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 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 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 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 } 153 154 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