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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* ds.c: Domain Services driver for Logical Domains
0003  *
0004  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
0005  */
0006 
0007 #include <linux/kernel.h>
0008 #include <linux/module.h>
0009 #include <linux/types.h>
0010 #include <linux/string.h>
0011 #include <linux/slab.h>
0012 #include <linux/sched.h>
0013 #include <linux/sched/clock.h>
0014 #include <linux/delay.h>
0015 #include <linux/mutex.h>
0016 #include <linux/kthread.h>
0017 #include <linux/reboot.h>
0018 #include <linux/cpu.h>
0019 
0020 #include <asm/hypervisor.h>
0021 #include <asm/ldc.h>
0022 #include <asm/vio.h>
0023 #include <asm/mdesc.h>
0024 #include <asm/head.h>
0025 #include <asm/irq.h>
0026 
0027 #include "kernel.h"
0028 
0029 #define DRV_MODULE_NAME     "ds"
0030 #define PFX DRV_MODULE_NAME ": "
0031 #define DRV_MODULE_VERSION  "1.0"
0032 #define DRV_MODULE_RELDATE  "Jul 11, 2007"
0033 
0034 static char version[] =
0035     DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
0036 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
0037 MODULE_DESCRIPTION("Sun LDOM domain services driver");
0038 MODULE_LICENSE("GPL");
0039 MODULE_VERSION(DRV_MODULE_VERSION);
0040 
0041 struct ds_msg_tag {
0042     __u32           type;
0043 #define DS_INIT_REQ     0x00
0044 #define DS_INIT_ACK     0x01
0045 #define DS_INIT_NACK        0x02
0046 #define DS_REG_REQ      0x03
0047 #define DS_REG_ACK      0x04
0048 #define DS_REG_NACK     0x05
0049 #define DS_UNREG_REQ        0x06
0050 #define DS_UNREG_ACK        0x07
0051 #define DS_UNREG_NACK       0x08
0052 #define DS_DATA         0x09
0053 #define DS_NACK         0x0a
0054 
0055     __u32           len;
0056 };
0057 
0058 /* Result codes */
0059 #define DS_OK           0x00
0060 #define DS_REG_VER_NACK     0x01
0061 #define DS_REG_DUP      0x02
0062 #define DS_INV_HDL      0x03
0063 #define DS_TYPE_UNKNOWN     0x04
0064 
0065 struct ds_version {
0066     __u16           major;
0067     __u16           minor;
0068 };
0069 
0070 struct ds_ver_req {
0071     struct ds_msg_tag   tag;
0072     struct ds_version   ver;
0073 };
0074 
0075 struct ds_ver_ack {
0076     struct ds_msg_tag   tag;
0077     __u16           minor;
0078 };
0079 
0080 struct ds_ver_nack {
0081     struct ds_msg_tag   tag;
0082     __u16           major;
0083 };
0084 
0085 struct ds_reg_req {
0086     struct ds_msg_tag   tag;
0087     __u64           handle;
0088     __u16           major;
0089     __u16           minor;
0090     char            svc_id[];
0091 };
0092 
0093 struct ds_reg_ack {
0094     struct ds_msg_tag   tag;
0095     __u64           handle;
0096     __u16           minor;
0097 };
0098 
0099 struct ds_reg_nack {
0100     struct ds_msg_tag   tag;
0101     __u64           handle;
0102     __u16           major;
0103 };
0104 
0105 struct ds_unreg_req {
0106     struct ds_msg_tag   tag;
0107     __u64           handle;
0108 };
0109 
0110 struct ds_unreg_ack {
0111     struct ds_msg_tag   tag;
0112     __u64           handle;
0113 };
0114 
0115 struct ds_unreg_nack {
0116     struct ds_msg_tag   tag;
0117     __u64           handle;
0118 };
0119 
0120 struct ds_data {
0121     struct ds_msg_tag   tag;
0122     __u64           handle;
0123 };
0124 
0125 struct ds_data_nack {
0126     struct ds_msg_tag   tag;
0127     __u64           handle;
0128     __u64           result;
0129 };
0130 
0131 struct ds_info;
0132 struct ds_cap_state {
0133     __u64           handle;
0134 
0135     void            (*data)(struct ds_info *dp,
0136                     struct ds_cap_state *cp,
0137                     void *buf, int len);
0138 
0139     const char      *service_id;
0140 
0141     u8          state;
0142 #define CAP_STATE_UNKNOWN   0x00
0143 #define CAP_STATE_REG_SENT  0x01
0144 #define CAP_STATE_REGISTERED    0x02
0145 };
0146 
0147 static void md_update_data(struct ds_info *dp, struct ds_cap_state *cp,
0148                void *buf, int len);
0149 static void domain_shutdown_data(struct ds_info *dp,
0150                  struct ds_cap_state *cp,
0151                  void *buf, int len);
0152 static void domain_panic_data(struct ds_info *dp,
0153                   struct ds_cap_state *cp,
0154                   void *buf, int len);
0155 #ifdef CONFIG_HOTPLUG_CPU
0156 static void dr_cpu_data(struct ds_info *dp,
0157             struct ds_cap_state *cp,
0158             void *buf, int len);
0159 #endif
0160 static void ds_pri_data(struct ds_info *dp,
0161             struct ds_cap_state *cp,
0162             void *buf, int len);
0163 static void ds_var_data(struct ds_info *dp,
0164             struct ds_cap_state *cp,
