1 files changed, 678 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_vm.c b/drivers/char/drm/drm_vm.c
new file mode 100644
index 000000000000..fc72f30f312b
--- /dev/null
+++ b/drivers/char/drm/drm_vm.c
@@ -0,0 +1,678 @@
+/**
+ * \file drm_vm.h
+ * Memory mapping for DRM
+ * 
+ * \author Rickard E. (Rik) Faith <faith@valinux.com>
+ * \author Gareth Hughes <gareth@valinux.com>
+ */
+
+/*
+ * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
+ *
+ * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
+ * 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
+ * VA LINUX SYSTEMS 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 "drmP.h"
+#if defined(__ia64__)
+#include <linux/efi.h>
+#endif
+
+
+/**
+ * \c nopage method for AGP virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ * 
+ * Find the right map and if it's AGP memory find the real physical page to
+ * map, get the page, increment the use count and return it.
+ */
+#if __OS_HAS_AGP
+static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
+                                                 unsigned long address)
+{
+        drm_file_t *priv  = vma->vm_file->private_data;
+        drm_device_t *dev = priv->head->dev;
+        drm_map_t *map    = NULL;
+        drm_map_list_t  *r_list;
+        struct list_head *list;
+
+        /*
+         * Find the right map
+         */
+        if (!drm_core_has_AGP(dev))
+                goto vm_nopage_error;
+
+        if(!dev->agp || !dev->agp->cant_use_aperture) goto vm_nopage_error;
+
+        list_for_each(list, &dev->maplist->head) {
+                r_list = list_entry(list, drm_map_list_t, head);
+                map = r_list->map;
+                if (!map) continue;
+                if (map->offset == VM_OFFSET(vma)) break;
+        }
+
+        if (map && map->type == _DRM_AGP) {
+                unsigned long offset = address - vma->vm_start;
+                unsigned long baddr = VM_OFFSET(vma) + offset;
+                struct drm_agp_mem *agpmem;
+                struct page *page;
+
+#ifdef __alpha__
+                /*
+                 * Adjust to a bus-relative address
+                 */
+                baddr -= dev->hose->mem_space->start;
+#endif
+
+                /*
+                 * It's AGP memory - find the real physical page to map
+                 */
+                for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
+                        if (agpmem->bound <= baddr &&
+                            agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 
+                                break;
+                }
+
+                if (!agpmem) goto vm_nopage_error;
+
+                /*
+                 * Get the page, inc the use count, and return it
+                 */
+                offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
+                page = virt_to_page(__va(agpmem->memory->memory[offset]));
+                get_page(page);
+
+                DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
+                          baddr, __va(agpmem->memory->memory[offset]), offset,
+                          page_count(page));
+
+                return page;
+        }
+vm_nopage_error:
+        return NOPAGE_SIGBUS;           /* Disallow mremap */
+}
+#else /* __OS_HAS_AGP */
+static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
+                                                 unsigned long address)
+{
+        return NOPAGE_SIGBUS;
+}
+#endif /* __OS_HAS_AGP */
+
+/**
+ * \c nopage method for shared virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ * 
+ * Get the the mapping, find the real physical page to map, get the page, and
+ * return it.
+ */
+static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
+                                                     unsigned long address)
+{
+        drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
+        unsigned long    offset;
+        unsigned long    i;
+        struct page      *page;
+
+        if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
+        if (!map)                  return NOPAGE_OOM;  /* Nothing allocated */
+
+        offset   = address - vma->vm_start;
+        i = (unsigned long)map->handle + offset;
+        page = vmalloc_to_page((void *)i);
+        if (!page)
+                return NOPAGE_OOM;
+        get_page(page);
+
+        DRM_DEBUG("shm_nopage 0x%lx\n", address);
+        return page;
+}
+
+
+/**
+ * \c close method for shared virtual memory.
+ * 
+ * \param vma virtual memory area.
+ * 
+ * Deletes map information if we are the last
+ * person to close a mapping and it's not in the global maplist.
+ */
+void drm_vm_shm_close(struct vm_area_struct *vma)
+{
+        drm_file_t      *priv   = vma->vm_file->private_data;
+        drm_device_t    *dev    = priv->head->dev;
+        drm_vma_entry_t *pt, *prev, *next;
+        drm_map_t *map;
+        drm_map_list_t *r_list;
+        struct list_head *list;
+        int found_maps = 0;
+
+        DRM_DEBUG("0x%08lx,0x%08lx\n",
+                  vma->vm_start, vma->vm_end - vma->vm_start);
+        atomic_dec(&dev->vma_count);
+
+        map = vma->vm_private_data;
+
+        down(&dev->struct_sem);
+        for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
+                next = pt->next;
+                if (pt->vma->vm_private_data == map) found_maps++;
+                if (pt->vma == vma) {
+                        if (prev) {
+                                prev->next = pt->next;
+                        } else {
+                                dev->vmalist = pt->next;
+                        }
+                        drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
+                } else {
+                        prev = pt;
+                }
+        }
+        /* We were the only map that was found */
+        if(found_maps == 1 &&
+           map->flags & _DRM_REMOVABLE) {
+                /* Check to see if we are in the maplist, if we are not, then
+                 * we delete this mappings information.
