| /* |
| * Copyright IBM Corp. 2007, 2009 |
| * |
| * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
| * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> |
| */ |
| |
| #define KMSG_COMPONENT "sclp_cmd" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/completion.h> |
| #include <linux/init.h> |
| #include <linux/errno.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/mm.h> |
| #include <linux/mmzone.h> |
| #include <linux/memory.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <asm/ctl_reg.h> |
| #include <asm/chpid.h> |
| #include <asm/setup.h> |
| #include <asm/page.h> |
| #include <asm/sclp.h> |
| |
| #include "sclp.h" |
| |
| #define SCLP_CMDW_READ_SCP_INFO 0x00020001 |
| #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 |
| |
| struct read_info_sccb { |
| struct sccb_header header; /* 0-7 */ |
| u16 rnmax; /* 8-9 */ |
| u8 rnsize; /* 10 */ |
| u8 _reserved0[24 - 11]; /* 11-15 */ |
| u8 loadparm[8]; /* 24-31 */ |
| u8 _reserved1[48 - 32]; /* 32-47 */ |
| u64 facilities; /* 48-55 */ |
| u8 _reserved2[84 - 56]; /* 56-83 */ |
| u8 fac84; /* 84 */ |
| u8 fac85; /* 85 */ |
| u8 _reserved3[91 - 86]; /* 86-90 */ |
| u8 flags; /* 91 */ |
| u8 _reserved4[100 - 92]; /* 92-99 */ |
| u32 rnsize2; /* 100-103 */ |
| u64 rnmax2; /* 104-111 */ |
| u8 _reserved5[4096 - 112]; /* 112-4095 */ |
| } __attribute__((packed, aligned(PAGE_SIZE))); |
| |
| static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE); |
| static struct read_info_sccb __initdata early_read_info_sccb; |
| static int __initdata early_read_info_sccb_valid; |
| |
| u64 sclp_facilities; |
| static u8 sclp_fac84; |
| static u8 sclp_fac85; |
| static unsigned long long rzm; |
| static unsigned long long rnmax; |
| |
| static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) |
| { |
| int rc; |
| |
| __ctl_set_bit(0, 9); |
| rc = sclp_service_call(cmd, sccb); |
| if (rc) |
| goto out; |
| __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | |
| PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); |
| local_irq_disable(); |
| out: |
| /* Contents of the sccb might have changed. */ |
| barrier(); |
| __ctl_clear_bit(0, 9); |
| return rc; |
| } |
| |
| static void __init sclp_read_info_early(void) |
| { |
| int rc; |
| int i; |
| struct read_info_sccb *sccb; |
| sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, |
| SCLP_CMDW_READ_SCP_INFO}; |
| |
| sccb = &early_read_info_sccb; |
| for (i = 0; i < ARRAY_SIZE(commands); i++) { |
| do { |
| memset(sccb, 0, sizeof(*sccb)); |
| sccb->header.length = sizeof(*sccb); |
| sccb->header.function_code = 0x80; |
| sccb->header.control_mask[2] = 0x80; |
| rc = sclp_cmd_sync_early(commands[i], sccb); |
| } while (rc == -EBUSY); |
| |
| if (rc) |
| break; |
| if (sccb->header.response_code == 0x10) { |
| early_read_info_sccb_valid = 1; |
| break; |
| } |
| if (sccb->header.response_code != 0x1f0) |
| break; |
| } |
| } |
| |
| static void __init sclp_event_mask_early(void) |
| { |
| struct init_sccb *sccb = &early_event_mask_sccb; |
| int rc; |
| |
| do { |
| memset(sccb, 0, sizeof(*sccb)); |
| sccb->header.length = sizeof(*sccb); |
| sccb->mask_length = sizeof(sccb_mask_t); |
| rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); |
| } while (rc == -EBUSY); |
| } |
| |
| void __init sclp_facilities_detect(void) |
| { |
| struct read_info_sccb *sccb; |
| |
| sclp_read_info_early(); |
| if (!early_read_info_sccb_valid) |
| return; |
| |
| sccb = &early_read_info_sccb; |
