<
" System gvimrc file for Mac OS X
" Author:	Benji Fisher <benji@member.AMS.org>
" Last Change: Thu Mar 09 09:00 AM 2006 EST
"
" Define Mac-standard keyboard shortcuts.

" We don't change 'cpoptions' here, because it would not be set properly when
" a .vimrc file is found later.  Thus don't use line continuation and use
" <special> in mappings.

nnoremap <special> <D-n> :confirm enew<CR>
vmap <special> <D-n> <Esc><D-n>gv
imap <special> <D-n> <C-O><D-pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
/*
 * Copyright 2016 Intel Corporation
 *
 * 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
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * them 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 MERCHANTIBILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS 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 <linux/dma-buf.h>
#include <linux/reservation.h>

#include "vgem_drv.h"

#define VGEM_FENCE_TIMEOUT (10*HZ)

struct vgem_fence {
	struct dma_fence base;
	struct spinlock lock;
	struct timer_list timer;
};

static const char *vgem_fence_get_driver_name(struct dma_fence *fence)
{
	return "vgem";
}

static const char *vgem_fence_get_timeline_name(struct dma_fence *fence)
{
	return "unbound";
}

static void vgem_fence_release(struct dma_fence *base)
{
	struct vgem_fence *fence = container_of(base, typeof(*fence), base);

	del_timer_sync(&fence->timer);
	dma_fence_free(&fence->base);
}

static void vgem_fence_value_str(struct dma_fence *fence, char *str, int size)
{
	snprintf(str, size, "%u", fence->seqno);
}

static void vgem_fence_timeline_value_str(struct dma_fence *fence, char *str,
					  int size)
{
	snprintf(str, size, "%u",
		 dma_fence_is_signaled(fence) ? fence->seqno : 0);
}

static const struct dma_fence_ops vgem_fence_ops = {
	.get_driver_name = vgem_fence_get_driver_name,
	.get_timeline_name = vgem_fence_get_timeline_name,
	.release = vgem_fence_release,

	.fence_value_str = vgem_fence_value_str,
	.timeline_value_str = vgem_fence_timeline_value_str,
};

static void vgem_fence_timeout(struct timer_list *t)
{
	struct vgem_fence *fence = from_timer(fence, t, timer);

	dma_fence_signal(&fence->base);
}

static struct dma_fence *vgem_fence_create(struct vgem_file *vfile,
					   unsigned int flags)
{
	struct vgem_fence *fence;

	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
	if (!fence)
		return NULL;

	spin_lock_init(&fence->lock);
	dma_fence_init(&fence->base, &vgem_fence_ops, &fence->lock,
		       dma_fence_context_alloc(1), 1);

	timer_setup(&fence->timer, vgem_fence_timeout, 0);

	/* We force the fence to expire within 10s to prevent driver hangs */
	mod_timer(&fence->timer, jiffies + VGEM_FENCE_TIMEOUT);

	return &fence->base;
}

static int attach_dmabuf(struct drm_device *dev,
			 struct drm_gem_object *obj)
{
	struct dma_buf *dmabuf;

	if (obj->dma_buf)
		return 0;

	dmabuf = dev->driver->gem_prime_export(dev, obj, 0);
	if (IS_ERR(dmabuf))
		return PTR_ERR(dmabuf);

	obj->dma_buf = dmabuf;
	return 0;
}

/*
 * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH):
 *
 * Create and attach a fence to the vGEM handle. This fence is then exposed
 * via the dma-buf reservation object and visible to consumers of the exported
 * dma-buf. If the flags contain VGEM_FENCE_WRITE, the fence indicates the
 * vGEM buffer is being written to by the client and is exposed as an exclusive
 * fence, otherwise the fence indicates the client is current reading from the
 * buffer and all future writes should wait for the client to signal its
 * completion. Note that if a conflicting fence is already on the dma-buf (i.e.
 * an exclusive fence when adding a read, or any fence when adding a write),
 * -EBUSY is reported. Serialisation between operations should be handled
 * by waiting upon the dma-buf.
 *
 * This returns the handle for the new fence that must be signaled within 10
 * seconds (or otherwise it will automatically expire). See
 * vgem_fence_signal_ioctl (DRM_IOCTL_VGEM_FENCE_SIGNAL).
 *
 * If the vGEM handle does not exist, vgem_fence_attach_ioctl returns -ENOENT.
 */
int vgem_fence_attach_ioctl(struct drm_device *dev,
			    void *data,
			    struct drm_file *file)
{
	struct drm_vgem_fence_attach *arg = data;
	struct vgem_file *vfile = file->driver_priv;
	struct reservation_object *resv;
	struct drm_gem_object *obj;
	struct dma_fence *fence;
	int ret;

