/* * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. */ /** * \file drm_bufs.c * Generic buffer template * * \author Rickard E. (Rik) Faith * \author Gareth Hughes */ /* * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com * * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * Copyright (c) 2009, 2012, Intel Corporation. * 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" #include "drm_io32.h" #ifdef _LP64 extern caddr_t smmap64(caddr_t, size_t, int, int, int, off_t); #define drm_smmap smmap64 #elif defined(_SYSCALL32_IMPL) || defined(_ILP32) extern caddr_t smmap32(caddr32_t, size32_t, int, int, int, off32_t); #define drm_smmap smmap32 #else #error "No define for _LP64, _SYSCALL32_IMPL or _ILP32" #endif #define PAGE_MASK (~(PAGE_SIZE - 1)) #define round_page(x) (((x) + (PAGE_SIZE - 1)) & PAGE_MASK) static struct drm_map_list *drm_find_matching_map(struct drm_device *dev, struct drm_local_map *map) { struct drm_map_list *entry; list_for_each_entry(entry, struct drm_map_list, &dev->maplist, head) { /* * Because the kernel-userspace ABI is fixed at a 32-bit offset * while PCI resources may live above that, we ignore the map * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS. * It is assumed that each driver will have only one resource of * each type. */ if (!entry->map || map->type != entry->map->type || entry->master != dev->primary->master) continue; switch (map->type) { case _DRM_SHM: if (map->flags != _DRM_CONTAINS_LOCK) break; return entry; case _DRM_REGISTERS: case _DRM_FRAME_BUFFER: if ((entry->map->offset & 0xffffffff) == (map->offset & 0xffffffff)) return entry; default: /* Make gcc happy */ ; } if (entry->map->offset == map->offset) return entry; } return NULL; } int drm_map_handle(struct drm_device *dev, struct drm_map_list *list) { int newid, ret; ret = idr_get_new_above(&dev->map_idr, list, 1, &newid); if (ret < 0) return ret; list->user_token = newid << PAGE_SHIFT; return 0; } /** * Core function to create a range of memory available for mapping by a * non-root process. * * Adjusts the memory offset to its absolute value according to the mapping * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where * applicable and if supported by the kernel. */ static int drm_addmap_core(struct drm_device *dev, unsigned long offset, unsigned long size, enum drm_map_type type, enum drm_map_flags flags, struct drm_map_list ** maplist) { struct drm_local_map *map; struct drm_map_list *list; /* LINTED */ unsigned long user_token; int ret; map = kmalloc(sizeof(*map), GFP_KERNEL); if (!map) return -ENOMEM; map->offset = offset; map->size = size; map->flags = flags; map->type = type; /* Only allow shared memory to be removable since we only keep enough * book keeping information about shared memory to allow for removal * when processes fork. */ if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) { kfree(map, sizeof(*map)); return -EINVAL; } DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n", (unsigned long long)map->offset, map->size, map->type); /* page-align _DRM_SHM maps. They are allocated here so there is no security * hole created by that and it works around various broken drivers that use * a non-aligned quantity to map the SAREA. --BenH */ if (map->type == _DRM_SHM) map->size = PAGE_ALIGN(map->size); if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) { kfree(map, sizeof(*map)); return -EINVAL; } if (map->offset + map->size < map->offset) { kfree(map, sizeof(*map)); return -EINVAL; } map->mtrr = -1; map->handle = NULL; switch (map->type) { case _DRM_REGISTERS: case _DRM_FRAME_BUFFER: /* Some drivers preinitialize some maps, without the X Server * needing to be aware of it. Therefore, we just return success * when the server tries to create a duplicate map. */ list = drm_find_matching_map(dev, map); if (list != NULL) { if (list->map->size != map->size) { DRM_DEBUG("Matching maps of type %d with " "mismatched sizes, (%ld vs %ld)\n", map->type, map->size, list->map->size); list->map->size = map->size; } kfree(map, sizeof(struct drm_local_map)); *maplist = list; return 0; } if (map->type == _DRM_REGISTERS) { map->handle = ioremap(map->offset, map->size); if (!map->handle) { kfree(map, sizeof(struct drm_local_map)); return -ENOMEM; } } break; case _DRM_SHM: list = drm_find_matching_map(dev, map); if (list != NULL) { if(list->map->size != map->size) { DRM_DEBUG("Matching maps of type %d with " "mismatched sizes, (%ld vs %ld)\n", map->type, map->size, list->map->size); list->map->size = map->size; } kfree(map, sizeof(struct drm_local_map)); *maplist = list; return 0; } map->handle = ddi_umem_alloc(map->size, DDI_UMEM_NOSLEEP, &map->umem_cookie); DRM_DEBUG("%lu %p\n", map->size, map->handle); if (!map->handle) { kfree(map, sizeof(struct drm_local_map)); return -ENOMEM; } map->offset = (uintptr_t)map->handle; if (map->flags & _DRM_CONTAINS_LOCK) { /* Prevent a 2nd X Server from creating a 2nd lock */ if (dev->primary->master->lock.hw_lock != NULL) { ddi_umem_free(map->umem_cookie); kfree(map, sizeof(struct drm_local_map)); return -EBUSY; } dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */ } break; case _DRM_AGP: { caddr_t kvaddr; if (!drm_core_has_AGP(dev)) { kfree(map, sizeof(struct drm_local_map)); return -EINVAL; } map->offset += dev->agp->base; kvaddr = gfxp_alloc_kernel_space(map->size); if (!kvaddr) { DRM_ERROR("failed to alloc AGP aperture"); kfree(map, sizeof(struct drm_local_map)); return -EPERM; } gfxp_load_kernel_space(map->offset, map->size, GFXP_MEMORY_WRITECOMBINED, kvaddr); map->handle = (void *)(uintptr_t)kvaddr; map->umem_cookie = gfxp_umem_cookie_init(map->handle, map->size); if (!map->umem_cookie) { DRM_ERROR("gfxp_umem_cookie_init() failed"); gfxp_unmap_kernel_space(map->handle, map->size); kfree(map, sizeof(struct drm_local_map)); return (-ENOMEM); } break; } case _DRM_GEM: DRM_ERROR("tried to addmap GEM object\n"); break; case _DRM_SCATTER_GATHER: if (!dev->sg) { kfree(map, sizeof(struct drm_local_map)); return -EINVAL; } map->offset += (uintptr_t)dev->sg->virtual; map->handle = (void *)map->offset; map->umem_cookie = gfxp_umem_cookie_init(map->handle, map->size); if (!map->umem_cookie) { DRM_ERROR("gfxp_umem_cookie_init() failed"); kfree(map, sizeof(struct drm_local_map)); return (-ENOMEM); } break; case _DRM_CONSISTENT: DRM_ERROR("%d DRM_AGP_CONSISTENT", __LINE__); kfree(map, sizeof(struct drm_local_map)); return -ENOTSUP; default: kfree(map, sizeof(struct drm_local_map)); return -EINVAL; } list = kmalloc(sizeof(*list), GFP_KERNEL); if (!list) { if (map->type == _DRM_REGISTERS) iounmap(map->handle); kfree(map, sizeof(struct drm_local_map)); return -EINVAL; } (void) memset(list, 0, sizeof(*list)); list->map = map; mutex_lock(&dev->struct_mutex); list_add(&list->head, &dev->maplist, (caddr_t)list); /* Assign a 32-bit handle */ /* We do it here so that dev->struct_mutex protects the increment */ user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle : map->offset; ret = drm_map_handle(dev, list); if (ret) { if (map->type == _DRM_REGISTERS) iounmap(map->handle); kfree(map, sizeof(struct drm_local_map)); kfree(list, sizeof(struct drm_map_list)); mutex_unlock(&dev->struct_mutex); return ret; } mutex_unlock(&dev->struct_mutex); if (!(map->flags & _DRM_DRIVER)) list->master = dev->primary->master; *maplist = list; return 0; } int drm_addmap(struct drm_device *dev, unsigned long offset, unsigned long size, enum drm_map_type type, enum drm_map_flags flags, struct drm_local_map ** map_ptr) { struct drm_map_list *list; int rc; rc = drm_addmap_core(dev, offset, size, type, flags, &list); if (!rc) *map_ptr = list->map; return rc; } /** * Ioctl to specify a range of memory that is available for mapping by a * non-root process. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_map structure. * \return zero on success or a negative value on error. * */ /* LINTED */ int drm_addmap_ioctl(DRM_IOCTL_ARGS) { struct drm_map *map = data; struct drm_map_list *maplist; int err; if (!