![Konrad Rzeszutek Wilk](/assets/img/avatar_default.png)
When booting the kernel under machines that do not have P-states we would end up with: ------------[ cut here ]------------ WARNING: at drivers/xen/xen-acpi-processor.c:504 xen_acpi_processor_init+0x286/0 x2e0() Hardware name: ProLiant BL460c G6 Modules linked in: Pid: 1, comm: swapper Not tainted 2.6.39-200.0.3.el5uek #1 Call Trace: [<ffffffff8191d056>] ? xen_acpi_processor_init+0x286/0x2e0 [<ffffffff81068300>] warn_slowpath_common+0x90/0xc0 [<ffffffff8191cdd0>] ? check_acpi_ids+0x1e0/0x1e0 [<ffffffff8106834a>] warn_slowpath_null+0x1a/0x20 [<ffffffff8191d056>] xen_acpi_processor_init+0x286/0x2e0 [<ffffffff8191cdd0>] ? check_acpi_ids+0x1e0/0x1e0 [<ffffffff81002168>] do_one_initcall+0xe8/0x130 .. snip.. Which is OK - the machines do not have P-states, so we fail to register to process the _PXX states. But there is no need to WARN the user of it. Oracle BZ# 13871288 Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
563 lines
16 KiB
C
563 lines
16 KiB
C
/*
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* Copyright 2012 by Oracle Inc
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* Author: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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*
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* This code borrows ideas from https://lkml.org/lkml/2011/11/30/249
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* so many thanks go to Kevin Tian <kevin.tian@intel.com>
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* and Yu Ke <ke.yu@intel.com>.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/cpumask.h>
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#include <linux/cpufreq.h>
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#include <linux/freezer.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/processor.h>
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#include <xen/interface/platform.h>
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#include <asm/xen/hypercall.h>
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#define DRV_NAME "xen-acpi-processor: "
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static int no_hypercall;
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MODULE_PARM_DESC(off, "Inhibit the hypercall.");
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module_param_named(off, no_hypercall, int, 0400);
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/*
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* Note: Do not convert the acpi_id* below to cpumask_var_t or use cpumask_bit
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* - as those shrink to nr_cpu_bits (which is dependent on possible_cpu), which
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* can be less than what we want to put in. Instead use the 'nr_acpi_bits'
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* which is dynamically computed based on the MADT or x2APIC table.
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*/
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static unsigned int nr_acpi_bits;
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/* Mutex to protect the acpi_ids_done - for CPU hotplug use. */
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static DEFINE_MUTEX(acpi_ids_mutex);
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/* Which ACPI ID we have processed from 'struct acpi_processor'. */
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static unsigned long *acpi_ids_done;
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/* Which ACPI ID exist in the SSDT/DSDT processor definitions. */
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static unsigned long __initdata *acpi_id_present;
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/* And if there is an _CST definition (or a PBLK) for the ACPI IDs */
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static unsigned long __initdata *acpi_id_cst_present;
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static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
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{
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struct xen_platform_op op = {
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.cmd = XENPF_set_processor_pminfo,
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.interface_version = XENPF_INTERFACE_VERSION,
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.u.set_pminfo.id = _pr->acpi_id,
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.u.set_pminfo.type = XEN_PM_CX,
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};
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struct xen_processor_cx *dst_cx, *dst_cx_states = NULL;
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struct acpi_processor_cx *cx;
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unsigned int i, ok;
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int ret = 0;
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dst_cx_states = kcalloc(_pr->power.count,
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sizeof(struct xen_processor_cx), GFP_KERNEL);
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if (!dst_cx_states)
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return -ENOMEM;
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for (ok = 0, i = 1; i <= _pr->power.count; i++) {
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cx = &_pr->power.states[i];
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if (!cx->valid)
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continue;
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dst_cx = &(dst_cx_states[ok++]);
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dst_cx->reg.space_id = ACPI_ADR_SPACE_SYSTEM_IO;
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if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
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dst_cx->reg.bit_width = 8;
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dst_cx->reg.bit_offset = 0;
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dst_cx->reg.access_size = 1;
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} else {
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dst_cx->reg.space_id = ACPI_ADR_SPACE_FIXED_HARDWARE;
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if (cx->entry_method == ACPI_CSTATE_FFH) {
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/* NATIVE_CSTATE_BEYOND_HALT */
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dst_cx->reg.bit_offset = 2;
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dst_cx->reg.bit_width = 1; /* VENDOR_INTEL */
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}
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dst_cx->reg.access_size = 0;
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}
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dst_cx->reg.address = cx->address;
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dst_cx->type = cx->type;
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dst_cx->latency = cx->latency;
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dst_cx->power = cx->power;
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dst_cx->dpcnt = 0;
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set_xen_guest_handle(dst_cx->dp, NULL);
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}
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if (!ok) {
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pr_debug(DRV_NAME "No _Cx for ACPI CPU %u\n", _pr->acpi_id);
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kfree(dst_cx_states);
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return -EINVAL;
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}
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op.u.set_pminfo.power.count = ok;
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op.u.set_pminfo.power.flags.bm_control = _pr->flags.bm_control;
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op.u.set_pminfo.power.flags.bm_check = _pr->flags.bm_check;
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op.u.set_pminfo.power.flags.has_cst = _pr->flags.has_cst;
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op.u.set_pminfo.power.flags.power_setup_done =
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_pr->flags.power_setup_done;
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set_xen_guest_handle(op.u.set_pminfo.power.states, dst_cx_states);
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if (!no_hypercall)
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ret = HYPERVISOR_dom0_op(&op);
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if (!ret) {
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pr_debug("ACPI CPU%u - C-states uploaded.\n", _pr->acpi_id);
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for (i = 1; i <= _pr->power.count; i++) {
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cx = &_pr->power.states[i];
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if (!cx->valid)
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continue;
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pr_debug(" C%d: %s %d uS\n",
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cx->type, cx->desc, (u32)cx->latency);
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}
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} else
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pr_err(DRV_NAME "(CX): Hypervisor error (%d) for ACPI CPU%u\n",
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ret, _pr->acpi_id);
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kfree(dst_cx_states);
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return ret;
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}
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static struct xen_processor_px *
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xen_copy_pss_data(struct acpi_processor *_pr,
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struct xen_processor_performance *dst_perf)
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{
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struct xen_processor_px *dst_states = NULL;
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unsigned int i;
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BUILD_BUG_ON(sizeof(struct xen_processor_px) !=
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sizeof(struct acpi_processor_px));
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dst_states = kcalloc(_pr->performance->state_count,
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sizeof(struct xen_processor_px), GFP_KERNEL);
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if (!dst_states)
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return ERR_PTR(-ENOMEM);
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dst_perf->state_count = _pr->performance->state_count;
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for (i = 0; i < _pr->performance->state_count; i++) {
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/* Fortunatly for us, they are both the same size */
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memcpy(&(dst_states[i]), &(_pr->performance->states[i]),
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sizeof(struct acpi_processor_px));
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}
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return dst_states;
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}
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static int xen_copy_psd_data(struct acpi_processor *_pr,
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struct xen_processor_performance *dst)
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{
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struct acpi_psd_package *pdomain;
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BUILD_BUG_ON(sizeof(struct xen_psd_package) !=
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sizeof(struct acpi_psd_package));
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/* This information is enumerated only if acpi_processor_preregister_performance
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* has been called.
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*/
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dst->shared_type = _pr->performance->shared_type;
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pdomain = &(_pr->performance->domain_info);
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/* 'acpi_processor_preregister_performance' does not parse if the
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* num_processors <= 1, but Xen still requires it. Do it manually here.
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*/
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if (pdomain->num_processors <= 1) {
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if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
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dst->shared_type = CPUFREQ_SHARED_TYPE_ALL;
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else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
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dst->shared_type = CPUFREQ_SHARED_TYPE_HW;
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else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
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dst->shared_type = CPUFREQ_SHARED_TYPE_ANY;
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}
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memcpy(&(dst->domain_info), pdomain, sizeof(struct acpi_psd_package));
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return 0;
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}
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static int xen_copy_pct_data(struct acpi_pct_register *pct,
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struct xen_pct_register *dst_pct)
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{
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/* It would be nice if you could just do 'memcpy(pct, dst_pct') but
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* sadly the Xen structure did not have the proper padding so the
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* descriptor field takes two (dst_pct) bytes instead of one (pct).
