/*- * Copyright (c) 2003-2005 Nate Lawson (SDG) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "opt_acpi.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "cpufreq_if.h" /* * Support for ACPI processor performance states (Px) according to * section 8.3.3 of the ACPI 2.0c specification. */ struct acpi_px { uint32_t core_freq; uint32_t power; uint32_t trans_lat; uint32_t bm_lat; uint32_t ctrl_val; uint32_t sts_val; }; /* Offsets in struct cf_setting array for storing driver-specific values. */ #define PX_SPEC_CONTROL 0 #define PX_SPEC_STATUS 1 #define MAX_PX_STATES 16 struct acpi_perf_softc { device_t dev; ACPI_HANDLE handle; struct resource *perf_ctrl; /* Set new performance state. */ int perf_ctrl_type; /* Resource type for perf_ctrl. */ struct resource *perf_status; /* Check that transition succeeded. */ int perf_sts_type; /* Resource type for perf_status. */ struct acpi_px *px_states; /* ACPI perf states. */ uint32_t px_count; /* Total number of perf states. */ uint32_t px_max_avail; /* Lowest index state available. */ int px_curr_state; /* Active state index. */ int px_rid; int info_only; /* Can we set new states? */ }; #define PX_GET_REG(reg) \ (bus_space_read_4(rman_get_bustag((reg)), \ rman_get_bushandle((reg)), 0)) #define PX_SET_REG(reg, val) \ (bus_space_write_4(rman_get_bustag((reg)), \ rman_get_bushandle((reg)), 0, (val))) #define ACPI_NOTIFY_PERF_STATES 0x80 /* _PSS changed. */ static void acpi_perf_identify(driver_t *driver, device_t parent); static int acpi_perf_probe(device_t dev); static int acpi_perf_attach(device_t dev); static int acpi_perf_detach(device_t dev); static int acpi_perf_evaluate(device_t dev); static int acpi_px_to_set(device_t dev, struct acpi_px *px, struct cf_setting *set); static void acpi_px_available(struct acpi_perf_softc *sc); static void acpi_px_startup(void *arg); static void acpi_px_notify(ACPI_HANDLE h, UINT32 notify, void *context); static int acpi_px_settings(device_t dev, struct cf_setting *sets, int *count); static int acpi_px_set(device_t dev, const struct cf_setting *set); static int acpi_px_get(device_t dev, struct cf_setting *set); static int acpi_px_type(device_t dev, int *type); static device_method_t acpi_perf_methods[] = { /* Device interface */ DEVMETHOD(device_identify, acpi_perf_identify), DEVMETHOD(device_probe, acpi_perf_probe), DEVMETHOD(device_attach, acpi_perf_attach), DEVMETHOD(device_detach, acpi_perf_detach), /* cpufreq interface */ DEVMETHOD(cpufreq_drv_set, acpi_px_set), DEVMETHOD(cpufreq_drv_get, acpi_px_get), DEVMETHOD(cpufreq_drv_type, acpi_px_type), DEVMETHOD(cpufreq_drv_settings, acpi_px_settings), {0, 0} }; static driver_t acpi_perf_driver = { "acpi_perf", acpi_perf_methods, sizeof(struct acpi_perf_softc), }; static devclass_t acpi_perf_devclass; DRIVER_MODULE(acpi_perf, cpu, acpi_perf_driver, acpi_perf_devclass, 0, 0); MODULE_DEPEND(acpi_perf, acpi, 1, 1, 1); MALLOC_DEFINE(M_ACPIPERF, "acpi_perf", "ACPI Performance states"); static void acpi_perf_identify(driver_t *driver, device_t parent) { ACPI_HANDLE handle; device_t dev; /* Make sure we're not being doubly invoked. */ if (device_find_child(parent, "acpi_perf", -1) != NULL) return; /* Get the handle for the Processor object and check for perf states. */ handle = acpi_get_handle(parent); if (handle == NULL) return; if (ACPI_FAILURE(AcpiEvaluateObject(handle, "_PSS", NULL, NULL))) return; /* * Add a child to every CPU that has the right methods. In future * versions of the ACPI spec, CPUs can have different settings. * We probe this child now so that other devices that depend * on it (i.e., for info about supported states) will see it. */ if ((dev = BUS_ADD_CHILD(parent, 0, "acpi_perf", -1)) != NULL) device_probe_and_attach(dev); else device_printf(parent, "add acpi_perf child failed\n"); } static int acpi_perf_probe(device_t dev) { ACPI_HANDLE handle; ACPI_OBJECT *pkg; struct resource *res; ACPI_BUFFER buf; int error, rid, type; if (resource_disabled("acpi_perf", 0)) return (ENXIO); /* * Check the performance state registers. If they are of type * "functional fixed hardware", we attach quietly since we will * only be providing information on settings to other drivers. */ error = ENXIO; handle = acpi_get_handle(dev); buf.Pointer = NULL; buf.Length = ACPI_ALLOCATE_BUFFER; if (ACPI_FAILURE(AcpiEvaluateObject(handle, "_PCT", NULL, &buf))) return (error); pkg = (ACPI_OBJECT *)buf.Pointer; if (ACPI_PKG_VALID(pkg, 2)) { rid = 0; error = acpi_PkgGas(dev, pkg, 0, &type, &rid, &res); switch (error) { case 0: bus_release_resource(dev, type, rid, res); bus_delete_resource(dev, type, rid); device_set_desc(dev, "ACPI CPU Frequency Control"); break; case EOPNOTSUPP: device_quiet(dev); error = 0; break; } } AcpiOsFree(buf.Pointer); return (error); } static int acpi_perf_attach(device_t dev) { struct acpi_perf_softc *sc; sc = device_get_softc(dev); sc->dev = dev; sc->handle = acpi_get_handle(dev); sc->px_max_avail = 0; sc->px_curr_state = CPUFREQ_VAL_UNKNOWN; if (acpi_perf_evaluate(dev) != 0) return (ENXIO); AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_px_startup, NULL); if (!sc->info_only) cpufreq_register(dev); return (0); } static int acpi_perf_detach(device_t dev) { /* TODO: teardown registers, remove notify handler. */ return (ENXIO); } /* Probe and setup any valid performance states (Px). */ static int acpi_perf_evaluate(device_t dev) { struct acpi_perf_softc *sc; ACPI_BUFFER buf; ACPI_OBJECT *pkg, *res; ACPI_STATUS status; int count, error, i, j; static int once = 1; uint32_t *p; /* Get the control values and parameters for each state. */ error = ENXIO; sc = device_get_softc(dev); buf.Pointer = NULL; buf.Length = ACPI_ALLOCATE_BUFFER; status = AcpiEvaluateObject(sc->handle, "_PSS", NULL, &buf); if (ACPI_FAILURE(status)) return (ENXIO); pkg = (ACPI_OBJECT *)buf.Pointer; if (!ACPI_PKG_VALID(pkg, 1)) { device_printf(dev, "invalid top level _PSS package\n"); goto out; } sc->px_count = pkg->Package.Count; sc->px_states = malloc(sc->px_count * sizeof(struct acpi_px), M_ACPIPERF, M_WAITOK | M_ZERO); if (sc->px_states == NULL) goto out; /* * Each state is a package of {CoreFreq, Power, TransitionLatency, * BusMasterLatency, ControlVal, StatusVal}, sorted from highest * performance to lowest. */ count = 0; for (i = 0; i < sc->px_count; i++) { res = &pkg->Package.Elements[i]; if (!ACPI_PKG_VALID(res, 6)) { if (once) { once = 0; device_printf(dev, "invalid _PSS package\n"); } continue; } /* Parse the rest of the package into the struct. */ p = &sc->px_states[count].core_freq; for (j = 0; j < 6; j++, p++) acpi_PkgInt32(res, j, p); /* * Check for some impossible frequencies that some systems * use to indicate they