1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
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:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
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.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  *          Christian König
28  */
29 #include <linux/seq_file.h>
30 #include <linux/slab.h>
31 #include <drm/drmP.h>
32 #include <drm/amdgpu_drm.h>
33 #include "amdgpu.h"
34 #include "atom.h"
35 
36 #define AMDGPU_IB_TEST_TIMEOUT	msecs_to_jiffies(1000)
37 
38 /*
39  * IB
40  * IBs (Indirect Buffers) and areas of GPU accessible memory where
41  * commands are stored.  You can put a pointer to the IB in the
42  * command ring and the hw will fetch the commands from the IB
43  * and execute them.  Generally userspace acceleration drivers
44  * produce command buffers which are send to the kernel and
45  * put in IBs for execution by the requested ring.
46  */
47 static int amdgpu_debugfs_sa_init(struct amdgpu_device *adev);
48 
49 /**
50  * amdgpu_ib_get - request an IB (Indirect Buffer)
51  *
52  * @ring: ring index the IB is associated with
53  * @size: requested IB size
54  * @ib: IB object returned
55  *
56  * Request an IB (all asics).  IBs are allocated using the
57  * suballocator.
58  * Returns 0 on success, error on failure.
59  */
60 int amdgpu_ib_get(struct amdgpu_device *adev, struct amdgpu_vm *vm,
61 		  unsigned size, struct amdgpu_ib *ib)
62 {
63 	int r;
64 
65 	if (size) {
66 		r = amdgpu_sa_bo_new(&adev->ring_tmp_bo,
67 				      &ib->sa_bo, size, 256);
68 		if (r) {
69 			dev_err(adev->dev, "failed to get a new IB (%d)\n", r);
70 			return r;
71 		}
72 
73 		ib->ptr = amdgpu_sa_bo_cpu_addr(ib->sa_bo);
74 
75 		if (!vm)
76 			ib->gpu_addr = amdgpu_sa_bo_gpu_addr(ib->sa_bo);
77 	}
78 
79 	return 0;
80 }
81 
82 /**
83  * amdgpu_ib_free - free an IB (Indirect Buffer)
84  *
85  * @adev: amdgpu_device pointer
86  * @ib: IB object to free
87  * @f: the fence SA bo need wait on for the ib alloation
88  *
89  * Free an IB (all asics).
90  */
91 void amdgpu_ib_free(struct amdgpu_device *adev, struct amdgpu_ib *ib,
92 		    struct fence *f)
93 {
94 	amdgpu_sa_bo_free(adev, &ib->sa_bo, f);
95 }
96 
97 /**
98  * amdgpu_ib_schedule - schedule an IB (Indirect Buffer) on the ring
99  *
100  * @adev: amdgpu_device pointer
101  * @num_ibs: number of IBs to schedule
102  * @ibs: IB objects to schedule
103  * @f: fence created during this submission
104  *
105  * Schedule an IB on the associated ring (all asics).
106  * Returns 0 on success, error on failure.
107  *
108  * On SI, there are two parallel engines fed from the primary ring,
109  * the CE (Constant Engine) and the DE (Drawing Engine).  Since
110  * resource descriptors have moved to memory, the CE allows you to
111  * prime the caches while the DE is updating register state so that
112  * the resource descriptors will be already in cache when the draw is
113  * processed.  To accomplish this, the userspace driver submits two
114  * IBs, one for the CE and one for the DE.  If there is a CE IB (called
115  * a CONST_IB), it will be put on the ring prior to the DE IB.  Prior
116  * to SI there was just a DE IB.
