1 files changed, 129 insertions, 0 deletions
diff --git a/sys/dev/drm2/drm_scatter.c b/sys/dev/drm2/drm_scatter.c
new file mode 100644
index 0000000..ecf231f
--- /dev/null
+++ b/sys/dev/drm2/drm_scatter.c
@@ -0,0 +1,129 @@
+/*-
+ * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/** @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 mapping the pages into the GART.
+ */
+
+#include <dev/drm2/drmP.h>
+
+int
+drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
+{
+	struct drm_sg_mem *entry;
+	vm_size_t size;
+	vm_pindex_t pindex;
+
+	if (dev->sg)
+		return EINVAL;
+
+	DRM_DEBUG("request size=%ld\n", request->size);
+
+	entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_WAITOK | M_ZERO);
+
+	size = round_page(request->size);
+	entry->pages = OFF_TO_IDX(size);
+	entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
+	    DRM_MEM_SGLISTS, M_WAITOK | M_ZERO);
+
+	entry->vaddr = kmem_alloc_attr(kernel_map, size, M_WAITOK | M_ZERO,
+	    0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
+	if (entry->vaddr == 0) {
+		drm_sg_cleanup(entry);
+		return (ENOMEM);
+	}
+
+	for(pindex = 0; pindex < entry->pages; pindex++) {
+		entry->busaddr[pindex] =
+		    vtophys(entry->vaddr + IDX_TO_OFF(pindex));
+	}
+
+	DRM_LOCK(dev);
+	if (dev->sg) {
+		DRM_UNLOCK(dev);
+		drm_sg_cleanup(entry);
+		return (EINVAL);
+	}
+	dev->sg = entry;
+	DRM_UNLOCK(dev);
+
+	request->handle = entry->vaddr;
+
+	DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n",
+	    entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
+
+	return (0);
+}
+
+int
+drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
+		   struct drm_file *file_priv)
+{
+	struct drm_scatter_gather *request = data;
+
+	DRM_DEBUG("\n");
+
+	return (drm_sg_alloc(dev, request));
+}
+
+void
+drm_sg_cleanup(struct drm_sg_mem *entry)
+{
+	if (entry == NULL)
+		return;
+
+	if (entry->vaddr != 0)
+		kmem_free(kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages));
+
+	free(entry->busaddr, DRM_MEM_SGLISTS);
+	free(entry, DRM_MEM_DRIVER);
+
+	return;
+}
+
+int
+drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+	struct drm_scatter_gather *request = data;
+	struct drm_sg_mem *entry;
+
+	DRM_LOCK(dev);
+	entry = dev->sg;
+	dev->sg = NULL;
+	DRM_UNLOCK(dev);
+
+	if (!entry || entry->vaddr != request->handle)
+		return (EINVAL);
+
+	DRM_DEBUG("free 0x%zx\n", entry->vaddr);
+
+	drm_sg_cleanup(entry);
+
+	return (0);
+}