+                 */
+                found_maps = 0;
+                list = &dev->maplist->head;
+                list_for_each(list, &dev->maplist->head) {
+                        r_list = list_entry(list, drm_map_list_t, head);
+                        if (r_list->map == map) found_maps++;
+                }
+
+                if(!found_maps) {
+                        switch (map->type) {
+                        case _DRM_REGISTERS:
+                        case _DRM_FRAME_BUFFER:
+                                if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
+                                        int retcode;
+                                        retcode = mtrr_del(map->mtrr,
+                                                           map->offset,
+                                                           map->size);
+                                        DRM_DEBUG("mtrr_del = %d\n", retcode);
+                                }
+                                drm_ioremapfree(map->handle, map->size, dev);
+                                break;
+                        case _DRM_SHM:
+                                vfree(map->handle);
+                                break;
+                        case _DRM_AGP:
+                        case _DRM_SCATTER_GATHER:
+                                break;
+                        }
+                        drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+                }
+        }
+        up(&dev->struct_sem);
+}
+
+/**
+ * \c nopage method for DMA virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ * 
+ * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
+ */
+static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
+                                                     unsigned long address)
+{
+        drm_file_t       *priv   = vma->vm_file->private_data;
+        drm_device_t     *dev    = priv->head->dev;
+        drm_device_dma_t *dma    = dev->dma;
+        unsigned long    offset;
+        unsigned long    page_nr;
+        struct page      *page;
+
+        if (!dma)                  return NOPAGE_SIGBUS; /* Error */
+        if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
+        if (!dma->pagelist)        return NOPAGE_OOM ; /* Nothing allocated */
+
+        offset   = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
+        page_nr  = offset >> PAGE_SHIFT;
+        page = virt_to_page((dma->pagelist[page_nr] + 
+                             (offset & (~PAGE_MASK))));
+
+        get_page(page);
+
+        DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
+        return page;
+}
+
+/**
+ * \c nopage method for scatter-gather virtual memory.
+ *
+ * \param vma virtual memory area.
+ * \param address access address.
+ * \return pointer to the page structure.
+ * 
+ * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
+ */
+static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
+                                                    unsigned long address)
+{
+        drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
+        drm_file_t *priv = vma->vm_file->private_data;
+        drm_device_t *dev = priv->head->dev;
+        drm_sg_mem_t *entry = dev->sg;
+        unsigned long offset;
+        unsigned long map_offset;
+        unsigned long page_offset;
+        struct page *page;
+
+        if (!entry)                return NOPAGE_SIGBUS; /* Error */
+        if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
+        if (!entry->pagelist)      return NOPAGE_OOM ;  /* Nothing allocated */
+
+
+        offset = address - vma->vm_start;
+        map_offset = map->offset - dev->sg->handle;
+        page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
+        page = entry->pagelist[page_offset];
+        get_page(page);
+
+        return page;
+}
+
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
+
+static struct page *drm_vm_nopage(struct vm_area_struct *vma,
+                                   unsigned long address,
+                                   int *type) {
+        if (type) *type = VM_FAULT_MINOR;
+        return drm_do_vm_nopage(vma, address);
+}
+
+static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
+                                       unsigned long address,
+                                       int *type) {
+        if (type) *type = VM_FAULT_MINOR;
+        return drm_do_vm_shm_nopage(vma, address);
+}
+
+static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
+                                       unsigned long address,
+                                       int *type) {
+        if (type) *type = VM_FAULT_MINOR;
+        return drm_do_vm_dma_nopage(vma, address);
+}
+
+static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
+                                      unsigned long address,
+                                      int *type) {
+        if (type) *type = VM_FAULT_MINOR;
+        return drm_do_vm_sg_nopage(vma, address);
+}
+
+#else   /* LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,0) */
+
+static struct page *drm_vm_nopage(struct vm_area_struct *vma,
+                                   unsigned long address,
+                                   int unused) {
+        return drm_do_vm_nopage(vma, address);
+}
+
+static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
+                                       unsigned long address,
+                                       int unused) {
+        return drm_do_vm_shm_nopage(vma, address);
+}
+
+static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
+                                       unsigned long address,
+                                       int unused) {
+        return drm_do_vm_dma_nopage(vma, address);
+}
+
+static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
+                                      unsigned long address,
+                                      int unused) {
+        return drm_do_vm_sg_nopage(vma, address);
+}
+
+#endif
+
+
+/** AGP virtual memory operations */
+static struct vm_operations_struct   drm_vm_ops = {
+        .nopage = drm_vm_nopage,
+        .open   = drm_vm_open,
+        .close  = drm_vm_close,
+};
+
+/** Shared virtual memory operations */
+static struct vm_operations_struct   drm_vm_shm_ops = {
+        .nopage = drm_vm_shm_nopage,
+        .open   = drm_vm_open,
+        .close  = drm_vm_shm_close,
+};
+
+/** DMA virtual memory operations */
+static struct vm_operations_struct   drm_vm_dma_ops = {
+        .nopage = drm_vm_dma_nopage,
+        .open   = drm_vm_open,
+        .close  = drm_vm_close,
+};
+
+/** Scatter-gather virtual memory operations */
+static struct vm_operations_struct   drm_vm_sg_ops = {
+        .nopage = drm_vm_sg_nopage,
+        .open   = drm_vm_open,
+        .close  = drm_vm_close,
+};
+
+
+/**
+ * \c open method for shared virtual memory.
