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-rw-r--r--linux/vm.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/linux/vm.c b/linux/vm.c
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index 00000000..89803784
--- /dev/null
+++ b/linux/vm.c
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+/* vm.c -- Memory mapping for DRM -*- linux-c -*-
+ * Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com
+ * Revised: Fri Aug 20 22:48:11 1999 by faith@precisioninsight.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * 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.
+ *
+ * $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.7 1999/08/21 02:48:34 faith Exp $
+ * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.1 1999/09/25 14:38:02 dawes Exp $
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+struct vm_operations_struct drm_vm_ops = {
+ nopage: drm_vm_nopage,
+ open: drm_vm_open,
+ close: drm_vm_close,
+};
+
+struct vm_operations_struct drm_vm_shm_ops = {
+ nopage: drm_vm_shm_nopage,
+ open: drm_vm_open,
+ close: drm_vm_close,
+};
+
+struct vm_operations_struct drm_vm_dma_ops = {
+ nopage: drm_vm_dma_nopage,
+ open: drm_vm_open,
+ close: drm_vm_close,
+};
+
+unsigned long drm_vm_nopage(struct vm_area_struct *vma,
+ unsigned long address,
+ int write_access)
+{
+ DRM_DEBUG("0x%08lx, %d\n", address, write_access);
+
+ return 0; /* Disallow mremap */
+}
+
+unsigned long drm_vm_shm_nopage(struct vm_area_struct *vma,
+ unsigned long address,
+ int write_access)
+{
+ drm_file_t *priv = vma->vm_file->private_data;
+ drm_device_t *dev = priv->dev;
+ unsigned long physical;
+ unsigned long offset;
+ unsigned long page;
+
+ if (address > vma->vm_end) return 0; /* Disallow mremap */
+ if (!dev->lock.hw_lock) return 0; /* Nothing allocated */
+
+ offset = address - vma->vm_start;
+ page = offset >> PAGE_SHIFT;
+ physical = (unsigned long)dev->lock.hw_lock + (offset & (~PAGE_MASK));
+ atomic_inc(&mem_map[MAP_NR(physical)].count); /* Dec. by kernel */
+
+ DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical);
+ return physical;
+}
+
+unsigned long drm_vm_dma_nopage(struct vm_area_struct *vma,
+ unsigned long address,
+ int write_access)
+{
+ drm_file_t *priv = vma->vm_file->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_device_dma_t *dma = dev->dma;
+ unsigned long physical;
+ unsigned long offset;
+ unsigned long page;
+
+ if (!dma) return 0; /* Error */
+ if (address > vma->vm_end) return 0; /* Disallow mremap */
+ if (!dma->pagelist) return 0; /* Nothing allocated */
+
+ offset = address - vma->vm_start; /* vm_offset should be 0 */
+ page = offset >> PAGE_SHIFT;
+ physical = dma->pagelist[page] + (offset & (~PAGE_MASK));
+ atomic_inc(&mem_map[MAP_NR(physical)].count); /* Dec. by kernel */
+
+ DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical);
+ return physical;
+}
+
+void drm_vm_open(struct vm_area_struct *vma)
+{
+ drm_file_t *priv = vma->vm_file->private_data;
+ drm_device_t *dev = priv->dev;
+#if DRM_DEBUG_CODE
+ drm_vma_entry_t *vma_entry;
+#endif
+
+ DRM_DEBUG("0x%08lx,0x%08lx\n",
+ vma->vm_start, vma->vm_end - vma->vm_start);
+ atomic_inc(&dev->vma_count);
+ MOD_INC_USE_COUNT;
+
+#if DRM_DEBUG_CODE
+ vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
+ if (vma_entry) {
+ down(&dev->struct_sem);
+ vma_entry->vma = vma;
+ vma_entry->next = dev->vmalist;
+ vma_entry->pid = current->pid;
+ dev->vmalist = vma_entry;
+ up(&dev->struct_sem);
+ }
+#endif
+}
+
+void drm_vm_close(struct vm_area_struct *vma)
+{
+ drm_file_t *priv = vma->vm_file->private_data;
+ drm_device_t *dev = priv->dev;
+#if DRM_DEBUG_CODE
+ drm_vma_entry_t *pt, *prev;
+#endif
+
+ DRM_DEBUG("0x%08lx,0x%08lx\n",
+ vma->vm_start, vma->vm_end - vma->vm_start);
+ MOD_DEC_USE_COUNT;
+ atomic_dec(&dev->vma_count);
+
+#if DRM_DEBUG_CODE
+ down(&dev->struct_sem);
+ for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
+ if (pt->vma == vma) {
+ if (prev) {
+ prev->next = pt->next;
+ } else {
+ dev->vmalist = pt->next;
+ }
+ drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
+ break;
+ }
+ }
+ up(&dev->struct_sem);
+#endif
+}
+
+int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_device_dma_t *dma = dev->dma;
+ unsigned long length = vma->vm_end - vma->vm_start;
+
+ DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
+ vma->vm_start, vma->vm_end, vma->vm_offset);
+
+ /* Length must match exact page count */
+ if ((length >> PAGE_SHIFT) != dma->page_count) return -EINVAL;
+
+ vma->vm_ops = &drm_vm_dma_ops;
+ vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
+
+#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
+ /* In Linux 2.2.3 and above, this is
+ handled in do_mmap() in mm/mmap.c. */
+ ++filp->f_count;
+#endif
+ vma->vm_file = filp; /* Needed for drm_vm_open() */
+ drm_vm_open(vma);
+ return 0;
+}
+
+int drm_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_map_t *map = NULL;
+ int i;
+
+ DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
+ vma->vm_start, vma->vm_end, vma->vm_offset);
+
+ if (!vma->vm_offset) return drm_mmap_dma(filp, vma);
+
+ /* A sequential search of a linked list is
+ fine here because: 1) there will only be
+ about 5-10 entries in the list and, 2) a
+ DRI client only has to do this mapping
+ once, so it doesn't have to be optimized
+ for performance, even if the list was a
+ bit longer. */
+ for (i = 0; i < dev->map_count; i++) {
+ map = dev->maplist[i];
+ if (map->offset == vma->vm_offset) break;
+ }
+
+ if (i >= dev->map_count) return -EINVAL;
+ if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
+ return -EPERM;
+
+ /* Check for valid size. */
+ if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;
+
+
+ switch (map->type) {
+ case _DRM_FRAME_BUFFER:
+ case _DRM_REGISTERS:
+ if (vma->vm_offset >= __pa(high_memory)) {
+#if defined(__i386__)
+ if (boot_cpu_data.x86 > 3) {
+ pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
+ pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
+ }
+#endif
+ vma->vm_flags |= VM_IO; /* not in core dump */
+ }
+ if (remap_page_range(vma->vm_start,
+ vma->vm_offset,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot))
+ return -EAGAIN;
+ vma->vm_ops = &drm_vm_ops;
+ break;
+ case _DRM_SHM:
+ vma->vm_ops = &drm_vm_shm_ops;
+ /* Don't let this area swap. Change when
+ DRM_KERNEL advisory is supported. */
+ vma->vm_flags |= VM_LOCKED;
+ break;
+ default:
+ return -EINVAL; /* This should never happen. */
+ }
+ vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
+ if (map->flags & _DRM_READ_ONLY) {
+ pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
+ }
+
+
+#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
+ /* In Linux 2.2.3 and above, this is
+ handled in do_mmap() in mm/mmap.c. */
+ ++filp->f_count;
+#endif
+ vma->vm_file = filp; /* Needed for drm_vm_open() */
+ drm_vm_open(vma);
+ return 0;
+}