117  */
118 int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
119 		       struct amdgpu_ib *ibs, struct fence *last_vm_update,
120 		       struct amdgpu_job *job, struct fence **f)
121 {
122 	struct amdgpu_device *adev = ring->adev;
123 	struct amdgpu_ib *ib = &ibs[0];
124 	bool skip_preamble, need_ctx_switch;
125 	unsigned patch_offset = ~0;
126 	struct amdgpu_vm *vm;
127 	uint64_t ctx;
128 
129 	unsigned i;
130 	int r = 0;
131 
132 	if (num_ibs == 0)
133 		return -EINVAL;
134 
135 	/* ring tests don't use a job */
136 	if (job) {
137 		vm = job->vm;
138 		ctx = job->ctx;
139 	} else {
140 		vm = NULL;
141 		ctx = 0;
142 	}
143 
144 	if (!ring->ready) {
145 		dev_err(adev->dev, "couldn't schedule ib\n");
146 		return -EINVAL;
147 	}
148 
149 	if (vm && !job->vm_id) {
150 		dev_err(adev->dev, "VM IB without ID\n");
151 		return -EINVAL;
152 	}
153 
154 	r = amdgpu_ring_alloc(ring, 256 * num_ibs);
155 	if (r) {
156 		dev_err(adev->dev, "scheduling IB failed (%d).\n", r);
157 		return r;
158 	}
159 
160 	if (ring->type == AMDGPU_RING_TYPE_SDMA && ring->funcs->init_cond_exec)
161 		patch_offset = amdgpu_ring_init_cond_exec(ring);
162 
163 	if (vm) {
164 		r = amdgpu_vm_flush(ring, job);
165 		if (r) {
166 			amdgpu_ring_undo(ring);
167 			return r;
168 		}
169 	}
170 
171 	if (ring->funcs->emit_hdp_flush)
172 		amdgpu_ring_emit_hdp_flush(ring);
173 
174 	/* always set cond_exec_polling to CONTINUE */
175 	*ring->cond_exe_cpu_addr = 1;
176 
177 	skip_preamble = ring->current_ctx == ctx;
178 	need_ctx_switch = ring->current_ctx != ctx;
179 	for (i = 0; i < num_ibs; ++i) {
180 		ib = &ibs[i];
181 
182 		/* drop preamble IBs if we don't have a context switch */
183 		if ((ib->flags & AMDGPU_IB_FLAG_PREAMBLE) && skip_preamble)
184 			continue;
185 
186 		amdgpu_ring_emit_ib(ring, ib, job ? job->vm_id : 0,
187 				    need_ctx_switch);
188 		need_ctx_switch = false;
189 	}
190 
191 	if (ring->funcs->emit_hdp_invalidate)
192 		amdgpu_ring_emit_hdp_invalidate(ring);
193 
194 	r = amdgpu_fence_emit(ring, f);
195 	if (r) {
196 		dev_err(adev->dev, "failed to emit fence (%d)\n", r);
197 		if (job && job->vm_id)
198 			amdgpu_vm_reset_id(adev, job->vm_id);
199 		amdgpu_ring_undo(ring);
200 		return r;
201 	}
202 
203 	/* wrap the last IB with fence */
204 	if (job && job->uf_addr) {
205 		amdgpu_ring_emit_fence(ring, job->uf_addr, job->uf_sequence,
206 				       AMDGPU_FENCE_FLAG_64BIT);
207 	}
208 
209 	if (patch_offset != ~0 && ring->funcs->patch_cond_exec)
210 		amdgpu_ring_patch_cond_exec(ring, patch_offset);
211 
212 	ring->current_ctx = ctx;
213 	amdgpu_ring_commit(ring);
214 	return 0;
215 }
216 
217 /**
218  * amdgpu_ib_pool_init - Init the IB (Indirect Buffer) pool
219  *
220  * @adev: amdgpu_device pointer
221  *
222  * Initialize the suballocator to manage a pool of memory
223  * for use as IBs (all asics).
224  * Returns 0 on success, error on failure.
