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SubjectRe: [PATCH V2 2/5] X86: Hyper-V: Enable IPI enlightenments
Hi Srinivasan,

I love your patch! Yet something to improve:

[auto build test ERROR on v4.17-rc3]
[also build test ERROR on next-20180504]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/kys-linuxonhyperv-com/X86-Hyper-V-APIC-enlightenments/20180505-045627
config: x86_64-randconfig-a0-05050447 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64

All errors (new ones prefixed by >>):

arch/x86/hyperv/hv_apic.c: In function 'hv_apic_read':
arch/x86/hyperv/hv_apic.c:69:10: error: implicit declaration of function 'native_apic_mem_read'; did you mean 'hv_apic_icr_read'? [-Werror=implicit-function-declaration]
return native_apic_mem_read(reg);
^~~~~~~~~~~~~~~~~~~~
hv_apic_icr_read
arch/x86/hyperv/hv_apic.c: In function 'hv_apic_write':
arch/x86/hyperv/hv_apic.c:83:3: error: implicit declaration of function 'native_apic_mem_write'; did you mean 'hv_apic_icr_write'? [-Werror=implicit-function-declaration]
native_apic_mem_write(reg, val);
^~~~~~~~~~~~~~~~~~~~~
hv_apic_icr_write
arch/x86/hyperv/hv_apic.c: In function 'hv_send_ipi':
>> arch/x86/hyperv/hv_apic.c:153:12: error: invalid use of undefined type 'struct apic'
orig_apic.send_IPI(cpu, vector);
^
arch/x86/hyperv/hv_apic.c: In function 'hv_send_ipi_mask':
arch/x86/hyperv/hv_apic.c:159:12: error: invalid use of undefined type 'struct apic'
orig_apic.send_IPI_mask(mask, vector);
^
arch/x86/hyperv/hv_apic.c: In function 'hv_send_ipi_mask_allbutself':
arch/x86/hyperv/hv_apic.c:172:12: error: invalid use of undefined type 'struct apic'
orig_apic.send_IPI_mask_allbutself(mask, vector);
^
arch/x86/hyperv/hv_apic.c: In function 'hv_send_ipi_all':
arch/x86/hyperv/hv_apic.c:183:12: error: invalid use of undefined type 'struct apic'
orig_apic.send_IPI_all(vector);
^
arch/x86/hyperv/hv_apic.c: In function 'hv_send_ipi_self':
arch/x86/hyperv/hv_apic.c:189:12: error: invalid use of undefined type 'struct apic'
orig_apic.send_IPI_self(vector);
^
arch/x86/hyperv/hv_apic.c: In function 'hv_apic_init':
>> arch/x86/hyperv/hv_apic.c:199:16: error: 'apic' undeclared (first use in this function)
orig_apic = *apic;
^~~~
arch/x86/hyperv/hv_apic.c:199:16: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/hyperv/hv_apic.c:199:13: error: 'orig_apic' has an incomplete type 'struct apic'
orig_apic = *apic;
^
arch/x86/hyperv/hv_apic.c:211:3: error: implicit declaration of function 'apic_set_eoi_write'; did you mean 'hv_apic_eoi_write'? [-Werror=implicit-function-declaration]
apic_set_eoi_write(hv_apic_eoi_write);
^~~~~~~~~~~~~~~~~~
hv_apic_eoi_write
arch/x86/hyperv/hv_apic.c: At top level:
>> arch/x86/hyperv/hv_apic.c:35:20: error: storage size of 'orig_apic' isn't known
static struct apic orig_apic;
^~~~~~~~~
cc1: some warnings being treated as errors