| sclp_facilities = sccb->facilities; |
| sclp_fac84 = sccb->fac84; |
| sclp_fac85 = sccb->fac85; |
| rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
| rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; |
| rzm <<= 20; |
| |
| sclp_event_mask_early(); |
| } |
| |
| bool __init sclp_has_linemode(void) |
| { |
| struct init_sccb *sccb = &early_event_mask_sccb; |
| |
| if (sccb->header.response_code != 0x20) |
| return 0; |
| if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)) |
| return 1; |
| return 0; |
| } |
| |
| bool __init sclp_has_vt220(void) |
| { |
| struct init_sccb *sccb = &early_event_mask_sccb; |
| |
| if (sccb->header.response_code != 0x20) |
| return 0; |
| if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) |
| return 1; |
| return 0; |
| } |
| |
| unsigned long long sclp_get_rnmax(void) |
| { |
| return rnmax; |
| } |
| |
| unsigned long long sclp_get_rzm(void) |
| { |
| return rzm; |
| } |
| |
| u8 sclp_get_fac85(void) |
| { |
| return sclp_fac85; |
| } |
| EXPORT_SYMBOL_GPL(sclp_get_fac85); |
| |
| /* |
| * This function will be called after sclp_facilities_detect(), which gets |
| * called from early.c code. Therefore the sccb should have valid contents. |
| */ |
| void __init sclp_get_ipl_info(struct sclp_ipl_info *info) |
| { |
| struct read_info_sccb *sccb; |
| |
| if (!early_read_info_sccb_valid) |
| return; |
| sccb = &early_read_info_sccb; |
| info->is_valid = 1; |
| if (sccb->flags & 0x2) |
| info->has_dump = 1; |
| memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); |
| } |
| |
| static void sclp_sync_callback(struct sclp_req *req, void *data) |
| { |
| struct completion *completion = data; |
| |
| complete(completion); |
| } |
| |
| static int do_sync_request(sclp_cmdw_t cmd, void *sccb) |
| { |
| struct completion completion; |
| struct sclp_req *request; |
| int rc; |
| |
| request = kzalloc(sizeof(*request), GFP_KERNEL); |
| if (!request) |
| return -ENOMEM; |
| request->command = cmd; |
| request->sccb = sccb; |
| request->status = SCLP_REQ_FILLED; |
| request->callback = sclp_sync_callback; |
| request->callback_data = &completion; |
| init_completion(&completion); |
| |
| /* Perform sclp request. */ |
| rc = sclp_add_request(request); |
| if (rc) |
| goto out; |
| wait_for_completion(&completion); |
| |
| /* Check response. */ |
| if (request->status != SCLP_REQ_DONE) { |
| pr_warning("sync request failed (cmd=0x%08x, " |
| "status=0x%02x)\n", cmd, request->status); |
| rc = -EIO; |
| } |
| out: |
| kfree(request); |
| return rc; |
| } |
| |
| /* |
| * CPU configuration related functions. |
| */ |
| |
| #define SCLP_CMDW_READ_CPU_INFO 0x00010001 |
| #define SCLP_CMDW_CONFIGURE_CPU 0x00110001 |
| #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001 |
| |
| struct read_cpu_info_sccb { |
| struct sccb_header header; |
| u16 nr_configured; |
| u16 offset_configured; |
| u16 nr_standby; |
| u16 offset_standby; |
| u8 reserved[4096 - 16]; |
| } __attribute__((packed, aligned(PAGE_SIZE))); |
| |
| static void sclp_fill_cpu_info(struct sclp_cpu_info *info, |
| struct read_cpu_info_sccb *sccb) |
| { |
| char *page = (char *) sccb; |
| |
| memset(info, 0, sizeof(*info)); |
| info->configured = sccb->nr_configured; |
| info->standby = sccb->nr_standby; |
| info->combined = sccb->nr_configured + sccb->nr_standby; |
| info->has_cpu_type = sclp_fac84 & 0x1; |
| memcpy(&info->cpu, page + sccb->offset_configured, |
| info->combined * sizeof(struct sclp_cpu_entry)); |
