2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
24 * Authors: Dave Airlie
28 #include <linux/irq.h>
30 #include <drm/drm_crtc_helper.h>
31 #include <drm/amdgpu_drm.h>
33 #include "amdgpu_ih.h"
35 #include "amdgpu_connectors.h"
37 #include <linux/pm_runtime.h>
39 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
42 * Handle hotplug events outside the interrupt handler proper.
45 * amdgpu_hotplug_work_func - display hotplug work handler
49 * This is the hot plug event work handler (all asics).
50 * The work gets scheduled from the irq handler if there
51 * was a hot plug interrupt. It walks the connector table
52 * and calls the hotplug handler for each one, then sends
53 * a drm hotplug event to alert userspace.
55 static void amdgpu_hotplug_work_func(struct work_struct *work)
57 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
59 struct drm_device *dev = adev->ddev;
60 struct drm_mode_config *mode_config = &dev->mode_config;
61 struct drm_connector *connector;
63 mutex_lock(&mode_config->mutex);
64 list_for_each_entry(connector, &mode_config->connector_list, head)
65 amdgpu_connector_hotplug(connector);
66 mutex_unlock(&mode_config->mutex);
67 /* Just fire off a uevent and let userspace tell us what to do */
68 drm_helper_hpd_irq_event(dev);
72 * amdgpu_irq_reset_work_func - execute gpu reset
76 * Execute scheduled gpu reset (cayman+).
77 * This function is called when the irq handler
78 * thinks we need a gpu reset.
80 static void amdgpu_irq_reset_work_func(struct work_struct *work)
82 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
85 amdgpu_gpu_reset(adev);
88 /* Disable *all* interrupts */
89 static void amdgpu_irq_disable_all(struct amdgpu_device *adev)
91 unsigned long irqflags;
95 spin_lock_irqsave(&adev->irq.lock, irqflags);
96 for (i = 0; i < AMDGPU_MAX_IRQ_SRC_ID; ++i) {
97 struct amdgpu_irq_src *src = adev->irq.sources[i];
99 if (!src || !src->funcs->set || !src->num_types)
102 for (j = 0; j < src->num_types; ++j) {
103 atomic_set(&src->enabled_types[j], 0);
104 r = src->funcs->set(adev, src, j,
105 AMDGPU_IRQ_STATE_DISABLE);
107 DRM_ERROR("error disabling interrupt (%d)\n",
111 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
115 * amdgpu_irq_preinstall - drm irq preinstall callback
117 * @dev: drm dev pointer
119 * Gets the hw ready to enable irqs (all asics).
120 * This function disables all interrupt sources on the GPU.
122 void amdgpu_irq_preinstall(struct drm_device *dev)
124 struct amdgpu_device *adev = dev->dev_private;
126 /* Disable *all* interrupts */
127 amdgpu_irq_disable_all(adev);
129 amdgpu_ih_process(adev);
133 * amdgpu_irq_postinstall - drm irq preinstall callback
135 * @dev: drm dev pointer
137 * Handles stuff to be done after enabling irqs (all asics).
138 * Returns 0 on success.
140 int amdgpu_irq_postinstall(struct drm_device *dev)
142 dev->max_vblank_count = 0x00ffffff;
147 * amdgpu_irq_uninstall - drm irq uninstall callback
149 * @dev: drm dev pointer
151 * This function disables all interrupt sources on the GPU (all asics).
153 void amdgpu_irq_uninstall(struct drm_device *dev)
155 struct amdgpu_device *adev = dev->dev_private;
160 amdgpu_irq_disable_all(adev);
164 * amdgpu_irq_handler - irq handler
166 * @int irq, void *arg: args
168 * This is the irq handler for the amdgpu driver (all asics).
170 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
172 struct drm_device *dev = (struct drm_device *) arg;
173 struct amdgpu_device *adev = dev->dev_private;
176 ret = amdgpu_ih_process(adev);
177 if (ret == IRQ_HANDLED)
178 pm_runtime_mark_last_busy(dev->dev);
183 * amdgpu_msi_ok - asic specific msi checks
185 * @adev: amdgpu device pointer
187 * Handles asic specific MSI checks to determine if
188 * MSIs should be enabled on a particular chip (all asics).
