diff options
Diffstat (limited to 'arch/x86/xen/apic.c')
| -rw-r--r-- | arch/x86/xen/apic.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c new file mode 100644 index 000000000..62d34b661 --- /dev/null +++ b/arch/x86/xen/apic.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/init.h> +#include <linux/thread_info.h> + +#include <asm/x86_init.h> +#include <asm/apic.h> +#include <asm/io_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 u32 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; + + /* 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 0x14; + 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(u32 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; +} + +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, + + /* .delivery_mode and .dest_mode_logical not used by XENPV */ + + .disable_esr = 0, + + .check_apicid_used = default_check_apicid_used, /* Used on 32-bit */ + .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. */ + + .calc_dest_apicid = apic_flat_calc_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, +}; + +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_apic_ops.io_apic_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); |