xref: /openbmc/linux/drivers/gpu/host1x/hw/channel_hw.c (revision 9a8f3203)
1 /*
2  * Tegra host1x Channel
3  *
4  * Copyright (c) 2010-2013, NVIDIA Corporation.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include <linux/host1x.h>
20 #include <linux/iommu.h>
21 #include <linux/slab.h>
22 
23 #include <trace/events/host1x.h>
24 
25 #include "../channel.h"
26 #include "../dev.h"
27 #include "../intr.h"
28 #include "../job.h"
29 
30 #define TRACE_MAX_LENGTH 128U
31 
32 static void trace_write_gather(struct host1x_cdma *cdma, struct host1x_bo *bo,
33 			       u32 offset, u32 words)
34 {
35 	struct device *dev = cdma_to_channel(cdma)->dev;
36 	void *mem = NULL;
37 
38 	if (host1x_debug_trace_cmdbuf)
39 		mem = host1x_bo_mmap(bo);
40 
41 	if (mem) {
42 		u32 i;
43 		/*
44 		 * Write in batches of 128 as there seems to be a limit
45 		 * of how much you can output to ftrace at once.
46 		 */
47 		for (i = 0; i < words; i += TRACE_MAX_LENGTH) {
48 			u32 num_words = min(words - i, TRACE_MAX_LENGTH);
49 
50 			offset += i * sizeof(u32);
51 
52 			trace_host1x_cdma_push_gather(dev_name(dev), bo,
53 						      num_words, offset,
54 						      mem);
55 		}
56 
57 		host1x_bo_munmap(bo, mem);
58 	}
59 }
60 
61 static void submit_gathers(struct host1x_job *job)
62 {
63 	struct host1x_cdma *cdma = &job->channel->cdma;
64 #if HOST1X_HW < 6
65 	struct device *dev = job->channel->dev;
66 #endif
67 	unsigned int i;
68 
69 	for (i = 0; i < job->num_gathers; i++) {
70 		struct host1x_job_gather *g = &job->gathers[i];
71 		dma_addr_t addr = g->base + g->offset;
72 		u32 op2, op3;
73 
74 		op2 = lower_32_bits(addr);
75 		op3 = upper_32_bits(addr);
76 
77 		trace_write_gather(cdma, g->bo, g->offset, g->words);
78 
79 		if (op3 != 0) {
80 #if HOST1X_HW >= 6
81 			u32 op1 = host1x_opcode_gather_wide(g->words);
82 			u32 op4 = HOST1X_OPCODE_NOP;
83 
84 			host1x_cdma_push_wide(cdma, op1, op2, op3, op4);
85 #else
86 			dev_err(dev, "invalid gather for push buffer %pad\n",
87 				&addr);
88 			continue;
89 #endif
90 		} else {
91 			u32 op1 = host1x_opcode_gather(g->words);
92 
93 			host1x_cdma_push(cdma, op1, op2);
94 		}
95 	}
96 }
97 
98 static inline void synchronize_syncpt_base(struct host1x_job *job)
99 {
100 	struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
101 	struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
102 	unsigned int id;
103 	u32 value;
104 
105 	value = host1x_syncpt_read_max(sp);
106 	id = sp->base->id;
107 
108 	host1x_cdma_push(&job->channel->cdma,
109 			 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
110 				HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
111 			 HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
112 			 HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
113 }
114 
115 static void host1x_channel_set_streamid(struct host1x_channel *channel)
116 {
117 #if HOST1X_HW >= 6
118 	struct iommu_fwspec *spec = dev_iommu_fwspec_get(channel->dev->parent);
119 	u32 sid = spec ? spec->ids[0] & 0xffff : 0x7f;
120 
121 	host1x_ch_writel(channel, sid, HOST1X_CHANNEL_SMMU_STREAMID);
122 #endif
123 }
124 
125 static int channel_submit(struct host1x_job *job)
126 {
127 	struct host1x_channel *ch = job->channel;
128 	struct host1x_syncpt *sp;
129 	u32 user_syncpt_incrs = job->syncpt_incrs;
130 	u32 prev_max = 0;
131 	u32 syncval;
132 	int err;
133 	struct host1x_waitlist *completed_waiter = NULL;
