aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/mm
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/Makefile7
-rw-r--r--arch/s390/mm/cmm.c443
-rw-r--r--arch/s390/mm/extmem.c588
-rw-r--r--arch/s390/mm/fault.c586
-rw-r--r--arch/s390/mm/init.c310
-rw-r--r--arch/s390/mm/ioremap.c138
-rw-r--r--arch/s390/mm/mmap.c86
7 files changed, 2158 insertions, 0 deletions
diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
new file mode 100644
index 00000000000..aa9a42b6e62
--- /dev/null
+++ b/arch/s390/mm/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for the linux s390-specific parts of the memory manager.
+#
+
+obj-y := init.o fault.o ioremap.o extmem.o mmap.o
+obj-$(CONFIG_CMM) += cmm.o
+
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
new file mode 100644
index 00000000000..d30cdb4248a
--- /dev/null
+++ b/arch/s390/mm/cmm.c
@@ -0,0 +1,443 @@
+/*
+ * arch/s390/mm/cmm.c
+ *
+ * S390 version
+ * Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ * Collaborative memory management interface.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/sysctl.h>
+#include <linux/ctype.h>
+
+#include <asm/pgalloc.h>
+#include <asm/uaccess.h>
+
+#include "../../../drivers/s390/net/smsgiucv.h"
+
+#define CMM_NR_PAGES ((PAGE_SIZE / sizeof(unsigned long)) - 2)
+
+struct cmm_page_array {
+ struct cmm_page_array *next;
+ unsigned long index;
+ unsigned long pages[CMM_NR_PAGES];
+};
+
+static long cmm_pages = 0;
+static long cmm_timed_pages = 0;
+static volatile long cmm_pages_target = 0;
+static volatile long cmm_timed_pages_target = 0;
+static long cmm_timeout_pages = 0;
+static long cmm_timeout_seconds = 0;
+
+static struct cmm_page_array *cmm_page_list = 0;
+static struct cmm_page_array *cmm_timed_page_list = 0;
+
+static unsigned long cmm_thread_active = 0;
+static struct work_struct cmm_thread_starter;
+static wait_queue_head_t cmm_thread_wait;
+static struct timer_list cmm_timer;
+
+static void cmm_timer_fn(unsigned long);
+static void cmm_set_timer(void);
+
+static long
+cmm_strtoul(const char *cp, char **endp)
+{
+ unsigned int base = 10;
+
+ if (*cp == '0') {
+ base = 8;
+ cp++;
+ if ((*cp == 'x' || *cp == 'X') && isxdigit(cp[1])) {
+ base = 16;
+ cp++;
+ }
+ }
+ return simple_strtoul(cp, endp, base);
+}
+
+static long
+cmm_alloc_pages(long pages, long *counter, struct cmm_page_array **list)
+{
+ struct cmm_page_array *pa;
+ unsigned long page;
+
+ pa = *list;
+ while (pages) {
+ page = __get_free_page(GFP_NOIO);
+ if (!page)
+ break;
+ if (!pa || pa->index >= CMM_NR_PAGES) {
+ /* Need a new page for the page list. */
+ pa = (struct cmm_page_array *)
+ __get_free_page(GFP_NOIO);
+ if (!pa) {
+ free_page(page);
+ break;
+ }
+ pa->next = *list;
+ pa->index = 0;
+ *list = pa;
+ }
+ diag10(page);
+ pa->pages[pa->index++] = page;
+ (*counter)++;
+ pages--;
+ }
+ return pages;
+}
+
+static void
+cmm_free_pages(long pages, long *counter, struct cmm_page_array **list)
+{
+ struct cmm_page_array *pa;
+ unsigned long page;
+
+ pa = *list;
+ while (pages) {
+ if (!pa || pa->index <= 0)
+ break;
+ page = pa->pages[--pa->index];
+ if (pa->index == 0) {
+ pa = pa->next;
+ free_page((unsigned long) *list);
+ *list = pa;
+ }
+ free_page(page);
+ (*counter)--;
+ pages--;
+ }
+}
+
+static int
+cmm_thread(void *dummy)
+{
+ int rc;
+
+ daemonize("cmmthread");
+ while (1) {
+ rc = wait_event_interruptible(cmm_thread_wait,
+ (cmm_pages != cmm_pages_target ||
+ cmm_timed_pages != cmm_timed_pages_target));
+ if (rc == -ERESTARTSYS) {
+ /* Got kill signal. End thread. */
+ clear_bit(0, &cmm_thread_active);
+ cmm_pages_target = cmm_pages;
+ cmm_timed_pages_target = cmm_timed_pages;
+ break;
+ }
+ if (cmm_pages_target > cmm_pages) {
+ if (cmm_alloc_pages(1, &cmm_pages, &cmm_page_list))
+ cmm_pages_target = cmm_pages;
+ } else if (cmm_pages_target < cmm_pages) {
+ cmm_free_pages(1, &cmm_pages, &cmm_page_list);
+ }
+ if (cmm_timed_pages_target > cmm_timed_pages) {
+ if (cmm_alloc_pages(1, &cmm_timed_pages,
+ &cmm_timed_page_list))
+ cmm_timed_pages_target = cmm_timed_pages;
+ } else if (cmm_timed_pages_target < cmm_timed_pages) {
+ cmm_free_pages(1, &cmm_timed_pages,
+ &cmm_timed_page_list);
+ }
+ if (cmm_timed_pages > 0 && !timer_pending(&cmm_timer))
+ cmm_set_timer();
+ }
+ return 0;
+}
+
+static void
+cmm_start_thread(void)
+{
+ kernel_thread(cmm_thread, 0, 0);
+}
+
+static void
+cmm_kick_thread(void)
+{
+ if (!test_and_set_bit(0, &cmm_thread_active))
+ schedule_work(&cmm_thread_starter);
+ wake_up(&cmm_thread_wait);
+}
+
+static void
+cmm_set_timer(void)
+{
+ if (cmm_timed_pages_target <= 0 || cmm_timeout_seconds <= 0) {
+ if (timer_pending(&cmm_timer))
+ del_timer(&cmm_timer);
+ return;
+ }
+ if (timer_pending(&cmm_timer)) {
+ if (mod_timer(&cmm_timer, jiffies + cmm_timeout_seconds*HZ))
+ return;
+ }
+ cmm_timer.function = cmm_timer_fn;
+ cmm_timer.data = 0;
+ cmm_timer.expires = jiffies + cmm_timeout_seconds*HZ;
+ add_timer(&cmm_timer);
+}
+
+static void
+cmm_timer_fn(unsigned long ignored)
+{
+ long pages;
+
+ pages = cmm_timed_pages_target - cmm_timeout_pages;
+ if (pages < 0)
+ cmm_timed_pages_target = 0;
+ else
+ cmm_timed_pages_target = pages;
+ cmm_kick_thread();
+ cmm_set_timer();
+}
+
+void
+cmm_set_pages(long pages)
+{
+ cmm_pages_target = pages;
+ cmm_kick_thread();
+}
+
+long
+cmm_get_pages(void)
+{
+ return cmm_pages;
+}
+
+void
+cmm_add_timed_pages(long pages)
+{
+ cmm_timed_pages_target += pages;
+ cmm_kick_thread();
+}
+
+long
+cmm_get_timed_pages(void)
+{
+ return cmm_timed_pages;
+}
+
+void
+cmm_set_timeout(long pages, long seconds)
+{
+ cmm_timeout_pages = pages;
+ cmm_timeout_seconds = seconds;
+ cmm_set_timer();
+}
+
+static inline int
+cmm_skip_blanks(char *cp, char **endp)
+{
+ char *str;
+
+ for (str = cp; *str == ' ' || *str == '\t'; str++);
+ *endp = str;
+ return str != cp;
+}
+
+#ifdef CONFIG_CMM_PROC
+/* These will someday get removed. */
+#define VM_CMM_PAGES 1111
+#define VM_CMM_TIMED_PAGES 1112
+#define VM_CMM_TIMEOUT 1113
+
+static struct ctl_table cmm_table[];
+
+static int
+cmm_pages_handler(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ char buf[16], *p;
+ long pages;
+ int len;
+
