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1/**************************************************************************
2 *
3 * Copyright © 2009-2015 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include <drm/drmP.h>
29#include "vmwgfx_drv.h"
30
31#define VMW_FENCE_WRAP (1 << 24)
32
33irqreturn_t vmw_irq_handler(int irq, void *arg)
34{
35 struct drm_device *dev = (struct drm_device *)arg;
36 struct vmw_private *dev_priv = vmw_priv(dev);
37 uint32_t status, masked_status;
38
39 status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
40 masked_status = status & READ_ONCE(dev_priv->irq_mask);
41
42 if (likely(status))
43 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
44
45 if (!status)
46 return IRQ_NONE;
47
48 if (masked_status & (SVGA_IRQFLAG_ANY_FENCE |
49 SVGA_IRQFLAG_FENCE_GOAL)) {
50 vmw_fences_update(dev_priv->fman);
51 wake_up_all(&dev_priv->fence_queue);
52 }
53
54 if (masked_status & SVGA_IRQFLAG_FIFO_PROGRESS)
55 wake_up_all(&dev_priv->fifo_queue);
56
57 if (masked_status & (SVGA_IRQFLAG_COMMAND_BUFFER |
58 SVGA_IRQFLAG_ERROR))
59 vmw_cmdbuf_tasklet_schedule(dev_priv->cman);
60
61 return IRQ_HANDLED;
62}
63
64static bool vmw_fifo_idle(struct vmw_private *dev_priv, uint32_t seqno)
65{
66
67 return (vmw_read(dev_priv, SVGA_REG_BUSY) == 0);
68}
69
70void vmw_update_seqno(struct vmw_private *dev_priv,
71 struct vmw_fifo_state *fifo_state)
72{
73 u32 *fifo_mem = dev_priv->mmio_virt;
74 uint32_t seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
75
76 if (dev_priv->last_read_seqno != seqno) {
77 dev_priv->last_read_seqno = seqno;
78 vmw_marker_pull(&fifo_state->marker_queue, seqno);
79 vmw_fences_update(dev_priv->fman);
80 }
81}
82
83bool vmw_seqno_passed(struct vmw_private *dev_priv,
84 uint32_t seqno)
85{
86 struct vmw_fifo_state *fifo_state;
87 bool ret;
88
89 if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
90 return true;
91
92 fifo_state = &dev_priv->fifo;
93 vmw_update_seqno(dev_priv, fifo_state);
94 if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
95 return true;
96
97 if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE) &&
98 vmw_fifo_idle(dev_priv, seqno))
99 return true;
100
101 /**
102 * Then check if the seqno is higher than what we've actually
103 * emitted. Then the fence is stale and signaled.
104 */
105
106 ret = ((atomic_read(&dev_priv->marker_seq) - seqno)
107 > VMW_FENCE_WRAP);
108
109 return ret;
110}
111
112int vmw_fallback_wait(struct vmw_private *dev_priv,
113 bool lazy,
114 bool fifo_idle,
115 uint32_t seqno,
116 bool interruptible,
117 unsigned long timeout)
118{
119 struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
120
121 uint32_t count = 0;
122 uint32_t signal_seq;
123 int ret;
124 unsigned long end_jiffies = jiffies + timeout;
125 bool (*wait_condition)(struct vmw_private *, uint32_t);
126 DEFINE_WAIT(__wait);
127
128 wait_condition = (fifo_idle) ? &vmw_fifo_idle :
129 &vmw_seqno_passed;
130
131 /**
132 * Block command submission while waiting for idle.
133 */
134
135 if (fifo_idle) {
136 down_read(&fifo_state->rwsem);
137 if (dev_priv->cman) {
138 ret = vmw_cmdbuf_idle(dev_priv->cman, interruptible,
139 10*HZ);
140 if (ret)
141 goto out_err;
142 }
143 }
144
145 signal_seq = atomic_read(&dev_priv->marker_seq);
146 ret = 0;
147
148 for (;;) {
149 prepare_to_wait(&dev_priv->fence_queue, &__wait,
150 (interruptible) ?