| } |
| |
| int sclp_get_cpu_info(struct sclp_cpu_info *info) |
| { |
| int rc; |
| struct read_cpu_info_sccb *sccb; |
| |
| if (!SCLP_HAS_CPU_INFO) |
| return -EOPNOTSUPP; |
| sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| return -ENOMEM; |
| sccb->header.length = sizeof(*sccb); |
| rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb); |
| if (rc) |
| goto out; |
| if (sccb->header.response_code != 0x0010) { |
| pr_warning("readcpuinfo failed (response=0x%04x)\n", |
| sccb->header.response_code); |
| rc = -EIO; |
| goto out; |
| } |
| sclp_fill_cpu_info(info, sccb); |
| out: |
| free_page((unsigned long) sccb); |
| return rc; |
| } |
| |
| struct cpu_configure_sccb { |
| struct sccb_header header; |
| } __attribute__((packed, aligned(8))); |
| |
| static int do_cpu_configure(sclp_cmdw_t cmd) |
| { |
| struct cpu_configure_sccb *sccb; |
| int rc; |
| |
| if (!SCLP_HAS_CPU_RECONFIG) |
| return -EOPNOTSUPP; |
| /* |
| * This is not going to cross a page boundary since we force |
| * kmalloc to have a minimum alignment of 8 bytes on s390. |
| */ |
| sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| return -ENOMEM; |
| sccb->header.length = sizeof(*sccb); |
| rc = do_sync_request(cmd, sccb); |
| if (rc) |
| goto out; |
| switch (sccb->header.response_code) { |
| case 0x0020: |
| case 0x0120: |
| break; |
| default: |
| pr_warning("configure cpu failed (cmd=0x%08x, " |
| "response=0x%04x)\n", cmd, |
| sccb->header.response_code); |
| rc = -EIO; |
| break; |
| } |
| out: |
| kfree(sccb); |
| return rc; |
| } |
| |
| int sclp_cpu_configure(u8 cpu) |
| { |
| return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8); |
| } |
| |
| int sclp_cpu_deconfigure(u8 cpu) |
| { |
| return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8); |
| } |
| |
| #ifdef CONFIG_MEMORY_HOTPLUG |
| |
| static DEFINE_MUTEX(sclp_mem_mutex); |
| static LIST_HEAD(sclp_mem_list); |
| static u8 sclp_max_storage_id; |
| static unsigned long sclp_storage_ids[256 / BITS_PER_LONG]; |
| static int sclp_mem_state_changed; |
| |
| struct memory_increment { |
| struct list_head list; |
| u16 rn; |
| int standby; |
| int usecount; |
| }; |
| |
| struct assign_storage_sccb { |
| struct sccb_header header; |
| u16 rn; |
| } __packed; |
| |
| int arch_get_memory_phys_device(unsigned long start_pfn) |
| { |
| if (!rzm) |
| return 0; |
| return PFN_PHYS(start_pfn) >> ilog2(rzm); |
| } |
| |
| static unsigned long long rn2addr(u16 rn) |
| { |
| return (unsigned long long) (rn - 1) * rzm; |
| } |
| |
| static int do_assign_storage(sclp_cmdw_t cmd, u16 rn) |
| { |
| struct assign_storage_sccb *sccb; |
| int rc; |
| |
| sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| return -ENOMEM; |
| sccb->header.length = PAGE_SIZE; |
| sccb->rn = rn; |
| rc = do_sync_request(cmd, sccb); |
| if (rc) |
| goto out; |
| switch (sccb->header.response_code) { |
| case 0x0020: |
| case 0x0120: |
| break; |
| default: |
| pr_warning("assign storage failed (cmd=0x%08x, " |
| "response=0x%04x, rn=0x%04x)\n", cmd, |
| sccb->header.response_code, rn); |
| rc = -EIO; |
| break; |
| } |
| out: |
| free_page((unsigned long) sccb); |
| return rc; |
| } |
| |
| static int sclp_assign_storage(u16 rn) |
| { |
| unsigned long long start; |
| int rc; |
| |
| rc = do_assign_storage(0x000d0001, rn); |
| if (rc) |
| return rc; |
| start = rn2addr(rn); |
| storage_key_init_range(start, start + rzm); |
| return 0; |
| } |
| |
