2 * Copyright (c) 2006-2008 Stanislav Sedov <stas@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
34 #include <sys/fcntl.h>
35 #include <sys/ioccom.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
41 #include <sys/queue.h>
42 #include <sys/sched.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
48 #include <sys/pmckern.h>
49 #include <sys/cpuctl.h>
51 #include <machine/cpufunc.h>
52 #include <machine/md_var.h>
53 #include <machine/specialreg.h>
55 static d_open_t cpuctl_open;
56 static d_ioctl_t cpuctl_ioctl;
58 #define CPUCTL_VERSION 1
61 # define DPRINTF(format,...) printf(format, __VA_ARGS__);
66 #define UCODE_SIZE_MAX (10 * 1024)
68 static int cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd,
70 static int cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data,
72 static int cpuctl_do_update(int cpu, cpuctl_update_args_t *data,
74 static int update_intel(int cpu, cpuctl_update_args_t *args,
76 static int update_amd(int cpu, cpuctl_update_args_t *args, struct thread *td);
78 static struct cdev **cpuctl_devs;
79 static MALLOC_DEFINE(M_CPUCTL, "cpuctl", "CPUCTL buffer");
81 static struct cdevsw cpuctl_cdevsw = {
82 .d_version = D_VERSION,
84 .d_open = cpuctl_open,
85 .d_ioctl = cpuctl_ioctl,
90 * This function checks if specified cpu enabled or not.
96 return (pmc_cpu_is_disabled(cpu) == 0);
100 * Check if the current thread is bound to a specific cpu.
103 cpu_sched_is_bound(struct thread *td)
108 ret = sched_is_bound(td);
114 * Switch to target cpu to run.
117 set_cpu(int cpu, struct thread *td)
120 KASSERT(cpu >= 0 && cpu < mp_ncpus && cpu_enabled(cpu),
121 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
125 KASSERT(td->td_oncpu == cpu,
126 ("[cpuctl,%d]: cannot bind to target cpu %d", __LINE__, cpu));
130 restore_cpu(int oldcpu, int is_bound, struct thread *td)
133 KASSERT(oldcpu >= 0 && oldcpu < mp_ncpus && cpu_enabled(oldcpu),
134 ("[cpuctl,%d]: bad cpu number %d", __LINE__, oldcpu));
139 sched_bind(td, oldcpu);
144 cpuctl_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
145 int flags, struct thread *td)
148 int cpu = minor(dev);
150 if (cpu >= mp_ncpus || !cpu_enabled(cpu)) {
151 DPRINTF("[cpuctl,%d]: bad cpu number %d\n", __LINE__, cpu);
154 /* Require write flag for "write" requests. */
155 if ((cmd == CPUCTL_WRMSR || cmd == CPUCTL_UPDATE) &&
156 ((flags & FWRITE) == 0))
160 ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd, td);
163 ret = priv_check(td, PRIV_CPUCTL_WRMSR);
166 ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd, td);
169 ret = cpuctl_do_cpuid(cpu, (cpuctl_cpuid_args_t *)data, td);
172 ret = priv_check(td, PRIV_CPUCTL_UPDATE);
175 ret = cpuctl_do_update(cpu, (cpuctl_update_args_t *)data, td);
186 * Actually perform cpuid operation.
189 cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data, struct thread *td)
194 KASSERT(cpu >= 0 && cpu < mp_ncpus,
195 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
197 /* Explicitly clear cpuid data to avoid returning stale info. */
198 bzero(data->data, sizeof(data->data));
199 DPRINTF("[cpuctl,%d]: retriving cpuid level %#0x for %d cpu\n",
200 __LINE__, data->level, cpu);
201 oldcpu = td->td_oncpu;
202 is_bound = cpu_sched_is_bound(td);
204 do_cpuid(data->level, data->data);
205 restore_cpu(oldcpu, is_bound, td);
210 * Actually perform MSR operations.
213 cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd, struct thread *td)
219 KASSERT(cpu >= 0 && cpu < mp_ncpus,
220 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
223 * Explicitly clear cpuid data to avoid returning stale
227 DPRINTF("[cpuctl,%d]: operating on MSR %#0x for %d cpu\n", __LINE__,
229 oldcpu = td->td_oncpu;
230 is_bound = cpu_sched_is_bound(td);
232 ret = cmd == CPUCTL_RDMSR ? rdmsr_safe(data->msr, &data->data) :
233 wrmsr_safe(data->msr, data->data);
234 restore_cpu(oldcpu, is_bound, td);
239 * Actually perform microcode update.