0165             void *buf, int len);
0166 
0167 static struct ds_cap_state ds_states_template[] = {
0168     {
0169         .service_id = "md-update",
0170         .data       = md_update_data,
0171     },
0172     {
0173         .service_id = "domain-shutdown",
0174         .data       = domain_shutdown_data,
0175     },
0176     {
0177         .service_id = "domain-panic",
0178         .data       = domain_panic_data,
0179     },
0180 #ifdef CONFIG_HOTPLUG_CPU
0181     {
0182         .service_id = "dr-cpu",
0183         .data       = dr_cpu_data,
0184     },
0185 #endif
0186     {
0187         .service_id = "pri",
0188         .data       = ds_pri_data,
0189     },
0190     {
0191         .service_id = "var-config",
0192         .data       = ds_var_data,
0193     },
0194     {
0195         .service_id = "var-config-backup",
0196         .data       = ds_var_data,
0197     },
0198 };
0199 
0200 static DEFINE_SPINLOCK(ds_lock);
0201 
0202 struct ds_info {
0203     struct ldc_channel  *lp;
0204     u8          hs_state;
0205 #define DS_HS_START     0x01
0206 #define DS_HS_DONE      0x02
0207 
0208     u64         id;
0209 
0210     void            *rcv_buf;
0211     int         rcv_buf_len;
0212 
0213     struct ds_cap_state *ds_states;
0214     int         num_ds_states;
0215 
0216     struct ds_info      *next;
0217 };
0218 
0219 static struct ds_info *ds_info_list;
0220 
0221 static struct ds_cap_state *find_cap(struct ds_info *dp, u64 handle)
0222 {
0223     unsigned int index = handle >> 32;
0224 
0225     if (index >= dp->num_ds_states)
0226         return NULL;
0227     return &dp->ds_states[index];
0228 }
0229 
0230 static struct ds_cap_state *find_cap_by_string(struct ds_info *dp,
0231                            const char *name)
0232 {
0233     int i;
0234 
0235     for (i = 0; i < dp->num_ds_states; i++) {
0236         if (strcmp(dp->ds_states[i].service_id, name))
0237             continue;
0238 
0239         return &dp->ds_states[i];
0240     }
0241     return NULL;
0242 }
0243 
0244 static int __ds_send(struct ldc_channel *lp, void *data, int len)
0245 {
0246     int err, limit = 1000;
0247 
0248     err = -EINVAL;
0249     while (limit-- > 0) {
0250         err = ldc_write(lp, data, len);
0251         if (!err || (err != -EAGAIN))
0252             break;
0253         udelay(1);
0254     }
0255 
0256     return err;
0257 }
0258 
0259 static int ds_send(struct ldc_channel *lp, void *data, int len)
0260 {
0261     unsigned long flags;
0262     int err;
0263 
0264     spin_lock_irqsave(&ds_lock, flags);
0265     err = __ds_send(lp, data, len);
0266     spin_unlock_irqrestore(&ds_lock, flags);
0267 
0268     return err;
0269 }
0270 
0271 struct ds_md_update_req {
0272     __u64               req_num;
0273 };
0274 
0275 struct ds_md_update_res {
0276     __u64               req_num;
0277     __u32               result;
0278 };
0279 
0280 static void md_update_data(struct ds_info *dp,
0281                struct ds_cap_state *cp,
0282                void *buf, int len)
0283 {
0284     struct ldc_channel *lp = dp->lp;
0285     struct ds_data *dpkt = buf;
0286     struct ds_md_update_req *rp;
0287     struct {
0288         struct ds_data      data;
0289         struct ds_md_update_res res;
0290     } pkt;
0291 
0292     rp = (struct ds_md_update_req *) (dpkt + 1);
0293 
0294     printk(KERN_INFO "ds-%llu: Machine description update.\n", dp->id);
0295 
0296     mdesc_update();
0297 
0298     memset(&pkt, 0, sizeof(pkt));
0299     pkt.data.tag.type = DS_DATA;
0300     pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
0301     pkt.data.handle = cp->handle;
0302     pkt.res.req_num = rp->req_num;
0303     pkt.res.result = DS_OK;
0304 
0305     ds_send(lp, &pkt, sizeof(pkt));
0306 }
0307 
0308 struct ds_shutdown_req {
0309     __u64               req_num;
0310     __u32               ms_delay;
0311 };
0312 
0313 struct ds_shutdown_res {
0314     __u64               req_num;
0315     __u32               result;
0316     char                reason[1];
0317 };
0318 
0319 static void domain_shutdown_data(struct ds_info *dp,
0320                  struct ds_cap_state *cp,
0321                  void *buf, int len)
0322 {
0323     struct ldc_channel *lp = dp->lp;
0324     struct ds_data *dpkt = buf;
0325     struct ds_shutdown_req *rp;
0326     struct {
0327         struct ds_data      data;
0328         struct ds_shutdown_res  res;
0329     } pkt;
0330 
0331     rp = (struct ds_shutdown_req *) (dpkt + 1);
0332 
0333     printk(KERN_ALERT "ds-%llu: Shutdown request from "
0334            "LDOM manager received.\n", dp->id);
0335 
0336     memset(&pkt, 0, sizeof(pkt));
