i915_pci_autoconf.c revision 1.10
1 /* $NetBSD: i915_pci_autoconf.c,v 1.10 2021/12/19 12:28:12 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: i915_pci_autoconf.c,v 1.10 2021/12/19 12:28:12 riastradh Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/atomic.h> 37 #include <sys/queue.h> 38 #include <sys/systm.h> 39 #include <sys/queue.h> 40 #include <sys/workqueue.h> 41 42 #include <drm/drm_pci.h> 43 44 #include "i915_drv.h" 45 #include "i915_pci.h" 46 47 struct drm_device; 48 49 SIMPLEQ_HEAD(i915drmkms_task_head, i915drmkms_task); 50 51 struct i915drmkms_softc { 52 device_t sc_dev; 53 struct pci_attach_args sc_pa; 54 struct lwp *sc_task_thread; 55 struct i915drmkms_task_head sc_tasks; 56 struct workqueue *sc_task_wq; 57 struct drm_device *sc_drm_dev; 58 struct pci_dev sc_pci_dev; 59 }; 60 61 static const struct pci_device_id * 62 i915drmkms_pci_lookup(const struct pci_attach_args *); 63 64 static int i915drmkms_match(device_t, cfdata_t, void *); 65 static void i915drmkms_attach(device_t, device_t, void *); 66 static void i915drmkms_attach_real(device_t); 67 static int i915drmkms_detach(device_t, int); 68 69 static bool i915drmkms_suspend(device_t, const pmf_qual_t *); 70 static bool i915drmkms_resume(device_t, const pmf_qual_t *); 71 72 static void i915drmkms_task_work(struct work *, void *); 73 74 CFATTACH_DECL_NEW(i915drmkms, sizeof(struct i915drmkms_softc), 75 i915drmkms_match, i915drmkms_attach, i915drmkms_detach, NULL); 76 77 /* XXX Kludge to get these from i915_pci.c. */ 78 extern const struct pci_device_id *const i915_device_ids; 79 extern const size_t i915_n_device_ids; 80 81 static const struct pci_device_id * 82 i915drmkms_pci_lookup(const struct pci_attach_args *pa) 83 { 84 size_t i; 85 86 /* Attach only at function 0 to work around Intel lossage. */ 87 if (pa->pa_function != 0) 88 return NULL; 89 90 /* We're interested only in Intel products. */ 91 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_INTEL) 92 return NULL; 93 94 /* We're interested only in Intel display devices. */ 95 if (PCI_CLASS(pa->pa_class) != PCI_CLASS_DISPLAY) 96 return NULL; 97 98 for (i = 0; i < i915_n_device_ids; i++) 99 if (PCI_PRODUCT(pa->pa_id) == i915_device_ids[i].device) 100 break; 101 102 /* Did we find it? */ 103 if (i == i915_n_device_ids) 104 return NULL; 105 106 const struct pci_device_id *ent = &i915_device_ids[i]; 107 const struct intel_device_info *const info = (struct intel_device_info *) ent->driver_data; 108 109 if (info->require_force_probe) { 110 printf("i915drmkms: preliminary hardware support disabled\n"); 111 return NULL; 112 } 113 114 return ent; 115 } 116 117 static int 118 i915drmkms_match(device_t parent, cfdata_t match, void *aux) 119 { 120 extern int i915drmkms_guarantee_initialized(void); 121 const struct pci_attach_args *const pa = aux; 122 int error; 123 124 error = i915drmkms_guarantee_initialized(); 125 if (error) { 126 aprint_error("i915drmkms: failed to initialize: %d\n", error); 127 return 0; 128 } 129 130 if (i915drmkms_pci_lookup(pa) == NULL) 131 return 0; 132 133 return 6; /* XXX Beat genfb_pci... */ 134 } 135 136 static void 137 i915drmkms_attach(device_t parent, device_t self, void *aux) 138 { 139 struct i915drmkms_softc *const sc = device_private(self); 140 const struct pci_attach_args *const pa = aux; 141 int error; 142 143 pci_aprint_devinfo(pa, NULL); 144 145 /* Initialize the Linux PCI device descriptor. */ 146 linux_pci_dev_init(&sc->sc_pci_dev, self, parent, pa, 0); 147 148 sc->sc_dev = self; 149 sc->sc_pa = *pa; 150 sc->sc_task_thread = NULL; 151 SIMPLEQ_INIT(&sc->sc_tasks); 152 error = workqueue_create(&sc->sc_task_wq, "intelfb", 153 &i915drmkms_task_work, NULL, PRI_NONE, IPL_NONE, WQ_MPSAFE); 154 if (error) { 155 aprint_error_dev(self, "unable to create workqueue: %d\n", 156 error); 157 sc->sc_task_wq = NULL; 158 return; 159 } 160 161 /* 162 * Defer the remainder of initialization until we have mounted 163 * the root file system and can load firmware images. 