189 * Returns true if MSIs should be enabled, false if MSIs
190 * should not be enabled.
192 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
197 else if (amdgpu_msi == 0)
204 * amdgpu_irq_init - init driver interrupt info
206 * @adev: amdgpu device pointer
208 * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
209 * Returns 0 for success, error for failure.
211 int amdgpu_irq_init(struct amdgpu_device *adev)
215 spin_lock_init(&adev->irq.lock);
216 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
222 adev->irq.msi_enabled = false;
224 if (amdgpu_msi_ok(adev)) {
225 int ret = pci_enable_msi(adev->pdev);
227 adev->irq.msi_enabled = true;
228 dev_info(adev->dev, "amdgpu: using MSI.\n");
232 INIT_WORK(&adev->hotplug_work, amdgpu_hotplug_work_func);
233 INIT_WORK(&adev->reset_work, amdgpu_irq_reset_work_func);
235 adev->irq.installed = true;
236 r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
238 adev->irq.installed = false;
239 flush_work(&adev->hotplug_work);
240 cancel_work_sync(&adev->reset_work);
244 DRM_INFO("amdgpu: irq initialized.\n");
249 * amdgpu_irq_fini - tear down driver interrupt info
251 * @adev: amdgpu device pointer
253 * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
255 void amdgpu_irq_fini(struct amdgpu_device *adev)
259 drm_vblank_cleanup(adev->ddev);
260 if (adev->irq.installed) {
261 drm_irq_uninstall(adev->ddev);
262 adev->irq.installed = false;
263 if (adev->irq.msi_enabled)
264 pci_disable_msi(adev->pdev);
265 flush_work(&adev->hotplug_work);
266 cancel_work_sync(&adev->reset_work);
269 for (i = 0; i < AMDGPU_MAX_IRQ_SRC_ID; ++i) {
270 struct amdgpu_irq_src *src = adev->irq.sources[i];
275 kfree(src->enabled_types);
276 src->enabled_types = NULL;
280 adev->irq.sources[i] = NULL;
286 * amdgpu_irq_add_id - register irq source
288 * @adev: amdgpu device pointer
289 * @src_id: source id for this source
290 * @source: irq source
293 int amdgpu_irq_add_id(struct amdgpu_device *adev, unsigned src_id,
294 struct amdgpu_irq_src *source)
296 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
299 if (adev->irq.sources[src_id] != NULL)
305 if (source->num_types && !source->enabled_types) {
308 types = kcalloc(source->num_types, sizeof(atomic_t),
313 source->enabled_types = types;
316 adev->irq.sources[src_id] = source;
322 * amdgpu_irq_dispatch - dispatch irq to IP blocks
324 * @adev: amdgpu device pointer
325 * @entry: interrupt vector
327 * Dispatches the irq to the different IP blocks
329 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
330 struct amdgpu_iv_entry *entry)
332 unsigned src_id = entry->src_id;
333 struct amdgpu_irq_src *src;
336 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
337 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
341 if (adev->irq.virq[src_id]) {
342 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
344 src = adev->irq.sources[src_id];
346 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
350 r = src->funcs->process(adev, src, entry);
352 DRM_ERROR("error processing interrupt (%d)\n", r);
357 * amdgpu_irq_update - update hw interrupt state
359 * @adev: amdgpu device pointer
360 * @src: interrupt src you want to enable
361 * @type: type of interrupt you want to update
363 * Updates the interrupt state for a specific src (all asics).
