diff options
author | msmith <msmith@FreeBSD.org> | 2001-07-07 10:27:17 +0000 |
---|---|---|
committer | msmith <msmith@FreeBSD.org> | 2001-07-07 10:27:17 +0000 |
commit | 69e8b198c501f15406c99c41c59ceb575aa9a374 (patch) | |
tree | c605e11361d7f8bc987c0698ec7d97dde1e859a1 /sys | |
parent | a9dfae497adb601087b346f63456c2b1f750b3a4 (diff) | |
download | FreeBSD-src-69e8b198c501f15406c99c41c59ceb575aa9a374.zip FreeBSD-src-69e8b198c501f15406c99c41c59ceb575aa9a374.tar.gz |
Kill the old processor driver; the ACPI CA functions it depended on
are not coming back any time soon. Implement a new 'acpi_cpu' driver
with support for CPU throttling and power policies.
Diffstat (limited to 'sys')
-rw-r--r-- | sys/conf/files | 2 | ||||
-rw-r--r-- | sys/dev/acpica/acpi_cpu.c | 388 | ||||
-rw-r--r-- | sys/dev/acpica/acpi_processor.c | 669 |
3 files changed, 389 insertions, 670 deletions
diff --git a/sys/conf/files b/sys/conf/files index 50f48e2..793fbdf 100644 --- a/sys/conf/files +++ b/sys/conf/files @@ -200,13 +200,13 @@ dev/acpica/acpi_acad.c optional acpica dev/acpica/acpi_battery.c optional acpica dev/acpica/acpi_button.c optional acpica dev/acpica/acpi_cmbat.c optional acpica +dev/acpica/acpi_cpu.c optional acpica dev/acpica/acpi_ec.c optional acpica dev/acpica/acpi_isa.c optional acpica isa dev/acpica/acpi_lid.c optional acpica dev/acpica/acpi_pcib.c optional acpica pci dev/acpica/acpi_powerres.c optional acpica dev/acpica/acpi_powerprofile.c optional acpica -#dev/acpica/acpi_processor.c optional acpica dev/acpica/acpi_resource.c optional acpica dev/acpica/acpi_thermal.c optional acpica dev/acpica/acpi_timer.c optional acpica diff --git a/sys/dev/acpica/acpi_cpu.c b/sys/dev/acpica/acpi_cpu.c new file mode 100644 index 0000000..0a6c6f3 --- /dev/null +++ b/sys/dev/acpica/acpi_cpu.c @@ -0,0 +1,388 @@ +/*- + * Copyright (c) 2001 Michael Smith + * 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. + * + * $FreeBSD$ + */ + +#include "opt_acpi.h" +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/bus.h> + +#include <machine/bus_pio.h> +#include <machine/bus.h> +#include <machine/resource.h> +#include <sys/rman.h> + +#include "acpi.h" + +#include <dev/acpica/acpivar.h> + +/* + * Support for ACPI Processor devices. + * + * Note that this only provides ACPI 1.0 support (with the exception of the + * PSTATE_CNT field). 2.0 support will involve implementing _PTC, _PCT, + * _PSS and _PPC. + */ + +/* + * Hooks for the ACPI CA debugging infrastructure + */ +#define _COMPONENT ACPI_PROCESSOR +MODULE_NAME("PROCESSOR") + +struct acpi_cpu_softc { + device_t cpu_dev; + ACPI_HANDLE cpu_handle; + + u_int32_t cpu_id; + + /* CPU throttling control register */ + struct resource *cpu_p_blk; +#define CPU_GET_P_CNT(sc) (bus_space_read_4(rman_get_bustag((sc)->cpu_p_blk), \ + rman_get_bushandle((sc)->cpu_p_blk), \ + 0)) +#define CPU_SET_P_CNT(sc, val) (bus_space_write_4(rman_get_bustag((sc)->cpu_p_blk), \ + rman_get_bushandle((sc)->cpu_p_blk), \ + 0, (val))) +#define CPU_P_CNT_THT_EN (1<<4) +}; + +/* + * Speeds are stored in counts, from 1 - CPU_MAX_SPEED, and + * reported to the user in tenths of a percent. + */ +static u_int32_t cpu_duty_offset; +static u_int32_t cpu_duty_width; +#define CPU_MAX_SPEED (1 << cpu_duty_width) +#define CPU_SPEED_PERCENT(x) ((1000 * (x)) / CPU_MAX_SPEED) +#define CPU_SPEED_PRINTABLE(x) (CPU_SPEED_PERCENT(x) / 10),(CPU_SPEED_PERCENT(x) % 10) + +static u_int32_t cpu_smi_cmd; /* should be a generic way to do this */ +static u_int8_t cpu_pstate_cnt; + +static u_int32_t cpu_current_state; +static u_int32_t cpu_performance_state; +static u_int32_t cpu_economy_state; +static u_int32_t cpu_max_state; + +static device_t *cpu_devices; +static int cpu_ndevices; + +static struct sysctl_ctx_list acpi_cpu_sysctl_ctx; +static struct sysctl_oid *acpi_cpu_sysctl_tree; + +static int acpi_cpu_probe(device_t dev); +static int acpi_cpu_attach(device_t dev); +static void acpi_cpu_init_throttling(void *arg); +static void acpi_cpu_set_speed(u_int32_t speed); +static void acpi_cpu_powerprofile(void *arg); +static int acpi_cpu_speed_sysctl(SYSCTL_HANDLER_ARGS); + +static device_method_t acpi_cpu_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, acpi_cpu_probe), + DEVMETHOD(device_attach, acpi_cpu_attach), + + {0, 0} +}; + +static driver_t acpi_cpu_driver = { + "acpi_cpu", + acpi_cpu_methods, + sizeof(struct acpi_cpu_softc), +}; + +devclass_t acpi_cpu_devclass; +DRIVER_MODULE(acpi_cpu, acpi, acpi_cpu_driver, acpi_cpu_devclass, 0, 0); + +static int +acpi_cpu_probe(device_t dev) +{ + if (acpi_get_type(dev) == ACPI_TYPE_PROCESSOR) { + device_set_desc(dev, "CPU"); /* XXX get more verbose description? */ + return(0); + } + return(ENXIO); +} + +static int +acpi_cpu_attach(device_t dev) +{ + struct acpi_cpu_softc *sc; + struct acpi_softc *acpi_sc; + ACPI_OBJECT processor; + ACPI_BUFFER buf; + ACPI_STATUS status; + u_int32_t p_blk; + u_int32_t p_blk_length; + u_int32_t duty_end; + int rid; + + FUNCTION_TRACE(__func__); + + ACPI_ASSERTLOCK; + + sc = device_get_softc(dev); + sc->cpu_dev = dev; + sc->cpu_handle = acpi_get_handle(dev); + + /* + * Get global parameters from the FADT. + */ + if (device_get_unit(sc->cpu_dev) == 0) { + /* get the FADT */ + if (ACPI_FAILURE(status = acpi_GetTableIntoBuffer(ACPI_TABLE_FADT, 1, &buf))) { + device_printf(sc->cpu_dev, "couldn't get FADT - %s\n", acpi_strerror(status)); + if (buf.Pointer != NULL) + AcpiOsFree(buf.Pointer); + return_VALUE(ENXIO); + } + cpu_duty_offset = ((FADT_DESCRIPTOR_REV2 *)buf.Pointer)->DutyOffset; + cpu_duty_width = ((FADT_DESCRIPTOR_REV2 *)buf.Pointer)->DutyWidth; + cpu_smi_cmd = ((FADT_DESCRIPTOR_REV1 *)buf.Pointer)->SmiCmd; + cpu_pstate_cnt = ((FADT_DESCRIPTOR_REV2 *)buf.Pointer)->PstateCnt; + AcpiOsFree(buf.Pointer); + + /* validate the offset/width */ + duty_end = cpu_duty_offset + cpu_duty_width - 1; + /* check that it fits */ + if (duty_end > 31) { + printf("acpi_cpu: CLK_VAL field overflows P_CNT register\n"); + cpu_duty_width = 0; + } + /* check for overlap with the THT_EN bit */ + if ((cpu_duty_offset <= 4) && (duty_end >= 4)) { + printf("acpi_cpu: CLK_VAL field overlaps THT_EN bit\n"); + cpu_duty_width = 0; + } + + /* + * Start the throttling process once the probe phase completes, if we think that + * it's going to be useful. If the duty width value is zero, there are no significant + * bits in the register and thus no throttled states. + */ + if (cpu_duty_width > 0) { + AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cpu_init_throttling, NULL); + + acpi_sc = acpi_device_get_parent_softc(dev); + sysctl_ctx_init(&acpi_cpu_sysctl_ctx); + acpi_cpu_sysctl_tree = SYSCTL_ADD_NODE(&acpi_cpu_sysctl_ctx, + SYSCTL_CHILDREN(acpi_sc->acpi_sysctl_tree), + OID_AUTO, "cpu", CTLFLAG_RD, 0, ""); + + SYSCTL_ADD_INT(&acpi_cpu_sysctl_ctx, SYSCTL_CHILDREN(acpi_cpu_sysctl_tree), + OID_AUTO, "max_speed", CTLFLAG_RD, + &cpu_max_state, 0, "maximum CPU speed"); + SYSCTL_ADD_INT(&acpi_cpu_sysctl_ctx, SYSCTL_CHILDREN(acpi_cpu_sysctl_tree), + OID_AUTO, "current_speed", CTLFLAG_RD, + &cpu_current_state, 0, "current CPU speed"); + SYSCTL_ADD_PROC(&acpi_cpu_sysctl_ctx, SYSCTL_CHILDREN(acpi_cpu_sysctl_tree), + OID_AUTO, "performance_speed", CTLTYPE_INT | CTLFLAG_RW, + &cpu_performance_state, 0, acpi_cpu_speed_sysctl, "I", ""); + SYSCTL_ADD_PROC(&acpi_cpu_sysctl_ctx, SYSCTL_CHILDREN(acpi_cpu_sysctl_tree), + OID_AUTO, "economy_speed", CTLTYPE_INT | CTLFLAG_RW, + &cpu_economy_state, 0, acpi_cpu_speed_sysctl, "I", ""); + } + } + + /* + * Get the processor object. + */ + buf.Pointer = &processor; + buf.Length = sizeof(processor); + if (ACPI_FAILURE(status = AcpiEvaluateObject(sc->cpu_handle, NULL, NULL, &buf))) { + device_printf(sc->cpu_dev, "couldn't get Processor object - %s\n", acpi_strerror(status)); + return_VALUE(ENXIO); + } + if (processor.Type != ACPI_TYPE_PROCESSOR) { + device_printf(sc->cpu_dev, "Processor object has bad type %d\n", processor.Type); + return_VALUE(ENXIO); + } + sc->cpu_id = processor.Processor.ProcId; + + /* + * If it looks like we support throttling, find this CPU's P_BLK. + * + * Note that some systems seem to duplicate the P_BLK pointer across + * multiple CPUs, so not getting the resource is not fatal. + * + * XXX should support _PTC here as well, once we work out how to parse it. + * + * XXX is it valid to assume that the P_BLK must be 6 bytes long? + */ + if (cpu_duty_width > 0) { + p_blk = processor.Processor.PblkAddress; + p_blk_length = processor.Processor.PblkLength; + + /* allocate bus space if possible */ + if ((p_blk > 0) && (p_blk_length == 6)) { + rid = 0; + bus_set_resource(sc->cpu_dev, SYS_RES_IOPORT, rid, p_blk, p_blk_length); + sc->cpu_p_blk = bus_alloc_resource(sc->cpu_dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, + RF_ACTIVE); + + DEBUG_PRINT(TRACE_IO, ("acpi_cpu%d: throttling with P_BLK at 0x%x/%d%s\n", + device_get_unit(sc->cpu_dev), p_blk, p_blk_length, + sc->cpu_p_blk ? "" : " (shadowed)"); + } + } + return_VALUE(0); +} + +/* + * Call this *after* all CPUs have been attached. + * + * Takes the ACPI lock to avoid fighting anyone over the SMI command + * port. Could probably lock less code. + */ +static void +acpi_cpu_init_throttling(void *arg) +{ + + ACPI_LOCK; + + /* get set of CPU devices */ + devclass_get_devices(acpi_cpu_devclass, &cpu_devices, &cpu_ndevices); + + /* initialise throttling states */ + cpu_max_state = CPU_MAX_SPEED; + cpu_performance_state = cpu_max_state; + cpu_economy_state = cpu_performance_state / 2; + if (cpu_economy_state == 0) /* 0 is 'reserved' */ + cpu_economy_state++; + + /* register performance profile change handler */ + EVENTHANDLER_REGISTER(powerprofile_change, acpi_cpu_powerprofile, NULL, 0); + + /* if ACPI 2.0+, signal platform that we are taking over throttling */ + if (cpu_pstate_cnt != 0) { + /* XXX should be a generic interface for this */ + AcpiOsOut8(cpu_smi_cmd, cpu_pstate_cnt); + } + + ACPI_UNLOCK; + + /* set initial speed */ + acpi_cpu_powerprofile(NULL); + + printf("acpi_cpu: CPU throttling enabled, %d steps from 100%% to %d.%d%%\n", + CPU_MAX_SPEED, CPU_SPEED_PRINTABLE(1)); +} + +/* + * Set CPUs to the new state. + * + * Must be called with the ACPI lock held. + */ +static void +acpi_cpu_set_speed(u_int32_t speed) +{ + struct acpi_cpu_softc *sc; + int i; + u_int32_t p_cnt, clk_val; + + ACPI_ASSERTLOCK; + + /* iterate over processors */ + for (i = 0; i < cpu_ndevices; i++) { + sc = device_get_softc(cpu_devices[i]); + if (sc->cpu_p_blk == NULL) + continue; + + /* get the current P_CNT value and disable throttling */ + p_cnt = CPU_GET_P_CNT(sc); + p_cnt &= ~CPU_P_CNT_THT_EN; + CPU_SET_P_CNT(sc, p_cnt); + + /* if we're at maximum speed, that's all */ + if (speed < CPU_MAX_SPEED) { + + /* mask the old CLK_VAL off and or-in the new value */ + clk_val = CPU_MAX_SPEED << cpu_duty_offset; + p_cnt &= ~clk_val; + p_cnt |= (speed << cpu_duty_offset); + + /* write the new P_CNT value and then enable throttling */ + CPU_SET_P_CNT(sc, p_cnt); + p_cnt |= CPU_P_CNT_THT_EN; + CPU_SET_P_CNT(sc, p_cnt); + } + device_printf(sc->cpu_dev, "set speed to %d.%d%%\n", CPU_SPEED_PRINTABLE(speed)); + } + cpu_current_state = speed; +} + +/* + * Power profile change hook. + * + * Uses the ACPI lock to avoid reentrancy. + */ +static void +acpi_cpu_powerprofile(void *arg) +{ + u_int32_t new; + + ACPI_LOCK; + + new = (powerprofile_get_state() == POWERPROFILE_PERFORMANCE) ? cpu_performance_state : cpu_economy_state; + if (cpu_current_state != new) + acpi_cpu_set_speed(new); + + ACPI_UNLOCK; +} + +/* + * Handle changes in the performance/ecomony CPU settings. + * + * Does not need the ACPI lock (although setting *argp should + * probably be atomic). + */ +static int +acpi_cpu_speed_sysctl(SYSCTL_HANDLER_ARGS) +{ + u_int32_t *argp; + u_int32_t arg; + int error; + + argp = (u_int32_t *)oidp->oid_arg1; + arg = *argp; + error = sysctl_handle_int(oidp, &arg, 0, req); + + /* error or no new value */ + if ((error != 0) || (req->newptr == NULL)) + return(error); + + /* range check */ + if ((arg < 1) || (arg >= cpu_max_state)) + return(EINVAL); + + /* set new value and possibly switch */ + *argp = arg; + acpi_cpu_powerprofile(NULL); + + return(0); +} diff --git a/sys/dev/acpica/acpi_processor.c b/sys/dev/acpica/acpi_processor.c deleted file mode 100644 index 1898602..0000000 --- a/sys/dev/acpica/acpi_processor.c +++ /dev/null @@ -1,669 +0,0 @@ -/*- - * Copyright (c) 2000 Michael Smith - * Copyright (c) 2000 BSDi - * 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. - * - * $FreeBSD$ - */ -/****************************************************************************** - * - * 1. Copyright Notice - * - * Some or all of this work - Copyright (c) 1999, Intel Corp. All rights - * reserved. - * - * 2. License - * - * 2.1. This is your license from Intel Corp. under its intellectual property - * rights. You may have additional license terms from the party that provided - * you this software, covering your right to use that party's intellectual - * property rights. - * - * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a - * copy of the source code appearing in this file ("Covered Code") an - * irrevocable, perpetual, worldwide license under Intel's copyrights in the - * base code distributed originally by Intel ("Original Intel Code") to copy, - * make derivatives, distribute, use and display any portion of the Covered - * Code in any form, with the right to sublicense such rights; and - * - * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent - * license (with the right to sublicense), under only those claims of Intel - * patents that are infringed by the Original Intel Code, to make, use, sell, - * offer to sell, and import the Covered Code and derivative works thereof - * solely to the minimum extent necessary to exercise the above copyright - * license, and in no event shall the patent license extend to any additions - * to or modifications of the Original Intel Code. No other license or right - * is granted directly or by implication, estoppel or otherwise; - * - * The above copyright and patent license is granted only if the following - * conditions are met: - * - * 3. Conditions - * - * 3.1. Redistribution of Source with Rights to Further Distribute Source. - * Redistribution of source code of any substantial portion of the Covered - * Code or modification with rights to further distribute source must include - * the above Copyright Notice, the above License, this list of Conditions, - * and the following Disclaimer and Export Compliance provision. In addition, - * Licensee must cause all Covered Code to which Licensee contributes to - * contain a file documenting the changes Licensee made to create that Covered - * Code and the date of any change. Licensee must include in that file the - * documentation of any changes made by any predecessor Licensee. Licensee - * must include a prominent statement that the modification is derived, - * directly or indirectly, from Original Intel Code. - * - * 3.2. Redistribution of Source with no Rights to Further Distribute Source. - * Redistribution of source code of any substantial portion of the Covered - * Code or modification without rights to further distribute source must - * include the following Disclaimer and Export Compliance provision in the - * documentation and/or other materials provided with distribution. In - * addition, Licensee may not authorize further sublicense of source of any - * portion of the Covered Code, and must include terms to the effect that the - * license from Licensee to its licensee is limited to the intellectual - * property embodied in the software Licensee provides to its licensee, and - * not to intellectual property embodied in modifications its licensee may - * make. - * - * 3.3. Redistribution of Executable. Redistribution in executable form of any - * substantial portion of the Covered Code or modification must reproduce the - * above Copyright Notice, and the following Disclaimer and Export Compliance - * provision in the documentation and/or other materials provided with the - * distribution. - * - * 3.4. Intel retains all right, title, and interest in and to the Original - * Intel Code. - * - * 3.5. Neither the name Intel nor any other trademark owned or controlled by - * Intel shall be used in advertising or otherwise to promote the sale, use or - * other dealings in products derived from or relating to the Covered Code - * without prior written authorization from Intel. - * - * 4. Disclaimer and Export Compliance - * - * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED - * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE - * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, - * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY - * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY - * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A - * PARTICULAR PURPOSE. - * - * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES - * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR - * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, - * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY - * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL - * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS - * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY - * LIMITED REMEDY. - * - * 4.3. Licensee shall not export, either directly or indirectly, any of this - * software or system incorporating such software without first obtaining any - * required license or other approval from the U. S. Department of Commerce or - * any other agency or department of the United States Government. In the - * event Licensee exports any such software from the United States or - * re-exports any such software from a foreign destination, Licensee shall - * ensure that the distribution and export/re-export of the software is in - * compliance with all laws, regulations, orders, or other restrictions of the - * U.S. Export Administration Regulations. Licensee agrees that neither it nor - * any of its subsidiaries will export/re-export any technical data, process, - * software, or service, directly or indirectly, to any country for which the - * United States government or any agency thereof requires an export license, - * other governmental approval, or letter of assurance, without first obtaining - * such license, approval or letter. - * - *****************************************************************************/ - -/* - * Processor driver. - * - * XXX Note that the power state code here is almost certainly suboptimal. - * We should go raid the Linux code for their ideas and experience. - * - * Code style here is a hairy mix of BSD-like and Intel-like. Should be - * sanitised at some point. - */ - -#include "opt_acpi.h" -#include <sys/param.h> -#include <sys/kernel.h> -#include <sys/bus.h> - -#include "acpi.h" - -#include <dev/acpica/acpivar.h> - -/* - * Hooks for the ACPI CA debugging infrastructure - */ -#define _COMPONENT ACPI_PROCESSOR_CONTROL -MODULE_NAME("PROCESSOR") - -#define PR_MAX_POWER_STATES 4 -#define PR_MAX_PERFORMANCE_STATES 8 -#define PR_MAX_THROTTLING_STATES 8 - -/* - * Processor Commands: - * ------------------- - */ -#define PR_COMMAND_GET_INFO ((BM_COMMAND) 0x80) -#define PR_COMMAND_SET_CX_STATE_INFO ((BM_COMMAND) 0x81) -#define PR_COMMAND_GET_THROTTLING_STATE ((BM_COMMAND) 0x82) -#define PR_COMMAND_SET_THROTTLING_STATE ((BM_COMMAND) 0x83) -#define PR_COMMAND_GET_PERF_STATE ((BM_COMMAND) 0x84) -#define PR_COMMAND_SET_PERF_STATE ((BM_COMMAND) 0x85) -#define PR_COMMAND_GET_CURRENT_FREQ ((BM_COMMAND) 0x86) - -/* - * PR_POWER_STATE: - * --------------- - */ -typedef u_int32_t PR_POWER_STATE; - -#define PR_POWER_STATE_UNKNOWN ((PR_POWER_STATE) 0xFFFFFFFF) - -#define PR_POWER_STATE_C0 ((PR_POWER_STATE) 0x00000000) -#define PR_POWER_STATE_C1 ((PR_POWER_STATE) 0x00000001) -#define PR_POWER_STATE_C2 ((PR_POWER_STATE) 0x00000002) -#define PR_POWER_STATE_C3 ((PR_POWER_STATE) 0x00000003) - -/* - * Processor Notifications: - * ------------------------ - */ -#define PR_NOTIFY_PERF_STATES_CHANGE ((BM_NOTIFY) 0x80) -#define PR_NOTIFY_POWER_STATES_CHANGE ((BM_NOTIFY) 0x81) - - -typedef struct -{ - u_int32_t TimeThreshold; - u_int32_t CountThreshold; - u_int32_t Count; - PR_POWER_STATE TargetState; -} PR_POLICY_VALUES; - -/* - * PR_CX_STATE_INFO: - * ----------------- - */ -typedef struct -{ - u_int32_t Latency; - u_int64_t Utilization; - PR_POLICY_VALUES PromotionPolicy; - PR_POLICY_VALUES DemotionPolicy; -} PR_CX_STATE_INFO; - -/* - * PR_POWER_INFO: - * -------------- - */ -typedef struct -{ - u_int32_t Count; - PR_POWER_STATE ActiveState; - PR_CX_STATE_INFO Info[PR_MAX_POWER_STATES]; -} PR_POWER_INFO; - -/* - * PR_PERFORMANCE_INFO: - * -------------------- - */ -typedef struct -{ - u_int32_t Count; - /* TODO... */ -} PR_PERFORMANCE_INFO; - -/* - * PR_THROTTLING_INFO: - * ------------------- - */ -typedef struct -{ - u_int32_t Count; - u_int32_t Percentage[PR_MAX_THROTTLING_STATES]; -} PR_THROTTLING_INFO; - -struct acpi_pr_softc { - device_t pr_dev; - ACPI_HANDLE pr_handle; - PR_POWER_INFO pr_PowerStates; - PR_PERFORMANCE_INFO pr_PerformanceStates; - PR_THROTTLING_INFO pr_ThrottlingStates; - eventhandler_tag pr_idleevent; - - /* local APIC data */ - PROCESSOR_APIC pr_lapic; -}; - -#define PR_MAGIC 0x20555043 /* "CPU " */ - -static void acpi_pr_identify(driver_t *driver, device_t bus); -static ACPI_STATUS acpi_pr_identify_cpu(ACPI_HANDLE handle, UINT32 level, void *context, void **status); -static int acpi_pr_probe(device_t dev); -static int acpi_pr_attach(device_t dev); - -static void acpi_pr_FindLapic(device_t dev, ACPI_HANDLE handle, PROCESSOR_APIC *lapic); -static ACPI_STATUS acpi_pr_CalculatePowerStates(struct acpi_pr_softc *sc); -static ACPI_STATUS acpi_pr_CalculatePerformanceStates(struct acpi_pr_softc *sc); -static ACPI_STATUS acpi_pr_CalculateThrottlingStates(struct acpi_pr_softc *sc); -static void acpi_pr_IdleHandler(void *arg, int count) __unused; -static ACPI_STATUS acpi_pr_PolicyInitialize(struct acpi_pr_softc *sc); - -static device_method_t acpi_pr_methods[] = { - /* Device interface */ - DEVMETHOD(device_identify, acpi_pr_identify), - DEVMETHOD(device_probe, acpi_pr_probe), - DEVMETHOD(device_attach, acpi_pr_attach), - - {0, 0} -}; - -static driver_t acpi_pr_driver = { - "acpi_pr", - acpi_pr_methods, - sizeof(struct acpi_pr_softc), -}; - -devclass_t acpi_pr_devclass; -DRIVER_MODULE(acpi_pr, acpi, acpi_pr_driver, acpi_pr_devclass, 0, 0); - -/* - * Scan the \_PR_ scope for processor objects, and attach them accordingly. - * - * XXX note that we should find the local APIC address and obtain a resource - * that we can hand to child devices for access to it... - */ -static void -acpi_pr_identify(driver_t *driver, device_t bus) -{ - ACPI_HANDLE handle; - - FUNCTION_TRACE(__func__); - - if (!acpi_disabled("processor") && - (AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_PR_", &handle) == AE_OK)) - AcpiWalkNamespace(ACPI_TYPE_PROCESSOR, handle, 2, acpi_pr_identify_cpu, bus, NULL); - - return_VOID; -} - -/* - * Create a child device for CPUs - */ -static ACPI_STATUS -acpi_pr_identify_cpu(ACPI_HANDLE handle, UINT32 level, void *context, void **status) -{ - device_t bus = (device_t)context; - device_t child; - PROCESSOR_APIC lapic; - - FUNCTION_TRACE(__func__); - - acpi_pr_FindLapic(bus, handle, &lapic); - - if (lapic.ProcessorEnabled) { - if ((child = BUS_ADD_CHILD(bus, 0, "acpi_pr", -1)) == NULL) { - device_printf(bus, "could not create CPU device\n"); - return_ACPI_STATUS(AE_OK); - } - acpi_set_handle(child, handle); - acpi_set_magic(child, PR_MAGIC); - device_set_desc(child, "processor device"); - } - - return_ACPI_STATUS(AE_OK); -} - -static int -acpi_pr_probe(device_t dev) -{ - if (acpi_get_magic(dev) == PR_MAGIC) - return(0); - return(ENXIO); -} - -static int -acpi_pr_attach(device_t dev) -{ - struct acpi_pr_softc *sc; - - FUNCTION_TRACE(__func__); - - sc = device_get_softc(dev); - sc->pr_dev = dev; - sc->pr_handle = acpi_get_handle(dev); - acpi_pr_FindLapic(dev, sc->pr_handle, &sc->pr_lapic); - - /* - * If the APIC information is valid, print it - */ - if (sc->pr_lapic.LocalApicId != (UINT8)0xff) - device_printf(dev, "local APIC ID %d\n", sc->pr_lapic.LocalApicId); - - /* - * Fetch operational parameters. - */ - if (acpi_pr_CalculatePowerStates(sc) == AE_OK) { - acpi_pr_PolicyInitialize(sc); - } - acpi_pr_CalculatePerformanceStates(sc); - acpi_pr_CalculateThrottlingStates(sc); - - /* XXX call MD cpu-identification here? */ - - return_VALUE(0); -} - -/* - * Find the Local Apic information for this CPU - */ -static void -acpi_pr_FindLapic(device_t dev, ACPI_HANDLE handle, PROCESSOR_APIC *lapic) -{ -#if 0 /* broken by new ACPICA code that doesn't support the APIC table */ - ACPI_BUFFER buf; - ACPI_STATUS status; - APIC_HEADER *hdr; - APIC_TABLE *tbl; - PROCESSOR_APIC *pap; - int len, cpuno; -#else - ACPI_STATUS status; - int cpuno; -#endif - - /* - * Assume that we're not going to suceed in finding/parsing the APIC table. - * In this case, CPU 0 is valid, and any other CPU is invalid. - */ - lapic->LocalApicId = 0xff; - lapic->ProcessorEnabled = 0; - if ((status = AcpiGetProcessorId(handle, &cpuno)) != AE_OK) { - device_printf(dev, "error fetching CPU device ID - %s\n", acpi_strerror(status)); - return; - } - lapic->ProcessorEnabled = (cpuno == 0); - -#if 0 /* broken by new ACPICA code that doesn't support the APIC table */ - /* - * Perform the tedious double-get to fetch the actual APIC table, and suck it in. - */ - buf.Length = 0; - buf.Pointer = NULL; - if ((status = AcpiGetTable(ACPI_TABLE_APIC, 1, &buf)) != AE_BUFFER_OVERFLOW) { - if (status != AE_NOT_EXIST) - device_printf(dev, "error sizing APIC table - %s\n", acpi_strerror(status)); - return; - } - if ((buf.Pointer = AcpiOsAllocate(buf.Length)) == NULL) - return; - if ((status = AcpiGetTable(ACPI_TABLE_APIC, 1, &buf)) != AE_OK) { - device_printf(dev, "error fetching APIC table - %s\n", acpi_strerror(status)); - return; - } - - /* - * Scan the tables looking for this CPU index. - */ - tbl = (APIC_TABLE *)buf.Pointer; - len = tbl->header.Length - sizeof(APIC_TABLE); - hdr = (APIC_HEADER *)((char *)buf.Pointer + sizeof(APIC_TABLE)); - while(len > 0) { - if (hdr->Length > len) { - device_printf(dev, "APIC header corrupt (claims %d bytes where only %d left in structure)\n", - hdr->Length, len); - break; - } - /* - * If we have found a processor APIC definition with - * matching CPU index, copy it out and return. - */ - if (hdr->Type == APIC_PROC) { - pap = (PROCESSOR_APIC *)hdr; - if (pap->ProcessorApicId == cpuno) { - bcopy(pap, lapic, sizeof(*pap)); - break; - } - } - len -= hdr->Length; - hdr = (APIC_HEADER *)((char *)hdr + hdr->Length); - } - AcpiOsFree(buf.Pointer); -#endif -} - -static ACPI_STATUS -acpi_pr_CalculatePowerStates(struct acpi_pr_softc *sc) -{ - ACPI_STATUS Status = AE_OK; - ACPI_BUFFER Buffer; - ACPI_CX_STATE *State = NULL; - u_int32_t StateCount = 0; - u_int32_t i = 0; - - FUNCTION_TRACE(__func__); - - /* - * Set Latency Defaults: - * --------------------- - * Default state latency to ACPI_UINT32_MAX -- meaning that this state - * should not be used by policy. This value is overriden by states - * that are present and have usable latencies (e.g. <= 1000us for C3). - */ - for (i = 0; i < PR_MAX_POWER_STATES; i++) - sc->pr_PowerStates.Info[i].Latency = ACPI_UINT32_MAX; - - /* - * Get Power State Latencies: - * -------------------------- - * - * XXX Note that ACPICA will never give us back C2 if it costs more than 100us, - * or C3 if it costs more than 1000us, so some of this code is redundant. - */ - Status = acpi_GetIntoBuffer(sc->pr_handle, AcpiGetProcessorCxInfo, &Buffer); - if (Status != AE_OK) { - device_printf(sc->pr_dev, "could not fetch ProcessorCxInfo - %s\n", acpi_strerror(Status)); - return_ACPI_STATUS(Status); - } - - State = (ACPI_CX_STATE*)(Buffer.Pointer); - if (State != NULL) { - device_printf(sc->pr_dev, "supported power states:"); - StateCount = Buffer.Length / sizeof(ACPI_CX_STATE); - for (i = 0; i < StateCount; i++) { - /* XXX C3 isn't supportable in MP configurations, how to best handle this? */ - if ((State[i].StateNumber < PR_MAX_POWER_STATES) && (State[i].Latency <= 1000)) { - printf(" C%d (%dus)", i, State[i].Latency); - sc->pr_PowerStates.Info[State[i].StateNumber].Latency = State[i].Latency; - } - } - printf("\n"); - } - sc->pr_PowerStates.Count = PR_MAX_POWER_STATES; - sc->pr_PowerStates.ActiveState = PR_POWER_STATE_C1; - - AcpiOsFree(Buffer.Pointer); - return_ACPI_STATUS(Status); -} - -static ACPI_STATUS -acpi_pr_CalculatePerformanceStates(struct acpi_pr_softc *sc) -{ - ACPI_STATUS Status = AE_OK; - - FUNCTION_TRACE(__func__); - - /* TODO... */ - - return_ACPI_STATUS(Status); -} - -static ACPI_STATUS -acpi_pr_CalculateThrottlingStates(struct acpi_pr_softc *sc) -{ - ACPI_STATUS Status = AE_OK; - ACPI_BUFFER Buffer; - ACPI_CPU_THROTTLING_STATE *State = NULL; - u_int32_t StateCount = 0; - u_int32_t i = 0; - - FUNCTION_TRACE(__func__); - - /* - * Get Throttling States: - * ---------------------- - */ - Status = acpi_GetIntoBuffer(sc->pr_handle, AcpiGetProcessorThrottlingInfo, &Buffer); - if (Status != AE_OK) { - device_printf(sc->pr_dev, "could not fetch ThrottlingInfo - %s\n", acpi_strerror(Status)); - return_ACPI_STATUS(Status); - } - - State = (ACPI_CPU_THROTTLING_STATE*)(Buffer.Pointer); - if (State != NULL) { - StateCount = Buffer.Length / sizeof(ACPI_CPU_THROTTLING_STATE); - device_printf(sc->pr_dev, "supported throttling states:"); - for (i = 0; i < StateCount; i++) { - if (State[i].StateNumber < PR_MAX_THROTTLING_STATES) { - /* TODO: Verify that state is *really* supported by this chipset/processor (e.g. errata). */ - sc->pr_ThrottlingStates.Percentage[State[i].StateNumber] = State[i].PercentOfClock; - sc->pr_ThrottlingStates.Count++; - printf(" %d%%", State[i].PercentOfClock); - } - } - printf("\n"); - } - - AcpiOsFree(Buffer.Pointer); - return_ACPI_STATUS(Status); -} - -static ACPI_STATUS -acpi_pr_PolicyInitialize(struct acpi_pr_softc *sc) -{ - ACPI_STATUS Status; - - FUNCTION_TRACE(__func__); - - if ((Status = AcpiSetProcessorSleepState(sc->pr_handle, sc->pr_PowerStates.ActiveState)) != AE_OK) { - device_printf(sc->pr_dev, "could not set Active sleep state - %s\n", acpi_strerror(Status)); - return_ACPI_STATUS(Status); - } - - /* XXX need to hook ourselves to be called when things go idle */ -/* sc->pr_idleevent = EVENTHANDLER_FAST_REGISTER(idle_event, acpi_pr_IdleHandler, sc, IDLE_PRI_FIRST); */ - return_ACPI_STATUS(AE_OK); -} - -static void -acpi_pr_IdleHandler(void *arg, int count) -{ - struct acpi_pr_softc *sc = (struct acpi_pr_softc *)arg; - ACPI_STATUS Status = AE_OK; - PR_CX_STATE_INFO *CxState = NULL; - PR_POWER_STATE ActiveState = PR_POWER_STATE_UNKNOWN; - PR_POWER_STATE NextState = PR_POWER_STATE_UNKNOWN; - u_int32_t PmTimerTicks = 0; - - ActiveState = NextState = sc->pr_PowerStates.ActiveState; - CxState = &(sc->pr_PowerStates.Info[ActiveState]); - CxState->Utilization++; - - /* - * Invoke Cx State: - * ---------------- - */ - if ((Status = AcpiProcessorSleep(sc->pr_handle, &PmTimerTicks)) != AE_OK) { - device_printf(sc->pr_dev, "AcpiProcessorSleep() failed - %s\n", acpi_strerror(Status)); - /* - * Something went wrong with the sleep attempt, so give up on trying to do this. - */ -/* EVENTHANDLER_FAST_DEREGISTER(idle_event, sc->pr_idleevent);*/ - device_printf(sc->pr_dev, "disabling CPU power saving\n"); - return; - } - - /* - * Check For State Promotion: - * -------------------------- - * Only need to check for promotion on C1 and C2, and then only - * when the state has a non-zero count threshold and target state. - */ - if (CxState->PromotionPolicy.CountThreshold && CxState->PromotionPolicy.TargetState && - ((ActiveState == PR_POWER_STATE_C1) || (ActiveState == PR_POWER_STATE_C2))) { - /* - * Check the amount of time we spent in the Cx state against our - * promotion policy. If successful (asleep longer than our threshold) - * increment our count and see if a promotion is in order. - */ - if (PmTimerTicks > (CxState->PromotionPolicy.TimeThreshold)) { - CxState->PromotionPolicy.Count++; - CxState->DemotionPolicy.Count = 0; - - if (CxState->PromotionPolicy.Count >= CxState->PromotionPolicy.CountThreshold) - NextState = CxState->PromotionPolicy.TargetState; - } - } - - /* - * Check For State Demotion: - * ------------------------- - * Only need to check for demotion on C2 and C3, and then only - * when the state has a non-zero count threshold and target state. - */ - if (CxState->DemotionPolicy.CountThreshold && CxState->DemotionPolicy.TargetState && - ((ActiveState == PR_POWER_STATE_C2) || (ActiveState == PR_POWER_STATE_C3))) { - /* - * Check the amount of time we spent in the Cx state against our - * demotion policy. If unsuccessful (asleep shorter than our threshold) - * increment our count and see if a demotion is in order. - */ - if (PmTimerTicks < (CxState->DemotionPolicy.TimeThreshold)) { - CxState->DemotionPolicy.Count++; - CxState->PromotionPolicy.Count = 0; - - if (CxState->DemotionPolicy.Count >= CxState->DemotionPolicy.CountThreshold) - NextState = CxState->DemotionPolicy.TargetState; - } - } - - /* - * New Cx State? - * ------------- - * If so, clean up from the previous Cx state (if necessary). - */ - if (NextState != sc->pr_PowerStates.ActiveState) { - if ((Status = AcpiSetProcessorSleepState(sc->pr_handle, NextState)) != AE_OK) { - device_printf(sc->pr_dev, "AcpiSetProcessorSleepState() returned error [0x%08X]\n", Status); - } else { - CxState->PromotionPolicy.Count = 0; - CxState->DemotionPolicy.Count = 0; - sc->pr_PowerStates.ActiveState = NextState; - } - } -} |