setup.c

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/*
 *  64-bit pSeries and RS/6000 setup code.
 *
 *  Copyright (C) 1995  Linus Torvalds
 *  Adapted from 'alpha' version by Gary Thomas
 *  Modified by Cort Dougan ([email protected])
 *  Modified by PPC64 Team, IBM Corp
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

/*
 * bootup setup stuff..
 */

#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/major.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/utsname.h>
#include <linux/adb.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/cpuidle.h>

#include <asm/mmu.h>
#include <asm/processor.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/pci-bridge.h>
#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/time.h>
#include <asm/nvram.h>
#include <asm/pmc.h>
#include <asm/mpic.h>
#include <asm/xics.h>
#include <asm/ppc-pci.h>
#include <asm/i8259.h>
#include <asm/udbg.h>
#include <asm/smp.h>
#include <asm/firmware.h>
#include <asm/eeh.h>
#include <asm/pSeries_reconfig.h>

#include "plpar_wrappers.h"
#include "pseries.h"

int CMO_PrPSP = -1;
int CMO_SecPSP = -1;
unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
EXPORT_SYMBOL(CMO_PageSize);

int fwnmi_active;  /* TRUE if an FWNMI handler is present */

static struct device_node *pSeries_mpic_node;

static void pSeries_show_cpuinfo(struct seq_file *m)
{
    struct device_node *root;
    const char *model = "";

    root = of_find_node_by_path("/");
    if (root)
        model = of_get_property(root, "model", NULL);
    seq_printf(m, "machine\t\t: CHRP %s\n", model);
    of_node_put(root);
}

/* Initialize firmware assisted non-maskable interrupts if
 * the firmware supports this feature.
 */
static void __init fwnmi_init(void)
{
    unsigned long system_reset_addr, machine_check_addr;

    int ibm_nmi_register = rtas_token("ibm,nmi-register");
    if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
        return;

    /* If the kernel's not linked at zero we point the firmware at low
     * addresses anyway, and use a trampoline to get to the real code. */
    system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
    machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;

    if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
                machine_check_addr))
        fwnmi_active = 1;
}

static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
{
    struct irq_chip *chip = irq_desc_get_chip(desc);
    unsigned int cascade_irq = i8259_irq();

    if (cascade_irq != NO_IRQ)
        generic_handle_irq(cascade_irq);

    chip->irq_eoi(&desc->irq_data);
}

static void __init pseries_setup_i8259_cascade(void)
{
    struct device_node *np, *old, *found = NULL;
    unsigned int cascade;
    const u32 *addrp;
    unsigned long intack = 0;
    int naddr;

    for_each_node_by_type(np, "interrupt-controller") {
        if (of_device_is_compatible(np, "chrp,iic")) {
            found = np;
            break;
        }
    }

    if (found == NULL) {
        printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
        return;
    }

    cascade = irq_of_parse_and_map(found, 0);
    if (cascade == NO_IRQ) {
        printk(KERN_ERR "pic: failed to map cascade interrupt");
        return;
    }
    pr_debug("pic: cascade mapped to irq %d\n", cascade);

    for (old = of_node_get(found); old != NULL ; old = np) {
        np = of_get_parent(old);
        of_node_put(old);
        if (np == NULL)
            break;
        if (strcmp(np->name, "pci") != 0)
            continue;
        addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
        if (addrp == NULL)
            continue;
        naddr = of_n_addr_cells(np);
        intack = addrp[naddr-1];
        if (naddr > 1)
            intack |= ((unsigned long)addrp[naddr-2]) << 32;
    }
    if (intack)
        printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
    i8259_init(found, intack);
    of_node_put(found);
    irq_set_chained_handler(cascade, pseries_8259_cascade);
}

static void __init pseries_mpic_init_IRQ(void)
{
    struct device_node *np;
    const unsigned int *opprop;
    unsigned long openpic_addr = 0;
    int naddr, n, i, opplen;
    struct mpic *mpic;

    np = of_find_node_by_path("/");
    naddr = of_n_addr_cells(np);
    opprop = of_get_property(np, "platform-open-pic", &opplen);
    if (opprop != 0) {
        openpic_addr = of_read_number(opprop, naddr);
        printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
    }
    of_node_put(np);

    BUG_ON(openpic_addr == 0);

