da378661c0
The D_NEEDMINOR flag was introduced for drivers that do not actually depend on storing a device unit/minor number, but require the ability to address the cdevs by this number, which is used by clone_create(). The cpuctl(4) driver sets D_NEEDMINOR, even though it doesn't use the clone_create() API. Remove the flag, because maybe we want to get rid of it somewhere in the far future.
446 lines
11 KiB
C
446 lines
11 KiB
C
/*-
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* Copyright (c) 2006-2008 Stanislav Sedov <stas@FreeBSD.org>
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* All rights reserved.
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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*/
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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/conf.h>
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#include <sys/fcntl.h>
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#include <sys/ioccom.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sched.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/uio.h>
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#include <sys/pcpu.h>
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#include <sys/smp.h>
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#include <sys/pmckern.h>
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#include <sys/cpuctl.h>
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#include <machine/cpufunc.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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static d_open_t cpuctl_open;
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static d_ioctl_t cpuctl_ioctl;
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#define CPUCTL_VERSION 1
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#ifdef DEBUG
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# define DPRINTF(format,...) printf(format, __VA_ARGS__);
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#else
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# define DPRINTF(...)
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#endif
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#define UCODE_SIZE_MAX (10 * 1024)
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static int cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd,
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struct thread *td);
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static int cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data,
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struct thread *td);
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static int cpuctl_do_update(int cpu, cpuctl_update_args_t *data,
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struct thread *td);
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static int update_intel(int cpu, cpuctl_update_args_t *args,
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struct thread *td);
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static int update_amd(int cpu, cpuctl_update_args_t *args, struct thread *td);
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static struct cdev **cpuctl_devs;
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static MALLOC_DEFINE(M_CPUCTL, "cpuctl", "CPUCTL buffer");
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static struct cdevsw cpuctl_cdevsw = {
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.d_version = D_VERSION,
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.d_open = cpuctl_open,
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.d_ioctl = cpuctl_ioctl,
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.d_name = "cpuctl",
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};
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/*
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* This function checks if specified cpu enabled or not.
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*/
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static int
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cpu_enabled(int cpu)
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{
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return (pmc_cpu_is_disabled(cpu) == 0);
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}
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/*
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* Check if the current thread is bound to a specific cpu.
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*/
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static int
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cpu_sched_is_bound(struct thread *td)
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{
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int ret;
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thread_lock(td);
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ret = sched_is_bound(td);
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thread_unlock(td);
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return (ret);
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}
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/*
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* Switch to target cpu to run.
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*/
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static void
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set_cpu(int cpu, struct thread *td)
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{
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KASSERT(cpu >= 0 && cpu < mp_ncpus && cpu_enabled(cpu),
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("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
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thread_lock(td);
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sched_bind(td, cpu);
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thread_unlock(td);
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KASSERT(td->td_oncpu == cpu,
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("[cpuctl,%d]: cannot bind to target cpu %d", __LINE__, cpu));
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}
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static void
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restore_cpu(int oldcpu, int is_bound, struct thread *td)
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{
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KASSERT(oldcpu >= 0 && oldcpu < mp_ncpus && cpu_enabled(oldcpu),
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("[cpuctl,%d]: bad cpu number %d", __LINE__, oldcpu));
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thread_lock(td);
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if (is_bound == 0)
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sched_unbind(td);
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else
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sched_bind(td, oldcpu);
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thread_unlock(td);
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}
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int
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cpuctl_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
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int flags, struct thread *td)
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{
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int ret;
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int cpu = minor(dev);
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if (cpu >= mp_ncpus || !cpu_enabled(cpu)) {
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DPRINTF("[cpuctl,%d]: bad cpu number %d\n", __LINE__, cpu);
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return (ENXIO);
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}
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/* Require write flag for "write" requests. */
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if ((cmd == CPUCTL_WRMSR || cmd == CPUCTL_UPDATE) &&
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((flags & FWRITE) == 0))
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return (EPERM);
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switch (cmd) {
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case CPUCTL_RDMSR:
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ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd, td);
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break;
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case CPUCTL_WRMSR:
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ret = priv_check(td, PRIV_CPUCTL_WRMSR);
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if (ret != 0)
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goto fail;
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ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd, td);
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break;
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case CPUCTL_CPUID:
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ret = cpuctl_do_cpuid(cpu, (cpuctl_cpuid_args_t *)data, td);
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break;
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case CPUCTL_UPDATE:
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ret = priv_check(td, PRIV_CPUCTL_UPDATE);
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if (ret != 0)
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goto fail;
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ret = cpuctl_do_update(cpu, (cpuctl_update_args_t *)data, td);
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break;
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default:
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ret = EINVAL;
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break;
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}
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fail:
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return (ret);
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}
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/*
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* Actually perform cpuid operation.