164 */ 165 config_mountroot(self, &i915drmkms_attach_real); 166 } 167 168 static void 169 i915drmkms_attach_real(device_t self) 170 { 171 struct i915drmkms_softc *const sc = device_private(self); 172 struct pci_attach_args *const pa = &sc->sc_pa; 173 const struct pci_device_id *ent = i915drmkms_pci_lookup(pa); 174 const struct intel_device_info *const info = (struct intel_device_info *) ent->driver_data; 175 int error; 176 177 KASSERT(info != NULL); 178 179 /* 180 * Cause any tasks issued synchronously during attach to be 181 * processed at the end of this function. 182 */ 183 sc->sc_task_thread = curlwp; 184 185 /* Attach the drm driver. */ 186 /* XXX errno Linux->NetBSD */ 187 error = -i915_driver_probe(&sc->sc_pci_dev, ent); 188 if (error) { 189 aprint_error_dev(self, "unable to register drm: %d\n", error); 190 return; 191 } 192 sc->sc_drm_dev = pci_get_drvdata(&sc->sc_pci_dev); 193 194 /* 195 * Now that the drm driver is attached, we can safely suspend 196 * and resume. 197 */ 198 if (!pmf_device_register(self, &i915drmkms_suspend, 199 &i915drmkms_resume)) 200 aprint_error_dev(self, "unable to establish power handler\n"); 201 202 /* 203 * Process asynchronous tasks queued synchronously during 204 * attach. This will be for display detection to attach a 205 * framebuffer, so we have the opportunity for a console device 206 * to attach before autoconf has completed, in time for init(8) 207 * to find that console without panicking. 208 */ 209 while (!SIMPLEQ_EMPTY(&sc->sc_tasks)) { 210 struct i915drmkms_task *const task = 211 SIMPLEQ_FIRST(&sc->sc_tasks); 212 213 SIMPLEQ_REMOVE_HEAD(&sc->sc_tasks, ift_u.queue); 214 (*task->ift_fn)(task); 215 } 216 217 /* Cause any subesquent tasks to be processed by the workqueue. */ 218 atomic_store_relaxed(&sc->sc_task_thread, NULL); 219 } 220 221 static int 222 i915drmkms_detach(device_t self, int flags) 223 { 224 struct i915drmkms_softc *const sc = device_private(self); 225 int error; 226 227 /* XXX Check for in-use before tearing it all down... */ 228 error = config_detach_children(self, flags); 229 if (error) 230 return error; 231 232 KASSERT(sc->sc_task_thread == NULL); 233 KASSERT(SIMPLEQ_EMPTY(&sc->sc_tasks)); 234 235 pmf_device_deregister(self); 236 if (sc->sc_drm_dev) { 237 i915_driver_remove(sc->sc_drm_dev->dev_private); 238 sc->sc_drm_dev = NULL; 239 } 240 if (sc->sc_task_wq) { 241 workqueue_destroy(sc->sc_task_wq); 242 sc->sc_task_wq = NULL; 243 } 244 linux_pci_dev_destroy(&sc->sc_pci_dev); 245 246 return 0; 247 } 248 249 static bool 250 i915drmkms_suspend(device_t self, const pmf_qual_t *qual) 251 { 252 struct i915drmkms_softc *const sc = device_private(self); 253 struct drm_device *const dev = sc->sc_drm_dev; 254 int ret; 255 256 ret = i915_drm_suspend(dev); 257 if (ret) 258 return false; 259 ret = i915_drm_suspend_late(dev, false); 260 if (ret) 261 return false; 262 263 return true; 264 } 265 266 static bool 267 i915drmkms_resume(device_t self, const pmf_qual_t *qual) 268 { 269 struct i915drmkms_softc *const sc = device_private(self); 270 struct drm_device *const dev = sc->sc_drm_dev; 271 int ret; 272 273 ret = i915_drm_resume_early(dev); 274 if (ret) 275 return false; 276 ret = i915_drm_resume(dev); 277 if (ret) 278 return false; 279 280 return true; 281 } 282 283 static void 284 i915drmkms_task_work(struct work *work, void *cookie __unused) 285 { 286 struct i915drmkms_task *const task = container_of(work, 287 struct i915drmkms_task, ift_u.work); 288 289 (*task->ift_fn)(task); 290 } 291 292 int 293 i915drmkms_task_schedule(device_t self, struct i915drmkms_task *task) 294 { 295 struct i915drmkms_softc *const sc = device_private(self); 296 297 if (atomic_load_relaxed(&sc->sc_task_thread) == curlwp) 298 SIMPLEQ_INSERT_TAIL(&sc->sc_tasks, task, ift_u.queue); 299 else 300 workqueue_enqueue(sc->sc_task_wq, &task->ift_u.work, NULL); 301 302 return 0; 303 } 304
Indexes created Fri Sep 26 20:09:58 GMT 2025