io/pci/pci_kstats.c

	pci_kstats.c revision 843e19887f64dde75055cf8842fc4db2171eff45
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 *  Kstat support for X86 PCI driver
 */

#include <sys/conf.h>
#include <sys/mach_intr.h>
#include <sys/psm.h>
#include <sys/clock.h>
#include <sys/apic.h>
#include <io/pci/pci_var.h>

typedef struct pci_kstat_private {
    ddi_intr_handle_impl_t  *hdlp;
    dev_info_t      *rootnex_dip;
} pci_kstat_private_t;

static struct {
    kstat_named_t ihks_name;
    kstat_named_t ihks_type;
    kstat_named_t ihks_cpu;
    kstat_named_t ihks_pil;
    kstat_named_t ihks_time;
    kstat_named_t ihks_ino;
    kstat_named_t ihks_cookie;
    kstat_named_t ihks_devpath;
    kstat_named_t ihks_buspath;
} pci_ks_template = {
    { "name",   KSTAT_DATA_CHAR },
    { "type",   KSTAT_DATA_CHAR },
    { "cpu",    KSTAT_DATA_UINT64 },
    { "pil",    KSTAT_DATA_UINT64 },
    { "time",   KSTAT_DATA_UINT64 },
    { "ino",    KSTAT_DATA_UINT64 },
    { "cookie", KSTAT_DATA_UINT64 },
    { "devpath",    KSTAT_DATA_STRING },
    { "buspath",    KSTAT_DATA_STRING },
};

static char ih_devpath[MAXPATHLEN];
static char ih_buspath[MAXPATHLEN];
static uint32_t pci_ks_inst;
static kmutex_t pci_ks_template_lock;

/*ARGSUSED*/
static int
pci_ih_ks_update(kstat_t *ksp, int rw)
{
    pci_kstat_private_t *private_data =
        (pci_kstat_private_t *)ksp->ks_private;
    dev_info_t *rootnex_dip = private_data->rootnex_dip;
    ddi_intr_handle_impl_t *ih_p = private_data->hdlp;
    dev_info_t *dip = ih_p->ih_dip;
    int maxlen = sizeof (pci_ks_template.ihks_name.value.c);
    apic_get_intr_t intrinfo;

    (void) snprintf(pci_ks_template.ihks_name.value.c, maxlen, "%s%d",
        ddi_driver_name(dip), ddi_get_instance(dip));
    (void) ddi_pathname(dip, ih_devpath);
    (void) ddi_pathname(rootnex_dip, ih_buspath);
    kstat_named_setstr(&pci_ks_template.ihks_devpath, ih_devpath);
    kstat_named_setstr(&pci_ks_template.ihks_buspath, ih_buspath);

    /*
     * ih_p->ih_vector really has an IRQ.  Ask pci_get_intr_from_vecirq to
     * return a vector since that's what PCItool will require intrd to use.
     *
     * PCItool will change the CPU routing of the IRQ that vector maps to.
     *
     * Note that although possibly multiple vectors can map to an IRQ, the
     * vector returned below will always be the same for a given IRQ
     * specified, and so all kstats for a given IRQ will report the same
     * value for the ino field.
     *
     * ---
     *
     * Check for the enabled state, since kstats are set up when the ISR is
     * added, not enabled.  There may be a period where interrupts are not
     * enabled even though they may have been added.
     *
     * It is also possible that the vector is for a dummy interrupt.
     * pci_get_intr_from_vecirq will return failure in this case.
     */
    intrinfo.avgi_cpu_id = 0; /* In case pci_get_intr_from_vecirq fails */
    intrinfo.avgi_req_flags = PSMGI_REQ_CPUID | PSMGI_REQ_VECTOR;
    if ((ih_p->ih_state != DDI_IHDL_STATE_ENABLE) ||
        (pci_get_intr_from_vecirq(&intrinfo,  ih_p->ih_vector, IS_IRQ) !=
        DDI_SUCCESS) ||
        (intrinfo.avgi_cpu_id & PSMGI_CPU_FLAGS)) {