+ if (!*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ len = *lenp;
+ if (copy_from_user(buf, buffer,
+ len > sizeof(buf) ? sizeof(buf) : len))
+ return -EFAULT;
+ buf[sizeof(buf) - 1] = '\0';
+ cmm_skip_blanks(buf, &p);
+ pages = cmm_strtoul(p, &p);
+ if (ctl == &cmm_table[0])
+ cmm_set_pages(pages);
+ else
+ cmm_add_timed_pages(pages);
+ } else {
+ if (ctl == &cmm_table[0])
+ pages = cmm_get_pages();
+ else
+ pages = cmm_get_timed_pages();
+ len = sprintf(buf, "%ld\n", pages);
+ if (len > *lenp)
+ len = *lenp;
+ if (copy_to_user(buffer, buf, len))
+ return -EFAULT;
+ }
+ *lenp = len;
+ *ppos += len;
+ return 0;
+}
+
+static int
+cmm_timeout_handler(ctl_table *ctl, int write, struct file *filp,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ char buf[64], *p;
+ long pages, seconds;
+ int len;
+
+ if (!*lenp || (*ppos && !write)) {
+ *lenp = 0;
+ return 0;
+ }
+
+ if (write) {
+ len = *lenp;
+ if (copy_from_user(buf, buffer,
+ len > sizeof(buf) ? sizeof(buf) : len))
+ return -EFAULT;
+ buf[sizeof(buf) - 1] = '\0';
+ cmm_skip_blanks(buf, &p);
+ pages = cmm_strtoul(p, &p);
+ cmm_skip_blanks(p, &p);
+ seconds = cmm_strtoul(p, &p);
+ cmm_set_timeout(pages, seconds);
+ } else {
+ len = sprintf(buf, "%ld %ld\n",
+ cmm_timeout_pages, cmm_timeout_seconds);
+ if (len > *lenp)
+ len = *lenp;
+ if (copy_to_user(buffer, buf, len))
+ return -EFAULT;
+ }
+ *lenp = len;
+ *ppos += len;
+ return 0;
+}
+
+static struct ctl_table cmm_table[] = {
+ {
+ .ctl_name = VM_CMM_PAGES,
+ .procname = "cmm_pages",
+ .mode = 0600,
+ .proc_handler = &cmm_pages_handler,
+ },
+ {
+ .ctl_name = VM_CMM_TIMED_PAGES,
+ .procname = "cmm_timed_pages",
+ .mode = 0600,
+ .proc_handler = &cmm_pages_handler,
+ },
+ {
+ .ctl_name = VM_CMM_TIMEOUT,
+ .procname = "cmm_timeout",
+ .mode = 0600,
+ .proc_handler = &cmm_timeout_handler,
+ },
+ { .ctl_name = 0 }
+};
+
+static struct ctl_table cmm_dir_table[] = {
+ {
+ .ctl_name = CTL_VM,
+ .procname = "vm",
+ .maxlen = 0,
+ .mode = 0555,
+ .child = cmm_table,
+ },
+ { .ctl_name = 0 }
+};
+#endif
+
+#ifdef CONFIG_CMM_IUCV
+#define SMSG_PREFIX "CMM"
+static void
+cmm_smsg_target(char *msg)
+{
+ long pages, seconds;
+
+ if (!cmm_skip_blanks(msg + strlen(SMSG_PREFIX), &msg))
+ return;
+ if (strncmp(msg, "SHRINK", 6) == 0) {
+ if (!cmm_skip_blanks(msg + 6, &msg))
+ return;
+ pages = cmm_strtoul(msg, &msg);
+ cmm_skip_blanks(msg, &msg);
+ if (*msg == '\0')
+ cmm_set_pages(pages);
+ } else if (strncmp(msg, "RELEASE", 7) == 0) {
+ if (!cmm_skip_blanks(msg + 7, &msg))
+ return;
+ pages = cmm_strtoul(msg, &msg);
+ cmm_skip_blanks(msg, &msg);
+ if (*msg == '\0')
+ cmm_add_timed_pages(pages);
+ } else if (strncmp(msg, "REUSE", 5) == 0) {
+ if (!cmm_skip_blanks(msg + 5, &msg))
+ return;
+ pages = cmm_strtoul(msg, &msg);
+ if (!cmm_skip_blanks(msg, &msg))
+ return;
+ seconds = cmm_strtoul(msg, &msg);
+ cmm_skip_blanks(msg, &msg);
+ if (*msg == '\0')
+ cmm_set_timeout(pages, seconds);
+ }
+}
+#endif
+
+struct ctl_table_header *cmm_sysctl_header;
+
+static int
+cmm_init (void)
+{
+#ifdef CONFIG_CMM_PROC
+ cmm_sysctl_header = register_sysctl_table(cmm_dir_table, 1);
+#endif
+#ifdef CONFIG_CMM_IUCV
+ smsg_register_callback(SMSG_PREFIX, cmm_smsg_target);
+#endif
+ INIT_WORK(&cmm_thread_starter, (void *) cmm_start_thread, 0);
+ init_waitqueue_head(&cmm_thread_wait);
+ init_timer(&cmm_timer);
+ return 0;
+}
+
+static void
+cmm_exit(void)
+{
+ cmm_free_pages(cmm_pages, &cmm_pages, &cmm_page_list);
+ cmm_free_pages(cmm_timed_pages, &cmm_timed_pages, &cmm_timed_page_list);
+#ifdef CONFIG_CMM_PROC
+ unregister_sysctl_table(cmm_sysctl_header);
+#endif
+#ifdef CONFIG_CMM_IUCV
+ smsg_unregister_callback(SMSG_PREFIX, cmm_smsg_target);
+#endif
+}
+
+module_init(cmm_init);
+module_exit(cmm_exit);
+
+EXPORT_SYMBOL(cmm_set_pages);
+EXPORT_SYMBOL(cmm_get_pages);
+EXPORT_SYMBOL(cmm_add_timed_pages);
+EXPORT_SYMBOL(cmm_get_timed_pages);
+EXPORT_SYMBOL(cmm_set_timeout);
+
+MODULE_LICENSE("GPL");
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c
new file mode 100644
index 00000000000..648deed17e2
--- /dev/null
+++ b/arch/s390/mm/extmem.c
@@ -0,0 +1,588 @@
+/*
+ * File...........: arch/s390/mm/extmem.c
+ * Author(s)......: Carsten Otte <cotte@de.ibm.com>
+ * Rob M van der Heij <rvdheij@nl.ibm.com>
+ * Steven Shultz <shultzss@us.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation 2002-2004
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/bootmem.h>
+#include <asm/page.h>
+#include <asm/ebcdic.h>
+#include <asm/errno.h>
+#include <asm/extmem.h>
+#include <asm/cpcmd.h>
+#include <linux/ctype.h>
+
+#define DCSS_DEBUG /* Debug messages on/off */
+
+#define DCSS_NAME "extmem"
+#ifdef DCSS_DEBUG
+#define PRINT_DEBUG(x...) printk(KERN_DEBUG DCSS_NAME " debug:" x)
+#else
+#define PRINT_DEBUG(x...) do {} while (0)
+#endif
+#define PRINT_INFO(x...) printk(KERN_INFO DCSS_NAME " info:" x)
+#define PRINT_WARN(x...) printk(KERN_WARNING DCSS_NAME " warning:" x)
+#define PRINT_ERR(x...) printk(KERN_ERR DCSS_NAME " error:" x)
+
+
+#define DCSS_LOADSHR 0x00
+#define DCSS_LOADNSR 0x04
+#define DCSS_PURGESEG 0x08
+#define DCSS_FINDSEG 0x0c
+#define DCSS_LOADNOLY 0x10
+#define DCSS_SEGEXT 0x18
+#define DCSS_FINDSEGA 0x0c
+
+struct qrange {
+ unsigned int start; // 3byte start address, 1 byte type
+ unsigned int end; // 3byte end address, 1 byte reserved
+};
+
+struct qout64 {
+ int segstart;
+ int segend;
+ int segcnt;
+ int segrcnt;
+ struct qrange range[6];
+};
+
+struct qin64 {
+ char qopcode;
+ char rsrv1[3];
+ char qrcode;
+ char rsrv2[3];
+ char qname[8];
+ unsigned int qoutptr;
+ short int qoutlen;
+};
+
+struct dcss_segment {
+ struct list_head list;
+ char dcss_name[8];
+ unsigned long start_addr;
+ unsigned long end;
+ atomic_t ref_count;
+ int do_nonshared;
+ unsigned int vm_segtype;
+ struct qrange range[6];
+ int segcnt;
+};
+
+static DEFINE_SPINLOCK(dcss_lock);
+static struct list_head dcss_list = LIST_HEAD_INIT(dcss_list);
+static char *segtype_string[] = { "SW", "EW", "SR", "ER", "SN", "EN", "SC",
+ "EW/EN-MIXED" };
+
+extern struct {
+ unsigned long addr, size, type;
+} memory_chunk[MEMORY_CHUNKS];
+
+/*
+ * Create the 8 bytes, ebcdic VM segment name from
+ * an ascii name.