| static int sclp_unassign_storage(u16 rn) |
| { |
| return do_assign_storage(0x000c0001, rn); |
| } |
| |
| struct attach_storage_sccb { |
| struct sccb_header header; |
| u16 :16; |
| u16 assigned; |
| u32 :32; |
| u32 entries[0]; |
| } __packed; |
| |
| static int sclp_attach_storage(u8 id) |
| { |
| struct attach_storage_sccb *sccb; |
| int rc; |
| int i; |
| |
| sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| return -ENOMEM; |
| sccb->header.length = PAGE_SIZE; |
| rc = do_sync_request(0x00080001 | id << 8, sccb); |
| if (rc) |
| goto out; |
| switch (sccb->header.response_code) { |
| case 0x0020: |
| set_bit(id, sclp_storage_ids); |
| for (i = 0; i < sccb->assigned; i++) { |
| if (sccb->entries[i]) |
| sclp_unassign_storage(sccb->entries[i] >> 16); |
| } |
| break; |
| default: |
| rc = -EIO; |
| break; |
| } |
| out: |
| free_page((unsigned long) sccb); |
| return rc; |
| } |
| |
| static int sclp_mem_change_state(unsigned long start, unsigned long size, |
| int online) |
| { |
| struct memory_increment *incr; |
| unsigned long long istart; |
| int rc = 0; |
| |
| list_for_each_entry(incr, &sclp_mem_list, list) { |
| istart = rn2addr(incr->rn); |
| if (start + size - 1 < istart) |
| break; |
| if (start > istart + rzm - 1) |
| continue; |
| if (online) { |
| if (incr->usecount++) |
| continue; |
| /* |
| * Don't break the loop if one assign fails. Loop may |
| * be walked again on CANCEL and we can't save |
| * information if state changed before or not. |
| * So continue and increase usecount for all increments. |
| */ |
| rc |= sclp_assign_storage(incr->rn); |
| } else { |
| if (--incr->usecount) |
| continue; |
| sclp_unassign_storage(incr->rn); |
| } |
| } |
| return rc ? -EIO : 0; |
| } |
| |
| static int sclp_mem_notifier(struct notifier_block *nb, |
| unsigned long action, void *data) |
| { |
| unsigned long start, size; |
| struct memory_notify *arg; |
| unsigned char id; |
| int rc = 0; |
| |
| arg = data; |
| start = arg->start_pfn << PAGE_SHIFT; |
| size = arg->nr_pages << PAGE_SHIFT; |
| mutex_lock(&sclp_mem_mutex); |
| for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) |
| sclp_attach_storage(id); |
| switch (action) { |
| case MEM_ONLINE: |
| case MEM_GOING_OFFLINE: |
| case MEM_CANCEL_OFFLINE: |
| break; |
| case MEM_GOING_ONLINE: |
| rc = sclp_mem_change_state(start, size, 1); |
| break; |
| case MEM_CANCEL_ONLINE: |
| sclp_mem_change_state(start, size, 0); |
| break; |
| case MEM_OFFLINE: |
| sclp_mem_change_state(start, size, 0); |
| break; |
| default: |
| rc = -EINVAL; |
| break; |
| } |
| if (!rc) |
| sclp_mem_state_changed = 1; |
| mutex_unlock(&sclp_mem_mutex); |
| return rc ? NOTIFY_BAD : NOTIFY_OK; |
| } |
| |
| static struct notifier_block sclp_mem_nb = { |
| .notifier_call = sclp_mem_notifier, |
| }; |
| |
| static void __init add_memory_merged(u16 rn) |
| { |
| static u16 first_rn, num; |
| unsigned long long start, size; |
| |
| if (rn && first_rn && (first_rn + num == rn)) { |
| num++; |
| return; |
| } |
| if (!first_rn) |
| goto skip_add; |
| start = rn2addr(first_rn); |
| size = (unsigned long long ) num * rzm; |
| if (start >= VMEM_MAX_PHYS) |
| goto skip_add; |
| if (start + size > VMEM_MAX_PHYS) |
| size = VMEM_MAX_PHYS - start; |
| if (memory_end_set && (start >= memory_end)) |
| goto skip_add; |
| if (memory_end_set && (start + size > memory_end)) |
| size = memory_end - start; |
| add_memory(0, start, size); |
| skip_add: |
| first_rn = rn; |
| num = 1; |
| } |
