xref: /illumos-gate/usr/src/uts/common/io/cpuid_drv.c (revision 56726c7e)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
519397407SSherry Moore  * Common Development and Distribution License (the "License").
619397407SSherry Moore  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217c478bd9Sstevel@tonic-gate /*
227417cfdeSKuriakose Kuruvilla  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
237c478bd9Sstevel@tonic-gate  */
24ebb8ac07SRobert Mustacchi /*
2512596538SJohn Levon  * Copyright 2019 Joyent, Inc.
26ab5bb018SKeith M Wesolowski  * Copyright 2022 Oxide Computer Co.
27ebb8ac07SRobert Mustacchi  */
287c478bd9Sstevel@tonic-gate 
297c478bd9Sstevel@tonic-gate 
307c478bd9Sstevel@tonic-gate #include <sys/types.h>
317c478bd9Sstevel@tonic-gate #include <sys/file.h>
327c478bd9Sstevel@tonic-gate #include <sys/errno.h>
337c478bd9Sstevel@tonic-gate #include <sys/open.h>
347c478bd9Sstevel@tonic-gate #include <sys/cred.h>
357c478bd9Sstevel@tonic-gate #include <sys/conf.h>
367c478bd9Sstevel@tonic-gate #include <sys/stat.h>
377c478bd9Sstevel@tonic-gate #include <sys/processor.h>
387c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h>
397c478bd9Sstevel@tonic-gate #include <sys/kmem.h>
407c478bd9Sstevel@tonic-gate #include <sys/modctl.h>
417c478bd9Sstevel@tonic-gate #include <sys/ddi.h>
427c478bd9Sstevel@tonic-gate #include <sys/sunddi.h>
4312596538SJohn Levon #include <sys/policy.h>
447c478bd9Sstevel@tonic-gate 
457c478bd9Sstevel@tonic-gate #include <sys/auxv.h>
467c478bd9Sstevel@tonic-gate #include <sys/cpuid_drv.h>
477c478bd9Sstevel@tonic-gate #include <sys/systeminfo.h>
487c478bd9Sstevel@tonic-gate 
497c478bd9Sstevel@tonic-gate #if defined(__x86)
507c478bd9Sstevel@tonic-gate #include <sys/x86_archext.h>
517c478bd9Sstevel@tonic-gate #endif
527c478bd9Sstevel@tonic-gate 
537c478bd9Sstevel@tonic-gate static dev_info_t *cpuid_devi;
547c478bd9Sstevel@tonic-gate 
557c478bd9Sstevel@tonic-gate /*ARGSUSED*/
567c478bd9Sstevel@tonic-gate static int
cpuid_getinfo(dev_info_t * devi,ddi_info_cmd_t cmd,void * arg,void ** result)577c478bd9Sstevel@tonic-gate cpuid_getinfo(dev_info_t *devi, ddi_info_cmd_t cmd, void *arg, void **result)
587c478bd9Sstevel@tonic-gate {
597c478bd9Sstevel@tonic-gate 	switch (cmd) {
607c478bd9Sstevel@tonic-gate 	case DDI_INFO_DEVT2DEVINFO:
617c478bd9Sstevel@tonic-gate 	case DDI_INFO_DEVT2INSTANCE:
627c478bd9Sstevel@tonic-gate 		break;
637c478bd9Sstevel@tonic-gate 	default:
647c478bd9Sstevel@tonic-gate 		return (DDI_FAILURE);
657c478bd9Sstevel@tonic-gate 	}
667c478bd9Sstevel@tonic-gate 
677c478bd9Sstevel@tonic-gate 	switch (getminor((dev_t)arg)) {
687c478bd9Sstevel@tonic-gate 	case CPUID_SELF_CPUID_MINOR:
697c478bd9Sstevel@tonic-gate 		break;
707c478bd9Sstevel@tonic-gate 	default:
717c478bd9Sstevel@tonic-gate 		return (DDI_FAILURE);
727c478bd9Sstevel@tonic-gate 	}
737c478bd9Sstevel@tonic-gate 
747c478bd9Sstevel@tonic-gate 	if (cmd == DDI_INFO_DEVT2INSTANCE)
757c478bd9Sstevel@tonic-gate 		*result = 0;
767c478bd9Sstevel@tonic-gate 	else
777c478bd9Sstevel@tonic-gate 		*result = cpuid_devi;
787c478bd9Sstevel@tonic-gate 	return (DDI_SUCCESS);
797c478bd9Sstevel@tonic-gate }
807c478bd9Sstevel@tonic-gate 
817c478bd9Sstevel@tonic-gate static int
cpuid_attach(dev_info_t * devi,ddi_attach_cmd_t cmd)827c478bd9Sstevel@tonic-gate cpuid_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
837c478bd9Sstevel@tonic-gate {
847c478bd9Sstevel@tonic-gate 	if (cmd != DDI_ATTACH)
857c478bd9Sstevel@tonic-gate 		return (DDI_FAILURE);
867c478bd9Sstevel@tonic-gate 	cpuid_devi = devi;
877c478bd9Sstevel@tonic-gate 
887c478bd9Sstevel@tonic-gate 	return (ddi_create_minor_node(devi, CPUID_DRIVER_SELF_NODE, S_IFCHR,
897c478bd9Sstevel@tonic-gate 	    CPUID_SELF_CPUID_MINOR, DDI_PSEUDO, 0));
907c478bd9Sstevel@tonic-gate }
917c478bd9Sstevel@tonic-gate 
927c478bd9Sstevel@tonic-gate static int
cpuid_detach(dev_info_t * devi,ddi_detach_cmd_t cmd)937c478bd9Sstevel@tonic-gate cpuid_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
947c478bd9Sstevel@tonic-gate {
957c478bd9Sstevel@tonic-gate 	if (cmd != DDI_DETACH)
967c478bd9Sstevel@tonic-gate 		return (DDI_FAILURE);
977c478bd9Sstevel@tonic-gate 	ddi_remove_minor_node(devi, NULL);
987c478bd9Sstevel@tonic-gate 	cpuid_devi = NULL;
997c478bd9Sstevel@tonic-gate 	return (DDI_SUCCESS);
1007c478bd9Sstevel@tonic-gate }
1017c478bd9Sstevel@tonic-gate 
1027c478bd9Sstevel@tonic-gate /*ARGSUSED1*/
1037c478bd9Sstevel@tonic-gate static int
cpuid_open(dev_t * dev,int flag,int otyp,cred_t * cr)1047c478bd9Sstevel@tonic-gate cpuid_open(dev_t *dev, int flag, int otyp, cred_t *cr)
1057c478bd9Sstevel@tonic-gate {
1067c478bd9Sstevel@tonic-gate 	return (getminor(*dev) == CPUID_SELF_CPUID_MINOR ? 0 : ENXIO);
1077c478bd9Sstevel@tonic-gate }
1087c478bd9Sstevel@tonic-gate 
1097c478bd9Sstevel@tonic-gate #if defined(_HAVE_CPUID_INSN)
1107c478bd9Sstevel@tonic-gate 
1117c478bd9Sstevel@tonic-gate /*ARGSUSED*/
1127c478bd9Sstevel@tonic-gate static int
cpuid_read(dev_t dev,uio_t * uio,cred_t * cr)1137c478bd9Sstevel@tonic-gate cpuid_read(dev_t dev, uio_t *uio, cred_t *cr)
1147c478bd9Sstevel@tonic-gate {
1158949bcd6Sandrei 	struct cpuid_regs crs;
1167c478bd9Sstevel@tonic-gate 	int error = 0;
1177c478bd9Sstevel@tonic-gate 
118ab5bb018SKeith M Wesolowski 	ASSERT(is_x86_feature(x86_featureset, X86FSET_CPUID));
1197c478bd9Sstevel@tonic-gate 