(DRM_SUSER(credp) || map->type == _DRM_AGP || map->type == _DRM_SHM)) return -EPERM; err = drm_addmap_core(dev, map->offset, map->size, map->type, map->flags, &maplist); if (err) return err; /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */ map->handle = maplist->user_token; return 0; } /** * Remove a map private from list and deallocate resources if the mapping * isn't in use. * * Searches the map on drm_device::maplist, removes it from the list, see if * its being used, and free any associate resource (such as MTRR's) if it's not * being on use. * * \sa drm_addmap */ int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map) { struct drm_map_list *r_list = NULL, *list_t; /* LINTED */ drm_dma_handle_t dmah; int found = 0; /* LINTED */ struct drm_master *master; /* Find the list entry for the map and remove it */ list_for_each_entry_safe(r_list, list_t, struct drm_map_list, &dev->maplist, head) { if (r_list->map == map) { master = r_list->master; list_del(&r_list->head); (void) idr_remove(&dev->map_idr, r_list->user_token >> PAGE_SHIFT); kfree(r_list, sizeof(struct drm_map_list)); found = 1; break; } } if (!found) return -EINVAL; switch (map->type) { case _DRM_REGISTERS: iounmap(map->handle); /* FALLTHROUGH */ case _DRM_FRAME_BUFFER: break; case _DRM_SHM: ddi_umem_free(map->umem_cookie); break; case _DRM_AGP: gfxp_umem_cookie_destroy(map->umem_cookie); gfxp_unmap_kernel_space(map->handle, map->size); break; case _DRM_SCATTER_GATHER: gfxp_umem_cookie_destroy(map->umem_cookie); break; case _DRM_CONSISTENT: break; case _DRM_GEM: DRM_ERROR("tried to rmmap GEM object\n"); break; } kfree(map, sizeof(struct drm_local_map)); return 0; } int drm_rmmap(struct drm_device *dev, struct drm_local_map *map) { int ret; mutex_lock(&dev->struct_mutex); ret = drm_rmmap_locked(dev, map); mutex_unlock(&dev->struct_mutex); return ret; } /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on * the last close of the device, and this is necessary for cleanup when things * exit uncleanly. Therefore, having userland manually remove mappings seems * like a pointless exercise since they're going away anyway. * * One use case might be after addmap is allowed for normal users for SHM and * gets used by drivers that the server doesn't need to care about. This seems * unlikely. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a struct drm_map structure. * \return zero on success or a negative value on error. */ /* LINTED */ int drm_rmmap_ioctl(DRM_IOCTL_ARGS) { struct drm_map *request = data; struct drm_local_map *map = NULL; struct drm_map_list *r_list; int ret; mutex_lock(&dev->struct_mutex); list_for_each_entry(r_list, struct drm_map_list, &dev->maplist, head) { if (r_list->map && r_list->user_token == (unsigned long)request->handle && r_list->map->flags & _DRM_REMOVABLE) { map = r_list->map; break; } } /* List has wrapped around to the head pointer, or its empty we didn't * find anything. */ if (list_empty(&dev->maplist) || !map) { mutex_unlock(&dev->struct_mutex); return -EINVAL; } /* Register and framebuffer maps are permanent */ if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) { mutex_unlock(&dev->struct_mutex); return 0; } ret = drm_rmmap_locked(dev, map); mutex_unlock(&dev->struct_mutex); return ret; } /** * Cleanup after an error on one of the addbufs() functions. * * \param dev DRM device. * \param entry buffer entry where the error occurred. * * Frees any pages and buffers associated with the given entry. */ /* LINTED */ static void drm_cleanup_buf_error(struct drm_device * dev, struct drm_buf_entry * entry) { int i; if (entry->seg_count) { for (i = 0; i < entry->seg_count; i++) { if (entry->seglist[i]) { DRM_ERROR( "drm_cleanup_buf_error: not implemented"); } } kfree(entry->seglist, entry->seg_count * sizeof (*entry->seglist)); entry->seg_count = 0; } if (entry->buf_count) { for (i = 0; i < entry->buf_count; i++) { if (entry->buflist[i].dev_private) { kfree(entry->buflist[i].dev_private, entry->buflist[i].dev_priv_size); } } kfree(entry->buflist, entry->buf_count * sizeof (*entry->buflist)); entry->buf_count = 0; } } /** * Add AGP buffers for DMA transfers. * * \param dev struct drm_device to which the buffers are to be added. * \param request pointer to a struct drm_buf_desc describing the request. * \return zero on success or a negative number on failure. * * After some sanity checks creates a drm_buf structure for each buffer and * reallocates the buffer list of the same size order to accommodate the new * buffers. */ /* LINTED */ int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request, cred_t *credp) { struct drm_device_dma *dma = dev->dma; struct drm_buf_entry *entry; struct drm_buf *buf; unsigned long offset; unsigned long agp_offset; int count; int order; int size; int alignment; int page_order; int total; int byte_count; int i; struct drm_buf **temp_buflist; if (!dma) return -EINVAL; count = request->count; order = drm_order(request->size); size = 1 << order; alignment = (request->flags & _DRM_PAGE_ALIGN) ? round_page(size) : size; page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; total = PAGE_SIZE << page_order; byte_count = 0; agp_offset = dev->agp->base + request->agp_start; DRM_DEBUG("count: %d\n", count); DRM_DEBUG("order: %d\n", order); DRM_DEBUG("size: %d\n", size); DRM_DEBUG("agp_offset: %lx\n", agp_offset); DRM_DEBUG("alignment: %d\n", alignment); DRM_DEBUG("page_order: %d\n", page_order); DRM_DEBUG("total: %d\n", total); if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL; spin_lock(&dev->count_lock); if (dev->buf_use) { spin_unlock(&dev->count_lock); return -EBUSY; } atomic_inc(&dev->buf_alloc); spin_unlock(&dev->count_lock); mutex_lock(&dev->struct_mutex); entry = &dma->bufs[order]; if (entry->buf_count) { mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; /* May only call once for each order */ } if (count < 0 || count > 4096) { mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -EINVAL; } entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL); if (!entry->buflist) { mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; } (void) memset(entry->buflist, 0, count * sizeof(*entry->buflist)); entry->buf_size = size; entry->page_order = page_order; offset = 0; while (entry->buf_count < count) { buf = &entry->buflist[entry->buf_count]; buf->idx = dma->buf_count + entry->buf_count; buf->total = alignment; buf->order = order; buf->used = 0; buf->offset = (dma->byte_count + offset); buf->bus_address = agp_offset + offset; buf->address = (void *)(agp_offset + offset); buf->next = NULL; buf->pending = 0; buf->file_priv = NULL; buf->dev_priv_size = dev->driver->buf_priv_size; buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL); if (!buf->dev_private) { /* Set count correctly so we free the proper amount. */ entry->buf_count = count; drm_cleanup_buf_error(dev, entry); mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; } (void) memset(buf->dev_private, 0, buf->dev_priv_size); DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); offset += alignment; entry->buf_count++; byte_count += PAGE_SIZE << page_order; } DRM_DEBUG("byte_count: %d\n", byte_count); temp_buflist = kmalloc( (dma->buf_count + entry->buf_count) * sizeof(*dma->buflist), GFP_KERNEL); if (!temp_buflist) { /* Free the entry because it isn't valid */ drm_cleanup_buf_error(dev, entry); mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; } bcopy(temp_buflist, dma->buflist, dma->buf_count * sizeof (*dma->buflist)); kmem_free(dma->buflist, dma->buf_count *sizeof (*dma->buflist)); dma->buflist = temp_buflist; for (i = 0; i < entry->buf_count; i++) { dma->buflist[i + dma->buf_count] = &entry->buflist[i]; } dma->buf_count += entry->buf_count; dma->seg_count += entry->seg_count; dma->page_count += byte_count >> PAGE_SHIFT; dma->byte_count += byte_count; DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); mutex_unlock(&dev->struct_mutex); request->count = entry->buf_count; request->size = size; dma->flags = _DRM_DMA_USE_AGP; atomic_dec(&dev->buf_alloc); return 