intel/io/ucode_drv.c

	ucode_drv.c revision 9c1d4953b1540f5c51deba9b9684ca504ee2f46f
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/file.h>
#include <sys/errno.h>
#include <sys/open.h>
#include <sys/cred.h>
#include <sys/conf.h>
#include <sys/stat.h>
#include <sys/policy.h>
#include <sys/processor.h>
#include <sys/kmem.h>
#include <sys/modctl.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

#include <sys/auxv.h>
#include <sys/ucode.h>
#include <sys/systeminfo.h>
#include <sys/x86_archext.h>

static dev_info_t *ucode_devi;
static uint32_t ucode_max_combined_size;
static kmutex_t ucode_update_lock;

/*ARGSUSED*/
static int
ucode_getinfo(dev_info_t *devi, ddi_info_cmd_t cmd, void *arg, void **result)
{
    switch (cmd) {
    case DDI_INFO_DEVT2DEVINFO:
    case DDI_INFO_DEVT2INSTANCE:
        break;
    default:
        return (DDI_FAILURE);
    }

    switch (getminor((dev_t)arg)) {
    case UCODE_MINOR:
        break;
    default:
        return (DDI_FAILURE);
    }

    if (cmd == DDI_INFO_DEVT2INSTANCE)
        *result = 0;
    else
        *result = ucode_devi;
    return (DDI_SUCCESS);
}

static int
ucode_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
    ASSERT(cmd != DDI_RESUME);

    switch (cmd) {
    case DDI_RESUME:
        return (DDI_SUCCESS);

    case DDI_ATTACH:
        ucode_devi = devi;
        ucode_max_combined_size = UCODE_MAX_COMBINED_SIZE;

        if (ddi_create_minor_node(devi, UCODE_NODE_NAME, S_IFCHR,
            UCODE_MINOR, DDI_PSEUDO, 0) != DDI_SUCCESS) {
            cmn_err(CE_WARN, "%s: Unable to create minor node",
                UCODE_NODE_NAME);
            return (DDI_FAILURE);
        }
        ddi_report_dev(devi);
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }
}

static int
ucode_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
{
    /*
     * The power management and DR framework should never invoke this
     * driver with DDI_SUSPEND because the ucode pseudo device does not
     * have a reg property or hardware binding.  However, we will return
     * DDI_SUCCESS so that in the unlikely event that it does get
     * called, the system will still suspend and resume.
     */
    ASSERT(cmd != DDI_SUSPEND);

    switch (cmd) {
    case DDI_SUSPEND:
        return (DDI_SUCCESS);

    case DDI_DETACH:
        ddi_remove_minor_node(devi, NULL);
        ucode_devi = NULL;
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }
}

/*ARGSUSED1*/
static int
ucode_open(dev_t *dev, int flag, int otyp, cred_t *cr)
{
    return (getminor(*dev) == UCODE_MINOR ? 0 : ENXIO);
}


/*ARGSUSED*/
static int
ucode_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cr, int *rval)
{
    /*
     * Make sure that the ucode ops pointer has been set up.
     */
    if (!ucode)
        return (EIO);

    switch (cmd) {
    case UCODE_GET_VERSION: {
        int size;
        uint32_t *revp, *rev_array;
        size_t bufsz = NCPU * sizeof (*revp);
        ucode_errno_t rc = EM_OK;

        STRUCT_DECL(ucode_get_rev_struct, h);
        STRUCT_INIT(h, mode);
        if (ddi_copyin((void *)arg,
            STRUCT_BUF(h), STRUCT_SIZE(h), mode))
            return (EFAULT);

        if ((size = STRUCT_FGET(h, ugv_size)) > NCPU || size < 0)
            return (EINVAL);

        if (size == 0)
            return (0);

        if ((rev_array = STRUCT_FGETP(h, ugv_rev)) == NULL)
            return (EINVAL);

        size *= sizeof (uint32_t);

        /* Can't rely on caller for kernel's buffer size. */
        revp = kmem_zalloc(bufsz, KM_SLEEP);
        if (ddi_copyin((void *)rev_array, revp, size, mode) != 0) {
            kmem_free(revp, bufsz);
            return (EINVAL);
        }

        rc = ucode_get_rev(revp);

