video: tegra: host: refactor for upstreaming

- split the nvhost clients into their own directories
- each client is a nvhost_device and nvhost_driver
- all the code related to host1x control node is centralized
at single place in dev.c
- all the code related to host1x modules nodes is centralized
at single place in bus_client.c
- update the copyright notice & year for new files

Bug 871237

Change-Id: Ief85064699e35ad02b48a7e54496928d7f085af4
Signed-off-by: Mayuresh Kulkarni <mkulkarni@nvidia.com>
Reviewed-on: http://git-master/r/83491
Reviewed-by: Rohan Somvanshi <rsomvanshi@nvidia.com>
Tested-by: Rohan Somvanshi <rsomvanshi@nvidia.com>

1 files changed, 556 insertions, 1 deletions

diff --git a/drivers/video/tegra/host/bus_client.c b/drivers/video/tegra/host/bus_client.c
index 213fae59a4f0..b9164dc1b02b 100644
--- a/drivers/video/tegra/host/bus_client.c
+++ b/drivers/video/tegra/host/bus_client.c
@@ -18,9 +18,32 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/uaccess.h>
+#include <linux/file.h>
+#include <linux/clk.h>
+#include <linux/hrtimer.h>
+
+#include <trace/events/nvhost.h>
+
+#include <linux/io.h>
+#include <linux/string.h>
+
+#include <linux/nvhost.h>
+#include <linux/nvhost_ioctl.h>
+
+#include <mach/nvmap.h>
+#include <mach/gpufuse.h>
+#include <mach/hardware.h>
+#include <mach/iomap.h>
+
+#include "debug.h"
 #include "bus_client.h"
 #include "dev.h"
-#include <linux/string.h>
 
 void nvhost_read_module_regs(struct nvhost_device *ndev,
 			u32 offset, int count, u32 *values)
@@ -49,3 +72,535 @@ void nvhost_write_module_regs(struct nvhost_device *ndev,
 	wmb();
 	nvhost_module_idle(ndev);
 }
+
+struct nvhost_channel_userctx {
+	struct nvhost_channel *ch;
+	struct nvhost_hwctx *hwctx;
+	struct nvhost_submit_hdr_ext hdr;
+	int num_relocshifts;
+	struct nvhost_job *job;
+	struct nvmap_client *nvmap;
+	u32 timeout;
+	u32 priority;
+	int clientid;
+};
+
+/*
+ * Write cmdbuf to ftrace output. Checks if cmdbuf contents should be output
+ * and mmaps the cmdbuf contents if required.
+ */
+static void trace_write_cmdbufs(struct nvhost_job *job)
+{
+	struct nvmap_handle_ref handle;
+	void *mem = NULL;
+	int i = 0;
+
+	for (i = 0; i < job->num_gathers; i++) {
+		struct nvhost_channel_gather *gather = &job->gathers[i];
+		if (nvhost_debug_trace_cmdbuf) {
+			handle.handle = nvmap_id_to_handle(gather->mem_id);
+			mem = nvmap_mmap(&handle);
+			if (IS_ERR_OR_NULL(mem))
+				mem = NULL;
+		};
+
+		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 < gather->words; i += TRACE_MAX_LENGTH) {
+				trace_nvhost_channel_write_cmdbuf_data(
+					job->ch->dev->name,
+					gather->mem_id,
+					min(gather->words - i,
+					    TRACE_MAX_LENGTH),
+					gather->offset + i * sizeof(u32),
+					mem);
+			}
+			nvmap_munmap(&handle, mem);
+		}
+	}
+}
+
+static int nvhost_channelrelease(struct inode *inode, struct file *filp)
+{
+	struct nvhost_channel_userctx *priv = filp->private_data;
+
+	trace_nvhost_channel_release(priv->ch->dev->name);
+
+	filp->private_data = NULL;
+
