i915_pci_autoconf.c revision 1.2
1 /* $NetBSD: i915_pci_autoconf.c,v 1.2 2021/12/19 01:46:16 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 1.2 2021/12/19 01:46:16 riastradh Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/queue.h> 37 #include <sys/systm.h> 38 #include <sys/queue.h> 39 #include <sys/workqueue.h> 40 41 #include <drm/drmP.h> 42 43 #include "i915_drv.h" 44 #include "i915_pci.h" 45 46 SIMPLEQ_HEAD(i915drmkms_task_head, i915drmkms_task); 47 48 struct i915drmkms_softc { 49 device_t sc_dev; 50 struct pci_attach_args sc_pa; 51 enum { 52 I915DRMKMS_TASK_ATTACH, 53 I915DRMKMS_TASK_WORKQUEUE, 54 } sc_task_state; 55 union { 56 struct workqueue *workqueue; 57 struct i915drmkms_task_head attach; 58 } sc_task_u; 59 struct drm_device *sc_drm_dev; 60 struct pci_dev sc_pci_dev; 61 }; 62 63 static const struct intel_device_info * 64 i915drmkms_pci_lookup(const struct pci_attach_args *); 65 66 static int i915drmkms_match(device_t, cfdata_t, void *); 67 static void i915drmkms_attach(device_t, device_t, void *); 68 static void i915drmkms_attach_real(device_t); 69 static int i915drmkms_detach(device_t, int); 70 71 static bool i915drmkms_suspend(device_t, const pmf_qual_t *); 72 static bool i915drmkms_resume(device_t, const pmf_qual_t *); 73 74 static void i915drmkms_task_work(struct work *, void *); 75 76 CFATTACH_DECL_NEW(i915drmkms, sizeof(struct i915drmkms_softc), 77 i915drmkms_match, i915drmkms_attach, i915drmkms_detach, NULL); 78 79 /* XXX Kludge to get these from i915_drv.c. */ 80 extern struct drm_driver *const i915_drm_driver; 81 extern const struct pci_device_id *const i915_device_ids; 82 extern const size_t i915_n_device_ids; 83 84 static const struct intel_device_info * 85 i915drmkms_pci_lookup(const struct pci_attach_args *pa) 86 { 87 size_t i; 88 89 /* Attach only at function 0 to work around Intel lossage. */ 90 if (pa->pa_function != 0) 91 return NULL; 92 93 /* We're interested only in Intel products. */ 94 if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_INTEL) 95 return NULL; 96 97 /* We're interested only in Intel display devices. */ 98 if (PCI_CLASS(pa->pa_class) != PCI_CLASS_DISPLAY) 99 return NULL; 100 101 for (i = 0; i < i915_n_device_ids; i++) 102 if (PCI_PRODUCT(pa->pa_id) == i915_device_ids[i].device) 103 break; 104 105 /* Did we find it? */ 106 if (i == i915_n_device_ids) 107 return NULL; 108 109 const struct intel_device_info *const info = 110 (const void *)(uintptr_t)i915_device_ids[i].driver_data; 111 112 if (IS_ALPHA_SUPPORT(info)) { 113 printf("i915drmkms: preliminary hardware support disabled\n"); 114 return NULL; 115 } 116 117 return info; 118 } 119 120 static int 121 i915drmkms_match(device_t parent, cfdata_t match, void *aux) 122 { 123 extern int i915drmkms_guarantee_initialized(void); 124 const struct pci_attach_args *const pa = aux; 125 int error; 126 127 error = i915drmkms_guarantee_initialized(); 128 if (error) { 129 aprint_error("i915drmkms: failed to initialize: %d\n", error); 130 return 0; 131 } 132 133 if (i915drmkms_pci_lookup(pa) == NULL) 134 return 0; 135 136 return 6; /* XXX Beat genfb_pci... */ 137 } 138 139 static void 140 i915drmkms_attach(device_t parent, device_t self, void *aux) 141 { 142 struct i915drmkms_softc *const sc = device_private(self); 143 const struct pci_attach_args *const pa = aux; 144 145 pci_aprint_devinfo(pa, NULL); 146 147 if (!pmf_device_register(self, &i915drmkms_suspend, 148 &i915drmkms_resume)) 149 aprint_error_dev(self, "unable to establish power handler\n"); 150 151 /* 152 * Trivial initialization first; the rest will come after we 153 * have mounted the root file system and can load firmware 154 * images. 