+ */
+static void inline
+dcss_mkname(char *name, char *dcss_name)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ if (name[i] == '\0')
+ break;
+ dcss_name[i] = toupper(name[i]);
+ };
+ for (; i < 8; i++)
+ dcss_name[i] = ' ';
+ ASCEBC(dcss_name, 8);
+}
+
+
+/*
+ * search all segments in dcss_list, and return the one
+ * namend *name. If not found, return NULL.
+ */
+static struct dcss_segment *
+segment_by_name (char *name)
+{
+ char dcss_name[9];
+ struct list_head *l;
+ struct dcss_segment *tmp, *retval = NULL;
+
+ assert_spin_locked(&dcss_lock);
+ dcss_mkname (name, dcss_name);
+ list_for_each (l, &dcss_list) {
+ tmp = list_entry (l, struct dcss_segment, list);
+ if (memcmp(tmp->dcss_name, dcss_name, 8) == 0) {
+ retval = tmp;
+ break;
+ }
+ }
+ return retval;
+}
+
+
+/*
+ * Perform a function on a dcss segment.
+ */
+static inline int
+dcss_diag (__u8 func, void *parameter,
+ unsigned long *ret1, unsigned long *ret2)
+{
+ unsigned long rx, ry;
+ int rc;
+
+ rx = (unsigned long) parameter;
+ ry = (unsigned long) func;
+ __asm__ __volatile__(
+#ifdef CONFIG_ARCH_S390X
+ " sam31\n" // switch to 31 bit
+ " diag %0,%1,0x64\n"
+ " sam64\n" // switch back to 64 bit
+#else
+ " diag %0,%1,0x64\n"
+#endif
+ " ipm %2\n"
+ " srl %2,28\n"
+ : "+d" (rx), "+d" (ry), "=d" (rc) : : "cc" );
+ *ret1 = rx;
+ *ret2 = ry;
+ return rc;
+}
+
+static inline int
+dcss_diag_translate_rc (int vm_rc) {
+ if (vm_rc == 44)
+ return -ENOENT;
+ return -EIO;
+}
+
+
+/* do a diag to get info about a segment.
+ * fills start_address, end and vm_segtype fields
+ */
+static int
+query_segment_type (struct dcss_segment *seg)
+{
+ struct qin64 *qin = kmalloc (sizeof(struct qin64), GFP_DMA);
+ struct qout64 *qout = kmalloc (sizeof(struct qout64), GFP_DMA);
+
+ int diag_cc, rc, i;
+ unsigned long dummy, vmrc;
+
+ if ((qin == NULL) || (qout == NULL)) {
+ rc = -ENOMEM;
+ goto out_free;
+ }
+
+ /* initialize diag input parameters */
+ qin->qopcode = DCSS_FINDSEGA;
+ qin->qoutptr = (unsigned long) qout;
+ qin->qoutlen = sizeof(struct qout64);
+ memcpy (qin->qname, seg->dcss_name, 8);
+
+ diag_cc = dcss_diag (DCSS_SEGEXT, qin, &dummy, &vmrc);
+
+ if (diag_cc > 1) {
+ rc = dcss_diag_translate_rc (vmrc);
+ goto out_free;
+ }
+
+ if (qout->segcnt > 6) {
+ rc = -ENOTSUPP;
+ goto out_free;
+ }
+
+ if (qout->segcnt == 1) {
+ seg->vm_segtype = qout->range[0].start & 0xff;
+ } else {
+ /* multi-part segment. only one type supported here:
+ - all parts are contiguous
+ - all parts are either EW or EN type
+ - maximum 6 parts allowed */
+ unsigned long start = qout->segstart >> PAGE_SHIFT;
+ for (i=0; i<qout->segcnt; i++) {
+ if (((qout->range[i].start & 0xff) != SEG_TYPE_EW) &&
+ ((qout->range[i].start & 0xff) != SEG_TYPE_EN)) {
+ rc = -ENOTSUPP;
+ goto out_free;
+ }
+ if (start != qout->range[i].start >> PAGE_SHIFT) {
+ rc = -ENOTSUPP;
+ goto out_free;
+ }
+ start = (qout->range[i].end >> PAGE_SHIFT) + 1;
+ }
+ seg->vm_segtype = SEG_TYPE_EWEN;
+ }
+
+ /* analyze diag output and update seg */
+ seg->start_addr = qout->segstart;
+ seg->end = qout->segend;
+
+ memcpy (seg->range, qout->range, 6*sizeof(struct qrange));
+ seg->segcnt = qout->segcnt;
+
+ rc = 0;
+
+ out_free:
+ if (qin) kfree(qin);
+ if (qout) kfree(qout);
+ return rc;
+}
+
+/*
+ * check if the given segment collides with guest storage.
