--- /dev/null
+/*
+ * 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
+ */
+#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 <linux/pm_runtime.h>
+
+#define AMDGPU_WAIT_IDLE_TIMEOUT 200
+
+/*
+ * Handle hotplug events outside the interrupt handler proper.
+ */
+/**
+ * amdgpu_hotplug_work_func - display hotplug work handler
+ *
+ * @work: work struct
+ *
+ * This is the hot plug event work handler (all asics).
+ * The work gets scheduled from the irq handler if there
+ * was a hot plug interrupt. It walks the connector table
+ * and calls the hotplug handler for each one, then sends
+ * a drm hotplug event to alert userspace.
+ */
+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);
+ if (mode_config->num_connector) {
+ 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
+ *
+ * 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);
+
+ amdgpu_gpu_reset(adev);
+}
+
+/* Disable *all* interrupts */
+static void amdgpu_irq_disable_all(struct amdgpu_device *adev)
+{
+ unsigned long irqflags;
+ unsigned i, j;
+ int r;
+
+ spin_lock_irqsave(&adev->irq.lock, irqflags);
+ for (i = 0; i < AMDGPU_MAX_IRQ_SRC_ID; ++i) {
+ struct amdgpu_irq_src *src = adev->irq.sources[i];
+
+ if (!src || !src->funcs->set || !src->num_types)
+ continue;
+
+ for (j = 0; j < src->num_types; ++j) {
+ atomic_set(&src->enabled_types[j], 0);
+ r = src->funcs->set(adev, src, j,
+ AMDGPU_IRQ_STATE_DISABLE);
+ if (r)
+ DRM_ERROR("error disabling interrupt (%d)\n",
+ r);
+ }
+ }
+ spin_unlock_irqrestore(&adev->irq.lock, irqflags);
+}
+
+/**
+ * amdgpu_irq_preinstall - drm irq preinstall callback
+ *
+ * @dev: drm dev pointer
+ *
+ * Gets the hw ready to enable irqs (all asics).
+ * This function disables all interrupt sources on the GPU.
+ */
+void amdgpu_irq_preinstall(struct drm_device *dev)
+{
+ struct amdgpu_device *adev = dev->dev_private;
+
+ /* Disable *all* interrupts */
+ amdgpu_irq_disable_all(adev);
+ /* Clear bits */
+ amdgpu_ih_process(adev);
+}
+
+/**
+ * amdgpu_irq_postinstall - drm irq preinstall callback
+ *
+ * @dev: drm dev pointer
+ *
+ * Handles stuff to be done after enabling irqs (all asics).
+ * Returns 0 on success.
+ */
+int amdgpu_irq_postinstall(struct drm_device *dev)
+{
+ dev->max_vblank_count = 0x00ffffff;
+ return 0;
+}
+
+/**
+ * amdgpu_irq_uninstall - drm irq uninstall callback
+ *
+ * @dev: drm dev pointer
+ *
+ * This function disables all interrupt sources on the GPU (all asics).
+ */
+void amdgpu_irq_uninstall(struct drm_device *dev)
+{
+ struct amdgpu_device *adev = dev->dev_private;
+
+ if (adev == NULL) {
+ return;
+ }
+ amdgpu_irq_disable_all(adev);
+}
+
+/**
+ * amdgpu_irq_handler - irq handler
+ *
+ * @int irq, void *arg: args
+ *
+ * This is the irq handler for the amdgpu driver (all asics).
+ */
+irqreturn_t amdgpu_irq_handler(int irq, void *arg)
+{
+ struct drm_device *dev = (struct drm_device *) arg;
+ struct amdgpu_device *adev = dev->dev_private;
+ irqreturn_t ret;
+
+ ret = amdgpu_ih_process(adev);
+ if (ret == IRQ_HANDLED)
+ pm_runtime_mark_last_busy(dev->dev);
+ return ret;
+}
+
+/**
+ * amdgpu_msi_ok - asic specific msi checks
+ *
+ * @adev: amdgpu device pointer
+ *
+ * Handles asic specific MSI checks to determine if
+ * MSIs should be enabled on a particular chip (all asics).
+ * Returns true if MSIs should be enabled, false if MSIs
+ * should not be enabled.
