Commit | Line | Data |
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31b3c9d7 | 1 | #include <linux/init.h> |
87e4baac | 2 | |
31b3c9d7 | 3 | #include <asm/x86_init.h> |
ab6ec39a | 4 | #include <asm/apic.h> |
ab6ec39a | 5 | #include <asm/xen/hypercall.h> |
31b3c9d7 | 6 | |
87e4baac IM |
7 | #include <xen/xen.h> |
8 | #include <xen/interface/physdev.h> | |
b8b0f559 | 9 | #include "xen-ops.h" |
6b08cd63 | 10 | #include "pmu.h" |
feb44f1f | 11 | #include "smp.h" |
87e4baac | 12 | |
b8b0f559 | 13 | static unsigned int xen_io_apic_read(unsigned apic, unsigned reg) |
31b3c9d7 | 14 | { |
ab6ec39a LM |
15 | struct physdev_apic apic_op; |
16 | int ret; | |
17 | ||
18 | apic_op.apic_physbase = mpc_ioapic_addr(apic); | |
19 | apic_op.reg = reg; | |
20 | ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op); | |
21 | if (!ret) | |
22 | return apic_op.value; | |
23 | ||
24 | /* fallback to return an emulated IO_APIC values */ | |
31b3c9d7 KRW |
25 | if (reg == 0x1) |
26 | return 0x00170020; | |
27 | else if (reg == 0x0) | |
28 | return apic << 24; | |
29 | ||
30 | return 0xfd; | |
31 | } | |
32 | ||
feb44f1f KRW |
33 | static unsigned long xen_set_apic_id(unsigned int x) |
34 | { | |
35 | WARN_ON(1); | |
36 | return x; | |
37 | } | |
38 | ||
39 | static unsigned int xen_get_apic_id(unsigned long x) | |
40 | { | |
41 | return ((x)>>24) & 0xFFu; | |
42 | } | |
43 | ||
44 | static u32 xen_apic_read(u32 reg) | |
45 | { | |
46 | struct xen_platform_op op = { | |
47 | .cmd = XENPF_get_cpuinfo, | |
48 | .interface_version = XENPF_INTERFACE_VERSION, | |
49 | .u.pcpu_info.xen_cpuid = 0, | |
50 | }; | |
51 | int ret = 0; | |
52 | ||
53 | /* Shouldn't need this as APIC is turned off for PV, and we only | |
54 | * get called on the bootup processor. But just in case. */ | |
55 | if (!xen_initial_domain() || smp_processor_id()) | |
56 | return 0; | |
57 | ||
58 | if (reg == APIC_LVR) | |
59 | return 0x10; | |
60 | #ifdef CONFIG_X86_32 | |
61 | if (reg == APIC_LDR) | |
62 | return SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); | |
63 | #endif | |
64 | if (reg != APIC_ID) | |
65 | return 0; | |
66 | ||
cfafae94 | 67 | ret = HYPERVISOR_platform_op(&op); |
feb44f1f KRW |
68 | if (ret) |
69 | return 0; | |
70 | ||
71 | return op.u.pcpu_info.apic_id << 24; | |
72 | } | |
73 | ||
74 | static void xen_apic_write(u32 reg, u32 val) | |
75 | { | |
6b08cd63 BO |
76 | if (reg == APIC_LVTPC) { |
77 | (void)pmu_apic_update(reg); | |
65d0cf0b | 78 | return; |
6b08cd63 | 79 | } |
65d0cf0b | 80 | |
feb44f1f | 81 | /* Warn to see if there's any stray references */ |
b3b06c7e | 82 | WARN(1,"register: %x, value: %x\n", reg, val); |
feb44f1f KRW |
83 | } |
84 | ||
85 | static u64 xen_apic_icr_read(void) | |
86 | { | |
87 | return 0; | |
88 | } | |
89 | ||
90 | static void xen_apic_icr_write(u32 low, u32 id) | |
91 | { | |
92 | /* Warn to see if there's any stray references */ | |
93 | WARN_ON(1); | |
94 | } | |
95 | ||
96 | static u32 xen_safe_apic_wait_icr_idle(void) | |
97 | { | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static int xen_apic_probe_pv(void) | |
102 | { | |
103 | if (xen_pv_domain()) | |
104 | return 1; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int xen_madt_oem_check(char *oem_id, char *oem_table_id) | |
110 | { | |
111 | return xen_pv_domain(); | |
112 | } | |
113 | ||
114 | static int xen_id_always_valid(int apicid) | |
115 | { | |
116 | return 1; | |
117 | } | |
118 | ||
119 | static int xen_id_always_registered(void) | |
120 | { | |
121 | return 1; | |
122 | } | |
123 | ||
124 | static int xen_phys_pkg_id(int initial_apic_id, int index_msb) | |
125 | { | |
