text: /*
   * Tegra host1x Channel
   *
   * Copyright (c) 2010-2013, NVIDIA Corporation.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/host1x.h>
  #include <linux/slab.h>
  
  #include <trace/events/host1x.h>
  
  #include "../channel.h"
  #include "../dev.h"
  #include "../intr.h"
  #include "../job.h"
  
  #define HOST1X_CHANNEL_SIZE 16384
  #define TRACE_MAX_LENGTH 128U
  
  static void trace_write_gather(struct host1x_cdma *cdma, struct host1x_bo *bo,
  			       u32 offset, u32 words)
  {
  	struct device *dev = cdma_to_channel(cdma)->dev;
  	void *mem = NULL;
  
  	if (host1x_debug_trace_cmdbuf)
  		mem = host1x_bo_mmap(bo);
  
  	if (mem) {
  		u32 i;
  		/*
  		 * Write in batches of 128 as there seems to be a limit
  		 * of how much you can output to ftrace at once.
  		 */
  		for (i = 0; i < words; i += TRACE_MAX_LENGTH) {
  			u32 num_words = min(words - i, TRACE_MAX_LENGTH);
  
  			offset += i * sizeof(u32);
  
  			trace_host1x_cdma_push_gather(dev_name(dev), bo,
  						      num_words, offset,
  						      mem);
  		}
  
  		host1x_bo_munmap(bo, mem);
  	}
  }
  
  static void submit_gathers(struct host1x_job *job)
  {
  	struct host1x_cdma *cdma = &job->channel->cdma;
  	unsigned int i;
  
  	for (i = 0; i < job->num_gathers; i++) {
  		struct host1x_job_gather *g = &job->gathers[i];
  		u32 op1 = host1x_opcode_gather(g->words);
  		u32 op2 = g->base + g->offset;
  
  		trace_write_gather(cdma, g->bo, g->offset, op1 & 0xffff);
  		host1x_cdma_push(cdma, op1, op2);
  	}
  }
  
  static inline void synchronize_syncpt_base(struct host1x_job *job)
  {
  	struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
  	struct host1x_syncpt *sp = host->syncpt + job->syncpt_id;
  	unsigned int id;
  	u32 value;
  
  	value = host1x_syncpt_read_max(sp);
  	id = sp->base->id;
  
  	host1x_cdma_push(&job->channel->cdma,
  			 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
  				HOST1X_UCLASS_LOAD_SYNCPT_BASE, 1),
  			 HOST1X_UCLASS_LOAD_SYNCPT_BASE_BASE_INDX_F(id) |
  			 HOST1X_UCLASS_LOAD_SYNCPT_BASE_VALUE_F(value));
  }
  
  static int channel_submit(struct host1x_job *job)
  {
  	struct host1x_channel *ch = job->channel;
  	struct host1x_syncpt *sp;
  	u32 user_syncpt_incrs = job->syncpt_incrs;
  	u32 prev_max = 0;
  	u32 syncval;
  	int err;
  	struct host1x_waitlist *completed_waiter = NULL;
  	struct host1x *host = dev_get_drvdata(ch->dev->parent);
  
  	sp = host->syncpt + job->syncpt_id;
  	trace_host1x_channel_submit(dev_name(ch->dev),
  				    job->num_gathers, job->num_relocs,
  				    job->syncpt_id, job->syncpt_incrs);
  
  	/* before error checks, return current max */
  	prev_max = job->syncpt_end = host1x_syncpt_read_max(sp);
  
  	/* get submit lock */
  	err = mutex_lock_interruptible(&ch->submitlock);
  	if (err)
  		goto error;
  
  	completed_waiter = kzalloc(sizeof(*completed_waiter), GFP_KERNEL);
  	if (!completed_waiter) {
  		mutex_unlock(&ch->submitlock);
  		err = -ENOMEM;
  		goto error;
  	}
  
  	/* begin a CDMA submit */
  	err = host1x_cdma_begin(&ch->cdma, job);
  	if (err) {
  		mutex_unlock(&ch->submitlock);
  		goto error;
  	}
  
  	if (job->serialize) {
  		/*
  		 * Force serialization by inserting a host wait for the
  		 * previous job to finish before this one can commence.
  		 */
  		host1x_cdma_push(&ch->cdma,
  				 host1x_opcode_setclass(HOST1X_CLASS_HOST1X,
  					host1x_uclass_wait_syncpt_r(), 1),
  				 host1x_class_host_wait_syncpt(job->syncpt_id,
  					host1x_syncpt_read_max(sp)));
  	}
  
  	/* Synchronize base register to allow using it for relative waiting */
  	if (sp->base)
  		synchronize_syncpt_base(job);
  
  	syncval = host1x_syncpt_incr_max(sp, user_syncpt_incrs);
  
  	host1x_hw_syncpt_assign_to_channel(host, sp, ch);
  
  	job->syncpt_end = syncval;
  
  	/* add a setclass for modules that require it */
  	if (job->class)
  		host1x_cdma_push(&ch->cdma,
  				 host1x_opcode_setclass(job->class, 0, 0),
  				 HOST1X_OPCODE_NOP);
  
  	submit_gathers(job);
  
  	/* end CDMA submit & stash pinned hMems into sync queue */
  	host1x_cdma_end(&ch->cdma, job);
  
  	trace_host1x_channel_submitted(dev_name(ch->dev), prev_max, syncval);
  
  	/* schedule a submit complete interrupt */
  	err = host1x_intr_add_action(host, sp, syncval,
  				     HOST1X_INTR_ACTION_SUBMIT_COMPLETE, ch,
  				     completed_waiter, NULL);
  	completed_waiter = NULL;
  	WARN(err, "Failed to set submit complete interrupt");
  
  	mutex_unlock(&ch->submitlock);
  
  	return 0;
  
  error:
  	kfree(completed_waiter);
  	return err;
  }
  
  static void enable_gather_filter(struct host1x *host,
  				 struct host1x_channel *ch)
  {
  #if HOST1X_HW >= 6
  	u32 val;
  
  	if (!host->hv_regs)
  		return;
  
  	val = host1x_hypervisor_readl(
  		host, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
  	val |= BIT(ch->id % 32);
  	host1x_hypervisor_writel(
  		host, val, HOST1X_HV_CH_KERNEL_FILTER_GBUFFER(ch->id / 32));
  #elif HOST1X_HW >= 4
  	host1x_ch_writel(ch,
  			 HOST1X_CHANNEL_CHANNELCTRL_KERNEL_FILTER_GBUFFER(1),
  			 HOST1X_CHANNEL_CHANNELCTRL);
  #endif
  }
  
  static int host1x_channel_init(struct host1x_channel *ch, struct host1x *dev,
  			       unsigned int index)
  {
  	ch->regs = dev->regs + index * HOST1X_CHANNEL_SIZE;
  	enable_gather_filter(dev, ch);
  	return 0;
  }
  
  static const struct host1x_channel_ops host1x_channel_ops = {
  	.init = host1x_channel_init,
  	.submit = channel_submit,
  };
  