734 lines
18 KiB
C
734 lines
18 KiB
C
/*
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* 64-bit pSeries and RS/6000 setup code.
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*
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* Copyright (C) 1995 Linus Torvalds
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* Adapted from 'alpha' version by Gary Thomas
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* Modified by PPC64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* bootup setup stuff..
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*/
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#include <linux/cpu.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/user.h>
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#include <linux/tty.h>
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#include <linux/major.h>
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#include <linux/interrupt.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/console.h>
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#include <linux/pci.h>
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#include <linux/utsname.h>
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#include <linux/adb.h>
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#include <linux/export.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/seq_file.h>
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#include <linux/root_dev.h>
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#include <linux/cpuidle.h>
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#include <linux/of.h>
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#include <linux/kexec.h>
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#include <asm/mmu.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/pci-bridge.h>
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#include <asm/iommu.h>
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#include <asm/dma.h>
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#include <asm/machdep.h>
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#include <asm/irq.h>
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#include <asm/time.h>
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#include <asm/nvram.h>
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#include <asm/pmc.h>
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#include <asm/mpic.h>
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#include <asm/xics.h>
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#include <asm/ppc-pci.h>
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#include <asm/i8259.h>
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#include <asm/udbg.h>
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#include <asm/smp.h>
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#include <asm/firmware.h>
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#include <asm/eeh.h>
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#include "plpar_wrappers.h"
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#include "pseries.h"
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int CMO_PrPSP = -1;
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int CMO_SecPSP = -1;
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unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
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EXPORT_SYMBOL(CMO_PageSize);
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int fwnmi_active; /* TRUE if an FWNMI handler is present */
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static struct device_node *pSeries_mpic_node;
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static void pSeries_show_cpuinfo(struct seq_file *m)
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{
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struct device_node *root;
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const char *model = "";
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root = of_find_node_by_path("/");
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if (root)
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model = of_get_property(root, "model", NULL);
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seq_printf(m, "machine\t\t: CHRP %s\n", model);
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of_node_put(root);
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}
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/* Initialize firmware assisted non-maskable interrupts if
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* the firmware supports this feature.
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*/
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static void __init fwnmi_init(void)
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{
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unsigned long system_reset_addr, machine_check_addr;
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int ibm_nmi_register = rtas_token("ibm,nmi-register");
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if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
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return;
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/* If the kernel's not linked at zero we point the firmware at low
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* addresses anyway, and use a trampoline to get to the real code. */
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system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
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machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
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if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
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machine_check_addr))
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fwnmi_active = 1;
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}
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static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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unsigned int cascade_irq = i8259_irq();
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if (cascade_irq != NO_IRQ)
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generic_handle_irq(cascade_irq);
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chip->irq_eoi(&desc->irq_data);
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}
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static void __init pseries_setup_i8259_cascade(void)
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{
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struct device_node *np, *old, *found = NULL;
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unsigned int cascade;
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const u32 *addrp;
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unsigned long intack = 0;
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int naddr;
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for_each_node_by_type(np, "interrupt-controller") {
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if (of_device_is_compatible(np, "chrp,iic")) {
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found = np;
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break;
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}
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}
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if (found == NULL) {
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printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
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return;
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}
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cascade = irq_of_parse_and_map(found, 0);
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if (cascade == NO_IRQ) {
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printk(KERN_ERR "pic: failed to map cascade interrupt");
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return;
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}
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pr_debug("pic: cascade mapped to irq %d\n", cascade);
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for (old = of_node_get(found); old != NULL ; old = np) {
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np = of_get_parent(old);
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of_node_put(old);
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if (np == NULL)
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break;
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if (strcmp(np->name, "pci") != 0)
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continue;
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addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
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if (addrp == NULL)
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continue;
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naddr = of_n_addr_cells(np);
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intack = addrp[naddr-1];
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if (naddr > 1)
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intack |= ((unsigned long)addrp[naddr-2]) << 32;
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}
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if (intack)
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printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
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i8259_init(found, intack);
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of_node_put(found);
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irq_set_chained_handler(cascade, pseries_8259_cascade);
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}
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static void __init pseries_mpic_init_IRQ(void)
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{
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struct device_node *np;
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const unsigned int *opprop;
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unsigned long openpic_addr = 0;
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int naddr, n, i, opplen;
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struct mpic *mpic;
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np = of_find_node_by_path("/");
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naddr = of_n_addr_cells(np);
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opprop = of_get_property(np, "platform-open-pic", &opplen);
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if (opprop != 0) {
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openpic_addr = of_read_number(opprop, naddr);
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printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
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}
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of_node_put(np);
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BUG_ON(openpic_addr == 0);
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/* Setup the openpic driver */
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mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