151 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
152 if (wait_condition(dev_priv, seqno))
153 break;
154 if (time_after_eq(jiffies, end_jiffies)) {
155 DRM_ERROR("SVGA device lockup.\n");
156 break;
157 }
158 if (lazy)
159 schedule_timeout(1);
160 else if ((++count & 0x0F) == 0) {
161 /**
162 * FIXME: Use schedule_hr_timeout here for
163 * newer kernels and lower CPU utilization.
164 */
165
166 __set_current_state(TASK_RUNNING);
167 schedule();
168 __set_current_state((interruptible) ?
169 TASK_INTERRUPTIBLE :
170 TASK_UNINTERRUPTIBLE);
171 }
172 if (interruptible && signal_pending(current)) {
173 ret = -ERESTARTSYS;
174 break;
175 }
176 }
177 finish_wait(&dev_priv->fence_queue, &__wait);
178 if (ret == 0 && fifo_idle) {
179 u32 *fifo_mem = dev_priv->mmio_virt;
180
181 vmw_mmio_write(signal_seq, fifo_mem + SVGA_FIFO_FENCE);
182 }
183 wake_up_all(&dev_priv->fence_queue);
184out_err:
185 if (fifo_idle)
186 up_read(&fifo_state->rwsem);
187
188 return ret;
189}
190
191void vmw_generic_waiter_add(struct vmw_private *dev_priv,
192 u32 flag, int *waiter_count)
193{
194 spin_lock_bh(&dev_priv->waiter_lock);
195 if ((*waiter_count)++ == 0) {
196 outl(flag, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
197 dev_priv->irq_mask |= flag;
198 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
199 }
200 spin_unlock_bh(&dev_priv->waiter_lock);
201}
202
203void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
204 u32 flag, int *waiter_count)
205{
206 spin_lock_bh(&dev_priv->waiter_lock);
207 if (--(*waiter_count) == 0) {
208 dev_priv->irq_mask &= ~flag;
209 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
210 }
211 spin_unlock_bh(&dev_priv->waiter_lock);
212}
213
214void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
215{
216 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
217 &dev_priv->fence_queue_waiters);
218}
219
220void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
221{
222 vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
223 &dev_priv->fence_queue_waiters);
224}
225
226void vmw_goal_waiter_add(struct vmw_private *dev_priv)
227{
228 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_FENCE_GOAL,
229 &dev_priv->goal_queue_waiters);
230}
231
232void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
233{
234 vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_FENCE_GOAL,
235 &dev_priv->goal_queue_waiters);
236}
237
238int vmw_wait_seqno(struct vmw_private *dev_priv,
239 bool lazy, uint32_t seqno,
240 bool interruptible, unsigned long timeout)
241{
242 long ret;
243 struct vmw_fifo_state *fifo = &dev_priv->fifo;
244
245 if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
246 return 0;
247
248 if (likely(vmw_seqno_passed(dev_priv, seqno)))
249 return 0;
250
251 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
252
253 if (!(fifo->capabilities & SVGA_FIFO_CAP_FENCE))
254 return vmw_fallback_wait(dev_priv, lazy, true, seqno,
255 interruptible, timeout);
256
257 if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
258 return vmw_fallback_wait(dev_priv, lazy, false, seqno,
259 interruptible, timeout);
260
261 vmw_seqno_waiter_add(dev_priv);
262
263 if (interruptible)
264 ret = wait_event_interruptible_timeout
265 (dev_priv->fence_queue,
266 vmw_seqno_passed(dev_priv, seqno),
267 timeout);
268 else
269 ret = wait_event_timeout
270 (dev_priv->fence_queue,
271 vmw_seqno_passed(dev_priv, seqno),
272 timeout);
273
274 vmw_seqno_waiter_remove(dev_priv);
275
276 if (unlikely(ret == 0))
277 ret = -EBUSY;
278 else if (likely(ret > 0))
279 ret = 0;
280
281 return ret;
282}
283
284void vmw_irq_preinstall(struct drm_device *dev)
285{
286 struct vmw_private *dev_priv = vmw_priv(dev);
287 uint32_t status;
288
289 if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
290 return;
291
292 status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
293 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
294}
295
296int vmw_irq_postinstall(struct drm_device *dev)
297{
298 return 0;
299}
300
301void vmw_irq_uninstall(struct drm_device *dev)
302{
303 struct vmw_private *dev_priv = vmw_priv(dev);
304 uint32_t status;
305
306 if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
307 return;
308
309 vmw_write(dev_priv, SVGA_REG_IRQMASK, 0);
310
311 status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
312 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
313}
1/**************************************************************************
2 *
3 * Copyright © 2009-2015 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include <drm/drmP.h>
29#include "vmwgfx_drv.h"
30
31#define VMW_FENCE_WRAP (1 << 24)
32
33/**
34 * vmw_thread_fn - Deferred (process context) irq handler
35 *
36 * @irq: irq number
37 * @arg: Closure argument. Pointer to a struct drm_device cast to void *
38 *
39 * This function implements the deferred part of irq processing.
