diff options
Diffstat (limited to 'sys/dev/pci/ksmn.c')
| -rw-r--r-- | sys/dev/pci/ksmn.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/sys/dev/pci/ksmn.c b/sys/dev/pci/ksmn.c new file mode 100644 index 00000000000..cd43125fb31 --- /dev/null +++ b/sys/dev/pci/ksmn.c @@ -0,0 +1,166 @@ +/* $OpenBSD: ksmn.c,v 1.1 2019/09/26 12:59:01 brynet Exp $ */ + +/* + * Copyright (c) 2019 Bryan Steele <brynet@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/device.h> +#include <sys/sensors.h> + +#include <machine/bus.h> + +#include <dev/pci/pcivar.h> +#include <dev/pci/pcidevs.h> + +/* + * AMD temperature sensors on Family 17h (and some 15h) must be + * read from the System Management Unit (SMU) co-processor over + * the System Management Network (SMN). + */ + +#define SMN_17H_ADDR_R 0x60 +#define SMN_17H_DATA_R 0x64 + +/* + * AMD Family 17h SMU Thermal Registers (THM) + * + * 4.2.1, OSRR (Open-Source Register Reference) Guide for Family 17h + * [31:21] Current reported temperature. + */ +#define SMU_17H_THM 0x59800 +#define GET_CURTMP(r) (((r) >> 21) & 0x7ff) + +/* + * Bit 19 set: "Report on -49C to 206C scale range." + * clear: "Report on 0C to 225C (255C?) scale range." + */ +#define CURTMP_17H_RANGE_SEL (1 << 19) +#define CURTMP_17H_RANGE_ADJUST 490 + +/* + * Undocumented tCTL offsets gleamed from Linux k10temp driver. + */ +struct curtmp_offset { + const char *const cpu_model; + int tctl_offset; +} cpu_model_offsets[] = { + { "AMD Ryzen 5 1600X", 200 }, + { "AMD Ryzen 7 1700X", 200 }, + { "AMD Ryzen 7 1800X", 200 }, + { "AMD Ryzen 7 2700X", 100 }, + { "AMD Ryzen Threadripper 19", 270 }, /* many models */ + { "AMD Ryzen Threadripper 29", 270 }, /* many models */ + /* ... */ + { NULL, 0 }, +}; + +struct ksmn_softc { + struct device sc_dev; + + pci_chipset_tag_t sc_pc; + pcitag_t sc_pcitag; + + int sc_tctl_offset; + + struct ksensor sc_sensor; + struct ksensordev sc_sensordev; +}; + +int ksmn_match(struct device *, void *, void *); +void ksmn_attach(struct device *, struct device *, void *); +void ksmn_refresh(void *); + +struct cfattach ksmn_ca = { + sizeof(struct ksmn_softc), ksmn_match, ksmn_attach +}; + +struct cfdriver ksmn_cd = { + NULL, "ksmn", DV_DULL +}; + +static const struct pci_matchid ksmn_devices[] = { + { PCI_VENDOR_AMD, PCI_PRODUCT_AMD_AMD64_17_RC }, + { PCI_VENDOR_AMD, PCI_PRODUCT_AMD_AMD64_17_1X_RC }, + { PCI_VENDOR_AMD, PCI_PRODUCT_AMD_AMD64_17_3X_RC } +}; + +int +ksmn_match(struct device *parent, void *match, void *aux) +{ + /* successful match supersedes pchb(4) */ + return pci_matchbyid((struct pci_attach_args *)aux, ksmn_devices, + sizeof(ksmn_devices) / sizeof(ksmn_devices[0])) * 2; +} + +void +ksmn_attach(struct device *parent, struct device *self, void *aux) +{ + struct ksmn_softc *sc = (struct ksmn_softc *)self; + struct pci_attach_args *pa = aux; + struct curtmp_offset *p; + extern char cpu_model[]; + + sc->sc_pc = pa->pa_pc; + sc->sc_pcitag = pa->pa_tag; + + strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname, + sizeof(sc->sc_sensordev.xname)); + + sc->sc_sensor.type = SENSOR_TEMP; + sensor_attach(&sc->sc_sensordev, &sc->sc_sensor); + + /* + * Zen/Zen+ CPUs are offset if TDP > 65, otherwise 0. + * Zen 2 models appear to have no tCTL offset, so always 0. + * + * XXX: Does any public documentation exist for this? + */ + for (p = cpu_model_offsets; p->cpu_model != NULL; p++) { + /* match partial string */ + if (!strncmp(cpu_model, p->cpu_model, strlen(p->cpu_model))) + sc->sc_tctl_offset = p->tctl_offset; + } + + if (sensor_task_register(sc, ksmn_refresh, 5) == NULL) { + printf(": unable to register update task\n"); + return; + } + + sensordev_install(&sc->sc_sensordev); + + printf("\n"); +} + +void +ksmn_refresh(void *arg) +{ + struct ksmn_softc *sc = arg; + struct ksensor *s = &sc->sc_sensor; + pcireg_t reg; + int c; + + pci_conf_write(sc->sc_pc, sc->sc_pcitag, SMN_17H_ADDR_R, + SMU_17H_THM); + reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, SMN_17H_DATA_R); + + c = GET_CURTMP(reg) * 5 / 4; /* 1.25 */ + if ((reg & CURTMP_17H_RANGE_SEL) != 0) + c -= CURTMP_17H_RANGE_ADJUST; + if (c > sc->sc_tctl_offset) + c -= sc->sc_tctl_offset; + s->value = c * 125000 + 273150000; +} |