1 files changed, 673 insertions, 0 deletions
diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_irq.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_irq.c
new file mode 100644
index 00000000000..3d8fc4b4abd
--- /dev/null
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_irq.c
@@ -0,0 +1,673 @@
+/*
+ * 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).
+ */
+
+#include <linux/irq.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/amdgpu_drm.h>
+#include "amdgpu.h"
+#include "amdgpu_ih.h"
+#include "atom.h"
+#include "amdgpu_connectors.h"
+#include "amdgpu_trace.h"
+
+#include <linux/pm_runtime.h>
+
+#ifdef CONFIG_DRM_AMD_DC
+#include "amdgpu_dm_irq.h"
+#endif
+
+#define AMDGPU_WAIT_IDLE_TIMEOUT 200
+
+/**
+ * amdgpu_hotplug_work_func - work handler for display hotplug event
+ *
+ * @work: work struct pointer
+ *
+ * This is the hotplug event work handler (all ASICs).
+ * The work gets scheduled from the IRQ handler if there
+ * was a hotplug interrupt.  It walks through the connector table
+ * and calls hotplug handler for each connector. After this, it sends
+ * a DRM hotplug event to alert userspace.
+ *
+ * This design approach is required in order to defer hotplug event handling
+ * from the IRQ handler to a work handler because hotplug handler has to use
+ * mutexes which cannot be locked in an IRQ handler (since &mutex_lock may
+ * sleep).
+ */
+static void amdgpu_hotplug_work_func(struct work_struct *work)
+{
+	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
+						  hotplug_work);
+	struct drm_device *dev = adev->ddev;
+	struct drm_mode_config *mode_config = &dev->mode_config;
+	struct drm_connector *connector;
+
+	mutex_lock(&mode_config->mutex);
+	list_for_each_entry(connector, &mode_config->connector_list, head)
+		amdgpu_connector_hotplug(connector);
+	mutex_unlock(&mode_config->mutex);
+	/* Just fire off a uevent and let userspace tell us what to do */
+	drm_helper_hpd_irq_event(dev);
+}
+
+/**
+ * amdgpu_irq_reset_work_func - execute GPU reset
+ *
+ * @work: work struct pointer
+ *
+ * Execute scheduled GPU reset (Cayman+).
+ * This function is called when the IRQ handler thinks we need a GPU reset.
+ */
+static void amdgpu_irq_reset_work_func(struct work_struct *work)
+{
+	struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
+						  reset_work);
+
+	if (!amdgpu_sriov_vf(adev))
+		amdgpu_device_gpu_recover(adev, NULL, false);
+}
+
+/**
+ * amdgpu_irq_disable_all - disable *all* interrupts
+ *
+ * @adev: amdgpu device pointer
+ *
+ * Disable all types of interrupts from all sources.
+ */
+void amdgpu_irq_disable_all(struct amdgpu_device *adev)
+{
+	unsigned long irqflags;
+	unsigned i, j, k;
+	int r;
+
+	spin_lock_irqsave(&adev->irq.lock, irqflags);
+	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
+		if (!adev->irq.client[i].sources)
+			continue;
+
+		for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
+			struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
+
+			if (!src || !src->funcs->set || !src->num_types)
+				continue;
+
+			for (k = 0; k < src->num_types; ++k) {
+				atomic_set(&src->enabled_types[k], 0);
+				r = src->funcs->set(adev, src, k,
+						    AMDGPU_IRQ_STATE_DISABLE);
+				if (r)
+					DRM_ERROR("error disabling interrupt (%d)\n",
+						  r);
+			}
+		}
+	}
+	spin_unlock_irqrestore(&adev->irq.lock, irqflags);
+}
+
+/**
+ * amdgpu_irq_handler - IRQ handler
+ *
+ * @irq: IRQ number (unused)
+ * @arg: pointer to DRM device
+ *
+ * IRQ handler for amdgpu driver (all ASICs).
+ *
+ * Returns:
+ * result of handling the IRQ, as defined by &irqreturn_t
+ */
+irqreturn_t amdgpu_irq_handler(void *arg)
+{
+	struct drm_device *dev = (struct drm_device *) arg;
+	struct amdgpu_device *adev = dev->dev_private;
+	irqreturn_t ret;
+
+	if (!adev->irq.installed)
+		return 0;
+
+	ret = amdgpu_ih_process(adev);
+	if (ret == IRQ_HANDLED)
+		pm_runtime_mark_last_busy(dev->dev);
+	return ret;
+}
+
+/**
+ * amdgpu_msi_ok - check whether MSI functionality is enabled
+ *
+ * @adev: amdgpu device pointer (unused)
+ *
+ * Checks whether MSI functionality has been disabled via module parameter
+ * (all ASICs).
