From 3ad8db2071d30c198403e605f2726fc5c3e46bfd Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Mon, 28 Apr 2008 16:54:53 -0700 Subject: Rename drm_mm.c and its fuctions to drm_memrange. It's not really a graphics memory allocator, just something to track ranges of address space. It doesn't involve actual allocation, and was consuming some desired namespace. --- linux-core/drm_mm.c | 296 ---------------------------------------------------- 1 file changed, 296 deletions(-) delete mode 100644 linux-core/drm_mm.c (limited to 'linux-core/drm_mm.c') diff --git a/linux-core/drm_mm.c b/linux-core/drm_mm.c deleted file mode 100644 index 59110293..00000000 --- a/linux-core/drm_mm.c +++ /dev/null @@ -1,296 +0,0 @@ -/************************************************************************** - * - * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA. - * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL - * THE COPYRIGHT HOLDERS, AUTHORS 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. - * - * - **************************************************************************/ - -/* - * Generic simple memory manager implementation. Intended to be used as a base - * class implementation for more advanced memory managers. - * - * Note that the algorithm used is quite simple and there might be substantial - * performance gains if a smarter free list is implemented. Currently it is just an - * unordered stack of free regions. This could easily be improved if an RB-tree - * is used instead. At least if we expect heavy fragmentation. - * - * Aligned allocations can also see improvement. - * - * Authors: - * Thomas Hellström - */ - -#include "drmP.h" -#include - -unsigned long drm_mm_tail_space(struct drm_mm *mm) -{ - struct list_head *tail_node; - struct drm_mm_node *entry; - - tail_node = mm->ml_entry.prev; - entry = list_entry(tail_node, struct drm_mm_node, ml_entry); - if (!entry->free) - return 0; - - return entry->size; -} - -int drm_mm_remove_space_from_tail(struct drm_mm *mm, unsigned long size) -{ - struct list_head *tail_node; - struct drm_mm_node *entry; - - tail_node = mm->ml_entry.prev; - entry = list_entry(tail_node, struct drm_mm_node, ml_entry); - if (!entry->free) - return -ENOMEM; - - if (entry->size <= size) - return -ENOMEM; - - entry->size -= size; - return 0; -} - - -static int drm_mm_create_tail_node(struct drm_mm *mm, - unsigned long start, - unsigned long size) -{ - struct drm_mm_node *child; - - child = (struct drm_mm_node *) - drm_ctl_alloc(sizeof(*child), DRM_MEM_MM); - if (!child) - return -ENOMEM; - - child->free = 1; - child->size = size; - child->start = start; - child->mm = mm; - - list_add_tail(&child->ml_entry, &mm->ml_entry); - list_add_tail(&child->fl_entry, &mm->fl_entry); - - return 0; -} - - -int drm_mm_add_space_to_tail(struct drm_mm *mm, unsigned long size) -{ - struct list_head *tail_node; - struct drm_mm_node *entry; - - tail_node = mm->ml_entry.prev; - entry = list_entry(tail_node, struct drm_mm_node, ml_entry); - if (!entry->free) { - return drm_mm_create_tail_node(mm, entry->start + entry->size, size); - } - entry->size += size; - return 0; -} - -static struct drm_mm_node *drm_mm_split_at_start(struct drm_mm_node *parent, - unsigned long size) -{ - struct drm_mm_node *child; - - child = (struct drm_mm_node *) - drm_ctl_alloc(sizeof(*child), DRM_MEM_MM); - if (!child) - return NULL; - - INIT_LIST_HEAD(&child->fl_entry); - - child->free = 0; - child->size = size; - child->start = parent->start; - child->mm = parent->mm; - - list_add_tail(&child->ml_entry, &parent->ml_entry); - INIT_LIST_HEAD(&child->fl_entry); - - parent->size -= size; - parent->start += size; - return child; -} - -struct drm_mm_node *drm_mm_get_block(struct drm_mm_node * parent, - unsigned long size, unsigned alignment) -{ - - struct drm_mm_node *align_splitoff = NULL; - struct drm_mm_node *child; - unsigned tmp = 0; - - if (alignment) - tmp = parent->start % alignment; - - if (tmp) { - align_splitoff = drm_mm_split_at_start(parent, alignment - tmp); - if (!align_splitoff) - return NULL; - } - - if (parent->size == size) { - list_del_init(&parent->fl_entry); - parent->free = 0; - return parent; - } else { - child = drm_mm_split_at_start(parent, size); - } - - if (align_splitoff) - drm_mm_put_block(align_splitoff); - - return child; -} - -/* - * Put a block. Merge with the previous and / or next block if they are free. - * Otherwise add to the free stack. - */ - -void drm_mm_put_block(struct drm_mm_node * cur) -{ - - struct drm_mm *mm = cur->mm; - struct list_head *cur_head = &cur->ml_entry; - struct list_head *root_head = &mm->ml_entry; - struct drm_mm_node *prev_node = NULL; - struct drm_mm_node *next_node; - - int merged = 0; - - if (cur_head->prev != root_head) { - prev_node = list_entry(cur_head->prev, struct drm_mm_node, ml_entry); - if (prev_node->free) { - prev_node->size += cur->size; - merged = 1; - } - } - if (cur_head->next != root_head) { - next_node = list_entry(cur_head->next, struct drm_mm_node, ml_entry); - if (next_node->free) { - if (merged) { - prev_node->size += next_node->size; - list_del(&next_node->ml_entry); - list_del(&next_node->fl_entry); - drm_ctl_free(next_node, sizeof(*next_node), - DRM_MEM_MM); - } else { - next_node->size += cur->size; - next_node->start = cur->start; - merged = 1; - } - } - } - if (!merged) { - cur->free = 1; - list_add(&cur->fl_entry, &mm->fl_entry); - } else { - list_del(&cur->ml_entry); - drm_ctl_free(cur, sizeof(*cur), DRM_MEM_MM); - } -} -EXPORT_SYMBOL(drm_mm_put_block); - -struct drm_mm_node *drm_mm_search_free(const struct drm_mm * mm, - unsigned long size, - unsigned alignment, int best_match) -{ - struct list_head *list; - const struct list_head *free_stack = &mm->fl_entry; - struct drm_mm_node *entry; - struct drm_mm_node *best; - unsigned long best_size; - unsigned wasted; - - best = NULL; - best_size = ~0UL; - - list_for_each(list, free_stack) { - entry = list_entry(list, struct drm_mm_node, fl_entry); - wasted = 0; - - if (entry->size < size) - continue; - - if (alignment) { - register unsigned tmp = entry->start % alignment; - if (tmp) - wasted += alignment - tmp; - } - - - if (entry->size >= size + wasted) { - if (!best_match) - return entry; - if (size < best_size) { - best = entry; - best_size = entry->size; - } - } - } - - return best; -} - -int drm_mm_clean(struct drm_mm * mm) -{ - struct list_head *head = &mm->ml_entry; - - return (head->next->next == head); -} - -int drm_mm_init(struct drm_mm * mm, unsigned long start, unsigned long size) -{ - INIT_LIST_HEAD(&mm->ml_entry); - INIT_LIST_HEAD(&mm->fl_entry); - - return drm_mm_create_tail_node(mm, start, size); -} - -EXPORT_SYMBOL(drm_mm_init); - -void drm_mm_takedown(struct drm_mm * mm) -{ - struct list_head *bnode = mm->fl_entry.next; - struct drm_mm_node *entry; - - entry = list_entry(bnode, struct drm_mm_node, fl_entry); - - if (entry->ml_entry.next != &mm->ml_entry || - entry->fl_entry.next != &mm->fl_entry) { - DRM_ERROR("Memory manager not clean. Delaying takedown\n"); - return; - } - - list_del(&entry->fl_entry); - list_del(&entry->ml_entry); - drm_ctl_free(entry, sizeof(*entry), DRM_MEM_MM); -} - -EXPORT_SYMBOL(drm_mm_takedown); -- cgit v1.2.3 From dabd056bf34b389585b618cf03a297877505f06b Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Tue, 29 Apr 2008 13:30:44 -0700 Subject: Move mmfs ioctls into the DRM. Untested. --- linux-core/drm_mm.c | 359 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 359 insertions(+) create mode 100644 linux-core/drm_mm.c (limited to 'linux-core/drm_mm.c') diff --git a/linux-core/drm_mm.c b/linux-core/drm_mm.c new file mode 100644 index 00000000..7e9fe39c --- /dev/null +++ b/linux-core/drm_mm.c @@ -0,0 +1,359 @@ +/* + * Copyright © 2008 Intel Corporation + * + * 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 + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + * + * Authors: + * Eric Anholt + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "drmP.h" + +/** @file drm_mm.c + * + * This file provides some of the base ioctls and library routines for + * the graphics memory manager implemented by each device driver. + * + * Because various devices have different requirements in terms of + * synchronization and migration strategies, implementing