658 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright IBM Corp. 2007,20124 *5 * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>6 */7 8#define KMSG_COMPONENT "sclp_cmd"9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt10 11#include <linux/completion.h>12#include <linux/init.h>13#include <linux/errno.h>14#include <linux/err.h>15#include <linux/export.h>16#include <linux/slab.h>17#include <linux/string.h>18#include <linux/mm.h>19#include <linux/mmzone.h>20#include <linux/memory.h>21#include <linux/memory_hotplug.h>22#include <linux/module.h>23#include <asm/ctlreg.h>24#include <asm/chpid.h>25#include <asm/setup.h>26#include <asm/page.h>27#include <asm/sclp.h>28#include <asm/numa.h>29#include <asm/facility.h>30#include <asm/page-states.h>31 32#include "sclp.h"33 34#define SCLP_CMDW_ASSIGN_STORAGE 0x000d000135#define SCLP_CMDW_UNASSIGN_STORAGE 0x000c000136 37static void sclp_sync_callback(struct sclp_req *req, void *data)38{39 struct completion *completion = data;40 41 complete(completion);42}43 44int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)45{46 return sclp_sync_request_timeout(cmd, sccb, 0);47}48 49int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)50{51 struct completion completion;52 struct sclp_req *request;53 int rc;54 55 request = kzalloc(sizeof(*request), GFP_KERNEL);56 if (!request)57 return -ENOMEM;58 if (timeout)59 request->queue_timeout = timeout;60 request->command = cmd;61 request->sccb = sccb;62 request->status = SCLP_REQ_FILLED;63 request->callback = sclp_sync_callback;64 request->callback_data = &completion;65 init_completion(&completion);66 67 /* Perform sclp request. */68 rc = sclp_add_request(request);69 if (rc)70 goto out;71 wait_for_completion(&completion);72 73 /* Check response. */74 if (request->status != SCLP_REQ_DONE) {75 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",76 cmd, request->status);77 rc = -EIO;78 }79out:80 kfree(request);81 return rc;82}83 84/*85 * CPU configuration related functions.86 */87 88#define SCLP_CMDW_CONFIGURE_CPU 0x0011000189#define SCLP_CMDW_DECONFIGURE_CPU 0x0010000190 91int _sclp_get_core_info(struct sclp_core_info *info)92{93 int rc;94 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;95 struct read_cpu_info_sccb *sccb;96 97 if (!SCLP_HAS_CPU_INFO)98 return -EOPNOTSUPP;99 100 sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));101 if (!sccb)102 return -ENOMEM;103 sccb->header.length = length;104 sccb->header.control_mask[2] = 0x80;105 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,106 SCLP_QUEUE_INTERVAL);107 if (rc)108 goto out;109 if (sccb->header.response_code != 0x0010) {110 pr_warn("readcpuinfo failed (response=0x%04x)\n",111 sccb->header.response_code);112 rc = -EIO;113 goto out;114 }115 sclp_fill_core_info(info, sccb);116out:117 free_pages((unsigned long) sccb, get_order(length));118 return rc;119}120 121struct cpu_configure_sccb {122 struct sccb_header header;123} __attribute__((packed, aligned(8)));124 125static int do_core_configure(sclp_cmdw_t cmd)126{127 struct cpu_configure_sccb *sccb;128 int rc;129 130 if (!SCLP_HAS_CPU_RECONFIG)131 return -EOPNOTSUPP;132 /*133 * This is not going to cross a page boundary since we force134 * kmalloc to have a minimum alignment of 8 bytes on s390.135 */136 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);137 if (!sccb)138 return -ENOMEM;139 sccb->header.length = sizeof(*sccb);140 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);141 if (rc)142 goto out;143 switch (sccb->header.response_code) {144 case 0x0020:145 case 0x0120:146 break;147 default:148 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",149 cmd, sccb->header.response_code);150 rc = -EIO;151 break;152 }153out:154 kfree(sccb);155 return rc;156}157 158int sclp_core_configure(u8 core)159{160 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);161}162 163int sclp_core_deconfigure(u8 core)164{165 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);166}167 168#ifdef CONFIG_MEMORY_HOTPLUG169 170static DEFINE_MUTEX(sclp_mem_mutex);171static LIST_HEAD(sclp_mem_list);172static u8 sclp_max_storage_id;173static