1207c478bd9Sstevel@tonic-gate 	if (uio->uio_resid & (sizeof (crs) - 1))
1217c478bd9Sstevel@tonic-gate 		return (EINVAL);
1227c478bd9Sstevel@tonic-gate 
1237c478bd9Sstevel@tonic-gate 	while (uio->uio_resid > 0) {
1247c478bd9Sstevel@tonic-gate 		u_offset_t uoff;
1257c478bd9Sstevel@tonic-gate 
1267c478bd9Sstevel@tonic-gate 		if ((uoff = (u_offset_t)uio->uio_loffset) > UINT_MAX) {
1277c478bd9Sstevel@tonic-gate 			error = EINVAL;
1287c478bd9Sstevel@tonic-gate 			break;
1297c478bd9Sstevel@tonic-gate 		}
1307c478bd9Sstevel@tonic-gate 
1318949bcd6Sandrei 		crs.cp_eax = (uint32_t)uoff;
1328949bcd6Sandrei 		crs.cp_ebx = crs.cp_ecx = crs.cp_edx = 0;
1338949bcd6Sandrei 		(void) cpuid_insn(NULL, &crs);
1347c478bd9Sstevel@tonic-gate 
1358949bcd6Sandrei 		if ((error = uiomove(&crs, sizeof (crs), UIO_READ, uio)) != 0)
1367c478bd9Sstevel@tonic-gate 			break;
1377c478bd9Sstevel@tonic-gate 		uio->uio_loffset = uoff + 1;
1387c478bd9Sstevel@tonic-gate 	}
1397c478bd9Sstevel@tonic-gate 
1407c478bd9Sstevel@tonic-gate 	return (error);
1417c478bd9Sstevel@tonic-gate }
1427c478bd9Sstevel@tonic-gate 
1437c478bd9Sstevel@tonic-gate #else
1447c478bd9Sstevel@tonic-gate 
1457c478bd9Sstevel@tonic-gate #define	cpuid_read	nodev
1467c478bd9Sstevel@tonic-gate 
1477c478bd9Sstevel@tonic-gate #endif	/* _HAVE_CPUID_INSN */
1487c478bd9Sstevel@tonic-gate 
1497c478bd9Sstevel@tonic-gate /*ARGSUSED*/
1507c478bd9Sstevel@tonic-gate static int
cpuid_ioctl(dev_t dev,int cmd,intptr_t arg,int mode,cred_t * cr,int * rval)1517c478bd9Sstevel@tonic-gate cpuid_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cr, int *rval)
1527c478bd9Sstevel@tonic-gate {
1537c478bd9Sstevel@tonic-gate 	char areq[16];
1547c478bd9Sstevel@tonic-gate 	void *ustr;
1557c478bd9Sstevel@tonic-gate 
1567c478bd9Sstevel@tonic-gate 	switch (cmd) {
1577c478bd9Sstevel@tonic-gate 	case CPUID_GET_HWCAP: {
1587c478bd9Sstevel@tonic-gate 		STRUCT_DECL(cpuid_get_hwcap, h);
1597c478bd9Sstevel@tonic-gate 
1607c478bd9Sstevel@tonic-gate 		STRUCT_INIT(h, mode);
1617c478bd9Sstevel@tonic-gate 		if (ddi_copyin((void *)arg,
1627c478bd9Sstevel@tonic-gate 		    STRUCT_BUF(h), STRUCT_SIZE(h), mode))
1637c478bd9Sstevel@tonic-gate 			return (EFAULT);
1647c478bd9Sstevel@tonic-gate 		if ((ustr = STRUCT_FGETP(h, cgh_archname)) != NULL &&
1657c478bd9Sstevel@tonic-gate 		    copyinstr(ustr, areq, sizeof (areq), NULL) != 0)
1667c478bd9Sstevel@tonic-gate 			return (EFAULT);
1677c478bd9Sstevel@tonic-gate 		areq[sizeof (areq) - 1] = '\0';
1687c478bd9Sstevel@tonic-gate 
169ebb8ac07SRobert Mustacchi 		if (strcmp(areq, architecture) == 0) {
170ebb8ac07SRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[0], auxv_hwcap);
