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1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3  *
4  * Copyright 2009-2015 VMware, Inc., Palo Alto, CA., USA
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 <linux/pci.h>
29 #include <linux/sched/signal.h>
30 
31 #include "vmwgfx_drv.h"
32 
33 #define VMW_FENCE_WRAP (1 << 24)
34 
vmw_irqflag_fence_goal(struct vmw_private * vmw)35 static u32 vmw_irqflag_fence_goal(struct vmw_private *vmw)
36 {
37 	if ((vmw->capabilities2 & SVGA_CAP2_EXTRA_REGS) != 0)
38 		return SVGA_IRQFLAG_REG_FENCE_GOAL;
39 	else
40 		return SVGA_IRQFLAG_FENCE_GOAL;
41 }
42 
43 /**
44  * vmw_thread_fn - Deferred (process context) irq handler
45  *
46  * @irq: irq number
47  * @arg: Closure argument. Pointer to a struct drm_device cast to void *
48  *
49  * This function implements the deferred part of irq processing.
50  * The function is guaranteed to run at least once after the
51  * vmw_irq_handler has returned with IRQ_WAKE_THREAD.
52  *
53  */
vmw_thread_fn(int irq,void * arg)54 static irqreturn_t vmw_thread_fn(int irq, void *arg)
55 {
56 	struct drm_device *dev = (struct drm_device *)arg;
57 	struct vmw_private *dev_priv = vmw_priv(dev);
58 	irqreturn_t ret = IRQ_NONE;
59 
60 	if (test_and_clear_bit(VMW_IRQTHREAD_FENCE,
61 			       dev_priv->irqthread_pending)) {
62 		vmw_fences_update(dev_priv->fman);
63 		wake_up_all(&dev_priv->fence_queue);
64 		ret = IRQ_HANDLED;
65 	}
66 
67 	if (test_and_clear_bit(VMW_IRQTHREAD_CMDBUF,
68 			       dev_priv->irqthread_pending)) {
69 		vmw_cmdbuf_irqthread(dev_priv->cman);
70 		ret = IRQ_HANDLED;
71 	}
72 
73 	return ret;
74 }
75 
76 /**
77  * vmw_irq_handler: irq handler
78  *
79  * @irq: irq number
80  * @arg: Closure argument. Pointer to a struct drm_device cast to void *
81  *
82  * This function implements the quick part of irq processing.
83  * The function performs fast actions like clearing the device interrupt
84  * flags and also reasonably quick actions like waking processes waiting for
85  * FIFO space. Other IRQ actions are deferred to the IRQ thread.
86  */
vmw_irq_handler(int irq,void * arg)87 static irqreturn_t vmw_irq_handler(int irq, void *arg)
88 {
89 	struct drm_device *dev = (struct drm_device *)arg;
90 	struct vmw_private *dev_priv = vmw_priv(dev);
91 	uint32_t status, masked_status;
92 	irqreturn_t ret = IRQ_HANDLED;
93 
94 	status = vmw_irq_status_read(dev_priv);
95 	masked_status = status & READ_ONCE(dev_priv->irq_mask);
96 
97 	if (likely(status))
98 		vmw_irq_status_write(dev_priv, status);
99 
100 	if (!status)
101 		return IRQ_NONE;
102 
103 	if (masked_status & SVGA_IRQFLAG_FIFO_PROGRESS)
104 		wake_up_all(&dev_priv->fifo_queue);
105 
106 	if ((masked_status & (SVGA_IRQFLAG_ANY_FENCE |
107 			      vmw_irqflag_fence_goal(dev_priv))) &&
108 	    !test_and_set_bit(VMW_IRQTHREAD_FENCE, dev_priv->irqthread_pending))
109 		ret = IRQ_WAKE_THREAD;
110 
111 	if ((masked_status & (SVGA_IRQFLAG_COMMAND_BUFFER |
112 			      SVGA_IRQFLAG_ERROR)) &&
113 	    !test_and_set_bit(VMW_IRQTHREAD_CMDBUF,
114 			      dev_priv->irqthread_pending))
115 		ret = IRQ_WAKE_THREAD;
