static int intel_runtime_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct drm_device *dev = pci_get_drvdata(pdev);
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
WARN_ON(!HAS_RUNTIME_PM(dev));
DRM_DEBUG_KMS("Resuming device\n");
intel_opregion_notify_adapter(dev, PCI_D0);
dev_priv->pm.suspended = false;
if (IS_GEN6(dev)) {
ret = snb_runtime_resume(dev_priv);
} else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
ret = hsw_runtime_resume(dev_priv);
} else if (IS_VALLEYVIEW(dev)) {
ret = vlv_runtime_resume(dev_priv);
} else {
WARN_ON(1);
ret = -ENODEV;
}
/*
* No point of rolling back things in case of an error, as the best
* we can do is to hope that things will still work (and disable RPM).
*/
i915_gem_init_swizzling(dev);
gen6_update_ring_freq(dev);
intel_runtime_pm_restore_interrupts(dev);
intel_reset_gt_powersave(dev);
if (ret)
DRM_ERROR("Runtime resume failed, disabling it (%d)\n", ret);
else
DRM_DEBUG_KMS("Device resumed\n");
return ret;
}
/**
* i915_reset - reset chip after a hang
* @dev: drm device to reset
*
* Reset the chip. Useful if a hang is detected. Returns zero on successful
* reset or otherwise an error code.
*
* Procedure is fairly simple:
* - reset the chip using the reset reg
* - re-init context state
* - re-init hardware status page
* - re-init ring buffer
* - re-init interrupt state
* - re-init display
*/
int i915_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
bool simulated;
int ret;
intel_reset_gt_powersave(dev);
mutex_lock(&dev->struct_mutex);
i915_gem_reset(dev);
simulated = dev_priv->gpu_error.stop_rings != 0;
ret = intel_gpu_reset(dev, ALL_ENGINES);
/* Also reset the gpu hangman. */
if (simulated) {
DRM_INFO("Simulated gpu hang, resetting stop_rings\n");
dev_priv->gpu_error.stop_rings = 0;
if (ret == -ENODEV) {
DRM_INFO("Reset not implemented, but ignoring "
"error for simulated gpu hangs\n");
ret = 0;
}
}
if (i915_stop_ring_allow_warn(dev_priv))
pr_notice("drm/i915: Resetting chip after gpu hang\n");
if (ret) {
DRM_ERROR("Failed to reset chip: %i\n", ret);
mutex_unlock(&dev->struct_mutex);
return ret;
}
intel_overlay_reset(dev_priv);
/* Ok, now get things going again... */
/*
* Everything depends on having the GTT running, so we need to start
* there. Fortunately we don't need to do this unless we reset the
* chip at a PCI level.
*
* Next we need to restore the context, but we don't use those
* yet either...
*
* Ring buffer needs to be re-initialized in the KMS case, or if X
* was running at the time of the reset (i.e. we weren't VT
* switched away).
*/
/* Used to prevent gem_check_wedged returning -EAGAIN during gpu reset */
dev_priv->gpu_error.reload_in_reset = true;
ret = i915_gem_init_hw(dev);
dev_priv->gpu_error.reload_in_reset = false;
mutex_unlock(&dev->struct_mutex);
if (ret) {
DRM_ERROR("Failed hw init on reset %d\n", ret);
return ret;
}
/*
* rps/rc6 re-init is necessary to restore state lost after the
* reset and the re-install of gt irqs. Skip for ironlake per
* previous concerns that it doesn't respond well to some forms
* of re-init after reset.
*/
if (INTEL_INFO(dev)->gen > 5)
intel_enable_gt_powersave(dev);
return 0;
}
/**
* i915_reset - reset chip after a hang
* @dev: drm device to reset
*
* Reset the chip. Useful if a hang is detected. Returns zero on successful
* reset or otherwise an error code.
*
* Procedure is fairly simple:
* - reset the chip using the reset reg
* - re-init context state
* - re-init hardware status page
* - re-init ring buffer
* - re-init interrupt state
* - re-init display
*/
int i915_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
bool simulated;
int ret;
if (!i915.reset)
return 0;
mutex_lock(&dev->struct_mutex);
i915_gem_reset(dev);
simulated = dev_priv->gpu_error.stop_rings != 0;
ret = intel_gpu_reset(dev);
/* Also reset the gpu hangman. */
if (simulated) {
DRM_INFO("Simulated gpu hang, resetting stop_rings\n");
dev_priv->gpu_error.stop_rings = 0;
if (ret == -ENODEV) {
DRM_INFO("Reset not implemented, but ignoring "
"error for simulated gpu hangs\n");
ret = 0;
}
}
if (ret) {
DRM_ERROR("Failed to reset chip: %i\n", ret);
mutex_unlock(&dev->struct_mutex);
return ret;
}
/* Ok, now get things going again... */
/*
* Everything depends on having the GTT running, so we need to start
* there. Fortunately we don't need to do this unless we reset the
* chip at a PCI level.
*
* Next we need to restore the context, but we don't use those
* yet either...
*
* Ring buffer needs to be re-initialized in the KMS case, or if X
* was running at the time of the reset (i.e. we weren't VT
* switched away).
*/
if (drm_core_check_feature(dev, DRIVER_MODESET) ||
!dev_priv->ums.mm_suspended) {
dev_priv->ums.mm_suspended = 0;
ret = i915_gem_init_hw(dev);
mutex_unlock(&dev->struct_mutex);
if (ret) {
DRM_ERROR("Failed hw init on reset %d\n", ret);
return ret;
}
/*
* FIXME: This races pretty badly against concurrent holders of
* ring interrupts. This is possible since we've started to drop
* dev->struct_mutex in select places when waiting for the gpu.
*/
/*
* rps/rc6 re-init is necessary to restore state lost after the
* reset and the re-install of gt irqs. Skip for ironlake per
* previous concerns that it doesn't respond well to some forms
* of re-init after reset.
*/
if (INTEL_INFO(dev)->gen > 5)
intel_reset_gt_powersave(dev);
intel_hpd_init(dev);
} else {
mutex_unlock(&dev->struct_mutex);
}
return 0;
}