126 | return initial_apic_id >> index_msb; | |
127 | } | |
128 | ||
129 | #ifdef CONFIG_X86_32 | |
130 | static int xen_x86_32_early_logical_apicid(int cpu) | |
131 | { | |
132 | /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */ | |
133 | return 1 << cpu; | |
134 | } | |
135 | #endif | |
136 | ||
137 | static void xen_noop(void) | |
138 | { | |
139 | } | |
140 | ||
141 | static void xen_silent_inquire(int apicid) | |
142 | { | |
143 | } | |
144 | ||
145 | static struct apic xen_pv_apic = { | |
146 | .name = "Xen PV", | |
147 | .probe = xen_apic_probe_pv, | |
148 | .acpi_madt_oem_check = xen_madt_oem_check, | |
149 | .apic_id_valid = xen_id_always_valid, | |
150 | .apic_id_registered = xen_id_always_registered, | |
151 | ||
152 | /* .irq_delivery_mode - used in native_compose_msi_msg only */ | |
153 | /* .irq_dest_mode - used in native_compose_msi_msg only */ | |
154 | ||
155 | .target_cpus = default_target_cpus, | |
156 | .disable_esr = 0, | |
157 | /* .dest_logical - default_send_IPI_ use it but we use our own. */ | |
158 | .check_apicid_used = default_check_apicid_used, /* Used on 32-bit */ | |
159 | ||
160 | .vector_allocation_domain = flat_vector_allocation_domain, | |
161 | .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */ | |
162 | ||
163 | .ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */ | |
164 | .setup_apic_routing = NULL, | |
165 | .cpu_present_to_apicid = default_cpu_present_to_apicid, | |
166 | .apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */ | |
167 | .check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */ | |
168 | .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */ | |
169 | ||
170 | .get_apic_id = xen_get_apic_id, | |
171 | .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */ | |
172 | .apic_id_mask = 0xFF << 24, /* Used by verify_local_APIC. Match with what xen_get_apic_id does. */ | |
173 | ||
174 | .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and, | |
175 | ||
176 | #ifdef CONFIG_SMP | |
177 | .send_IPI_mask = xen_send_IPI_mask, | |
178 | .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself, | |
179 | .send_IPI_allbutself = xen_send_IPI_allbutself, | |
180 | .send_IPI_all = xen_send_IPI_all, | |
181 | .send_IPI_self = xen_send_IPI_self, | |
182 | #endif | |
183 | /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */ | |
184 | .inquire_remote_apic = xen_silent_inquire, | |
185 | ||
186 | .read = xen_apic_read, | |
187 | .write = xen_apic_write, | |
188 | .eoi_write = xen_apic_write, | |
189 | ||
190 | .icr_read = xen_apic_icr_read, | |
191 | .icr_write = xen_apic_icr_write, | |
192 | .wait_icr_idle = xen_noop, | |
193 | .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle, | |
194 | ||
195 | #ifdef CONFIG_X86_32 | |
196 | /* generic_processor_info and setup_local_APIC. */ | |
197 | .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid, | |
198 | #endif | |
199 | }; | |
200 | ||
201 | static void __init xen_apic_check(void) | |
202 | { | |
203 | if (apic == &xen_pv_apic) | |
204 | return; | |
205 | ||
206 | pr_info("Switched APIC routing from %s to %s.\n", apic->name, | |
207 | xen_pv_apic.name); | |
208 | apic = &xen_pv_apic; | |
209 | } | |
31b3c9d7 KRW |
210 | void __init xen_init_apic(void) |
211 | { | |
212 | x86_io_apic_ops.read = xen_io_apic_read; | |
feb44f1f KRW |
213 | /* On PV guests the APIC CPUID bit is disabled so none of the |
214 | * routines end up executing. */ | |
215 | if (!xen_initial_domain()) | |
216 | apic = &xen_pv_apic; | |
217 | ||
218 | x86_platform.apic_post_init = xen_apic_check; | |
31b3c9d7 | 219 | } |
feb44f1f | 220 | apic_driver(xen_pv_apic); |