	if (arg->flags & ~VGEM_FENCE_WRITE)
		return -EINVAL;

	if (arg->pad)
		return -EINVAL;

	obj = drm_gem_object_lookup(file, arg->handle);
	if (!obj)
		return -ENOENT;

	ret = attach_dmabuf(dev, obj);
	if (ret)
		goto err;

	fence = vgem_fence_create(vfile, arg->flags);
	if (!fence) {
		ret = -ENOMEM;
		goto err;
	}

	/* Check for a conflicting fence */
	resv = obj->dma_buf->resv;
	if (!reservation_object_test_signaled_rcu(resv,
						  arg->flags & VGEM_FENCE_WRITE)) {
		ret = -EBUSY;
		goto err_fence;
	}

	/* Expose the fence via the dma-buf */
	ret = 0;
	reservation_object_lock(resv, NULL);
	if (arg->flags & VGEM_FENCE_WRITE)
		reservation_object_add_excl_fence(resv, fence);
	else if ((ret = reservation_object_reserve_shared(resv, 1)) == 0)
		reservation_object_add_shared_fence(resv, fence);
	reservation_object_unlock(resv);

	/* Record the fence in our idr for later signaling */
	if (ret == 0) {
		mutex_lock(&vfile->fence_mutex);
		ret = idr_alloc(&vfile->fence_idr, fence, 1, 0, GFP_KERNEL);
		mutex_unlock(&vfile->fence_mutex);
		if (ret > 0) {
			arg->out_fence = ret;
			ret = 0;
		}
	}
err_fence:
	if (ret) {
		dma_fence_signal(fence);
		dma_fence_put(fence);
	}
err:
	drm_gem_object_put_unlocked(obj);
	return ret;
}

/*
 * vgem_fence_signal_ioctl (DRM_IOCTL_VGEM_FENCE_SIGNAL):
 *
 * Signal and consume a fence ealier attached to a vGEM handle using
 * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH).
 *
 * All fences must be signaled within 10s of attachment or otherwise they
 * will automatically expire (and a vgem_fence_signal_ioctl returns -ETIMEDOUT).
 *
 * Signaling a fence indicates to all consumers of the dma-buf that the
 * client has completed the operation associated with the fence, and that the
 * buffer is then ready for consumption.
 *
 * If the fence does not exist (or has already been signaled by the client),
 * vgem_fence_signal_ioctl returns -ENOENT.
 */
int vgem_fence_signal_ioctl(struct drm_device *dev,
			    void *data,
			    struct drm_file *file)
{
	struct vgem_file *vfile = file->driver_priv;
	struct drm_vgem_fence_signal *arg = data;
	struct dma_fence *fence;
	int ret = 0;

	if (arg->flags)
		return -EINVAL;

	mutex_lock(&vfile->fence_mutex);
	fence = idr_replace(&vfile->fence_idr, NULL, arg->fence);
	mutex_unlock(&vfile->fence_mutex);
	if (!fence)
		return -ENOENT;
	if (IS_ERR(fence))
		return PTR_ERR(fence);

	if (dma_fence_is_signaled(fence))
		ret = -ETIMEDOUT;

	dma_fence_signal(fence);
	dma_fence_put(fence);
	return ret;
}

int vgem_fence_open(struct vgem_file *vfile)
{
	mutex_init(&vfile->fence_mutex);
	idr_init(&vfile->fence_idr);

	return 0;
}

static int __vgem_fence_idr_fini(int id, void *p, void *data)
{
	dma_fence_signal(p);
	dma_fence_put(p);
	return 0;
}

void vgem_fence_close(struct vgem_file *vfile)
{
	idr_for_each(&vfile->fence_idr, __vgem_fence_idr_fini, vfile);
	idr_destroy(&vfile->fence_idr);
}