302 lines
8.8 KiB
C
302 lines
8.8 KiB
C
/* vm.c -- Memory mapping for DRM -*- linux-c -*-
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* Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com
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* Revised: Mon Dec 6 16:54:35 1999 by faith@precisioninsight.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* $PI: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.7 1999/08/21 02:48:34 faith Exp $
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* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/kernel/vm.c,v 1.2 1999/12/14 01:33:58 robin Exp $
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*
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*/
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#define __NO_VERSION__
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#include "drmP.h"
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struct vm_operations_struct drm_vm_ops = {
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nopage: drm_vm_nopage,
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open: drm_vm_open,
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close: drm_vm_close,
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};
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struct vm_operations_struct drm_vm_shm_ops = {
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nopage: drm_vm_shm_nopage,
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open: drm_vm_open,
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close: drm_vm_close,
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};
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struct vm_operations_struct drm_vm_dma_ops = {
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nopage: drm_vm_dma_nopage,
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open: drm_vm_open,
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close: drm_vm_close,
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};
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#if LINUX_VERSION_CODE < 0x020317
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unsigned long drm_vm_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int write_access)
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#else
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/* Return type changed in 2.3.23 */
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struct page *drm_vm_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int write_access)
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#endif
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{
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DRM_DEBUG("0x%08lx, %d\n", address, write_access);
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return NOPAGE_SIGBUS; /* Disallow mremap */
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}
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#if LINUX_VERSION_CODE < 0x020317
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unsigned long drm_vm_shm_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int write_access)
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#else
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/* Return type changed in 2.3.23 */
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struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int write_access)
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#endif
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->dev;
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unsigned long physical;
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unsigned long offset;
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unsigned long page;
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if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
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if (!dev->lock.hw_lock) return NOPAGE_OOM; /* Nothing allocated */
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offset = address - vma->vm_start;
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page = offset >> PAGE_SHIFT;
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physical = (unsigned long)dev->lock.hw_lock + (offset & (~PAGE_MASK));
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atomic_inc(&mem_map[MAP_NR(physical)].count); /* Dec. by kernel */
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DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical);
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#if LINUX_VERSION_CODE < 0x020317
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return physical;
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#else
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return mem_map + MAP_NR(physical);
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#endif
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}
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#if LINUX_VERSION_CODE < 0x020317
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unsigned long drm_vm_dma_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int write_access)
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#else
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/* Return type changed in 2.3.23 */
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struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
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unsigned long address,
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int write_access)
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#endif
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->dev;
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drm_device_dma_t *dma = dev->dma;
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unsigned long physical;
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unsigned long offset;
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unsigned long page;
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if (!dma) return NOPAGE_SIGBUS; /* Error */
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if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
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if (!dma->pagelist) return NOPAGE_OOM ; /* Nothing allocated */
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offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
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page = offset >> PAGE_SHIFT;
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physical = dma->pagelist[page] + (offset & (~PAGE_MASK));
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atomic_inc(&mem_map[MAP_NR(physical)].count); /* Dec. by kernel */
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DRM_DEBUG("0x%08lx (page %lu) => 0x%08lx\n", address, page, physical);
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#if LINUX_VERSION_CODE < 0x020317
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return physical;
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#else
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return mem_map + MAP_NR(physical);
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#endif
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}
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void drm_vm_open(struct vm_area_struct *vma)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->dev;
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#if DRM_DEBUG_CODE
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drm_vma_entry_t *vma_entry;
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#endif
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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atomic_inc(&dev->vma_count);
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MOD_INC_USE_COUNT;
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#if DRM_DEBUG_CODE
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vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
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if (vma_entry) {
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down(&dev->struct_sem);
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vma_entry->vma = vma;
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vma_entry->next = dev->vmalist;
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vma_entry->pid = current->pid;
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dev->vmalist = vma_entry;
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up(&dev->struct_sem);
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}
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#endif
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}
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void drm_vm_close(struct vm_area_struct *vma)
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{
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drm_file_t *priv = vma->vm_file->private_data;
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drm_device_t *dev = priv->dev;
