drm_pci.c revision 1.18.2.1
1 /* $NetBSD: drm_pci.c,v 1.18.2.1 2018/09/06 06:56:37 pgoyette Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: drm_pci.c,v 1.18.2.1 2018/09/06 06:56:37 pgoyette Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/errno.h> 37 #include <sys/systm.h> 38 39 #include <dev/pci/pcivar.h> 40 41 #include <drm/drmP.h> 42 #include <drm/drm_legacy.h> 43 44 struct drm_bus_irq_cookie { 45 pci_intr_handle_t *intr_handles; 46 void *ih_cookie; 47 }; 48 49 static const struct pci_attach_args * 50 drm_pci_attach_args(struct drm_device *dev) 51 { 52 return &dev->pdev->pd_pa; 53 } 54 55 int 56 drm_pci_attach(device_t self, const struct pci_attach_args *pa, 57 struct pci_dev *pdev, struct drm_driver *driver, unsigned long cookie, 58 struct drm_device **devp) 59 { 60 struct drm_device *dev; 61 unsigned int unit; 62 int ret; 63 64 /* Ensure the drm agp hooks are initialized. */ 65 /* XXX errno NetBSD->Linux */ 66 ret = -drm_guarantee_initialized(); 67 if (ret) 68 goto fail0; 69 70 /* Create a DRM device. */ 71 dev = drm_dev_alloc(driver, self); 72 if (dev == NULL) { 73 ret = -ENOMEM; 74 goto fail0; 75 } 76 77 dev->pdev = pdev; 78 pdev->pd_drm_dev = dev; /* XXX Nouveau kludge. */ 79 80 /* XXX Set the power state to D0? */ 81 82 /* Set up the bus space and bus DMA tags. */ 83 dev->bst = pa->pa_memt; 84 dev->bus_dmat = (pci_dma64_available(pa)? pa->pa_dmat64 : pa->pa_dmat); 85 dev->bus_dmat32 = pa->pa_dmat; 86 dev->dmat = dev->bus_dmat; 87 dev->dmat_subregion_p = false; 88 dev->dmat_subregion_min = 0; 89 dev->dmat_subregion_max = __type_max(bus_addr_t); 90 91 /* Find all the memory maps. */ 92 CTASSERT(PCI_NUM_RESOURCES < (SIZE_MAX / sizeof(dev->bus_maps[0]))); 93 dev->bus_maps = kmem_zalloc(PCI_NUM_RESOURCES * 94 sizeof(dev->bus_maps[0]), KM_SLEEP); 95 dev->bus_nmaps = PCI_NUM_RESOURCES; 96 for (unit = 0; unit < PCI_NUM_RESOURCES; unit++) { 97 struct drm_bus_map *const bm = &dev->bus_maps[unit]; 98 const int reg = PCI_BAR(unit); 99 const pcireg_t type = 100 pci_mapreg_type(pa->pa_pc, pa->pa_tag, reg); 101 102 /* Reject non-memory mappings. */ 103 if ((type & PCI_MAPREG_TYPE_MEM) != PCI_MAPREG_TYPE_MEM) { 104 aprint_debug_dev(self, "map %u has non-memory type:" 105 " 0x%"PRIxMAX"\n", unit, (uintmax_t)type); 106 continue; 107 } 108 109 /* Inquire about it. We'll map it in drm_legacy_ioremap. */ 110 if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, reg, type, 111 &bm->bm_base, &bm->bm_size, &bm->bm_flags) != 0) { 112 aprint_debug_dev(self, "map %u failed\n", unit); 113 continue; 114 } 115 116 /* Assume since it is a memory mapping it can be linear. */ 117 bm->bm_flags |= BUS_SPACE_MAP_LINEAR; 118 } 119 120 /* Set up AGP stuff if requested. */ 121 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 122 if (drm_pci_device_is_agp(dev)) 123 dev->agp = drm_agp_init(dev); 124 if (dev->agp) 125 dev->agp->agp_mtrr = arch_phys_wc_add(dev->agp->base, 126 dev->agp->agp_info.aki_info.ai_aperture_size); 127 } 128 129 /* Register the DRM device and do driver-specific initialization. */ 130 ret = drm_dev_register(dev, cookie); 131 if (ret) 132 goto fail1; 133 134 /* Success! */ 135 *devp = dev; 136 return 0; 137 138 fail2: __unused 139 drm_dev_unregister(dev); 140 fail1: drm_pci_agp_destroy(dev); 141 dev->bus_nmaps = 0; 142 kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); 143 if (dev->dmat_subregion_p) { 144 bus_dmatag_destroy(dev->dmat); 145 } 146 drm_dev_unref(dev); 147 fail0: return ret; 148 } 149 150 int 151 drm_pci_detach(struct drm_device *dev, int flags __unused) 152 { 153 154 /* Do driver-specific detachment and unregister the device. */ 155 drm_dev_unregister(dev); 156 157 /* Tear down AGP stuff if necessary. */ 158 drm_pci_agp_destroy(dev); 159 160 /* Free the record of available bus space mappings. */ 161 dev->bus_nmaps = 0; 162 kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); 163 164 /* Tear down bus space and bus DMA tags. */ 165 if (dev->dmat_subregion_p) { 166 bus_dmatag_destroy(dev->dmat); 167 } 168 169 drm_dev_unref(dev); 170 171 return 0; 172 } 173 174 void 175 drm_pci_agp_destroy(struct drm_device *dev) 176 { 177 178 if (dev->agp) { 179 arch_phys_wc_del(dev->agp->agp_mtrr); 180 drm_agp_fini(dev); 181 KASSERT(dev->agp == NULL); 182 } 183 } 184 185 int 186 drm_pci_request_irq(struct drm_device *dev, int flags) 187 { 188 const char *const name = device_xname(dev->dev); 189 int (*const handler)(void *) = dev->driver->irq_handler; 190 const struct pci_attach_args *const pa = drm_pci_attach_args(dev); 191 const char *intrstr; 192 char intrbuf[PCI_INTRSTR_LEN]; 193 struct drm_bus_irq_cookie *irq_cookie; 194 195 irq_cookie = kmem_alloc(sizeof(*irq_cookie), KM_SLEEP); 196 197 if (dev->pdev->msi_enabled) { 198 if (dev->pdev->pd_intr_handles == NULL) { 199 if (pci_msi_alloc_exact(pa, &irq_cookie->intr_handles, 200 1)) { 201 aprint_error_dev(dev->dev, 202 "couldn't allocate MSI (%s)\n", name); 203 goto error; 204 } 205 } else { 206 irq_cookie->intr_handles = dev->pdev->pd_intr_handles; 207 dev->pdev->pd_intr_handles = NULL; 208 } 209 } else { 210 if (pci_intx_alloc(pa, &irq_cookie->intr_handles)) { 211 aprint_error_dev(dev->dev, 212 "couldn't allocate INTx interrupt (%s)\n", name); 213 goto error; 214 } 215 } 216 217 intrstr = pci_intr_string(pa->pa_pc, irq_cookie->intr_handles[0], 218 intrbuf, sizeof(intrbuf)); 219 irq_cookie->ih_cookie = pci_intr_establish_xname(pa->pa_pc, 220 irq_cookie->intr_handles[0], IPL_DRM, handler, dev, name); 221 if (irq_cookie->ih_cookie == NULL) { 222 aprint_error_dev(dev->dev, 223 "couldn't establish interrupt at %s (%s)\n", intrstr, name); 224 pci_intr_release(pa->pa_pc, irq_cookie->intr_handles, 1); 225 goto error; 226 } 227 228 aprint_normal_dev(dev->dev, "interrupting at %s (%s)\n", intrstr, name); 229 dev->irq_cookie = irq_cookie; 230 return 0; 231 232 error: 233 kmem_free(irq_cookie, sizeof(*irq_cookie)); 234 return -ENOENT; 235 } 236 237 void 238 drm_pci_free_irq(struct drm_device *dev) 239 { 240 struct drm_bus_irq_cookie *const cookie = dev->irq_cookie; 241 const struct pci_attach_args *pa = drm_pci_attach_args(dev); 242 243 pci_intr_disestablish(pa->pa_pc, cookie->ih_cookie); 244 pci_intr_release(pa->pa_pc, cookie->intr_handles, 1); 245 kmem_free(cookie, sizeof(*cookie)); 246 dev->irq_cookie = NULL; 247 } 248 249 int 250 drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 251 { 252 const struct pci_attach_args *const pa = &dev->pdev->pd_pa; 253 254 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 255 device_unit(device_parent(dev->dev)), 256 pa->pa_bus, pa->pa_device, pa->pa_function); 257 if (master->unique == NULL) 258 return -ENOMEM; 259 master->unique_len = strlen(master->unique); 260 261 return 0; 262 } 263 264 int 265 drm_pci_set_unique(struct drm_device *dev, struct drm_master *master, 266 struct drm_unique *unique) 267 { 268 char kbuf[64], ubuf[64]; 269 int ret; 270 271 /* Reject excessively long unique strings. */ 272 if (unique->unique_len > sizeof(ubuf) - 1) 273 return -EINVAL; 274 275 /* Copy in the alleged unique string, NUL-terminated. */ 276 ret = -copyin(unique->unique, ubuf, unique->unique_len); 277 if (ret) 278 return ret; 279 ubuf[unique->unique_len] = '\0'; 280 281 /* Make sure it matches what we expect. */ 282 snprintf(kbuf, sizeof kbuf, "PCI:%d:%ld:%ld", dev->pdev->bus->number, 283 (long)PCI_SLOT(dev->pdev->devfn), 284 (long)PCI_FUNC(dev->pdev->devfn)); 285 if (strncmp(kbuf, ubuf, sizeof(kbuf)) != 0) 286 return -EINVAL; 287 288 /* Remember it. */ 289 master->unique = kstrdup(ubuf, GFP_KERNEL); 290 master->unique_len = strlen(master->unique); 291 292 /* Success! */ 293 return 0; 294 } 295
Indexes created Thu Oct 02 14:10:14 GMT 2025