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Linux/arch/x86/kernel/apic/x2apic_cluster.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/threads.h>
  3 #include <linux/cpumask.h>
  4 #include <linux/string.h>
  5 #include <linux/kernel.h>
  6 #include <linux/ctype.h>
  7 #include <linux/dmar.h>
  8 #include <linux/irq.h>
  9 #include <linux/cpu.h>
 10 
 11 #include <asm/smp.h>
 12 #include "x2apic.h"
 13 
 14 struct cluster_mask {
 15         unsigned int    clusterid;
 16         int             node;
 17         struct cpumask  mask;
 18 };
 19 
 20 static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
 21 static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
 22 static DEFINE_PER_CPU(struct cluster_mask *, cluster_masks);
 23 static struct cluster_mask *cluster_hotplug_mask;
 24 
 25 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 26 {
 27         return x2apic_enabled();
 28 }
 29 
 30 static void x2apic_send_IPI(int cpu, int vector)
 31 {
 32         u32 dest = per_cpu(x86_cpu_to_logical_apicid, cpu);
 33 
 34         x2apic_wrmsr_fence();
 35         __x2apic_send_IPI_dest(dest, vector, APIC_DEST_LOGICAL);
 36 }
 37 
 38 static void
 39 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
 40 {
 41         unsigned int cpu, clustercpu;
 42         struct cpumask *tmpmsk;
 43         unsigned long flags;
 44         u32 dest;
 45 
 46         x2apic_wrmsr_fence();
 47         local_irq_save(flags);
 48 
 49         tmpmsk = this_cpu_cpumask_var_ptr(ipi_mask);
 50         cpumask_copy(tmpmsk, mask);
 51         /* If IPI should not be sent to self, clear current CPU */
 52         if (apic_dest != APIC_DEST_ALLINC)
 53                 cpumask_clear_cpu(smp_processor_id(), tmpmsk);
 54 
 55         /* Collapse cpus in a cluster so a single IPI per cluster is sent */
 56         for_each_cpu(cpu, tmpmsk) {
 57                 struct cluster_mask *cmsk = per_cpu(cluster_masks, cpu);
 58 
 59                 dest = 0;
 60                 for_each_cpu_and(clustercpu, tmpmsk, &cmsk->mask)
 61                         dest |= per_cpu(x86_cpu_to_logical_apicid, clustercpu);
 62 
 63                 if (!dest)
 64                         continue;
 65 
 66                 __x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
 67                 /* Remove cluster CPUs from tmpmask */
 68                 cpumask_andnot(tmpmsk, tmpmsk, &cmsk->mask);
 69         }
 70 
 71         local_irq_restore(flags);
 72 }
 73 
 74 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
 75 {
 76         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
 77 }
 78 
 79 static void
 80 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
 81 {
 82         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
 83 }
 84 
 85 static void x2apic_send_IPI_allbutself(int vector)
 86 {
 87         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
 88 }
 89 
 90 static void x2apic_send_IPI_all(int vector)
 91 {
 92         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
 93 }
 94 
 95 static u32 x2apic_calc_apicid(unsigned int cpu)
 96 {
 97         return per_cpu(x86_cpu_to_logical_apicid, cpu);
 98 }
 99 
100 static void init_x2apic_ldr(void)
101 {
102         struct cluster_mask *cmsk = this_cpu_read(cluster_masks);
103         u32 cluster, apicid = apic_read(APIC_LDR);
104         unsigned int cpu;
105 
106         this_cpu_write(x86_cpu_to_logical_apicid, apicid);
107 
108         if (cmsk)
109                 goto update;
110 
111         cluster = apicid >> 16;
112         for_each_online_cpu(cpu) {
113                 cmsk = per_cpu(cluster_masks, cpu);
114                 /* Matching cluster found. Link and update it. */
115                 if (cmsk && cmsk->clusterid == cluster)
116                         goto update;
117         }
118         cmsk = cluster_hotplug_mask;
119         cmsk->clusterid = cluster;
120         cluster_hotplug_mask = NULL;
121 update:
122         this_cpu_write(cluster_masks, cmsk);
123         cpumask_set_cpu(smp_processor_id(), &cmsk->mask);
124 }
125 
126 static int alloc_clustermask(unsigned int cpu, int node)
127 {
128         if (per_cpu(cluster_masks, cpu))
129                 return 0;
130         /*
131          * If a hotplug spare mask exists, check whether it's on the right
132          * node. If not, free it and allocate a new one.
