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/slab.h>
20 #include <trace/events/host1x.h>
21
22 #include "host1x.h"
23 #include "host1x_bo.h"
24 #include "channel.h"
25 #include "dev.h"
26 #include "intr.h"
27 #include "job.h"
28
29 #define HOST1X_CHANNEL_SIZE 16384
30 #define TRACE_MAX_LENGTH 128U
31
trace_write_gather(struct host1x_cdma * cdma,struct host1x_bo * bo,u32 offset,u32 words)32 static void trace_write_gather(struct host1x_cdma *cdma, struct host1x_bo *bo,
33 u32 offset, u32 words)
34 {
35 void *mem = NULL;
36
37 if (host1x_debug_trace_cmdbuf)
38 mem = host1x_bo_mmap(bo);
39
40 if (mem) {
41 u32 i;
42 /*
43 * Write in batches of 128 as there seems to be a limit
44 * of how much you can output to ftrace at once.
45 */
46 for (i = 0; i < words; i += TRACE_MAX_LENGTH) {
47 trace_host1x_cdma_push_gather(
48 dev_name(cdma_to_channel(cdma)->dev),
49 (u32)bo, min(words - i, TRACE_MAX_LENGTH),
50 offset + i * sizeof(u32), mem);
51 }
52 host1x_bo_munmap(bo, mem);
53 }
54 }
55
submit_gathers(struct host1x_job * job)56 static void submit_gathers(struct host1x_job *job)
57 {
58 struct host1x_cdma *cdma = &job->channel->cdma;
59 unsigned int i;
60
61 for (i = 0; i < job->num_gathers; i++) {
62 struct host1x_job_gather *g = &job->gathers[i];
63 u32 op1 = host1x_opcode_gather(g->words);
64 u32 op2 = g->base + g->offset;
65 trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
66 host1x_cdma_push(cdma, op1, op2);
67 }
68 }
69
channel_submit(struct host1x_job * job)70 static int channel_submit(struct host1x_job *job)
71 {
72 struct host1x_channel *ch = job->channel;
73 struct host1x_syncpt *sp;
74 u32 user_syncpt_incrs = job->syncpt_incrs;
75 u32 prev_max = 0;
76 u32 syncval;
77 int err;
78 struct host1x_waitlist *completed_waiter = NULL;
79 struct host1x *host = dev_get_drvdata(ch->dev->parent);
80
81 sp = host->syncpt + job->syncpt_id;
82 trace_host1x_channel_submit(dev_name(ch->dev),
83 job->num_gathers, job->num_relocs,
84 job->num_waitchk, job->syncpt_id,
85 job->syncpt_incrs);
86
87 /* before error checks, return current max */
88 prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
89
90 /* get submit lock */
91 err = mutex_lock_interruptible(&ch->submitlock);
92 if (err)
93 goto error;
94
95 completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
96 if (!completed_waiter) {
97 mutex_unlock(&ch->submitlock);
98 err = -ENOMEM;
99 goto error;
100 }
101
102 /* begin a CDMA submit */
103 err = host1x_cdma_begin(&ch->cdma, job);
104 if (err) {
105 mutex_unlock(&ch->submitlock);
106 goto error;
107 }
108
109 if (job->serialize) {
110 /*
111 * Force serialization by inserting a host wait for the
112 * previous job to finish before this one can commence.
113 */
114 host1x_cdma_push(&ch->cdma,
115 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
116 host1x_uclass_wait_syncpt_r(), 1),
117 host1x_class_host_wait_syncpt(job->syncpt_id,
118 host1x_syncpt_read_max(sp)));
119 }
120
121 syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
122
123 job->syncpt_end = syncval;
124
125 /* add a setclass for modules that require it */
126 if (job->class)
127 host1x_cdma_push(&ch->cdma,
128 host1x_opcode_setclass(job->class, 0, 0),
129 HOST1X_OPCODE_NOP);
130
131 submit_gathers(job);
132
133 /* end CDMA submit & stash pinned hMems into sync queue */
134 host1x_cdma_end(&ch->cdma, job);
135
136 trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
137
138 /* schedule a submit complete interrupt */
139 err = host1x_intr_add_action(host, job->syncpt_id, syncval,
140 HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
141 completed_waiter, NULL);
142 completed_waiter = NULL;
143 WARN(err, "Failed to set submit complete interrupt");
144
145 mutex_unlock(&ch->submitlock);
146
147 return 0;
148
149 error:
150 kfree(completed_waiter);
151 return err;
152 }
153
host1x_channel_init(struct host1x_channel * ch,struct host1x * dev,unsigned int index)154 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
155 unsigned int index)
156 {
157 ch->id = index;
158 mutex_init(&ch->reflock);
159 mutex_init(&ch->submitlock);
160
161 ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
162 return 0;
163 }
164
165 static const struct host1x_channel_ops host1x_channel_ops = {
166 .init = host1x_channel_init,
167 .submit = channel_submit,
168 };
169