1// SPDX-License-Identifier: GPL-2.0 2#include <linux/init.h> 3#include <linux/thread_info.h> 4 5#include <asm/x86_init.h> 6#include <asm/apic.h> 7#include <asm/io_apic.h> 8#include <asm/xen/hypercall.h> 9 10#include <xen/xen.h> 11#include <xen/interface/physdev.h> 12#include "xen-ops.h" 13#include "pmu.h" 14#include "smp.h" 15 16static unsigned int xen_io_apic_read(unsigned apic, unsigned reg) 17{ 18 struct physdev_apic apic_op; 19 int ret; 20 21 apic_op.apic_physbase = mpc_ioapic_addr(apic); 22 apic_op.reg = reg; 23 ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op); 24 if (!ret) 25 return apic_op.value; 26 27 /* fallback to return an emulated IO_APIC values */ 28 if (reg == 0x1) 29 return 0x00170020; 30 else if (reg == 0x0) 31 return apic << 24; 32 33 return 0xfd; 34} 35 36static u32 xen_set_apic_id(unsigned int x) 37{ 38 WARN_ON(1); 39 return x; 40} 41 42static unsigned int xen_get_apic_id(unsigned long x) 43{ 44 return ((x)>>24) & 0xFFu; 45} 46 47static u32 xen_apic_read(u32 reg) 48{ 49 struct xen_platform_op op = { 50 .cmd = XENPF_get_cpuinfo, 51 .interface_version = XENPF_INTERFACE_VERSION, 52 .u.pcpu_info.xen_cpuid = 0, 53 }; 54 int ret; 55 56 /* Shouldn't need this as APIC is turned off for PV, and we only 57 * get called on the bootup processor. But just in case. */ 58 if (!xen_initial_domain() || smp_processor_id()) 59 return 0; 60 61 if (reg == APIC_LVR) 62 return 0x14; 63 if (reg != APIC_ID) 64 return 0; 65 66 ret = HYPERVISOR_platform_op(&op); 67 if (ret) 68 op.u.pcpu_info.apic_id = BAD_APICID; 69 70 return op.u.pcpu_info.apic_id << 24; 71} 72 73static void xen_apic_write(u32 reg, u32 val) 74{ 75 if (reg == APIC_LVTPC) { 76 (void)pmu_apic_update(reg); 77 return; 78 } 79 80 /* Warn to see if there's any stray references */ 81 WARN(1,"register: %x, value: %x\n", reg, val); 82} 83 84static void xen_apic_eoi(void) 85{ 86 WARN_ON_ONCE(1); 87} 88 89static u64 xen_apic_icr_read(void) 90{ 91 return 0; 92} 93 94static void xen_apic_icr_write(u32 low, u32 id) 95{ 96 /* Warn to see if there's any stray references */ 97 WARN_ON(1); 98} 99 100static int xen_apic_probe_pv(void) 101{ 102 if (xen_pv_domain()) 103 return 1; 104 105 return 0; 106} 107 108static int xen_madt_oem_check(char *oem_id, char *oem_table_id) 109{ 110 return xen_pv_domain(); 111} 112 113static int xen_phys_pkg_id(int initial_apic_id, int index_msb) 114{ 115 return initial_apic_id >> index_msb; 116} 117 118static int xen_cpu_present_to_apicid(int cpu) 119{ 120 if (cpu_present(cpu)) 121 return cpu_data(cpu).apicid; 122 else 123 return BAD_APICID; 124} 125 126static struct apic xen_pv_apic __ro_after_init = { 127 .name = "Xen PV", 128 .probe = xen_apic_probe_pv, 129 .acpi_madt_oem_check = xen_madt_oem_check, 130 131 /* .delivery_mode and .dest_mode_logical not used by XENPV */ 132 133 .disable_esr = 0, 134 135 .cpu_present_to_apicid = xen_cpu_present_to_apicid, 136 .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */ 137 138 .max_apic_id = UINT_MAX, 139 .get_apic_id = xen_get_apic_id, 140 .set_apic_id = xen_set_apic_id, 141 142 .calc_dest_apicid = apic_flat_calc_apicid, 143 144#ifdef CONFIG_SMP 145 .send_IPI_mask = xen_send_IPI_mask, 146 .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself, 147 .send_IPI_allbutself = xen_send_IPI_allbutself, 148 .send_IPI_all = xen_send_IPI_all, 149 .send_IPI_self = xen_send_IPI_self, 150#endif 151 .read = xen_apic_read, 152 .write = xen_apic_write, 153 .eoi = xen_apic_eoi, 154 155 .icr_read = xen_apic_icr_read, 156 .icr_write = xen_apic_icr_write, 157}; 158apic_driver(xen_pv_apic); 159 160void __init xen_init_apic(void) 161{ 162 x86_apic_ops.io_apic_read = xen_io_apic_read; 163} 164