1 files changed, 227 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_scatter.c b/drivers/gpu/drm/drm_scatter.c
new file mode 100644
index 000000000000..b2b0f3d41714
--- /dev/null
+++ b/drivers/gpu/drm/drm_scatter.c
@@ -0,0 +1,227 @@
+/**
+ * \file drm_scatter.c
+ * IOCTLs to manage scatter/gather memory
+ *
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
+ *
+ * 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.
+ */
+
+#include <linux/vmalloc.h>
+#include "drmP.h"
+
+#define DEBUG_SCATTER 0
+
+static inline void *drm_vmalloc_dma(unsigned long size)
+{
+#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
+        return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE);
+#else
+        return vmalloc_32(size);
+#endif
+}
+
+void drm_sg_cleanup(struct drm_sg_mem * entry)
+{
+        struct page *page;
+        int i;
+
+        for (i = 0; i < entry->pages; i++) {
+                page = entry->pagelist[i];
+                if (page)
+                        ClearPageReserved(page);
+        }
+
+        vfree(entry->virtual);
+
+        drm_free(entry->busaddr,
+                 entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
+        drm_free(entry->pagelist,
+                 entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES);
+        drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
+}
+
+#ifdef _LP64
+# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
+#else
+# define ScatterHandle(x) (unsigned int)(x)
+#endif
+
+int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
+{
+        struct drm_sg_mem *entry;
+        unsigned long pages, i, j;
+
+        DRM_DEBUG("\n");
+
+        if (!drm_core_check_feature(dev, DRIVER_SG))
+                return -EINVAL;
+
+        if (dev->sg)
+                return -EINVAL;
+
+        entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS);
+        if (!entry)
+                return -ENOMEM;
+
+        memset(entry, 0, sizeof(*entry));
+        pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
+        DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
+
+        entry->pages = pages;
+        entry->pagelist = drm_alloc(pages * sizeof(*entry->pagelist),
+                                    DRM_MEM_PAGES);
+        if (!entry->pagelist) {
+                drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
+                return -ENOMEM;
+        }
+
+        memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));
+
+        entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr),
+                                   DRM_MEM_PAGES);
+        if (!entry->busaddr) {
+                drm_free(entry->pagelist,
+                         entry->pages * sizeof(*entry->pagelist),
+                         DRM_MEM_PAGES);
+                drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
+                return -ENOMEM;
+        }
+        memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr));
+
+        entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
+        if (!entry->virtual) {
+                drm_free(entry->busaddr,
+                         entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES);
+                drm_free(entry->pagelist,
+                         entry->pages * sizeof(*entry->pagelist),
+                         DRM_MEM_PAGES);
+                drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS);
+                return -ENOMEM;
+        }
+
+        /* This also forces the mapping of COW pages, so our page list
+         * will be valid.  Please don't remove it...
+         */
+        memset(entry->virtual, 0, pages << PAGE_SHIFT);
+
+        entry->handle = ScatterHandle((unsigned long)entry->virtual);
+
+        DRM_DEBUG("handle  = %08lx\n", entry->handle);
+        DRM_DEBUG("virtual = %p\n", entry->virtual);
+
+        for (i = (unsigned long)entry->virtual, j = 0; j < pages;
+             i += PAGE_SIZE, j++) {
+                entry->pagelist[j] = vmalloc_to_page((void *)i);
+                if (!entry->pagelist[j])
+                        goto failed;
+                SetPageReserved(entry->pagelist[j]);
+        }
+
+        request->handle = entry->handle;
+
+        dev->sg = entry;
+
+#if DEBUG_SCATTER
+        /* Verify that each page points to its virtual address, and vice
+         * versa.
+         */
+        {
+                int error = 0;
+
+                for (i = 0; i < pages; i++) {
+                        unsigned long *tmp;
+
+                        tmp = page_address(entry->pagelist[i]);
+                        for (j = 0;
+                             j < PAGE_SIZE / sizeof(unsigned long);
+                             j++, tmp++) {
+                                *tmp = 0xcafebabe;
+                        }
+                        tmp = (unsigned long *)((u8 *) entry->virtual +
+                                                (PAGE_SIZE * i));
+                        for (j = 0;
+                             j < PAGE_SIZE / sizeof(unsigned long);
+                             j++, tmp++) {
+                                if (*tmp != 0xcafebabe && error == 0) {
+                                        error = 1;
+                                        DRM_ERROR("Scatter allocation error, "
+                                                  "pagelist does not match "
+                                                  "virtual mapping\n");
+                                }
+                        }
+                        tmp = page_address(entry->pagelist[i]);
+                        for (j = 0;
+                             j < PAGE_SIZE / sizeof(unsigned long);
+                             j++, tmp++) {
+                                *tmp = 0;
+                        }
+                }
+                if (error == 0)
+                        DRM_ERROR("Scatter allocation matches pagelist\n");
+        }
+#endif
+
+        return 0;
+
+      failed:
+        drm_sg_cleanup(entry);
+        return -ENOMEM;
+}
+EXPORT_SYMBOL(drm_sg_alloc);
+
+
+int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
+                       struct drm_file *file_priv)
+{
+        struct drm_scatter_gather *request = data;
+
+        return drm_sg_alloc(dev, request);
+
+}
+
+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;
+
+        if (!drm_core_check_feature(dev, DRIVER_SG))
+                return -EINVAL;
+
+        entry = dev->sg;
+        dev->sg = NULL;
+
+        if (!entry || entry->handle != request->handle)
+                return -EINVAL;
+
+        DRM_DEBUG("virtual  = %p\n", entry->virtual);
+
+        drm_sg_cleanup(entry);
+
+        return 0;
+}