+	nvhost_module_remove_client(priv->ch->dev, priv);
+	nvhost_putchannel(priv->ch, priv->hwctx);
+
+	if (priv->hwctx)
+		priv->ch->ctxhandler->put(priv->hwctx);
+
+	if (priv->job)
+		nvhost_job_put(priv->job);
+
+	nvmap_client_put(priv->nvmap);
+	kfree(priv);
+	return 0;
+}
+
+static int nvhost_channelopen(struct inode *inode, struct file *filp)
+{
+	struct nvhost_channel_userctx *priv;
+	struct nvhost_channel *ch;
+
+	ch = container_of(inode->i_cdev, struct nvhost_channel, cdev);
+	ch = nvhost_getchannel(ch);
+	if (!ch)
+		return -ENOMEM;
+	trace_nvhost_channel_open(ch->dev->name);
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		nvhost_putchannel(ch, NULL);
+		return -ENOMEM;
+	}
+	filp->private_data = priv;
+	priv->ch = ch;
+	nvhost_module_add_client(ch->dev, priv);
+
+	if (ch->ctxhandler && ch->ctxhandler->alloc) {
+		priv->hwctx = ch->ctxhandler->alloc(ch->ctxhandler, ch);
+		if (!priv->hwctx)
+			goto fail;
+	}
+	priv->priority = NVHOST_PRIORITY_MEDIUM;
+	priv->clientid = atomic_add_return(1,
+			&nvhost_get_host(ch->dev)->clientid);
+
+	priv->job = nvhost_job_alloc(ch, priv->hwctx, &priv->hdr,
+			NULL, priv->priority, priv->clientid);
+	if (!priv->job)
+		goto fail;
+
+	return 0;
+fail:
+	nvhost_channelrelease(inode, filp);
+	return -ENOMEM;
+}
+
+static int set_submit(struct nvhost_channel_userctx *ctx)
+{
+	struct device *device = &ctx->ch->dev->dev;
+
+	/* submit should have at least 1 cmdbuf */
+	if (!ctx->hdr.num_cmdbufs)
+		return -EIO;
+
+	if (!ctx->nvmap) {
+		dev_err(device, "no nvmap context set\n");
+		return -EFAULT;
+	}
+
+	ctx->job = nvhost_job_realloc(ctx->job,
+			&ctx->hdr,
+			ctx->nvmap,
+			ctx->priority,
+			ctx->clientid);
+	if (!ctx->job)
+		return -ENOMEM;
+	ctx->job->timeout = ctx->timeout;
+
+	if (ctx->hdr.submit_version >= NVHOST_SUBMIT_VERSION_V2)
+		ctx->num_relocshifts = ctx->hdr.num_relocs;
+
+	return 0;
+}
+
+static void reset_submit(struct nvhost_channel_userctx *ctx)
+{
+	ctx->hdr.num_cmdbufs = 0;
+	ctx->hdr.num_relocs = 0;
+	ctx->num_relocshifts = 0;
+	ctx->hdr.num_waitchks = 0;
+}
+
+static ssize_t nvhost_channelwrite(struct file *filp, const char __user *buf,
+				size_t count, loff_t *offp)
+{
+	struct nvhost_channel_userctx *priv = filp->private_data;
+	size_t remaining = count;
+	int err = 0;
+	struct nvhost_job *job = priv->job;
+	struct nvhost_submit_hdr_ext *hdr = &priv->hdr;
+	const char *chname = priv->ch->dev->name;
+
+	if (!job)
+		return -EIO;
+
+	while (remaining) {
+		size_t consumed;
+		if (!hdr->num_relocs &&
+		    !priv->num_relocshifts &&
+		    !hdr->num_cmdbufs &&
+		    !hdr->num_waitchks) {
+			consumed = sizeof(struct nvhost_submit_hdr);
+			if (remaining < consumed)
+				break;
+			if (copy_from_user(hdr, buf, consumed)) {
+				err = -EFAULT;
+				break;
+			}
+			hdr->submit_version = NVHOST_SUBMIT_VERSION_V0;
+			err = set_submit(priv);
+			if (err)
+				break;
+			trace_nvhost_channel_write_submit(chname,
+			  count, hdr->num_cmdbufs, hdr->num_relocs,
+			  hdr->syncpt_id, hdr->syncpt_incrs);
+		} else if (hdr->num_cmdbufs) {
