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 50 offset += i * sizeof(u32); 51 52 trace_host1x_cdma_push_gather(dev_name(dev), bo, 53 num_words, offset, 54 mem); 55 } 56 57 host1x_bo_munmap(bo, mem); 58 } 59 } 60 61 static void submit_gathers(struct host1x_job *job) 62 { 63 struct host1x_cdma *cdma = &job->channel->cdma; 64 unsigned int i; 65 66 for (i = 0; i < job->num_gathers; i++) { 67 struct host1x_job_gather *g = &job->gathers[i]; 68 u32 op1 = host1x_opcode_gather(g->words); 69 u32 op2 = g->base + g->offset; 70 71 trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff); 72 host1x_cdma_push(cdma, op1, op2); 73 } 74 } 75 76 static inline void synchronize_syncpt_base(struct host1x_job *job) 77 { 78 struct host1x *host = dev_get_drvdata(job->channel->dev->parent); 79 struct host1x_syncpt *sp = host->syncpt + job->syncpt_id; 80 unsigned int id; 81 u32 value; 82 83 value = host1x_syncpt_read_max(sp); 84 id = sp->base->id; 85 86 host1x_cdma_push(&job->channel->cdma, 87 host1x_opcode_setclass(HOST1X_CLASS_HOST1X, 88 HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1), 89 HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) | 90 HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value)); 91 } 92 93 static int channel_submit(struct host1x_job *job) 94 { 95 struct host1x_channel *ch = job->channel; 96 struct host1x_syncpt *sp; 97 u32 user_syncpt_incrs = job->syncpt_incrs; 98 u32 prev_max = 0; 99 u32 syncval; 100 int err; 101 struct host1x_waitlist *completed_waiter = NULL; 102 struct host1x *host = dev_get_drvdata(ch->dev->parent); 103 104 sp = host->syncpt + job->syncpt_id; 105 trace_host1x_channel_submit(dev_name(ch->dev), 106 job->num_gathers, job->num_relocs, 107 job->num_waitchk, job->syncpt_id, 108 job->syncpt_incrs); 109 110 /* before error checks, return current max */ 111 prev_max = job->syncpt_end = host1x_syncpt_read_max(sp); 112 113 /* get submit lock */ 114 err = mutex_lock_interruptible(&ch->submitlock); 115 if (err) 116 goto error; 117 118 completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL); 119 if (!completed_waiter) { 120 mutex_unlock(&ch->submitlock); 121 err = -ENOMEM; 122 goto error; 123 } 124 125 /* begin a CDMA submit */ 126 err = host1x_cdma_begin(&ch->cdma, job); 127 if (err) { 128 mutex_unlock(&ch->submitlock); 129 goto error; 130 } 131 132 if (job->serialize) { 133 /* 134 * Force serialization by inserting a host wait for the 135 * previous job to finish before this one can commence. 136 */ 137 host1x_cdma_push(&ch->cdma, 138 host1x_opcode_setclass(HOST1X_CLASS_HOST1X, 139 host1x_uclass_wait_syncpt_r(), 1), 140 host1x_class_host_wait_syncpt(job->syncpt_id, 141 host1x_syncpt_read_max(sp))); 142 } 143 144 /* Synchronize base register to allow using it for relative waiting */ 145 if (sp->base) 146 synchronize_syncpt_base(job); 147 148 syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs); 149 150 host1x_hw_syncpt_assign_to_channel(host, sp, ch); 151 152 job->syncpt_end = syncval; 153 154 /* add a setclass for modules that require it */ 155 if (job->class) 156 host1x_cdma_push(&ch->cdma, 157 host1x_opcode_setclass(job->class, 0, 0), 158 HOST1X_OPCODE_NOP); 159 160 submit_gathers(job); 161 162 /* end CDMA submit & stash pinned hMems into sync queue */ 163 host1x_cdma_end(&ch->cdma, job); 164 165 trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval); 166 167 /* schedule a submit complete interrupt */ 168 err = host1x_intr_add_action(host, job->syncpt_id, syncval, 169 HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch, 170 completed_waiter, NULL); 171 completed_waiter = NULL; 172 WARN(err, "Failed to set submit complete interrupt"); 173 174 mutex_unlock(&ch->submitlock); 175 176 return 0; 177 178 error: 179 kfree(completed_waiter); 180 return err; 181 } 182 183 static void enable_gather_filter(struct host1x *host, 184 struct host1x_channel *ch) 185 { 186 #if HOST1X_HW >= 6 187 u32 val; 188 189 if (!host->hv_regs) 190 return; 191 192 val = host1x_hypervisor_readl( 193 host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); 194 val |= BIT(ch->id % 32); 195 host1x_hypervisor_writel( 196 host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); 197 #elif HOST1X_HW >= 4 198 host1x_ch_writel(ch, 199 HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1), 200 HOST1X_CHANNEL_CHANNELCTRL); 201 #endif 202 } 203 204 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev, 205 unsigned int index) 206 { 207 ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE; 208 enable_gather_filter(dev, ch); 209 return 0; 210 } 211 212 static const struct host1x_channel_ops host1x_channel_ops = { 213 .init = host1x_channel_init, 214 .submit = channel_submit, 215 }; 216