+ * returns 1 if this is the case, 0 if no collision was found
+ */
+static int
+segment_overlaps_storage(struct dcss_segment *seg)
+{
+ int i;
+
+ for (i=0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
+ if (memory_chunk[i].type != 0)
+ continue;
+ if ((memory_chunk[i].addr >> 20) > (seg->end >> 20))
+ continue;
+ if (((memory_chunk[i].addr + memory_chunk[i].size - 1) >> 20)
+ < (seg->start_addr >> 20))
+ continue;
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * check if segment collides with other segments that are currently loaded
+ * returns 1 if this is the case, 0 if no collision was found
+ */
+static int
+segment_overlaps_others (struct dcss_segment *seg)
+{
+ struct list_head *l;
+ struct dcss_segment *tmp;
+
+ assert_spin_locked(&dcss_lock);
+ list_for_each(l, &dcss_list) {
+ tmp = list_entry(l, struct dcss_segment, list);
+ if ((tmp->start_addr >> 20) > (seg->end >> 20))
+ continue;
+ if ((tmp->end >> 20) < (seg->start_addr >> 20))
+ continue;
+ if (seg == tmp)
+ continue;
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * check if segment exceeds the kernel mapping range (detected or set via mem=)
+ * returns 1 if this is the case, 0 if segment fits into the range
+ */
+static inline int
+segment_exceeds_range (struct dcss_segment *seg)
+{
+ int seg_last_pfn = (seg->end) >> PAGE_SHIFT;
+ if (seg_last_pfn > max_pfn)
+ return 1;
+ return 0;
+}
+
+/*
+ * get info about a segment
+ * possible return values:
+ * -ENOSYS : we are not running on VM
+ * -EIO : could not perform query diagnose
+ * -ENOENT : no such segment
+ * -ENOTSUPP: multi-part segment cannot be used with linux
+ * -ENOSPC : segment cannot be used (overlaps with storage)
+ * -ENOMEM : out of memory
+ * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
+ */
+int
+segment_type (char* name)
+{
+ int rc;
+ struct dcss_segment seg;
+
+ if (!MACHINE_IS_VM)
+ return -ENOSYS;
+
+ dcss_mkname(name, seg.dcss_name);
+ rc = query_segment_type (&seg);
+ if (rc < 0)
+ return rc;
+ return seg.vm_segtype;
+}
+
+/*
+ * real segment loading function, called from segment_load
+ */
+static int
+__segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long *end)
+{
+ struct dcss_segment *seg = kmalloc(sizeof(struct dcss_segment),
+ GFP_DMA);
+ int dcss_command, rc, diag_cc;
+
+ if (seg == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ dcss_mkname (name, seg->dcss_name);
+ rc = query_segment_type (seg);
+ if (rc < 0)
+ goto out_free;
+ if (segment_exceeds_range(seg)) {
+ PRINT_WARN ("segment_load: not loading segment %s - exceeds"
+ " kernel mapping range\n",name);
+ rc = -ERANGE;
+ goto out_free;
+ }
+ if (segment_overlaps_storage(seg)) {
+ PRINT_WARN ("segment_load: not loading segment %s - overlaps"
+ " storage\n",name);
+ rc = -ENOSPC;
+ goto out_free;
+ }
+ if (segment_overlaps_others(seg)) {
+ PRINT_WARN ("segment_load: not loading segment %s - overlaps"
+ " other segments\n",name);
+ rc = -EBUSY;
+ goto out_free;
+ }
+ if (do_nonshared)
+ dcss_command = DCSS_LOADNSR;
+ else
+ dcss_command = DCSS_LOADNOLY;
+
+ diag_cc = dcss_diag(dcss_command, seg->dcss_name,
+ &seg->start_addr, &seg->end);
+ if (diag_cc > 1) {
+ PRINT_WARN ("segment_load: could not load segment %s - "
+ "diag returned error (%ld)\n",name,seg->end);
+ rc = dcss_diag_translate_rc (seg->end);
+ dcss_diag(DCSS_PURGESEG, seg->dcss_name,
+ &seg->start_addr, &seg->end);
+ goto out_free;
+ }
+ seg->do_nonshared = do_nonshared;
+ atomic_set(&seg->ref_count, 1);
+ list_add(&seg->list, &dcss_list);
+ rc = seg->vm_segtype;
+ *addr = seg->start_addr;
+ *end = seg->end;
+ if (do_nonshared)
+ PRINT_INFO ("segment_load: loaded segment %s range %p .. %p "
+ "type %s in non-shared mode\n", name,
+ (void*)seg->start_addr, (void*)seg->end,
+ segtype_string[seg->vm_segtype]);
+ else
+ PRINT_INFO ("segment_load: loaded segment %s range %p .. %p "
+ "type %s in shared mode\n", name,
+ (void*)seg->start_addr, (void*)seg->end,
+ segtype_string[seg->vm_segtype]);
+ goto out;
+ out_free:
+ kfree (seg);
+ out:
+ return rc;
+}
+
+/*
+ * this function loads a DCSS segment
+ * name : name of the DCSS
+ * do_nonshared : 0 indicates that the dcss should be shared with other linux images
+ * 1 indicates that the dcss should be exclusive for this linux image
+ * addr : will be filled with start address of the segment
+ * end : will be filled with end address of the segment
+ * return values:
+ * -ENOSYS : we are not running on VM
+ * -EIO : could not perform query or load diagnose
+ * -ENOENT : no such segment
+ * -ENOTSUPP: multi-part segment cannot be used with linux
+ * -ENOSPC : segment cannot be used (overlaps with storage)
+ * -EBUSY : segment can temporarily not be used (overlaps with dcss)
+ * -ERANGE : segment cannot be used (exceeds kernel mapping range)
+ * -EPERM : segment is currently loaded with incompatible permissions
+ * -ENOMEM : out of memory
+ * 0 .. 6 : type of segment as defined in include/asm-s390/extmem.h
+ */
+int
+segment_load (char *name, int do_nonshared, unsigned long *addr,
+ unsigned long *end)
+{
+ struct dcss_segment *seg;
+ int rc;
+
+ if (!MACHINE_IS_VM)
+ return -ENOSYS;
+
+ spin_lock (&dcss_lock);
+ seg = segment_by_name (name);
+ if (seg == NULL)
+ rc = __segment_load (name, do_nonshared, addr, end);
+ else {
+ if (do_nonshared == seg->do_nonshared) {
+ atomic_inc(&seg->ref_count);
+ *addr = seg->start_addr;
+ *end = seg->end;
+ rc = seg->vm_segtype;
+ } else {
+ *addr = *end = 0;
+ rc = -EPERM;
+ }
+ }
+ spin_unlock (&dcss_lock);
+ return rc;
+}
+
+/*
+ * this function modifies the shared state of a DCSS segment. note that
+ * name : name of the DCSS
+ * do_nonshared : 0 indicates that the dcss should be shared with other linux images
+ * 1 indicates that the dcss should be exclusive for this linux image
+ * return values:
+ * -EIO : could not perform load diagnose (segment gone!)
+ * -ENOENT : no such segment (segment gone!)
