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;
+}