0337     pkt.data.tag.type = DS_DATA;
0338     pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
0339     pkt.data.handle = cp->handle;
0340     pkt.res.req_num = rp->req_num;
0341     pkt.res.result = DS_OK;
0342     pkt.res.reason[0] = 0;
0343 
0344     ds_send(lp, &pkt, sizeof(pkt));
0345 
0346     orderly_poweroff(true);
0347 }
0348 
0349 struct ds_panic_req {
0350     __u64               req_num;
0351 };
0352 
0353 struct ds_panic_res {
0354     __u64               req_num;
0355     __u32               result;
0356     char                reason[1];
0357 };
0358 
0359 static void domain_panic_data(struct ds_info *dp,
0360                   struct ds_cap_state *cp,
0361                   void *buf, int len)
0362 {
0363     struct ldc_channel *lp = dp->lp;
0364     struct ds_data *dpkt = buf;
0365     struct ds_panic_req *rp;
0366     struct {
0367         struct ds_data      data;
0368         struct ds_panic_res res;
0369     } pkt;
0370 
0371     rp = (struct ds_panic_req *) (dpkt + 1);
0372 
0373     printk(KERN_ALERT "ds-%llu: Panic request from "
0374            "LDOM manager received.\n", dp->id);
0375 
0376     memset(&pkt, 0, sizeof(pkt));
0377     pkt.data.tag.type = DS_DATA;
0378     pkt.data.tag.len = sizeof(pkt) - sizeof(struct ds_msg_tag);
0379     pkt.data.handle = cp->handle;
0380     pkt.res.req_num = rp->req_num;
0381     pkt.res.result = DS_OK;
0382     pkt.res.reason[0] = 0;
0383 
0384     ds_send(lp, &pkt, sizeof(pkt));
0385 
0386     panic("PANIC requested by LDOM manager.");
0387 }
0388 
0389 #ifdef CONFIG_HOTPLUG_CPU
0390 struct dr_cpu_tag {
0391     __u64               req_num;
0392     __u32               type;
0393 #define DR_CPU_CONFIGURE        0x43
0394 #define DR_CPU_UNCONFIGURE      0x55
0395 #define DR_CPU_FORCE_UNCONFIGURE    0x46
0396 #define DR_CPU_STATUS           0x53
0397 
0398 /* Responses */
0399 #define DR_CPU_OK           0x6f
0400 #define DR_CPU_ERROR            0x65
0401 
0402     __u32               num_records;
0403 };
0404 
0405 struct dr_cpu_resp_entry {
0406     __u32               cpu;
0407     __u32               result;
0408 #define DR_CPU_RES_OK           0x00
0409 #define DR_CPU_RES_FAILURE      0x01
0410 #define DR_CPU_RES_BLOCKED      0x02
0411 #define DR_CPU_RES_CPU_NOT_RESPONDING   0x03
0412 #define DR_CPU_RES_NOT_IN_MD        0x04
0413 
0414     __u32               stat;
0415 #define DR_CPU_STAT_NOT_PRESENT     0x00
0416 #define DR_CPU_STAT_UNCONFIGURED    0x01
0417 #define DR_CPU_STAT_CONFIGURED      0x02
0418 
0419     __u32               str_off;
0420 };
0421 
0422 static void __dr_cpu_send_error(struct ds_info *dp,
0423                 struct ds_cap_state *cp,
0424                 struct ds_data *data)
0425 {
0426     struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
0427     struct {
0428         struct ds_data      data;
0429         struct dr_cpu_tag   tag;
0430     } pkt;
0431     int msg_len;
0432 
0433     memset(&pkt, 0, sizeof(pkt));
0434     pkt.data.tag.type = DS_DATA;
0435     pkt.data.handle = cp->handle;
0436     pkt.tag.req_num = tag->req_num;
0437     pkt.tag.type = DR_CPU_ERROR;
0438     pkt.tag.num_records = 0;
0439 
0440     msg_len = (sizeof(struct ds_data) +
0441            sizeof(struct dr_cpu_tag));
0442 
0443     pkt.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
0444 
0445     __ds_send(dp->lp, &pkt, msg_len);
0446 }
0447 
0448 static void dr_cpu_send_error(struct ds_info *dp,
0449                   struct ds_cap_state *cp,
0450                   struct ds_data *data)
0451 {
0452     unsigned long flags;
0453 
0454     spin_lock_irqsave(&ds_lock, flags);
0455     __dr_cpu_send_error(dp, cp, data);
0456     spin_unlock_irqrestore(&ds_lock, flags);
0457 }
0458 
0459 #define CPU_SENTINEL    0xffffffff
0460 
0461 static void purge_dups(u32 *list, u32 num_ents)
0462 {
0463     unsigned int i;
0464 
0465     for (i = 0; i < num_ents; i++) {
0466         u32 cpu = list[i];
0467         unsigned int j;
0468 
0469         if (cpu == CPU_SENTINEL)
0470             continue;
0471 
0472         for (j = i + 1; j < num_ents; j++) {
0473             if (list[j] == cpu)
0474                 list[j] = CPU_SENTINEL;
0475         }
0476     }
0477 }
0478 
0479 static int dr_cpu_size_response(int ncpus)
0480 {
0481     return (sizeof(struct ds_data) +
0482         sizeof(struct dr_cpu_tag) +
0483         (sizeof(struct dr_cpu_resp_entry) * ncpus));
0484 }
0485 
0486 static void dr_cpu_init_response(struct ds_data *resp, u64 req_num,
0487                  u64 handle, int resp_len, int ncpus,
0488                  cpumask_t *mask, u32 default_stat)
0489 {
0490     struct dr_cpu_resp_entry *ent;
0491     struct dr_cpu_tag *tag;