+			struct nvhost_cmdbuf cmdbuf;
+			consumed = sizeof(cmdbuf);
+			if (remaining < consumed)
+				break;
+			if (copy_from_user(&cmdbuf, buf, consumed)) {
+				err = -EFAULT;
+				break;
+			}
+			trace_nvhost_channel_write_cmdbuf(chname,
+				cmdbuf.mem, cmdbuf.words, cmdbuf.offset);
+			nvhost_job_add_gather(job,
+				cmdbuf.mem, cmdbuf.words, cmdbuf.offset);
+			hdr->num_cmdbufs--;
+		} else if (hdr->num_relocs) {
+			consumed = sizeof(struct nvhost_reloc);
+			if (remaining < consumed)
+				break;
+			if (copy_from_user(&job->pinarray[job->num_pins],
+					buf, consumed)) {
+				err = -EFAULT;
+				break;
+			}
+			trace_nvhost_channel_write_reloc(chname);
+			job->num_pins++;
+			hdr->num_relocs--;
+		} else if (hdr->num_waitchks) {
+			int numwaitchks =
+				(remaining / sizeof(struct nvhost_waitchk));
+			if (!numwaitchks)
+				break;
+			numwaitchks = min_t(int,
+				numwaitchks, hdr->num_waitchks);
+			consumed = numwaitchks * sizeof(struct nvhost_waitchk);
+			if (copy_from_user(&job->waitchk[job->num_waitchk],
+					buf, consumed)) {
+				err = -EFAULT;
+				break;
+			}
+			trace_nvhost_channel_write_waitchks(
+			  chname, numwaitchks,
+			  hdr->waitchk_mask);
+			job->num_waitchk += numwaitchks;
+			hdr->num_waitchks -= numwaitchks;
+		} else if (priv->num_relocshifts) {
+			int next_shift =
+				job->num_pins - priv->num_relocshifts;
+			consumed = sizeof(struct nvhost_reloc_shift);
+			if (remaining < consumed)
+				break;
+			if (copy_from_user(
+					&job->pinarray[next_shift].reloc_shift,
+					buf, consumed)) {
+				err = -EFAULT;
+				break;
+			}
+			priv->num_relocshifts--;
+		} else {
+			err = -EFAULT;
+			break;
+		}
+		remaining -= consumed;
+		buf += consumed;
+	}
+
+	if (err < 0) {
+		dev_err(&priv->ch->dev->dev, "channel write error\n");
+		reset_submit(priv);
+		return err;
+	}
+
+	return count - remaining;
+}
+
+static int nvhost_ioctl_channel_flush(
+	struct nvhost_channel_userctx *ctx,
+	struct nvhost_get_param_args *args,
+	int null_kickoff)
+{
+	struct device *device = &ctx->ch->dev->dev;
+	int err;
+
+	trace_nvhost_ioctl_channel_flush(ctx->ch->dev->name);
+
+	if (!ctx->job ||
+	    ctx->hdr.num_relocs ||
+	    ctx->hdr.num_cmdbufs ||
+	    ctx->hdr.num_waitchks) {
+		reset_submit(ctx);
+		dev_err(device, "channel submit out of sync\n");
+		return -EFAULT;
+	}
+
+	err = nvhost_job_pin(ctx->job);
+	if (err) {
+		dev_warn(device, "nvhost_job_pin failed: %d\n", err);
+		return err;
+	}
+
+	if (nvhost_debug_null_kickoff_pid == current->tgid)
+		null_kickoff = 1;
+	ctx->job->null_kickoff = null_kickoff;
+
+	if ((nvhost_debug_force_timeout_pid == current->tgid) &&
+	    (nvhost_debug_force_timeout_channel == ctx->ch->chid)) {
+		ctx->timeout = nvhost_debug_force_timeout_val;
+	}
+
+	trace_write_cmdbufs(ctx->job);
+
+	/* context switch if needed, and submit user's gathers to the channel */
+	err = nvhost_channel_submit(ctx->job);
+	args->value = ctx->job->syncpt_end;
+	if (err)
+		nvhost_job_unpin(ctx->job);
+
+	return err;
+}
+