DECLARE_BITMAP(sclp_storage_ids, 256);174 175struct memory_increment {176 struct list_head list;177 u16 rn;178 int standby;179};180 181struct assign_storage_sccb {182 struct sccb_header header;183 u16 rn;184} __packed;185 186int arch_get_memory_phys_device(unsigned long start_pfn)187{188 if (!sclp.rzm)189 return 0;190 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);191}192 193static unsigned long long rn2addr(u16 rn)194{195 return (unsigned long long) (rn - 1) * sclp.rzm;196}197 198static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)199{200 struct assign_storage_sccb *sccb;201 int rc;202 203 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);204 if (!sccb)205 return -ENOMEM;206 sccb->header.length = PAGE_SIZE;207 sccb->rn = rn;208 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);209 if (rc)210 goto out;211 switch (sccb->header.response_code) {212 case 0x0020:213 case 0x0120:214 break;215 default:216 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",217 cmd, sccb->header.response_code, rn);218 rc = -EIO;219 break;220 }221out:222 free_page((unsigned long) sccb);223 return rc;224}225 226static int sclp_assign_storage(u16 rn)227{228 unsigned long long start;229 int rc;230 231 rc = do_assign_storage(SCLP_CMDW_ASSIGN_STORAGE, rn);232 if (rc)233 return rc;234 start = rn2addr(rn);235 storage_key_init_range(start, start + sclp.rzm);236 return 0;237}238 239static int sclp_unassign_storage(u16 rn)240{241 return do_assign_storage(SCLP_CMDW_UNASSIGN_STORAGE, rn);242}243 244struct attach_storage_sccb {245 struct sccb_header header;246 u16 :16;247 u16 assigned;248 u32 :32;249 u32 entries[];250} __packed;251 252static int sclp_attach_storage(u8 id)253{254 struct attach_storage_sccb *sccb;255 int rc;256 int i;257 258 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);259 if (!sccb)260 return -ENOMEM;261 sccb->header.length = PAGE_SIZE;262 sccb->header.function_code = 0x40;263 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,264 SCLP_QUEUE_INTERVAL);265 if (rc)266 goto out;267 switch (sccb->header.response_code) {268 case 0x0020:269 set_bit(id, sclp_storage_ids);270 for (i = 0; i < sccb->assigned; i++) {271 if (sccb->entries[i])272 sclp_unassign_storage(sccb->entries[i] >> 16);273 }274 break;275 default:276 rc = -EIO;277 break;278 }279out:280 free_page((unsigned long) sccb);281 return rc;282}283 284static int sclp_mem_change_state(unsigned long start, unsigned long size,285 int online)286{287 struct memory_increment *incr;288 unsigned long long istart;289 int rc = 0;290 291 list_for_each_entry(incr, &sclp_mem_list, list) {292 istart = rn2addr(incr->rn);293 if (start + size - 1 < istart)294 break;295 if (start > istart + sclp.rzm - 1)296 continue;297 if (online)298 rc |= sclp_assign_storage(incr->rn);299 else300 sclp_unassign_storage(incr->rn);301 if (rc == 0)302 incr->standby = online ? 0 : 1;303 }304 return rc ? -EIO : 0;305}306 307static bool contains_standby_increment(unsigned long start, unsigned long end)308{309 struct memory_increment *incr;310 unsigned long istart;311 312 list_for_each_entry(incr, &sclp_mem_list, list) {313 istart = rn2addr(incr->rn);314 if (end - 1 < istart)315 continue;316 if (start > istart + sclp.rzm - 1)317 continue;318 if (incr->standby)319 return true;320 }321 return false;322}323 324static int sclp_mem_notifier(struct notifier_block *nb,325 unsigned long action, void *data)326{327 unsigned long start, size;328 struct memory_notify *arg;329 unsigned char id;330 int rc = 0;331 332 arg = data;333 start = arg->start_pfn << PAGE_SHIFT;334 size = arg->nr_pages << PAGE_SHIFT;335 mutex_lock(&sclp_mem_mutex);336 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)337 sclp_attach_storage(id);338 switch (action) {339 case MEM_GOING_OFFLINE:340 /*341 * We do not allow to set memory blocks offline that contain342 * standby memory. This is done to simplify the "memory online"343 * case.344 */345 if (contains_standby_increment(start, start + size))346 rc = -EPERM;347 break;348 case MEM_PREPARE_ONLINE:349 /*350 * Access the altmap_start_pfn and altmap_nr_pages fields351 * within