155 */ 156 sc->sc_dev = self; 157 sc->sc_pa = *pa; 158 159 config_mountroot(self, &i915drmkms_attach_real); 160 } 161 162 static void 163 i915drmkms_attach_real(device_t self) 164 { 165 struct i915drmkms_softc *const sc = device_private(self); 166 struct pci_attach_args *const pa = &sc->sc_pa; 167 const struct intel_device_info *const info = i915drmkms_pci_lookup(pa); 168 const unsigned long cookie = 169 (unsigned long)(uintptr_t)(const void *)info; 170 int error; 171 172 KASSERT(info != NULL); 173 174 sc->sc_task_state = I915DRMKMS_TASK_ATTACH; 175 SIMPLEQ_INIT(&sc->sc_task_u.attach); 176 177 /* Initialize the Linux PCI device descriptor. */ 178 linux_pci_dev_init(&sc->sc_pci_dev, self, device_parent(self), pa, 0); 179 180 /* XXX errno Linux->NetBSD */ 181 error = -drm_pci_attach(self, pa, &sc->sc_pci_dev, i915_drm_driver, 182 cookie, &sc->sc_drm_dev); 183 if (error) { 184 aprint_error_dev(self, "unable to attach drm: %d\n", error); 185 return; 186 } 187 188 while (!SIMPLEQ_EMPTY(&sc->sc_task_u.attach)) { 189 struct i915drmkms_task *const task = 190 SIMPLEQ_FIRST(&sc->sc_task_u.attach); 191 192 SIMPLEQ_REMOVE_HEAD(&sc->sc_task_u.attach, ift_u.queue); 193 (*task->ift_fn)(task); 194 } 195 196 sc->sc_task_state = I915DRMKMS_TASK_WORKQUEUE; 197 error = workqueue_create(&sc->sc_task_u.workqueue, "intelfb", 198 &i915drmkms_task_work, NULL, PRI_NONE, IPL_NONE, WQ_MPSAFE); 199 if (error) { 200 aprint_error_dev(self, "unable to create workqueue: %d\n", 201 error); 202 sc->sc_task_u.workqueue = NULL; 203 return; 204 } 205 } 206 207 static int 208 i915drmkms_detach(device_t self, int flags) 209 { 210 struct i915drmkms_softc *const sc = device_private(self); 211 int error; 212 213 /* XXX Check for in-use before tearing it all down... */ 214 error = config_detach_children(self, flags); 215 if (error) 216 return error; 217 218 if (sc->sc_task_state == I915DRMKMS_TASK_ATTACH) 219 goto out; 220 if (sc->sc_task_u.workqueue != NULL) { 221 workqueue_destroy(sc->sc_task_u.workqueue); 222 sc->sc_task_u.workqueue = NULL; 223 } 224 225 if (sc->sc_drm_dev == NULL) 226 goto out; 227 /* XXX errno Linux->NetBSD */ 228 error = -drm_pci_detach(sc->sc_drm_dev, flags); 229 if (error) 230 /* XXX Kinda too late to fail now... */ 231 return error; 232 sc->sc_drm_dev = NULL; 233 234 out: linux_pci_dev_destroy(&sc->sc_pci_dev); 235 pmf_device_deregister(self); 236 return 0; 237 } 238 239 static bool 240 i915drmkms_suspend(device_t self, const pmf_qual_t *qual) 241 { 242 struct i915drmkms_softc *const sc = device_private(self); 243 struct drm_device *const dev = sc->sc_drm_dev; 244 int ret; 245 246 if (dev == NULL) 247 return true; 248 249 ret = i915_drm_suspend(dev); 250 if (ret) 251 return false; 252 ret = i915_drm_suspend_late(dev, false); 253 if (ret) 254 return false; 255 256 return true; 257 } 258 259 static bool 260 i915drmkms_resume(device_t self, const pmf_qual_t *qual) 261 { 262 struct i915drmkms_softc *const sc = device_private(self); 263 struct drm_device *const dev = sc->sc_drm_dev; 264 int ret; 265 266 if (dev == NULL) 267 return true; 268 269 ret = i915_drm_resume_early(dev); 270 if (ret) 271 return false; 272 ret = i915_drm_resume(dev); 273 if (ret) 274 return false; 275 276 return true; 277 } 278 279 static void 280 i915drmkms_task_work(struct work *work, void *cookie __unused) 281 { 282 struct i915drmkms_task *const task = container_of(work, 283 struct i915drmkms_task, ift_u.work); 284 285 (*task->ift_fn)(task); 286 } 287 288 int 289 i915drmkms_task_schedule(device_t self, struct i915drmkms_task *task) 290 { 291 struct i915drmkms_softc *const sc = device_private(self); 292 293 switch (sc->sc_task_state) { 294 case I915DRMKMS_TASK_ATTACH: 295 SIMPLEQ_INSERT_TAIL(&sc->sc_task_u.attach, task, ift_u.queue); 296 return 0; 297 case I915DRMKMS_TASK_WORKQUEUE: 298 if (sc->sc_task_u.workqueue == NULL) { 299 aprint_error_dev(self, "unable to schedule task\n"); 300 return EIO; 301 } 302 workqueue_enqueue(sc->sc_task_u.workqueue, &task->ift_u.work, 303 NULL); 304 return 0; 305 default: 306 panic("i915drmkms in invalid task state: %d\n", 307 (int)sc->sc_task_state); 308 } 309 } 310
Indexes created Wed Sep 24 15:09:51 GMT 2025