+ * -EAGAIN : segment is in use by other exploiters, try later
+ * -EINVAL : no segment with the given name is currently loaded - name invalid
+ * 0 : operation succeeded
+ */
+int
+segment_modify_shared (char *name, int do_nonshared)
+{
+ struct dcss_segment *seg;
+ unsigned long dummy;
+ int dcss_command, rc, diag_cc;
+
+ spin_lock (&dcss_lock);
+ seg = segment_by_name (name);
+ if (seg == NULL) {
+ rc = -EINVAL;
+ goto out_unlock;
+ }
+ if (do_nonshared == seg->do_nonshared) {
+ PRINT_INFO ("segment_modify_shared: not reloading segment %s"
+ " - already in requested mode\n",name);
+ rc = 0;
+ goto out_unlock;
+ }
+ if (atomic_read (&seg->ref_count) != 1) {
+ PRINT_WARN ("segment_modify_shared: not reloading segment %s - "
+ "segment is in use by other driver(s)\n",name);
+ rc = -EAGAIN;
+ goto out_unlock;
+ }
+ dcss_diag(DCSS_PURGESEG, seg->dcss_name,
+ &dummy, &dummy);
+ if (do_nonshared)
+ dcss_command = DCSS_LOADNSR;
+ else
+ dcss_command = DCSS_LOADNOLY;
+ diag_cc = dcss_diag(dcss_command, seg->dcss_name,
+ &seg->start_addr, &seg->end);
+ if (diag_cc > 1) {
+ PRINT_WARN ("segment_modify_shared: could not reload segment %s"
+ " - diag returned error (%ld)\n",name,seg->end);
+ rc = dcss_diag_translate_rc (seg->end);
+ goto out_del;
+ }
+ seg->do_nonshared = do_nonshared;
+ rc = 0;
+ goto out_unlock;
+ out_del:
+ list_del(&seg->list);
+ dcss_diag(DCSS_PURGESEG, seg->dcss_name,
+ &dummy, &dummy);
+ kfree (seg);
+ out_unlock:
+ spin_unlock(&dcss_lock);
+ return rc;
+}
+
+/*
+ * Decrease the use count of a DCSS segment and remove
+ * it from the address space if nobody is using it
+ * any longer.
+ */
+void
+segment_unload(char *name)
+{
+ unsigned long dummy;
+ struct dcss_segment *seg;
+
+ if (!MACHINE_IS_VM)
+ return;
+
+ spin_lock(&dcss_lock);
+ seg = segment_by_name (name);
+ if (seg == NULL) {
+ PRINT_ERR ("could not find segment %s in segment_unload, "
+ "please report to linux390@de.ibm.com\n",name);
+ goto out_unlock;
+ }
+ if (atomic_dec_return(&seg->ref_count) == 0) {
+ list_del(&seg->list);
+ dcss_diag(DCSS_PURGESEG, seg->dcss_name,
+ &dummy, &dummy);
+ kfree(seg);
+ }
+out_unlock:
+ spin_unlock(&dcss_lock);
+}
+
+/*
+ * save segment content permanently
+ */
+void
+segment_save(char *name)
+{
+ struct dcss_segment *seg;
+ int startpfn = 0;
+ int endpfn = 0;
+ char cmd1[160];
+ char cmd2[80];
+ int i;
+
+ if (!MACHINE_IS_VM)
+ return;
+
+ spin_lock(&dcss_lock);
+ seg = segment_by_name (name);
+
+ if (seg == NULL) {
+ PRINT_ERR ("could not find segment %s in segment_save, please report to linux390@de.ibm.com\n",name);
+ return;
+ }
+
+ startpfn = seg->start_addr >> PAGE_SHIFT;
+ endpfn = (seg->end) >> PAGE_SHIFT;
+ sprintf(cmd1, "DEFSEG %s", name);
+ for (i=0; i<seg->segcnt; i++) {
+ sprintf(cmd1+strlen(cmd1), " %X-%X %s",
+ seg->range[i].start >> PAGE_SHIFT,
+ seg->range[i].end >> PAGE_SHIFT,
+ segtype_string[seg->range[i].start & 0xff]);
+ }
+ sprintf(cmd2, "SAVESEG %s", name);
+ cpcmd(cmd1, NULL, 0);
+ cpcmd(cmd2, NULL, 0);
+ spin_unlock(&dcss_lock);
+}
+
+EXPORT_SYMBOL(segment_load);
+EXPORT_SYMBOL(segment_unload);
+EXPORT_SYMBOL(segment_save);
+EXPORT_SYMBOL(segment_type);
+EXPORT_SYMBOL(segment_modify_shared);
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
new file mode 100644
index 00000000000..80306bc8c79
--- /dev/null
+++ b/arch/s390/mm/fault.c
@@ -0,0 +1,586 @@
+/*
+ * arch/s390/mm/fault.c
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Hartmut Penner (hp@de.ibm.com)
+ * Ulrich Weigand (uweigand@de.ibm.com)
+ *
+ * Derived from "arch/i386/mm/fault.c"
+ * Copyright (C) 1995 Linus Torvalds
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/module.h>
+#include <linux/hardirq.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+
+#ifndef CONFIG_ARCH_S390X
+#define __FAIL_ADDR_MASK 0x7ffff000
+#define __FIXUP_MASK 0x7fffffff
+#define __SUBCODE_MASK 0x0200
+#define __PF_RES_FIELD 0ULL
+#else /* CONFIG_ARCH_S390X */
+#define __FAIL_ADDR_MASK -4096L
+#define __FIXUP_MASK ~0L
+#define __SUBCODE_MASK 0x0600
+#define __PF_RES_FIELD 0x8000000000000000ULL
+#endif /* CONFIG_ARCH_S390X */
+
+#ifdef CONFIG_SYSCTL
+extern int sysctl_userprocess_debug;
+#endif
+
+extern void die(const char *,struct pt_regs *,long);
+
+extern spinlock_t timerlist_lock;
+
+/*
+ * Unlock any spinlocks which will prevent us from getting the
+ * message out (timerlist_lock is acquired through the
+ * console unblank code)
+ */
+void bust_spinlocks(int yes)
+{
+ if (yes) {
+ oops_in_progress = 1;
+ } else {
+ int loglevel_save = console_loglevel;
+ console_unblank();
+ oops_in_progress = 0;
+ /*
+ * OK, the message is on the console. Now we call printk()
+ * without oops_in_progress set so that printk will give klogd
+ * a poke. Hold onto your hats...
+ */
+ console_loglevel = 15;
+ printk(" ");
+ console_loglevel = loglevel_save;
+ }
+}
+
+/*
+ * Check which address space is addressed by the access
+ * register in S390_lowcore.exc_access_id.
+ * Returns 1 for user space and 0 for kernel space.
+ */
+static int __check_access_register(struct pt_regs *regs, int error_code)
+{
+ int areg = S390_lowcore.exc_access_id;
+
+ if (areg == 0)
+ /* Access via access register 0 -> kernel address */
+ return 0;
+ save_access_regs(current->thread.acrs);
+ if (regs && areg < NUM_ACRS && current->thread.acrs[areg] <= 1)
+ /*
+ * access register contains 0 -> kernel address,
+ * access register contains 1 -> user space address
+ */
+ return current->thread.acrs[areg];
+
+ /* Something unhealthy was done with the access registers... */
+ die("page fault via unknown access register", regs, error_code);
+ do_exit(SIGKILL);
+ return 0;
+}
+
+/*
+ * Check which address space the address belongs to.
+ * Returns 1 for user space and 0 for kernel space.
+ */
+static inline int check_user_space(struct pt_regs *regs, int error_code)
+{
+ /*
+ * The lowest two bits of S390_lowcore.trans_exc_code indicate
+ * which paging table was used:
+ * 0: Primary Segment Table Descriptor
+ * 1: STD determined via access register
+ * 2: Secondary Segment Table Descriptor
+ * 3: Home Segment Table Descriptor
+ */
+ int descriptor = S390_lowcore.trans_exc_code & 3;
+ if (unlikely(descriptor == 1))
+ return __check_access_register(regs, error_code);
+ if (descriptor == 2)
+ return current->thread.mm_segment.ar4;
+ return descriptor != 0;
+}
+
+/*
+ * Send SIGSEGV to task. This is an external routine
+ * to keep the stack usage of do_page_fault small.