134 	struct host1x *host = dev_get_drvdata(ch->dev->parent);
135 
136 	sp = host->syncpt + job->syncpt_id;
137 	trace_host1x_channel_submit(dev_name(ch->dev),
138 				    job->num_gathers, job->num_relocs,
139 				    job->syncpt_id, job->syncpt_incrs);
140 
141 	/* before error checks, return current max */
142 	prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
143 
144 	/* get submit lock */
145 	err = mutex_lock_interruptible(&ch->submitlock);
146 	if (err)
147 		goto error;
148 
149 	completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
150 	if (!completed_waiter) {
151 		mutex_unlock(&ch->submitlock);
152 		err = -ENOMEM;
153 		goto error;
154 	}
155 
156 	host1x_channel_set_streamid(ch);
157 
158 	/* begin a CDMA submit */
159 	err = host1x_cdma_begin(&ch->cdma, job);
160 	if (err) {
161 		mutex_unlock(&ch->submitlock);
162 		goto error;
163 	}
164 
165 	if (job->serialize) {
166 		/*
167 		 * Force serialization by inserting a host wait for the
168 		 * previous job to finish before this one can commence.
169 		 */
170 		host1x_cdma_push(&ch->cdma,
171 				 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
172 					host1x_uclass_wait_syncpt_r(), 1),
173 				 host1x_class_host_wait_syncpt(job->syncpt_id,
174 					host1x_syncpt_read_max(sp)));
175 	}
176 
177 	/* Synchronize base register to allow using it for relative waiting */
178 	if (sp->base)
179 		synchronize_syncpt_base(job);
180 
181 	syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
182 
183 	host1x_hw_syncpt_assign_to_channel(host, sp, ch);
184 
185 	job->syncpt_end = syncval;
186 
187 	/* add a setclass for modules that require it */
188 	if (job->class)
189 		host1x_cdma_push(&ch->cdma,
190 				 host1x_opcode_setclass(job->class, 0, 0),
191 				 HOST1X_OPCODE_NOP);
192 
193 	submit_gathers(job);
194 
195 	/* end CDMA submit & stash pinned hMems into sync queue */
196 	host1x_cdma_end(&ch->cdma, job);
197 
198 	trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
199 
200 	/* schedule a submit complete interrupt */
201 	err = host1x_intr_add_action(host, sp, syncval,
202 				     HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
203 				     completed_waiter, NULL);
204 	completed_waiter = NULL;
205 	WARN(err, "Failed to set submit complete interrupt");
206 
207 	mutex_unlock(&ch->submitlock);
208 
209 	return 0;
210 
211 error:
212 	kfree(completed_waiter);
213 	return err;
214 }
215 
216 static void enable_gather_filter(struct host1x *host,
217 				 struct host1x_channel *ch)
218 {
219 #if HOST1X_HW >= 6
220 	u32 val;
221 
222 	if (!host->hv_regs)
223 		return;
224 
225 	val = host1x_hypervisor_readl(
226 		host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
227 	val |= BIT(ch->id % 32);
228 	host1x_hypervisor_writel(
229 		host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
230 #elif HOST1X_HW >= 4
231 	host1x_ch_writel(ch,
232 			 HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1),
233 			 HOST1X_CHANNEL_CHANNELCTRL);
234 #endif
235 }
236 
237 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
238 			       unsigned int index)
239 {
240 #if HOST1X_HW < 6
241 	ch->regs = dev->regs + index * 0x4000;
242 #else
243 	ch->regs = dev->regs + index * 0x100;
244 #endif
245 	enable_gather_filter(dev, ch);
246 	return 0;
247 }
248 
249 static const struct host1x_channel_ops host1x_channel_ops = {
250 	.init = host1x_channel_init,
251 	.submit = channel_submit,
252 };
253