Initial import of the DRM (direct rendering manager).

This is the kernel part necessary for DRI support in X. Disabled for now
because it still has a few bugs, but now I can work on it in tree. Also
requires the requisite bits in X, which are currently under discussion
on how to deal with them with privsep. ported from a combination of the
free and netbsd implementations.

Known bugs:
1) only the first occurence of X in any session will have dri, after
that something prevents it working.
2) if the machine does not have a dri capable card, the kernel panics.
Something's up in one of the probe functions. I haven't been able to
find it though.
3) radeon cards need to be forced to use PCI mode otherwise they get
into an infinite loop.

This is known to at least kinda work with SiS, radeons in pci mode and
intel cards.

ok deraadt, kinda ok art, a few other people had a quick look.

1 files changed, 129 insertions, 0 deletions

diff --git a/sys/dev/pci/drm/drm_scatter.c b/sys/dev/pci/drm/drm_scatter.c
new file mode 100644
index 00000000000..0f1d92695ce
--- /dev/null
+++ b/sys/dev/pci/drm/drm_scatter.c
@@ -0,0 +1,129 @@
+/*-
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * PRECISION INSIGHT 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.
+ *
+ * Authors:
+ *   Gareth Hughes <gareth@valinux.com>
+ *   Eric Anholt <anholt@FreeBSD.org>
+ *
+ */
+
+/** @file drm_scatter.c
+ * Allocation of memory for scatter-gather mappings by the graphics chip.
+ *
+ * The memory allocated here is then made into an aperture in the card
+ * by drm_ati_pcigart_init().
+ */
+#include "drmP.h"
+
+#define DEBUG_SCATTER 0
+
+void drm_sg_cleanup(drm_sg_mem_t *entry)
+{
+	free((void *)entry->handle, M_DRM);
+	free(entry->busaddr, M_DRM);
+	free(entry, M_DRM);
+}
+
+int drm_sg_alloc(drm_device_t * dev, drm_scatter_gather_t * request)
+{
+	drm_sg_mem_t *entry;
+	unsigned long pages;
+	int i;
+
+	if ( dev->sg )
+		return EINVAL;
+
+	entry = malloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
+	if ( !entry )
+		return ENOMEM;
+
+	pages = round_page(request->size) / PAGE_SIZE;
+	DRM_DEBUG( "sg size=%ld pages=%ld\n", request->size, pages );
+
+	entry->pages = pages;
+
+	entry->busaddr = malloc(pages * sizeof(*entry->busaddr), M_DRM,
+	    M_WAITOK | M_ZERO);
+	if ( !entry->busaddr ) {
+		drm_sg_cleanup(entry);
+		return ENOMEM;
+	}
+
+	entry->handle = (long)malloc(pages << PAGE_SHIFT, M_DRM,
+	    M_WAITOK | M_ZERO);
+	if (entry->handle == 0) {
+		drm_sg_cleanup(entry);
+		return ENOMEM;
+	}
+
+	for (i = 0; i < pages; i++) {
+		entry->busaddr[i] = vtophys(entry->handle + i * PAGE_SIZE);
+	}
+
+	DRM_DEBUG( "sg alloc handle  = %08lx\n", entry->handle );
+
+	entry->virtual = (void *)entry->handle;
+	request->handle = entry->handle;
+
+	DRM_LOCK();
+	if (dev->sg) {
+		DRM_UNLOCK();
+		drm_sg_cleanup(entry);
+		return EINVAL;
+	}
+	dev->sg = entry;
+	DRM_UNLOCK();
+
+	return 0;
+}
+
+int drm_sg_alloc_ioctl(drm_device_t *dev, void *data, struct drm_file *file_priv)
+{
+	drm_scatter_gather_t *request = data;
+	int ret;
+
+	DRM_DEBUG( "%s\n", __FUNCTION__ );
+
+	ret = drm_sg_alloc(dev, request);
+	return ret;
+}
+
+int drm_sg_free(drm_device_t *dev, void *data, struct drm_file *file_priv)
+{
+	drm_scatter_gather_t *request = data;
+	drm_sg_mem_t *entry;
+
+	DRM_LOCK();
+	entry = dev->sg;
+	dev->sg = NULL;
+	DRM_UNLOCK();
+
+	if ( !entry || entry->handle != request->handle )
+		return EINVAL;
+
+	DRM_DEBUG( "sg free virtual  = 0x%lx\n", entry->handle );
+
+	drm_sg_cleanup(entry);
+
+	return 0;
+}