drm_pci.c revision 1450
1185N/A * Copyright (c) 2006, 2015, Oracle and/or its affiliates. All rights reserved. 1185N/A * \brief PCI consistent, DMA-accessible memory functions. 1185N/A * \author Eric Anholt <anholt@FreeBSD.org> 1185N/A * Copyright 2003 Eric Anholt. 1185N/A * Permission is hereby granted, free of charge, to any person obtaining a 1185N/A * copy of this software and associated documentation files (the "Software"), 1185N/A * to deal in the Software without restriction, including without limitation 1220N/A * the rights to use, copy, modify, merge, publish, distribute, sublicense, 1185N/A * and/or sell copies of the Software, and to permit persons to whom the 1185N/A * Software is furnished to do so, subject to the following conditions: 1185N/A * The above copyright notice and this permission notice (including the next 1185N/A * paragraph) shall be included in all copies or substantial portions of the 1185N/A * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1185N/A * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1185N/A * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 1185N/A * AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 1185N/A * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 1185N/A * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 1185N/A/**********************************************************************/ 1185N/A * During AGP mapping initialization, we map AGP aperture 1185N/A * into kernel space. So, when we access the memory which 1190N/A * managed by agp gart in kernel space, we have to go 1185N/A * through two-level address translation: kernel virtual 1185N/A * address --> aperture address --> physical address. For 1185N/A * improving this, here in opensourced code, agp_remap() 1185N/A * gets invoking to dispose the mapping between agp aperture 1185N/A * and kernel space, and directly map the actual physical 1185N/A * memory which is allocated to agp gart to kernel space. 1185N/A * After that, access to physical memory managed by agp gart 1185N/A * hardware in kernel space doesn't go through agp hardware, 1185N/A * it will be: kernel virtual ---> physical address. 1185N/A * Obviously, it is more efficient. But in solaris operating 1190N/A * system, the ioctl AGPIOC_ALLOCATE of apggart driver does 1190N/A * not return physical address. We are unable to create the 1190N/A * direct mapping between kernel space and agp memory. So, 1185N/A * we remove the calling to agp_remap(). 1185N/A * Refer to the comments in drm_core_ioremap() where we removed 1212N/A * the calling to agp_remap(), correspondingly, we remove the 1388N/A * calling to agp_remap_free(dev, map); 1388N/A * For the time being, we compare the low 32 bit only, 1226N/A * We will hash handle to 32-bit to solve this issue later. 1465N/A 0xffffffff,
/* count_max */ 1465N/A /* allocat continous physical memory for hw status page */