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};