40 * The function is guaranteed to run at least once after the
41 * vmw_irq_handler has returned with IRQ_WAKE_THREAD.
42 *
43 */
44static irqreturn_t vmw_thread_fn(int irq, void *arg)
45{
46 struct drm_device *dev = (struct drm_device *)arg;
47 struct vmw_private *dev_priv = vmw_priv(dev);
48 irqreturn_t ret = IRQ_NONE;
49
50 if (test_and_clear_bit(VMW_IRQTHREAD_FENCE,
51 dev_priv->irqthread_pending)) {
52 vmw_fences_update(dev_priv->fman);
53 wake_up_all(&dev_priv->fence_queue);
54 ret = IRQ_HANDLED;
55 }
56
57 if (test_and_clear_bit(VMW_IRQTHREAD_CMDBUF,
58 dev_priv->irqthread_pending)) {
59 vmw_cmdbuf_irqthread(dev_priv->cman);
60 ret = IRQ_HANDLED;
61 }
62
63 return ret;
64}
65
66/**
67 * vmw_irq_handler irq handler
68 *
69 * @irq: irq number
70 * @arg: Closure argument. Pointer to a struct drm_device cast to void *
71 *
72 * This function implements the quick part of irq processing.
73 * The function performs fast actions like clearing the device interrupt
74 * flags and also reasonably quick actions like waking processes waiting for
75 * FIFO space. Other IRQ actions are deferred to the IRQ thread.
76 */
77static irqreturn_t vmw_irq_handler(int irq, void *arg)
78{
79 struct drm_device *dev = (struct drm_device *)arg;
80 struct vmw_private *dev_priv = vmw_priv(dev);
81 uint32_t status, masked_status;
82 irqreturn_t ret = IRQ_HANDLED;
83
84 status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
85 masked_status = status & READ_ONCE(dev_priv->irq_mask);
86
87 if (likely(status))
88 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
89
90 if (!status)
91 return IRQ_NONE;
92
93 if (masked_status & SVGA_IRQFLAG_FIFO_PROGRESS)
94 wake_up_all(&dev_priv->fifo_queue);
95
96 if ((masked_status & (SVGA_IRQFLAG_ANY_FENCE |
97 SVGA_IRQFLAG_FENCE_GOAL)) &&
98 !test_and_set_bit(VMW_IRQTHREAD_FENCE, dev_priv->irqthread_pending))
99 ret = IRQ_WAKE_THREAD;
100
101 if ((masked_status & (SVGA_IRQFLAG_COMMAND_BUFFER |
102 SVGA_IRQFLAG_ERROR)) &&
103 !test_and_set_bit(VMW_IRQTHREAD_CMDBUF,
104 dev_priv->irqthread_pending))
105 ret = IRQ_WAKE_THREAD;
106
107 return ret;
108}
109
110static bool vmw_fifo_idle(struct vmw_private *dev_priv, uint32_t seqno)
111{
112
113 return (vmw_read(dev_priv, SVGA_REG_BUSY) == 0);
114}
115
116void vmw_update_seqno(struct vmw_private *dev_priv,
117 struct vmw_fifo_state *fifo_state)
118{
119 u32 *fifo_mem = dev_priv->mmio_virt;
