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"
36 #include "amdgpu_trace.h"
38 #include <linux/pm_runtime.h>
40 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
43 * Handle hotplug events outside the interrupt handler proper.
46 * amdgpu_hotplug_work_func - display hotplug work handler
50 * This is the hot plug event work handler (all asics).
51 * The work gets scheduled from the irq handler if there
52 * was a hot plug interrupt. It walks the connector table
53 * and calls the hotplug handler for each one, then sends
54 * a drm hotplug event to alert userspace.
56 static void amdgpu_hotplug_work_func(struct work_struct *work)
58 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
60 struct drm_device *dev = adev->ddev;
61 struct drm_mode_config *mode_config = &dev->mode_config;
62 struct drm_connector *connector;
64 mutex_lock(&mode_config->mutex);
65 list_for_each_entry(connector, &mode_config->connector_list, head)
66 amdgpu_connector_hotplug(connector);
67 mutex_unlock(&mode_config->mutex);
68 /* Just fire off a uevent and let userspace tell us what to do */
69 drm_helper_hpd_irq_event(dev);
73 * amdgpu_irq_reset_work_func - execute gpu reset
77 * Execute scheduled gpu reset (cayman+).
78 * This function is called when the irq handler
79 * thinks we need a gpu reset.
81 static void amdgpu_irq_reset_work_func(struct work_struct *work)
83 struct amdgpu_device *adev = container_of(work, struct amdgpu_device,
86 amdgpu_gpu_reset(adev);
89 /* Disable *all* interrupts */
90 static void amdgpu_irq_disable_all(struct amdgpu_device *adev)
92 unsigned long irqflags;
96 spin_lock_irqsave(&adev->irq.lock, irqflags);
97 for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
98 if (!adev->irq.client[i].sources)
101 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
102 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
104 if (!src || !src->funcs->set || !src->num_types)
107 for (k = 0; k < src->num_types; ++k) {
108 atomic_set(&src->enabled_types[k], 0);
109 r = src->funcs->set(adev, src, k,
110 AMDGPU_IRQ_STATE_DISABLE);
112 DRM_ERROR("error disabling interrupt (%d)\n",
117 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
121 * amdgpu_irq_preinstall - drm irq preinstall callback
123 * @dev: drm dev pointer
125 * Gets the hw ready to enable irqs (all asics).
126 * This function disables all interrupt sources on the GPU.
128 void amdgpu_irq_preinstall(struct drm_device *dev)
130 struct amdgpu_device *adev = dev->dev_private;
132 /* Disable *all* interrupts */
133 amdgpu_irq_disable_all(adev);
135 amdgpu_ih_process(adev);
139 * amdgpu_irq_postinstall - drm irq preinstall callback
141 * @dev: drm dev pointer
143 * Handles stuff to be done after enabling irqs (all asics).
144 * Returns 0 on success.
146 int amdgpu_irq_postinstall(struct drm_device *dev)
148 dev->max_vblank_count = 0x00ffffff;
153 * amdgpu_irq_uninstall - drm irq uninstall callback
155 * @dev: drm dev pointer
157 * This function disables all interrupt sources on the GPU (all asics).
159 void amdgpu_irq_uninstall(struct drm_device *dev)
161 struct amdgpu_device *adev = dev->dev_private;
166 amdgpu_irq_disable_all(adev);
170 * amdgpu_irq_handler - irq handler
172 * @int irq, void *arg: args
174 * This is the irq handler for the amdgpu driver (all asics).
176 irqreturn_t amdgpu_irq_handler(int irq, void *arg)
178 struct drm_device *dev = (struct drm_device *) arg;
179 struct amdgpu_device *adev = dev->dev_private;
182 ret = amdgpu_ih_process(adev);
183 if (ret == IRQ_HANDLED)
184 pm_runtime_mark_last_busy(dev->dev);
189 * amdgpu_msi_ok - asic specific msi checks
191 * @adev: amdgpu device pointer
193 * Handles asic specific MSI checks to determine if
194 * MSIs should be enabled on a particular chip (all asics).
195 * Returns true if MSIs should be enabled, false if MSIs
196 * should not be enabled.
198 static bool amdgpu_msi_ok(struct amdgpu_device *adev)
203 else if (amdgpu_msi == 0)
210 * amdgpu_irq_init - init driver interrupt info
212 * @adev: amdgpu device pointer
214 * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
215 * Returns 0 for success, error for failure.
