forked from Minki/linux
a8adc0f091
Pull x86 cleanups from Ingo Molnar: "Header file and a wrapper functions cleanup" * 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86: Migrate exception table users off module.h and onto extable.h x86: Clean up various simple wrapper functions
295 lines
7.4 KiB
C
295 lines
7.4 KiB
C
/*
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* Copyright 2004 James Cleverdon, IBM.
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* Subject to the GNU Public License, v.2
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*
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* Flat APIC subarch code.
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*
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* Hacked for x86-64 by James Cleverdon from i386 architecture code by
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* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
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* James Cleverdon.
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*/
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#include <linux/errno.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/hardirq.h>
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#include <linux/export.h>
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#include <asm/smp.h>
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#include <asm/apic.h>
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#include <asm/ipi.h>
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#include <linux/acpi.h>
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static struct apic apic_physflat;
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static struct apic apic_flat;
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struct apic *apic __ro_after_init = &apic_flat;
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EXPORT_SYMBOL_GPL(apic);
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static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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return 1;
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}
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/*
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* Set up the logical destination ID.
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*
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* Intel recommends to set DFR, LDR and TPR before enabling
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* an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
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* document number 292116). So here it goes...
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*/
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void flat_init_apic_ldr(void)
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{
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unsigned long val;
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unsigned long num, id;
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num = smp_processor_id();
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id = 1UL << num;
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apic_write(APIC_DFR, APIC_DFR_FLAT);
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val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
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val |= SET_APIC_LOGICAL_ID(id);
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apic_write(APIC_LDR, val);
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}
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static void _flat_send_IPI_mask(unsigned long mask, int vector)
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{
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unsigned long flags;
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local_irq_save(flags);
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__default_send_IPI_dest_field(mask, vector, apic->dest_logical);
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local_irq_restore(flags);
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}
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static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
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{
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unsigned long mask = cpumask_bits(cpumask)[0];
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_flat_send_IPI_mask(mask, vector);
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}
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static void
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flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
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{
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unsigned long mask = cpumask_bits(cpumask)[0];
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int cpu = smp_processor_id();
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if (cpu < BITS_PER_LONG)
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clear_bit(cpu, &mask);
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_flat_send_IPI_mask(mask, vector);
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}
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static void flat_send_IPI_allbutself(int vector)
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{
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int cpu = smp_processor_id();
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#ifdef CONFIG_HOTPLUG_CPU
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int hotplug = 1;
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#else
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int hotplug = 0;
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#endif
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if (hotplug || vector == NMI_VECTOR) {
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if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
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unsigned long mask = cpumask_bits(cpu_online_mask)[0];
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if (cpu < BITS_PER_LONG)
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clear_bit(cpu, &mask);
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_flat_send_IPI_mask(mask, vector);
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}
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} else if (num_online_cpus() > 1) {
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__default_send_IPI_shortcut(APIC_DEST_ALLBUT,
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vector, apic->dest_logical);
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}
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}
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static void flat_send_IPI_all(int vector)
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{
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if (vector == NMI_VECTOR) {
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flat_send_IPI_mask(cpu_online_mask, vector);
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} else {
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__default_send_IPI_shortcut(APIC_DEST_ALLINC,
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vector, apic->dest_logical);
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}
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}
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static unsigned int flat_get_apic_id(unsigned long x)
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{
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return (x >> 24) & 0xFF;
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}
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static unsigned long set_apic_id(unsigned int id)
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{
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return (id & 0xFF) << 24;
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}
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static unsigned int read_xapic_id(void)
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{
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return flat_get_apic_id(apic_read(APIC_ID));
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}
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static int flat_apic_id_registered(void)
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{
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return physid_isset(read_xapic_id(), phys_cpu_present_map);
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}
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static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
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{
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return initial_apic_id >> index_msb;
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}
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static int flat_probe(void)
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{
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return 1;
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}
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static struct apic apic_flat __ro_after_init = {
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.name = "flat",
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.probe = flat_probe,
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.acpi_madt_oem_check = flat_acpi_madt_oem_check,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = flat_apic_id_registered,
