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 5 * 6 * \warning These interfaces aren't stable yet. 7 * 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.. 10 * 11 * \author Jos�� Fonseca <jrfonseca@tungstengraphics.com> 12 * \author Leif Delgass <ldelgass@retinalburn.net> 13 */ 14 15/* 16 * Copyright 2003 Jos�� Fonseca. 17 * Copyright 2003 Leif Delgass. 18 * All Rights Reserved. 19 * 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: 26 * 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. 30 * 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. 37 */ 38 39#include <linux/pci.h> 40#include <linux/slab.h> 41#include <linux/dma-mapping.h> 42#include "drmP.h" 43 44/**********************************************************************/ 45/** \name PCI memory */ 46/*@{*/ 47 48/** 49 * \brief Allocate a PCI consistent memory block, for DMA. 50 */ 51drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 52{ 53 drm_dma_handle_t *dmah; 54 unsigned long addr; 55 size_t sz; 56 57 /* pci_alloc_consistent only guarantees alignment to the smallest 58 * PAGE_SIZE order which is greater than or equal to the requested size. 59 * Return NULL here for now to make sure nobody tries for larger alignment 60 */ 61 if (align > size) 62 return NULL; 63 64 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 65 if (!dmah) 66 return NULL; 67 68 dmah->size = size; 69 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 70 71 if (dmah->vaddr == NULL) { 72 kfree(dmah); 73 return NULL; 74 } 75 76 memset(dmah->vaddr, 0, size); 77 78 /* Reserve */ 79 for (addr = (unsigned long)dmah->vaddr, sz = size; 80 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 81 SetPageReserved(virt_to_page(addr)); 82 } 83 84 return dmah; 85} 86 87EXPORT_SYMBOL(drm_pci_alloc); 88 89/** 90 * \brief Free a PCI consistent memory block without freeing its descriptor. 91 * 92 * This function is for internal use in the Linux-specific DRM core code. 93 */ 94void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 95{ 96 unsigned long addr; 97 size_t sz; 98 99 if (dmah->vaddr) { 100 /* Unreserve */ 101 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 102 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 103 ClearPageReserved(virt_to_page(addr)); 104 } 105 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 106 dmah->busaddr); 107 } 108} 109 110/** 111 * \brief Free a PCI consistent memory block 112 */ 113void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 114{ 115 __drm_pci_free(dev, dmah); 116 kfree(dmah); 117} 118 119EXPORT_SYMBOL(drm_pci_free); 120 121#ifdef CONFIG_PCI 122/** 123 * Register. 124 * 125 * \param pdev - PCI device structure 126 * \param ent entry from the PCI ID table with device type flags 127 * \return zero on success or a negative number on failure. 128 * 129 * Attempt to gets inter module "drm" information. If we are first 130 * then register the character device and inter module information. 131 * Try and register, if we fail to register, backout previous work. 132 */ 133int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, 134 struct drm_driver *driver) 135{ 136 struct drm_device *dev; 137 int ret; 138 139 DRM_DEBUG("\n"); 140 141 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 142 if (!dev) 143 return -ENOMEM; 144 145 ret = pci_enable_device(pdev); 146 if (ret) 147 goto err_g1; 148 149 pci_set_master(pdev); 150 151 dev->pdev = pdev; 152 dev->dev = &pdev->dev; 153 154 dev->pci_device = pdev->device; 155 dev->pci_vendor = pdev->vendor; 156 157#ifdef __alpha__ 158 dev->hose = pdev->sysdata; 159#endif 160 161 mutex_lock(&drm_global_mutex); 162 163 if ((ret = drm_fill_in_dev(dev, ent, driver))) { 164 printk(KERN_ERR "DRM: Fill_in_dev failed.\n"); 165 goto err_g2; 166 } 167 168 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 169 pci_set_drvdata(pdev, dev); 170 ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL); 171 if (ret) 172 goto err_g2; 173 } 174 175 if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY))) 176 goto err_g3; 177 178 if (dev->driver->load) { 179 ret = dev->driver->load(dev, ent->driver_data); 180 if (ret) 181 goto err_g4; 182 } 183 184 /* setup the grouping for the legacy output */ 185 if (drm_core_check_feature(dev, DRIVER_MODESET)) { 186 ret = drm_mode_group_init_legacy_group(dev, 187 &dev->primary->mode_group); 188 if (ret) 189 goto err_g4; 190 } 191 192 list_add_tail(&dev->driver_item, &driver->device_list); 193 194 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", 195 driver->name, driver->major, driver->minor, driver->patchlevel, 196 driver->date, pci_name(pdev), dev->primary->index); 197 198 mutex_unlock(&drm_global_mutex); 199 return 0; 200 201err_g4: 202 drm_put_minor(&dev->primary); 203err_g3: 204 if (drm_core_check_feature(dev, DRIVER_MODESET)) 205 drm_put_minor(&dev->control); 206err_g2: 207 pci_disable_device(pdev); 208err_g1: 209 kfree(dev); 210 mutex_unlock(&drm_global_mutex); 211 return ret; 212} 213EXPORT_SYMBOL(drm_get_pci_dev); 214 215/** 216 * PCI device initialization. Called via drm_init at module load time, 217 * 218 * \return zero on success or a negative number on failure. 219 * 220 * Initializes a drm_device structures,registering the 221 * stubs and initializing the AGP device. 222 * 223 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and 224 * after the initialization for driver customization. 225 */ 226int drm_pci_init(struct drm_driver *driver) 227{ 228 struct pci_dev *pdev = NULL; 229 const struct pci_device_id *pid; 230 int i; 231 232 if (driver->driver_features & DRIVER_MODESET) 233 return pci_register_driver(&driver->pci_driver); 234 235 /* If not using KMS, fall back to stealth mode manual scanning. */ 236 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) { 237 pid = &driver->pci_driver.id_table[i]; 238 239 /* Loop around setting up a DRM device for each PCI device 240 * matching our ID and device class. If we had the internal 241 * function that pci_get_subsys and pci_get_class used, we'd 242 * be able to just pass pid in instead of doing a two-stage 243 * thing. 244 */ 245 pdev = NULL; 246 while ((pdev = 247 pci_get_subsys(pid->vendor, pid->device, pid->subvendor, 248 pid->subdevice, pdev)) != NULL) { 249 if ((pdev->class & pid->class_mask) != pid->class) 250 continue; 251 252 /* stealth mode requires a manual probe */ 253 pci_dev_get(pdev); 254 drm_get_pci_dev(pdev, pid, driver); 255 } 256 } 257 return 0; 258} 259 260#else 261 262int drm_pci_init(struct drm_driver *driver) 263{ 264 return -1; 265} 266 267#endif 268/*@}*/ 269