116 
117 	return ret;
118 }
119 
vmw_fifo_idle(struct vmw_private * dev_priv,uint32_t seqno)120 static bool vmw_fifo_idle(struct vmw_private *dev_priv, uint32_t seqno)
121 {
122 
123 	return (vmw_read(dev_priv, SVGA_REG_BUSY) == 0);
124 }
125 
vmw_update_seqno(struct vmw_private * dev_priv)126 void vmw_update_seqno(struct vmw_private *dev_priv)
127 {
128 	uint32_t seqno = vmw_fence_read(dev_priv);
129 
130 	if (dev_priv->last_read_seqno != seqno) {
131 		dev_priv->last_read_seqno = seqno;
132 		vmw_fences_update(dev_priv->fman);
133 	}
134 }
135 
vmw_seqno_passed(struct vmw_private * dev_priv,uint32_t seqno)136 bool vmw_seqno_passed(struct vmw_private *dev_priv,
137 			 uint32_t seqno)
138 {
139 	bool ret;
140 
141 	if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
142 		return true;
143 
144 	vmw_update_seqno(dev_priv);
145 	if (likely(dev_priv->last_read_seqno - seqno < VMW_FENCE_WRAP))
146 		return true;
147 
148 	if (!vmw_has_fences(dev_priv) && vmw_fifo_idle(dev_priv, seqno))
149 		return true;
150 
151 	/**
152 	 * Then check if the seqno is higher than what we've actually
153 	 * emitted. Then the fence is stale and signaled.
154 	 */
155 
156 	ret = ((atomic_read(&dev_priv->marker_seq) - seqno)
157 	       > VMW_FENCE_WRAP);
158 
159 	return ret;
160 }
161 
vmw_fallback_wait(struct vmw_private * dev_priv,bool lazy,bool fifo_idle,uint32_t seqno,bool interruptible,unsigned long timeout)162 int vmw_fallback_wait(struct vmw_private *dev_priv,
163 		      bool lazy,
164 		      bool fifo_idle,
165 		      uint32_t seqno,
166 		      bool interruptible,
167 		      unsigned long timeout)
168 {
169 	struct vmw_fifo_state *fifo_state = dev_priv->fifo;
170 	bool fifo_down = false;
171 
172 	uint32_t count = 0;
173 	uint32_t signal_seq;
174 	int ret;
175 	unsigned long end_jiffies = jiffies + timeout;
176 	bool (*wait_condition)(struct vmw_private *, uint32_t);
177 	DEFINE_WAIT(__wait);
178 
179 	wait_condition = (fifo_idle) ? &vmw_fifo_idle :
180 		&vmw_seqno_passed;
181 
182 	/**
183 	 * Block command submission while waiting for idle.
184 	 */
185 
186 	if (fifo_idle) {
187 		if (dev_priv->cman) {
188 			ret = vmw_cmdbuf_idle(dev_priv->cman, interruptible,
189 					      10*HZ);
190 			if (ret)
191 				goto out_err;
192 		} else if (fifo_state) {
193 			down_read(&fifo_state->rwsem);
194 			fifo_down = true;
195 		}
196 	}
197 
198 	signal_seq = atomic_read(&dev_priv->marker_seq);
199 	ret = 0;
200 
201 	for (;;) {
202 		prepare_to_wait(&dev_priv->fence_queue, &__wait,
203 				(interruptible) ?
204 				TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
205 		if (wait_condition(dev_priv, seqno))
206 			break;
207 		if (time_after_eq(jiffies, end_jiffies)) {
208 			DRM_ERROR("SVGA device lockup.\n");
209 			break;
210 		}
211 		if (lazy)
212 			schedule_timeout(1);
213 		else if ((++count & 0x0F) == 0) {
214 			/**
215 			 * FIXME: Use schedule_hr_timeout here for
216 			 * newer kernels and lower CPU utilization.
217 			 */
218 
219 			__set_current_state(TASK_RUNNING);
220 			schedule();
221 			__set_current_state((interruptible) ?