    /* Setup the openpic driver */
    mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
            MPIC_NO_RESET, 16, 0, " MPIC     ");
    BUG_ON(mpic == NULL);

    /* Add ISUs */
    opplen /= sizeof(u32);
    for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
        unsigned long isuaddr = of_read_number(opprop + i, naddr);
        mpic_assign_isu(mpic, n, isuaddr);
    }

    /* Setup top-level get_irq */
    ppc_md.get_irq = mpic_get_irq;

    /* All ISUs are setup, complete initialization */
    mpic_init(mpic);

    /* Look for cascade */
    pseries_setup_i8259_cascade();
}

static void __init pseries_xics_init_IRQ(void)
{
    xics_init();
    pseries_setup_i8259_cascade();
}

static void pseries_lpar_enable_pmcs(void)
{
    unsigned long set, reset;

    set = 1UL << 63;
    reset = 0;
    plpar_hcall_norets(H_PERFMON, set, reset);
}

static void __init pseries_discover_pic(void)
{
    struct device_node *np;
    const char *typep;

    for (np = NULL; (np = of_find_node_by_name(np,
                           "interrupt-controller"));) {
        typep = of_get_property(np, "compatible", NULL);
        if (strstr(typep, "open-pic")) {
            pSeries_mpic_node = of_node_get(np);
            ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
            setup_kexec_cpu_down_mpic();
            smp_init_pseries_mpic();
            return;
        } else if (strstr(typep, "ppc-xicp")) {
            ppc_md.init_IRQ       = pseries_xics_init_IRQ;
            setup_kexec_cpu_down_xics();
            smp_init_pseries_xics();
            return;
        }
    }
    printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
           " interrupt-controller\n");
}

static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
{
    struct device_node *np = node;
    struct pci_dn *pci = NULL;
    int err = NOTIFY_OK;

    switch (action) {
    case PSERIES_RECONFIG_ADD:
        pci = np->parent->data;
        if (pci) {
            update_dn_pci_info(np, pci->phb);

            /* Create EEH device for the OF node */
            eeh_dev_init(np, pci->phb);
        }
        break;
    default:
        err = NOTIFY_DONE;
        break;
    }
    return err;
}

static struct notifier_block pci_dn_reconfig_nb = {
    .notifier_call = pci_dn_reconfig_notifier,
};

struct kmem_cache *dtl_cache;

#ifdef CONFIG_VIRT_CPU_ACCOUNTING
/*
 * Allocate space for the dispatch trace log for all possible cpus
 * and register the buffers with the hypervisor.  This is used for
 * computing time stolen by the hypervisor.
 */
static int alloc_dispatch_logs(void)
{
    int cpu, ret;
    struct paca_struct *pp;
    struct dtl_entry *dtl;

    if (!firmware_has_feature(FW_FEATURE_SPLPAR))
        return 0;

    if (!dtl_cache)
        return 0;

    for_each_possible_cpu(cpu) {
        pp = &paca[cpu];
        dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
        if (!dtl) {
            pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
                cpu);
            pr_warn("Stolen time statistics will be unreliable\n");
            break;
        }

        pp->dtl_ridx = 0;
        pp->dispatch_log = dtl;
        pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
        pp->dtl_curr = dtl;
    }

    /* Register the DTL for the current (boot) cpu */
    dtl = get_paca()->dispatch_log;
    get_paca()->dtl_ridx = 0;
    get_paca()->dtl_curr = dtl;
    get_paca()->lppaca_ptr->dtl_idx = 0;

    /* hypervisor reads buffer length from this field */
    dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
    ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
    if (ret)
        pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
               "with %d\n", smp_processor_id(),
               hard_smp_processor_id(), ret);
    get_paca()->lppaca_ptr->dtl_enable_mask = 2;

    return 0;
}
#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
static inline int alloc_dispatch_logs(void)
{
    return 0;
}
#endif /* CONFIG_VIRT_CPU_ACCOUNTING */

static int alloc_dispatch_log_kmem_cache(void)
{
    dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
                        DISPATCH_LOG_BYTES, 0, NULL);
    if (!dtl_cache) {
        pr_warn("Failed to create dispatch trace log buffer cache\n");
        pr_warn("Stolen time statistics will be unreliable\n");
        return 0;
    }

    return alloc_dispatch_logs();
}
early_initcall(alloc_dispatch_log_kmem_cache);

static void pSeries_idle(void)
{
    /* This would call on the cpuidle framework, and the back-end pseries
     * driver to  go to idle states
     */
    if (cpuidle_idle_call()) {
        /* On error, execute default handler
         * to go into low thread priority and possibly
         * low power mode.
         */
        HMT_low();
        HMT_very_low();
    }
}

static void __init pSeries_setup_arch(void)
{
    panic_timeout = 10;

