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/**************************************************************************

 *

 * Copyright © 2009-2014 VMware, Inc., Palo Alto, CA., USA

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

 * USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

#include 

#include "vmwgfx_drv.h"

#include 

#include "device_include/svga_overlay.h"

#include "device_include/svga_escape.h"

#define VMW_MAX_NUM_STREAMS 1

#define VMW_OVERLAY_CAP_MASK (SVGA_FIFO_CAP_VIDEO | SVGA_FIFO_CAP_ESCAPE)

struct vmw_stream {

	struct vmw_dma_buffer *buf;

	bool claimed;

	bool paused;

	struct drm_vmw_control_stream_arg saved;

};

/**

 * Overlay control

 */

struct vmw_overlay {

	/*

	 * Each stream is a single overlay. In Xv these are called ports.

	 */

	struct mutex mutex;

	struct vmw_stream stream[VMW_MAX_NUM_STREAMS];

};

static inline struct vmw_overlay *vmw_overlay(struct drm_device *dev)

{

	struct vmw_private *dev_priv = vmw_priv(dev);

	return dev_priv ? dev_priv->overlay_priv : NULL;

}

struct vmw_escape_header {

	uint32_t cmd;

	SVGAFifoCmdEscape body;

};

struct vmw_escape_video_flush {

	struct vmw_escape_header escape;

	SVGAEscapeVideoFlush flush;

};

static inline void fill_escape(struct vmw_escape_header *header,

			       uint32_t size)

{

	header->cmd = SVGA_CMD_ESCAPE;

	header->body.nsid = SVGA_ESCAPE_NSID_VMWARE;

	header->body.size = size;

}

static inline void fill_flush(struct vmw_escape_video_flush *cmd,

			      uint32_t stream_id)

{

	fill_escape(&cmd->escape, sizeof(cmd->flush));

	cmd->flush.cmdType = SVGA_ESCAPE_VMWARE_VIDEO_FLUSH;

	cmd->flush.streamId = stream_id;

}

/**

 * Send put command to hw.

 *

 * Returns

 * -ERESTARTSYS if interrupted by a signal.

 */

static int vmw_overlay_send_put(struct vmw_private *dev_priv,

				struct vmw_dma_buffer *buf,

				struct drm_vmw_control_stream_arg *arg,

				bool interruptible)

{

	struct vmw_escape_video_flush *flush;

	size_t fifo_size;

	bool have_so = (dev_priv->active_display_unit == vmw_du_screen_object);

	int i, num_items;

	SVGAGuestPtr ptr;

	struct {

		struct vmw_escape_header escape;

		struct {

			uint32_t cmdType;

			uint32_t streamId;

		} header;

	} *cmds;

	struct {

		uint32_t registerId;

		uint32_t value;

	} *items;

	/* defines are a index needs + 1 */

	if (have_so)

		num_items = SVGA_VIDEO_DST_SCREEN_ID + 1;

	else

		num_items = SVGA_VIDEO_PITCH_3 + 1;

	fifo_size = sizeof(*cmds) + sizeof(*flush) + sizeof(*items) * num_items;

	cmds = vmw_fifo_reserve(dev_priv, fifo_size);

	/* hardware has hung, can't do anything here */

	if (!cmds)

		return -ENOMEM;

	items = (typeof(items))&cmds[1];

	flush = (struct vmw_escape_video_flush *)&items[num_items];

	/* the size is header + number of items */

	fill_escape(&cmds->escape, sizeof(*items) * (num_items + 1));

	cmds->header.cmdType = SVGA_ESCAPE_VMWARE_VIDEO_SET_REGS;

	cmds->header.streamId = arg->stream_id;

	/* the IDs are neatly numbered */

	for (i = 0; i < num_items; i++)

		items[i].registerId = i;

	vmw_bo_get_guest_ptr(&buf->base, &ptr);

	ptr.offset += arg->offset;

	items[SVGA_VIDEO_ENABLED].value     = true;

	items[SVGA_VIDEO_FLAGS].value       = arg->flags;

	items[SVGA_VIDEO_DATA_OFFSET].value = ptr.offset;

	items[SVGA_VIDEO_FORMAT].value      = arg->format;

	items[SVGA_VIDEO_COLORKEY].value    = arg->color_key;

	items[SVGA_VIDEO_SIZE].value        = arg->size;

	items[SVGA_VIDEO_WIDTH].value       = arg->width;

	items[SVGA_VIDEO_HEIGHT].value      = arg->height;