+ * 
+ * \param vma virtual memory area.
+ * 
+ * Create a new drm_vma_entry structure as the \p vma private data entry and
+ * add it to drm_device::vmalist.
+ */
+void drm_vm_open(struct vm_area_struct *vma)
+{
+        drm_file_t      *priv   = vma->vm_file->private_data;
+        drm_device_t    *dev    = priv->head->dev;
+        drm_vma_entry_t *vma_entry;
+
+        DRM_DEBUG("0x%08lx,0x%08lx\n",
+                  vma->vm_start, vma->vm_end - vma->vm_start);
+        atomic_inc(&dev->vma_count);
+
+        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);
+        }
+}
+
+/**
+ * \c close method for all virtual memory types.
+ * 
+ * \param vma virtual memory area.
+ * 
+ * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
+ * free it.
+ */
+void drm_vm_close(struct vm_area_struct *vma)
+{
+        drm_file_t      *priv   = vma->vm_file->private_data;
+        drm_device_t    *dev    = priv->head->dev;
+        drm_vma_entry_t *pt, *prev;
+
+        DRM_DEBUG("0x%08lx,0x%08lx\n",
+                  vma->vm_start, vma->vm_end - vma->vm_start);
+        atomic_dec(&dev->vma_count);
+
+        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);
+}
+
+/**
+ * mmap DMA memory.
+ *
+ * \param filp file pointer.
+ * \param vma virtual memory area.
+ * \return zero on success or a negative number on failure.
+ * 
+ * Sets the virtual memory area operations structure to vm_dma_ops, the file
+ * pointer, and calls vm_open().
+ */
+int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
+{
+        drm_file_t       *priv   = filp->private_data;
+        drm_device_t     *dev;
+        drm_device_dma_t *dma;
+        unsigned long    length  = vma->vm_end - vma->vm_start;
+
+        lock_kernel();
+        dev      = priv->head->dev;
+        dma      = dev->dma;
+        DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
+                  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
+
+                                /* Length must match exact page count */
+        if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
+                unlock_kernel();
+                return -EINVAL;
+        }
+        unlock_kernel();
+
+        vma->vm_ops   = &drm_vm_dma_ops;
+
+#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
+        vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
+#else
+        vma->vm_flags |= VM_RESERVED; /* Don't swap */
+#endif
+
+        vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
+        drm_vm_open(vma);
+        return 0;
+}
+
+unsigned long drm_core_get_map_ofs(drm_map_t *map)
+{
+        return map->offset;
+}
+EXPORT_SYMBOL(drm_core_get_map_ofs);
+
+unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
+{
+#ifdef __alpha__
+        return dev->hose->dense_mem_base - dev->hose->mem_space->start;
+#else
+        return 0;
+#endif
+}
+EXPORT_SYMBOL(drm_core_get_reg_ofs);
+
+/**
+ * mmap DMA memory.
+ *
+ * \param filp file pointer.
+ * \param vma virtual memory area.
+ * \return zero on success or a negative number on failure.
+ * 
+ * If the virtual memory area has no offset associated with it then it's a DMA
+ * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
+ * checks that the restricted flag is not set, sets the virtual memory operations
+ * according to the mapping type and remaps the pages. Finally sets the file
+ * pointer and calls vm_open().