171ebb8ac07SRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[1], auxv_hwcap_2);
172*56726c7eSRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[2], auxv_hwcap_3);
1737c478bd9Sstevel@tonic-gate #if defined(_SYSCALL32_IMPL)
174ebb8ac07SRobert Mustacchi 		} else if (strcmp(areq, architecture_32) == 0) {
175ebb8ac07SRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[0], auxv_hwcap32);
176ebb8ac07SRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[1], auxv_hwcap32_2);
177*56726c7eSRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[2], auxv_hwcap32_3);
1787c478bd9Sstevel@tonic-gate #endif
179ebb8ac07SRobert Mustacchi 		} else {
180ebb8ac07SRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[0], 0);
181ebb8ac07SRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[1], 0);
182*56726c7eSRobert Mustacchi 			STRUCT_FSET(h, cgh_hwcap[2], 0);
183ebb8ac07SRobert Mustacchi 		}
1847c478bd9Sstevel@tonic-gate 		if (ddi_copyout(STRUCT_BUF(h),
1857c478bd9Sstevel@tonic-gate 		    (void *)arg, STRUCT_SIZE(h), mode))
1867c478bd9Sstevel@tonic-gate 			return (EFAULT);
1877c478bd9Sstevel@tonic-gate 		return (0);
1887c478bd9Sstevel@tonic-gate 	}
1897c478bd9Sstevel@tonic-gate 
19012596538SJohn Levon #ifdef __x86
19112596538SJohn Levon 	case CPUID_RDMSR: {
19212596538SJohn Levon 		struct cpuid_rdmsr crm = { 0, };
19312596538SJohn Levon 		label_t label;
19412596538SJohn Levon 
19512596538SJohn Levon 		if (secpolicy_sys_config(cr, B_FALSE) != 0)
19612596538SJohn Levon 			return (EPERM);
19712596538SJohn Levon 
19812596538SJohn Levon 		if (ddi_copyin((void *)arg, &crm, sizeof (crm), mode))
19912596538SJohn Levon 			return (EFAULT);
20012596538SJohn Levon 
20112596538SJohn Levon 		kpreempt_disable();
20212596538SJohn Levon 
20312596538SJohn Levon 		if (on_fault(&label)) {
20412596538SJohn Levon 			kpreempt_enable();
20512596538SJohn Levon 			return (ENOENT);
20612596538SJohn Levon 		}
20712596538SJohn Levon 
20812596538SJohn Levon 		crm.cr_msr_val = rdmsr(crm.cr_msr_nr);
20912596538SJohn Levon 
21012596538SJohn Levon 		no_fault();
21112596538SJohn Levon 		kpreempt_enable();
21212596538SJohn Levon 
21312596538SJohn Levon 		if (ddi_copyout(&crm, (void *)arg, sizeof (crm), mode))
21412596538SJohn Levon 			return (EFAULT);
21512596538SJohn Levon 		return (0);
21612596538SJohn Levon 	}
21712596538SJohn Levon #endif
21812596538SJohn Levon 
2197c478bd9Sstevel@tonic-gate 	default:
2207c478bd9Sstevel@tonic-gate 		return (ENOTTY);
2217c478bd9Sstevel@tonic-gate 	}
2227c478bd9Sstevel@tonic-gate }
2237c478bd9Sstevel@tonic-gate 
2247c478bd9Sstevel@tonic-gate static struct cb_ops cpuid_cb_ops = {
2257c478bd9Sstevel@tonic-gate 	cpuid_open,