0; } static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request, cred_t *credp) { struct drm_device_dma *dma = dev->dma; struct drm_buf_entry *entry; struct drm_buf *buf; unsigned long offset; unsigned long agp_offset; int count; int order; int size; int alignment; int page_order; int total; int byte_count; int i; struct drm_buf **temp_buflist; if (!drm_core_check_feature(dev, DRIVER_SG)) return -EINVAL; if (!dma) return -EINVAL; if (!DRM_SUSER(credp)) return -EPERM; count = request->count; order = drm_order(request->size); size = 1 << order; alignment = (request->flags & _DRM_PAGE_ALIGN) ? round_page(size) : size; page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0; total = PAGE_SIZE << page_order; byte_count = 0; agp_offset = request->agp_start; DRM_DEBUG("count: %d\n", count); DRM_DEBUG("order: %d\n", order); DRM_DEBUG("size: %d\n", size); DRM_DEBUG("agp_offset: %lu\n", agp_offset); DRM_DEBUG("alignment: %d\n", alignment); DRM_DEBUG("page_order: %d\n", page_order); DRM_DEBUG("total: %d\n", total); if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL; spin_lock(&dev->count_lock); if (dev->buf_use) { spin_unlock(&dev->count_lock); return -EBUSY; } atomic_inc(&dev->buf_alloc); spin_unlock(&dev->count_lock); mutex_lock(&dev->struct_mutex); entry = &dma->bufs[order]; if (entry->buf_count) { mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; /* May only call once for each order */ } if (count < 0 || count > 4096) { mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -EINVAL; } entry->buflist = kmalloc(count * sizeof(*entry->buflist), GFP_KERNEL); if (!entry->buflist) { mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; } (void) memset(entry->buflist, 0, count * sizeof(*entry->buflist)); entry->buf_size = size; entry->page_order = page_order; offset = 0; while (entry->buf_count < count) { buf = &entry->buflist[entry->buf_count]; buf->idx = dma->buf_count + entry->buf_count; buf->total = alignment; buf->order = order; buf->used = 0; buf->offset = (dma->byte_count + offset); buf->bus_address = agp_offset + offset; buf->address = (void *)(agp_offset + offset + dev->sg->handle); buf->next = NULL; buf->pending = 0; buf->file_priv = NULL; buf->dev_priv_size = dev->driver->buf_priv_size; buf->dev_private = kmalloc(buf->dev_priv_size, GFP_KERNEL); if (!buf->dev_private) { /* Set count correctly so we free the proper amount. */ entry->buf_count = count; drm_cleanup_buf_error(dev, entry); mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; } (void) memset(buf->dev_private, 0, buf->dev_priv_size); DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address); offset += alignment; entry->buf_count++; byte_count += PAGE_SIZE << page_order; } DRM_DEBUG("byte_count: %d\n", byte_count); temp_buflist = drm_realloc(dma->buflist, dma->buf_count * sizeof (*dma->buflist), (dma->buf_count + entry->buf_count) * sizeof (*dma->buflist), DRM_MEM_BUFS); if (!temp_buflist) { /* Free the entry because it isn't valid */ drm_cleanup_buf_error(dev, entry); mutex_unlock(&dev->struct_mutex); atomic_dec(&dev->buf_alloc); return -ENOMEM; } dma->buflist = temp_buflist; for (i = 0; i < entry->buf_count; i++) { dma->buflist[i + dma->buf_count] = &entry->buflist[i]; } dma->buf_count += entry->buf_count; dma->byte_count += byte_count; DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count); DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count); mutex_unlock(&dev->struct_mutex); request->count = entry->buf_count; request->size = size; dma->flags = _DRM_DMA_USE_SG; atomic_dec(&dev->buf_alloc); return 0; } /** * Add buffers for DMA transfers (ioctl). * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a struct drm_buf_desc request. * \return zero on success or a negative number on failure. * * According with the memory type specified in drm_buf_desc::flags and the * build options, it dispatches the call either to addbufs_agp(), * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent * PCI memory respectively. */ /* LINTED */ int drm_addbufs(DRM_IOCTL_ARGS) { struct