Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm...
[linux-2.6.git] / drivers / s390 / char / sclp_cmd.c
index b5c2339..231a1d8 100644 (file)
@@ -1,21 +1,29 @@
 /*
- *  drivers/s390/char/sclp_cmd.c
+ * Copyright IBM Corp. 2007, 2009
  *
- *    Copyright IBM Corp. 2007
- *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
- *              Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
+ * 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 "sclp.h"
+#include <asm/setup.h>
+#include <asm/ctl_reg.h>
 
-#define TAG    "sclp_cmd: "
+#include "sclp.h"
 
 #define SCLP_CMDW_READ_SCP_INFO                0x00020001
 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
@@ -43,6 +51,8 @@ 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)
 {
@@ -52,8 +62,8 @@ static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
        rc = sclp_service_call(cmd, sccb);
        if (rc)
                goto out;
-       __load_psw_mask(PSW_BASE_BITS | PSW_MASK_EXT |
-                       PSW_MASK_WAIT | PSW_DEFAULT_KEY);
+       __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. */
@@ -62,7 +72,7 @@ out:
        return rc;
 }
 
-void __init sclp_read_info_early(void)
+static void __init sclp_read_info_early(void)
 {
        int rc;
        int i;
@@ -75,6 +85,7 @@ void __init sclp_read_info_early(void)
                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);
@@ -92,34 +103,33 @@ void __init sclp_read_info_early(void)
 
 void __init sclp_facilities_detect(void)
 {
+       struct read_info_sccb *sccb;
+
+       sclp_read_info_early();
        if (!early_read_info_sccb_valid)
                return;
-       sclp_facilities = early_read_info_sccb.facilities;
-       sclp_fac84 = early_read_info_sccb.fac84;
+
+       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 __init sclp_memory_detect(void)
+unsigned long long sclp_get_rnmax(void)
 {
-       unsigned long long memsize;
-       struct read_info_sccb *sccb;
+       return rnmax;
+}
 
-       if (!early_read_info_sccb_valid)
-               return 0;
-       sccb = &early_read_info_sccb;
-       if (sccb->rnsize)
-               memsize = sccb->rnsize << 20;
-       else
-               memsize = sccb->rnsize2 << 20;
-       if (sccb->rnmax)
-               memsize *= sccb->rnmax;
-       else
-               memsize *= sccb->rnmax2;
-       return memsize;
+unsigned long long sclp_get_rzm(void)
+{
+       return rzm;
 }
 
 /*
- * This function will be called after sclp_memory_detect(), which gets called
- * early from early.c code. Therefore the sccb should have valid contents.
+ * 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)
 {
@@ -165,8 +175,8 @@ static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
 
        /* Check response. */
        if (request->status != SCLP_REQ_DONE) {
-               printk(KERN_WARNING TAG "sync request failed "
-                      "(cmd=0x%08x, status=0x%02x)\n", cmd, request->status);
+               pr_warning("sync request failed (cmd=0x%08x, "
+                          "status=0x%02x)\n", cmd, request->status);
                rc = -EIO;
        }
 out:
@@ -220,8 +230,8 @@ int sclp_get_cpu_info(struct sclp_cpu_info *info)
        if (rc)
                goto out;
        if (sccb->header.response_code != 0x0010) {
-               printk(KERN_WARNING TAG "readcpuinfo failed "
-                      "(response=0x%04x)\n", sccb->header.response_code);
+               pr_warning("readcpuinfo failed (response=0x%04x)\n",
+                          sccb->header.response_code);
                rc = -EIO;
                goto out;
        }
@@ -258,8 +268,9 @@ static int do_cpu_configure(sclp_cmdw_t cmd)
        case 0x0120:
                break;
        default:
-               printk(KERN_WARNING TAG "configure cpu failed (cmd=0x%08x, "
-                      "response=0x%04x)\n", cmd, sccb->header.response_code);
+               pr_warning("configure cpu failed (cmd=0x%08x, "
+                          "response=0x%04x)\n", cmd,
+                          sccb->header.response_code);
                rc = -EIO;
                break;
        }
@@ -278,6 +289,360 @@ 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);
+}
+
+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.
  */
@@ -315,9 +680,9 @@ static int do_chp_configure(sclp_cmdw_t cmd)
        case 0x0450:
                break;
        default:
-               printk(KERN_WARNING TAG "configure channel-path failed "
-                      "(cmd=0x%08x, response=0x%04x)\n", cmd,
-                      sccb->header.response_code);
+               pr_warning("configure channel-path failed "
+                          "(cmd=0x%08x, response=0x%04x)\n", cmd,
+                          sccb->header.response_code);
                rc = -EIO;
                break;
        }
@@ -384,8 +749,8 @@ int sclp_chp_read_info(struct sclp_chp_info *info)
        if (rc)
                goto out;
        if (sccb->header.response_code != 0x0010) {
-               printk(KERN_WARNING TAG "read channel-path info failed "
-                      "(response=0x%04x)\n", sccb->header.response_code);
+               pr_warning("read channel-path info failed "
+                          "(response=0x%04x)\n", sccb->header.response_code);
                rc = -EIO;
                goto out;
        }