4 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
6 * This code is derived from software contributed to The DragonFly Project
7 * by Matthew Dillon <dillon@backplane.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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
17 * the documentation and/or other materials provided with the
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Primary device and CAM interface to OpenBSD AHCI driver, for DragonFly
42 u_int32_t AhciForceGen = 0;
43 u_int32_t AhciNoFeatures = 0;
49 static int ahci_probe (device_t dev);
50 static int ahci_attach (device_t dev);
51 static int ahci_detach (device_t dev);
52 static int ahci_sysctl_link_pwr_mgmt (SYSCTL_HANDLER_ARGS);
54 static int ahci_shutdown (device_t dev);
55 static int ahci_suspend (device_t dev);
56 static int ahci_resume (device_t dev);
59 static void ahci_port_thread(void *arg);
61 static device_method_t ahci_methods[] = {
62 DEVMETHOD(device_probe, ahci_probe),
63 DEVMETHOD(device_attach, ahci_attach),
64 DEVMETHOD(device_detach, ahci_detach),
66 DEVMETHOD(device_shutdown, ahci_shutdown),
67 DEVMETHOD(device_suspend, ahci_suspend),
68 DEVMETHOD(device_resume, ahci_resume),
71 DEVMETHOD(bus_print_child, bus_generic_print_child),
72 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
76 static devclass_t ahci_devclass;
78 static driver_t ahci_driver = {
81 sizeof(struct ahci_softc)
84 MODULE_DEPEND(ahci, cam, 1, 1, 1);
85 DRIVER_MODULE(ahci, pci, ahci_driver, ahci_devclass, NULL, NULL);
86 MODULE_VERSION(ahci, 1);
89 * Device bus method procedures
92 ahci_probe (device_t dev)
94 const struct ahci_device *ad;
96 if (kgetenv("hint.ahci.disabled"))
99 ad = ahci_lookup_device(dev);
101 device_set_desc(dev, ad->name);
102 return(-5); /* higher priority the NATA */
108 ahci_attach (device_t dev)
110 struct ahci_softc *sc = device_get_softc(dev);
112 sc->sc_ad = ahci_lookup_device(dev);
113 if (sc->sc_ad == NULL)
117 * Some chipsets do not properly implement the AHCI spec and may
118 * require the link speed to be specifically requested.
120 if (kgetenv("hint.ahci.force150"))
122 if (kgetenv("hint.ahci.force300"))
124 if (kgetenv("hint.ahci.force600"))
127 if (kgetenv("hint.ahci.nofeatures"))
130 if (kgetenv("hint.ahci.forcefbss"))
131 sc->sc_flags |= AHCI_F_FORCE_FBSS;
133 return (sc->sc_ad->ad_attach(dev));
137 ahci_detach (device_t dev)
139 struct ahci_softc *sc = device_get_softc(dev);
143 error = sc->sc_ad->ad_detach(dev);
150 ahci_sysctl_link_pwr_mgmt (SYSCTL_HANDLER_ARGS)
152 struct ahci_port *ap = arg1;
153 int error, link_pwr_mgmt;
155 link_pwr_mgmt = ap->link_pwr_mgmt;
156 error = sysctl_handle_int(oidp, &link_pwr_mgmt, 0, req);
157 if (error || req->newptr == NULL)
160 ahci_port_link_pwr_mgmt(ap, link_pwr_mgmt);
165 ahci_sysctl_link_pwr_state (SYSCTL_HANDLER_ARGS)
167 struct ahci_port *ap = arg1;
168 const char *state_names[] = {"unknown", "active", "partial", "slumber"};
172 state = ahci_port_link_pwr_state(ap);
173 if (state < 0 || state >= NELEM(state_names))
176 ksnprintf(buf, sizeof(buf), "%s", state_names[state]);
177 return sysctl_handle_string(oidp, buf, sizeof(buf), req);
183 ahci_shutdown (device_t dev)
189 ahci_suspend (device_t dev)
195 ahci_resume (device_t dev)
203 * Sleep (ms) milliseconds, error on the side of caution.
206 ahci_os_sleep(int ms)
210 ticks = hz * ms / 1000 + 1;
211 tsleep(&ticks, 0, "ahslp", ticks);
215 * Sleep for a minimum interval and return the number of milliseconds
216 * that was. The minimum value returned is 1
219 ahci_os_softsleep(void)
222 tsleep(&ticks, 0, "ahslp", hz / 1000);
225 tsleep(&ticks, 0, "ahslp", 1);
231 ahci_os_hardsleep(int us)
237 * Create the OS-specific port helper thread and per-port lock.
