--- /dev/null
+/**
+ * \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 <linux/slab.h>
+#include <drm/drmP.h>
+#include "drm_legacy.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
+}
+
+static 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);
+
+ kfree(entry->busaddr);
+ kfree(entry->pagelist);
+ kfree(entry);
+}
+
+void drm_legacy_sg_cleanup(struct drm_device *dev)
+{
+ if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
+ !drm_core_check_feature(dev, DRIVER_MODESET)) {
+ drm_sg_cleanup(dev->sg);
+ dev->sg = NULL;
+ }
+}
+#ifdef _LP64
+# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
+#else
+# define ScatterHandle(x) (unsigned int)(x)
+#endif
+
+int drm_legacy_sg_alloc(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_scatter_gather *request = data;
+ struct drm_sg_mem *entry;
+ unsigned long pages, i, j;
+
+ DRM_DEBUG("\n");
+
+ if (drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EINVAL;
+
+ if (!drm_core_check_feature(dev, DRIVER_SG))
+ return -EINVAL;
+
+ if (dev->sg)
+ return -EINVAL;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
+ DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
+
+ entry->pages = pages;
+ entry->pagelist = kcalloc(pages, sizeof(*entry->pagelist), GFP_KERNEL);
+ if (!entry->pagelist) {
+ kfree(entry);
+ return -ENOMEM;
+ }
+
+ entry->busaddr = kcalloc(pages, sizeof(*entry->busaddr), GFP_KERNEL);
+ if (!entry->busaddr) {
+ kfree(entry->pagelist);
+ kfree(entry);
+ return -ENOMEM;
+ }
+
+ entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
+ if (!entry->virtual) {
+ kfree(entry->busaddr);
+ kfree(entry->pagelist);
+ kfree(entry);
+ 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;
+}
+
+int drm_legacy_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_MODESET))
+ return -EINVAL;
+
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff