[S390] Add support for memory hot-add via sclp.
Cc: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens
parent
421c175c4d
commit
e0bc24958e
@ -11,6 +11,9 @@
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/memory.h>
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#include <asm/chpid.h>
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#include <asm/sclp.h>
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#include "sclp.h"
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@ -43,6 +46,8 @@ static int __initdata early_read_info_sccb_valid;
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u64 sclp_facilities;
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static u8 sclp_fac84;
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static unsigned long long rzm;
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static unsigned long long rnmax;
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static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
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{
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@ -106,14 +111,10 @@ unsigned long long __init sclp_memory_detect(void)
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if (!early_read_info_sccb_valid)
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return 0;
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sccb = &early_read_info_sccb;
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if (sccb->rnsize)
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memsize = sccb->rnsize << 20;
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else
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memsize = sccb->rnsize2 << 20;
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if (sccb->rnmax)
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memsize *= sccb->rnmax;
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else
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memsize *= sccb->rnmax2;
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rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
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rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
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rzm <<= 20;
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memsize = rzm * rnmax;
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return memsize;
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}
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@ -278,6 +279,305 @@ int sclp_cpu_deconfigure(u8 cpu)
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return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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static DEFINE_MUTEX(sclp_mem_mutex);
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static LIST_HEAD(sclp_mem_list);
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static u8 sclp_max_storage_id;
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static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
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struct memory_increment {
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struct list_head list;
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u16 rn;
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int standby;
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int usecount;
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};
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struct assign_storage_sccb {
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struct sccb_header header;
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u16 rn;
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} __packed;
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static unsigned long long rn2addr(u16 rn)
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{
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return (unsigned long long) (rn - 1) * rzm;
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}
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static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
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{
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struct assign_storage_sccb *sccb;
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int rc;
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sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = PAGE_SIZE;
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sccb->rn = rn;
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rc = do_sync_request(cmd, sccb);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0020:
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case 0x0120:
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break;
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default:
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rc = -EIO;
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break;
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}
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out:
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free_page((unsigned long) sccb);
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return rc;
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}
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static int sclp_assign_storage(u16 rn)
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{
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return do_assign_storage(0x000d0001, rn);
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}
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static int sclp_unassign_storage(u16 rn)
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{
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return do_assign_storage(0x000c0001, rn);
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}
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struct attach_storage_sccb {
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struct sccb_header header;
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u16 :16;
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u16 assigned;
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u32 :32;
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u32 entries[0];
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} __packed;
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static int sclp_attach_storage(u8 id)
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{
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struct attach_storage_sccb *sccb;
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int rc;
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int i;
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sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = PAGE_SIZE;
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rc = do_sync_request(0x00080001 | id << 8, sccb);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0020:
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set_bit(id, sclp_storage_ids);
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for (i = 0; i < sccb->assigned; i++)
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sclp_unassign_storage(sccb->entries[i] >> 16);
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break;
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default:
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rc = -EIO;
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break;
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}
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out:
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free_page((unsigned long) sccb);
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return rc;
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}
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static int sclp_mem_change_state(unsigned long start, unsigned long size,
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int online)
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{
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struct memory_increment *incr;
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unsigned long long istart;
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int rc = 0;
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list_for_each_entry(incr, &sclp_mem_list, list) {
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istart = rn2addr(incr->rn);
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if (start + size - 1 < istart)
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break;
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if (start > istart + rzm - 1)
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continue;
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if (online) {
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if (incr->usecount++)
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continue;
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/*
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* Don't break the loop if one assign fails. Loop may
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* be walked again on CANCEL and we can't save
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* information if state changed before or not.
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* So continue and increase usecount for all increments.