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.irq_delivery_mode = dest_LowestPrio,
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.irq_dest_mode = 1, /* logical */
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.target_cpus = online_target_cpus,
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.disable_esr = 0,
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.dest_logical = APIC_DEST_LOGICAL,
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.check_apicid_used = NULL,
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.vector_allocation_domain = flat_vector_allocation_domain,
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.init_apic_ldr = flat_init_apic_ldr,
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.ioapic_phys_id_map = NULL,
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.setup_apic_routing = NULL,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = NULL,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.phys_pkg_id = flat_phys_pkg_id,
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.get_apic_id = flat_get_apic_id,
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.set_apic_id = set_apic_id,
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.cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
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.send_IPI = default_send_IPI_single,
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.send_IPI_mask = flat_send_IPI_mask,
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.send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
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.send_IPI_allbutself = flat_send_IPI_allbutself,
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.send_IPI_all = flat_send_IPI_all,
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.send_IPI_self = apic_send_IPI_self,
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.inquire_remote_apic = default_inquire_remote_apic,
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.read = native_apic_mem_read,
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.write = native_apic_mem_write,
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.eoi_write = native_apic_mem_write,
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.icr_read = native_apic_icr_read,
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.icr_write = native_apic_icr_write,
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.wait_icr_idle = native_apic_wait_icr_idle,
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
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};
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/*
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* Physflat mode is used when there are more than 8 CPUs on a system.
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* We cannot use logical delivery in this case because the mask
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* overflows, so use physical mode.
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*/
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static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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{
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#ifdef CONFIG_ACPI
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/*
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* Quirk: some x86_64 machines can only use physical APIC mode
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* regardless of how many processors are present (x86_64 ES7000
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* is an example).
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*/
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if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
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(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
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printk(KERN_DEBUG "system APIC only can use physical flat");
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return 1;
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}
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if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
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printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
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return 1;
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}
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#endif
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return 0;
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}
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static void physflat_send_IPI_allbutself(int vector)
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{
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default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
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}
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static void physflat_send_IPI_all(int vector)
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{
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default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
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}
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static int physflat_probe(void)
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{
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if (apic == &apic_physflat || num_possible_cpus() > 8)
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return 1;
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return 0;
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}
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static struct apic apic_physflat __ro_after_init = {
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.name = "physical flat",
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.probe = physflat_probe,
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.acpi_madt_oem_check = physflat_acpi_madt_oem_check,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = flat_apic_id_registered,
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.irq_delivery_mode = dest_Fixed,
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.irq_dest_mode = 0, /* physical */
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.target_cpus = online_target_cpus,
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.disable_esr = 0,
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.dest_logical = 0,
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.check_apicid_used = NULL,
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.vector_allocation_domain = default_vector_allocation_domain,
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/* not needed, but shouldn't hurt: */
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.init_apic_ldr = flat_init_apic_ldr,
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.ioapic_phys_id_map = NULL,
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.setup_apic_routing = NULL,
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.cpu_present_to_apicid = default_cpu_present_to_apicid,
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.apicid_to_cpu_present = NULL,
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.check_phys_apicid_present = default_check_phys_apicid_present,
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.phys_pkg_id = flat_phys_pkg_id,
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.get_apic_id = flat_get_apic_id,
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.set_apic_id = set_apic_id,
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.cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
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.send_IPI = default_send_IPI_single_phys,
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.send_IPI_mask = default_send_IPI_mask_sequence_phys,
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.send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys,
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.send_IPI_allbutself = physflat_send_IPI_allbutself,
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.send_IPI_all = physflat_send_IPI_all,
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.send_IPI_self = apic_send_IPI_self,
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.inquire_remote_apic = default_inquire_remote_apic,
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.read = native_apic_mem_read,
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.write = native_apic_mem_write,
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.eoi_write = native_apic_mem_write,
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.icr_read = native_apic_icr_read,
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.icr_write = native_apic_icr_write,
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.wait_icr_idle = native_apic_wait_icr_idle,
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.safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
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};
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/*
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* We need to check for physflat first, so this order is important.
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*/
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apic_drivers(apic_physflat, apic_flat);
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