drm_buf_desc *request = data; int ret = -EINVAL; if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) return -EINVAL; if (request->flags & _DRM_AGP_BUFFER) ret = drm_addbufs_agp(dev, request, credp); else if (request->flags & _DRM_SG_BUFFER) ret = drm_addbufs_sg(dev, request, credp); return ret; } /** * Get information about the buffer mappings. * * This was originally mean for debugging purposes, or by a sophisticated * client library to determine how best to use the available buffers (e.g., * large buffers can be used for image transfer). * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_buf_info structure. * \return zero on success or a negative number on failure. * * Increments drm_device::buf_use while holding the drm_device::count_lock * lock, preventing of allocating more buffers after this call. Information * about each requested buffer is then copied into user space. */ /* LINTED */ int drm_infobufs(DRM_IOCTL_ARGS) { struct drm_device_dma *dma = dev->dma; struct drm_buf_info *request = data; int i; int count; if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) return -EINVAL; if (!dma) return -EINVAL; spin_lock(&dev->count_lock); if (atomic_read(&dev->buf_alloc)) { spin_unlock(&dev->count_lock); return -EBUSY; } ++dev->buf_use; /* Can't allocate more after this call */ spin_unlock(&dev->count_lock); for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { if (dma->bufs[i].buf_count) ++count; } DRM_DEBUG("count = %d\n", count); if (request->count >= count) { for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) { if (dma->bufs[i].buf_count) { struct drm_buf_desc __user *to = &request->list[count]; struct drm_buf_entry *from = &dma->bufs[i]; struct drm_freelist *list = &dma->bufs[i].freelist; if (copy_to_user(&to->count, &from->buf_count, sizeof(from->buf_count)) || copy_to_user(&to->size, &from->buf_size, sizeof(from->buf_size)) || copy_to_user(&to->low_mark, &list->low_mark, sizeof(list->low_mark)) || copy_to_user(&to->high_mark, &list->high_mark, sizeof(list->high_mark))) return -EFAULT; DRM_DEBUG("%d %d %d %d %d\n", i, dma->bufs[i].buf_count, dma->bufs[i].buf_size, dma->bufs[i].freelist.low_mark, dma->bufs[i].freelist.high_mark); ++count; } } } request->count = count; return 0; } /** * Specifies a low and high water mark for buffer allocation * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg a pointer to a drm_buf_desc structure. * \return zero on success or a negative number on failure. * * Verifies that the size order is bounded between the admissible orders and * updates the respective drm_device_dma::bufs entry low and high water mark. * * \note This ioctl is deprecated and mostly never used. */ /* LINTED */ int drm_markbufs(DRM_IOCTL_ARGS) { struct drm_device_dma *dma = dev->dma; struct drm_buf_desc *request = data; int order; struct drm_buf_entry *entry; if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) return -EINVAL; if (!dma) return -EINVAL; DRM_DEBUG("%d, %d, %d\n", request->size, request->low_mark, request->high_mark); order = drm_order(request->size); if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER) return -EINVAL; entry = &dma->bufs[order]; if (request->low_mark < 0 || request->low_mark > entry->buf_count) return -EINVAL; if (request->high_mark < 0 || request->high_mark > entry->buf_count) return -EINVAL; entry->freelist.low_mark = request->low_mark; entry->freelist.high_mark = request->high_mark; return 0; } /** * Unreserve the buffers in list, previously reserved using drmDMA. * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_buf_free structure. * \return zero on success or a negative number on failure. * * Calls free_buffer() for each used buffer. * This function is primarily used for debugging. */ /* LINTED */ int drm_freebufs(DRM_IOCTL_ARGS) { struct drm_device_dma *dma = dev->dma; struct drm_buf_free *request = data; int i; int idx; struct drm_buf *buf; if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) return -EINVAL; if (!dma) return -EINVAL; DRM_DEBUG("%d\n", request->count); for (i = 0; i < request->count; i++) { if (DRM_COPY_FROM_USER(&idx, &request->list[i], sizeof (idx))) return -EFAULT; if (idx < 0 || idx >= dma->buf_count) { DRM_ERROR("Index %d (of %d max)\n", idx, dma->buf_count - 1); return -EINVAL; } buf = dma->buflist[idx]; if (buf->file_priv != file) { DRM_ERROR("Process %d freeing buffer not owned\n", DRM_CURRENTPID); return -EINVAL; } drm_free_buffer(dev, buf); } return 0; } /** * Maps all of the DMA buffers into client-virtual space (ioctl). * * \param inode device inode. * \param file_priv DRM file private. * \param cmd command. * \param arg pointer to a drm_buf_map structure. * \return zero on success or a negative number on failure. * * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information * about each buffer into user space. For PCI buffers, it calls do_mmap() with * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls * drm_mmap_dma(). */ /* LINTED */ int drm_mapbufs(DRM_IOCTL_ARGS) { struct drm_device_dma *dma = dev->dma; int retcode = 0; const int zero = 0; unsigned long virtual; unsigned long address; struct drm_buf_map *request = data; int i; uint_t size, foff; #ifdef _MULTI_DATAMODEL struct drm_buf_pub_32 *list32; uint_t address32; #endif if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA)) return -EINVAL; if (!dma) return -EINVAL; spin_lock(&dev->count_lock); if (atomic_read(&dev->buf_alloc)) { spin_unlock(&dev->count_lock); return -EBUSY; } dev->buf_use++; /* Can't allocate more after this call */ spin_unlock(&dev->count_lock); if (request->count >= dma->buf_count) { if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP)) || (drm_core_check_feature(dev, DRIVER_SG) && (dma->flags & _DRM_DMA_USE_SG))) { struct drm_local_map *map = dev->agp_buffer_map; if (!map) { retcode = -EINVAL; goto done; } size = round_page(map->size); foff = (uintptr_t)map->handle; } else { size = round_page(dma->byte_count); foff = 0; } request->virtual = drm_smmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, request->fd, foff); if (request->virtual == NULL) { DRM_ERROR("request->virtual is NULL"); retcode = -EINVAL; goto done; } virtual = (unsigned long) request->virtual; #ifdef _MULTI_DATAMODEL if (ddi_model_convert_from(ioctl_mode & FMODELS) == DDI_MODEL_ILP32) { list32 = (drm_buf_pub_32_t *)(uintptr_t)request->list; for (i = 0; i < dma->buf_count; i++) { if (DRM_COPY_TO_USER(&list32[i].idx, &dma->buflist[i]->idx, sizeof (list32[0].idx))) { retcode = -EFAULT; goto done; } if (DRM_COPY_TO_USER(&list32[i].total, &dma->buflist[i]->total, sizeof (list32[0].total))) { retcode = -EFAULT; goto done; } if (DRM_COPY_TO_USER(&list32[i].used, &zero, sizeof (zero))) { retcode = -EFAULT; goto done; } address32 = virtual + dma->buflist[i]->offset; /* *** */ if (DRM_COPY_TO_USER(&list32[i].address, &address32, sizeof (list32[0].address))) { retcode = -EFAULT; goto done; } } } else { #endif for (i = 0; i < dma->buf_count; i++) { if (DRM_COPY_TO_USER(&request->list[i].idx, &dma->buflist[i]->idx, sizeof (request->list[0].idx))) { retcode = -EFAULT; goto done; } if (DRM_COPY_TO_USER(&request->list[i].total, &dma->buflist[i]->total, sizeof (request->list[0].total))) { retcode = -EFAULT; goto done; } if (DRM_COPY_TO_USER(&request->list[i].used, &zero, sizeof (zero))) { retcode = -EFAULT; goto done; } address = virtual + dma->buflist[i]->offset; /* *** */ if (DRM_COPY_TO_USER(&request->list[i].address, &address, sizeof (address))) { retcode = -EFAULT; goto done; } } #ifdef _MULTI_DATAMODEL } #endif } done: request->count = dma->buf_count; DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode); return retcode; } /** * Compute size order. Returns the exponent of the smaller power of two which * is greater or equal to given number. * * \param size size. * \return order. * * \todo Can be made faster. */ int drm_order(unsigned long size) { int order; unsigned long tmp; for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ; if (size & (size - 1)) ++order; return order; }