217 int amdgpu_irq_init(struct amdgpu_device *adev)
221 spin_lock_init(&adev->irq.lock);
222 r = drm_vblank_init(adev->ddev, adev->mode_info.num_crtc);
228 adev->irq.msi_enabled = false;
230 if (amdgpu_msi_ok(adev)) {
231 int ret = pci_enable_msi(adev->pdev);
233 adev->irq.msi_enabled = true;
234 dev_info(adev->dev, "amdgpu: using MSI.\n");
238 INIT_WORK(&adev->hotplug_work, amdgpu_hotplug_work_func);
239 INIT_WORK(&adev->reset_work, amdgpu_irq_reset_work_func);
241 adev->irq.installed = true;
242 r = drm_irq_install(adev->ddev, adev->ddev->pdev->irq);
244 adev->irq.installed = false;
245 flush_work(&adev->hotplug_work);
246 cancel_work_sync(&adev->reset_work);
250 DRM_INFO("amdgpu: irq initialized.\n");
255 * amdgpu_irq_fini - tear down driver interrupt info
257 * @adev: amdgpu device pointer
259 * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
261 void amdgpu_irq_fini(struct amdgpu_device *adev)
265 drm_vblank_cleanup(adev->ddev);
266 if (adev->irq.installed) {
267 drm_irq_uninstall(adev->ddev);
268 adev->irq.installed = false;
269 if (adev->irq.msi_enabled)
270 pci_disable_msi(adev->pdev);
271 flush_work(&adev->hotplug_work);
272 cancel_work_sync(&adev->reset_work);
275 for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
276 if (!adev->irq.client[i].sources)
279 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
280 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
285 kfree(src->enabled_types);
286 src->enabled_types = NULL;
290 adev->irq.client[i].sources[j] = NULL;
293 kfree(adev->irq.client[i].sources);
298 * amdgpu_irq_add_id - register irq source
300 * @adev: amdgpu device pointer
301 * @src_id: source id for this source
302 * @source: irq source
305 int amdgpu_irq_add_id(struct amdgpu_device *adev,
306 unsigned client_id, unsigned src_id,
307 struct amdgpu_irq_src *source)
309 if (client_id >= AMDGPU_IH_CLIENTID_MAX)
312 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID)
318 if (!adev->irq.client[client_id].sources) {
319 adev->irq.client[client_id].sources = kcalloc(AMDGPU_MAX_IRQ_SRC_ID,
320 sizeof(struct amdgpu_irq_src),
322 if (!adev->irq.client[client_id].sources)
326 if (adev->irq.client[client_id].sources[src_id] != NULL)
329 if (source->num_types && !source->enabled_types) {
332 types = kcalloc(source->num_types, sizeof(atomic_t),
337 source->enabled_types = types;
340 adev->irq.client[client_id].sources[src_id] = source;
345 * amdgpu_irq_dispatch - dispatch irq to IP blocks
347 * @adev: amdgpu device pointer
348 * @entry: interrupt vector
350 * Dispatches the irq to the different IP blocks
352 void amdgpu_irq_dispatch(struct amdgpu_device *adev,
353 struct amdgpu_iv_entry *entry)
355 unsigned client_id = entry->client_id;
356 unsigned src_id = entry->src_id;
357 struct amdgpu_irq_src *src;
360 trace_amdgpu_iv(entry);
362 if (client_id >= AMDGPU_IH_CLIENTID_MAX) {
363 DRM_DEBUG("Invalid client_id in IV: %d\n", client_id);
367 if (src_id >= AMDGPU_MAX_IRQ_SRC_ID) {
368 DRM_DEBUG("Invalid src_id in IV: %d\n", src_id);
372 if (adev->irq.virq[src_id]) {
373 generic_handle_irq(irq_find_mapping(adev->irq.domain, src_id));
375 if (!adev->irq.client[client_id].sources) {
376 DRM_DEBUG("Unregistered interrupt client_id: %d src_id: %d\n",
381 src = adev->irq.client[client_id].sources[src_id];
383 DRM_DEBUG("Unhandled interrupt src_id: %d\n", src_id);
387 r = src->funcs->process(adev, src, entry);
389 DRM_ERROR("error processing interrupt (%d)\n", r);
394 * amdgpu_irq_update - update hw interrupt state
396 * @adev: amdgpu device pointer
397 * @src: interrupt src you want to enable
398 * @type: type of interrupt you want to update
400 * Updates the interrupt state for a specific src (all asics).
