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- /*
- * 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/platform_device.h>
- #include <asm/chpid.h>
- #include <asm/sclp.h>
- #include <asm/setup.h>
- #include <asm/ctl_reg.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 _reserved3[91 - 85]; /* 85-90 */
- 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 read_info_sccb __initdata early_read_info_sccb;
- static int __initdata early_read_info_sccb_valid;
- u64 sclp_facilities;
- static u8 sclp_fac84;
- 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;
- }
- }
- 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;
- rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
- rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
- rzm <<= 20;
- }
- unsigned long long sclp_get_rnmax(void)
- {
- return rnmax;
- }
- unsigned long long sclp_get_rzm(void)
- {
- return rzm;
- }
- /*
- * 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)
- {
- return do_assign_storage(0x000d0001, rn);
- }
- 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);
- }
- #define MEM_SCT_SIZE (1UL << SECTION_SIZE_BITS)
- 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 = rzm > MEM_SCT_SIZE ? rzm/MEM_SCT_SIZE : 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;
- }
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