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*/
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static int
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cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data, struct thread *td)
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{
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int is_bound = 0;
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int oldcpu;
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KASSERT(cpu >= 0 && cpu < mp_ncpus,
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("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
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/* Explicitly clear cpuid data to avoid returning stale info. */
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bzero(data->data, sizeof(data->data));
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DPRINTF("[cpuctl,%d]: retriving cpuid level %#0x for %d cpu\n",
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__LINE__, data->level, cpu);
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oldcpu = td->td_oncpu;
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is_bound = cpu_sched_is_bound(td);
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set_cpu(cpu, td);
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do_cpuid(data->level, data->data);
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restore_cpu(oldcpu, is_bound, td);
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return (0);
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}
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/*
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* Actually perform MSR operations.
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*/
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static int
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cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd, struct thread *td)
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{
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int is_bound = 0;
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int oldcpu;
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int ret;
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KASSERT(cpu >= 0 && cpu < mp_ncpus,
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("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
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/*
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* Explicitly clear cpuid data to avoid returning stale
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* info
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*/
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data->data = 0;
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DPRINTF("[cpuctl,%d]: operating on MSR %#0x for %d cpu\n", __LINE__,
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data->msr, cpu);
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oldcpu = td->td_oncpu;
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is_bound = cpu_sched_is_bound(td);
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set_cpu(cpu, td);
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ret = cmd == CPUCTL_RDMSR ? rdmsr_safe(data->msr, &data->data) :
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wrmsr_safe(data->msr, data->data);
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restore_cpu(oldcpu, is_bound, td);
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return (ret);
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}
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/*
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* Actually perform microcode update.
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*/
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static int
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cpuctl_do_update(int cpu, cpuctl_update_args_t *data, struct thread *td)
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{
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cpuctl_cpuid_args_t args = {
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.level = 0,
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};
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char vendor[13];
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int ret;
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KASSERT(cpu >= 0 && cpu < mp_ncpus,
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("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
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DPRINTF("[cpuctl,%d]: XXX %d", __LINE__, cpu);
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ret = cpuctl_do_cpuid(cpu, &args, td);
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if (ret != 0) {
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DPRINTF("[cpuctl,%d]: cannot retrive cpuid info for cpu %d",
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__LINE__, cpu);
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return (ENXIO);
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}
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((uint32_t *)vendor)[0] = args.data[1];
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((uint32_t *)vendor)[1] = args.data[3];
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((uint32_t *)vendor)[2] = args.data[2];
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vendor[12] = '\0';
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if (strncmp(vendor, INTEL_VENDOR_ID, sizeof(INTEL_VENDOR_ID)) == 0)
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ret = update_intel(cpu, data, td);
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else if(strncmp(vendor, INTEL_VENDOR_ID, sizeof(AMD_VENDOR_ID)) == 0)
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ret = update_amd(cpu, data, td);
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else
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ret = ENXIO;
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return (ret);
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}
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static int
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update_intel(int cpu, cpuctl_update_args_t *args, struct thread *td)
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{
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void *ptr = NULL;
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uint64_t rev0, rev1;
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uint32_t tmp[4];
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int is_bound = 0;
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int oldcpu;
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int ret;
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if (args->size == 0 || args->data == NULL) {
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DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
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return (EINVAL);
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}
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if (args->size > UCODE_SIZE_MAX) {
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DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
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return (EINVAL);
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}
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/*
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* 16 byte alignment required.
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*/
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ptr = malloc(args->size + 16, M_CPUCTL, M_WAITOK);
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ptr = (void *)(16 + ((intptr_t)ptr & ~0xf));
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if (copyin(args->data, ptr, args->size) != 0) {
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DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
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__LINE__, args->data, ptr, args->size);
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ret = EFAULT;
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goto fail;
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}
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oldcpu = td->td_oncpu;
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is_bound = cpu_sched_is_bound(td);
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set_cpu(cpu, td);
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critical_enter();
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rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current micorcode revision. */
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/*
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* Perform update.