+ */
+int drm_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+        drm_file_t      *priv   = filp->private_data;
+        drm_device_t    *dev    = priv->head->dev;
+        drm_map_t       *map    = NULL;
+        drm_map_list_t  *r_list;
+        unsigned long   offset  = 0;
+        struct list_head *list;
+
+        DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
+                  vma->vm_start, vma->vm_end, VM_OFFSET(vma));
+
+        if ( !priv->authenticated ) return -EACCES;
+
+        /* We check for "dma". On Apple's UniNorth, it's valid to have
+         * the AGP mapped at physical address 0
+         * --BenH.
+         */
+        if (!VM_OFFSET(vma)
+#if __OS_HAS_AGP
+            && (!dev->agp || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
+#endif
+            )
+                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. */
+        list_for_each(list, &dev->maplist->head) {
+                unsigned long off;
+
+                r_list = list_entry(list, drm_map_list_t, head);
+                map = r_list->map;
+                if (!map) continue;
+                off = dev->driver->get_map_ofs(map);
+                if (off == VM_OFFSET(vma)) break;
+        }
+
+        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;
+
+        if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
+                vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
+#if defined(__i386__) || defined(__x86_64__)
+                pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
+#else
+                                /* Ye gads this is ugly.  With more thought
+                                   we could move this up higher and use
+                                   `protection_map' instead.  */
+                vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
+                        __pte(pgprot_val(vma->vm_page_prot)))));
+#endif
+        }
+
+        switch (map->type) {
+        case _DRM_AGP:
+          if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
+                /*
+                 * On some platforms we can't talk to bus dma address from the CPU, so for
+                 * memory of type DRM_AGP, we'll deal with sorting out the real physical
+                 * pages and mappings in nopage()
+                 */
+#if defined(__powerpc__)
+                pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
+#endif
+                vma->vm_ops = &drm_vm_ops;
+                break;
+          }
+                /* fall through to _DRM_FRAME_BUFFER... */        
+        case _DRM_FRAME_BUFFER:
+        case _DRM_REGISTERS:
+                if (VM_OFFSET(vma) >= __pa(high_memory)) {
+#if defined(__i386__) || defined(__x86_64__)
+                        if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
+                                pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
+                                pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
+                        }
+#elif defined(__powerpc__)
+                        pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
+#endif
+                        vma->vm_flags |= VM_IO; /* not in core dump */
+                }
+#if defined(__ia64__)
+                if (efi_range_is_wc(vma->vm_start, vma->vm_end -
+                                    vma->vm_start))
+                        vma->vm_page_prot =
+                                pgprot_writecombine(vma->vm_page_prot);
+                else
+                        vma->vm_page_prot =
+                                pgprot_noncached(vma->vm_page_prot);
+#endif
+                offset = dev->driver->get_reg_ofs(dev);
+#ifdef __sparc__
+                if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start,
+                                        (VM_OFFSET(vma) + offset) >> PAGE_SHIFT,
+                                        vma->vm_end - vma->vm_start,
+                                        vma->vm_page_prot))
+#else
+                if (io_remap_pfn_range(vma, vma->vm_start,
+                                     (VM_OFFSET(vma) + offset) >> PAGE_SHIFT,
+                                     vma->vm_end - vma->vm_start,
+                                     vma->vm_page_prot))
+#endif
+                                return -EAGAIN;
+                DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
+                          " offset = 0x%lx\n",
+                          map->type,
+                          vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset);
+                vma->vm_ops = &drm_vm_ops;
+                break;
+        case _DRM_SHM:
+                vma->vm_ops = &drm_vm_shm_ops;
+                vma->vm_private_data = (void *)map;
+                                /* Don't let this area swap.  Change when
+                                   DRM_KERNEL advisory is supported. */
+#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
+                vma->vm_flags |= VM_LOCKED;
+#else
+                vma->vm_flags |= VM_RESERVED;
+#endif
+                break;
+        case _DRM_SCATTER_GATHER:
+                vma->vm_ops = &drm_vm_sg_ops;
+                vma->vm_private_data = (void *)map;
+#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
+                vma->vm_flags |= VM_LOCKED;
+#else
+                vma->vm_flags |= VM_RESERVED;
+#endif
+                break;
+        default:
+                return -EINVAL; /* This should never happen. */
+        }
+#if LINUX_VERSION_CODE <= 0x02040e /* KERNEL_VERSION(2,4,14) */
+        vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
+#else
+        vma->vm_flags |= VM_RESERVED; /* Don't swap */
+#endif
+
+        vma->vm_file  =  filp;  /* Needed for drm_vm_open() */
+        drm_vm_open(vma);
+        return 0;
+}
+EXPORT_SYMBOL(drm_mmap);