        (void) strcpy(pci_ks_template.ihks_type.value.c, "disabled");
        pci_ks_template.ihks_pil.value.ui64 = 0;
        pci_ks_template.ihks_time.value.ui64 = 0;
        pci_ks_template.ihks_cookie.value.ui64 = 0;
        pci_ks_template.ihks_cpu.value.ui64 = 0;
        pci_ks_template.ihks_ino.value.ui64 = 0;

        /* Interrupt is user-bound.  Remove kstat. */
        if (intrinfo.avgi_cpu_id & PSMGI_CPU_FLAGS)
            (void) taskq_dispatch(system_taskq,
                (void (*)(void *))pci_kstat_delete, ksp, TQ_SLEEP);

        return (0);
    }

    /*
     * Interrupt is valid (not a dummy), not user-bound to a specific cpu,
     * and enabled.  Update kstat fields.
     */
    switch (ih_p->ih_type) {
    case DDI_INTR_TYPE_MSI:
        (void) strcpy(pci_ks_template.ihks_type.value.c, "msi");
        break;
    case DDI_INTR_TYPE_MSIX:
        (void) strcpy(pci_ks_template.ihks_type.value.c, "msix");
        break;
    default:
        (void) strcpy(pci_ks_template.ihks_type.value.c, "fixed");
        break;
    }
    pci_ks_template.ihks_pil.value.ui64 = ih_p->ih_pri;
    pci_ks_template.ihks_time.value.ui64 =
        ((ihdl_plat_t *)ih_p->ih_private)->ip_ticks;
    scalehrtime((hrtime_t *)&pci_ks_template.ihks_time.value.ui64);
    pci_ks_template.ihks_cookie.value.ui64 = ih_p->ih_vector;
    /* CPU won't be user bound at this point. */
    pci_ks_template.ihks_cpu.value.ui64 = intrinfo.avgi_cpu_id;
    pci_ks_template.ihks_ino.value.ui64 = intrinfo.avgi_vector;

    return (0);
}


void pci_kstat_create(kstat_t **kspp, dev_info_t *rootnex_dip,
    ddi_intr_handle_impl_t *hdlp)
{
    pci_kstat_private_t *private_data;

    *kspp = kstat_create("pci_intrs", atomic_inc_32_nv(&pci_ks_inst),
        _MODULE_NAME, "interrupts", KSTAT_TYPE_NAMED,
        sizeof (pci_ks_template) / sizeof (kstat_named_t),
        KSTAT_FLAG_VIRTUAL);
    if (*kspp != NULL) {

        private_data =
            kmem_zalloc(sizeof (pci_kstat_private_t), KM_SLEEP);
        private_data->hdlp = hdlp;
        private_data->rootnex_dip = rootnex_dip;

        (*kspp)->ks_private = private_data;
        (*kspp)->ks_data_size += MAXPATHLEN * 2;
        (*kspp)->ks_lock = &pci_ks_template_lock;
        (*kspp)->ks_data = &pci_ks_template;
        (*kspp)->ks_update = pci_ih_ks_update;
        kstat_install(*kspp);
    }
}


/*
 * This function is invoked in two ways:
 * - Thru taskq thread via pci_ih_ks_update to remove kstats for user-bound
 *   interrupts.
 * - From the REMISR introp when an interrupt is being removed.
 */
void
pci_kstat_delete(kstat_t *ksp)
{
    pci_kstat_private_t *kstat_private;
    ddi_intr_handle_impl_t *hdlp;

    if (ksp) {
        kstat_private = ksp->ks_private;
        hdlp = kstat_private->hdlp;
        ((ihdl_plat_t *)hdlp->ih_private)->ip_ksp = NULL;

        /*
         * Delete the kstat before removing the private pointer, to
         * prevent a kstat update from coming after private is freed.
         */
        kstat_delete(ksp);

        kmem_free(kstat_private, sizeof (pci_kstat_private_t));
    }
}