120 uint32_t seqno = vmw_mmio_read(fifo_mem + SVGA_FIFO_FENCE);
121
122 if (dev_priv->last_read_seqno != seqno) {
123 dev_priv->last_read_seqno = seqno;
124 vmw_marker_pull(&fifo_state->marker_queue, seqno);
125 vmw_fences_update(dev_priv->fman);
126 }
127}
128
129bool vmw_seqno_passed(struct vmw_private *dev_priv,
130 uint32_t seqno)
131{
132 struct vmw_fifo_state *fifo_state;
133 bool ret;
134
135 if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
136 return true;
137
138 fifo_state = &dev_priv->fifo;
139 vmw_update_seqno(dev_priv, fifo_state);
140 if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
141 return true;
142
143 if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE) &&
144 vmw_fifo_idle(dev_priv, seqno))
145 return true;
146
147 /**
148 * Then check if the seqno is higher than what we've actually
149 * emitted. Then the fence is stale and signaled.
150 */
151
152 ret = ((atomic_read(&dev_priv->marker_seq) - seqno)
153 > VMW_FENCE_WRAP);
154
155 return ret;
156}
157
158int vmw_fallback_wait(struct vmw_private *dev_priv,
159 bool lazy,
160 bool fifo_idle,
161 uint32_t seqno,
162 bool interruptible,
163 unsigned long timeout)
164{
165 struct vmw_fifo_state *fifo_state = &dev_priv->fifo;
166
167 uint32_t count = 0;
168 uint32_t signal_seq;
169 int ret;
170 unsigned long end_jiffies = jiffies + timeout;
171 bool (*wait_condition)(struct vmw_private *, uint32_t);
172 DEFINE_WAIT(__wait);
173
174 wait_condition = (fifo_idle) ? &vmw_fifo_idle :
175 &vmw_seqno_passed;
176
177 /**
178 * Block command submission while waiting for idle.
179 */
180
181 if (fifo_idle) {
182 down_read(&fifo_state->rwsem);
183 if (dev_priv->cman) {
184 ret = vmw_cmdbuf_idle(dev_priv->cman, interruptible,
185 10*HZ);
186 if (ret)
187 goto out_err;
188 }
189 }
190
191 signal_seq = atomic_read(&dev_priv->marker_seq);
192 ret = 0;
193
194 for (;;) {
195 prepare_to_wait(&dev_priv->fence_queue, &__wait,
196 (interruptible) ?
197 TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
198 if (wait_condition(dev_priv, seqno))
199 break;
200 if (time_after_eq(jiffies, end_jiffies)) {
201 DRM_ERROR("SVGA device lockup.\n");
202 break;
203 }
204 if (lazy)
205 schedule_timeout(1);
206 else if ((++count & 0x0F) == 0) {
207 /**
208 * FIXME: Use schedule_hr_timeout here for
209 * newer kernels and lower CPU utilization.
210 */
211
212 __set_current_state(TASK_RUNNING);
213 schedule();
214 __set_current_state((interruptible) ?
