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->syncpt_id, job->syncpt_incrs); 108 109 /* before error checks, return current max */ 110 prev_max = job->syncpt_end = host1x_syncpt_read_max(sp); 111 112 /* get submit lock */ 113 err = mutex_lock_interruptible(&ch->submitlock); 114 if (err) 115 goto error; 116 117 completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL); 118 if (!completed_waiter) { 119 mutex_unlock(&ch->submitlock); 120 err = -ENOMEM; 121 goto error; 122 } 123 124 /* begin a CDMA submit */ 125 err = host1x_cdma_begin(&ch->cdma, job); 126 if (err) { 127 mutex_unlock(&ch->submitlock); 128 goto error; 129 } 130 131 if (job->serialize) { 132 /* 133 * Force serialization by inserting a host wait for the 134 * previous job to finish before this one can commence. 135 */ 136 host1x_cdma_push(&ch->cdma, 137 host1x_opcode_setclass(HOST1X_CLASS_HOST1X, 138 host1x_uclass_wait_syncpt_r(), 1), 139 host1x_class_host_wait_syncpt(job->syncpt_id, 140 host1x_syncpt_read_max(sp))); 141 } 142 143 /* Synchronize base register to allow using it for relative waiting */ 144 if (sp->base) 145 synchronize_syncpt_base(job); 146 147 syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs); 148 149 host1x_hw_syncpt_assign_to_channel(host, sp, ch); 150 151 job->syncpt_end = syncval; 152 153 /* add a setclass for modules that require it */ 154 if (job->class) 155 host1x_cdma_push(&ch->cdma, 156 host1x_opcode_setclass(job->class, 0, 0), 157 HOST1X_OPCODE_NOP); 158 159 submit_gathers(job); 160 161 /* end CDMA submit & stash pinned hMems into sync queue */ 162 host1x_cdma_end(&ch->cdma, job); 163 164 trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval); 165 166 /* schedule a submit complete interrupt */ 167 err = host1x_intr_add_action(host, sp, syncval, 168 HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch, 169 completed_waiter, NULL); 170 completed_waiter = NULL; 171 WARN(err, "Failed to set submit complete interrupt"); 172 173 mutex_unlock(&ch->submitlock); 174 175 return 0; 176 177 error: 178 kfree(completed_waiter); 179 return err; 180 } 181 182 static void enable_gather_filter(struct host1x *host, 183 struct host1x_channel *ch) 184 { 185 #if HOST1X_HW >= 6 186 u32 val; 187 188 if (!host->hv_regs) 189 return; 190 191 val = host1x_hypervisor_readl( 192 host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); 193 val |= BIT(ch->id % 32); 194 host1x_hypervisor_writel( 195 host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32)); 196 #elif HOST1X_HW >= 4 197 host1x_ch_writel(ch, 198 HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1), 199 HOST1X_CHANNEL_CHANNELCTRL); 200 #endif 201 } 202 203 static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev, 204 unsigned int index) 205 { 206 ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE; 207 enable_gather_filter(dev, ch); 208 return 0; 209 } 210 211 static const struct host1x_channel_ops host1x_channel_ops = { 212 .init = host1x_channel_init, 213 .submit = channel_submit, 214 }; 215