0492     int i, cpu;
0493 
0494     tag = (struct dr_cpu_tag *) (resp + 1);
0495     ent = (struct dr_cpu_resp_entry *) (tag + 1);
0496 
0497     resp->tag.type = DS_DATA;
0498     resp->tag.len = resp_len - sizeof(struct ds_msg_tag);
0499     resp->handle = handle;
0500     tag->req_num = req_num;
0501     tag->type = DR_CPU_OK;
0502     tag->num_records = ncpus;
0503 
0504     i = 0;
0505     for_each_cpu(cpu, mask) {
0506         ent[i].cpu = cpu;
0507         ent[i].result = DR_CPU_RES_OK;
0508         ent[i].stat = default_stat;
0509         i++;
0510     }
0511     BUG_ON(i != ncpus);
0512 }
0513 
0514 static void dr_cpu_mark(struct ds_data *resp, int cpu, int ncpus,
0515             u32 res, u32 stat)
0516 {
0517     struct dr_cpu_resp_entry *ent;
0518     struct dr_cpu_tag *tag;
0519     int i;
0520 
0521     tag = (struct dr_cpu_tag *) (resp + 1);
0522     ent = (struct dr_cpu_resp_entry *) (tag + 1);
0523 
0524     for (i = 0; i < ncpus; i++) {
0525         if (ent[i].cpu != cpu)
0526             continue;
0527         ent[i].result = res;
0528         ent[i].stat = stat;
0529         break;
0530     }
0531 }
0532 
0533 static int dr_cpu_configure(struct ds_info *dp, struct ds_cap_state *cp,
0534                 u64 req_num, cpumask_t *mask)
0535 {
0536     struct ds_data *resp;
0537     int resp_len, ncpus, cpu;
0538     unsigned long flags;
0539 
0540     ncpus = cpumask_weight(mask);
0541     resp_len = dr_cpu_size_response(ncpus);
0542     resp = kzalloc(resp_len, GFP_KERNEL);
0543     if (!resp)
0544         return -ENOMEM;
0545 
0546     dr_cpu_init_response(resp, req_num, cp->handle,
0547                  resp_len, ncpus, mask,
0548                  DR_CPU_STAT_CONFIGURED);
0549 
0550     mdesc_populate_present_mask(mask);
0551     mdesc_fill_in_cpu_data(mask);
0552 
0553     for_each_cpu(cpu, mask) {
0554         int err;
0555 
0556         printk(KERN_INFO "ds-%llu: Starting cpu %d...\n",
0557                dp->id, cpu);
0558         err = add_cpu(cpu);
0559         if (err) {
0560             __u32 res = DR_CPU_RES_FAILURE;
0561             __u32 stat = DR_CPU_STAT_UNCONFIGURED;
0562 
0563             if (!cpu_present(cpu)) {
0564                 /* CPU not present in MD */
0565                 res = DR_CPU_RES_NOT_IN_MD;
0566                 stat = DR_CPU_STAT_NOT_PRESENT;
0567             } else if (err == -ENODEV) {
0568                 /* CPU did not call in successfully */
0569                 res = DR_CPU_RES_CPU_NOT_RESPONDING;
0570             }
0571 
0572             printk(KERN_INFO "ds-%llu: CPU startup failed err=%d\n",
0573                    dp->id, err);
0574             dr_cpu_mark(resp, cpu, ncpus, res, stat);
0575         }
0576     }
0577 
0578     spin_lock_irqsave(&ds_lock, flags);
0579     __ds_send(dp->lp, resp, resp_len);
0580     spin_unlock_irqrestore(&ds_lock, flags);
0581 
0582     kfree(resp);
0583 
0584     /* Redistribute IRQs, taking into account the new cpus.  */
0585     fixup_irqs();
0586 
0587     return 0;
0588 }
0589 
0590 static int dr_cpu_unconfigure(struct ds_info *dp,
0591                   struct ds_cap_state *cp,
0592                   u64 req_num,
0593                   cpumask_t *mask)
0594 {
0595     struct ds_data *resp;
0596     int resp_len, ncpus, cpu;
0597     unsigned long flags;
0598 
0599     ncpus = cpumask_weight(mask);
0600     resp_len = dr_cpu_size_response(ncpus);
0601     resp = kzalloc(resp_len, GFP_KERNEL);
0602     if (!resp)
0603         return -ENOMEM;
0604 
0605     dr_cpu_init_response(resp, req_num, cp->handle,
0606                  resp_len, ncpus, mask,
0607                  DR_CPU_STAT_UNCONFIGURED);
0608 
0609     for_each_cpu(cpu, mask) {
0610         int err;
0611 
0612         printk(KERN_INFO "ds-%llu: Shutting down cpu %d...\n",
0613                dp->id, cpu);
0614         err = remove_cpu(cpu);
0615         if (err)
0616             dr_cpu_mark(resp, cpu, ncpus,
0617                     DR_CPU_RES_FAILURE,
0618                     DR_CPU_STAT_CONFIGURED);
0619     }
0620 
0621     spin_lock_irqsave(&ds_lock, flags);
0622     __ds_send(dp->lp, resp, resp_len);
0623     spin_unlock_irqrestore(&ds_lock, flags);
0624 
0625     kfree(resp);
0626 
0627     return 0;
0628 }
0629 
0630 static void dr_cpu_data(struct ds_info *dp, struct ds_cap_state *cp, void *buf,
0631             int len)
0632 {
0633     struct ds_data *data = buf;
0634     struct dr_cpu_tag *tag = (struct dr_cpu_tag *) (data + 1);
0635     u32 *cpu_list = (u32 *) (tag + 1);
0636     u64 req_num = tag->req_num;
0637     cpumask_t mask;
0638     unsigned int i;
0639     int err;
0640 
0641     switch (tag->type) {
0642     case DR_CPU_CONFIGURE:
0643     case DR_CPU_UNCONFIGURE:
0644     case DR_CPU_FORCE_UNCONFIGURE:
0645         break;
0646 
0647     default:
0648         dr_cpu_send_error(dp, cp, data);
0649         return;
0650     }
0651 
0652     purge_dups(cpu_list, tag->num_records);
0653 
0654     cpumask_clear(&mask);
0655     for (i = 0; i < tag->num_records; i++) {
0656         if (cpu_list[i] == CPU_SENTINEL)
0657             continue;
0658 
0659         if (cpu_list[i] < nr_cpu_ids)
0660             cpumask_set_cpu(cpu_list[i], &mask);
0661     }
0662 
0663     if (tag->type == DR_CPU_CONFIGURE)
0664         err = dr_cpu_configure(dp, cp, req_num, &mask);
0665     else
0666         err = dr_cpu_unconfigure(dp, cp, req_num, &mask);
0667 
0668     if (err)
0669         dr_cpu_send_error(dp, cp, data);
0670 }
0671 #endif /* CONFIG_HOTPLUG_CPU */
0672 
0673 struct ds_pri_msg {
0674     __u64               req_num;
0675     __u64               type;
0676 #define DS_PRI_REQUEST          0x00
0677 #define DS_PRI_DATA         0x01
0678 #define DS_PRI_UPDATE           0x02
0679 };
0680 
0681 static void ds_pri_data(struct ds_info *dp,
0682             struct ds_cap_state *cp,
0683             void *buf, int len)
0684 {
0685     struct ds_data *dpkt = buf;
0686     struct ds_pri_msg *rp;
0687 
0688     rp = (struct ds_pri_msg *) (dpkt + 1);
0689 
0690     printk(KERN_INFO "ds-%llu: PRI REQ [%llx:%llx], len=%d\n",
0691            dp->id, rp->req_num, rp->type, len);
0692 }
0693 
0694 struct ds_var_hdr {
0695     __u32               type;
0696 #define DS_VAR_SET_REQ          0x00
0697 #define DS_VAR_DELETE_REQ       0x01
0698 #define DS_VAR_SET_RESP         0x02
0699 #define DS_VAR_DELETE_RESP      0x03
0700 };
0701 
0702 struct ds_var_set_msg {
0703     struct ds_var_hdr       hdr;
0704     char                name_and_value[];
0705 };
0706 
0707 struct ds_var_delete_msg {
0708     struct ds_var_hdr       hdr;
0709     char                name[];
0710 };
0711 
0712 struct ds_var_resp {
0713     struct ds_var_hdr       hdr;
0714     __u32               result;
0715 #define DS_VAR_SUCCESS          0x00
0716 #define DS_VAR_NO_SPACE         0x01
0717 #define DS_VAR_INVALID_VAR      0x02
0718 #define DS_VAR_INVALID_VAL      0x03
0719 #define DS_VAR_NOT_PRESENT      0x04
0720 };
0721 
0722 static DEFINE_MUTEX(ds_var_mutex);
0723 static int ds_var_doorbell;
0724 static int ds_var_response;
0725 
0726 static void ds_var_data(struct ds_info *dp,
0727             struct ds_cap_state *cp,
0728             void *buf, int len)
0729 {
0730     struct ds_data *dpkt = buf;
0731     struct ds_var_resp *rp;
0732 
0733     rp = (struct ds_var_resp *) (dpkt + 1);
0734 
0735     if (rp->hdr.type != DS_VAR_SET_RESP &&
0736         rp->hdr.type != DS_VAR_DELETE_RESP)
0737         return;
0738 
0739     ds_var_response = rp->result;
0740     wmb();
0741     ds_var_doorbell = 1;
0742 }
0743 
0744 void ldom_set_var(const char *var, const char *value)
0745 {
0746     struct ds_cap_state *cp;
0747     struct ds_info *dp;
0748     unsigned long flags;
0749 
0750     spin_lock_irqsave(&ds_lock, flags);
0751     cp = NULL;
0752     for (dp = ds_info_list; dp; dp = dp->next) {
0753         struct ds_cap_state *tmp;
0754 
0755         tmp = find_cap_by_string(dp, "var-config");
0756         if (tmp && tmp->state == CAP_STATE_REGISTERED) {
0757             cp = tmp;
0758             break;
0759         }
0760     }
0761     if (!cp) {
0762         for (dp = ds_info_list; dp; dp = dp->next) {
0763             struct ds_cap_state *tmp;
0764 
0765             tmp = find_cap_by_string(dp, "var-config-backup");
0766             if (tmp && tmp->state == CAP_STATE_REGISTERED) {
0767                 cp = tmp;
0768                 break;
0769             }
0770         }
0771     }
0772     spin_unlock_irqrestore(&ds_lock, flags);
0773 
0774     if (cp) {
0775         union {
0776             struct {
0777                 struct ds_data      data;
0778                 struct ds_var_set_msg   msg;
0779             } header;
0780             char            all[512];
0781         } pkt;
0782         char  *base, *p;
0783         int msg_len, loops;
0784 
0785         if (strlen(var) + strlen(value) + 2 >
0786             sizeof(pkt) - sizeof(pkt.header)) {
0787             printk(KERN_ERR PFX
0788                 "contents length: %zu, which more than max: %lu,"
0789                 "so could not set (%s) variable to (%s).\n",
0790                 strlen(var) + strlen(value) + 2,
0791                 sizeof(pkt) - sizeof(pkt.header), var, value);
0792             return;
0793         }
0794 
0795         memset(&pkt, 0, sizeof(pkt));
0796         pkt.header.data.tag.type = DS_DATA;