215 TASK_INTERRUPTIBLE :
216 TASK_UNINTERRUPTIBLE);
217 }
218 if (interruptible && signal_pending(current)) {
219 ret = -ERESTARTSYS;
220 break;
221 }
222 }
223 finish_wait(&dev_priv->fence_queue, &__wait);
224 if (ret == 0 && fifo_idle) {
225 u32 *fifo_mem = dev_priv->mmio_virt;
226
227 vmw_mmio_write(signal_seq, fifo_mem + SVGA_FIFO_FENCE);
228 }
229 wake_up_all(&dev_priv->fence_queue);
230out_err:
231 if (fifo_idle)
232 up_read(&fifo_state->rwsem);
233
234 return ret;
235}
236
237void vmw_generic_waiter_add(struct vmw_private *dev_priv,
238 u32 flag, int *waiter_count)
239{
240 spin_lock_bh(&dev_priv->waiter_lock);
241 if ((*waiter_count)++ == 0) {
242 outl(flag, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
243 dev_priv->irq_mask |= flag;
244 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
245 }
246 spin_unlock_bh(&dev_priv->waiter_lock);
247}
248
249void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
250 u32 flag, int *waiter_count)
251{
252 spin_lock_bh(&dev_priv->waiter_lock);
253 if (--(*waiter_count) == 0) {
254 dev_priv->irq_mask &= ~flag;
255 vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
256 }
257 spin_unlock_bh(&dev_priv->waiter_lock);
258}
259
260void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
261{
262 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
263 &dev_priv->fence_queue_waiters);
264}
265
266void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
267{
268 vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
269 &dev_priv->fence_queue_waiters);
270}
271
272void vmw_goal_waiter_add(struct vmw_private *dev_priv)
273{
274 vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_FENCE_GOAL,
275 &dev_priv->goal_queue_waiters);
276}
277
278void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
279{
280 vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_FENCE_GOAL,
281 &dev_priv->goal_queue_waiters);
282}
283
284int vmw_wait_seqno(struct vmw_private *dev_priv,
285 bool lazy, uint32_t seqno,
286 bool interruptible, unsigned long timeout)
287{
288 long ret;
289 struct vmw_fifo_state *fifo = &dev_priv->fifo;
290
291 if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
292 return 0;
293
294 if (likely(vmw_seqno_passed(dev_priv, seqno)))
295 return 0;
296
297 vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
298
299 if (!(fifo->capabilities & SVGA_FIFO_CAP_FENCE))
300 return vmw_fallback_wait(dev_priv, lazy, true, seqno,
301 interruptible, timeout);
302
303 if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
304 return vmw_fallback_wait(dev_priv, lazy, false, seqno,
305 interruptible, timeout);
306
307 vmw_seqno_waiter_add(dev_priv);
308
309 if (interruptible)
310 ret = wait_event_interruptible_timeout
311 (dev_priv->fence_queue,
312 vmw_seqno_passed(dev_priv, seqno),
313 timeout);
314 else
315 ret = wait_event_timeout
316 (dev_priv->fence_queue,
317 vmw_seqno_passed(dev_priv, seqno),
318 timeout);
319
320 vmw_seqno_waiter_remove(dev_priv);
321
322 if (unlikely(ret == 0))
323 ret = -EBUSY;
324 else if (likely(ret > 0))
325 ret = 0;
326
327 return ret;
328}
329
330static void vmw_irq_preinstall(struct drm_device *dev)
331{
332 struct vmw_private *dev_priv = vmw_priv(dev);
333 uint32_t status;
334
335 status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
336 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
337}
338
339void vmw_irq_uninstall(struct drm_device *dev)
340{
341 struct vmw_private *dev_priv = vmw_priv(dev);
342 uint32_t status;
343
344 if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
345 return;
346
347 if (!dev->irq_enabled)
348 return;
349
350 vmw_write(dev_priv, SVGA_REG_IRQMASK, 0);
351
352 status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
353 outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
354
355 dev->irq_enabled = false;
356 free_irq(dev->irq, dev);
357}
358
359/**
360 * vmw_irq_install - Install the irq handlers
361 *
362 * @dev: Pointer to the drm device.
363 * @irq: The irq number.
364 * Return: Zero if successful. Negative number otherwise.
365 */
366int vmw_irq_install(struct drm_device *dev, int irq)
367{
368 int ret;
369
370 if (dev->irq_enabled)
371 return -EBUSY;
372
373 vmw_irq_preinstall(dev);
374
375 ret = request_threaded_irq(irq, vmw_irq_handler, vmw_thread_fn,
376 IRQF_SHARED, VMWGFX_DRIVER_NAME, dev);
377 if (ret < 0)
378 return ret;
379
380 dev->irq_enabled = true;
381 dev->irq = irq;
382
383 return ret;
384}