2018-06-21 14:26:43 +00:00
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018 Justin Hibbits
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <dev/ofw/openfirm.h>
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#include "cpufreq_if.h"
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static int pstate_ids[256];
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static int pstate_freqs[256];
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static int npstates;
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static void parse_pstates(void)
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{
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phandle_t node;
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node = OF_finddevice("/ibm,opal/power-mgt");
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/* If this fails, npstates will remain 0, and any attachment will bail. */
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if (node == -1)
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return;
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npstates = OF_getencprop(node, "ibm,pstate-ids", pstate_ids,
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sizeof(pstate_ids));
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if (npstates < 0) {
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npstates = 0;
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return;
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}
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if (OF_getencprop(node, "ibm,pstate-frequencies-mhz", pstate_freqs,
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sizeof(pstate_freqs)) != npstates) {
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npstates = 0;
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return;
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}
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npstates /= sizeof(cell_t);
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}
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/* Make this a sysinit so it runs before the cpufreq driver attaches. */
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SYSINIT(parse_pstates, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, parse_pstates, NULL);
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#define PMCR_UPPERPS_MASK 0xff00000000000000UL
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#define PMCR_UPPERPS_SHIFT 56
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#define PMCR_LOWERPS_MASK 0x00ff000000000000UL
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#define PMCR_LOWERPS_SHIFT 48
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#define PMCR_VERSION_MASK 0x0000000f
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#define PMCR_VERSION_1 1
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struct pmcr_softc {
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device_t dev;
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};
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static void pmcr_identify(driver_t *driver, device_t parent);
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static int pmcr_probe(device_t dev);
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static int pmcr_attach(device_t dev);
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static int pmcr_settings(device_t dev, struct cf_setting *sets, int *count);
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static int pmcr_set(device_t dev, const struct cf_setting *set);
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static int pmcr_get(device_t dev, struct cf_setting *set);
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static int pmcr_type(device_t dev, int *type);
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static device_method_t pmcr_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, pmcr_identify),
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DEVMETHOD(device_probe, pmcr_probe),
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DEVMETHOD(device_attach, pmcr_attach),
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/* cpufreq interface */
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DEVMETHOD(cpufreq_drv_set, pmcr_set),
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DEVMETHOD(cpufreq_drv_get, pmcr_get),
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DEVMETHOD(cpufreq_drv_type, pmcr_type),
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DEVMETHOD(cpufreq_drv_settings, pmcr_settings),
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{0, 0}
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};
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static driver_t pmcr_driver = {
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"pmcr",
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pmcr_methods,
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sizeof(struct pmcr_softc)
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};
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2022-04-19 21:08:04 +00:00
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DRIVER_MODULE(pmcr, cpu, pmcr_driver, 0, 0);
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2018-06-21 14:26:43 +00:00
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static void
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pmcr_identify(driver_t *driver, device_t parent)
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{
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/* Make sure we're not being doubly invoked. */
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if (device_find_child(parent, "pmcr", -1) != NULL)
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return;
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/*
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* We attach a child for every CPU since settings need to
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* be performed on every CPU in the SMP case.
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*/
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if (BUS_ADD_CHILD(parent, 10, "pmcr", -1) == NULL)
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device_printf(parent, "add pmcr child failed\n");
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}
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static int
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pmcr_probe(device_t dev)
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{
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if (resource_disabled("pmcr", 0))
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return (ENXIO);
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if (npstates == 0)
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return (ENXIO);
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device_set_desc(dev, "Power Management Control Register");
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return (0);
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}
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static int
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pmcr_attach(device_t dev)
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{
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struct pmcr_softc *sc;
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sc = device_get_softc(dev);
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sc->dev = dev;
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cpufreq_register(dev);
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return (0);
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}
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static int
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pmcr_settings(device_t dev, struct cf_setting *sets, int *count)
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{
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int i;
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if (sets == NULL || count == NULL)
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return (EINVAL);
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if (*count < npstates)
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return (E2BIG);
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/* Return a list of valid settings for this driver. */
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memset(sets, CPUFREQ_VAL_UNKNOWN, sizeof(*sets) * npstates);
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for (i = 0; i < npstates; i++) {
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sets[i].freq = pstate_freqs[i];
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sets[i].spec[0] = pstate_ids[i];
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pmcr: Fix pstate setting on Power8
Fix p-state setting on Power8 by removing the accidental double-indirection of
the pstate_ids table.
The pstate_ids table comes from the OF property "ibm,pstate-ids." On Power9,
the values happen to be identical to the indices, so the extra indirection was
harmless. On Power8, the values were out of the range [0, npstates], so
pmcr_set() would fail the spec[0] range check with EINVAL.