225  */
226 int amdgpu_ib_pool_init(struct amdgpu_device *adev)
227 {
228 	int r;
229 
230 	if (adev->ib_pool_ready) {
231 		return 0;
232 	}
233 	r = amdgpu_sa_bo_manager_init(adev, &adev->ring_tmp_bo,
234 				      AMDGPU_IB_POOL_SIZE*64*1024,
235 				      AMDGPU_GPU_PAGE_SIZE,
236 				      AMDGPU_GEM_DOMAIN_GTT);
237 	if (r) {
238 		return r;
239 	}
240 
241 	r = amdgpu_sa_bo_manager_start(adev, &adev->ring_tmp_bo);
242 	if (r) {
243 		return r;
244 	}
245 
246 	adev->ib_pool_ready = true;
247 	if (amdgpu_debugfs_sa_init(adev)) {
248 		dev_err(adev->dev, "failed to register debugfs file for SA\n");
249 	}
250 	return 0;
251 }
252 
253 /**
254  * amdgpu_ib_pool_fini - Free the IB (Indirect Buffer) pool
255  *
256  * @adev: amdgpu_device pointer
257  *
258  * Tear down the suballocator managing the pool of memory
259  * for use as IBs (all asics).
260  */
261 void amdgpu_ib_pool_fini(struct amdgpu_device *adev)
262 {
263 	if (adev->ib_pool_ready) {
264 		amdgpu_sa_bo_manager_suspend(adev, &adev->ring_tmp_bo);
265 		amdgpu_sa_bo_manager_fini(adev, &adev->ring_tmp_bo);
266 		adev->ib_pool_ready = false;
267 	}
268 }
269 
270 /**
271  * amdgpu_ib_ring_tests - test IBs on the rings
272  *
273  * @adev: amdgpu_device pointer
274  *
275  * Test an IB (Indirect Buffer) on each ring.
276  * If the test fails, disable the ring.
277  * Returns 0 on success, error if the primary GFX ring
278  * IB test fails.
279  */
280 int amdgpu_ib_ring_tests(struct amdgpu_device *adev)
281 {
282 	unsigned i;
283 	int r, ret = 0;
284 
285 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
286 		struct amdgpu_ring *ring = adev->rings[i];
287 
288 		if (!ring || !ring->ready)
289 			continue;
290 
291 		r = amdgpu_ring_test_ib(ring, AMDGPU_IB_TEST_TIMEOUT);
292 		if (r) {
293 			ring->ready = false;
294 
295 			if (ring == &adev->gfx.gfx_ring[0]) {
296 				/* oh, oh, that's really bad */
297 				DRM_ERROR("amdgpu: failed testing IB on GFX ring (%d).\n", r);
298 				adev->accel_working = false;
299 				return r;
300 
301 			} else {
302 				/* still not good, but we can live with it */
303 				DRM_ERROR("amdgpu: failed testing IB on ring %d (%d).\n", i, r);
304 				ret = r;
305 			}
306 		}
307 	}
308 	return ret;
309 }
310 
311 /*
312  * Debugfs info
313  */
314 #if defined(CONFIG_DEBUG_FS)
315 
316 static int amdgpu_debugfs_sa_info(struct seq_file *m, void *data)
317 {
318 	struct drm_info_node *node = (struct drm_info_node *) m->private;
319 	struct drm_device *dev = node->minor->dev;
320 	struct amdgpu_device *adev = dev->dev_private;
321 
322 	amdgpu_sa_bo_dump_debug_info(&adev->ring_tmp_bo, m);
323 
324 	return 0;
325 
326 }
327 
328 static const struct drm_info_list amdgpu_debugfs_sa_list[] = {
329 	{"amdgpu_sa_info", &amdgpu_debugfs_sa_info, 0, NULL},
330 };
331 
332 #endif
333 
334 static int amdgpu_debugfs_sa_init(struct amdgpu_device *adev)
335 {
336 #if defined(CONFIG_DEBUG_FS)
337 	return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_sa_list, 1);
338 #else
339 	return 0;
340 #endif
341 }
342