+static int nvhost_ioctl_channel_read_3d_reg(
+	struct nvhost_channel_userctx *ctx,
+	struct nvhost_read_3d_reg_args *args)
+{
+	BUG_ON(!channel_op(ctx->ch).read3dreg);
+	return channel_op(ctx->ch).read3dreg(ctx->ch, ctx->hwctx,
+			args->offset, &args->value);
+}
+
+static long nvhost_channelctl(struct file *filp,
+	unsigned int cmd, unsigned long arg)
+{
+	struct nvhost_channel_userctx *priv = filp->private_data;
+	u8 buf[NVHOST_IOCTL_CHANNEL_MAX_ARG_SIZE];
+	int err = 0;
+
+	if ((_IOC_TYPE(cmd) != NVHOST_IOCTL_MAGIC) ||
+		(_IOC_NR(cmd) == 0) ||
+		(_IOC_NR(cmd) > NVHOST_IOCTL_CHANNEL_LAST))
+		return -EFAULT;
+
+	BUG_ON(_IOC_SIZE(cmd) > NVHOST_IOCTL_CHANNEL_MAX_ARG_SIZE);
+
+	if (_IOC_DIR(cmd) & _IOC_WRITE) {
+		if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
+			return -EFAULT;
+	}
+
+	switch (cmd) {
+	case NVHOST_IOCTL_CHANNEL_FLUSH:
+		err = nvhost_ioctl_channel_flush(priv, (void *)buf, 0);
+		break;
+	case NVHOST_IOCTL_CHANNEL_NULL_KICKOFF:
+		err = nvhost_ioctl_channel_flush(priv, (void *)buf, 1);
+		break;
+	case NVHOST_IOCTL_CHANNEL_SUBMIT_EXT:
+	{
+		struct nvhost_submit_hdr_ext *hdr;
+
+		if (priv->hdr.num_relocs ||
+		    priv->num_relocshifts ||
+		    priv->hdr.num_cmdbufs ||
+		    priv->hdr.num_waitchks) {
+			reset_submit(priv);
+			dev_err(&priv->ch->dev->dev,
+				"channel submit out of sync\n");
+			err = -EIO;
+			break;
+		}
+
+		hdr = (struct nvhost_submit_hdr_ext *)buf;
+		if (hdr->submit_version > NVHOST_SUBMIT_VERSION_MAX_SUPPORTED) {
+			dev_err(&priv->ch->dev->dev,
+				"submit version %d > max supported %d\n",
+				hdr->submit_version,
+				NVHOST_SUBMIT_VERSION_MAX_SUPPORTED);
+			err = -EINVAL;
+			break;
+		}
+		memcpy(&priv->hdr, hdr, sizeof(struct nvhost_submit_hdr_ext));
+		err = set_submit(priv);
+		trace_nvhost_ioctl_channel_submit(priv->ch->dev->name,
+			priv->hdr.submit_version,
+			priv->hdr.num_cmdbufs, priv->hdr.num_relocs,
+			priv->hdr.num_waitchks,
+			priv->hdr.syncpt_id, priv->hdr.syncpt_incrs);
+		break;
+	}
+	case NVHOST_IOCTL_CHANNEL_GET_SYNCPOINTS:
+		/* host syncpt ID is used by the RM (and never be given out) */
+		BUG_ON(priv->ch->dev->syncpts & (1 << NVSYNCPT_GRAPHICS_HOST));
+		((struct nvhost_get_param_args *)buf)->value =
+			priv->ch->dev->syncpts;
+		break;
+	case NVHOST_IOCTL_CHANNEL_GET_WAITBASES:
+		((struct nvhost_get_param_args *)buf)->value =
+			priv->ch->dev->waitbases;
+		break;
+	case NVHOST_IOCTL_CHANNEL_GET_MODMUTEXES:
+		((struct nvhost_get_param_args *)buf)->value =
+			priv->ch->dev->modulemutexes;
+		break;
+	case NVHOST_IOCTL_CHANNEL_SET_NVMAP_FD:
+	{
+		int fd = (int)((struct nvhost_set_nvmap_fd_args *)buf)->fd;
+		struct nvmap_client *new_client = nvmap_client_get_file(fd);
+
+		if (IS_ERR(new_client)) {
+			err = PTR_ERR(new_client);
+			break;
+		}
+
+		if (priv->nvmap)
+			nvmap_client_put(priv->nvmap);
+
+		priv->nvmap = new_client;
+		break;
+	}
+	case NVHOST_IOCTL_CHANNEL_READ_3D_REG:
+		err = nvhost_ioctl_channel_read_3d_reg(priv, (void *)buf);
+		break;
+	case NVHOST_IOCTL_CHANNEL_GET_CLK_RATE:
