Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
31b3c9d7 | 2 | #include <linux/init.h> |
87e4baac | 3 | |
31b3c9d7 | 4 | #include <asm/x86_init.h> |
ab6ec39a | 5 | #include <asm/apic.h> |
ab6ec39a | 6 | #include <asm/xen/hypercall.h> |
31b3c9d7 | 7 | |
87e4baac IM |
8 | #include <xen/xen.h> |
9 | #include <xen/interface/physdev.h> | |
b8b0f559 | 10 | #include "xen-ops.h" |
6b08cd63 | 11 | #include "pmu.h" |
feb44f1f | 12 | #include "smp.h" |
87e4baac | 13 | |
b8b0f559 | 14 | static unsigned int xen_io_apic_read(unsigned apic, unsigned reg) |
31b3c9d7 | 15 | { |
ab6ec39a LM |
16 | struct physdev_apic apic_op; |
17 | int ret; | |
18 | ||
19 | apic_op.apic_physbase = mpc_ioapic_addr(apic); | |
20 | apic_op.reg = reg; | |
21 | ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op); | |
22 | if (!ret) | |
23 | return apic_op.value; | |
24 | ||
25 | /* fallback to return an emulated IO_APIC values */ | |
31b3c9d7 KRW |
26 | if (reg == 0x1) |
27 | return 0x00170020; | |
28 | else if (reg == 0x0) | |
29 | return apic << 24; | |
30 | ||
31 | return 0xfd; | |
32 | } | |
33 | ||
727657e6 | 34 | static u32 xen_set_apic_id(unsigned int x) |
feb44f1f KRW |
35 | { |
36 | WARN_ON(1); | |
37 | return x; | |
38 | } | |
39 | ||
40 | static unsigned int xen_get_apic_id(unsigned long x) | |
41 | { | |
42 | return ((x)>>24) & 0xFFu; | |
43 | } | |
44 | ||
45 | static u32 xen_apic_read(u32 reg) | |
46 | { | |
47 | struct xen_platform_op op = { | |
48 | .cmd = XENPF_get_cpuinfo, | |
49 | .interface_version = XENPF_INTERFACE_VERSION, | |
50 | .u.pcpu_info.xen_cpuid = 0, | |
51 | }; | |
52 | int ret = 0; | |
53 | ||
54 | /* Shouldn't need this as APIC is turned off for PV, and we only | |
55 | * get called on the bootup processor. But just in case. */ | |
56 | if (!xen_initial_domain() || smp_processor_id()) | |
57 | return 0; | |
58 | ||
59 | if (reg == APIC_LVR) | |
0f3922a9 | 60 | return 0x14; |
feb44f1f KRW |
61 | #ifdef CONFIG_X86_32 |
62 | if (reg == APIC_LDR) | |
63 | return SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); | |
64 | #endif | |
65 | if (reg != APIC_ID) | |
66 | return 0; | |
67 | ||
cfafae94 | 68 | ret = HYPERVISOR_platform_op(&op); |
feb44f1f | 69 | if (ret) |
ed6069be | 70 | op.u.pcpu_info.apic_id = BAD_APICID; |
feb44f1f KRW |
71 | |
72 | return op.u.pcpu_info.apic_id << 24; | |
73 | } | |
74 | ||
75 | static void xen_apic_write(u32 reg, u32 val) | |
76 | { | |
6b08cd63 BO |
77 | if (reg == APIC_LVTPC) { |
78 | (void)pmu_apic_update(reg); | |
65d0cf0b | 79 | return; |
6b08cd63 | 80 | } |
65d0cf0b | 81 | |
feb44f1f | 82 | /* Warn to see if there's any stray references */ |
b3b06c7e | 83 | WARN(1,"register: %x, value: %x\n", reg, val); |
feb44f1f KRW |
84 | } |
85 | ||
86 | static u64 xen_apic_icr_read(void) | |
87 | { | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static void xen_apic_icr_write(u32 low, u32 id) | |
92 | { | |
93 | /* Warn to see if there's any stray references */ | |
94 | WARN_ON(1); | |
95 | } | |
96 | ||
97 | static u32 xen_safe_apic_wait_icr_idle(void) | |
98 | { | |
99 | return 0; | |
100 | } | |
101 | ||
102 | static int xen_apic_probe_pv(void) | |
103 | { | |
104 | if (xen_pv_domain()) | |
105 | return 1; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int xen_madt_oem_check(char *oem_id, char *oem_table_id) | |
111 | { | |
112 | return xen_pv_domain(); | |
113 | } | |
114 | ||
a774635d | 115 | static int xen_id_always_valid(u32 apicid) |
feb44f1f KRW |
116 | { |
117 | return 1; | |
118 | } | |
119 | ||
120 | static int xen_id_always_registered(void) | |
121 | { | |
122 | return 1; | |
123 | } | |
124 | ||
125 | static int xen_phys_pkg_id(int initial_apic_id, int index_msb) | |
126 | { | |
