diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kernel/apic/x2apic_phys.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c new file mode 100644 index 000000000..896bc41cb --- /dev/null +++ b/arch/x86/kernel/apic/x2apic_phys.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/cpumask.h> +#include <linux/acpi.h> + +#include "local.h" + +int x2apic_phys; + +static struct apic apic_x2apic_phys; +static u32 x2apic_max_apicid __ro_after_init; + +void __init x2apic_set_max_apicid(u32 apicid) +{ + x2apic_max_apicid = apicid; +} + +static int __init set_x2apic_phys_mode(char *arg) +{ + x2apic_phys = 1; + return 0; +} +early_param("x2apic_phys", set_x2apic_phys_mode); + +static bool x2apic_fadt_phys(void) +{ +#ifdef CONFIG_ACPI + if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) && + (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { + printk(KERN_DEBUG "System requires x2apic physical mode\n"); + return true; + } +#endif + return false; +} + +static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) +{ + return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys()); +} + +static void x2apic_send_IPI(int cpu, int vector) +{ + u32 dest = per_cpu(x86_cpu_to_apicid, cpu); + + /* x2apic MSRs are special and need a special fence: */ + weak_wrmsr_fence(); + __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL); +} + +static void +__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) +{ + unsigned long query_cpu; + unsigned long this_cpu; + unsigned long flags; + + /* x2apic MSRs are special and need a special fence: */ + weak_wrmsr_fence(); + + local_irq_save(flags); + + this_cpu = smp_processor_id(); + for_each_cpu(query_cpu, mask) { + if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu) + continue; + __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu), + vector, APIC_DEST_PHYSICAL); + } + local_irq_restore(flags); +} + +static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) +{ + __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); +} + +static void + x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) +{ + __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); +} + +static void x2apic_send_IPI_allbutself(int vector) +{ + __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT); +} + +static void x2apic_send_IPI_all(int vector) +{ + __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC); +} + +static void init_x2apic_ldr(void) +{ +} + +static int x2apic_phys_probe(void) +{ + if (!x2apic_mode) + return 0; + + if (x2apic_phys || x2apic_fadt_phys()) + return 1; + + return apic == &apic_x2apic_phys; +} + +/* Common x2apic functions, also used by x2apic_cluster */ +int x2apic_apic_id_valid(u32 apicid) +{ + if (x2apic_max_apicid && apicid > x2apic_max_apicid) + return 0; + + return 1; +} + +int x2apic_apic_id_registered(void) +{ + return 1; +} + +void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest) +{ + unsigned long cfg = __prepare_ICR(0, vector, dest); + native_x2apic_icr_write(cfg, apicid); +} + +void __x2apic_send_IPI_shorthand(int vector, u32 which) +{ + unsigned long cfg = __prepare_ICR(which, vector, 0); + + /* x2apic MSRs are special and need a special fence: */ + weak_wrmsr_fence(); + native_x2apic_icr_write(cfg, 0); +} + +unsigned int x2apic_get_apic_id(unsigned long id) +{ + return id; +} + +u32 x2apic_set_apic_id(unsigned int id) +{ + return id; +} + +int x2apic_phys_pkg_id(int initial_apicid, int index_msb) +{ + return initial_apicid >> index_msb; +} + +void x2apic_send_IPI_self(int vector) +{ + apic_write(APIC_SELF_IPI, vector); +} + +static struct apic apic_x2apic_phys __ro_after_init = { + + .name = "physical x2apic", + .probe = x2apic_phys_probe, + .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, + .apic_id_valid = x2apic_apic_id_valid, + .apic_id_registered = x2apic_apic_id_registered, + + .delivery_mode = APIC_DELIVERY_MODE_FIXED, + .dest_mode_logical = false, + + .disable_esr = 0, + + .check_apicid_used = NULL, + .init_apic_ldr = init_x2apic_ldr, + .ioapic_phys_id_map = NULL, + .setup_apic_routing = NULL, + .cpu_present_to_apicid = default_cpu_present_to_apicid, + .apicid_to_cpu_present = NULL, + .check_phys_apicid_present = default_check_phys_apicid_present, + .phys_pkg_id = x2apic_phys_pkg_id, + + .get_apic_id = x2apic_get_apic_id, + .set_apic_id = x2apic_set_apic_id, + + .calc_dest_apicid = apic_default_calc_apicid, + + .send_IPI = x2apic_send_IPI, + .send_IPI_mask = x2apic_send_IPI_mask, + .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself, + .send_IPI_allbutself = x2apic_send_IPI_allbutself, + .send_IPI_all = x2apic_send_IPI_all, + .send_IPI_self = x2apic_send_IPI_self, + + .inquire_remote_apic = NULL, + + .read = native_apic_msr_read, + .write = native_apic_msr_write, + .eoi_write = native_apic_msr_eoi_write, + .icr_read = native_x2apic_icr_read, + .icr_write = native_x2apic_icr_write, + .wait_icr_idle = native_x2apic_wait_icr_idle, + .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle, +}; + +apic_driver(apic_x2apic_phys); |