+ *
+ * Returns:
+ * *true* if MSIs are allowed to be enabled or *false* otherwise
+ */
+bool amdgpu_msi_ok(struct amdgpu_device *adev)
+{
+	if (amdgpu_msi == 1)
+		return true;
+	else if (amdgpu_msi == 0)
+		return false;
+
+	return true;
+}
+
+/**
+ * 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)
+{
+	int r = 0;
+
+	mtx_init(&adev->irq.lock, IPL_TTY);
+
+#ifdef notyet
+	/* Enable MSI if not disabled by module parameter */
+	adev->irq.msi_enabled = false;
+
+	if (amdgpu_msi_ok(adev)) {
+		int ret = pci_enable_msi(adev->pdev);
+		if (!ret) {
+			adev->irq.msi_enabled = true;
+			dev_dbg(adev->dev, "amdgpu: using MSI.\n");
+		}
+	}
+#endif
+
+	if (!amdgpu_device_has_dc_support(adev)) {
+		if (!adev->enable_virtual_display)
+			/* Disable vblank IRQs aggressively for power-saving */
+			/* XXX: can this be enabled for DC? */
+			adev->ddev->vblank_disable_immediate = true;
+
+		r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
+		if (r)
+			return r;
+
+		/* Pre-DCE11 */
+		INIT_WORK(&adev->hotplug_work,
+				amdgpu_hotplug_work_func);
+	}
+
+	INIT_WORK(&adev->reset_work, amdgpu_irq_reset_work_func);
+
+	adev->irq.installed = true;
+	r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
+	if (r) {
+		adev->irq.installed = false;
+		if (!amdgpu_device_has_dc_support(adev))
+			flush_work(&adev->hotplug_work);
+		cancel_work_sync(&adev->reset_work);
+		return r;
+	}
+	adev->ddev->max_vblank_count = 0x00ffffff;
+
+	DRM_DEBUG("amdgpu: irq initialized.\n");
+	return 0;
+}
+
+/**
+ * amdgpu_irq_fini - 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(struct amdgpu_device *adev)
+{
+	unsigned i, j;
+
+	if (adev->irq.installed) {
+		drm_irq_uninstall(adev->ddev);
+		adev->irq.installed = false;
+		if (adev->irq.msi_enabled)
+			pci_disable_msi(adev->pdev);
+		if (!amdgpu_device_has_dc_support(adev))
+			flush_work(&adev->hotplug_work);
+		cancel_work_sync(&adev->reset_work);
+	}
+
+	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
+		if (!adev->irq.client[i].sources)
+			continue;
+
+		for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
+			struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
+
+			if (!src)
+				continue;
+
+			kfree(src->enabled_types);
+			src->enabled_types = NULL;
+			if (src->data) {
+				kfree(src->data);
+				kfree(src);
+				adev->irq.client[i].sources[j] = NULL;
+			}
+		}
+		kfree(adev->irq.client[i].sources);
+		adev->irq.client[i].sources = NULL;
+	}
+}
+
+/**
+ * amdgpu_irq_add_id - register IRQ source
+ *
+ * @adev: amdgpu device pointer
+ * @client_id: client id
+ * @src_id: source id
+ * @source: IRQ source pointer
+ *
+ * Registers IRQ source on a client.
+ *
+ * Returns:
+ * 0 on success or error code otherwise
+ */
+int amdgpu_irq_add_id(struct amdgpu_device *adev,
+		      unsigned client_id, unsigned src_id,
+		      struct amdgpu_irq_src *source)
+{
+	if (client_id >= AMDGPU_IH_CLIENTID_MAX)
+		return -EINVAL;
+
+	if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
+		return -EINVAL;
+
+	if (!source->funcs)
+		return -EINVAL;
+
+	if (!adev->irq.client[client_id].sources) {
+		adev->irq.client[client_id].sources =
+			kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
+				sizeof(struct amdgpu_irq_src *),
+				GFP_KERNEL);
+		if (!adev->irq.client[client_id].sources)
+			return -ENOMEM;
+	}
+
+	if (adev->irq.client[client_id].sources[src_id] != NULL)
+		return -EINVAL;
+
+	if (source->num_types && !source->enabled_types) {
+		atomic_t *types;
+
+		types = kcalloc(source->num_types, sizeof(atomic_t),
+				GFP_KERNEL);
+		if (!types)
+			return -ENOMEM;
+
+		source->enabled_types = types;
+	}
+
+	adev->irq.client[client_id].sources[src_id] = source;
+	return 0;
+}
+
+/**
+ * amdgpu_irq_dispatch - dispatch IRQ to IP blocks
+ *
+ * @adev: amdgpu device pointer
+ * @entry: interrupt vector pointer
+ *
+ * Dispatches IRQ to IP blocks.