the struct memory_notify specifically when dealing352 * with only MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers.353 *354 * When altmap is in use, take the specified memory range355 * online, which includes the altmap.356 */357 if (arg->altmap_nr_pages) {358 start = PFN_PHYS(arg->altmap_start_pfn);359 size += PFN_PHYS(arg->altmap_nr_pages);360 }361 rc = sclp_mem_change_state(start, size, 1);362 if (rc || !arg->altmap_nr_pages)363 break;364 /*365 * Set CMMA state to nodat here, since the struct page memory366 * at the beginning of the memory block will not go through the367 * buddy allocator later.368 */369 __arch_set_page_nodat((void *)__va(start), arg->altmap_nr_pages);370 break;371 case MEM_FINISH_OFFLINE:372 /*373 * When altmap is in use, take the specified memory range374 * offline, which includes the altmap.375 */376 if (arg->altmap_nr_pages) {377 start = PFN_PHYS(arg->altmap_start_pfn);378 size += PFN_PHYS(arg->altmap_nr_pages);379 }380 sclp_mem_change_state(start, size, 0);381 break;382 default:383 break;384 }385 mutex_unlock(&sclp_mem_mutex);386 return rc ? NOTIFY_BAD : NOTIFY_OK;387}388 389static struct notifier_block sclp_mem_nb = {390 .notifier_call = sclp_mem_notifier,391};392 393static void __init align_to_block_size(unsigned long long *start,394 unsigned long long *size,395 unsigned long long alignment)396{397 unsigned long long start_align, size_align;398 399 start_align = roundup(*start, alignment);400 size_align = rounddown(*start + *size, alignment) - start_align;401 402 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",403 *start, size_align >> 20, *size >> 20);404 *start = start_align;405 *size = size_align;406}407 408static void __init add_memory_merged(u16 rn)409{410 unsigned long long start, size, addr, block_size;411 static u16 first_rn, num;412 413 if (rn && first_rn && (first_rn + num == rn)) {414 num++;415 return;416 }417 if (!first_rn)418 goto skip_add;419 start = rn2addr(first_rn);420 size = (unsigned long long) num * sclp.rzm;421 if (start >= ident_map_size)422 goto skip_add;423 if (start + size > ident_map_size)424 size = ident_map_size - start;425 block_size = memory_block_size_bytes();426 align_to_block_size(&start, &size, block_size);427 if (!size)428 goto skip_add;429 for (addr = start; addr < start + size; addr += block_size)430 add_memory(0, addr, block_size,431 MACHINE_HAS_EDAT1 ?432 MHP_MEMMAP_ON_MEMORY | MHP_OFFLINE_INACCESSIBLE : MHP_NONE);433skip_add:434 first_rn = rn;435 num = 1;436}437 438static void __init sclp_add_standby_memory(void)439{440 struct memory_increment *incr;441 442 list_for_each_entry(incr, &sclp_mem_list, list)443 if (incr->standby)444 add_memory_merged(incr->rn);445 add_memory_merged(0);446}447 448static void __init insert_increment(u16 rn, int standby, int assigned)449{450 struct memory_increment *incr, *new_incr;451 struct list_head *prev;452 u16 last_rn;453 454 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);455 if (!new_incr)456 return;457 new_incr->rn = rn;458 new_incr->standby = standby;459 last_rn = 0;460 prev = &sclp_mem_list;461 list_for_each_entry(incr, &sclp_mem_list, list) {462 if (assigned && incr->rn > rn)463 break;464 if (!assigned && incr->rn - last_rn > 1)465 break;466 last_rn = incr->rn;467 prev = &incr->list;468 }469 if (!assigned)470 new_incr->rn = last_rn + 1;471 if (new_incr->rn > sclp.rnmax) {472 kfree(new_incr);473 return;474 }475 list_add(&new_incr->list, prev);476}477 478static int __init sclp_detect_standby_memory(void)479{480 struct read_storage_sccb *sccb;481 int i, id, assigned, rc;482 483 if (oldmem_data.start) /* No standby memory in kdump mode */484 return 0;485 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)486 return 0;487 rc = -ENOMEM;488 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);489 if (!sccb)490 goto out;491 assigned = 0;492 for (id = 0; id <= sclp_max_storage_id; id++) {493 memset(sccb, 0, PAGE_SIZE);494 sccb->header.length = PAGE_SIZE;495 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);496 if (rc)497 goto out;498 switch (sccb->header.response_code) {499 case 0x0010:500 