197 lines
4.4 KiB
C
197 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
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*
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* Drives the local APIC in "clustered mode".
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*/
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/dmi.h>
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#include <linux/smp.h>
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#include <asm/apicdef.h>
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#include <asm/fixmap.h>
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#include <asm/mpspec.h>
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#include <asm/apic.h>
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#include <asm/ipi.h>
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static unsigned bigsmp_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 int bigsmp_apic_id_registered(void)
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{
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return 1;
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}
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static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
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{
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return false;
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}
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static int bigsmp_early_logical_apicid(int cpu)
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{
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/* on bigsmp, logical apicid is the same as physical */
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return early_per_cpu(x86_cpu_to_apicid, cpu);
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}
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/*
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* bigsmp enables physical destination mode
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* and doesn't use LDR and DFR
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*/
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static void bigsmp_init_apic_ldr(void)
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{
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}
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static void bigsmp_setup_apic_routing(void)
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{
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printk(KERN_INFO
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"Enabling APIC mode: Physflat. Using %d I/O APICs\n",
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nr_ioapics);
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}
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static int bigsmp_cpu_present_to_apicid(int mps_cpu)
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{
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if (mps_cpu < nr_cpu_ids)
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return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
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return BAD_APICID;
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}
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static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
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{
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/* For clustered we don't have a good way to do this yet - hack */
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physids_promote(0xFFL, retmap);
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}
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static int bigsmp_check_phys_apicid_present(int phys_apicid)
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{
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return 1;
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}
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static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
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{
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return cpuid_apic >> index_msb;
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}
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static void bigsmp_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 bigsmp_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 dmi_bigsmp; /* can be set by dmi scanners */
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static int hp_ht_bigsmp(const struct dmi_system_id *d)
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{
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printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
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dmi_bigsmp = 1;
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return 0;
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}
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static const struct dmi_system_id bigsmp_dmi_table[] = {
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{ hp_ht_bigsmp, "HP ProLiant DL760 G2",
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{ DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
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DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
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}
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},
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{ hp_ht_bigsmp, "HP ProLiant DL740",
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{ DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
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DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
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}
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},
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{ } /* NULL entry stops DMI scanning */
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};
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static int probe_bigsmp(void)
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{
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if (def_to_bigsmp)
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dmi_bigsmp = 1;
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else
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dmi_check_system(bigsmp_dmi_table);
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return dmi_bigsmp;
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}
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static struct apic apic_bigsmp __ro_after_init = {
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.name = "bigsmp",
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.probe = probe_bigsmp,
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.acpi_madt_oem_check = NULL,
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.apic_id_valid = default_apic_id_valid,
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.apic_id_registered = bigsmp_apic_id_registered,
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.irq_delivery_mode = dest_Fixed,
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/* phys delivery to target CPU: */
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.irq_dest_mode = 0,
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.disable_esr = 1,
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.dest_logical = 0,
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.check_apicid_used = bigsmp_check_apicid_used,
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.init_apic_ldr = bigsmp_init_apic_ldr,
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.ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
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.setup_apic_routing = bigsmp_setup_apic_routing,
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.cpu_present_to_apicid = bigsmp_cpu_present_to_apicid,
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.apicid_to_cpu_present = physid_set_mask_of_physid,
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.check_phys_apicid_present = bigsmp_check_phys_apicid_present,
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.phys_pkg_id = bigsmp_phys_pkg_id,
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.get_apic_id = bigsmp_get_apic_id,
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.set_apic_id = NULL,
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.calc_dest_apicid = apic_default_calc_apicid,
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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 = NULL,
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.send_IPI_allbutself = bigsmp_send_IPI_allbutself,
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.send_IPI_all = bigsmp_send_IPI_all,
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.send_IPI_self = default_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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.x86_32_early_logical_apicid = bigsmp_early_logical_apicid,
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};
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void __init generic_bigsmp_probe(void)
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{
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unsigned int cpu;
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if (!probe_bigsmp())
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return;
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apic = &apic_bigsmp;
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for_each_possible_cpu(cpu) {
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if (early_per_cpu(x86_cpu_to_logical_apicid,
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cpu) == BAD_APICID)
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continue;
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early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
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bigsmp_early_logical_apicid(cpu);
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}
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pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
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}
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apic_driver(apic_bigsmp);
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