+ */
+void amdgpu_irq_dispatch(struct amdgpu_device *adev,
+			 struct amdgpu_iv_entry *entry)
+{
+	unsigned client_id = entry->client_id;
+	unsigned src_id = entry->src_id;
+	struct amdgpu_irq_src *src;
+	int r;
+
+	trace_amdgpu_iv(entry);
+
+	if (client_id >= AMDGPU_IH_CLIENTID_MAX) {
+		DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
+		return;
+	}
+
+	if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
+		DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
+		return;
+	}
+
+	if (adev->irq.virq[src_id]) {
+		STUB();
+#ifdef notyet
+		generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
+#endif
+	} else {
+		if (!adev->irq.client[client_id].sources) {
+			DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
+				  client_id, src_id);
+			return;
+		}
+
+		src = adev->irq.client[client_id].sources[src_id];
+		if (!src) {
+			DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
+			return;
+		}
+
+		r = src->funcs->process(adev, src, entry);
+		if (r)
+			DRM_ERROR("error processing interrupt (%d)\n", r);
+	}
+}
+
+/**
+ * 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, unsigned type)
+{
+	unsigned long 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;
+
+	r = src->funcs->set(adev, src, type, state);
+	spin_unlock_irqrestore(&adev->irq.lock, irqflags);
+	return r;
+}
+
+/**
+ * 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;
+
+	for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
+		if (!adev->irq.client[i].sources)
+			continue;
+
+		for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
+			struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
+
+			if (!src)
+				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,
+		   unsigned type)
+{
+	if (!adev->ddev->irq_enabled)
+		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,
+		   unsigned type)
+{
+	if (!adev->ddev->irq_enabled)
+		return -ENOENT;
+
+	if (type >= src->num_types)
+		return -EINVAL;
+
+	if (!src->enabled_types || !src->funcs->set)
+		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,
+			unsigned type)
+{
+	if (!adev->ddev->irq_enabled)
+		return false;
+
+	if (type >= src->num_types)
+		return false;
+
+	if (!src->enabled_types || !src->funcs->set)
+		return false;
+
+	return !!atomic_read(&src->enabled_types[type]);
+}
+
+#ifdef __linux__
+/* XXX: Generic IRQ handling */
+static void amdgpu_irq_mask(struct irq_data *irqd)
+{
+	/* XXX */
+}
+
+static void amdgpu_irq_unmask(struct irq_data *irqd)
+{
+	/* XXX */
+}
+
+/* amdgpu hardware interrupt chip descriptor */
+static struct irq_chip amdgpu_irq_chip = {
+	.name = "amdgpu-ih",
+	.irq_mask = amdgpu_irq_mask,
+	.irq_unmask = amdgpu_irq_unmask,
+};
+#endif
+
+#ifdef __linux__
+/**
+ * amdgpu_irqdomain_map - create mapping between virtual and hardware IRQ numbers
+ *
+ * @d: amdgpu IRQ domain pointer (unused)
+ * @irq: virtual IRQ number
+ * @hwirq: hardware irq number
+ *
+ * Current implementation assigns simple interrupt handler to the given virtual
+ * IRQ.
+ *
+ * Returns:
+ * 0 on success or error code otherwise
+ */
+static int amdgpu_irqdomain_map(struct irq_domain *d,
+				unsigned int irq, irq_hw_number_t hwirq)
+{
+	if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
+		return -EPERM;
+
+	irq_set_chip_and_handler(irq,
+				 &amdgpu_irq_chip, handle_simple_irq);
+	return 0;
+}
+
+/* Implementation of methods for amdgpu IRQ domain */
+static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
+	.map = amdgpu_irqdomain_map,
+};
+#endif
+
+/**
+ * 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)
+{
+	STUB();
+	return 0;
+#if 0
+	adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
+						 &amdgpu_hw_irqdomain_ops, adev);
+	if (!adev->irq.domain) {
+		DRM_ERROR("GPU irq add domain failed\n");
+		return -ENODEV;
+	}
+
+	return 0;
+#endif
+}
+
+/**
+ * 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)
+{
+	STUB();
+#if 0
+	if (adev->irq.domain) {
+		irq_domain_remove(adev->irq.domain);
+		adev->irq.domain = NULL;
+	}
+#endif
+}
+
+/**
+ * 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
+ */
+unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
+{
+	STUB();
+	return 0;
+#if 0
+	adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
+
+	return adev->irq.virq[src_id];
+#endif
+}