While here, include both the value and index in the driver-specific register
array as spec[0] and spec[1] respectively. They're redundant, but relatively
harmless, and it may aid debugging.
While here, fix the range check to exclude the index npstates, which is one
past the last valid index.
PR: 233693
Reported and tested by: sbruno
Reviewed by: jhibbits
2018-12-01 21:37:47 +00:00
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sets[i].spec[1] = i;
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2018-06-21 14:26:43 +00:00
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sets[i].dev = dev;
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}
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*count = npstates;
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return (0);
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}
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static int
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pmcr_set(device_t dev, const struct cf_setting *set)
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{
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register_t pmcr;
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2020-09-01 21:20:08 +00:00
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2018-06-21 14:26:43 +00:00
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if (set == NULL)
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return (EINVAL);
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pmcr: Fix pstate setting on Power8
Fix p-state setting on Power8 by removing the accidental double-indirection of
the pstate_ids table.
The pstate_ids table comes from the OF property "ibm,pstate-ids." On Power9,
the values happen to be identical to the indices, so the extra indirection was
harmless. On Power8, the values were out of the range [0, npstates], so
pmcr_set() would fail the spec[0] range check with EINVAL.
While here, include both the value and index in the driver-specific register
array as spec[0] and spec[1] respectively. They're redundant, but relatively
harmless, and it may aid debugging.
While here, fix the range check to exclude the index npstates, which is one
past the last valid index.
PR: 233693
Reported and tested by: sbruno
Reviewed by: jhibbits
2018-12-01 21:37:47 +00:00
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if (set->spec[1] < 0 || set->spec[1] >= npstates)
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2018-06-21 14:26:43 +00:00
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return (EINVAL);
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pmcr: Fix pstate setting on Power8
Fix p-state setting on Power8 by removing the accidental double-indirection of
the pstate_ids table.
The pstate_ids table comes from the OF property "ibm,pstate-ids." On Power9,
the values happen to be identical to the indices, so the extra indirection was
harmless. On Power8, the values were out of the range [0, npstates], so
pmcr_set() would fail the spec[0] range check with EINVAL.
While here, include both the value and index in the driver-specific register
array as spec[0] and spec[1] respectively. They're redundant, but relatively
harmless, and it may aid debugging.
While here, fix the range check to exclude the index npstates, which is one
past the last valid index.
PR: 233693
Reported and tested by: sbruno
Reviewed by: jhibbits
2018-12-01 21:37:47 +00:00
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pmcr = ((long)set->spec[0] << PMCR_LOWERPS_SHIFT) & PMCR_LOWERPS_MASK;
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pmcr |= ((long)set->spec[0] << PMCR_UPPERPS_SHIFT) & PMCR_UPPERPS_MASK;
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2018-06-21 14:26:43 +00:00
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pmcr |= PMCR_VERSION_1;
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mtspr(SPR_PMCR, pmcr);
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powerpc_sync(); isync();
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return (0);
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}
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static int
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pmcr_get(device_t dev, struct cf_setting *set)
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{
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register_t pmcr;
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int i, pstate;
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if (set == NULL)
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return (EINVAL);
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memset(set, CPUFREQ_VAL_UNKNOWN, sizeof(*set));
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pmcr = mfspr(SPR_PMCR);
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pstate = (pmcr & PMCR_LOWERPS_MASK) >> PMCR_LOWERPS_SHIFT;
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for (i = 0; i < npstates && pstate_ids[i] != pstate; i++)
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;
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if (i == npstates)
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return (EINVAL);
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set->spec[0] = pstate;
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pmcr: Fix pstate setting on Power8
Fix p-state setting on Power8 by removing the accidental double-indirection of
the pstate_ids table.
The pstate_ids table comes from the OF property "ibm,pstate-ids." On Power9,
the values happen to be identical to the indices, so the extra indirection was
harmless. On Power8, the values were out of the range [0, npstates], so
pmcr_set() would fail the spec[0] range check with EINVAL.
While here, include both the value and index in the driver-specific register
array as spec[0] and spec[1] respectively. They're redundant, but relatively
harmless, and it may aid debugging.
While here, fix the range check to exclude the index npstates, which is one
past the last valid index.
PR: 233693
Reported and tested by: sbruno
Reviewed by: jhibbits
2018-12-01 21:37:47 +00:00
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set->spec[1] = i;
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2018-06-21 14:26:43 +00:00
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set->freq = pstate_freqs[i];
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set->dev = dev;
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return (0);
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}
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static int
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pmcr_type(device_t dev, int *type)
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{
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if (type == NULL)
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return (EINVAL);
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*type = CPUFREQ_TYPE_ABSOLUTE;
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return (0);
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}
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