    /* Discover PIC type and setup ppc_md accordingly */
    pseries_discover_pic();

    /* openpic global configuration register (64-bit format). */
    /* openpic Interrupt Source Unit pointer (64-bit format). */
    /* python0 facility area (mmio) (64-bit format) REAL address. */

    /* init to some ~sane value until calibrate_delay() runs */
    loops_per_jiffy = 50000000;

    fwnmi_init();

    /* By default, only probe PCI (can be overriden by rtas_pci) */
    pci_add_flags(PCI_PROBE_ONLY);

    /* Find and initialize PCI host bridges */
    init_pci_config_tokens();
    find_and_init_phbs();
    pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);

    pSeries_nvram_init();

    if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
        vpa_init(boot_cpuid);
        ppc_md.power_save = pSeries_idle;
    }

    if (firmware_has_feature(FW_FEATURE_LPAR))
        ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
    else
        ppc_md.enable_pmcs = power4_enable_pmcs;
}

static int __init pSeries_init_panel(void)
{
    /* Manually leave the kernel version on the panel. */
    ppc_md.progress("Linux ppc64\n", 0);
    ppc_md.progress(init_utsname()->version, 0);

    return 0;
}
machine_arch_initcall(pseries, pSeries_init_panel);

static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
{
    return plpar_hcall_norets(H_SET_DABR, dabr);
}

static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
{
    /* Have to set at least one bit in the DABRX according to PAPR */
    if (dabrx == 0 && dabr == 0)
        dabrx = DABRX_USER;
    /* PAPR says we can only set kernel and user bits */
    dabrx &= DABRX_KERNEL | DABRX_USER;

    return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
}

#define CMO_CHARACTERISTICS_TOKEN 44
#define CMO_MAXLENGTH 1026

void pSeries_coalesce_init(void)
{
    struct hvcall_mpp_x_data mpp_x_data;

    if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
        powerpc_firmware_features |= FW_FEATURE_XCMO;
    else
        powerpc_firmware_features &= ~FW_FEATURE_XCMO;
}

void pSeries_cmo_feature_init(void)
{
    char *ptr, *key, *value, *end;
    int call_status;
    int page_order = IOMMU_PAGE_SHIFT;

    pr_debug(" -> fw_cmo_feature_init()\n");
    spin_lock(&rtas_data_buf_lock);
    memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
    call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
                NULL,
                CMO_CHARACTERISTICS_TOKEN,
                __pa(rtas_data_buf),
                RTAS_DATA_BUF_SIZE);

    if (call_status != 0) {
        spin_unlock(&rtas_data_buf_lock);
        pr_debug("CMO not available\n");
        pr_debug(" <- fw_cmo_feature_init()\n");
        return;
    }

    end = rtas_data_buf + CMO_MAXLENGTH - 2;
    ptr = rtas_data_buf + 2;    /* step over strlen value */
    key = value = ptr;

    while (*ptr && (ptr <= end)) {
        /* Separate the key and value by replacing '=' with '\0' and
         * point the value at the string after the '='
         */
        if (ptr[0] == '=') {
            ptr[0] = '\0';
            value = ptr + 1;
        } else if (ptr[0] == '\0' || ptr[0] == ',') {
            /* Terminate the string containing the key/value pair */
            ptr[0] = '\0';

            if (key == value) {
                pr_debug("Malformed key/value pair\n");
                /* Never found a '=', end processing */
                break;
            }

            if (0 == strcmp(key, "CMOPageSize"))
                page_order = simple_strtol(value, NULL, 10);
            else if (0 == strcmp(key, "PrPSP"))
                CMO_PrPSP = simple_strtol(value, NULL, 10);
            else if (0 == strcmp(key, "SecPSP"))
                CMO_SecPSP = simple_strtol(value, NULL, 10);
            value = key = ptr + 1;
        }
        ptr++;
    }