	items[SVGA_VIDEO_SRC_X].value       = arg->src.x;

	items[SVGA_VIDEO_SRC_Y].value       = arg->src.y;

	items[SVGA_VIDEO_SRC_WIDTH].value   = arg->src.w;

	items[SVGA_VIDEO_SRC_HEIGHT].value  = arg->src.h;

	items[SVGA_VIDEO_DST_X].value       = arg->dst.x;

	items[SVGA_VIDEO_DST_Y].value       = arg->dst.y;

	items[SVGA_VIDEO_DST_WIDTH].value   = arg->dst.w;

	items[SVGA_VIDEO_DST_HEIGHT].value  = arg->dst.h;

	items[SVGA_VIDEO_PITCH_1].value     = arg->pitch[0];

	items[SVGA_VIDEO_PITCH_2].value     = arg->pitch[1];

	items[SVGA_VIDEO_PITCH_3].value     = arg->pitch[2];

	if (have_so) {

		items[SVGA_VIDEO_DATA_GMRID].value    = ptr.gmrId;

		items[SVGA_VIDEO_DST_SCREEN_ID].value = SVGA_ID_INVALID;

	}

	fill_flush(flush, arg->stream_id);

	vmw_fifo_commit(dev_priv, fifo_size);

	return 0;

}

/**

 * Send stop command to hw.

 *

 * Returns

 * -ERESTARTSYS if interrupted by a signal.

 */

static int vmw_overlay_send_stop(struct vmw_private *dev_priv,

				 uint32_t stream_id,

				 bool interruptible)

{

	struct {

		struct vmw_escape_header escape;

		SVGAEscapeVideoSetRegs body;

		struct vmw_escape_video_flush flush;

	} *cmds;

	int ret;

	for (;;) {

		cmds = vmw_fifo_reserve(dev_priv, sizeof(*cmds));

		if (cmds)

			break;

		ret = vmw_fallback_wait(dev_priv, false, true, 0,

					interruptible, 3*HZ);

		if (interruptible && ret == -ERESTARTSYS)

			return ret;

		else

			BUG_ON(ret != 0);

	}

	fill_escape(&cmds->escape, sizeof(cmds->body));

	cmds->body.header.cmdType = SVGA_ESCAPE_VMWARE_VIDEO_SET_REGS;

	cmds->body.header.streamId = stream_id;

	cmds->body.items[0].registerId = SVGA_VIDEO_ENABLED;

	cmds->body.items[0].value = false;

	fill_flush(&cmds->flush, stream_id);

	vmw_fifo_commit(dev_priv, sizeof(*cmds));

	return 0;

}

/**

 * Move a buffer to vram or gmr if @pin is set, else unpin the buffer.

 *

 * With the introduction of screen objects buffers could now be

 * used with GMRs instead of being locked to vram.

 */

static int vmw_overlay_move_buffer(struct vmw_private *dev_priv,

				   struct vmw_dma_buffer *buf,

				   bool pin, bool inter)

{

	if (!pin)

		return vmw_dmabuf_unpin(dev_priv, buf, inter);

	if (dev_priv->active_display_unit == vmw_du_legacy)

		return vmw_dmabuf_pin_in_vram(dev_priv, buf, inter);

	return vmw_dmabuf_pin_in_vram_or_gmr(dev_priv, buf, inter);

}

/**

 * Stop or pause a stream.

 *

 * If the stream is paused the no evict flag is removed from the buffer

 * but left in vram. This allows for instance mode_set to evict it

 * should it need to.

 *

 * The caller must hold the overlay lock.

 *

 * @stream_id which stream to stop/pause.

 * @pause true to pause, false to stop completely.

 */

static int vmw_overlay_stop(struct vmw_private *dev_priv,

			    uint32_t stream_id, bool pause,

			    bool interruptible)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	struct vmw_stream *stream = &overlay->stream[stream_id];

	int ret;

	/* no buffer attached the stream is completely stopped */

	if (!stream->buf)

		return 0;

	/* If the stream is paused this is already done */

	if (!stream->paused) {

		ret = vmw_overlay_send_stop(dev_priv, stream_id,

					    interruptible);

		if (ret)

			return ret;

		/* We just remove the NO_EVICT flag so no -ENOMEM */

		ret = vmw_overlay_move_buffer(dev_priv, stream->buf, false,

					      interruptible);

		if (interruptible && ret == -ERESTARTSYS)

			return ret;

		else

			BUG_ON(ret != 0);

	}

	if (!pause) {

		vmw_dmabuf_unreference(&stream->buf);

		stream->paused = false;

	} else {

		stream->paused = true;

	}

	return 0;

}

/**

 * Update a stream and send any put or stop fifo commands needed.

