2 * Tegra host1x Command DMA
4 * Copyright (c) 2010-2013, NVIDIA Corporation.
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.
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
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/>.
19 #include <linux/slab.h>
20 #include <linux/scatterlist.h>
21 #include <linux/dma-mapping.h>
24 #include "../channel.h"
29 * Put the restart at the end of pushbuffer memory
31 static void push_buffer_init(struct push_buffer *pb)
33 *(u32 *)(pb->mapped + pb->size) = host1x_opcode_restart(0);
37 * Increment timedout buffer's syncpt via CPU.
39 static void cdma_timeout_cpu_incr(struct host1x_cdma *cdma, u32 getptr,
40 u32 syncpt_incrs, u32 syncval, u32 nr_slots)
42 struct host1x *host1x = cdma_to_host1x(cdma);
43 struct push_buffer *pb = &cdma->push_buffer;
46 for (i = 0; i < syncpt_incrs; i++)
47 host1x_syncpt_incr(cdma->timeout.syncpt);
49 /* after CPU incr, ensure shadow is up to date */
50 host1x_syncpt_load(cdma->timeout.syncpt);
52 /* NOP all the PB slots */
54 u32 *p = (u32 *)(pb->mapped + getptr);
55 *(p++) = HOST1X_OPCODE_NOP;
56 *(p++) = HOST1X_OPCODE_NOP;
57 dev_dbg(host1x->dev, "%s: NOP at %pad+%#x\n", __func__,
59 getptr = (getptr + 8) & (pb->size - 1);
68 static void cdma_start(struct host1x_cdma *cdma)
70 struct host1x_channel *ch = cdma_to_channel(cdma);
75 cdma->last_pos = cdma->push_buffer.pos;
77 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
78 HOST1X_CHANNEL_DMACTRL);
80 /* set base, put and end pointer */
81 host1x_ch_writel(ch, cdma->push_buffer.dma, HOST1X_CHANNEL_DMASTART);
82 host1x_ch_writel(ch, cdma->push_buffer.pos, HOST1X_CHANNEL_DMAPUT);
83 host1x_ch_writel(ch, cdma->push_buffer.dma + cdma->push_buffer.size + 4,
84 HOST1X_CHANNEL_DMAEND);
87 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP |
88 HOST1X_CHANNEL_DMACTRL_DMAGETRST |
89 HOST1X_CHANNEL_DMACTRL_DMAINITGET,
90 HOST1X_CHANNEL_DMACTRL);
92 /* start the command DMA */
93 host1x_ch_writel(ch, 0, HOST1X_CHANNEL_DMACTRL);
99 * Similar to cdma_start(), but rather than starting from an idle
100 * state (where DMA GET is set to DMA PUT), on a timeout we restore
101 * DMA GET from an explicit value (so DMA may again be pending).
103 static void cdma_timeout_restart(struct host1x_cdma *cdma, u32 getptr)
105 struct host1x *host1x = cdma_to_host1x(cdma);
106 struct host1x_channel *ch = cdma_to_channel(cdma);
111 cdma->last_pos = cdma->push_buffer.pos;
113 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
114 HOST1X_CHANNEL_DMACTRL);
116 /* set base, end pointer (all of memory) */
117 host1x_ch_writel(ch, cdma->push_buffer.dma, HOST1X_CHANNEL_DMASTART);
118 host1x_ch_writel(ch, cdma->push_buffer.dma + cdma->push_buffer.size,
119 HOST1X_CHANNEL_DMAEND);
121 /* set GET, by loading the value in PUT (then reset GET) */
122 host1x_ch_writel(ch, getptr, HOST1X_CHANNEL_DMAPUT);
123 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP |
124 HOST1X_CHANNEL_DMACTRL_DMAGETRST |
125 HOST1X_CHANNEL_DMACTRL_DMAINITGET,
126 HOST1X_CHANNEL_DMACTRL);
129 "%s: DMA GET 0x%x, PUT HW 0x%x / shadow 0x%x\n", __func__,
130 host1x_ch_readl(ch, HOST1X_CHANNEL_DMAGET),
131 host1x_ch_readl(ch, HOST1X_CHANNEL_DMAPUT),
134 /* deassert GET reset and set PUT */
135 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
136 HOST1X_CHANNEL_DMACTRL);
137 host1x_ch_writel(ch, cdma->push_buffer.pos, HOST1X_CHANNEL_DMAPUT);
139 /* start the command DMA */
140 host1x_ch_writel(ch, 0, HOST1X_CHANNEL_DMACTRL);
142 cdma->running = true;
146 * Kick channel DMA into action by writing its PUT offset (if it has changed)
148 static void cdma_flush(struct host1x_cdma *cdma)
150 struct host1x_channel *ch = cdma_to_channel(cdma);
152 if (cdma->push_buffer.pos != cdma->last_pos) {
153 host1x_ch_writel(ch, cdma->push_buffer.pos,
154 HOST1X_CHANNEL_DMAPUT);
155 cdma->last_pos = cdma->push_buffer.pos;
159 static void cdma_stop(struct host1x_cdma *cdma)
161 struct host1x_channel *ch = cdma_to_channel(cdma);
163 mutex_lock(&cdma->lock);
166 host1x_cdma_wait_locked(cdma, CDMA_EVENT_SYNC_QUEUE_EMPTY);
167 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
168 HOST1X_CHANNEL_DMACTRL);
169 cdma->running = false;
172 mutex_unlock(&cdma->lock);
176 * Stops both channel's command processor and CDMA immediately.