402 int amdgpu_irq_update(struct amdgpu_device *adev,
403 struct amdgpu_irq_src *src, unsigned type)
405 unsigned long irqflags;
406 enum amdgpu_interrupt_state state;
409 spin_lock_irqsave(&adev->irq.lock, irqflags);
411 /* we need to determine after taking the lock, otherwise
412 we might disable just enabled interrupts again */
413 if (amdgpu_irq_enabled(adev, src, type))
414 state = AMDGPU_IRQ_STATE_ENABLE;
416 state = AMDGPU_IRQ_STATE_DISABLE;
418 r = src->funcs->set(adev, src, type, state);
419 spin_unlock_irqrestore(&adev->irq.lock, irqflags);
423 void amdgpu_irq_gpu_reset_resume_helper(struct amdgpu_device *adev)
427 for (i = 0; i < AMDGPU_IH_CLIENTID_MAX; ++i) {
428 if (!adev->irq.client[i].sources)
431 for (j = 0; j < AMDGPU_MAX_IRQ_SRC_ID; ++j) {
432 struct amdgpu_irq_src *src = adev->irq.client[i].sources[j];
436 for (k = 0; k < src->num_types; k++)
437 amdgpu_irq_update(adev, src, k);
443 * amdgpu_irq_get - enable interrupt
445 * @adev: amdgpu device pointer
446 * @src: interrupt src you want to enable
447 * @type: type of interrupt you want to enable
449 * Enables the interrupt type for a specific src (all asics).
451 int amdgpu_irq_get(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
454 if (!adev->ddev->irq_enabled)
457 if (type >= src->num_types)
460 if (!src->enabled_types || !src->funcs->set)
463 if (atomic_inc_return(&src->enabled_types[type]) == 1)
464 return amdgpu_irq_update(adev, src, type);
470 * amdgpu_irq_put - disable interrupt
472 * @adev: amdgpu device pointer
473 * @src: interrupt src you want to disable
474 * @type: type of interrupt you want to disable
476 * Disables the interrupt type for a specific src (all asics).
478 int amdgpu_irq_put(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
481 if (!adev->ddev->irq_enabled)
484 if (type >= src->num_types)
487 if (!src->enabled_types || !src->funcs->set)
490 if (atomic_dec_and_test(&src->enabled_types[type]))
491 return amdgpu_irq_update(adev, src, type);
497 * amdgpu_irq_enabled - test if irq is enabled or not
499 * @adev: amdgpu device pointer
500 * @idx: interrupt src you want to test
502 * Tests if the given interrupt source is enabled or not
504 bool amdgpu_irq_enabled(struct amdgpu_device *adev, struct amdgpu_irq_src *src,
507 if (!adev->ddev->irq_enabled)
510 if (type >= src->num_types)
513 if (!src->enabled_types || !src->funcs->set)
516 return !!atomic_read(&src->enabled_types[type]);
520 static void amdgpu_irq_mask(struct irq_data *irqd)
525 static void amdgpu_irq_unmask(struct irq_data *irqd)
530 static struct irq_chip amdgpu_irq_chip = {
532 .irq_mask = amdgpu_irq_mask,
533 .irq_unmask = amdgpu_irq_unmask,
536 static int amdgpu_irqdomain_map(struct irq_domain *d,
537 unsigned int irq, irq_hw_number_t hwirq)
539 if (hwirq >= AMDGPU_MAX_IRQ_SRC_ID)
542 irq_set_chip_and_handler(irq,
543 &amdgpu_irq_chip, handle_simple_irq);
547 static const struct irq_domain_ops amdgpu_hw_irqdomain_ops = {
548 .map = amdgpu_irqdomain_map,
552 * amdgpu_irq_add_domain - create a linear irq domain
554 * @adev: amdgpu device pointer
556 * Create an irq domain for GPU interrupt sources
557 * that may be driven by another driver (e.g., ACP).
559 int amdgpu_irq_add_domain(struct amdgpu_device *adev)
561 adev->irq.domain = irq_domain_add_linear(NULL, AMDGPU_MAX_IRQ_SRC_ID,
562 &amdgpu_hw_irqdomain_ops, adev);
563 if (!adev->irq.domain) {
564 DRM_ERROR("GPU irq add domain failed\n");
572 * amdgpu_irq_remove_domain - remove the irq domain
574 * @adev: amdgpu device pointer
576 * Remove the irq domain for GPU interrupt sources
577 * that may be driven by another driver (e.g., ACP).
579 void amdgpu_irq_remove_domain(struct amdgpu_device *adev)
581 if (adev->irq.domain) {
582 irq_domain_remove(adev->irq.domain);
583 adev->irq.domain = NULL;
588 * amdgpu_irq_create_mapping - create a mapping between a domain irq and a
591 * @adev: amdgpu device pointer
592 * @src_id: IH source id
594 * Create a mapping between a domain irq (GPU IH src id) and a Linux irq
595 * Use this for components that generate a GPU interrupt, but are driven
596 * by a different driver (e.g., ACP).
597 * Returns the Linux irq.
599 unsigned amdgpu_irq_create_mapping(struct amdgpu_device *adev, unsigned src_id)
601 adev->irq.virq[src_id] = irq_create_mapping(adev->irq.domain, src_id);
603 return adev->irq.virq[src_id];