+	{
+		unsigned long rate;
+		struct nvhost_clk_rate_args *arg =
+				(struct nvhost_clk_rate_args *)buf;
+
+		err = nvhost_module_get_rate(priv->ch->dev, &rate, 0);
+		if (err == 0)
+			arg->rate = rate;
+		break;
+	}
+	case NVHOST_IOCTL_CHANNEL_SET_CLK_RATE:
+	{
+		struct nvhost_clk_rate_args *arg =
+				(struct nvhost_clk_rate_args *)buf;
+		unsigned long rate = (unsigned long)arg->rate;
+
+		err = nvhost_module_set_rate(priv->ch->dev, priv, rate, 0);
+		break;
+	}
+	case NVHOST_IOCTL_CHANNEL_SET_TIMEOUT:
+		priv->timeout =
+			(u32)((struct nvhost_set_timeout_args *)buf)->timeout;
+		dev_dbg(&priv->ch->dev->dev,
+			"%s: setting buffer timeout (%d ms) for userctx 0x%p\n",
+			__func__, priv->timeout, priv);
+		break;
+	case NVHOST_IOCTL_CHANNEL_GET_TIMEDOUT:
+		((struct nvhost_get_param_args *)buf)->value =
+				priv->hwctx->has_timedout;
+		break;
+	case NVHOST_IOCTL_CHANNEL_SET_PRIORITY:
+		priv->priority =
+			(u32)((struct nvhost_set_priority_args *)buf)->priority;
+		break;
+	default:
+		err = -ENOTTY;
+		break;
+	}
+
+	if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))
+		err = copy_to_user((void __user *)arg, buf, _IOC_SIZE(cmd));
+
+	return err;
+}
+
+static const struct file_operations nvhost_channelops = {
+	.owner = THIS_MODULE,
+	.release = nvhost_channelrelease,
+	.open = nvhost_channelopen,
+	.write = nvhost_channelwrite,
+	.unlocked_ioctl = nvhost_channelctl
+};
+
+int nvhost_client_user_init(struct nvhost_device *dev)
+{
+	int err, devno;
+
+	struct nvhost_channel *ch = dev->channel;
+
+	cdev_init(&ch->cdev, &nvhost_channelops);
+	ch->cdev.owner = THIS_MODULE;
+
+	devno = MKDEV(nvhost_major, nvhost_minor + dev->index);
+	err = cdev_add(&ch->cdev, devno, 1);
+	if (err < 0) {
+		dev_err(&dev->dev,
+			"failed to add chan %i cdev\n", dev->index);
+		goto fail;
+	}
+	ch->node = device_create(nvhost_get_host(dev)->nvhost_class, NULL, devno, NULL,
+			IFACE_NAME "-%s", dev->name);
+	if (IS_ERR(ch->node)) {
+		err = PTR_ERR(ch->node);
+		dev_err(&dev->dev,
+			"failed to create %s channel device\n", dev->name);
+		goto fail;
+	}
+
+	return 0;
+fail:
+	return err;
+}
+
+int nvhost_client_device_init(struct nvhost_device *dev)
+{
+	int err;
+	struct nvhost_master *nvhost_master = nvhost_get_host(dev);
+	struct nvhost_channel *ch = &nvhost_master->channels[dev->index];
+
+	/* store the pointer to this device for channel */
+	ch->dev = dev;
+
+	err = nvhost_channel_init(ch, nvhost_master, dev->index);
+	if (err)
+		goto fail;
+
+	err = nvhost_client_user_init(dev);
+	if (err)
+		goto fail;
+
+	err = nvhost_module_init(dev);
+	if (err)
+		goto fail;
+
+	dev_info(&dev->dev, "initialized\n");
+
+	return 0;
+
+fail:
+	/* Add clean-up */
+	return err;
+}
+
+int nvhost_client_device_suspend(struct nvhost_device *dev)
+{
+	int ret = 0;
+
+	dev_info(&dev->dev, "suspending\n");
+
+	ret = nvhost_channel_suspend(dev->channel);
+	if (ret)
+		return ret;
+
+	ret = nvhost_module_suspend(dev, true);
+	dev_info(&dev->dev, "suspend status: %d\n", ret);
+
+	return ret;
+}