/* * Copyright 2008 Advanced Micro Devices, Inc. * Copyright 2008 Red Hat Inc. * Copyright 2009 Jerome Glisse. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Dave Airlie * Alex Deucher * Jerome Glisse
*/
/** * DOC: Interrupt Handling * * Interrupts generated within GPU hardware raise interrupt requests that are * passed to amdgpu IRQ handler which is responsible for detecting source and * type of the interrupt and dispatching matching handlers. If handling an * interrupt requires calling kernel functions that may sleep processing is * dispatched to work handlers. * * If MSI functionality is not disabled by module parameter then MSI * support will be enabled. * * For GPU interrupt sources that may be driven by another driver, IRQ domain * support is used (with mapping between virtual and hardware IRQs).
*/
/** * amdgpu_irq_init - initialize interrupt handling * * @adev: amdgpu device pointer * * Sets up work functions for hotplug and reset interrupts, enables MSI * functionality, initializes vblank, hotplug and reset interrupt handling. * * Returns: * 0 on success or error code on failure
*/ int amdgpu_irq_init(struct amdgpu_device *adev)
{ unsignedint irq, flags; int r;
spin_lock_init(&adev->irq.lock);
/* Enable MSI if not disabled by module parameter */
adev->irq.msi_enabled = false;
if (!amdgpu_msi_ok(adev))
flags = PCI_IRQ_INTX; else
flags = PCI_IRQ_ALL_TYPES;
/* we only need one vector */
r = pci_alloc_irq_vectors(adev->pdev, 1, 1, flags); if (r < 0) {
dev_err(adev->dev, "Failed to alloc msi vectors\n"); return r;
}
if (amdgpu_msi_ok(adev)) {
adev->irq.msi_enabled = true;
dev_dbg(adev->dev, "using MSI/MSI-X.\n");
}
/** * amdgpu_irq_fini_sw - shut down interrupt handling * * @adev: amdgpu device pointer * * Tears down work functions for hotplug and reset interrupts, disables MSI * functionality, shuts down vblank, hotplug and reset interrupt handling, * turns off interrupts from all sources (all ASICs).
*/ void amdgpu_irq_fini_sw(struct amdgpu_device *adev)
{ unsignedint i, j;
for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) { if (!adev->irq.client[i].sources) continue;
/* * timestamp is not supported on some legacy SOCs (cik, cz, iceland, * si and tonga), so initialize timestamp and timestamp_src to 0
*/
entry.timestamp = 0;
entry.timestamp_src = 0;
/* Send it to amdkfd as well if it isn't already handled */ if (!handled)
amdgpu_amdkfd_interrupt(adev, entry.iv_entry);
if (amdgpu_ih_ts_after(ih->processed_timestamp, entry.timestamp))
ih->processed_timestamp = entry.timestamp;
}
/** * amdgpu_irq_delegate - delegate IV to soft IH ring * * @adev: amdgpu device pointer * @entry: IV entry * @num_dw: size of IV * * Delegate the IV to the soft IH ring and schedule processing of it. Used * if the hardware delegation to IH1 or IH2 doesn't work for some reason.
*/ void amdgpu_irq_delegate(struct amdgpu_device *adev, struct amdgpu_iv_entry *entry, unsignedint num_dw)
{
amdgpu_ih_ring_write(adev, &adev->irq.ih_soft, entry->iv_entry, num_dw);
schedule_work(&adev->irq.ih_soft_work);
}
/** * amdgpu_irq_update - update hardware interrupt state * * @adev: amdgpu device pointer * @src: interrupt source pointer * @type: type of interrupt * * Updates interrupt state for the specific source (all ASICs).
*/ int amdgpu_irq_update(struct amdgpu_device *adev, struct amdgpu_irq_src *src, unsignedint type)
{ unsignedlong irqflags; enum amdgpu_interrupt_state state; int r;
spin_lock_irqsave(&adev->irq.lock, irqflags);
/* We need to determine after taking the lock, otherwise * we might disable just enabled interrupts again
*/ if (amdgpu_irq_enabled(adev, src, type))
state = AMDGPU_IRQ_STATE_ENABLE; else
state = AMDGPU_IRQ_STATE_DISABLE;
/** * amdgpu_irq_gpu_reset_resume_helper - update interrupt states on all sources * * @adev: amdgpu device pointer * * Updates state of all types of interrupts on all sources on resume after * reset.