    /* Page size is returned as the power of 2 of the page size,
     * convert to the page size in bytes before returning
     */
    CMO_PageSize = 1 << page_order;
    pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);

    if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
        pr_info("CMO enabled\n");
        pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
                 CMO_SecPSP);
        powerpc_firmware_features |= FW_FEATURE_CMO;
        pSeries_coalesce_init();
    } else
        pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
                 CMO_SecPSP);
    spin_unlock(&rtas_data_buf_lock);
    pr_debug(" <- fw_cmo_feature_init()\n");
}

/*
 * Early initialization.  Relocation is on but do not reference unbolted pages
 */
static void __init pSeries_init_early(void)
{
    pr_debug(" -> pSeries_init_early()\n");

#ifdef CONFIG_HVC_CONSOLE
    if (firmware_has_feature(FW_FEATURE_LPAR))
        hvc_vio_init_early();
#endif
    if (firmware_has_feature(FW_FEATURE_XDABR))
        ppc_md.set_dabr = pseries_set_xdabr;
    else if (firmware_has_feature(FW_FEATURE_DABR))
        ppc_md.set_dabr = pseries_set_dabr;

    pSeries_cmo_feature_init();
    iommu_init_early_pSeries();

    pr_debug(" <- pSeries_init_early()\n");
}

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */

static int __init pSeries_probe_hypertas(unsigned long node,
                     const char *uname, int depth,
                     void *data)
{
    const char *hypertas;
    unsigned long len;

    if (depth != 1 ||
        (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
        return 0;

    hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
    if (!hypertas)
        return 1;

    powerpc_firmware_features |= FW_FEATURE_LPAR;
    fw_feature_init(hypertas, len);

    return 1;
}

static int __init pSeries_probe(void)
{
    unsigned long root = of_get_flat_dt_root();
    char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);

    if (dtype == NULL)
        return 0;
    if (strcmp(dtype, "chrp"))
        return 0;

    /* Cell blades firmware claims to be chrp while it's not. Until this
     * is fixed, we need to avoid those here.
     */
    if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
        of_flat_dt_is_compatible(root, "IBM,CBEA"))
        return 0;

    pr_debug("pSeries detected, looking for LPAR capability...\n");

    /* Now try to figure out if we are running on LPAR */
    of_scan_flat_dt(pSeries_probe_hypertas, NULL);

    if (firmware_has_feature(FW_FEATURE_LPAR))
        hpte_init_lpar();
    else
        hpte_init_native();

    pr_debug("Machine is%s LPAR !\n",
             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");

    return 1;
}

static int pSeries_pci_probe_mode(struct pci_bus *bus)
{
    if (firmware_has_feature(FW_FEATURE_LPAR))
        return PCI_PROBE_DEVTREE;
    return PCI_PROBE_NORMAL;
}

static void pSeries_power_off(void)
{
    int rc;
    int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");

    if (rtas_flash_term_hook)
        rtas_flash_term_hook(SYS_POWER_OFF);

    if (rtas_poweron_auto == 0 ||
        rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
        rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
        printk(KERN_INFO "RTAS power-off returned %d\n", rc);
    } else {
        rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
        printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
    }
    for (;;);
}

#ifndef CONFIG_PCI
void pSeries_final_fixup(void) { }
#endif

define_machine(pseries) {
    .name           = "pSeries",
    .probe          = pSeries_probe,
    .setup_arch     = pSeries_setup_arch,
    .init_early     = pSeries_init_early,
    .show_cpuinfo       = pSeries_show_cpuinfo,
    .log_error      = pSeries_log_error,
    .pcibios_fixup      = pSeries_final_fixup,
    .pci_probe_mode     = pSeries_pci_probe_mode,
    .restart        = rtas_restart,
    .power_off      = pSeries_power_off,
    .halt           = rtas_halt,
    .panic          = rtas_os_term,
    .get_boot_time      = rtas_get_boot_time,
    .get_rtc_time       = rtas_get_rtc_time,
    .set_rtc_time       = rtas_set_rtc_time,
    .calibrate_decr     = generic_calibrate_decr,
    .progress       = rtas_progress,
    .system_reset_exception = pSeries_system_reset_exception,
    .machine_check_exception = pSeries_machine_check_exception,
};