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*/
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wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
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wrmsr_safe(MSR_BIOS_SIGN, 0);
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/*
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* Serialize instruction flow.
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*/
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do_cpuid(0, tmp);
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critical_exit();
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rdmsr_safe(MSR_BIOS_SIGN, &rev1); /* Get new micorcode revision. */
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restore_cpu(oldcpu, is_bound, td);
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if (rev1 > rev0)
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ret = 0;
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else
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ret = EEXIST;
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fail:
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if (ptr != NULL)
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contigfree(ptr, args->size, M_CPUCTL);
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return (ret);
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}
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static int
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update_amd(int cpu, cpuctl_update_args_t *args, struct thread *td)
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{
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void *ptr = NULL;
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uint32_t tmp[4];
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int is_bound = 0;
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int oldcpu;
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int ret;
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if (args->size == 0 || args->data == NULL) {
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DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
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return (EINVAL);
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}
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if (args->size > UCODE_SIZE_MAX) {
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DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
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return (EINVAL);
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}
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/*
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* XXX Might not require contignous address space - needs check
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*/
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ptr = contigmalloc(args->size, M_CPUCTL, 0, 0, 0xffffffff, 16, 0);
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if (ptr == NULL) {
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DPRINTF("[cpuctl,%d]: cannot allocate %zd bytes of memory",
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__LINE__, args->size);
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return (ENOMEM);
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}
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if (copyin(args->data, ptr, args->size) != 0) {
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DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
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__LINE__, args->data, ptr, args->size);
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ret = EFAULT;
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goto fail;
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}
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oldcpu = td->td_oncpu;
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is_bound = cpu_sched_is_bound(td);
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set_cpu(cpu, td);
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critical_enter();
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/*
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* Perform update.
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*/
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wrmsr_safe(MSR_K8_UCODE_UPDATE, (uintptr_t)args->data);
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/*
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* Serialize instruction flow.
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*/
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do_cpuid(0, tmp);
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critical_exit();
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restore_cpu(oldcpu, is_bound, td);
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ret = 0;
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fail:
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if (ptr != NULL)
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contigfree(ptr, args->size, M_CPUCTL);
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return (ret);
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}
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int
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cpuctl_open(struct cdev *dev, int flags, int fmt __unused, struct thread *td)
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{
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int ret = 0;
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int cpu;
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cpu = minor(dev);
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if (cpu >= mp_ncpus || !cpu_enabled(cpu)) {
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DPRINTF("[cpuctl,%d]: incorrect cpu number %d\n", __LINE__,
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cpu);
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return (ENXIO);
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}
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if (flags & FWRITE)
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ret = securelevel_gt(td->td_ucred, 0);
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return (ret);
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}
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static int
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cpuctl_modevent(module_t mod __unused, int type, void *data __unused)
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{
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int cpu;
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switch(type) {
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case MOD_LOAD:
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if ((cpu_feature & CPUID_MSR) == 0) {
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if (bootverbose)
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printf("cpuctl: not available.\n");
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return (ENODEV);
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}
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if (bootverbose)
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printf("cpuctl: access to MSR registers/cpuid info.\n");
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cpuctl_devs = (struct cdev **)malloc(sizeof(void *) * mp_ncpus,
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M_CPUCTL, M_WAITOK | M_ZERO);
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if (cpuctl_devs == NULL) {
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DPRINTF("[cpuctl,%d]: cannot allocate memory\n",
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__LINE__);
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return (ENOMEM);
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}
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for (cpu = 0; cpu < mp_ncpus; cpu++)
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if (cpu_enabled(cpu))
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cpuctl_devs[cpu] = make_dev(&cpuctl_cdevsw, cpu,
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UID_ROOT, GID_KMEM, 0640, "cpuctl%d", cpu);
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break;
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case MOD_UNLOAD:
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for (cpu = 0; cpu < mp_ncpus; cpu++) {
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if (cpuctl_devs[cpu] != NULL)
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destroy_dev(cpuctl_devs[cpu]);
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}
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free(cpuctl_devs, M_CPUCTL);
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break;
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case MOD_SHUTDOWN:
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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DEV_MODULE(cpuctl, cpuctl_modevent, NULL);
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MODULE_VERSION(cpuctl, CPUCTL_VERSION);
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