+ */
+static void do_sigsegv(struct pt_regs *regs, unsigned long error_code,
+ int si_code, unsigned long address)
+{
+ struct siginfo si;
+
+#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
+#if defined(CONFIG_SYSCTL)
+ if (sysctl_userprocess_debug)
+#endif
+ {
+ printk("User process fault: interruption code 0x%lX\n",
+ error_code);
+ printk("failing address: %lX\n", address);
+ show_regs(regs);
+ }
+#endif
+ si.si_signo = SIGSEGV;
+ si.si_code = si_code;
+ si.si_addr = (void *) address;
+ force_sig_info(SIGSEGV, &si, current);
+}
+
+/*
+ * This routine handles page faults. It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ *
+ * error_code:
+ * 04 Protection -> Write-Protection (suprression)
+ * 10 Segment translation -> Not present (nullification)
+ * 11 Page translation -> Not present (nullification)
+ * 3b Region third trans. -> Not present (nullification)
+ */
+extern inline void
+do_exception(struct pt_regs *regs, unsigned long error_code, int is_protection)
+{
+ struct task_struct *tsk;
+ struct mm_struct *mm;
+ struct vm_area_struct * vma;
+ unsigned long address;
+ int user_address;
+ const struct exception_table_entry *fixup;
+ int si_code = SEGV_MAPERR;
+
+ tsk = current;
+ mm = tsk->mm;
+
+ /*
+ * Check for low-address protection. This needs to be treated
+ * as a special case because the translation exception code
+ * field is not guaranteed to contain valid data in this case.
+ */
+ if (is_protection && !(S390_lowcore.trans_exc_code & 4)) {
+
+ /* Low-address protection hit in kernel mode means
+ NULL pointer write access in kernel mode. */
+ if (!(regs->psw.mask & PSW_MASK_PSTATE)) {
+ address = 0;
+ user_address = 0;
+ goto no_context;
+ }
+
+ /* Low-address protection hit in user mode 'cannot happen'. */
+ die ("Low-address protection", regs, error_code);
+ do_exit(SIGKILL);
+ }
+
+ /*
+ * get the failing address
+ * more specific the segment and page table portion of
+ * the address
+ */
+ address = S390_lowcore.trans_exc_code & __FAIL_ADDR_MASK;
+ user_address = check_user_space(regs, error_code);
+
+ /*
+ * Verify that the fault happened in user space, that
+ * we are not in an interrupt and that there is a
+ * user context.
+ */
+ if (user_address == 0 || in_interrupt() || !mm)
+ goto no_context;
+
+ /*
+ * When we get here, the fault happened in the current
+ * task's user address space, so we can switch on the
+ * interrupts again and then search the VMAs
+ */
+ local_irq_enable();
+
+ down_read(&mm->mmap_sem);
+
+ vma = find_vma(mm, address);
+ if (!vma)
+ goto bad_area;
+ if (vma->vm_start <= address)
+ goto good_area;
+ if (!(vma->vm_flags & VM_GROWSDOWN))
+ goto bad_area;
+ if (expand_stack(vma, address))
+ goto bad_area;
+/*
+ * Ok, we have a good vm_area for this memory access, so
+ * we can handle it..
+ */
+good_area:
+ si_code = SEGV_ACCERR;
+ if (!is_protection) {
+ /* page not present, check vm flags */
+ if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
+ goto bad_area;
+ } else {
+ if (!(vma->vm_flags & VM_WRITE))
+ goto bad_area;
+ }
+
+survive:
+ /*
+ * If for any reason at all we couldn't handle the fault,
+ * make sure we exit gracefully rather than endlessly redo
+ * the fault.
+ */
+ switch (handle_mm_fault(mm, vma, address, is_protection)) {
+ case VM_FAULT_MINOR:
+ tsk->min_flt++;
+ break;
+ case VM_FAULT_MAJOR:
+ tsk->maj_flt++;
+ break;
+ case VM_FAULT_SIGBUS:
+ goto do_sigbus;
+ case VM_FAULT_OOM:
+ goto out_of_memory;
+ default:
+ BUG();
+ }
+
+ up_read(&mm->mmap_sem);
+ /*
+ * The instruction that caused the program check will
+ * be repeated. Don't signal single step via SIGTRAP.
+ */
+ clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
+ return;
+
+/*
+ * Something tried to access memory that isn't in our memory map..
+ * Fix it, but check if it's kernel or user first..
+ */
+bad_area:
+ up_read(&mm->mmap_sem);
+
+ /* User mode accesses just cause a SIGSEGV */
+ if (regs->psw.mask & PSW_MASK_PSTATE) {
+ tsk->thread.prot_addr = address;
+ tsk->thread.trap_no = error_code;
+ do_sigsegv(regs, error_code, si_code, address);
+ return;
+ }
+
+no_context:
+ /* Are we prepared to handle this kernel fault? */
+ fixup = search_exception_tables(regs->psw.addr & __FIXUP_MASK);
+ if (fixup) {
+ regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
+ return;
+ }
+
+/*
+ * Oops. The kernel tried to access some bad page. We'll have to
+ * terminate things with extreme prejudice.
+ */
+ if (user_address == 0)
+ printk(KERN_ALERT "Unable to handle kernel pointer dereference"
+ " at virtual kernel address %p\n", (void *)address);
+ else
+ printk(KERN_ALERT "Unable to handle kernel paging request"
+ " at virtual user address %p\n", (void *)address);
+
+ die("Oops", regs, error_code);
+ do_exit(SIGKILL);
+
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+*/
+out_of_memory:
+ up_read(&mm->mmap_sem);
+ if (tsk->pid == 1) {
+ yield();
+ goto survive;
+ }
+ printk("VM: killing process %s\n", tsk->comm);
+ if (regs->psw.mask & PSW_MASK_PSTATE)
+ do_exit(SIGKILL);
+ goto no_context;
+
+do_sigbus:
+ up_read(&mm->mmap_sem);
+
+ /*
+ * Send a sigbus, regardless of whether we were in kernel
+ * or user mode.
+ */
+ tsk->thread.prot_addr = address;
+ tsk->thread.trap_no = error_code;
+ force_sig(SIGBUS, tsk);
+
+ /* Kernel mode? Handle exceptions or die */
+ if (!(regs->psw.mask & PSW_MASK_PSTATE))
+ goto no_context;
+}
+
+void do_protection_exception(struct pt_regs *regs, unsigned long error_code)
+{
+ regs->psw.addr -= (error_code >> 16);
+ do_exception(regs, 4, 1);
+}
+
+void do_dat_exception(struct pt_regs *regs, unsigned long error_code)
+{
+ do_exception(regs, error_code & 0xff, 0);
+}
+
+#ifndef CONFIG_ARCH_S390X
+
+typedef struct _pseudo_wait_t {
+ struct _pseudo_wait_t *next;
+ wait_queue_head_t queue;
+ unsigned long address;
+ int resolved;
+} pseudo_wait_t;
+
+static pseudo_wait_t *pseudo_lock_queue = NULL;
+static spinlock_t pseudo_wait_spinlock; /* spinlock to protect lock queue */
+
+/*
+ * This routine handles 'pagex' pseudo page faults.
+ */
+asmlinkage void
+do_pseudo_page_fault(struct pt_regs *regs, unsigned long error_code)
+{
+ pseudo_wait_t wait_struct;
+ pseudo_wait_t *ptr, *last, *next;
+ unsigned long address;
+
+ /*
+ * get the failing address
+ * more specific the segment and page table portion of
+ * the address
+ */
+ address = S390_lowcore.trans_exc_code & 0xfffff000;
+
+ if (address & 0x80000000) {
+ /* high bit set -> a page has been swapped in by VM */
+ address &= 0x7fffffff;
+ spin_lock(&pseudo_wait_spinlock);
+ last = NULL;
+ ptr = pseudo_lock_queue;
+ while (ptr != NULL) {
+ next = ptr->next;
+ if (address == ptr->address) {
+ /*
+ * This is one of the processes waiting
+ * for the page. Unchain from the queue.