| |
| static void __init sclp_add_standby_memory(void) |
| { |
| struct memory_increment *incr; |
| |
| list_for_each_entry(incr, &sclp_mem_list, list) |
| if (incr->standby) |
| add_memory_merged(incr->rn); |
| add_memory_merged(0); |
| } |
| |
| static void __init insert_increment(u16 rn, int standby, int assigned) |
| { |
| struct memory_increment *incr, *new_incr; |
| struct list_head *prev; |
| u16 last_rn; |
| |
| new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL); |
| if (!new_incr) |
| return; |
| new_incr->rn = rn; |
| new_incr->standby = standby; |
| if (!standby) |
| new_incr->usecount = 1; |
| last_rn = 0; |
| prev = &sclp_mem_list; |
| list_for_each_entry(incr, &sclp_mem_list, list) { |
| if (assigned && incr->rn > rn) |
| break; |
| if (!assigned && incr->rn - last_rn > 1) |
| break; |
| last_rn = incr->rn; |
| prev = &incr->list; |
| } |
| if (!assigned) |
| new_incr->rn = last_rn + 1; |
| if (new_incr->rn > rnmax) { |
| kfree(new_incr); |
| return; |
| } |
| list_add(&new_incr->list, prev); |
| } |
| |
| static int sclp_mem_freeze(struct device *dev) |
| { |
| if (!sclp_mem_state_changed) |
| return 0; |
| pr_err("Memory hotplug state changed, suspend refused.\n"); |
| return -EPERM; |
| } |
| |
| struct read_storage_sccb { |
| struct sccb_header header; |
| u16 max_id; |
| u16 assigned; |
| u16 standby; |
| u16 :16; |
| u32 entries[0]; |
| } __packed; |
| |
| static const struct dev_pm_ops sclp_mem_pm_ops = { |
| .freeze = sclp_mem_freeze, |
| }; |
| |
| static struct platform_driver sclp_mem_pdrv = { |
| .driver = { |
| .name = "sclp_mem", |
| .pm = &sclp_mem_pm_ops, |
| }, |
| }; |
| |
| static int __init sclp_detect_standby_memory(void) |
| { |
| struct platform_device *sclp_pdev; |
| struct read_storage_sccb *sccb; |
| int i, id, assigned, rc; |
| |
| if (!early_read_info_sccb_valid) |
| return 0; |
| if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL) |
| return 0; |
| rc = -ENOMEM; |
| sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| goto out; |
| assigned = 0; |
| for (id = 0; id <= sclp_max_storage_id; id++) { |
| memset(sccb, 0, PAGE_SIZE); |
| sccb->header.length = PAGE_SIZE; |
| rc = do_sync_request(0x00040001 | id << 8, sccb); |
| if (rc) |
| goto out; |
| switch (sccb->header.response_code) { |
| case 0x0010: |
| set_bit(id, sclp_storage_ids); |
| for (i = 0; i < sccb->assigned; i++) { |
| if (!sccb->entries[i]) |
| continue; |
| assigned++; |
| insert_increment(sccb->entries[i] >> 16, 0, 1); |
| } |
| break; |
| case 0x0310: |
| break; |
| case 0x0410: |
| for (i = 0; i < sccb->assigned; i++) { |
| if (!sccb->entries[i]) |
| continue; |
| assigned++; |
| insert_increment(sccb->entries[i] >> 16, 1, 1); |
| } |
| break; |
| default: |
| rc = -EIO; |
| break; |
| } |
| if (!rc) |
| sclp_max_storage_id = sccb->max_id; |
| } |
| if (rc || list_empty(&sclp_mem_list)) |
| goto out; |
| for (i = 1; i <= rnmax - assigned; i++) |
| insert_increment(0, 1, 0); |
| rc = register_memory_notifier(&sclp_mem_nb); |
| if (rc) |
| goto out; |
| rc = platform_driver_register(&sclp_mem_pdrv); |
| if (rc) |
| goto out; |
| sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0); |
| rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0; |
| if (rc) |
| goto out_driver; |
| sclp_add_standby_memory(); |
| goto out; |
| out_driver: |
| platform_driver_unregister(&sclp_mem_pdrv); |
| out: |
| free_page((unsigned long) sccb); |
| return rc; |
| } |
| __initcall(sclp_detect_standby_memory); |
