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/slab.h>
21
22#include <trace/events/host1x.h>
23
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
32static 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			offset += i * sizeof(u32);
50
51			trace_host1x_cdma_push_gather(dev_name(dev), bo,
52						      num_words, offset,
53						      mem);
54		}
55
56		host1x_bo_munmap(bo, mem);
57	}
58}
59
60static void submit_gathers(struct host1x_job *job)
61{
62	struct host1x_cdma *cdma = &job->channel->cdma;
63	unsigned int i;
64
65	for (i = 0; i < job->num_gathers; i++) {
66		struct host1x_job_gather *g = &job->gathers[i];
67		u32 op1 = host1x_opcode_gather(g->words);
68		u32 op2 = g->base + g->offset;
69		trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
70		host1x_cdma_push(cdma, op1, op2);
71	}
72}
73
74static inline void synchronize_syncpt_base(struct host1x_job *job)
75{
76	struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
77	struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
78	u32 id, value;
79
80	value = host1x_syncpt_read_max(sp);
81	id = sp->base->id;
82
83	host1x_cdma_push(&job->channel->cdma,
84			 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
85				HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
86			 HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
87			 HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
88}
89
90static int channel_submit(struct host1x_job *job)
91{
92	struct host1x_channel *ch = job->channel;
93	struct host1x_syncpt *sp;
94	u32 user_syncpt_incrs = job->syncpt_incrs;
95	u32 prev_max = 0;
96	u32 syncval;
97	int err;
98	struct host1x_waitlist *completed_waiter = NULL;
99	struct host1x *host = dev_get_drvdata(ch->dev->parent);
100
101	sp = host->syncpt + job->syncpt_id;
102	trace_host1x_channel_submit(dev_name(ch->dev),
103				    job->num_gathers, job->num_relocs,
104				    job->num_waitchk, job->syncpt_id,
105				    job->syncpt_incrs);
106
107	/* before error checks, return current max */
108	prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
109
110	/* get submit lock */
111	err = mutex_lock_interruptible(&ch->submitlock);
112	if (err)
113		goto error;
114
115	completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
116	if (!completed_waiter) {
117		mutex_unlock(&ch->submitlock);
118		err = -ENOMEM;
119		goto error;
120	}
121
122	/* begin a CDMA submit */
123	err = host1x_cdma_begin(&ch->cdma, job);
124	if (err) {
125		mutex_unlock(&ch->submitlock);
126		goto error;
127	}
128
129	if (job->serialize) {
130		/*
131		 * Force serialization by inserting a host wait for the
132		 * previous job to finish before this one can commence.
133		 */
134		host1x_cdma_push(&ch->cdma,
135				 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
136					host1x_uclass_wait_syncpt_r(), 1),
137				 host1x_class_host_wait_syncpt(job->syncpt_id,
138					host1x_syncpt_read_max(sp)));
139	}
140
141	/* Synchronize base register to allow using it for relative waiting */
142	if (sp->base)
143		synchronize_syncpt_base(job);
144
145	syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
146
147	job->syncpt_end = syncval;
148
149	/* add a setclass for modules that require it */
150	if (job->class)
151		host1x_cdma_push(&ch->cdma,
152				 host1x_opcode_setclass(job->class, 0, 0),
153				 HOST1X_OPCODE_NOP);
154
155	submit_gathers(job);
156
157	/* end CDMA submit & stash pinned hMems into sync queue */
158	host1x_cdma_end(&ch->cdma, job);
159
160	trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
161
162	/* schedule a submit complete interrupt */
163	err = host1x_intr_add_action(host, job->syncpt_id, syncval,
164				     HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
165				     completed_waiter, NULL);
166	completed_waiter = NULL;
167	WARN(err, "Failed to set submit complete interrupt");
168
169	mutex_unlock(&ch->submitlock);
170
171	return 0;
172
173error:
174	kfree(completed_waiter);
175	return err;
176}
177
178static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
179			       unsigned int index)
180{
181	ch->id = index;
182	mutex_init(&ch->reflock);
183	mutex_init(&ch->submitlock);
184
185	ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
186	return 0;
187}
188
189static const struct host1x_channel_ops host1x_channel_ops = {
190	.init = host1x_channel_init,
191	.submit = channel_submit,
192};
193