365 int amdgpu_irq_update(struct amdgpu_device *adev,
366 struct amdgpu_irq_src *src, unsigned type)
368 unsigned long irqflags;
369 enum amdgpu_interrupt_state state;
372 spin_lock_irqsave(&adev->irq.lock, irqflags);
374 /* we need to determine after taking the lock, otherwise
375 we might disable just enabled interrupts again */
376 if (amdgpu_irq_enabled(adev, src, type))
377 state = AMDGPU_IRQ_STATE_ENABLE;
379 state = AMDGPU_IRQ_STATE_DISABLE;
381 r = src->funcs->set(adev, src, type, state);
382 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
386 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
389 for (i = 0; i < AMDGPU_MAX_IRQ_SRC_ID; i++) {
390 struct amdgpu_irq_src *src = adev->irq.sources[i];
393 for (j = 0; j < src->num_types; j++)
394 amdgpu_irq_update(adev, src, j);
399 * amdgpu_irq_get - enable interrupt
401 * @adev: amdgpu device pointer
402 * @src: interrupt src you want to enable
403 * @type: type of interrupt you want to enable
405 * Enables the interrupt type for a specific src (all asics).
407 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
410 if (!adev->ddev->irq_enabled)
413 if (type >= src->num_types)
416 if (!src->enabled_types || !src->funcs->set)
419 if (atomic_inc_return(&src->enabled_types[type]) == 1)
420 return amdgpu_irq_update(adev, src, type);
426 * amdgpu_irq_put - disable interrupt
428 * @adev: amdgpu device pointer
429 * @src: interrupt src you want to disable
430 * @type: type of interrupt you want to disable
432 * Disables the interrupt type for a specific src (all asics).
434 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
437 if (!adev->ddev->irq_enabled)
440 if (type >= src->num_types)
443 if (!src->enabled_types || !src->funcs->set)
446 if (atomic_dec_and_test(&src->enabled_types[type]))
447 return amdgpu_irq_update(adev, src, type);
453 * amdgpu_irq_enabled - test if irq is enabled or not
455 * @adev: amdgpu device pointer
456 * @idx: interrupt src you want to test
458 * Tests if the given interrupt source is enabled or not
460 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
463 if (!adev->ddev->irq_enabled)
466 if (type >= src->num_types)
469 if (!src->enabled_types || !src->funcs->set)
472 return !!atomic_read(&src->enabled_types[type]);
476 static void amdgpu_irq_mask(struct irq_data *irqd)
481 static void amdgpu_irq_unmask(struct irq_data *irqd)
486 static struct irq_chip amdgpu_irq_chip = {
488 .irq_mask = amdgpu_irq_mask,
489 .irq_unmask = amdgpu_irq_unmask,
492 static int amdgpu_irqdomain_map(struct irq_domain *d,
493 unsigned int irq, irq_hw_number_t hwirq)
495 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
498 irq_set_chip_and_handler(irq,
499 &amdgpu_irq_chip, handle_simple_irq);
503 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
504 .map = amdgpu_irqdomain_map,
508 * amdgpu_irq_add_domain - create a linear irq domain
510 * @adev: amdgpu device pointer
512 * Create an irq domain for GPU interrupt sources
513 * that may be driven by another driver (e.g., ACP).
515 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
517 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
518 &amdgpu_hw_irqdomain_ops, adev);
519 if (!adev->irq.domain) {
520 DRM_ERROR("GPU irq add domain failed\n");
528 * amdgpu_irq_remove_domain - remove the irq domain
530 * @adev: amdgpu device pointer
532 * Remove the irq domain for GPU interrupt sources
533 * that may be driven by another driver (e.g., ACP).
535 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
537 if (adev->irq.domain) {
538 irq_domain_remove(adev->irq.domain);
539 adev->irq.domain = NULL;
544 * amdgpu_irq_create_mapping - create a mapping between a domain irq and a
547 * @adev: amdgpu device pointer
548 * @src_id: IH source id
550 * Create a mapping between a domain irq (GPU IH src id) and a Linux irq
551 * Use this for components that generate a GPU interrupt, but are driven
552 * by a different driver (e.g., ACP).
553 * Returns the Linux irq.
555 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
557 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
559 return adev->irq.virq[src_id];