that is left up to + * the driver, and all that the general API provides should be generic -- + * allocating objects, reading/writing data with the cpu, freeing objects. + * Even there, platform-dependent optimizations for reading/writing data with + * the CPU mean we'll likely hook those out to driver-specific calls. However, + * the DRI2 implementation wants to have at least allocate/mmap be generic. + * + * The goal was to have swap-backed object allocation managed through + * struct file. However, file descriptors as handles to a struct file have + * two major failings: + * - Process limits prevent more than 1024 or so being used at a time by + * default. + * - Inability to allocate high fds will aggravate the X Server's select() + * handling, and likely that of many GL client applications as well. + * + * This led to a plan of using our own integer IDs (called handles, following + * DRM terminology) to mimic fds, and implement the fd syscalls we need as + * ioctls. The objects themselves will still include the struct file so + * that we can transition to fds if the required kernel infrastructure shows + * up at a later data, and as our interface with shmfs for memory allocation. + */ + +static struct drm_mm_object * +drm_mm_object_alloc(size_t size) +{ + struct drm_mm_object *obj; + + BUG_ON((size & (PAGE_SIZE - 1)) != 0); + + obj = kcalloc(1, sizeof(*obj), GFP_KERNEL); + + obj->filp = shmem_file_setup("drm mm object", size, 0); + if (IS_ERR(obj->filp)) { + kfree(obj); + return NULL; + } + + obj->refcount = 1; + + return obj; +} + +/** + * Removes the mapping from handle to filp for this object. + */ +static int +drm_mm_handle_delete(struct drm_file *filp, int handle) +{ + struct drm_mm_object *obj; + + /* This is gross. The idr system doesn't let us try a delete and + * return an error code. It just spews if you fail at deleting. + * So, we have to grab a lock around finding the object and then + * doing the delete on it and dropping the refcount, or the user + * could race us to double-decrement the refcount and cause a + * use-after-free later. Given the frequency of our handle lookups, + * we may want to use ida for number allocation and a hash table + * for the pointers, anyway. + */ + spin_lock(&filp->table_lock); + + /* Check if we currently have a reference on the object */ + obj = idr_find(&filp->object_idr, handle); + if (obj == NULL) { + spin_unlock(&filp->table_lock); + return -EINVAL; + } + + /* Release reference and decrement refcount. */ + idr_remove(&filp->object_idr, handle); + drm_mm_object_unreference(obj); + + spin_unlock(&filp->table_lock); + + return 0; +} + +/** Returns a reference to the object named by the handle. */ +static struct drm_mm_object * +drm_mm_object_lookup(struct drm_file *filp, int handle) +{ + struct drm_mm_object *obj; + + spin_lock(&filp->table_lock); + + /* Check if we currently have a reference on the object */ + obj = idr_find(&filp->object_idr, handle); + if (obj == NULL) { + spin_unlock(&filp->table_lock); + return NULL; + } + + drm_mm_object_reference(obj); + + spin_unlock(&filp->table_lock); + + return obj; +} + + +/** + * Allocates a new mm object and returns a handle to it. + */ +int +drm_mm_alloc_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_mm_alloc_args *args = data; + struct drm_mm_object *obj; + int handle, ret; + + /* Round requested size up to page size */ + args->size = (args->size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); + + /* Allocate the new object */ + obj = drm_mm_object_alloc(args->size); + if (obj == NULL) + return -ENOMEM; + + /* Get the user-visible handle using idr. + * + * I'm not really sure why the idr api needs us to do this in two + * repeating steps. It handles internal locking of its data + * structure, yet insists that we keep its memory allocation step + * separate from its slot-finding step for locking purposes. + */ + do { + if (idr_pre_get(&file_priv->object_idr, GFP_KERNEL) == 0) { + kfree(obj); + return -EFAULT; + } + + ret = idr_get_new(&file_priv->object_idr, obj, &handle); + } while (ret == -EAGAIN); + + if (ret != 0) { + drm_mm_object_unreference(obj); + return -EFAULT; + } + + args->handle = handle; + + return 0; +} + +/** + * Releases the handle to an mm object. + */ +int +drm_mm_unreference_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_mm_unreference_args *args = data; + int ret; + + ret = drm_mm_handle_delete(file_priv, args->handle); + + return ret; +} + +/** + * Reads data from the object referenced by handle. + * + * On error, the contents of *data are undefined. + */ +int +drm_mm_pread_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_mm_pread_args *args = data; + struct drm_mm_object *obj; + ssize_t read; + loff_t offset; + + obj = drm_mm_object_lookup(file_priv, args->handle); + if (obj == NULL) + return -EINVAL; + + offset = args->offset; + + read = obj->filp->f_op->read(obj->filp, (char __user *)args->data, + args->size, &offset); + if (read != args->size) { + drm_mm_object_unreference(obj); + if (read < 0) + return read; + else + return -EINVAL; + } + + drm_mm_object_unreference(obj); + + return 0; +} + +/** + * Maps the contents of an object, returning the address it is mapped + * into. + * + * While the mapping holds a reference on the contents of the object, it doesn't + * imply a ref on the object itself. + */ +int +drm_mm_mmap_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_mm_mmap_args *args = data; + struct drm_mm_object *obj; + loff_t offset; + + obj = drm_mm_object_lookup(file_priv, args->handle); + if (obj == NULL) + return -EINVAL; + + offset = args->offset; + + down_write(¤t->mm->mmap_sem); + args->addr = (void *)do_mmap(obj->filp, 0, args->size, + PROT_READ | PROT_WRITE, MAP_SHARED, + args->offset); + up_write(¤t->mm->mmap_sem); + + drm_mm_object_unreference(obj); + + return 0; +} + +/** + * Writes data to the object referenced by handle. + * + * On error, the contents of the buffer that were to be modified are undefined. + */ +int +drm_mm_pwrite_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_mm_pwrite_args *args = data; + struct drm_mm_object *obj; + ssize_t written; + loff_t offset; + + obj = drm_mm_object_lookup(file_priv, args->handle); + if (obj == NULL) + return -EINVAL; + + offset = args->offset; + + written = obj->filp->f_op->write(obj->filp, (char __user *)args->data, + args->size, &offset); + if (written != args->size) { + drm_mm_object_unreference(obj); + if (written < 0) + return written; + else + return -EINVAL; + } + + drm_mm_object_unreference(obj); + + return 0; +} + +/** + * Called at device open time, sets up the structure for handling refcounting + * of mm objects. + */ +void +drm_mm_open(struct drm_file *file_private) +{ + idr_init(&file_private->object_idr); +} + +/** Called at device close to release the file's references on objects. */ +static int +drm_mm_object_release(int id, void *ptr, void *data) +{ + struct drm_mm_object *obj = ptr; + + drm_mm_object_unreference(obj); + + return 0; +} + +/** + * Called at close time when the filp is going away. + * + * Releases any remaining references on objects by this filp. + */ +void +drm_mm_release(struct drm_file *file_private) +{ + idr_for_each(&file_private->object_idr, &drm_mm_object_release, NULL); + + idr_destroy(&file_private->object_idr); +} + +void +drm_mm_object_reference(struct drm_mm_object *obj) +{ + spin_lock(&obj->lock); + obj->refcount++; + spin_unlock(&obj->lock); +} + +void +drm_mm_object_unreference(struct drm_mm_object *obj) +{ + spin_lock(&obj->lock); + obj->refcount--; + spin_unlock(&obj->lock); + if (obj->refcount == 0) { + fput(obj->filp); + kfree(obj); + } +} -- cgit v1.2.3 From 2140e102f942edf7982cee2a3f00caf234551687 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Thu, 1 May 2008 11:39:06 -0700 Subject: checkpoint: rename to GEM and a few more i915 bits. --- linux-core/drm_mm.c | 359 ---------------------------------------------------- 1 file changed, 359 deletions(-) delete mode 100644 linux-core/drm_mm.c (limited to 'linux-core/drm_mm.c') diff --git a/linux-core/drm_mm.c b/linux-core/drm_mm.c deleted file mode 100644 index 7e9fe39c..00000000 --- a/linux-core/drm_mm.c +++ /dev/null @@ -1,359 +0,0 @@ -/* - * Copyright © 2008 Intel Corporation - * - * 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 - * THE AUTHORS OR COPYRIGHT HOLDERS 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. - * - * Authors: - * Eric Anholt - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "drmP.h" - -/** @file drm_mm.c - * - * This file provides some of the base ioctls and library routines for - * the graphics memory manager implemented by each device driver. - * - * Because various devices have different requirements in terms of - * synchronization and migration strategies, implementing that is left up to - * the driver, and all that the general API provides should be generic -- - * allocating objects, reading/writing data with the cpu, freeing objects. - * Even there, platform-dependent optimizations for reading/writing data with - * the CPU mean we'll likely hook those out to driver-specific calls. However, - * the DRI2 implementation wants to have at least allocate/mmap be generic. - * - * The goal was to have swap-backed object allocation managed through - * struct file. However, file descriptors as handles to a struct file have - * two major failings: - * - Process limits prevent more than 1024 or so being used at a time by - * default. - * - Inability to allocate high fds will aggravate the X Server's select() - * handling, and likely that of many GL client applications as well. - * - * This led to a plan of using our own integer IDs (called handles, following - * DRM terminology) to mimic fds, and implement the fd syscalls we need as - * ioctls. The objects themselves will still include the struct file so - * that we can transition to fds if the required kernel infrastructure shows - * up at a later data, and as our interface with shmfs for memory allocation. - */ - -static struct drm_mm_object * -drm_mm_object_alloc(size_t size) -{ - struct drm_mm_object *obj; - - BUG_ON((size & (PAGE_SIZE - 1)) != 0); - - obj = kcalloc(1, sizeof(*obj), GFP_KERNEL); - - obj->filp = shmem_file_setup("drm mm object", size, 0); - if (IS_ERR(obj->filp)) { - kfree(obj); - return NULL; - } - - obj->refcount = 1; - - return obj; -} - -/** - * Removes the mapping from handle to filp for this object. - */ -static int -drm_mm_handle_delete(struct drm_file *filp, int handle) -{ - struct drm_mm_object *obj; - - /* This is gross. The idr system doesn't let us try a delete and - * return an error code. It just spews if you fail at deleting. - * So, we have to grab a lock around finding the object and then - * doing the delete on it and dropping the refcount, or the user - * could race us to double-decrement the refcount and cause a - * use-after-free later. Given the frequency of our handle lookups, - * we may want to use ida for number allocation and a hash table - * for the pointers, anyway. - */ - spin_lock(&filp->table_lock); - - /* Check if we currently have a reference on the object */ - obj = idr_find(&filp->object_idr, handle); - if (obj == NULL) { - spin_unlock(&filp->table_lock); - return -EINVAL; - } - - /* Release reference and decrement refcount. */ - idr_remove(&filp->object_idr, handle); - drm_mm_object_unreference(obj); - - spin_unlock(&filp->table_lock); - - return 0; -} - -/** Returns a reference to the object named by the handle. */ -static struct drm_mm_object * -drm_mm_object_lookup(struct drm_file *filp, int handle) -{ - struct drm_mm_object *obj; - - spin_lock(&filp->table_lock); - - /* Check if we currently have a reference on the object */ - obj = idr_find(&filp->object_idr, handle); - if (obj == NULL) { - spin_unlock(&filp->table_lock); - return NULL; - } - - drm_mm_object_reference(obj); - - spin_unlock(&filp->table_lock); - - return obj; -} - - -/** - * Allocates a new mm object and returns a handle to it. - */ -int -drm_mm_alloc_ioctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_mm_alloc_args *args = data; - struct drm_mm_object *obj; - int handle, ret; - - /* Round requested size up to page size */ - args->size = (args->size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); - - /* Allocate the new object */ - obj = drm_mm_object_alloc(args->size); - if (obj == NULL) - return -ENOMEM; - - /* Get