2267c478bd9Sstevel@tonic-gate 	nulldev,	/* close */
2277c478bd9Sstevel@tonic-gate 	nodev,		/* strategy */
2287c478bd9Sstevel@tonic-gate 	nodev,		/* print */
2297c478bd9Sstevel@tonic-gate 	nodev,		/* dump */
2307c478bd9Sstevel@tonic-gate 	cpuid_read,
2317c478bd9Sstevel@tonic-gate 	nodev,		/* write */
2327c478bd9Sstevel@tonic-gate 	cpuid_ioctl,
2337c478bd9Sstevel@tonic-gate 	nodev,		/* devmap */
2347c478bd9Sstevel@tonic-gate 	nodev,		/* mmap */
2357c478bd9Sstevel@tonic-gate 	nodev,		/* segmap */
2367c478bd9Sstevel@tonic-gate 	nochpoll,	/* poll */
2377c478bd9Sstevel@tonic-gate 	ddi_prop_op,
2387c478bd9Sstevel@tonic-gate 	NULL,
2397c478bd9Sstevel@tonic-gate 	D_64BIT | D_NEW | D_MP
2407c478bd9Sstevel@tonic-gate };
2417c478bd9Sstevel@tonic-gate 
2427c478bd9Sstevel@tonic-gate static struct dev_ops cpuid_dv_ops = {
2437c478bd9Sstevel@tonic-gate 	DEVO_REV,
2447c478bd9Sstevel@tonic-gate 	0,
2457c478bd9Sstevel@tonic-gate 	cpuid_getinfo,
2467c478bd9Sstevel@tonic-gate 	nulldev,	/* identify */
2477c478bd9Sstevel@tonic-gate 	nulldev,	/* probe */
2487c478bd9Sstevel@tonic-gate 	cpuid_attach,
2497c478bd9Sstevel@tonic-gate 	cpuid_detach,
2507c478bd9Sstevel@tonic-gate 	nodev,		/* reset */
2517c478bd9Sstevel@tonic-gate 	&cpuid_cb_ops,
25219397407SSherry Moore 	(struct bus_ops *)0,
25319397407SSherry Moore 	NULL,
25419397407SSherry Moore 	ddi_quiesce_not_needed,		/* quiesce */
2557c478bd9Sstevel@tonic-gate };
2567c478bd9Sstevel@tonic-gate 
2577c478bd9Sstevel@tonic-gate static struct modldrv modldrv = {
2587c478bd9Sstevel@tonic-gate 	&mod_driverops,
25919397407SSherry Moore 	"cpuid driver",
2607c478bd9Sstevel@tonic-gate 	&cpuid_dv_ops
2617c478bd9Sstevel@tonic-gate };
2627c478bd9Sstevel@tonic-gate 
2637c478bd9Sstevel@tonic-gate static struct modlinkage modl = {
2647c478bd9Sstevel@tonic-gate 	MODREV_1,
2657c478bd9Sstevel@tonic-gate 	&modldrv
2667c478bd9Sstevel@tonic-gate };
2677c478bd9Sstevel@tonic-gate 
2687c478bd9Sstevel@tonic-gate int
_init(void)2697c478bd9Sstevel@tonic-gate _init(void)
2707c478bd9Sstevel@tonic-gate {
2717c478bd9Sstevel@tonic-gate 	return (mod_install(&modl));
2727c478bd9Sstevel@tonic-gate }
2737c478bd9Sstevel@tonic-gate 
2747c478bd9Sstevel@tonic-gate int
_fini(void)2757c478bd9Sstevel@tonic-gate _fini(void)
2767c478bd9Sstevel@tonic-gate {
2777c478bd9Sstevel@tonic-gate 	return (mod_remove(&modl));
2787c478bd9Sstevel@tonic-gate }
2797c478bd9Sstevel@tonic-gate 
2807c478bd9Sstevel@tonic-gate int
_info(struct modinfo * modinfo)2817c478bd9Sstevel@tonic-gate _info(struct modinfo *modinfo)
2827c478bd9Sstevel@tonic-gate {
2837c478bd9Sstevel@tonic-gate 	return (mod_info(&modl, modinfo));
2847c478bd9Sstevel@tonic-gate }
285