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MPIC_NO_RESET, 16, 0, " MPIC ");
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BUG_ON(mpic == NULL);
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/* Add ISUs */
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opplen /= sizeof(u32);
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for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
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unsigned long isuaddr = of_read_number(opprop + i, naddr);
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mpic_assign_isu(mpic, n, isuaddr);
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}
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/* Setup top-level get_irq */
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ppc_md.get_irq = mpic_get_irq;
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/* All ISUs are setup, complete initialization */
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mpic_init(mpic);
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/* Look for cascade */
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pseries_setup_i8259_cascade();
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}
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static void __init pseries_xics_init_IRQ(void)
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{
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xics_init();
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pseries_setup_i8259_cascade();
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}
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static void pseries_lpar_enable_pmcs(void)
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{
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unsigned long set, reset;
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set = 1UL << 63;
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reset = 0;
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plpar_hcall_norets(H_PERFMON, set, reset);
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}
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static void __init pseries_discover_pic(void)
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{
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struct device_node *np;
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const char *typep;
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for (np = NULL; (np = of_find_node_by_name(np,
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"interrupt-controller"));) {
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typep = of_get_property(np, "compatible", NULL);
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if (strstr(typep, "open-pic")) {
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pSeries_mpic_node = of_node_get(np);
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ppc_md.init_IRQ = pseries_mpic_init_IRQ;
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setup_kexec_cpu_down_mpic();
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smp_init_pseries_mpic();
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return;
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} else if (strstr(typep, "ppc-xicp")) {
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ppc_md.init_IRQ = pseries_xics_init_IRQ;
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setup_kexec_cpu_down_xics();
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smp_init_pseries_xics();
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return;
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}
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}
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printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
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" interrupt-controller\n");
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}
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static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
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{
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struct device_node *np = node;
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struct pci_dn *pci = NULL;
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int err = NOTIFY_OK;
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switch (action) {
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case OF_RECONFIG_ATTACH_NODE:
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pci = np->parent->data;
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if (pci) {
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update_dn_pci_info(np, pci->phb);
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/* Create EEH device for the OF node */
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eeh_dev_init(np, pci->phb);
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}
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break;
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default:
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err = NOTIFY_DONE;
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break;
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}
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return err;
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}
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static struct notifier_block pci_dn_reconfig_nb = {
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.notifier_call = pci_dn_reconfig_notifier,
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};
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struct kmem_cache *dtl_cache;
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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/*
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* Allocate space for the dispatch trace log for all possible cpus
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* and register the buffers with the hypervisor. This is used for
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* computing time stolen by the hypervisor.
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*/
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static int alloc_dispatch_logs(void)
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{
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int cpu, ret;
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struct paca_struct *pp;
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struct dtl_entry *dtl;
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if (!firmware_has_feature(FW_FEATURE_SPLPAR))
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return 0;
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if (!dtl_cache)
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return 0;
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for_each_possible_cpu(cpu) {
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pp = &paca[cpu];
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dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
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if (!dtl) {
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pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
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cpu);
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pr_warn("Stolen time statistics will be unreliable\n");
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break;
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}
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pp->dtl_ridx = 0;
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pp->dispatch_log = dtl;
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pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
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pp->dtl_curr = dtl;
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}
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/* Register the DTL for the current (boot) cpu */
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dtl = get_paca()->dispatch_log;
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get_paca()->dtl_ridx = 0;
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get_paca()->dtl_curr = dtl;
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get_paca()->lppaca_ptr->dtl_idx = 0;
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/* hypervisor reads buffer length from this field */
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dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
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ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
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if (ret)
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pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
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"with %d\n", smp_processor_id(),
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hard_smp_processor_id(), ret);
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get_paca()->lppaca_ptr->dtl_enable_mask = 2;
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return 0;
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}
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#else /* !CONFIG_VIRT_CPU_ACCOUNTING */
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static inline int alloc_dispatch_logs(void)
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{
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return 0;
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}
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#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
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static int alloc_dispatch_log_kmem_cache(void)
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{
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dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
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DISPATCH_LOG_BYTES, 0, NULL);
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if (!dtl_cache) {
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pr_warn("Failed to create dispatch trace log buffer cache\n");
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pr_warn("Stolen time statistics will be unreliable\n");
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return 0;
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}
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return alloc_dispatch_logs();
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}
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early_initcall(alloc_dispatch_log_kmem_cache);
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static void pSeries_idle(void)
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{
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/* This would call on the cpuidle framework, and the back-end pseries
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* driver to go to idle states
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*/
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if (cpuidle_idle_call()) {
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/* On error, execute default handler
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* to go into low thread priority and possibly
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* low power mode.