the user-visible handle using idr. - * - * I'm not really sure why the idr api needs us to do this in two - * repeating steps. It handles internal locking of its data - * structure, yet insists that we keep its memory allocation step - * separate from its slot-finding step for locking purposes. - */ - do { - if (idr_pre_get(&file_priv->object_idr, GFP_KERNEL) == 0) { - kfree(obj); - return -EFAULT; - } - - ret = idr_get_new(&file_priv->object_idr, obj, &handle); - } while (ret == -EAGAIN); - - if (ret != 0) { - drm_mm_object_unreference(obj); - return -EFAULT; - } - - args->handle = handle; - - return 0; -} - -/** - * Releases the handle to an mm object. - */ -int -drm_mm_unreference_ioctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_mm_unreference_args *args = data; - int ret; - - ret = drm_mm_handle_delete(file_priv, args->handle); - - return ret; -} - -/** - * Reads data from the object referenced by handle. - * - * On error, the contents of *data are undefined. - */ -int -drm_mm_pread_ioctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_mm_pread_args *args = data; - struct drm_mm_object *obj; - ssize_t read; - loff_t offset; - - obj = drm_mm_object_lookup(file_priv, args->handle); - if (obj == NULL) - return -EINVAL; - - offset = args->offset; - - read = obj->filp->f_op->read(obj->filp, (char __user *)args->data, - args->size, &offset); - if (read != args->size) { - drm_mm_object_unreference(obj); - if (read < 0) - return read; - else - return -EINVAL; - } - - drm_mm_object_unreference(obj); - - return 0; -} - -/** - * Maps the contents of an object, returning the address it is mapped - * into. - * - * While the mapping holds a reference on the contents of the object, it doesn't - * imply a ref on the object itself. - */ -int -drm_mm_mmap_ioctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_mm_mmap_args *args = data; - struct drm_mm_object *obj; - loff_t offset; - - obj = drm_mm_object_lookup(file_priv, args->handle); - if (obj == NULL) - return -EINVAL; - - offset = args->offset; - - down_write(¤t->mm->mmap_sem); - args->addr = (void *)do_mmap(obj->filp, 0, args->size, - PROT_READ | PROT_WRITE, MAP_SHARED, - args->offset); - up_write(¤t->mm->mmap_sem); - - drm_mm_object_unreference(obj); - - return 0; -} - -/** - * Writes data to the object referenced by handle. - * - * On error, the contents of the buffer that were to be modified are undefined. - */ -int -drm_mm_pwrite_ioctl(struct drm_device *dev, void *data, - struct drm_file *file_priv) -{ - struct drm_mm_pwrite_args *args = data; - struct drm_mm_object *obj; - ssize_t written; - loff_t offset; - - obj = drm_mm_object_lookup(file_priv, args->handle); - if (obj == NULL) - return -EINVAL; - - offset = args->offset; - - written = obj->filp->f_op->write(obj->filp, (char __user *)args->data, - args->size, &offset); - if (written != args->size) { - drm_mm_object_unreference(obj); - if (written < 0) - return written; - else - return -EINVAL; - } - - drm_mm_object_unreference(obj); - - return 0; -} - -/** - * Called at device open time, sets up the structure for handling refcounting - * of mm objects. - */ -void -drm_mm_open(struct drm_file *file_private) -{ - idr_init(&file_private->object_idr); -} - -/** Called at device close to release the file's references on objects. */ -static int -drm_mm_object_release(int id, void *ptr, void *data) -{ - struct drm_mm_object *obj = ptr; - - drm_mm_object_unreference(obj); - - return 0; -} - -/** - * Called at close time when the filp is going away. - * - * Releases any remaining references on objects by this filp. - */ -void -drm_mm_release(struct drm_file *file_private) -{ - idr_for_each(&file_private->object_idr, &drm_mm_object_release, NULL); - - idr_destroy(&file_private->object_idr); -} - -void -drm_mm_object_reference(struct drm_mm_object *obj) -{ - spin_lock(&obj->lock); - obj->refcount++; - spin_unlock(&obj->lock); -} - -void -drm_mm_object_unreference(struct drm_mm_object *obj) -{ - spin_lock(&obj->lock); - obj->refcount--; - spin_unlock(&obj->lock); - if (obj->refcount == 0) { - fput(obj->filp); - kfree(obj); - } -} -- cgit v1.2.3