drm_pci.c revision 1.41
1 /* $NetBSD: drm_pci.c,v 1.41 2021/12/19 10:33:00 riastradh 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 1.41 2021/12/19 10:33:00 riastradh 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/drm_device.h> 42 #include <drm/drm_drv.h> 43 #include <drm/drm_legacy.h> 44 #include <drm/drm_pci.h> 45 46 #include "../dist/drm/drm_internal.h" 47 48 struct drm_bus_irq_cookie { 49 pci_intr_handle_t *intr_handles; 50 void *ih_cookie; 51 }; 52 53 static const struct pci_attach_args * 54 drm_pci_attach_args(struct drm_device *dev) 55 { 56 return &dev->pdev->pd_pa; 57 } 58 59 int 60 drm_pci_attach(device_t self, const struct pci_attach_args *pa, 61 struct pci_dev *pdev, struct drm_driver *driver, unsigned long cookie, 62 struct drm_device **devp) 63 { 64 struct drm_device *dev; 65 unsigned int unit; 66 int ret; 67 68 /* Ensure the drm agp hooks are initialized. */ 69 /* XXX errno NetBSD->Linux */ 70 ret = -drm_guarantee_initialized(); 71 if (ret) 72 goto fail0; 73 74 /* Create a DRM device. */ 75 dev = drm_dev_alloc(driver, self); 76 if (dev == NULL) { 77 ret = -ENOMEM; 78 goto fail0; 79 } 80 81 dev->pdev = pdev; 82 83 /* XXX Set the power state to D0? */ 84 85 /* Set up the bus space and bus DMA tags. */ 86 dev->bst = pa->pa_memt; 87 dev->bus_dmat = (pci_dma64_available(pa)? pa->pa_dmat64 : pa->pa_dmat); 88 dev->bus_dmat32 = pa->pa_dmat; 89 dev->dmat = dev->bus_dmat; 90 dev->dmat_subregion_p = false; 91 dev->dmat_subregion_min = 0; 92 dev->dmat_subregion_max = __type_max(bus_addr_t); 93 94 /* Find all the memory maps. */ 95 CTASSERT(PCI_NUM_RESOURCES < (SIZE_MAX / sizeof(dev->bus_maps[0]))); 96 dev->bus_maps = kmem_zalloc(PCI_NUM_RESOURCES * 97 sizeof(dev->bus_maps[0]), KM_SLEEP); 98 dev->bus_nmaps = PCI_NUM_RESOURCES; 99 for (unit = 0; unit < PCI_NUM_RESOURCES; unit++) { 100 struct drm_bus_map *const bm = &dev->bus_maps[unit]; 101 const int reg = PCI_BAR(unit); 102 const pcireg_t type = 103 pci_mapreg_type(pa->pa_pc, pa->pa_tag, reg); 104 105 /* Reject non-memory mappings. */ 106 if ((type & PCI_MAPREG_TYPE_MEM) != PCI_MAPREG_TYPE_MEM) { 107 aprint_debug_dev(self, "map %u has non-memory type:" 108 " 0x%"PRIxMAX"\n", unit, (uintmax_t)type); 109 continue; 110 } 111 112 /* 113 * If it's a 64-bit mapping, don't interpret the second 114 * half of it as another BAR in the next iteration of 115 * the loop -- move on to the next unit. 116 */ 117 if (PCI_MAPREG_MEM_TYPE(type) == PCI_MAPREG_MEM_TYPE_64BIT) 118 unit++; 119 120 /* Inquire about it. We'll map it in drm_legacy_ioremap. */ 121 if (pci_mapreg_info(pa->pa_pc, pa->pa_tag, reg, type, 122 &bm->bm_base, &bm->bm_size, &bm->bm_flags) != 0) { 123 aprint_debug_dev(self, "map %u failed\n", unit); 124 continue; 125 } 126 127 /* Assume since it is a memory mapping it can be linear. */ 128 bm->bm_flags |= BUS_SPACE_MAP_LINEAR; 129 } 130 131 /* Set up AGP stuff if requested. */ 132 if (drm_core_check_feature(dev, DRIVER_USE_AGP)) { 133 if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP)) 134 dev->agp = drm_agp_init(dev); 135 if (dev->agp) 136 dev->agp->agp_mtrr = arch_phys_wc_add(dev->agp->base, 137 dev->agp->agp_info.aki_info.ai_aperture_size); 138 } 139 140 /* Register the DRM device and do driver-specific initialization. */ 141 ret = drm_dev_register(dev, cookie); 142 if (ret) 143 goto fail1; 144 145 /* Success! */ 146 *devp = dev; 147 return 0; 148 149 fail2: __unused 150 drm_dev_unregister(dev); 151 fail1: drm_pci_agp_destroy(dev); 152 dev->bus_nmaps = 0; 153 kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); 154 if (dev->dmat_subregion_p) { 155 bus_dmatag_destroy(dev->dmat); 156 } 157 drm_dev_put(dev); 158 fail0: return ret; 159 } 160 161 int 162 drm_pci_detach(struct drm_device *dev, int flags __unused) 163 { 164 165 /* Do driver-specific detachment and unregister the device. */ 166 drm_dev_unregister(dev); 167 168 /* Tear down AGP stuff if necessary. */ 169 drm_pci_agp_destroy(dev); 170 171 /* Free the