Staging: strip: delete the driver
[linux/fpc-iii.git] / drivers / gpu / drm / drm_pci.c
blob2ea9ad4a8d699847bb4e8a7d0f1e7dc58ace90e4
1 /* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
2 /**
3 * \file drm_pci.c
4 * \brief Functions and ioctls to manage PCI memory
6 * \warning These interfaces aren't stable yet.
8 * \todo Implement the remaining ioctl's for the PCI pools.
9 * \todo The wrappers here are so thin that they would be better off inlined..
11 * \author José Fonseca <jrfonseca@tungstengraphics.com>
12 * \author Leif Delgass <ldelgass@retinalburn.net>
16 * Copyright 2003 José Fonseca.
17 * Copyright 2003 Leif Delgass.
18 * All Rights Reserved.
20 * Permission is hereby granted, free of charge, to any person obtaining a
21 * copy of this software and associated documentation files (the "Software"),
22 * to deal in the Software without restriction, including without limitation
23 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
24 * and/or sell copies of the Software, and to permit persons to whom the
25 * Software is furnished to do so, subject to the following conditions:
27 * The above copyright notice and this permission notice (including the next
28 * paragraph) shall be included in all copies or substantial portions of the
29 * Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
32 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
33 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
34 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
35 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
36 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
39 #include <linux/pci.h>
40 #include <linux/slab.h>
41 #include <linux/dma-mapping.h>
42 #include "drmP.h"
44 /**********************************************************************/
45 /** \name PCI memory */
46 /*@{*/
48 /**
49 * \brief Allocate a PCI consistent memory block, for DMA.
51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
53 drm_dma_handle_t *dmah;
54 #if 1
55 unsigned long addr;
56 size_t sz;
57 #endif
59 /* pci_alloc_consistent only guarantees alignment to the smallest
60 * PAGE_SIZE order which is greater than or equal to the requested size.
61 * Return NULL here for now to make sure nobody tries for larger alignment
63 if (align > size)
64 return NULL;
66 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
67 if (!dmah)
68 return NULL;
70 dmah->size = size;
71 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
73 if (dmah->vaddr == NULL) {
74 kfree(dmah);
75 return NULL;
78 memset(dmah->vaddr, 0, size);
80 /* XXX - Is virt_to_page() legal for consistent mem? */
81 /* Reserve */
82 for (addr = (unsigned long)dmah->vaddr, sz = size;
83 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
84 SetPageReserved(virt_to_page(addr));
87 return dmah;
90 EXPORT_SYMBOL(drm_pci_alloc);
92 /**
93 * \brief Free a PCI consistent memory block without freeing its descriptor.
95 * This function is for internal use in the Linux-specific DRM core code.
97 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
99 #if 1
100 unsigned long addr;
101 size_t sz;
102 #endif
104 if (dmah->vaddr) {
105 /* XXX - Is virt_to_page() legal for consistent mem? */
106 /* Unreserve */
107 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
108 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
109 ClearPageReserved(virt_to_page(addr));
111 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
112 dmah->busaddr);
117 * \brief Free a PCI consistent memory block
119 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
121 __drm_pci_free(dev, dmah);
122 kfree(dmah);
125 EXPORT_SYMBOL(drm_pci_free);
127 /*@}*/