| #include <linux/init.h> |
| |
| #include <asm/x86_init.h> |
| #include <asm/apic.h> |
| #include <asm/xen/hypercall.h> |
| |
| #include <xen/xen.h> |
| #include <xen/interface/physdev.h> |
| #include "xen-ops.h" |
| #include "pmu.h" |
| #include "smp.h" |
| |
| static unsigned int xen_io_apic_read(unsigned apic, unsigned reg) |
| { |
| struct physdev_apic apic_op; |
| int ret; |
| |
| apic_op.apic_physbase = mpc_ioapic_addr(apic); |
| apic_op.reg = reg; |
| ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op); |
| if (!ret) |
| return apic_op.value; |
| |
| /* fallback to return an emulated IO_APIC values */ |
| if (reg == 0x1) |
| return 0x00170020; |
| else if (reg == 0x0) |
| return apic << 24; |
| |
| return 0xfd; |
| } |
| |
| static unsigned long xen_set_apic_id(unsigned int x) |
| { |
| WARN_ON(1); |
| return x; |
| } |
| |
| static unsigned int xen_get_apic_id(unsigned long x) |
| { |
| return ((x)>>24) & 0xFFu; |
| } |
| |
| static u32 xen_apic_read(u32 reg) |
| { |
| struct xen_platform_op op = { |
| .cmd = XENPF_get_cpuinfo, |
| .interface_version = XENPF_INTERFACE_VERSION, |
| .u.pcpu_info.xen_cpuid = 0, |
| }; |
| int ret = 0; |
| |
| /* Shouldn't need this as APIC is turned off for PV, and we only |
| * get called on the bootup processor. But just in case. */ |
| if (!xen_initial_domain() || smp_processor_id()) |
| return 0; |
| |
| if (reg == APIC_LVR) |
| return 0x10; |
| #ifdef CONFIG_X86_32 |
| if (reg == APIC_LDR) |
| return SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); |
| #endif |
| if (reg != APIC_ID) |
| return 0; |
| |
| ret = HYPERVISOR_platform_op(&op); |
| if (ret) |
| op.u.pcpu_info.apic_id = BAD_APICID; |
| |
| return op.u.pcpu_info.apic_id << 24; |
| } |
| |
| static void xen_apic_write(u32 reg, u32 val) |
| { |
| if (reg == APIC_LVTPC) { |
| (void)pmu_apic_update(reg); |
| return; |
| } |
| |
| /* Warn to see if there's any stray references */ |
| WARN(1,"register: %x, value: %x\n", reg, val); |
| } |
| |
| static u64 xen_apic_icr_read(void) |
| { |
| return 0; |
| } |
| |
| static void xen_apic_icr_write(u32 low, u32 id) |
| { |
| /* Warn to see if there's any stray references */ |
| WARN_ON(1); |
| } |
| |
| static u32 xen_safe_apic_wait_icr_idle(void) |
| { |
| return 0; |
| } |
| |
| static int xen_apic_probe_pv(void) |
| { |
| if (xen_pv_domain()) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int xen_madt_oem_check(char *oem_id, char *oem_table_id) |
| { |
| return xen_pv_domain(); |
| } |
| |
| static int xen_id_always_valid(int apicid) |
| { |
| return 1; |
| } |
| |
| static int xen_id_always_registered(void) |
| { |
| return 1; |
| } |
| |
| static int xen_phys_pkg_id(int initial_apic_id, int index_msb) |
| { |
| return initial_apic_id >> index_msb; |
| } |
| |
| #ifdef CONFIG_X86_32 |
| static int xen_x86_32_early_logical_apicid(int cpu) |
| { |
| /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */ |
| return 1 << cpu; |
| } |
| #endif |
| |
| static void xen_noop(void) |
| { |
| } |
| |
| static void xen_silent_inquire(int apicid) |
| { |
| } |
| |
| static int xen_cpu_present_to_apicid(int cpu) |
| { |
| if (cpu_present(cpu)) |
| return cpu_data(cpu).apicid; |
| else |
| return BAD_APICID; |
| } |
| |
| static struct apic xen_pv_apic = { |
| .name = "Xen PV", |
| .probe = xen_apic_probe_pv, |
| .acpi_madt_oem_check = xen_madt_oem_check, |
| .apic_id_valid = xen_id_always_valid, |
| .apic_id_registered = xen_id_always_registered, |
| |
| /* .irq_delivery_mode - used in native_compose_msi_msg only */ |
| /* .irq_dest_mode - used in native_compose_msi_msg only */ |
| |
| .target_cpus = default_target_cpus, |
| .disable_esr = 0, |
| /* .dest_logical - default_send_IPI_ use it but we use our own. */ |
| .check_apicid_used = default_check_apicid_used, /* Used on 32-bit */ |
| |
| .vector_allocation_domain = flat_vector_allocation_domain, |
| .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */ |
| |
| .ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */ |
| .setup_apic_routing = NULL, |
| .cpu_present_to_apicid = xen_cpu_present_to_apicid, |
| .apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */ |
| .check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */ |
| .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */ |
| |
| .get_apic_id = xen_get_apic_id, |
| .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */ |
| |
| .cpu_mask_to_apicid = flat_cpu_mask_to_apicid, |
| |
| #ifdef CONFIG_SMP |
| .send_IPI_mask = xen_send_IPI_mask, |
| .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself, |
| .send_IPI_allbutself = xen_send_IPI_allbutself, |
| .send_IPI_all = xen_send_IPI_all, |
| .send_IPI_self = xen_send_IPI_self, |
| #endif |
| /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */ |
| .inquire_remote_apic = xen_silent_inquire, |
| |
| .read = xen_apic_read, |
| .write = xen_apic_write, |
| .eoi_write = xen_apic_write, |
| |
| .icr_read = xen_apic_icr_read, |
| .icr_write = xen_apic_icr_write, |
| .wait_icr_idle = xen_noop, |
| .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle, |
| |
| #ifdef CONFIG_X86_32 |
| /* generic_processor_info and setup_local_APIC. */ |
| .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid, |
| #endif |
| }; |
| |
| static void __init xen_apic_check(void) |
| { |
| if (apic == &xen_pv_apic) |
| return; |
| |
| pr_info("Switched APIC routing from %s to %s.\n", apic->name, |
| xen_pv_apic.name); |
| apic = &xen_pv_apic; |
| } |
| void __init xen_init_apic(void) |
| { |
| x86_io_apic_ops.read = xen_io_apic_read; |
| /* On PV guests the APIC CPUID bit is disabled so none of the |
| * routines end up executing. */ |
| if (!xen_initial_domain()) |
| apic = &xen_pv_apic; |
| |
| x86_platform.apic_post_init = xen_apic_check; |
| } |
| apic_driver(xen_pv_apic); |