record of available bus space mappings. */ 172 dev->bus_nmaps = 0; 173 kmem_free(dev->bus_maps, PCI_NUM_RESOURCES * sizeof(dev->bus_maps[0])); 174 175 /* Tear down bus space and bus DMA tags. */ 176 if (dev->dmat_subregion_p) { 177 bus_dmatag_destroy(dev->dmat); 178 } 179 180 drm_dev_put(dev); 181 182 return 0; 183 } 184 185 void 186 drm_pci_agp_destroy(struct drm_device *dev) 187 { 188 189 if (dev->agp) { 190 arch_phys_wc_del(dev->agp->agp_mtrr); 191 drm_agp_fini(dev); 192 KASSERT(dev->agp == NULL); 193 } 194 } 195 196 int 197 drm_pci_request_irq(struct drm_device *dev, int flags) 198 { 199 const char *const name = device_xname(dev->dev); 200 int (*const handler)(void *) = dev->driver->irq_handler; 201 const struct pci_attach_args *const pa = drm_pci_attach_args(dev); 202 const char *intrstr; 203 char intrbuf[PCI_INTRSTR_LEN]; 204 struct drm_bus_irq_cookie *irq_cookie; 205 206 irq_cookie = kmem_alloc(sizeof(*irq_cookie), KM_SLEEP); 207 208 if (dev->pdev->msi_enabled) { 209 if (dev->pdev->pd_intr_handles == NULL) { 210 if (pci_msi_alloc_exact(pa, &irq_cookie->intr_handles, 211 1)) { 212 aprint_error_dev(dev->dev, 213 "couldn't allocate MSI (%s)\n", name); 214 goto error; 215 } 216 } else { 217 irq_cookie->intr_handles = dev->pdev->pd_intr_handles; 218 dev->pdev->pd_intr_handles = NULL; 219 } 220 } else { 221 if (pci_intx_alloc(pa, &irq_cookie->intr_handles)) { 222 aprint_error_dev(dev->dev, 223 "couldn't allocate INTx interrupt (%s)\n", name); 224 goto error; 225 } 226 } 227 228 intrstr = pci_intr_string(pa->pa_pc, irq_cookie->intr_handles[0], 229 intrbuf, sizeof(intrbuf)); 230 irq_cookie->ih_cookie = pci_intr_establish_xname(pa->pa_pc, 231 irq_cookie->intr_handles[0], IPL_DRM, handler, dev, name); 232 if (irq_cookie->ih_cookie == NULL) { 233 aprint_error_dev(dev->dev, 234 "couldn't establish interrupt at %s (%s)\n", intrstr, name); 235 pci_intr_release(pa->pa_pc, irq_cookie->intr_handles, 1); 236 goto error; 237 } 238 239 aprint_normal_dev(dev->dev, "interrupting at %s (%s)\n", intrstr, name); 240 dev->irq_cookie = irq_cookie; 241 return 0; 242 243 error: 244 kmem_free(irq_cookie, sizeof(*irq_cookie)); 245 return -ENOENT; 246 } 247 248 void 249 drm_pci_free_irq(struct drm_device *dev) 250 { 251 struct drm_bus_irq_cookie *const cookie = dev->irq_cookie; 252 const struct pci_attach_args *pa = drm_pci_attach_args(dev); 253 254 pci_intr_disestablish(pa->pa_pc, cookie->ih_cookie); 255 pci_intr_release(pa->pa_pc, cookie->intr_handles, 1); 256 kmem_free(cookie, sizeof(*cookie)); 257 dev->irq_cookie = NULL; 258 } 259 260 int 261 drm_pci_set_busid(struct drm_device *dev, struct drm_master *master) 262 { 263 const struct pci_attach_args *const pa = &dev->pdev->pd_pa; 264 265 master->unique = kasprintf(GFP_KERNEL, "pci:%04x:%02x:%02x.%d", 266 device_unit(device_parent(dev->dev)), 267 pa->pa_bus, pa->pa_device, pa->pa_function); 268 if (master->unique == NULL) 269 return -ENOMEM; 270 master->unique_len = strlen(master->unique); 271 272 return 0; 273 } 274 275 int 276 drm_pci_set_unique(struct drm_device *dev, struct drm_master *master, 277 struct drm_unique *unique) 278 { 279 char kbuf[64], ubuf[64]; 280 int ret; 281 282 /* Reject excessively long unique strings. */ 283 if (unique->unique_len > sizeof(ubuf) - 1) 284 return -EINVAL; 285 286 /* Copy in the alleged unique string, NUL-terminated. */ 287 ret = -copyin(unique->unique, ubuf, unique->unique_len); 288 if (ret) 289 return ret; 290 ubuf[unique->unique_len] = '\0'; 291 292 /* Make sure it matches what we expect. */ 293 snprintf(kbuf, sizeof kbuf, "PCI:%d:%ld:%ld", dev->pdev->bus->number, 294 (long)PCI_SLOT(dev->pdev->devfn), 295 (long)PCI_FUNC(dev->pdev->devfn)); 296 if (strncmp(kbuf, ubuf, sizeof(kbuf)) != 0) 297 return -EINVAL; 298 299 /* Remember it. */ 300 master->unique = kstrdup(ubuf, GFP_KERNEL); 301 master->unique_len = strlen(master->unique); 302 303 /* Success! */ 304 return 0; 305 } 306
Indexes created Thu Sep 25 16:09:42 GMT 2025