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 16 static 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 36 static u32 xen_get_apic_id(u32 x) 37 { 38 return ((x)>>24) & 0xFFu; 39 } 40 41 static u32 xen_apic_read(u32 reg) 42 { 43 struct xen_platform_op op = { 44 .cmd = XENPF_get_cpuinfo, 45 .interface_version = XENPF_INTERFACE_VERSION, 46 }; 47 int ret, cpu; 48 49 if (reg == APIC_LVR) 50 return 0x14; 51 if (reg != APIC_ID) 52 return 0; 53 54 cpu = smp_processor_id(); 55 if (!xen_initial_domain()) 56 return cpu ? cpuid_to_apicid[cpu] << 24 : 0; 57 58 op.u.pcpu_info.xen_cpuid = cpu; 59 60 ret = HYPERVISOR_platform_op(&op); 61 if (ret) 62 op.u.pcpu_info.apic_id = BAD_APICID; 63 64 return op.u.pcpu_info.apic_id << 24; 65 } 66 67 static void xen_apic_write(u32 reg, u32 val) 68 { 69 if (reg == APIC_LVTPC) { 70 (void)pmu_apic_update(reg); 71 return; 72 } 73 74 /* Warn to see if there's any stray references */ 75 WARN(1,"register: %x, value: %x\n", reg, val); 76 } 77 78 static void xen_apic_eoi(void) 79 { 80 WARN_ON_ONCE(1); 81 } 82 83 static u64 xen_apic_icr_read(void) 84 { 85 return 0; 86 } 87 88 static void xen_apic_icr_write(u32 low, u32 id) 89 { 90 /* Warn to see if there's any stray references */ 91 WARN_ON(1); 92 } 93 94 static int xen_apic_probe_pv(void) 95 { 96 if (xen_pv_domain()) 97 return 1; 98 99 return 0; 100 } 101 102 static int xen_madt_oem_check(char *oem_id, char *oem_table_id) 103 { 104 return xen_pv_domain(); 105 } 106 107 static u32 xen_cpu_present_to_apicid(int cpu) 108 { 109 if (cpu_present(cpu)) 110 return cpu_data(cpu).topo.apicid; 111 else 112 return BAD_APICID; 113 } 114 115 static struct apic xen_pv_apic __ro_after_init = { 116 .name = "Xen PV", 117 .probe = xen_apic_probe_pv, 118 .acpi_madt_oem_check = xen_madt_oem_check, 119 120 /* .delivery_mode and .dest_mode_logical not used by XENPV */ 121 122 .disable_esr = 0, 123 124 .cpu_present_to_apicid = xen_cpu_present_to_apicid, 125 126 .max_apic_id = UINT_MAX, 127 .get_apic_id = xen_get_apic_id, 128 129 .calc_dest_apicid = apic_flat_calc_apicid, 130 131 #ifdef CONFIG_SMP 132 .send_IPI_mask = xen_send_IPI_mask, 133 .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself, 134 .send_IPI_allbutself = xen_send_IPI_allbutself, 135 .send_IPI_all = xen_send_IPI_all, 136 .send_IPI_self = xen_send_IPI_self, 137 #endif 138 .read = xen_apic_read, 139 .write = xen_apic_write, 140 .eoi = xen_apic_eoi, 141 142 .icr_read = xen_apic_icr_read, 143 .icr_write = xen_apic_icr_write, 144 }; 145 apic_driver(xen_pv_apic); 146 147 void __init xen_init_apic(void) 148 { 149 x86_apic_ops.io_apic_read = xen_io_apic_read; 150 } 151