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*/
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rc |= sclp_assign_storage(incr->rn);
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} else {
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if (--incr->usecount)
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continue;
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sclp_unassign_storage(incr->rn);
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}
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}
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return rc ? -EIO : 0;
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}
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static int sclp_mem_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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unsigned long start, size;
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struct memory_notify *arg;
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unsigned char id;
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int rc = 0;
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arg = data;
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start = arg->start_pfn << PAGE_SHIFT;
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size = arg->nr_pages << PAGE_SHIFT;
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mutex_lock(&sclp_mem_mutex);
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for (id = 0; id <= sclp_max_storage_id; id++)
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if (!test_bit(id, sclp_storage_ids))
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sclp_attach_storage(id);
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switch (action) {
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case MEM_ONLINE:
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break;
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case MEM_GOING_ONLINE:
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rc = sclp_mem_change_state(start, size, 1);
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break;
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case MEM_CANCEL_ONLINE:
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sclp_mem_change_state(start, size, 0);
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break;
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default:
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rc = -EINVAL;
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break;
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}
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mutex_unlock(&sclp_mem_mutex);
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return rc ? NOTIFY_BAD : NOTIFY_OK;
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}
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static struct notifier_block sclp_mem_nb = {
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.notifier_call = sclp_mem_notifier,
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};
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static void __init add_memory_merged(u16 rn)
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{
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static u16 first_rn, num;
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unsigned long long start, size;
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if (rn && first_rn && (first_rn + num == rn)) {
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num++;
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return;
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}
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if (!first_rn)
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goto skip_add;
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start = rn2addr(first_rn);
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size = (unsigned long long ) num * rzm;
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if (start >= VMEM_MAX_PHYS)
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goto skip_add;
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if (start + size > VMEM_MAX_PHYS)
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size = VMEM_MAX_PHYS - start;
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add_memory(0, start, size);
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skip_add:
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first_rn = rn;
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num = 1;
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}
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static void __init sclp_add_standby_memory(void)
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{
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struct memory_increment *incr;
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list_for_each_entry(incr, &sclp_mem_list, list)
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if (incr->standby)
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add_memory_merged(incr->rn);
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add_memory_merged(0);
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}
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static void __init insert_increment(u16 rn, int standby, int assigned)
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{
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struct memory_increment *incr, *new_incr;
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struct list_head *prev;
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u16 last_rn;
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new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
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if (!new_incr)
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return;
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new_incr->rn = rn;
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new_incr->standby = standby;
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last_rn = 0;
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prev = &sclp_mem_list;
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list_for_each_entry(incr, &sclp_mem_list, list) {
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if (assigned && incr->rn > rn)
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break;
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if (!assigned && incr->rn - last_rn > 1)
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break;
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last_rn = incr->rn;
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prev = &incr->list;
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}
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if (!assigned)
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new_incr->rn = last_rn + 1;
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if (new_incr->rn > rnmax) {
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kfree(new_incr);
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return;
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}
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list_add(&new_incr->list, prev);
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}
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struct read_storage_sccb {
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struct sccb_header header;
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u16 max_id;
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u16 assigned;
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u16 standby;
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u16 :16;
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u32 entries[0];
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} __packed;
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static int __init sclp_detect_standby_memory(void)
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{
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struct read_storage_sccb *sccb;
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int i, id, assigned, rc;
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if (!early_read_info_sccb_valid)
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return 0;
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if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
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return 0;
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rc = -ENOMEM;
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sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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goto out;
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assigned = 0;
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for (id = 0; id <= sclp_max_storage_id; id++) {
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memset(sccb, 0, PAGE_SIZE);
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sccb->header.length = PAGE_SIZE;
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rc = do_sync_request(0x00040001 | id << 8, sccb);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0010:
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set_bit(id, sclp_storage_ids);
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for (i = 0; i < sccb->assigned; i++) {
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if (!sccb->entries[i])
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continue;
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assigned++;
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insert_increment(sccb->entries[i] >> 16, 0, 1);
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}
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break;
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case 0x0310:
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break;
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case 0x0410:
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for (i = 0; i < sccb->assigned; i++) {
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if (!sccb->entries[i])
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continue;
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assigned++;
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insert_increment(sccb->entries[i] >> 16, 1, 1);
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}
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break;
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default:
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rc = -EIO;
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break;
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}
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if (!rc)
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sclp_max_storage_id = sccb->max_id;
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}
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if (rc || list_empty(&sclp_mem_list))
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goto out;
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for (i = 1; i <= rnmax - assigned; i++)
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insert_increment(0, 1, 0);
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rc = register_memory_notifier(&sclp_mem_nb);
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if (rc)
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goto out;
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sclp_add_standby_memory();
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out:
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free_page((unsigned long) sccb);
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return rc;
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}
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__initcall(sclp_detect_standby_memory);
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#endif /* CONFIG_MEMORY_HOTPLUG */
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/*
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* Channel path configuration related functions.
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*/
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