(struct drm_i915_private *dev_priv)
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{
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int i;
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for_each_hpd_pin(i) {
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dev_priv->hotplug.stats[i].count = 0;
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dev_priv->hotplug.stats[i].state = HPD_ENABLED;
|
|
}
|
|
|
|
WRITE_ONCE(dev_priv->hotplug.poll_enabled, false);
|
|
schedule_work(&dev_priv->hotplug.poll_init_work);
|
|
|
|
/*
|
|
* Interrupt setup is already guaranteed to be single-threaded, this is
|
|
* just to make the assert_spin_locked checks happy.
|
|
*/
|
|
spin_lock_irq(&dev_priv->irq_lock);
|
|
if (dev_priv->display.hpd_irq_setup)
|
|
dev_priv->display.hpd_irq_setup(dev_priv);
|
|
spin_unlock_irq(&dev_priv->irq_lock);
|
|
}
|
|
|
|
static void i915_hpd_poll_init_work(struct work_struct *work)
|
|
{
|
|
struct drm_i915_private *dev_priv =
|
|
container_of(work, struct drm_i915_private,
|
|
hotplug.poll_init_work);
|
|
struct drm_device *dev = &dev_priv->drm;
|
|
struct drm_mode_config *mode_config = &dev->mode_config;
|
|
struct drm_connector *connector;
|
|
bool enabled;
|
|
|
|
mutex_lock(&dev->mode_config.mutex);
|
|
|
|
enabled = READ_ONCE(dev_priv->hotplug.poll_enabled);
|
|
|
|
list_for_each_entry(connector, &mode_config->connector_list, head) {
|
|
struct intel_connector *intel_connector =
|
|
to_intel_connector(connector);
|
|
connector->polled = intel_connector->polled;
|
|
|
|
/* MST has a dynamic intel_connector->encoder and it's reprobing
|
|
* is all handled by the MST helpers. */
|
|
if (intel_connector->mst_port)
|
|
continue;
|
|
|
|
if (!connector->polled && I915_HAS_HOTPLUG(dev) &&
|
|
intel_connector->encoder->hpd_pin > HPD_NONE) {
|
|
connector->polled = enabled ?
|
|
DRM_CONNECTOR_POLL_CONNECT |
|
|
DRM_CONNECTOR_POLL_DISCONNECT :
|
|
DRM_CONNECTOR_POLL_HPD;
|
|
}
|
|
}
|
|
|
|
if (enabled)
|
|
drm_kms_helper_poll_enable_locked(dev);
|
|
|
|
mutex_unlock(&dev->mode_config.mutex);
|
|
|
|
/*
|
|
* We might have missed any hotplugs that happened while we were
|
|
* in the middle of disabling polling
|
|
*/
|
|
if (!enabled)
|
|
drm_helper_hpd_irq_event(dev);
|
|
}
|
|
|
|
/**
|
|
* intel_hpd_poll_init - enables/disables polling for connectors with hpd
|
|
* @dev_priv: i915 device instance
|
|
*
|
|
* This function enables polling for all connectors, regardless of whether or
|
|
* not they support hotplug detection. Under certain conditions HPD may not be
|
|
* functional. On most Intel GPUs, this happens when we enter runtime suspend.
|
|
* On Valleyview and Cherryview systems, this also happens when we shut off all
|
|
* of the powerwells.
|
|
*
|
|
* Since this function can get called in contexts where we're already holding
|
|
* dev->mode_config.mutex, we do the actual hotplug enabling in a seperate
|
|
* worker.
|
|
*
|
|
* Also see: intel_hpd_init(), which restores hpd handling.
|
|
*/
|
|
void intel_hpd_poll_init(struct drm_i915_private *dev_priv)
|
|
{
|
|
WRITE_ONCE(dev_priv->hotplug.poll_enabled, true);
|
|
|
|
/*
|
|
* We might already be holding dev->mode_config.mutex, so do this in a
|
|
* seperate worker
|
|
* As well, there's no issue if we race here since we always reschedule
|
|
* this worker anyway
|
|
*/
|
|
schedule_work(&dev_priv->hotplug.poll_init_work);
|
|
}
|
|
|
|
void intel_hpd_init_work(struct drm_i915_private *dev_priv)
|
|
{
|
|
INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
|
|
INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
|
|
INIT_WORK(&dev_priv->hotplug.poll_init_work, i915_hpd_poll_init_work);
|
|
INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
|
|
intel_hpd_irq_storm_reenable_work);
|
|
}
|
|
|
|
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
|
|
{
|
|
spin_lock_irq(&dev_priv->irq_lock);
|
|
|
|
dev_priv->hotplug.long_port_mask = 0;
|
|
dev_priv->hotplug.short_port_mask = 0;
|
|
dev_priv->hotplug.event_bits = 0;
|
|
|
|
spin_unlock_irq(&dev_priv->irq_lock);
|
|
|
|
cancel_work_sync(&dev_priv->hotplug.dig_port_work);
|
|
cancel_work_sync(&dev_priv->hotplug.hotplug_work);
|
|
cancel_work_sync(&dev_priv->hotplug.poll_init_work);
|
|
cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
|
|
}
|
|
|
|
bool intel_hpd_disable(struct drm_i915_private *dev_priv, enum hpd_pin pin)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (pin == HPD_NONE)
|
|
return false;
|
|
|
|
spin_lock_irq(&dev_priv->irq_lock);
|
|
if (dev_priv->hotplug.stats[pin].state == HPD_ENABLED) {
|
|
dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
|
|
ret = true;
|
|
}
|
|
spin_unlock_irq(&dev_priv->irq_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void intel_hpd_enable(struct drm_i915_private *dev_priv, enum hpd_pin pin)
|
|
{
|
|
if (pin == HPD_NONE)
|
|
return;
|
|
|
|
spin_lock_irq(&dev_priv->irq_lock);
|
|
dev_priv->hotplug.stats[pin].state = HPD_ENABLED;
|
|
spin_unlock_irq(&dev_priv->irq_lock);
|
|
}
|