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