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*/
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dst_pct->descriptor = pct->descriptor;
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dst_pct->length = pct->length;
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dst_pct->space_id = pct->space_id;
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dst_pct->bit_width = pct->bit_width;
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dst_pct->bit_offset = pct->bit_offset;
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dst_pct->reserved = pct->reserved;
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dst_pct->address = pct->address;
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return 0;
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}
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static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
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{
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int ret = 0;
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struct xen_platform_op op = {
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.cmd = XENPF_set_processor_pminfo,
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.interface_version = XENPF_INTERFACE_VERSION,
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.u.set_pminfo.id = _pr->acpi_id,
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.u.set_pminfo.type = XEN_PM_PX,
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};
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struct xen_processor_performance *dst_perf;
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struct xen_processor_px *dst_states = NULL;
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dst_perf = &op.u.set_pminfo.perf;
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dst_perf->platform_limit = _pr->performance_platform_limit;
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dst_perf->flags |= XEN_PX_PPC;
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xen_copy_pct_data(&(_pr->performance->control_register),
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&dst_perf->control_register);
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xen_copy_pct_data(&(_pr->performance->status_register),
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&dst_perf->status_register);
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dst_perf->flags |= XEN_PX_PCT;
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dst_states = xen_copy_pss_data(_pr, dst_perf);
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if (!IS_ERR_OR_NULL(dst_states)) {
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set_xen_guest_handle(dst_perf->states, dst_states);
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dst_perf->flags |= XEN_PX_PSS;
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}
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if (!xen_copy_psd_data(_pr, dst_perf))
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dst_perf->flags |= XEN_PX_PSD;
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if (dst_perf->flags != (XEN_PX_PSD | XEN_PX_PSS | XEN_PX_PCT | XEN_PX_PPC)) {
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pr_warn(DRV_NAME "ACPI CPU%u missing some P-state data (%x), skipping.\n",
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_pr->acpi_id, dst_perf->flags);
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ret = -ENODEV;
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goto err_free;
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}
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if (!no_hypercall)
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ret = HYPERVISOR_dom0_op(&op);
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if (!ret) {
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struct acpi_processor_performance *perf;
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unsigned int i;
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perf = _pr->performance;
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pr_debug("ACPI CPU%u - P-states uploaded.\n", _pr->acpi_id);
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for (i = 0; i < perf->state_count; i++) {
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pr_debug(" %cP%d: %d MHz, %d mW, %d uS\n",
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(i == perf->state ? '*' : ' '), i,
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(u32) perf->states[i].core_frequency,
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(u32) perf->states[i].power,
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(u32) perf->states[i].transition_latency);
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}
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} else if (ret != -EINVAL)
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/* EINVAL means the ACPI ID is incorrect - meaning the ACPI
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* table is referencing a non-existing CPU - which can happen
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* with broken ACPI tables. */
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pr_warn(DRV_NAME "(_PXX): Hypervisor error (%d) for ACPI CPU%u\n",
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ret, _pr->acpi_id);
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err_free:
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if (!IS_ERR_OR_NULL(dst_states))
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kfree(dst_states);
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return ret;
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}
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static int upload_pm_data(struct acpi_processor *_pr)
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{
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int err = 0;
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mutex_lock(&acpi_ids_mutex);
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if (__test_and_set_bit(_pr->acpi_id, acpi_ids_done)) {
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mutex_unlock(&acpi_ids_mutex);
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return -EBUSY;
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}
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if (_pr->flags.power)
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err = push_cxx_to_hypervisor(_pr);
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if (_pr->performance && _pr->performance->states)
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err |= push_pxx_to_hypervisor(_pr);
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mutex_unlock(&acpi_ids_mutex);
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return err;
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}
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static unsigned int __init get_max_acpi_id(void)
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{
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struct xenpf_pcpuinfo *info;
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struct xen_platform_op op = {
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.cmd = XENPF_get_cpuinfo,
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.interface_version = XENPF_INTERFACE_VERSION,
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};
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int ret = 0;
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unsigned int i, last_cpu, max_acpi_id = 0;
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info = &op.u.pcpu_info;
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info->xen_cpuid = 0;
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ret = HYPERVISOR_dom0_op(&op);
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if (ret)
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return NR_CPUS;
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/* The max_present is the same irregardless of the xen_cpuid */
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last_cpu = op.u.pcpu_info.max_present;
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for (i = 0; i <= last_cpu; i++) {
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info->xen_cpuid = i;
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ret = HYPERVISOR_dom0_op(&op);
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if (ret)
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continue;
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max_acpi_id = max(info->acpi_id, max_acpi_id);
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}
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max_acpi_id *= 2; /* Slack for CPU hotplug support. */
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pr_debug(DRV_NAME "Max ACPI ID: %u\n", max_acpi_id);
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return max_acpi_id;
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}
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/*
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* The read_acpi_id and check_acpi_ids are there to support the Xen
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* oddity of virtual CPUs != physical CPUs in the initial domain.