177 * Also, tears down the channel and resets corresponding module.
179 static void cdma_freeze(struct host1x_cdma *cdma)
181 struct host1x *host = cdma_to_host1x(cdma);
182 struct host1x_channel *ch = cdma_to_channel(cdma);
185 if (cdma->torndown && !cdma->running) {
186 dev_warn(host->dev, "Already torn down\n");
190 dev_dbg(host->dev, "freezing channel (id %d)\n", ch->id);
192 cmdproc_stop = host1x_sync_readl(host, HOST1X_SYNC_CMDPROC_STOP);
193 cmdproc_stop |= BIT(ch->id);
194 host1x_sync_writel(host, cmdproc_stop, HOST1X_SYNC_CMDPROC_STOP);
196 dev_dbg(host->dev, "%s: DMA GET 0x%x, PUT HW 0x%x / shadow 0x%x\n",
197 __func__, host1x_ch_readl(ch, HOST1X_CHANNEL_DMAGET),
198 host1x_ch_readl(ch, HOST1X_CHANNEL_DMAPUT),
201 host1x_ch_writel(ch, HOST1X_CHANNEL_DMACTRL_DMASTOP,
202 HOST1X_CHANNEL_DMACTRL);
204 host1x_sync_writel(host, BIT(ch->id), HOST1X_SYNC_CH_TEARDOWN);
206 cdma->running = false;
207 cdma->torndown = true;
210 static void cdma_resume(struct host1x_cdma *cdma, u32 getptr)
212 struct host1x *host1x = cdma_to_host1x(cdma);
213 struct host1x_channel *ch = cdma_to_channel(cdma);
217 "resuming channel (id %u, DMAGET restart = 0x%x)\n",
220 cmdproc_stop = host1x_sync_readl(host1x, HOST1X_SYNC_CMDPROC_STOP);
221 cmdproc_stop &= ~BIT(ch->id);
222 host1x_sync_writel(host1x, cmdproc_stop, HOST1X_SYNC_CMDPROC_STOP);
224 cdma->torndown = false;
225 cdma_timeout_restart(cdma, getptr);
229 * If this timeout fires, it indicates the current sync_queue entry has
230 * exceeded its TTL and the userctx should be timed out and remaining
231 * submits already issued cleaned up (future submits return an error).
233 static void cdma_timeout_handler(struct work_struct *work)
235 u32 prev_cmdproc, cmdproc_stop, syncpt_val;
236 struct host1x_cdma *cdma;
237 struct host1x *host1x;
238 struct host1x_channel *ch;
240 cdma = container_of(to_delayed_work(work), struct host1x_cdma,
242 host1x = cdma_to_host1x(cdma);
243 ch = cdma_to_channel(cdma);
245 host1x_debug_dump(cdma_to_host1x(cdma));
247 mutex_lock(&cdma->lock);
249 if (!cdma->timeout.client) {
251 "cdma_timeout: expired, but has no clientid\n");
252 mutex_unlock(&cdma->lock);
256 /* stop processing to get a clean snapshot */
257 prev_cmdproc = host1x_sync_readl(host1x, HOST1X_SYNC_CMDPROC_STOP);
258 cmdproc_stop = prev_cmdproc | BIT(ch->id);
259 host1x_sync_writel(host1x, cmdproc_stop, HOST1X_SYNC_CMDPROC_STOP);
261 dev_dbg(host1x->dev, "cdma_timeout: cmdproc was 0x%x is 0x%x\n",
262 prev_cmdproc, cmdproc_stop);
264 syncpt_val = host1x_syncpt_load(cdma->timeout.syncpt);
266 /* has buffer actually completed? */
267 if ((s32)(syncpt_val - cdma->timeout.syncpt_val) >= 0) {
269 "cdma_timeout: expired, but buffer had completed\n");
271 cmdproc_stop = prev_cmdproc & ~(BIT(ch->id));
272 host1x_sync_writel(host1x, cmdproc_stop,
273 HOST1X_SYNC_CMDPROC_STOP);
274 mutex_unlock(&cdma->lock);
278 dev_warn(host1x->dev, "%s: timeout: %u (%s), HW thresh %d, done %d\n",
279 __func__, cdma->timeout.syncpt->id, cdma->timeout.syncpt->name,
280 syncpt_val, cdma->timeout.syncpt_val);
282 /* stop HW, resetting channel/module */
283 host1x_hw_cdma_freeze(host1x, cdma);
285 host1x_cdma_update_sync_queue(cdma, ch->dev);
286 mutex_unlock(&cdma->lock);
290 * Init timeout resources
292 static int cdma_timeout_init(struct host1x_cdma *cdma, unsigned int syncpt)
294 INIT_DELAYED_WORK(&cdma->timeout.wq, cdma_timeout_handler);
295 cdma->timeout.initialized = true;
301 * Clean up timeout resources
303 static void cdma_timeout_destroy(struct host1x_cdma *cdma)
305 if (cdma->timeout.initialized)
306 cancel_delayed_work(&cdma->timeout.wq);
308 cdma->timeout.initialized = false;
311 static const struct host1x_cdma_ops host1x_cdma_ops = {
316 .timeout_init = cdma_timeout_init,
317 .timeout_destroy = cdma_timeout_destroy,
318 .freeze = cdma_freeze,
319 .resume = cdma_resume,
320 .timeout_cpu_incr = cdma_timeout_cpu_incr,
323 static const struct host1x_pushbuffer_ops host1x_pushbuffer_ops = {
324 .init = push_buffer_init,