0797         pkt.header.data.handle = cp->handle;
0798         pkt.header.msg.hdr.type = DS_VAR_SET_REQ;
0799         base = p = &pkt.header.msg.name_and_value[0];
0800         strcpy(p, var);
0801         p += strlen(var) + 1;
0802         strcpy(p, value);
0803         p += strlen(value) + 1;
0804 
0805         msg_len = (sizeof(struct ds_data) +
0806                sizeof(struct ds_var_set_msg) +
0807                (p - base));
0808         msg_len = (msg_len + 3) & ~3;
0809         pkt.header.data.tag.len = msg_len - sizeof(struct ds_msg_tag);
0810 
0811         mutex_lock(&ds_var_mutex);
0812 
0813         spin_lock_irqsave(&ds_lock, flags);
0814         ds_var_doorbell = 0;
0815         ds_var_response = -1;
0816 
0817         __ds_send(dp->lp, &pkt, msg_len);
0818         spin_unlock_irqrestore(&ds_lock, flags);
0819 
0820         loops = 1000;
0821         while (ds_var_doorbell == 0) {
0822             if (loops-- < 0)
0823                 break;
0824             barrier();
0825             udelay(100);
0826         }
0827 
0828         mutex_unlock(&ds_var_mutex);
0829 
0830         if (ds_var_doorbell == 0 ||
0831             ds_var_response != DS_VAR_SUCCESS)
0832             printk(KERN_ERR "ds-%llu: var-config [%s:%s] "
0833                    "failed, response(%d).\n",
0834                    dp->id, var, value,
0835                    ds_var_response);
0836     } else {
0837         printk(KERN_ERR PFX "var-config not registered so "
0838                "could not set (%s) variable to (%s).\n",
0839                var, value);
0840     }
0841 }
0842 
0843 static char full_boot_str[256] __attribute__((aligned(32)));
0844 static int reboot_data_supported;
0845 
0846 void ldom_reboot(const char *boot_command)
0847 {
0848     /* Don't bother with any of this if the boot_command
0849      * is empty.
0850      */
0851     if (boot_command && strlen(boot_command)) {
0852         unsigned long len;
0853 
0854         snprintf(full_boot_str, sizeof(full_boot_str), "boot %s",
0855              boot_command);
0856         len = strlen(full_boot_str);
0857 
0858         if (reboot_data_supported) {
0859             unsigned long ra = kimage_addr_to_ra(full_boot_str);
0860             unsigned long hv_ret;
0861 
0862             hv_ret = sun4v_reboot_data_set(ra, len);
0863             if (hv_ret != HV_EOK)
0864                 pr_err("SUN4V: Unable to set reboot data "
0865                        "hv_ret=%lu\n", hv_ret);
0866         } else {
0867             ldom_set_var("reboot-command", full_boot_str);
0868         }
0869     }
0870     sun4v_mach_sir();
0871 }
0872 
0873 void ldom_power_off(void)
0874 {
0875     sun4v_mach_exit(0);
0876 }
0877 
0878 static void ds_conn_reset(struct ds_info *dp)
0879 {
0880     printk(KERN_ERR "ds-%llu: ds_conn_reset() from %ps\n",
0881            dp->id, __builtin_return_address(0));
0882 }
0883 
0884 static int register_services(struct ds_info *dp)
0885 {
0886     struct ldc_channel *lp = dp->lp;
0887     int i;
0888 
0889     for (i = 0; i < dp->num_ds_states; i++) {
0890         struct {
0891             struct ds_reg_req req;
0892             u8 id_buf[256];
0893         } pbuf;
0894         struct ds_cap_state *cp = &dp->ds_states[i];
0895         int err, msg_len;
0896         u64 new_count;
0897 
0898         if (cp->state == CAP_STATE_REGISTERED)
0899             continue;
0900 
0901         new_count = sched_clock() & 0xffffffff;
0902         cp->handle = ((u64) i << 32) | new_count;
0903 
0904         msg_len = (sizeof(struct ds_reg_req) +
0905                strlen(cp->service_id));
0906 
0907         memset(&pbuf, 0, sizeof(pbuf));
0908         pbuf.req.tag.type = DS_REG_REQ;
0909         pbuf.req.tag.len = (msg_len - sizeof(struct ds_msg_tag));
0910         pbuf.req.handle = cp->handle;
0911         pbuf.req.major = 1;
0912         pbuf.req.minor = 0;
0913         strcpy(pbuf.id_buf, cp->service_id);
0914 
0915         err = __ds_send(lp, &pbuf, msg_len);
0916         if (err > 0)
0917             cp->state = CAP_STATE_REG_SENT;
0918     }
0919     return 0;
0920 }
0921 
0922 static int ds_handshake(struct ds_info *dp, struct ds_msg_tag *pkt)
0923 {
0924 
0925     if (dp->hs_state == DS_HS_START) {
0926         if (pkt->type != DS_INIT_ACK)
0927             goto conn_reset;
0928 
0929         dp->hs_state = DS_HS_DONE;
0930 
0931         return register_services(dp);
0932     }
0933 
0934     if (dp->hs_state != DS_HS_DONE)
0935         goto conn_reset;
0936 
0937     if (pkt->type == DS_REG_ACK) {
0938         struct ds_reg_ack *ap = (struct ds_reg_ack *) pkt;
0939         struct ds_cap_state *cp = find_cap(dp, ap->handle);