        STRUCT_FSET(h, ugv_errno, rc);

        if (ddi_copyout(revp, (void *)rev_array, size, mode) != 0) {
            kmem_free(revp, bufsz);
            return (EFAULT);
        }

        kmem_free(revp, bufsz);

        if (ddi_copyout(STRUCT_BUF(h), (void *)arg,
            STRUCT_SIZE(h), mode))
            return (EFAULT);

        return (0);
    }

    case UCODE_UPDATE: {
        int size;
        uint8_t *ucodep, *uw_ucode;
        ucode_errno_t rc = EM_OK;

        /*
         * Requires all privilege.
         */
        if (cr && secpolicy_ucode_update(cr))
            return (EPERM);

        STRUCT_DECL(ucode_write_struct, h);

        STRUCT_INIT(h, mode);
        if (ddi_copyin((void *)arg, STRUCT_BUF(h), STRUCT_SIZE(h),
            mode))
            return (EFAULT);

        /*
         * We allow the size of the combined microcode file to be up to
         * ucode_max_combined_size.  It is initialized to
         * UCODE_MAX_COMBINED_SIZE, and can be patched if necessary.
         */
        size = STRUCT_FGET(h, uw_size);
        if (size > ucode_max_combined_size || size == 0)
            return (EINVAL);

        if ((uw_ucode = STRUCT_FGETP(h, uw_ucode)) == NULL)
            return (EINVAL);

        ucodep = kmem_zalloc(size, KM_SLEEP);
        if (ddi_copyin((void *)uw_ucode, ucodep, size, mode) != 0) {
            kmem_free(ucodep, size);
            return (EFAULT);
        }

        if ((rc = ucode->validate(ucodep, size)) != EM_OK) {
            kmem_free(ucodep, size);
            STRUCT_FSET(h, uw_errno, rc);
            if (ddi_copyout(STRUCT_BUF(h), (void *)arg,
                STRUCT_SIZE(h), mode))
                return (EFAULT);
            return (0);
        }

        mutex_enter(&ucode_update_lock);
        rc = ucode_update(ucodep, size);
        mutex_exit(&ucode_update_lock);

        kmem_free(ucodep, size);

        STRUCT_FSET(h, uw_errno, rc);
        if (ddi_copyout(STRUCT_BUF(h), (void *)arg,
            STRUCT_SIZE(h), mode))
            return (EFAULT);

        /*
         * Even if rc is not EM_OK, it is a successful operation
         * from ioctl()'s perspective.  We return the detailed error
         * code via the ucode_write_struct data structure.
         */
        return (0);
    }


    default:
        return (ENOTTY);
    }
}

static struct cb_ops ucode_cb_ops = {
    ucode_open,
    nulldev,    /* close */
    nodev,      /* strategy */
    nodev,      /* print */
    nodev,      /* dump */
    nodev,      /* read */
    nodev,      /* write */
    ucode_ioctl,
    nodev,      /* devmap */
    nodev,      /* mmap */
    nodev,      /* segmap */
    nochpoll,   /* poll */
    ddi_prop_op,
    NULL,
    D_64BIT | D_NEW | D_MP
};

static struct dev_ops ucode_dv_ops = {
    DEVO_REV,
    0,
    ucode_getinfo,
    nulldev,        /* identify */
    nulldev,        /* probe */
    ucode_attach,
    ucode_detach,
    nodev,          /* reset */
    &ucode_cb_ops,
    (struct bus_ops *)0,
    NULL,           /* power */
    ddi_quiesce_not_needed,     /* quiesce */
};

static struct modldrv modldrv = {
    &mod_driverops,
    "ucode driver",
    &ucode_dv_ops
};

static struct modlinkage modl = {
    MODREV_1,
    &modldrv
};

int
_init(void)
{
    int rc;

    if ((rc = mod_install(&modl)) != 0)
        return (rc);

    mutex_init(&ucode_update_lock, NULL, MUTEX_DRIVER, NULL);

    return (0);
}

int
_fini(void)
{
    int rc;

    if ((rc = mod_remove(&modl)) != 0)
        return (rc);

    mutex_destroy(&ucode_update_lock);

    return (0);
}

int
_info(struct modinfo *modinfo)
{
    return (mod_info(&modl, modinfo));
}