Re: [PATCH V3 2/5] X86: Hyper-V: Enable IPI enlightenments

From: kbuild test robot
Date: Sun May 20 2018 - 04:51:27 EST

Hi Srinivasan,

I love your patch! Yet something to improve:

[auto build test ERROR on v4.17-rc5]
[also build test ERROR on next-20180517]
[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/20180520-040432
config: x86_64-randconfig-s5-05201710 (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:70:10: 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:84:3: 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:154:12: 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:160:12: 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:173:12: 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:184:12: 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:190:12: 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:200:16: error: 'apic' undeclared (first use in this function)
orig_apic = *apic;
^~~~
arch/x86/hyperv/hv_apic.c:200:16: note: each undeclared identifier is reported only once for each function it appears in
>> arch/x86/hyperv/hv_apic.c:200:13: error: 'orig_apic' has an incomplete type 'struct apic'
orig_apic = *apic;
^
arch/x86/hyperv/hv_apic.c:212:3: 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:36:20: error: storage size of 'orig_apic' isn't known
static struct apic orig_apic;
^~~~~~~~~
cc1: some warnings being treated as errors

vim +154 arch/x86/hyperv/hv_apic.c

35
> 36 static struct apic orig_apic;
37
38 static u64 hv_apic_icr_read(void)
39 {
40 u64 reg_val;
41
42 rdmsrl(HV_X64_MSR_ICR, reg_val);
43 return reg_val;
44 }
45
46 static void hv_apic_icr_write(u32 low, u32 id)
47 {
48 u64 reg_val;
49
50 reg_val = SET_APIC_DEST_FIELD(id);
51 reg_val = reg_val << 32;
52 reg_val |= low;
53
54 wrmsrl(HV_X64_MSR_ICR, reg_val);
55 }
56
57 static u32 hv_apic_read(u32 reg)
58 {
59 u32 reg_val, hi;
60
61 switch (reg) {
62 case APIC_EOI:
63 rdmsr(HV_X64_MSR_EOI, reg_val, hi);
64 return reg_val;
65 case APIC_TASKPRI:
66 rdmsr(HV_X64_MSR_TPR, reg_val, hi);
67 return reg_val;
68
69 default:
70 return native_apic_mem_read(reg);
71 }
72 }
73
74 static void hv_apic_write(u32 reg, u32 val)
75 {
76 switch (reg) {
77 case APIC_EOI:
78 wrmsr(HV_X64_MSR_EOI, val, 0);
79 break;
80 case APIC_TASKPRI:
81 wrmsr(HV_X64_MSR_TPR, val, 0);
82 break;
83 default:
> 84 native_apic_mem_write(reg, val);
85 }
86 }
87
88 static void hv_apic_eoi_write(u32 reg, u32 val)
89 {
90 wrmsr(HV_X64_MSR_EOI, val, 0);
91 }
92
93 /*
94 * IPI implementation on Hyper-V.
95 */
96 static bool __send_ipi_mask(const struct cpumask *mask, int vector)
97 {
98 int cur_cpu, vcpu;
99 struct ipi_arg_non_ex **arg;
100 struct ipi_arg_non_ex *ipi_arg;
101 int ret = 1;
102 unsigned long flags;
103
104 if (cpumask_empty(mask))
105 return true;
106
107 if (!hv_hypercall_pg)
108 return false;
109
110 if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
111 return false;
112
113 local_irq_save(flags);
114 arg = (struct ipi_arg_non_ex **)this_cpu_ptr(hyperv_pcpu_input_arg);
115
116 ipi_arg = *arg;
117 if (unlikely(!ipi_arg))
118 goto ipi_mask_done;
119
120 ipi_arg->vector = vector;
121 ipi_arg->reserved = 0;
122 ipi_arg->cpu_mask = 0;
123
124 for_each_cpu(cur_cpu, mask) {
125 vcpu = hv_cpu_number_to_vp_number(cur_cpu);
126 /*
127 * This particular version of the IPI hypercall can
128 * only target upto 64 CPUs.
129 */
130 if (vcpu >= 64)
131 goto ipi_mask_done;
132
133 __set_bit(vcpu, (unsigned long *)&ipi_arg->cpu_mask);
134 }
135
136 ret = hv_do_hypercall(HVCALL_SEND_IPI, ipi_arg, NULL);
137
138 ipi_mask_done:
139 local_irq_restore(flags);
140 return ((ret == 0) ? true : false);
141 }
142
143 static bool __send_ipi_one(int cpu, int vector)
144 {
145 struct cpumask mask = CPU_MASK_NONE;
146
147 cpumask_set_cpu(cpu, &mask);
148 return __send_ipi_mask(&mask, vector);
149 }
150
151 static void hv_send_ipi(int cpu, int vector)
152 {
153 if (!__send_ipi_one(cpu, vector))
> 154 orig_apic.send_IPI(cpu, vector);
155 }
156
157 static void hv_send_ipi_mask(const struct cpumask *mask, int vector)
158 {
159 if (!__send_ipi_mask(mask, vector))
160 orig_apic.send_IPI_mask(mask, vector);
161 }
162
163 static void hv_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
164 {
165 unsigned int this_cpu = smp_processor_id();
166 struct cpumask new_mask;
167 const struct cpumask *local_mask;
168
169 cpumask_copy(&new_mask, mask);
170 cpumask_clear_cpu(this_cpu, &new_mask);
171 local_mask = &new_mask;
172 if (!__send_ipi_mask(local_mask, vector))
173 orig_apic.send_IPI_mask_allbutself(mask, vector);
174 }
175
176 static void hv_send_ipi_allbutself(int vector)
177 {
178 hv_send_ipi_mask_allbutself(cpu_online_mask, vector);
179 }
180
181 static void hv_send_ipi_all(int vector)
182 {
183 if (!__send_ipi_mask(cpu_online_mask, vector))
> 184 orig_apic.send_IPI_all(vector);
185 }
186
187 static void hv_send_ipi_self(int vector)
188 {
189 if (!__send_ipi_one(smp_processor_id(), vector))
> 190 orig_apic.send_IPI_self(vector);
191 }
192
193 void __init hv_apic_init(void)
194 {
195 if (ms_hyperv.hints & HV_X64_CLUSTER_IPI_RECOMMENDED) {
196 pr_info("Hyper-V: Using IPI hypercalls\n");
197 /*
198 * Set the IPI entry points.
199 */
> 200 orig_apic = *apic;
201
202 apic->send_IPI = hv_send_ipi;
203 apic->send_IPI_mask = hv_send_ipi_mask;
204 apic->send_IPI_mask_allbutself = hv_send_ipi_mask_allbutself;
205 apic->send_IPI_allbutself = hv_send_ipi_allbutself;
206 apic->send_IPI_all = hv_send_ipi_all;
207 apic->send_IPI_self = hv_send_ipi_self;
208 }
209
210 if (ms_hyperv.hints & HV_X64_APIC_ACCESS_RECOMMENDED) {
211 pr_info("Hyper-V: Using MSR based APIC access\n");
212 apic_set_eoi_write(hv_apic_eoi_write);
213 apic->read = hv_apic_read;
214 apic->write = hv_apic_write;
215 apic->icr_write = hv_apic_icr_write;
216 apic->icr_read = hv_apic_icr_read;
217 }
218 }
219

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