 *

 * The caller must hold the overlay lock.

 *

 * Returns

 * -ENOMEM if buffer doesn't fit in vram.

 * -ERESTARTSYS if interrupted.

 */

static int vmw_overlay_update_stream(struct vmw_private *dev_priv,

				     struct vmw_dma_buffer *buf,

				     struct drm_vmw_control_stream_arg *arg,

				     bool interruptible)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	struct vmw_stream *stream = &overlay->stream[arg->stream_id];

	int ret = 0;

	if (!buf)

		return -EINVAL;

	DRM_DEBUG("   %s: old %p, new %p, %spaused\n", __func__,

		  stream->buf, buf, stream->paused ? "" : "not ");

	if (stream->buf != buf) {

		ret = vmw_overlay_stop(dev_priv, arg->stream_id,

				       false, interruptible);

		if (ret)

			return ret;

	} else if (!stream->paused) {

		/* If the buffers match and not paused then just send

		 * the put command, no need to do anything else.

		 */

		ret = vmw_overlay_send_put(dev_priv, buf, arg, interruptible);

		if (ret == 0)

			stream->saved = *arg;

		else

			BUG_ON(!interruptible);

		return ret;

	}

	/* We don't start the old stream if we are interrupted.

	 * Might return -ENOMEM if it can't fit the buffer in vram.

	 */

	ret = vmw_overlay_move_buffer(dev_priv, buf, true, interruptible);

	if (ret)

		return ret;

	ret = vmw_overlay_send_put(dev_priv, buf, arg, interruptible);

	if (ret) {

		/* This one needs to happen no matter what. We only remove

		 * the NO_EVICT flag so this is safe from -ENOMEM.

		 */

		BUG_ON(vmw_overlay_move_buffer(dev_priv, buf, false, false)

		       != 0);

		return ret;

	}

	if (stream->buf != buf)

		stream->buf = vmw_dmabuf_reference(buf);

	stream->saved = *arg;

	/* stream is no longer stopped/paused */

	stream->paused = false;

	return 0;

}

/**

 * Stop all streams.

 *

 * Used by the fb code when starting.

 *

 * Takes the overlay lock.

 */

int vmw_overlay_stop_all(struct vmw_private *dev_priv)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	int i, ret;

	if (!overlay)

		return 0;

	mutex_lock(&overlay->mutex);

	for (i = 0; i < VMW_MAX_NUM_STREAMS; i++) {

		struct vmw_stream *stream = &overlay->stream[i];

		if (!stream->buf)

			continue;

		ret = vmw_overlay_stop(dev_priv, i, false, false);

		WARN_ON(ret != 0);

	}

	mutex_unlock(&overlay->mutex);

	return 0;

}

/**

 * Try to resume all paused streams.

 *

 * Used by the kms code after moving a new scanout buffer to vram.

 *

 * Takes the overlay lock.

 */

int vmw_overlay_resume_all(struct vmw_private *dev_priv)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	int i, ret;

	if (!overlay)

		return 0;

	mutex_lock(&overlay->mutex);

	for (i = 0; i < VMW_MAX_NUM_STREAMS; i++) {

		struct vmw_stream *stream = &overlay->stream[i];

		if (!stream->paused)

			continue;

		ret = vmw_overlay_update_stream(dev_priv, stream->buf,

						&stream->saved, false);

		if (ret != 0)

			DRM_INFO("%s: *warning* failed to resume stream %i\n",

				 __func__, i);

	}

	mutex_unlock(&overlay->mutex);

	return 0;

}

/**

 * Pauses all active streams.

 *

 * Used by the kms code when moving a new scanout buffer to vram.

 *

 * Takes the overlay lock.