set_bit(id, sclp_storage_ids);501 for (i = 0; i < sccb->assigned; i++) {502 if (!sccb->entries[i])503 continue;504 assigned++;505 insert_increment(sccb->entries[i] >> 16, 0, 1);506 }507 break;508 case 0x0310:509 break;510 case 0x0410:511 for (i = 0; i < sccb->assigned; i++) {512 if (!sccb->entries[i])513 continue;514 assigned++;515 insert_increment(sccb->entries[i] >> 16, 1, 1);516 }517 break;518 default:519 rc = -EIO;520 break;521 }522 if (!rc)523 sclp_max_storage_id = sccb->max_id;524 }525 if (rc || list_empty(&sclp_mem_list))526 goto out;527 for (i = 1; i <= sclp.rnmax - assigned; i++)528 insert_increment(0, 1, 0);529 rc = register_memory_notifier(&sclp_mem_nb);530 if (rc)531 goto out;532 sclp_add_standby_memory();533out:534 free_page((unsigned long) sccb);535 return rc;536}537__initcall(sclp_detect_standby_memory);538 539#endif /* CONFIG_MEMORY_HOTPLUG */540 541/*542 * Channel path configuration related functions.543 */544 545#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001546#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001547#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001548 549struct chp_cfg_sccb {550 struct sccb_header header;551 u8 ccm;552 u8 reserved[6];553 u8 cssid;554} __attribute__((packed));555 556static int do_chp_configure(sclp_cmdw_t cmd)557{558 struct chp_cfg_sccb *sccb;559 int rc;560 561 if (!SCLP_HAS_CHP_RECONFIG)562 return -EOPNOTSUPP;563 /* Prepare sccb. */564 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);565 if (!sccb)566 return -ENOMEM;567 sccb->header.length = sizeof(*sccb);568 rc = sclp_sync_request(cmd, sccb);569 if (rc)570 goto out;571 switch (sccb->header.response_code) {572 case 0x0020:573 case 0x0120:574 case 0x0440:575 case 0x0450:576 break;577 default:578 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",579 cmd, sccb->header.response_code);580 rc = -EIO;581 break;582 }583out:584 free_page((unsigned long) sccb);585 return rc;586}587 588/**589 * sclp_chp_configure - perform configure channel-path sclp command590 * @chpid: channel-path ID591 *592 * Perform configure channel-path command sclp command for specified chpid.593 * Return 0 after command successfully finished, non-zero otherwise.594 */595int sclp_chp_configure(struct chp_id chpid)596{597 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);598}599 600/**601 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command602 * @chpid: channel-path ID603 *604 * Perform deconfigure channel-path command sclp command for specified chpid605 * and wait for completion. On success return 0. Return non-zero otherwise.606 */607int sclp_chp_deconfigure(struct chp_id chpid)608{609 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);610}611 612struct chp_info_sccb {613 struct sccb_header header;614 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];615 u8 standby[SCLP_CHP_INFO_MASK_SIZE];616 u8 configured[SCLP_CHP_INFO_MASK_SIZE];617 u8 ccm;618 u8 reserved[6];619 u8 cssid;620} __attribute__((packed));621 622/**623 * sclp_chp_read_info - perform read channel-path information sclp command624 * @info: resulting channel-path information data625 *626 * Perform read channel-path information sclp command and wait for completion.627 * On success, store channel-path information in @info and return 0. Return628 * non-zero otherwise.629 */630int sclp_chp_read_info(struct sclp_chp_info *info)631{632 struct chp_info_sccb *sccb;633 int rc;634 635 if (!SCLP_HAS_CHP_INFO)636 return -EOPNOTSUPP;637 /* Prepare sccb. */638 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);639 if (!sccb)640 return -ENOMEM;641 sccb->header.length = sizeof(*sccb);642 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);643 if (rc)644 goto out;645 if (sccb->header.response_code != 0x0010) {646 pr_warn("read channel-path info failed (response=0x%04x)\n",647 sccb->header.response_code);648 rc = -EIO;649 goto out;650 }651 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);652 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);653 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);654out:655 free_page((unsigned long) sccb);656 return rc;657}658