*/ void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
{ int i, j, k;
if (amdgpu_sriov_vf(adev) || amdgpu_passthrough(adev))
amdgpu_restore_msix(adev);
for (i = 0; i < AMDGPU_IRQ_CLIENTID_MAX; ++i) { if (!adev->irq.client[i].sources) continue;
if (!src || !src->funcs || !src->funcs->set) continue; for (k = 0; k < src->num_types; k++)
amdgpu_irq_update(adev, src, k);
}
}
}
/** * amdgpu_irq_get - enable interrupt * * @adev: amdgpu device pointer * @src: interrupt source pointer * @type: type of interrupt * * Enables specified type of interrupt on the specified source (all ASICs). * * Returns: * 0 on success or error code otherwise
*/ int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src, unsignedint type)
{ if (!adev->irq.installed) return -ENOENT;
if (type >= src->num_types) return -EINVAL;
if (!src->enabled_types || !src->funcs->set) return -EINVAL;
if (atomic_inc_return(&src->enabled_types[type]) == 1) return amdgpu_irq_update(adev, src, type);
return 0;
}
/** * amdgpu_irq_put - disable interrupt * * @adev: amdgpu device pointer * @src: interrupt source pointer * @type: type of interrupt * * Enables specified type of interrupt on the specified source (all ASICs). * * Returns: * 0 on success or error code otherwise
*/ int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src, unsignedint type)
{ /* When the threshold is reached,the interrupt source may not be enabled.return -EINVAL */ if (amdgpu_ras_is_rma(adev) && !amdgpu_irq_enabled(adev, src, type)) return -EINVAL;
if (!adev->irq.installed) return -ENOENT;
if (type >= src->num_types) return -EINVAL;
if (!src->enabled_types || !src->funcs->set) return -EINVAL;
if (WARN_ON(!amdgpu_irq_enabled(adev, src, type))) return -EINVAL;
if (atomic_dec_and_test(&src->enabled_types[type])) return amdgpu_irq_update(adev, src, type);
return 0;
}
/** * amdgpu_irq_enabled - check whether interrupt is enabled or not * * @adev: amdgpu device pointer * @src: interrupt source pointer * @type: type of interrupt * * Checks whether the given type of interrupt is enabled on the given source. * * Returns: * *true* if interrupt is enabled, *false* if interrupt is disabled or on * invalid parameters
*/ bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src, unsignedint type)
{ if (!adev->irq.installed) returnfalse;
if (type >= src->num_types) returnfalse;
if (!src->enabled_types || !src->funcs->set) returnfalse;
/* Implementation of methods for amdgpu IRQ domain */ staticconststruct irq_domain_ops amdgpu_hw_irqdomain_ops = {
.map = amdgpu_irqdomain_map,
};
/** * amdgpu_irq_add_domain - create a linear IRQ domain * * @adev: amdgpu device pointer * * Creates an IRQ domain for GPU interrupt sources * that may be driven by another driver (e.g., ACP). * * Returns: * 0 on success or error code otherwise
*/ int amdgpu_irq_add_domain(struct amdgpu_device *adev)
{
adev->irq.domain = irq_domain_create_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
&amdgpu_hw_irqdomain_ops, adev); if (!adev->irq.domain) {
dev_err(adev->dev, "GPU irq add domain failed\n"); return -ENODEV;
}
return 0;
}
/** * amdgpu_irq_remove_domain - remove the IRQ domain * * @adev: amdgpu device pointer * * Removes the IRQ domain for GPU interrupt sources * that may be driven by another driver (e.g., ACP).
*/ void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
{ if (adev->irq.domain) {
irq_domain_remove(adev->irq.domain);
adev->irq.domain = NULL;
}
}
/** * amdgpu_irq_create_mapping - create mapping between domain Linux IRQs * * @adev: amdgpu device pointer * @src_id: IH source id * * Creates mapping between a domain IRQ (GPU IH src id) and a Linux IRQ * Use this for components that generate a GPU interrupt, but are driven * by a different driver (e.g., ACP). * * Returns: * Linux IRQ
*/ unsignedint amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsignedint src_id)
{
adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
return adev->irq.virq[src_id];
}
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