From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- arch/x86/kernel/apic/apic_noop.c | 145 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 145 insertions(+) create mode 100644 arch/x86/kernel/apic/apic_noop.c (limited to 'arch/x86/kernel/apic/apic_noop.c') diff --git a/arch/x86/kernel/apic/apic_noop.c b/arch/x86/kernel/apic/apic_noop.c new file mode 100644 index 000000000..780c70296 --- /dev/null +++ b/arch/x86/kernel/apic/apic_noop.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * NOOP APIC driver. + * + * Does almost nothing and should be substituted by a real apic driver via + * probe routine. + * + * Though in case if apic is disabled (for some reason) we try + * to not uglify the caller's code and allow to call (some) apic routines + * like self-ipi, etc... + */ +#include +#include + +#include + +static void noop_init_apic_ldr(void) { } +static void noop_send_IPI(int cpu, int vector) { } +static void noop_send_IPI_mask(const struct cpumask *cpumask, int vector) { } +static void noop_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) { } +static void noop_send_IPI_allbutself(int vector) { } +static void noop_send_IPI_all(int vector) { } +static void noop_send_IPI_self(int vector) { } +static void noop_apic_wait_icr_idle(void) { } +static void noop_apic_icr_write(u32 low, u32 id) { } + +static int noop_wakeup_secondary_cpu(int apicid, unsigned long start_eip) +{ + return -1; +} + +static u32 noop_safe_apic_wait_icr_idle(void) +{ + return 0; +} + +static u64 noop_apic_icr_read(void) +{ + return 0; +} + +static int noop_phys_pkg_id(int cpuid_apic, int index_msb) +{ + return 0; +} + +static unsigned int noop_get_apic_id(unsigned long x) +{ + return 0; +} + +static int noop_probe(void) +{ + /* + * NOOP apic should not ever be + * enabled via probe routine + */ + return 0; +} + +static int noop_apic_id_registered(void) +{ + /* + * if we would be really "pedantic" + * we should pass read_apic_id() here + * but since NOOP suppose APIC ID = 0 + * lets save a few cycles + */ + return physid_isset(0, phys_cpu_present_map); +} + +static u32 noop_apic_read(u32 reg) +{ + WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic); + return 0; +} + +static void noop_apic_write(u32 reg, u32 v) +{ + WARN_ON_ONCE(boot_cpu_has(X86_FEATURE_APIC) && !disable_apic); +} + +#ifdef CONFIG_X86_32 +static int noop_x86_32_early_logical_apicid(int cpu) +{ + return BAD_APICID; +} +#endif + +struct apic apic_noop __ro_after_init = { + .name = "noop", + .probe = noop_probe, + .acpi_madt_oem_check = NULL, + + .apic_id_valid = default_apic_id_valid, + .apic_id_registered = noop_apic_id_registered, + + .irq_delivery_mode = dest_Fixed, + /* logical delivery broadcast to all CPUs: */ + .irq_dest_mode = 1, + + .disable_esr = 0, + .dest_logical = APIC_DEST_LOGICAL, + .check_apicid_used = default_check_apicid_used, + + .init_apic_ldr = noop_init_apic_ldr, + + .ioapic_phys_id_map = default_ioapic_phys_id_map, + .setup_apic_routing = NULL, + + .cpu_present_to_apicid = default_cpu_present_to_apicid, + .apicid_to_cpu_present = physid_set_mask_of_physid, + + .check_phys_apicid_present = default_check_phys_apicid_present, + + .phys_pkg_id = noop_phys_pkg_id, + + .get_apic_id = noop_get_apic_id, + .set_apic_id = NULL, + + .calc_dest_apicid = apic_flat_calc_apicid, + + .send_IPI = noop_send_IPI, + .send_IPI_mask = noop_send_IPI_mask, + .send_IPI_mask_allbutself = noop_send_IPI_mask_allbutself, + .send_IPI_allbutself = noop_send_IPI_allbutself, + .send_IPI_all = noop_send_IPI_all, + .send_IPI_self = noop_send_IPI_self, + + .wakeup_secondary_cpu = noop_wakeup_secondary_cpu, + + .inquire_remote_apic = NULL, + + .read = noop_apic_read, + .write = noop_apic_write, + .eoi_write = noop_apic_write, + .icr_read = noop_apic_icr_read, + .icr_write = noop_apic_icr_write, + .wait_icr_idle = noop_apic_wait_icr_idle, + .safe_wait_icr_idle = noop_safe_apic_wait_icr_idle, + +#ifdef CONFIG_X86_32 + .x86_32_early_logical_apicid = noop_x86_32_early_logical_apicid, +#endif +}; -- cgit v1.2.3