+ */
+static bool amdgpu_msi_ok(struct amdgpu_device *adev)
+{
+ /* force MSI on */
+ if (amdgpu_msi == 1)
+ return true;
+ else if (amdgpu_msi == 0)
+ return false;
+
+ return true;
+}
+
+/**
+ * amdgpu_irq_init - init driver interrupt info
+ *
+ * @adev: amdgpu device pointer
+ *
+ * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
+ * Returns 0 for success, error for failure.
+ */
+int amdgpu_irq_init(struct amdgpu_device *adev)
+{
+ int r = 0;
+
+ spin_lock_init(&adev->irq.lock);
+ r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
+ if (r) {
+ return r;
+ }
+ /* enable msi */
+ 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_info(adev->dev, "amdgpu: using MSI.\n");
+ }
+ }
+
+ 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;
+ flush_work(&adev->hotplug_work);
+ return r;
+ }
+
+ DRM_INFO("amdgpu: irq initialized.\n");
+ return 0;
+}
+
+/**
+ * amdgpu_irq_fini - tear down driver interrupt info
+ *
+ * @adev: amdgpu device pointer
+ *
+ * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
+ */
+void amdgpu_irq_fini(struct amdgpu_device *adev)
+{
+ unsigned i;
+
+ drm_vblank_cleanup(adev->ddev);
+ if (adev->irq.installed) {
+ drm_irq_uninstall(adev->ddev);
+ adev->irq.installed = false;
+ if (adev->irq.msi_enabled)
+ pci_disable_msi(adev->pdev);
+ flush_work(&adev->hotplug_work);
+ }
+
+ for (i = 0; i < AMDGPU_MAX_IRQ_SRC_ID; ++i) {
+ struct amdgpu_irq_src *src = adev->irq.sources[i];
+
+ if (!src)
+ continue;
+
+ kfree(src->enabled_types);
+ src->enabled_types = NULL;
+ if (src->data) {
+ kfree(src->data);
+ kfree(src);
+ adev->irq.sources[i] = NULL;
+ }
+ }
+}
+
+/**
+ * amdgpu_irq_add_id - register irq source
+ *
+ * @adev: amdgpu device pointer
+ * @src_id: source id for this source
+ * @source: irq source
+ *
+ */
+int amdgpu_irq_add_id(struct amdgpu_device *adev, unsigned src_id,
+ struct amdgpu_irq_src *source)
+{
+ if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
+ return -EINVAL;
+
+ if (adev->irq.sources[src_id] != NULL)
+ return -EINVAL;
+
+ if (!source->funcs)
+ 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.sources[src_id] = source;
+ return 0;
+}
+
+/**
+ * amdgpu_irq_dispatch - dispatch irq to IP blocks
+ *
+ * @adev: amdgpu device pointer
+ * @entry: interrupt vector
+ *
+ * Dispatches the irq to the different IP blocks
+ */
+void amdgpu_irq_dispatch(struct amdgpu_device *adev,
+ struct amdgpu_iv_entry *entry)
+{
+ unsigned src_id = entry->src_id;
+ struct amdgpu_irq_src *src;
+ int r;
+
+ if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
+ DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
+ return;
+ }
+
+ src = adev->irq.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 hw interrupt state
+ *
+ * @adev: amdgpu device pointer
+ * @src: interrupt src you want to enable
+ * @type: type of interrupt you want to update
+ *
+ * Updates the interrupt state for a specific src (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_get - enable interrupt
+ *
+ * @adev: amdgpu device pointer
+ * @src: interrupt src you want to enable
+ * @type: type of interrupt you want to enable
+ *
+ * Enables the interrupt type for a specific src (all asics).
+ */
+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;
+}
+
+bool amdgpu_irq_get_delayed(struct amdgpu_device *adev,
+ struct amdgpu_irq_src *src,
+ unsigned type)
+{
+ if ((type >= src->num_types) || !src->enabled_types)
+ return false;
+ return atomic_inc_return(&src->enabled_types[type]) == 1;
+}
+
+/**
+ * amdgpu_irq_put - disable interrupt
+ *
+ * @adev: amdgpu device pointer
+ * @src: interrupt src you want to disable
+ * @type: type of interrupt you want to disable
+ *
+ * Disables the interrupt type for a specific src (all asics).
+ */
+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 - test if irq is enabled or not
+ *
+ * @adev: amdgpu device pointer
+ * @idx: interrupt src you want to test
+ *
+ * Tests if the given interrupt source is enabled or not
+ */
+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]);
+}
Code Review / kvmfornfv.git / blobdiff