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 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 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 60 static 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 74 static 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 90 static 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; 172 173 error: 174 kfree(completed_waiter); 175 return err; 176 } 177 178 static 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 } 188 189 static const struct host1x_channel_ops host1x_channel_ops = { 190 .init = host1x_channel_init, 191 .submit = channel_submit, 192 }; 193