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*/
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HMT_low();
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HMT_very_low();
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}
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}
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/*
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* Enable relocation on during exceptions. This has partition wide scope and
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* may take a while to complete, if it takes longer than one second we will
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* just give up rather than wasting any more time on this - if that turns out
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* to ever be a problem in practice we can move this into a kernel thread to
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* finish off the process later in boot.
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*/
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static int __init pSeries_enable_reloc_on_exc(void)
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{
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long rc;
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unsigned int delay, total_delay = 0;
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while (1) {
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rc = enable_reloc_on_exceptions();
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if (!H_IS_LONG_BUSY(rc))
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return rc;
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delay = get_longbusy_msecs(rc);
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total_delay += delay;
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if (total_delay > 1000) {
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pr_warn("Warning: Giving up waiting to enable "
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"relocation on exceptions (%u msec)!\n",
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total_delay);
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return rc;
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}
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mdelay(delay);
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}
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}
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#ifdef CONFIG_KEXEC
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static long pSeries_disable_reloc_on_exc(void)
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{
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long rc;
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while (1) {
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rc = disable_reloc_on_exceptions();
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if (!H_IS_LONG_BUSY(rc))
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return rc;
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mdelay(get_longbusy_msecs(rc));
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}
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}
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static void pSeries_machine_kexec(struct kimage *image)
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{
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long rc;
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if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
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(image->type != KEXEC_TYPE_CRASH)) {
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rc = pSeries_disable_reloc_on_exc();
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if (rc != H_SUCCESS)
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pr_warning("Warning: Failed to disable relocation on "
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"exceptions: %ld\n", rc);
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}
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default_machine_kexec(image);
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}
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#endif
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static void __init pSeries_setup_arch(void)
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{
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panic_timeout = 10;
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/* Discover PIC type and setup ppc_md accordingly */
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pseries_discover_pic();
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/* openpic global configuration register (64-bit format). */
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/* openpic Interrupt Source Unit pointer (64-bit format). */
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/* python0 facility area (mmio) (64-bit format) REAL address. */
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/* init to some ~sane value until calibrate_delay() runs */
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loops_per_jiffy = 50000000;
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fwnmi_init();
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/* By default, only probe PCI (can be overriden by rtas_pci) */
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pci_add_flags(PCI_PROBE_ONLY);
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/* Find and initialize PCI host bridges */
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init_pci_config_tokens();
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find_and_init_phbs();
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of_reconfig_notifier_register(&pci_dn_reconfig_nb);
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pSeries_nvram_init();
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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vpa_init(boot_cpuid);
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ppc_md.power_save = pSeries_idle;
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}
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if (firmware_has_feature(FW_FEATURE_LPAR))
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ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
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else
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ppc_md.enable_pmcs = power4_enable_pmcs;
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if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
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long rc;
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if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
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pr_warn("Unable to enable relocation on exceptions: "
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"%ld\n", rc);
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}
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}
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}
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static int __init pSeries_init_panel(void)
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{
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/* Manually leave the kernel version on the panel. */
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ppc_md.progress("Linux ppc64\n", 0);
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ppc_md.progress(init_utsname()->version, 0);
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return 0;
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}
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machine_arch_initcall(pseries, pSeries_init_panel);
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static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
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{
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return plpar_hcall_norets(H_SET_DABR, dabr);
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}
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static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
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{
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/* Have to set at least one bit in the DABRX according to PAPR */
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if (dabrx == 0 && dabr == 0)
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dabrx = DABRX_USER;
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/* PAPR says we can only set kernel and user bits */
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dabrx &= DABRX_KERNEL | DABRX_USER;
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return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
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}
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|
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#define CMO_CHARACTERISTICS_TOKEN 44
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#define CMO_MAXLENGTH 1026
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|
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void pSeries_coalesce_init(void)
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{
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struct hvcall_mpp_x_data mpp_x_data;
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if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
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powerpc_firmware_features |= FW_FEATURE_XCMO;
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else
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powerpc_firmware_features &= ~FW_FEATURE_XCMO;
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}
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|
|
/**
|
|
* fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
|
|
* handle that here. (Stolen from parse_system_parameter_string)
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* pSeries_power_off - tell firmware about how to power off the system.
|
|
*
|
|
* This function calls either the power-off rtas token in normal cases
|
|
* or the ibm,power-off-ups token (if present & requested) in case of
|
|
* a power failure. If power-off token is used, power on will only be
|
|
* possible with power button press. If ibm,power-off-ups token is used
|
|
* it will allow auto poweron after power is restored.
|
|
*/
|
|
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,
|
|
#ifdef CONFIG_KEXEC
|
|
.machine_kexec = pSeries_machine_kexec,
|
|
#endif
|
|
};
|