127 | return initial_apic_id >> index_msb; | |
128 | } | |
129 | ||
130 | #ifdef CONFIG_X86_32 | |
131 | static int xen_x86_32_early_logical_apicid(int cpu) | |
132 | { | |
133 | /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */ | |
134 | return 1 << cpu; | |
135 | } | |
136 | #endif | |
137 | ||
138 | static void xen_noop(void) | |
139 | { | |
140 | } | |
141 | ||
142 | static void xen_silent_inquire(int apicid) | |
143 | { | |
144 | } | |
145 | ||
ed6069be BO |
146 | static int xen_cpu_present_to_apicid(int cpu) |
147 | { | |
148 | if (cpu_present(cpu)) | |
cc272163 | 149 | return cpu_data(cpu).apicid; |
ed6069be BO |
150 | else |
151 | return BAD_APICID; | |
152 | } | |
153 | ||
feb44f1f KRW |
154 | static struct apic xen_pv_apic = { |
155 | .name = "Xen PV", | |
156 | .probe = xen_apic_probe_pv, | |
157 | .acpi_madt_oem_check = xen_madt_oem_check, | |
158 | .apic_id_valid = xen_id_always_valid, | |
159 | .apic_id_registered = xen_id_always_registered, | |
160 | ||
161 | /* .irq_delivery_mode - used in native_compose_msi_msg only */ | |
162 | /* .irq_dest_mode - used in native_compose_msi_msg only */ | |
163 | ||
feb44f1f KRW |
164 | .disable_esr = 0, |
165 | /* .dest_logical - default_send_IPI_ use it but we use our own. */ | |
166 | .check_apicid_used = default_check_apicid_used, /* Used on 32-bit */ | |
167 | ||
feb44f1f KRW |
168 | .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */ |
169 | ||
170 | .ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */ | |
171 | .setup_apic_routing = NULL, | |
ed6069be | 172 | .cpu_present_to_apicid = xen_cpu_present_to_apicid, |
feb44f1f KRW |
173 | .apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */ |
174 | .check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */ | |
175 | .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */ | |
176 | ||
177 | .get_apic_id = xen_get_apic_id, | |
178 | .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */ | |
feb44f1f | 179 | |
9f9e3bb1 | 180 | .calc_dest_apicid = apic_flat_calc_apicid, |
feb44f1f KRW |
181 | |
182 | #ifdef CONFIG_SMP | |
183 | .send_IPI_mask = xen_send_IPI_mask, | |
184 | .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself, | |
185 | .send_IPI_allbutself = xen_send_IPI_allbutself, | |
186 | .send_IPI_all = xen_send_IPI_all, | |
187 | .send_IPI_self = xen_send_IPI_self, | |
188 | #endif | |
189 | /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */ | |
190 | .inquire_remote_apic = xen_silent_inquire, | |
191 | ||
192 | .read = xen_apic_read, | |
193 | .write = xen_apic_write, | |
194 | .eoi_write = xen_apic_write, | |
195 | ||
196 | .icr_read = xen_apic_icr_read, | |
197 | .icr_write = xen_apic_icr_write, | |
198 | .wait_icr_idle = xen_noop, | |
199 | .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle, | |
200 | ||
201 | #ifdef CONFIG_X86_32 | |
202 | /* generic_processor_info and setup_local_APIC. */ | |
203 | .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid, | |
204 | #endif | |
205 | }; | |
206 | ||
207 | static void __init xen_apic_check(void) | |
208 | { | |
209 | if (apic == &xen_pv_apic) | |
210 | return; | |
211 | ||
212 | pr_info("Switched APIC routing from %s to %s.\n", apic->name, | |
213 | xen_pv_apic.name); | |
214 | apic = &xen_pv_apic; | |
215 | } | |
31b3c9d7 KRW |
216 | void __init xen_init_apic(void) |
217 | { | |
51b146c5 | 218 | x86_apic_ops.io_apic_read = xen_io_apic_read; |
feb44f1f KRW |
219 | /* On PV guests the APIC CPUID bit is disabled so none of the |
220 | * routines end up executing. */ | |
221 | if (!xen_initial_domain()) | |
222 | apic = &xen_pv_apic; | |
223 | ||
224 | x86_platform.apic_post_init = xen_apic_check; | |
31b3c9d7 | 225 | } |
feb44f1f | 226 | apic_driver(xen_pv_apic); |