+ * There can be more than one process
+ * waiting for the same page. VM presents
+ * an initial and a completion interrupt for
+ * every process that tries to access a
+ * page swapped out by VM.
+ */
+ if (last == NULL)
+ pseudo_lock_queue = next;
+ else
+ last->next = next;
+ /* now wake up the process */
+ ptr->resolved = 1;
+ wake_up(&ptr->queue);
+ } else
+ last = ptr;
+ ptr = next;
+ }
+ spin_unlock(&pseudo_wait_spinlock);
+ } else {
+ /* Pseudo page faults in kernel mode is a bad idea */
+ if (!(regs->psw.mask & PSW_MASK_PSTATE)) {
+ /*
+ * VM presents pseudo page faults if the interrupted
+ * state was not disabled for interrupts. So we can
+ * get pseudo page fault interrupts while running
+ * in kernel mode. We simply access the page here
+ * while we are running disabled. VM will then swap
+ * in the page synchronously.
+ */
+ if (check_user_space(regs, error_code) == 0)
+ /* dereference a virtual kernel address */
+ __asm__ __volatile__ (
+ " ic 0,0(%0)"
+ : : "a" (address) : "0");
+ else
+ /* dereference a virtual user address */
+ __asm__ __volatile__ (
+ " la 2,0(%0)\n"
+ " sacf 512\n"
+ " ic 2,0(2)\n"
+ "0:sacf 0\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b,0b\n"
+ ".previous"
+ : : "a" (address) : "2" );
+
+ return;
+ }
+ /* initialize and add element to pseudo_lock_queue */
+ init_waitqueue_head (&wait_struct.queue);
+ wait_struct.address = address;
+ wait_struct.resolved = 0;
+ spin_lock(&pseudo_wait_spinlock);
+ wait_struct.next = pseudo_lock_queue;
+ pseudo_lock_queue = &wait_struct;
+ spin_unlock(&pseudo_wait_spinlock);
+ /*
+ * The instruction that caused the program check will
+ * be repeated. Don't signal single step via SIGTRAP.
+ */
+ clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
+ /* go to sleep */
+ wait_event(wait_struct.queue, wait_struct.resolved);
+ }
+}
+#endif /* CONFIG_ARCH_S390X */
+
+#ifdef CONFIG_PFAULT
+/*
+ * 'pfault' pseudo page faults routines.
+ */
+static int pfault_disable = 0;
+
+static int __init nopfault(char *str)
+{
+ pfault_disable = 1;
+ return 1;
+}
+
+__setup("nopfault", nopfault);
+
+typedef struct {
+ __u16 refdiagc;
+ __u16 reffcode;
+ __u16 refdwlen;
+ __u16 refversn;
+ __u64 refgaddr;
+ __u64 refselmk;
+ __u64 refcmpmk;
+ __u64 reserved;
+} __attribute__ ((packed)) pfault_refbk_t;
+
+int pfault_init(void)
+{
+ pfault_refbk_t refbk =
+ { 0x258, 0, 5, 2, __LC_CURRENT, 1ULL << 48, 1ULL << 48,
+ __PF_RES_FIELD };
+ int rc;
+
+ if (pfault_disable)
+ return -1;
+ __asm__ __volatile__(
+ " diag %1,%0,0x258\n"
+ "0: j 2f\n"
+ "1: la %0,8\n"
+ "2:\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+#ifndef CONFIG_ARCH_S390X
+ " .long 0b,1b\n"
+#else /* CONFIG_ARCH_S390X */
+ " .quad 0b,1b\n"
+#endif /* CONFIG_ARCH_S390X */
+ ".previous"
+ : "=d" (rc) : "a" (&refbk) : "cc" );
+ __ctl_set_bit(0, 9);
+ return rc;
+}
+
+void pfault_fini(void)
+{
+ pfault_refbk_t refbk =
+ { 0x258, 1, 5, 2, 0ULL, 0ULL, 0ULL, 0ULL };
+
+ if (pfault_disable)
+ return;
+ __ctl_clear_bit(0,9);
+ __asm__ __volatile__(
+ " diag %0,0,0x258\n"
+ "0:\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+#ifndef CONFIG_ARCH_S390X
+ " .long 0b,0b\n"
+#else /* CONFIG_ARCH_S390X */
+ " .quad 0b,0b\n"
+#endif /* CONFIG_ARCH_S390X */
+ ".previous"
+ : : "a" (&refbk) : "cc" );
+}
+
+asmlinkage void
+pfault_interrupt(struct pt_regs *regs, __u16 error_code)
+{
+ struct task_struct *tsk;
+ __u16 subcode;
+
+ /*
+ * Get the external interruption subcode & pfault
+ * initial/completion signal bit. VM stores this
+ * in the 'cpu address' field associated with the
+ * external interrupt.
+ */
+ subcode = S390_lowcore.cpu_addr;
+ if ((subcode & 0xff00) != __SUBCODE_MASK)
+ return;
+
+ /*
+ * Get the token (= address of the task structure of the affected task).