0940 
0941         if (!cp) {
0942             printk(KERN_ERR "ds-%llu: REG ACK for unknown "
0943                    "handle %llx\n", dp->id, ap->handle);
0944             return 0;
0945         }
0946         printk(KERN_INFO "ds-%llu: Registered %s service.\n",
0947                dp->id, cp->service_id);
0948         cp->state = CAP_STATE_REGISTERED;
0949     } else if (pkt->type == DS_REG_NACK) {
0950         struct ds_reg_nack *np = (struct ds_reg_nack *) pkt;
0951         struct ds_cap_state *cp = find_cap(dp, np->handle);
0952 
0953         if (!cp) {
0954             printk(KERN_ERR "ds-%llu: REG NACK for "
0955                    "unknown handle %llx\n",
0956                    dp->id, np->handle);
0957             return 0;
0958         }
0959         cp->state = CAP_STATE_UNKNOWN;
0960     }
0961 
0962     return 0;
0963 
0964 conn_reset:
0965     ds_conn_reset(dp);
0966     return -ECONNRESET;
0967 }
0968 
0969 static void __send_ds_nack(struct ds_info *dp, u64 handle)
0970 {
0971     struct ds_data_nack nack = {
0972         .tag = {
0973             .type = DS_NACK,
0974             .len = (sizeof(struct ds_data_nack) -
0975                 sizeof(struct ds_msg_tag)),
0976         },
0977         .handle = handle,
0978         .result = DS_INV_HDL,
0979     };
0980 
0981     __ds_send(dp->lp, &nack, sizeof(nack));
0982 }
0983 
0984 static LIST_HEAD(ds_work_list);
0985 static DECLARE_WAIT_QUEUE_HEAD(ds_wait);
0986 
0987 struct ds_queue_entry {
0988     struct list_head        list;
0989     struct ds_info          *dp;
0990     int             req_len;
0991     int             __pad;
0992     u64             req[];
0993 };
0994 
0995 static void process_ds_work(void)
0996 {
0997     struct ds_queue_entry *qp, *tmp;
0998     unsigned long flags;
0999     LIST_HEAD(todo);
1000 
1001     spin_lock_irqsave(&ds_lock, flags);
1002     list_splice_init(&ds_work_list, &todo);
1003     spin_unlock_irqrestore(&ds_lock, flags);
1004 
1005     list_for_each_entry_safe(qp, tmp, &todo, list) {
1006         struct ds_data *dpkt = (struct ds_data *) qp->req;
1007         struct ds_info *dp = qp->dp;
1008         struct ds_cap_state *cp = find_cap(dp, dpkt->handle);
1009         int req_len = qp->req_len;
1010 
1011         if (!cp) {
1012             printk(KERN_ERR "ds-%llu: Data for unknown "
1013                    "handle %llu\n",
1014                    dp->id, dpkt->handle);
1015 
1016             spin_lock_irqsave(&ds_lock, flags);
1017             __send_ds_nack(dp, dpkt->handle);
1018             spin_unlock_irqrestore(&ds_lock, flags);
1019         } else {
1020             cp->data(dp, cp, dpkt, req_len);
1021         }
1022 
1023         list_del(&qp->list);
1024         kfree(qp);
1025     }
1026 }
1027 
1028 static int ds_thread(void *__unused)
1029 {
1030     DEFINE_WAIT(wait);
1031 
1032     while (1) {
1033         prepare_to_wait(&ds_wait, &wait, TASK_INTERRUPTIBLE);
1034         if (list_empty(&ds_work_list))
1035             schedule();
1036         finish_wait(&ds_wait, &wait);
1037 
1038         if (kthread_should_stop())
1039             break;
1040 
1041         process_ds_work();
1042     }
1043 
1044     return 0;
1045 }
1046 
1047 static int ds_data(struct ds_info *dp, struct ds_msg_tag *pkt, int len)
1048 {
1049     struct ds_data *dpkt = (struct ds_data *) pkt;
1050     struct ds_queue_entry *qp;
1051 
1052     qp = kmalloc(sizeof(struct ds_queue_entry) + len, GFP_ATOMIC);
1053     if (!qp) {
1054         __send_ds_nack(dp, dpkt->handle);
1055     } else {
1056         qp->dp = dp;
1057         memcpy(&qp->req, pkt, len);
1058         list_add_tail(&qp->list, &ds_work_list);
1059         wake_up(&ds_wait);
1060     }
1061     return 0;
1062 }
1063 
1064 static void ds_up(struct ds_info *dp)
1065 {
1066     struct ldc_channel *lp = dp->lp;
1067     struct ds_ver_req req;
1068     int err;
1069 
1070     req.tag.type = DS_INIT_REQ;
1071     req.tag.len = sizeof(req) - sizeof(struct ds_msg_tag);
1072     req.ver.major = 1;
1073     req.ver.minor = 0;
1074 
1075     err = __ds_send(lp, &req, sizeof(req));
1076     if (err > 0)
1077         dp->hs_state = DS_HS_START;
1078 }
1079 
1080 static void ds_reset(struct ds_info *dp)
1081 {
1082     int i;
1083 
1084     dp->hs_state = 0;
1085 
1086     for (i = 0; i < dp->num_ds_states; i++) {
1087         struct ds_cap_state *cp = &dp->ds_states[i];
1088 
1089         cp->state = CAP_STATE_UNKNOWN;
1090     }
1091 }
1092 
1093 static void ds_event(void *arg, int event)
1094 {
1095     struct ds_info *dp = arg;
1096     struct ldc_channel *lp = dp->lp;
1097     unsigned long flags;
1098     int err;
1099 
1100     spin_lock_irqsave(&ds_lock, flags);