133          */
134         if (cluster_hotplug_mask) {
135                 if (cluster_hotplug_mask->node == node)
136                         return 0;
137                 kfree(cluster_hotplug_mask);
138         }
139 
140         cluster_hotplug_mask = kzalloc_node(sizeof(*cluster_hotplug_mask),
141                                             GFP_KERNEL, node);
142         if (!cluster_hotplug_mask)
143                 return -ENOMEM;
144         cluster_hotplug_mask->node = node;
145         return 0;
146 }
147 
148 static int x2apic_prepare_cpu(unsigned int cpu)
149 {
150         if (alloc_clustermask(cpu, cpu_to_node(cpu)) < 0)
151                 return -ENOMEM;
152         if (!zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL))
153                 return -ENOMEM;
154         return 0;
155 }
156 
157 static int x2apic_dead_cpu(unsigned int dead_cpu)
158 {
159         struct cluster_mask *cmsk = per_cpu(cluster_masks, dead_cpu);
160 
161         cpumask_clear_cpu(dead_cpu, &cmsk->mask);
162         free_cpumask_var(per_cpu(ipi_mask, dead_cpu));
163         return 0;
164 }
165 
166 static int x2apic_cluster_probe(void)
167 {
168         if (!x2apic_mode)
169                 return 0;
170 
171         if (cpuhp_setup_state(CPUHP_X2APIC_PREPARE, "x86/x2apic:prepare",
172                               x2apic_prepare_cpu, x2apic_dead_cpu) < 0) {
173                 pr_err("Failed to register X2APIC_PREPARE\n");
174                 return 0;
175         }
176         init_x2apic_ldr();
177         return 1;
178 }
179 
180 static struct apic apic_x2apic_cluster __ro_after_init = {
181 
182         .name                           = "cluster x2apic",
183         .probe                          = x2apic_cluster_probe,
184         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
185         .apic_id_valid                  = x2apic_apic_id_valid,
186         .apic_id_registered             = x2apic_apic_id_registered,
187 
188         .irq_delivery_mode              = dest_Fixed,
189         .irq_dest_mode                  = 1, /* logical */
190 
191         .disable_esr                    = 0,
192         .dest_logical                   = APIC_DEST_LOGICAL,
193         .check_apicid_used              = NULL,
194 
195         .init_apic_ldr                  = init_x2apic_ldr,
196 
197         .ioapic_phys_id_map             = NULL,
198         .setup_apic_routing             = NULL,
199         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
200         .apicid_to_cpu_present          = NULL,
201         .check_phys_apicid_present      = default_check_phys_apicid_present,
202         .phys_pkg_id                    = x2apic_phys_pkg_id,
203 
204         .get_apic_id                    = x2apic_get_apic_id,
205         .set_apic_id                    = x2apic_set_apic_id,
206 
207         .calc_dest_apicid               = x2apic_calc_apicid,
208 
209         .send_IPI                       = x2apic_send_IPI,
210         .send_IPI_mask                  = x2apic_send_IPI_mask,
211         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
212         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
213         .send_IPI_all                   = x2apic_send_IPI_all,
214         .send_IPI_self                  = x2apic_send_IPI_self,
215 
216         .inquire_remote_apic            = NULL,
217 
218         .read                           = native_apic_msr_read,
219         .write                          = native_apic_msr_write,
220         .eoi_write                      = native_apic_msr_eoi_write,
221         .icr_read                       = native_x2apic_icr_read,
222         .icr_write                      = native_x2apic_icr_write,
223         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
224         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
225 };
226 
227 apic_driver(apic_x2apic_cluster);
228 

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