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committed ca79b0c211ax
/* * AGPGART driver backend routines. * Copyright (C) 2004 Silicon Graphics, Inc. * Copyright (C) 2002-2003 Dave Jones. * Copyright (C) 1999 Jeff Hartmann. * Copyright (C) 1999 Precision Insight, Inc. * Copyright (C) 1999 Xi Graphics, Inc. * * 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 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 * JEFF HARTMANN, DAVE JONES, OR ANY OTHER CONTRIBUTORS 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. * * TODO: * - Allocate more than order 0 pages to avoid too much linear map splitting. *//* Due to XFree86 brain-damage, we can't go to 1.0 until they * fix some real stupidity. It's only by chance we can bump * past 0.99 at all due to some boolean logic error. */static const struct agp_version agp_current_version ={ .major = AGPGART_VERSION_MAJOR, .minor = AGPGART_VERSION_MINOR,};struct agp_bridge_data *(*agp_find_bridge)(struct pci_dev *) = &agp_generic_find_bridge;struct agp_bridge_data *agp_bridge;LIST_HEAD(agp_bridges);EXPORT_SYMBOL(agp_bridge);EXPORT_SYMBOL(agp_bridges);EXPORT_SYMBOL(agp_find_bridge);/** * agp_backend_acquire - attempt to acquire an agp backend. * */struct agp_bridge_data *agp_backend_acquire(struct pci_dev *pdev){ struct agp_bridge_data *bridge; bridge = agp_find_bridge(pdev); if (!bridge) return NULL; if (atomic_read(&bridge->agp_in_use)) return NULL; atomic_inc(&bridge->agp_in_use); return bridge;}EXPORT_SYMBOL(agp_backend_acquire);/** * agp_backend_release - release the lock on the agp backend. * * The caller must insure that the graphics aperture translation table * is read for use by another entity. * * (Ensure that all memory it bound is unbound.) */void agp_backend_release(struct agp_bridge_data *bridge)