| |
| #endif /* CONFIG_MEMORY_HOTPLUG */ |
| |
| /* |
| * Channel path configuration related functions. |
| */ |
| |
| #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 |
| #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 |
| #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 |
| |
| struct chp_cfg_sccb { |
| struct sccb_header header; |
| u8 ccm; |
| u8 reserved[6]; |
| u8 cssid; |
| } __attribute__((packed)); |
| |
| static int do_chp_configure(sclp_cmdw_t cmd) |
| { |
| struct chp_cfg_sccb *sccb; |
| int rc; |
| |
| if (!SCLP_HAS_CHP_RECONFIG) |
| return -EOPNOTSUPP; |
| /* Prepare sccb. */ |
| sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| return -ENOMEM; |
| sccb->header.length = sizeof(*sccb); |
| rc = do_sync_request(cmd, sccb); |
| if (rc) |
| goto out; |
| switch (sccb->header.response_code) { |
| case 0x0020: |
| case 0x0120: |
| case 0x0440: |
| case 0x0450: |
| break; |
| default: |
| pr_warning("configure channel-path failed " |
| "(cmd=0x%08x, response=0x%04x)\n", cmd, |
| sccb->header.response_code); |
| rc = -EIO; |
| break; |
| } |
| out: |
| free_page((unsigned long) sccb); |
| return rc; |
| } |
| |
| /** |
| * sclp_chp_configure - perform configure channel-path sclp command |
| * @chpid: channel-path ID |
| * |
| * Perform configure channel-path command sclp command for specified chpid. |
| * Return 0 after command successfully finished, non-zero otherwise. |
| */ |
| int sclp_chp_configure(struct chp_id chpid) |
| { |
| return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); |
| } |
| |
| /** |
| * sclp_chp_deconfigure - perform deconfigure channel-path sclp command |
| * @chpid: channel-path ID |
| * |
| * Perform deconfigure channel-path command sclp command for specified chpid |
| * and wait for completion. On success return 0. Return non-zero otherwise. |
| */ |
| int sclp_chp_deconfigure(struct chp_id chpid) |
| { |
| return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); |
| } |
| |
| struct chp_info_sccb { |
| struct sccb_header header; |
| u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; |
| u8 standby[SCLP_CHP_INFO_MASK_SIZE]; |
| u8 configured[SCLP_CHP_INFO_MASK_SIZE]; |
| u8 ccm; |
| u8 reserved[6]; |
| u8 cssid; |
| } __attribute__((packed)); |
| |
| /** |
| * sclp_chp_read_info - perform read channel-path information sclp command |
| * @info: resulting channel-path information data |
| * |
| * Perform read channel-path information sclp command and wait for completion. |
| * On success, store channel-path information in @info and return 0. Return |
| * non-zero otherwise. |
| */ |
| int sclp_chp_read_info(struct sclp_chp_info *info) |
| { |
| struct chp_info_sccb *sccb; |
| int rc; |
| |
| if (!SCLP_HAS_CHP_INFO) |
| return -EOPNOTSUPP; |
| /* Prepare sccb. */ |
| sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
| if (!sccb) |
| return -ENOMEM; |
| sccb->header.length = sizeof(*sccb); |
| rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); |
| if (rc) |
| goto out; |
| if (sccb->header.response_code != 0x0010) { |
| pr_warning("read channel-path info failed " |
| "(response=0x%04x)\n", sccb->header.response_code); |
| rc = -EIO; |
| goto out; |
| } |
| memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); |
| memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); |
| memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); |
| out: |
| free_page((unsigned long) sccb); |
| return rc; |
| } |