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* The user can supply 'xen_max_vcpus=X' on the Xen hypervisor line
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* which will band the amount of CPUs the initial domain can see.
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* In general that is OK, except it plays havoc with any of the
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* for_each_[present|online]_cpu macros which are banded to the virtual
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* CPU amount.
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*/
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static acpi_status __init
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read_acpi_id(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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u32 acpi_id;
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acpi_status status;
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acpi_object_type acpi_type;
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unsigned long long tmp;
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union acpi_object object = { 0 };
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struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
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acpi_io_address pblk = 0;
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status = acpi_get_type(handle, &acpi_type);
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if (ACPI_FAILURE(status))
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return AE_OK;
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switch (acpi_type) {
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case ACPI_TYPE_PROCESSOR:
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status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
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if (ACPI_FAILURE(status))
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return AE_OK;
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acpi_id = object.processor.proc_id;
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pblk = object.processor.pblk_address;
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break;
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case ACPI_TYPE_DEVICE:
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status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
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if (ACPI_FAILURE(status))
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return AE_OK;
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acpi_id = tmp;
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break;
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default:
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return AE_OK;
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}
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/* There are more ACPI Processor objects than in x2APIC or MADT.
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* This can happen with incorrect ACPI SSDT declerations. */
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if (acpi_id > nr_acpi_bits) {
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pr_debug(DRV_NAME "We only have %u, trying to set %u\n",
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nr_acpi_bits, acpi_id);
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return AE_OK;
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}
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/* OK, There is a ACPI Processor object */
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__set_bit(acpi_id, acpi_id_present);
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pr_debug(DRV_NAME "ACPI CPU%u w/ PBLK:0x%lx\n", acpi_id,
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(unsigned long)pblk);
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status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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if (!pblk)
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return AE_OK;
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}
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/* .. and it has a C-state */
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__set_bit(acpi_id, acpi_id_cst_present);
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return AE_OK;
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}
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static int __init check_acpi_ids(struct acpi_processor *pr_backup)
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{
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if (!pr_backup)
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return -ENODEV;
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/* All online CPUs have been processed at this stage. Now verify
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* whether in fact "online CPUs" == physical CPUs.
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*/
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acpi_id_present = kcalloc(BITS_TO_LONGS(nr_acpi_bits), sizeof(unsigned long), GFP_KERNEL);
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if (!acpi_id_present)
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return -ENOMEM;
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acpi_id_cst_present = kcalloc(BITS_TO_LONGS(nr_acpi_bits), sizeof(unsigned long), GFP_KERNEL);
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if (!acpi_id_cst_present) {
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kfree(acpi_id_present);
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return -ENOMEM;
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}
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acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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read_acpi_id, NULL, NULL, NULL);
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acpi_get_devices("ACPI0007", read_acpi_id, NULL, NULL);
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if (!bitmap_equal(acpi_id_present, acpi_ids_done, nr_acpi_bits)) {
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unsigned int i;
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for_each_set_bit(i, acpi_id_present, nr_acpi_bits) {
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pr_backup->acpi_id = i;
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/* Mask out C-states if there are no _CST or PBLK */
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pr_backup->flags.power = test_bit(i, acpi_id_cst_present);
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(void)upload_pm_data(pr_backup);
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}
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}
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kfree(acpi_id_present);
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acpi_id_present = NULL;
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kfree(acpi_id_cst_present);
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acpi_id_cst_present = NULL;
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return 0;
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}
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static int __init check_prereq(void)
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{
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struct cpuinfo_x86 *c = &cpu_data(0);
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if (!xen_initial_domain())
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return -ENODEV;
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if (!acpi_gbl_FADT.smi_command)
|
|
return -ENODEV;
|
|
|
|
if (c->x86_vendor == X86_VENDOR_INTEL) {
|
|
if (!cpu_has(c, X86_FEATURE_EST))
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
if (c->x86_vendor == X86_VENDOR_AMD) {
|
|
/* Copied from powernow-k8.h, can't include ../cpufreq/powernow
|
|
* as we get compile warnings for the static functions.