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#if DRM_DEBUG_CODE
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drm_vma_entry_t *pt, *prev;
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#endif
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DRM_DEBUG("0x%08lx,0x%08lx\n",
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vma->vm_start, vma->vm_end - vma->vm_start);
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MOD_DEC_USE_COUNT;
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atomic_dec(&dev->vma_count);
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#if DRM_DEBUG_CODE
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down(&dev->struct_sem);
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for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
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if (pt->vma == vma) {
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if (prev) {
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prev->next = pt->next;
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} else {
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dev->vmalist = pt->next;
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}
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drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
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break;
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}
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}
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up(&dev->struct_sem);
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#endif
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}
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int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_device_dma_t *dma = dev->dma;
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unsigned long length = vma->vm_end - vma->vm_start;
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DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
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vma->vm_start, vma->vm_end, VM_OFFSET(vma));
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/* Length must match exact page count */
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if ((length >> PAGE_SHIFT) != dma->page_count) return -EINVAL;
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vma->vm_ops = &drm_vm_dma_ops;
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vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
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#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
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/* In Linux 2.2.3 and above, this is
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handled in do_mmap() in mm/mmap.c. */
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++filp->f_count;
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#endif
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vma->vm_file = filp; /* Needed for drm_vm_open() */
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drm_vm_open(vma);
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return 0;
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}
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int drm_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_map_t *map = NULL;
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int i;
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DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
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vma->vm_start, vma->vm_end, VM_OFFSET(vma));
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if (!VM_OFFSET(vma)) return drm_mmap_dma(filp, vma);
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/* A sequential search of a linked list is
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fine here because: 1) there will only be
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about 5-10 entries in the list and, 2) a
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DRI client only has to do this mapping
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once, so it doesn't have to be optimized
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for performance, even if the list was a
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bit longer. */
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for (i = 0; i < dev->map_count; i++) {
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map = dev->maplist[i];
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if (map->offset == VM_OFFSET(vma)) break;
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}
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if (i >= dev->map_count) return -EINVAL;
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if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
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return -EPERM;
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/* Check for valid size. */
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if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;
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switch (map->type) {
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case _DRM_FRAME_BUFFER:
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case _DRM_REGISTERS:
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if (VM_OFFSET(vma) >= __pa(high_memory)) {
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#if defined(__i386__)
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if (boot_cpu_data.x86 > 3) {
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pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
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pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
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}
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#endif
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vma->vm_flags |= VM_IO; /* not in core dump */
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}
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if (remap_page_range(vma->vm_start,
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VM_OFFSET(vma),
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vma->vm_end - vma->vm_start,
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vma->vm_page_prot))
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return -EAGAIN;
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vma->vm_ops = &drm_vm_ops;
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break;
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case _DRM_SHM:
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vma->vm_ops = &drm_vm_shm_ops;
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/* Don't let this area swap. Change when
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DRM_KERNEL advisory is supported. */
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vma->vm_flags |= VM_LOCKED;
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break;
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default:
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return -EINVAL; /* This should never happen. */
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}
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vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
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if (map->flags & _DRM_READ_ONLY) {
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#if defined(__i386__)
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pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
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#else
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/* Ye gads this is ugly. With more thought
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we could move this up higher and use
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`protection_map' instead. */
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vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
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__pte(pgprot_val(vma->vm_page_prot)))));
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#endif
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}
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#if LINUX_VERSION_CODE < 0x020203 /* KERNEL_VERSION(2,2,3) */
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/* In Linux 2.2.3 and above, this is
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handled in do_mmap() in mm/mmap.c. */
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++filp->f_count;
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#endif
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vma->vm_file = filp; /* Needed for drm_vm_open() */
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drm_vm_open(vma);
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return 0;
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}
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