diff options
Diffstat (limited to 'arch/x86/kernel/apic/bigsmp_32.c')
-rw-r--r-- | arch/x86/kernel/apic/bigsmp_32.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c new file mode 100644 index 0000000000..0e5535add4 --- /dev/null +++ b/arch/x86/kernel/apic/bigsmp_32.c @@ -0,0 +1,126 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs. + * + * Drives the local APIC in "clustered mode". + */ +#include <linux/cpumask.h> +#include <linux/dmi.h> +#include <linux/smp.h> + +#include <asm/apic.h> +#include <asm/io_apic.h> + +#include "local.h" + +static unsigned bigsmp_get_apic_id(unsigned long x) +{ + return (x >> 24) & 0xFF; +} + +static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid) +{ + return false; +} + +static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap) +{ + /* For clustered we don't have a good way to do this yet - hack */ + physids_promote(0xFFL, retmap); +} + +static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb) +{ + return cpuid_apic >> index_msb; +} + +static void bigsmp_send_IPI_allbutself(int vector) +{ + default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); +} + +static void bigsmp_send_IPI_all(int vector) +{ + default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); +} + +static int dmi_bigsmp; /* can be set by dmi scanners */ + +static int hp_ht_bigsmp(const struct dmi_system_id *d) +{ + printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident); + dmi_bigsmp = 1; + + return 0; +} + + +static const struct dmi_system_id bigsmp_dmi_table[] = { + { hp_ht_bigsmp, "HP ProLiant DL760 G2", + { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), + DMI_MATCH(DMI_BIOS_VERSION, "P44-"), + } + }, + + { hp_ht_bigsmp, "HP ProLiant DL740", + { DMI_MATCH(DMI_BIOS_VENDOR, "HP"), + DMI_MATCH(DMI_BIOS_VERSION, "P47-"), + } + }, + { } /* NULL entry stops DMI scanning */ +}; + +static int probe_bigsmp(void) +{ + return dmi_check_system(bigsmp_dmi_table); +} + +static struct apic apic_bigsmp __ro_after_init = { + + .name = "bigsmp", + .probe = probe_bigsmp, + + .delivery_mode = APIC_DELIVERY_MODE_FIXED, + .dest_mode_logical = false, + + .disable_esr = 1, + + .check_apicid_used = bigsmp_check_apicid_used, + .ioapic_phys_id_map = bigsmp_ioapic_phys_id_map, + .cpu_present_to_apicid = default_cpu_present_to_apicid, + .phys_pkg_id = bigsmp_phys_pkg_id, + + .max_apic_id = 0xFE, + .get_apic_id = bigsmp_get_apic_id, + .set_apic_id = NULL, + + .calc_dest_apicid = apic_default_calc_apicid, + + .send_IPI = default_send_IPI_single_phys, + .send_IPI_mask = default_send_IPI_mask_sequence_phys, + .send_IPI_mask_allbutself = NULL, + .send_IPI_allbutself = bigsmp_send_IPI_allbutself, + .send_IPI_all = bigsmp_send_IPI_all, + .send_IPI_self = default_send_IPI_self, + + .read = native_apic_mem_read, + .write = native_apic_mem_write, + .eoi = native_apic_mem_eoi, + .icr_read = native_apic_icr_read, + .icr_write = native_apic_icr_write, + .wait_icr_idle = apic_mem_wait_icr_idle, + .safe_wait_icr_idle = apic_mem_wait_icr_idle_timeout, +}; + +bool __init apic_bigsmp_possible(bool cmdline_override) +{ + return apic == &apic_bigsmp || !cmdline_override; +} + +void __init apic_bigsmp_force(void) +{ + if (apic != &apic_bigsmp) + apic_install_driver(&apic_bigsmp); +} + +apic_driver(apic_bigsmp); |