|
|
*/
|
|
#define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007
|
|
#define USE_HW_PSTATE 0x00000080
|
|
u32 eax, ebx, ecx, edx;
|
|
cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
|
|
if ((edx & USE_HW_PSTATE) != USE_HW_PSTATE)
|
|
return -ENODEV;
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
/* acpi_perf_data is a pointer to percpu data. */
|
|
static struct acpi_processor_performance __percpu *acpi_perf_data;
|
|
|
|
static void free_acpi_perf_data(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
/* Freeing a NULL pointer is OK, and alloc_percpu zeroes. */
|
|
for_each_possible_cpu(i)
|
|
free_cpumask_var(per_cpu_ptr(acpi_perf_data, i)
|
|
->shared_cpu_map);
|
|
free_percpu(acpi_perf_data);
|
|
}
|
|
|
|
static int __init xen_acpi_processor_init(void)
|
|
{
|
|
struct acpi_processor *pr_backup = NULL;
|
|
unsigned int i;
|
|
int rc = check_prereq();
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
nr_acpi_bits = get_max_acpi_id() + 1;
|
|
acpi_ids_done = kcalloc(BITS_TO_LONGS(nr_acpi_bits), sizeof(unsigned long), GFP_KERNEL);
|
|
if (!acpi_ids_done)
|
|
return -ENOMEM;
|
|
|
|
acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
|
|
if (!acpi_perf_data) {
|
|
pr_debug(DRV_NAME "Memory allocation error for acpi_perf_data.\n");
|
|
kfree(acpi_ids_done);
|
|
return -ENOMEM;
|
|
}
|
|
for_each_possible_cpu(i) {
|
|
if (!zalloc_cpumask_var_node(
|
|
&per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
|
|
GFP_KERNEL, cpu_to_node(i))) {
|
|
rc = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
}
|
|
|
|
/* Do initialization in ACPI core. It is OK to fail here. */
|
|
(void)acpi_processor_preregister_performance(acpi_perf_data);
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct acpi_processor_performance *perf;
|
|
|
|
perf = per_cpu_ptr(acpi_perf_data, i);
|
|
rc = acpi_processor_register_performance(perf, i);
|
|
if (rc)
|
|
goto err_out;
|
|
}
|
|
rc = acpi_processor_notify_smm(THIS_MODULE);
|
|
if (rc)
|
|
goto err_unregister;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct acpi_processor *_pr;
|
|
_pr = per_cpu(processors, i /* APIC ID */);
|
|
if (!_pr)
|
|
continue;
|
|
|
|
if (!pr_backup) {
|
|
pr_backup = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
|
|
memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
|
|
}
|
|
(void)upload_pm_data(_pr);
|
|
}
|
|
rc = check_acpi_ids(pr_backup);
|
|
if (rc)
|
|
goto err_unregister;
|
|
|
|
kfree(pr_backup);
|
|
|
|
return 0;
|
|
err_unregister:
|
|
for_each_possible_cpu(i) {
|
|
struct acpi_processor_performance *perf;
|
|
perf = per_cpu_ptr(acpi_perf_data, i);
|
|
acpi_processor_unregister_performance(perf, i);
|
|
}
|
|
err_out:
|
|
/* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
|
|
free_acpi_perf_data();
|
|
kfree(acpi_ids_done);
|
|
return rc;
|
|
}
|
|
static void __exit xen_acpi_processor_exit(void)
|
|
{
|
|
int i;
|
|
|
|
kfree(acpi_ids_done);
|
|
for_each_possible_cpu(i) {
|
|
struct acpi_processor_performance *perf;
|
|
perf = per_cpu_ptr(acpi_perf_data, i);
|
|
acpi_processor_unregister_performance(perf, i);
|
|
}
|
|
free_acpi_perf_data();
|
|
}
|
|
|
|
MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>");
|
|
MODULE_DESCRIPTION("Xen ACPI Processor P-states (and Cx) driver which uploads PM data to Xen hypervisor");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* We want to be loaded before the CPU freq scaling drivers are loaded.
|
|
* They are loaded in late_initcall. */
|
|
device_initcall(xen_acpi_processor_init);
|
|
module_exit(xen_acpi_processor_exit);
|