1101 
1102     if (event == LDC_EVENT_UP) {
1103         ds_up(dp);
1104         spin_unlock_irqrestore(&ds_lock, flags);
1105         return;
1106     }
1107 
1108     if (event == LDC_EVENT_RESET) {
1109         ds_reset(dp);
1110         spin_unlock_irqrestore(&ds_lock, flags);
1111         return;
1112     }
1113 
1114     if (event != LDC_EVENT_DATA_READY) {
1115         printk(KERN_WARNING "ds-%llu: Unexpected LDC event %d\n",
1116                dp->id, event);
1117         spin_unlock_irqrestore(&ds_lock, flags);
1118         return;
1119     }
1120 
1121     err = 0;
1122     while (1) {
1123         struct ds_msg_tag *tag;
1124 
1125         err = ldc_read(lp, dp->rcv_buf, sizeof(*tag));
1126 
1127         if (unlikely(err < 0)) {
1128             if (err == -ECONNRESET)
1129                 ds_conn_reset(dp);
1130             break;
1131         }
1132         if (err == 0)
1133             break;
1134 
1135         tag = dp->rcv_buf;
1136         err = ldc_read(lp, tag + 1, tag->len);
1137 
1138         if (unlikely(err < 0)) {
1139             if (err == -ECONNRESET)
1140                 ds_conn_reset(dp);
1141             break;
1142         }
1143         if (err < tag->len)
1144             break;
1145 
1146         if (tag->type < DS_DATA)
1147             err = ds_handshake(dp, dp->rcv_buf);
1148         else
1149             err = ds_data(dp, dp->rcv_buf,
1150                       sizeof(*tag) + err);
1151         if (err == -ECONNRESET)
1152             break;
1153     }
1154 
1155     spin_unlock_irqrestore(&ds_lock, flags);
1156 }
1157 
1158 static int ds_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1159 {
1160     static int ds_version_printed;
1161     struct ldc_channel_config ds_cfg = {
1162         .event      = ds_event,
1163         .mtu        = 4096,
1164         .mode       = LDC_MODE_STREAM,
1165     };
1166     struct mdesc_handle *hp;
1167     struct ldc_channel *lp;
1168     struct ds_info *dp;
1169     const u64 *val;
1170     int err, i;
1171 
1172     if (ds_version_printed++ == 0)
1173         printk(KERN_INFO "%s", version);
1174 
1175     dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1176     err = -ENOMEM;
1177     if (!dp)
1178         goto out_err;
1179 
1180     hp = mdesc_grab();
1181     val = mdesc_get_property(hp, vdev->mp, "id", NULL);
1182     if (val)
1183         dp->id = *val;
1184     mdesc_release(hp);
1185 
1186     dp->rcv_buf = kzalloc(4096, GFP_KERNEL);
1187     if (!dp->rcv_buf)
1188         goto out_free_dp;
1189 
1190     dp->rcv_buf_len = 4096;
1191 
1192     dp->ds_states = kmemdup(ds_states_template,
1193                 sizeof(ds_states_template), GFP_KERNEL);
1194     if (!dp->ds_states)
1195         goto out_free_rcv_buf;
1196 
1197     dp->num_ds_states = ARRAY_SIZE(ds_states_template);
1198 
1199     for (i = 0; i < dp->num_ds_states; i++)
1200         dp->ds_states[i].handle = ((u64)i << 32);
1201 
1202     ds_cfg.tx_irq = vdev->tx_irq;
1203     ds_cfg.rx_irq = vdev->rx_irq;
1204 
1205     lp = ldc_alloc(vdev->channel_id, &ds_cfg, dp, "DS");
1206     if (IS_ERR(lp)) {
1207         err = PTR_ERR(lp);
1208         goto out_free_ds_states;
1209     }
1210     dp->lp = lp;
1211 
1212     err = ldc_bind(lp);
1213     if (err)
1214         goto out_free_ldc;
1215 
1216     spin_lock_irq(&ds_lock);
1217     dp->next = ds_info_list;
1218     ds_info_list = dp;
1219     spin_unlock_irq(&ds_lock);
1220 
1221     return err;
1222 
1223 out_free_ldc:
1224     ldc_free(dp->lp);
1225 
1226 out_free_ds_states:
1227     kfree(dp->ds_states);
1228 
1229 out_free_rcv_buf:
1230     kfree(dp->rcv_buf);
1231 
1232 out_free_dp:
1233     kfree(dp);
1234 
1235 out_err:
1236     return err;
1237 }
1238 
1239 static const struct vio_device_id ds_match[] = {
1240     {
1241         .type = "domain-services-port",
1242     },
1243     {},
1244 };
1245 
1246 static struct vio_driver ds_driver = {
1247     .id_table   = ds_match,
1248     .probe      = ds_probe,
1249     .name       = "ds",
1250 };
1251 
1252 static int __init ds_init(void)
1253 {
1254     unsigned long hv_ret, major, minor;
1255 
1256     if (tlb_type == hypervisor) {
1257         hv_ret = sun4v_get_version(HV_GRP_REBOOT_DATA, &major, &minor);
1258         if (hv_ret == HV_EOK) {
1259             pr_info("SUN4V: Reboot data supported (maj=%lu,min=%lu).\n",
1260                 major, minor);
1261             reboot_data_supported = 1;
1262         }
1263     }
1264     kthread_run(ds_thread, NULL, "kldomd");
1265 
1266     return vio_register_driver(&ds_driver);
1267 }
1268 
1269 fs_initcall(ds_init);
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