vim +153 arch/x86/hyperv/hv_apic.c

34
> 35 static struct apic orig_apic;
36
37 static u64 hv_apic_icr_read(void)
38 {
39 u64 reg_val;
40
41 rdmsrl(HV_X64_MSR_ICR, reg_val);
42 return reg_val;
43 }
44
45 static void hv_apic_icr_write(u32 low, u32 id)
46 {
47 u64 reg_val;
48
49 reg_val = SET_APIC_DEST_FIELD(id);
50 reg_val = reg_val << 32;
51 reg_val |= low;
52
53 wrmsrl(HV_X64_MSR_ICR, reg_val);
54 }
55
56 static u32 hv_apic_read(u32 reg)
57 {
58 u32 reg_val, hi;
59
60 switch (reg) {
61 case APIC_EOI:
62 rdmsr(HV_X64_MSR_EOI, reg_val, hi);
63 return reg_val;
64 case APIC_TASKPRI:
65 rdmsr(HV_X64_MSR_TPR, reg_val, hi);
66 return reg_val;
67
68 default:
69 return native_apic_mem_read(reg);
70 }
71 }
72
73 static void hv_apic_write(u32 reg, u32 val)
74 {
75 switch (reg) {
76 case APIC_EOI:
77 wrmsr(HV_X64_MSR_EOI, val, 0);
78 break;
79 case APIC_TASKPRI:
80 wrmsr(HV_X64_MSR_TPR, val, 0);
81 break;
82 default:
> 83 native_apic_mem_write(reg, val);
84 }
85 }
86
87 static void hv_apic_eoi_write(u32 reg, u32 val)
88 {
89 wrmsr(HV_X64_MSR_EOI, val, 0);
90 }
91
92 /*
93 * IPI implementation on Hyper-V.
94 */
95 static bool __send_ipi_mask(const struct cpumask *mask, int vector)
96 {
97 int cur_cpu, vcpu;
98 struct ipi_arg_non_ex **arg;
99 struct ipi_arg_non_ex *ipi_arg;
100 int ret = 1;
101 unsigned long flags;
102
103 if (cpumask_empty(mask))
104 return true;
105
106 if (!hv_hypercall_pg)
107 return false;
108
109 if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
110 return false;
111
112 local_irq_save(flags);
113 arg = (struct ipi_arg_non_ex **)this_cpu_ptr(hyperv_pcpu_input_arg);
114
115 ipi_arg = *arg;
116 if (unlikely(!ipi_arg))
117 goto ipi_mask_done;
118
119 ipi_arg->vector = vector;
120 ipi_arg->reserved = 0;
121 ipi_arg->cpu_mask = 0;
122
123 for_each_cpu(cur_cpu, mask) {
124 vcpu = hv_cpu_number_to_vp_number(cur_cpu);
125 /*
126 * This particular version of the IPI hypercall can
127 * only target upto 64 CPUs.
128 */
129 if (vcpu >= 64)
130 goto ipi_mask_done;
131
132 __set_bit(vcpu, (unsigned long *)&ipi_arg->cpu_mask);
133 }
134
135 ret = hv_do_hypercall(HVCALL_SEND_IPI, ipi_arg, NULL);
136
137 ipi_mask_done:
138 local_irq_restore(flags);
139 return ((ret == 0) ? true : false);
140 }
141
142 static bool __send_ipi_one(int cpu, int vector)
143 {
144 struct cpumask mask = CPU_MASK_NONE;
145
146 cpumask_set_cpu(cpu, &mask);
147 return __send_ipi_mask(&mask, vector);
148 }
149
150 static void hv_send_ipi(int cpu, int vector)
151 {
152 if (!__send_ipi_one(cpu, vector))
> 153 orig_apic.send_IPI(cpu, vector);
154 }
155
156 static void hv_send_ipi_mask(const struct cpumask *mask, int vector)
157 {
158 if (!__send_ipi_mask(mask, vector))
159 orig_apic.send_IPI_mask(mask, vector);
160 }
161
162 static void hv_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
163 {
164 unsigned int this_cpu = smp_processor_id();
165 struct cpumask new_mask;
166 const struct cpumask *local_mask;
167
168 cpumask_copy(&new_mask, mask);
169 cpumask_clear_cpu(this_cpu, &new_mask);
170 local_mask = &new_mask;
171 if (!__send_ipi_mask(local_mask, vector))
172 orig_apic.send_IPI_mask_allbutself(mask, vector);
173 }
174
175 static void hv_send_ipi_allbutself(int vector)
176 {
177 hv_send_ipi_mask_allbutself(cpu_online_mask, vector);
178 }
179
180 static void hv_send_ipi_all(int vector)
181 {
182 if (!__send_ipi_mask(cpu_online_mask, vector))
> 183 orig_apic.send_IPI_all(vector);
184 }
185
186 static void hv_send_ipi_self(int vector)
187 {
188 if (!__send_ipi_one(smp_processor_id(), vector))
> 189 orig_apic.send_IPI_self(vector);
190 }
191
192 void __init hv_apic_init(void)
193 {
194 if (ms_hyperv.hints & HV_X64_CLUSTER_IPI_RECOMMENDED) {
195 pr_info("Hyper-V: Using IPI hypercalls\n");
196 /*
197 * Set the IPI entry points.
198 */
> 199 orig_apic = *apic;
200
201 apic->send_IPI = hv_send_ipi;
202 apic->send_IPI_mask = hv_send_ipi_mask;
203 apic->send_IPI_mask_allbutself = hv_send_ipi_mask_allbutself;
204 apic->send_IPI_allbutself = hv_send_ipi_allbutself;
205 apic->send_IPI_all = hv_send_ipi_all;
206 apic->send_IPI_self = hv_send_ipi_self;
207 }
208
209 if (ms_hyperv.hints & HV_X64_APIC_ACCESS_RECOMMENDED) {
210 pr_info("Hyper-V: Using MSR based APIC access\n");
211 apic_set_eoi_write(hv_apic_eoi_write);
212 apic->read = hv_apic_read;
213 apic->write = hv_apic_write;
214 apic->icr_write = hv_apic_icr_write;
215 apic->icr_read = hv_apic_icr_read;
216 }
217 }
218

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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