don't actually support this Px state. */ if (sc->px_states[count].core_freq == 0 || sc->px_states[count].core_freq == 9999 || sc->px_states[count].core_freq == 0x9999 || sc->px_states[count].core_freq >= 0xffff) continue; count++; } sc->px_count = count; /* No valid Px state found so give up. */ if (count == 0) goto out; AcpiOsFree(buf.Pointer); /* Get the control and status registers (one of each). */ buf.Pointer = NULL; buf.Length = ACPI_ALLOCATE_BUFFER; status = AcpiEvaluateObject(sc->handle, "_PCT", NULL, &buf); if (ACPI_FAILURE(status)) goto out; /* Check the package of two registers, each a Buffer in GAS format. */ pkg = (ACPI_OBJECT *)buf.Pointer; if (!ACPI_PKG_VALID(pkg, 2)) { device_printf(dev, "invalid perf register package\n"); goto out; } error = acpi_PkgGas(sc->dev, pkg, 0, &sc->perf_ctrl_type, &sc->px_rid, &sc->perf_ctrl); if (error) { /* * If the register is of type FFixedHW, we can only return * info, we can't get or set new settings. */ if (error == EOPNOTSUPP) { sc->info_only = TRUE; error = 0; } else device_printf(dev, "failed in PERF_CTL attach\n"); goto out; } sc->px_rid++; error = acpi_PkgGas(sc->dev, pkg, 1, &sc->perf_sts_type, &sc->px_rid, &sc->perf_status); if (error) { if (error == EOPNOTSUPP) { sc->info_only = TRUE; error = 0; } else device_printf(dev, "failed in PERF_STATUS attach\n"); goto out; } sc->px_rid++; /* Get our current limit and register for notifies. */ acpi_px_available(sc); AcpiInstallNotifyHandler(sc->handle, ACPI_DEVICE_NOTIFY, acpi_px_notify, sc); error = 0; out: if (error) { if (sc->px_states) { free(sc->px_states, M_ACPIPERF); sc->px_states = NULL; } if (sc->perf_ctrl) { bus_release_resource(sc->dev, sc->perf_ctrl_type, 0, sc->perf_ctrl); bus_delete_resource(sc->dev, sc->perf_ctrl_type, 0); sc->perf_ctrl = NULL; } if (sc->perf_status) { bus_release_resource(sc->dev, sc->perf_sts_type, 1, sc->perf_status); bus_delete_resource(sc->dev, sc->perf_sts_type, 1); sc->perf_status = NULL; } sc->px_rid = 0; sc->px_count = 0; } if (buf.Pointer) AcpiOsFree(buf.Pointer); return (error); } static void acpi_px_startup(void *arg) { /* Signal to the platform that we are taking over CPU control. */ if (AcpiGbl_FADT->PstateCnt == 0) return; ACPI_LOCK(acpi); AcpiOsWritePort(AcpiGbl_FADT->SmiCmd, AcpiGbl_FADT->PstateCnt, 8); ACPI_UNLOCK(acpi); } static void acpi_px_notify(ACPI_HANDLE h, UINT32 notify, void *context) { struct acpi_perf_softc *sc; sc = context; if (notify != ACPI_NOTIFY_PERF_STATES) return; acpi_px_available(sc); /* TODO: Implement notification when frequency changes. */ } /* * Find the highest currently-supported performance state. * This can be called at runtime (e.g., due to a docking event) at * the request of a Notify on the processor object. */ static void acpi_px_available(struct acpi_perf_softc *sc) { ACPI_STATUS status; struct cf_setting set; status = acpi_GetInteger(sc->handle, "_PPC", &sc->px_max_avail); /* If the old state is too high, set current state to the new max. */ if (ACPI_SUCCESS(status)) { if (sc->px_curr_state != CPUFREQ_VAL_UNKNOWN && sc->px_curr_state > sc->px_max_avail) { acpi_px_to_set(sc->dev, &sc->px_states[sc->px_max_avail], &set); acpi_px_set(sc->dev, &set); } } else sc->px_max_avail = 0; } static int acpi_px_to_set(device_t dev, struct acpi_px *px, struct cf_setting *set) { if (px == NULL || set == NULL) return (EINVAL); set->freq = px->core_freq; set->power = px->power; /* XXX Include BM latency too? */ set->lat = px->trans_lat; set->volts = CPUFREQ_VAL_UNKNOWN; set->dev = dev; set->spec[PX_SPEC_CONTROL] = px->ctrl_val; set->spec[PX_SPEC_STATUS] = px->sts_val; return (0); } static int acpi_px_settings(device_t dev, struct cf_setting *sets, int *count) { struct acpi_perf_softc *sc; int x, y; sc = device_get_softc(dev); if (sets == NULL || count == NULL) return (EINVAL); if (*count < sc->px_count - sc->px_max_avail) return (E2BIG); /* Return a list of settings that are currently valid. */ y = 0; for (x = sc->px_max_avail; x < sc->px_count; x++, y++) acpi_px_to_set(dev, &sc->px_states[x], &sets[y]); *count = sc->px_count - sc->px_max_avail; return (0); } static int acpi_px_set(device_t dev, const struct cf_setting *set) { struct acpi_perf_softc *sc; int i, status, sts_val, tries; if (set == NULL) return (EINVAL); sc = device_get_softc(dev); /* If we can't set new states, return immediately. */ if (sc->info_only) return (ENXIO); /* Look up appropriate state, based on frequency. */ for (i = sc->px_max_avail; i < sc->px_count; i++) { if (CPUFREQ_CMP(set->freq, sc->px_states[i].core_freq)) break; } if (i == sc->px_count) return (EINVAL); /* Write the appropriate value to the register. */ PX_SET_REG(sc->perf_ctrl, sc->px_states[i].ctrl_val); /* * Try for up to 10 ms to verify the desired state was selected. * This is longer than the standard says (1 ms) but in some modes, * systems may take longer to respond. */ sts_val = sc->px_states[i].sts_val; for (tries = 0; tries < 1000; tries++) { status = PX_GET_REG(sc->perf_status); /* * If we match the status or the desired status is 8 bits * and matches the relevant bits, assume we succeeded. It * appears some systems (IBM R32) expect byte-wide access * even though the standard says the register is 32-bit. */ if (status == sts_val || ((sts_val & ~0xff) == 0 && (status & 0xff) == sts_val)) break; DELAY(10); } if (tries == 1000) { device_printf(dev, "Px transition to %d failed\n", sc->px_states[i].core_freq); return (ENXIO); } sc->px_curr_state = i; return (0); } static int acpi_px_get(device_t dev, struct cf_setting *set) { struct acpi_perf_softc *sc; uint64_t rate; int i; struct pcpu *pc; if (set == NULL) return (EINVAL); sc = device_get_softc(dev); /* If we can't get new states, return immediately. */ if (sc->info_only) return (ENXIO); /* If we've set the rate before, use the cached value. */ if (sc->px_curr_state != CPUFREQ_VAL_UNKNOWN) { acpi_px_to_set(dev, &sc->px_states[sc->px_curr_state], set); return (0); } /* Otherwise, estimate and try to match against our settings. */ pc = cpu_get_pcpu(dev); if (pc == NULL) return (ENXIO); cpu_est_clockrate(pc->pc_cpuid, &rate); rate /= 1000000; for (i = 0; i < sc->px_count; i++) { if (CPUFREQ_CMP(sc->px_states[i].core_freq, rate)) { sc->px_curr_state = i; acpi_px_to_set(dev, &sc->px_states[i], set); break; } } /* No match, give up. */ if (i == sc->px_count) { sc->px_curr_state = CPUFREQ_VAL_UNKNOWN; set->freq = CPUFREQ_VAL_UNKNOWN; } return (0); } static int acpi_px_type(device_t dev, int *type) { struct acpi_perf_softc *sc; if (type == NULL) return (EINVAL); sc = device_get_softc(dev); *type = CPUFREQ_TYPE_ABSOLUTE; if (sc->info_only) *type |= CPUFREQ_FLAG_INFO_ONLY; return (0); }