242 cpuctl_do_update(int cpu, cpuctl_update_args_t *data, struct thread *td)
244 cpuctl_cpuid_args_t args = {
250 KASSERT(cpu >= 0 && cpu < mp_ncpus,
251 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
252 DPRINTF("[cpuctl,%d]: XXX %d", __LINE__, cpu);
254 ret = cpuctl_do_cpuid(cpu, &args, td);
256 DPRINTF("[cpuctl,%d]: cannot retrive cpuid info for cpu %d",
260 ((uint32_t *)vendor)[0] = args.data[1];
261 ((uint32_t *)vendor)[1] = args.data[3];
262 ((uint32_t *)vendor)[2] = args.data[2];
264 if (strncmp(vendor, INTEL_VENDOR_ID, sizeof(INTEL_VENDOR_ID)) == 0)
265 ret = update_intel(cpu, data, td);
266 else if(strncmp(vendor, INTEL_VENDOR_ID, sizeof(AMD_VENDOR_ID)) == 0)
267 ret = update_amd(cpu, data, td);
274 update_intel(int cpu, cpuctl_update_args_t *args, struct thread *td)
283 if (args->size == 0 || args->data == NULL) {
284 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
287 if (args->size > UCODE_SIZE_MAX) {
288 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
293 * 16 byte alignment required.
295 ptr = malloc(args->size + 16, M_CPUCTL, M_WAITOK);
296 ptr = (void *)(16 + ((intptr_t)ptr & ~0xf));
297 if (copyin(args->data, ptr, args->size) != 0) {
298 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
299 __LINE__, args->data, ptr, args->size);
303 oldcpu = td->td_oncpu;
304 is_bound = cpu_sched_is_bound(td);
307 rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current micorcode revision. */
312 wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
313 wrmsr_safe(MSR_BIOS_SIGN, 0);
316 * Serialize instruction flow.
320 rdmsr_safe(MSR_BIOS_SIGN, &rev1); /* Get new micorcode revision. */
321 restore_cpu(oldcpu, is_bound, td);
328 contigfree(ptr, args->size, M_CPUCTL);
333 update_amd(int cpu, cpuctl_update_args_t *args, struct thread *td)
341 if (args->size == 0 || args->data == NULL) {
342 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
345 if (args->size > UCODE_SIZE_MAX) {
346 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
350 * XXX Might not require contignous address space - needs check
352 ptr = contigmalloc(args->size, M_CPUCTL, 0, 0, 0xffffffff, 16, 0);
354 DPRINTF("[cpuctl,%d]: cannot allocate %zd bytes of memory",
355 __LINE__, args->size);
358 if (copyin(args->data, ptr, args->size) != 0) {
359 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
360 __LINE__, args->data, ptr, args->size);
364 oldcpu = td->td_oncpu;
365 is_bound = cpu_sched_is_bound(td);
372 wrmsr_safe(MSR_K8_UCODE_UPDATE, (uintptr_t)args->data);
375 * Serialize instruction flow.
379 restore_cpu(oldcpu, is_bound, td);
383 contigfree(ptr, args->size, M_CPUCTL);
388 cpuctl_open(struct cdev *dev, int flags, int fmt __unused, struct thread *td)
394 if (cpu >= mp_ncpus || !cpu_enabled(cpu)) {
395 DPRINTF("[cpuctl,%d]: incorrect cpu number %d\n", __LINE__,
400 ret = securelevel_gt(td->td_ucred, 0);
405 cpuctl_modevent(module_t mod __unused, int type, void *data __unused)
411 if ((cpu_feature & CPUID_MSR) == 0) {
413 printf("cpuctl: not available.\n");
417 printf("cpuctl: access to MSR registers/cpuid info.\n");
418 cpuctl_devs = (struct cdev **)malloc(sizeof(void *) * mp_ncpus,
419 M_CPUCTL, M_WAITOK | M_ZERO);
420 if (cpuctl_devs == NULL) {
421 DPRINTF("[cpuctl,%d]: cannot allocate memory\n",
425 for (cpu = 0; cpu < mp_ncpus; cpu++)
426 if (cpu_enabled(cpu))
427 cpuctl_devs[cpu] = make_dev(&cpuctl_cdevsw, cpu,
428 UID_ROOT, GID_KMEM, 0640, "cpuctl%d", cpu);
431 for (cpu = 0; cpu < mp_ncpus; cpu++) {
432 if (cpuctl_devs[cpu] != NULL)
433 destroy_dev(cpuctl_devs[cpu]);
435 free(cpuctl_devs, M_CPUCTL);
445 DEV_MODULE(cpuctl, cpuctl_modevent, NULL);
446 MODULE_VERSION(cpuctl, CPUCTL_VERSION);