222 					    TASK_INTERRUPTIBLE :
223 					    TASK_UNINTERRUPTIBLE);
224 		}
225 		if (interruptible && signal_pending(current)) {
226 			ret = -ERESTARTSYS;
227 			break;
228 		}
229 	}
230 	finish_wait(&dev_priv->fence_queue, &__wait);
231 	if (ret == 0 && fifo_idle && fifo_state)
232 		vmw_fence_write(dev_priv, signal_seq);
233 
234 	wake_up_all(&dev_priv->fence_queue);
235 out_err:
236 	if (fifo_down)
237 		up_read(&fifo_state->rwsem);
238 
239 	return ret;
240 }
241 
vmw_generic_waiter_add(struct vmw_private * dev_priv,u32 flag,int * waiter_count)242 void vmw_generic_waiter_add(struct vmw_private *dev_priv,
243 			    u32 flag, int *waiter_count)
244 {
245 	spin_lock_bh(&dev_priv->waiter_lock);
246 	if ((*waiter_count)++ == 0) {
247 		vmw_irq_status_write(dev_priv, flag);
248 		dev_priv->irq_mask |= flag;
249 		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
250 	}
251 	spin_unlock_bh(&dev_priv->waiter_lock);
252 }
253 
vmw_generic_waiter_remove(struct vmw_private * dev_priv,u32 flag,int * waiter_count)254 void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
255 			       u32 flag, int *waiter_count)
256 {
257 	spin_lock_bh(&dev_priv->waiter_lock);
258 	if (--(*waiter_count) == 0) {
259 		dev_priv->irq_mask &= ~flag;
260 		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
261 	}
262 	spin_unlock_bh(&dev_priv->waiter_lock);
263 }
264 
vmw_seqno_waiter_add(struct vmw_private * dev_priv)265 void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
266 {
267 	vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
268 			       &dev_priv->fence_queue_waiters);
269 }
270 
vmw_seqno_waiter_remove(struct vmw_private * dev_priv)271 void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
272 {
273 	vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
274 				  &dev_priv->fence_queue_waiters);
275 }
276 
vmw_goal_waiter_add(struct vmw_private * dev_priv)277 void vmw_goal_waiter_add(struct vmw_private *dev_priv)
278 {
279 	vmw_generic_waiter_add(dev_priv, vmw_irqflag_fence_goal(dev_priv),
280 			       &dev_priv->goal_queue_waiters);
281 }
282 
vmw_goal_waiter_remove(struct vmw_private * dev_priv)283 void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
284 {
285 	vmw_generic_waiter_remove(dev_priv, vmw_irqflag_fence_goal(dev_priv),
286 				  &dev_priv->goal_queue_waiters);
287 }
288 
vmw_irq_preinstall(struct drm_device * dev)289 static void vmw_irq_preinstall(struct drm_device *dev)
290 {
291 	struct vmw_private *dev_priv = vmw_priv(dev);
292 	uint32_t status;
293 
294 	status = vmw_irq_status_read(dev_priv);
295 	vmw_irq_status_write(dev_priv, status);
296 }
297 
vmw_irq_uninstall(struct drm_device * dev)298 void vmw_irq_uninstall(struct drm_device *dev)
299 {
300 	struct vmw_private *dev_priv = vmw_priv(dev);
301 	struct pci_dev *pdev = to_pci_dev(dev->dev);
302 	uint32_t status;
303 
304 	if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
305 		return;
306 
307 	vmw_write(dev_priv, SVGA_REG_IRQMASK, 0);
308 
309 	status = vmw_irq_status_read(dev_priv);
310 	vmw_irq_status_write(dev_priv, status);
311 
312 	free_irq(pdev->irq, dev);
313 }
314 
315 /**
316  * vmw_irq_install - Install the irq handlers
317  *
318  * @dev:  Pointer to the drm device.
319  * @irq:  The irq number.
320  * Return:  Zero if successful. Negative number otherwise.
321  */
vmw_irq_install(struct drm_device * dev,int irq)322 int vmw_irq_install(struct drm_device *dev, int irq)
323 {
324 	vmw_irq_preinstall(dev);
325 
326 	return request_threaded_irq(irq, vmw_irq_handler, vmw_thread_fn,
327 				    IRQF_SHARED, VMWGFX_DRIVER_NAME, dev);
328 }
329