240 ahci_os_start_port(struct ahci_port *ap)
242 struct sysctl_oid *soid;
245 atomic_set_int(&ap->ap_signal, AP_SIGF_INIT | AP_SIGF_THREAD_SYNC);
246 lockinit(&ap->ap_lock, "ahcipo", 0, LK_CANRECURSE);
247 lockinit(&ap->ap_sim_lock, "ahcicam", 0, LK_CANRECURSE);
248 lockinit(&ap->ap_sig_lock, "ahport", 0, 0);
249 sysctl_ctx_init(&ap->sysctl_ctx);
250 ksnprintf(name, sizeof(name), "%d", ap->ap_num);
251 soid = device_get_sysctl_tree(ap->ap_sc->sc_dev);
252 ap->sysctl_tree = SYSCTL_ADD_NODE(&ap->sysctl_ctx,
253 SYSCTL_CHILDREN(soid),
254 OID_AUTO, name, CTLFLAG_RD, 0, "");
256 if ((ap->ap_sc->sc_cap & AHCI_REG_CAP_SALP) &&
257 (ap->ap_sc->sc_cap & (AHCI_REG_CAP_PSC | AHCI_REG_CAP_SSC))) {
258 SYSCTL_ADD_PROC(&ap->sysctl_ctx,
259 SYSCTL_CHILDREN(ap->sysctl_tree), OID_AUTO,
260 "link_pwr_mgmt", CTLTYPE_INT | CTLFLAG_RW, ap, 0,
261 ahci_sysctl_link_pwr_mgmt, "I",
262 "Link power management policy "
263 "(0 = disabled, 1 = medium, 2 = aggressive)");
264 SYSCTL_ADD_PROC(&ap->sysctl_ctx,
265 SYSCTL_CHILDREN(ap->sysctl_tree), OID_AUTO,
266 "link_pwr_state", CTLTYPE_STRING | CTLFLAG_RD, ap, 0,
267 ahci_sysctl_link_pwr_state, "A",
268 "Link power management state");
272 kthread_create(ahci_port_thread, ap, &ap->ap_thread,
277 * Stop the OS-specific port helper thread and kill the per-port lock.
280 ahci_os_stop_port(struct ahci_port *ap)
282 if (ap->sysctl_tree) {
283 sysctl_ctx_free(&ap->sysctl_ctx);
284 ap->sysctl_tree = NULL;
288 ahci_os_signal_port_thread(ap, AP_SIGF_STOP);
291 kprintf("%s: Waiting for thread to terminate\n",
293 while (ap->ap_thread)
295 kprintf("%s: thread terminated\n",
299 lockuninit(&ap->ap_lock);
303 * Add (mask) to the set of bits being sent to the per-port thread helper
304 * and wake the helper up if necessary.
307 ahci_os_signal_port_thread(struct ahci_port *ap, int mask)
309 lockmgr(&ap->ap_sig_lock, LK_EXCLUSIVE);
310 atomic_set_int(&ap->ap_signal, mask);
311 lockmgr(&ap->ap_sig_lock, LK_RELEASE);
312 wakeup(&ap->ap_thread);
316 * Unconditionally lock the port structure for access.
319 ahci_os_lock_port(struct ahci_port *ap)
321 lockmgr(&ap->ap_lock, LK_EXCLUSIVE);
325 * Conditionally lock the port structure for access.
327 * Returns 0 on success, non-zero on failure.
330 ahci_os_lock_port_nb(struct ahci_port *ap)
332 return (lockmgr(&ap->ap_lock, LK_EXCLUSIVE | LK_NOWAIT));
336 * Unlock a previously locked port.
339 ahci_os_unlock_port(struct ahci_port *ap)
341 lockmgr(&ap->ap_lock, LK_RELEASE);
345 * Per-port thread helper. This helper thread is responsible for
346 * atomically retrieving and clearing the signal mask and calling
347 * the machine-independant driver core.
353 ahci_port_thread(void *arg)
355 struct ahci_port *ap = arg;
359 * Sets us up as an interrupt support thread, meaning we are
360 * given a higher priority and we can preempt normal threads.
362 lwkt_set_interrupt_support_thread();
365 * The helper thread is responsible for the initial port init,
366 * so all the ports can be inited in parallel.
368 * We also run the state machine which should do all probes.
369 * Since CAM is not attached yet we will not get out-of-order
372 ahci_os_lock_port(ap);
374 atomic_clear_int(&ap->ap_signal, AP_SIGF_THREAD_SYNC);
375 wakeup(&ap->ap_signal);
376 ahci_port_state_machine(ap, 1);
377 ahci_os_unlock_port(ap);
378 atomic_clear_int(&ap->ap_signal, AP_SIGF_INIT);
379 wakeup(&ap->ap_signal);
382 * Then loop on the helper core.
384 mask = ap->ap_signal;
385 while ((mask & AP_SIGF_STOP) == 0) {
386 ahci_port_thread_core(ap, mask);
387 lockmgr(&ap->ap_sig_lock, LK_EXCLUSIVE);
388 if (ap->ap_signal == 0) {
389 lksleep(&ap->ap_thread, &ap->ap_sig_lock, 0,
392 mask = ap->ap_signal;
393 atomic_clear_int(&ap->ap_signal, mask);
394 lockmgr(&ap->ap_sig_lock, LK_RELEASE);
396 ap->ap_thread = NULL;