 */

int vmw_overlay_pause_all(struct vmw_private *dev_priv)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	int i, ret;

	if (!overlay)

		return 0;

	mutex_lock(&overlay->mutex);

	for (i = 0; i < VMW_MAX_NUM_STREAMS; i++) {

		if (overlay->stream[i].paused)

			DRM_INFO("%s: *warning* stream %i already paused\n",

				 __func__, i);

		ret = vmw_overlay_stop(dev_priv, i, true, false);

		WARN_ON(ret != 0);

	}

	mutex_unlock(&overlay->mutex);

	return 0;

}

static bool vmw_overlay_available(const struct vmw_private *dev_priv)

{

	return (dev_priv->overlay_priv != NULL &&

		((dev_priv->fifo.capabilities & VMW_OVERLAY_CAP_MASK) ==

		 VMW_OVERLAY_CAP_MASK));

}

int vmw_overlay_ioctl(struct drm_device *dev, void *data,

		      struct drm_file *file_priv)

{

	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

	struct vmw_private *dev_priv = vmw_priv(dev);

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	struct drm_vmw_control_stream_arg *arg =

	    (struct drm_vmw_control_stream_arg *)data;

	struct vmw_dma_buffer *buf;

	struct vmw_resource *res;

	int ret;

	if (!vmw_overlay_available(dev_priv))

		return -ENOSYS;

	ret = vmw_user_stream_lookup(dev_priv, tfile, &arg->stream_id, &res);

	if (ret)

		return ret;

	mutex_lock(&overlay->mutex);

	if (!arg->enabled) {

		ret = vmw_overlay_stop(dev_priv, arg->stream_id, false, true);

		goto out_unlock;

	}

	ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &buf, NULL);

	if (ret)

		goto out_unlock;

	ret = vmw_overlay_update_stream(dev_priv, buf, arg, true);

	vmw_dmabuf_unreference(&buf);

out_unlock:

	mutex_unlock(&overlay->mutex);

	vmw_resource_unreference(&res);

	return ret;

}

int vmw_overlay_num_overlays(struct vmw_private *dev_priv)

{

	if (!vmw_overlay_available(dev_priv))

		return 0;

	return VMW_MAX_NUM_STREAMS;

}

int vmw_overlay_num_free_overlays(struct vmw_private *dev_priv)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	int i, k;

	if (!vmw_overlay_available(dev_priv))

		return 0;

	mutex_lock(&overlay->mutex);

	for (i = 0, k = 0; i < VMW_MAX_NUM_STREAMS; i++)

		if (!overlay->stream[i].claimed)

			k++;

	mutex_unlock(&overlay->mutex);

	return k;

}

int vmw_overlay_claim(struct vmw_private *dev_priv, uint32_t *out)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	int i;

	if (!overlay)

		return -ENOSYS;

	mutex_lock(&overlay->mutex);

	for (i = 0; i < VMW_MAX_NUM_STREAMS; i++) {

		if (overlay->stream[i].claimed)

			continue;

		overlay->stream[i].claimed = true;

		*out = i;

		mutex_unlock(&overlay->mutex);

		return 0;

	}

	mutex_unlock(&overlay->mutex);

	return -ESRCH;

}

int vmw_overlay_unref(struct vmw_private *dev_priv, uint32_t stream_id)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	BUG_ON(stream_id >= VMW_MAX_NUM_STREAMS);

	if (!overlay)

		return -ENOSYS;

	mutex_lock(&overlay->mutex);

	WARN_ON(!overlay->stream[stream_id].claimed);

	vmw_overlay_stop(dev_priv, stream_id, false, false);

	overlay->stream[stream_id].claimed = false;

	mutex_unlock(&overlay->mutex);

	return 0;

}

int vmw_overlay_init(struct vmw_private *dev_priv)

{

	struct vmw_overlay *overlay;

	int i;

	if (dev_priv->overlay_priv)

		return -EINVAL;

	overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);

	if (!overlay)

		return -ENOMEM;

	mutex_init(&overlay->mutex);

	for (i = 0; i < VMW_MAX_NUM_STREAMS; i++) {

		overlay->stream[i].buf = NULL;

		overlay->stream[i].paused = false;

		overlay->stream[i].claimed = false;

	}

	dev_priv->overlay_priv = overlay;

	return 0;

}

int vmw_overlay_close(struct vmw_private *dev_priv)

{

	struct vmw_overlay *overlay = dev_priv->overlay_priv;

	bool forgotten_buffer = false;

	int i;

	if (!overlay)

		return -ENOSYS;

	for (i = 0; i < VMW_MAX_NUM_STREAMS; i++) {

		if (overlay->stream[i].buf) {

			forgotten_buffer = true;

			vmw_overlay_stop(dev_priv, i, false, false);

		}

	}

	WARN_ON(forgotten_buffer);

	dev_priv->overlay_priv = NULL;

	kfree(overlay);

	return 0;

}