+ */
+ tsk = *(struct task_struct **) __LC_PFAULT_INTPARM;
+
+ if (subcode & 0x0080) {
+ /* signal bit is set -> a page has been swapped in by VM */
+ if (xchg(&tsk->thread.pfault_wait, -1) != 0) {
+ /* Initial interrupt was faster than the completion
+ * interrupt. pfault_wait is valid. Set pfault_wait
+ * back to zero and wake up the process. This can
+ * safely be done because the task is still sleeping
+ * and can't procude new pfaults. */
+ tsk->thread.pfault_wait = 0;
+ wake_up_process(tsk);
+ }
+ } else {
+ /* signal bit not set -> a real page is missing. */
+ set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+ if (xchg(&tsk->thread.pfault_wait, 1) != 0) {
+ /* Completion interrupt was faster than the initial
+ * interrupt (swapped in a -1 for pfault_wait). Set
+ * pfault_wait back to zero and exit. This can be
+ * done safely because tsk is running in kernel
+ * mode and can't produce new pfaults. */
+ tsk->thread.pfault_wait = 0;
+ set_task_state(tsk, TASK_RUNNING);
+ } else
+ set_tsk_need_resched(tsk);
+ }
+}
+#endif
+
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
new file mode 100644
index 00000000000..8e723bc7f79
--- /dev/null
+++ b/arch/s390/mm/init.c
@@ -0,0 +1,310 @@
+/*
+ * arch/s390/mm/init.c
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Hartmut Penner (hp@de.ibm.com)
+ *
+ * Derived from "arch/i386/mm/init.c"
+ * Copyright (C) 1995 Linus Torvalds
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/dma.h>
+#include <asm/lowcore.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
+char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
+
+void diag10(unsigned long addr)
+{
+ if (addr >= 0x7ff00000)
+ return;
+#ifdef __s390x__
+ asm volatile (
+ " sam31\n"
+ " diag %0,%0,0x10\n"
+ "0: sam64\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 8\n"
+ " .quad 0b, 0b\n"
+ ".previous\n"
+ : : "a" (addr));
+#else
+ asm volatile (
+ " diag %0,%0,0x10\n"
+ "0:\n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4\n"
+ " .long 0b, 0b\n"
+ ".previous\n"
+ : : "a" (addr));
+#endif
+}
+
+void show_mem(void)
+{
+ int i, total = 0, reserved = 0;
+ int shared = 0, cached = 0;
+
+ printk("Mem-info:\n");
+ show_free_areas();
+ printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+ i = max_mapnr;
+ while (i-- > 0) {
+ total++;
+ if (PageReserved(mem_map+i))
+ reserved++;
+ else if (PageSwapCache(mem_map+i))
+ cached++;
+ else if (page_count(mem_map+i))
+ shared += page_count(mem_map+i) - 1;
+ }
+ printk("%d pages of RAM\n",total);
+ printk("%d reserved pages\n",reserved);
+ printk("%d pages shared\n",shared);
+ printk("%d pages swap cached\n",cached);
+}
+
+/* References to section boundaries */
+
+extern unsigned long _text;
+extern unsigned long _etext;
+extern unsigned long _edata;
+extern unsigned long __bss_start;
+extern unsigned long _end;
+
+extern unsigned long __init_begin;
+extern unsigned long __init_end;
+
+/*
+ * paging_init() sets up the page tables
+ */
+
+#ifndef CONFIG_ARCH_S390X
+void __init paging_init(void)
+{
+ pgd_t * pg_dir;
+ pte_t * pg_table;
+ pte_t pte;
+ int i;
+ unsigned long tmp;
+ unsigned long pfn = 0;
+ unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
+ static const int ssm_mask = 0x04000000L;
+
+ /* unmap whole virtual address space */
+
+ pg_dir = swapper_pg_dir;
+
+ for (i=0;i<KERNEL_PGD_PTRS;i++)
+ pmd_clear((pmd_t*)pg_dir++);
+
+ /*
+ * map whole physical memory to virtual memory (identity mapping)
+ */
+
+ pg_dir = swapper_pg_dir;
+
+ while (pfn < max_low_pfn) {
+ /*
+ * pg_table is physical at this point
+ */
+ pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+
+ pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table));
+ pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024));
+ pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048));
+ pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072));
+ pg_dir++;
+
+ for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
+ pte = pfn_pte(pfn, PAGE_KERNEL);
+ if (pfn >= max_low_pfn)
+ pte_clear(&init_mm, 0, &pte);
+ set_pte(pg_table, pte);
+ pfn++;
+ }
+ }
+
+ S390_lowcore.kernel_asce = pgdir_k;
+
+ /* enable virtual mapping in kernel mode */
+ __asm__ __volatile__(" LCTL 1,1,%0\n"
+ " LCTL 7,7,%0\n"
+ " LCTL 13,13,%0\n"
+ " SSM %1"
+ : : "m" (pgdir_k), "m" (ssm_mask));
+
+ local_flush_tlb();
+
+ {
+ unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0};
+
+ zones_size[ZONE_DMA] = max_low_pfn;
+ free_area_init(zones_size);
+ }
+ return;
+}
+
+#else /* CONFIG_ARCH_S390X */
+void __init paging_init(void)
+{
+ pgd_t * pg_dir;
+ pmd_t * pm_dir;
+ pte_t * pt_dir;
+ pte_t pte;
+ int i,j,k;
+ unsigned long pfn = 0;
+ unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
+ _KERN_REGION_TABLE;
+ static const int ssm_mask = 0x04000000L;
+
+ unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+ unsigned long dma_pfn, high_pfn;
+
+ dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
+ high_pfn = max_low_pfn;
+
+ if (dma_pfn > high_pfn)
+ zones_size[ZONE_DMA] = high_pfn;
+ else {
+ zones_size[ZONE_DMA] = dma_pfn;
+ zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
+ }
+
+ /* Initialize mem_map[]. */
+ free_area_init(zones_size);
+
+
+ /*
+ * map whole physical memory to virtual memory (identity mapping)
+ */
+
+ pg_dir = swapper_pg_dir;
+
+ for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) {
+
+ if (pfn >= max_low_pfn) {
+ pgd_clear(pg_dir);
+ continue;
+ }
+
+ pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4);
+ pgd_populate(&init_mm, pg_dir, pm_dir);
+
+ for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
+ if (pfn >= max_low_pfn) {
+ pmd_clear(pm_dir);
+ continue;
+ }
+
+ pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
+
+ for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
+ pte = pfn_pte(pfn, PAGE_KERNEL);
+ if (pfn >= max_low_pfn) {
+ pte_clear(&init_mm, 0, &pte);
+ continue;
+ }
+ set_pte(pt_dir, pte);
+ pfn++;
+ }
+ }
+ }
+
+ S390_lowcore.kernel_asce = pgdir_k;
+
+ /* enable virtual mapping in kernel mode */
+ __asm__ __volatile__("lctlg 1,1,%0\n\t"
+ "lctlg 7,7,%0\n\t"
+ "lctlg 13,13,%0\n\t"
+ "ssm %1"
+ : :"m" (pgdir_k), "m" (ssm_mask));
+
+ local_flush_tlb();
+
+ return;
+}
+#endif /* CONFIG_ARCH_S390X */
+
+void __init mem_init(void)
+{
+ unsigned long codesize, reservedpages, datasize, initsize;
+
+ max_mapnr = num_physpages = max_low_pfn;
+ high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+
+ /* clear the zero-page */
+ memset(empty_zero_page, 0, PAGE_SIZE);
+
+ /* this will put all low memory onto the freelists */
+ totalram_pages += free_all_bootmem();
+
+ reservedpages = 0;
+
+ codesize = (unsigned long) &_etext - (unsigned long) &_text;
+ datasize = (unsigned long) &_edata - (unsigned long) &_etext;
+ initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
+ printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
+ (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+ max_mapnr << (PAGE_SHIFT-10),
+ codesize >> 10,
+ reservedpages << (PAGE_SHIFT-10),
+ datasize >>10,
+ initsize >> 10);
+}
+
+void free_initmem(void)
+{
+ unsigned long addr;
+
+ addr = (unsigned long)(&__init_begin);
+ for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ set_page_count(virt_to_page(addr), 1);
+ free_page(addr);
+ totalram_pages++;
+ }
+ printk ("Freeing unused kernel memory: %ldk freed\n",
+ ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+ if (start < end)
+ printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+ for (; start < end; start += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(start));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ totalram_pages++;
+ }
+}
+#endif
diff --git a/arch/s390/mm/ioremap.c b/arch/s390/mm/ioremap.c
new file mode 100644
index 00000000000..c6c39d868bc
--- /dev/null
+++ b/arch/s390/mm/ioremap.c
@@ -0,0 +1,138 @@
+/*
+ * arch/s390/mm/ioremap.c
+ *
+ * S390 version
+ * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Hartmut Penner (hp@de.ibm.com)
+ *
+ * Derived from "arch/i386/mm/extable.c"
+ * (C) Copyright 1995 1996 Linus Torvalds
+ *
+ * Re-map IO memory to kernel address space so that we can access it.
+ * This is needed for high PCI addresses that aren't mapped in the
+ * 640k-1MB IO memory area on PC's
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <asm/pgalloc.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+
+static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
+ unsigned long phys_addr, unsigned long flags)
+{
+ unsigned long end;
+ unsigned long pfn;
+
+ address &= ~PMD_MASK;
+ end = address + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+ if (address >= end)
+ BUG();
+ pfn = phys_addr >> PAGE_SHIFT;
+ do {
+ if (!pte_none(*pte)) {
+ printk("remap_area_pte: page already exists\n");
+ BUG();
+ }
+ set_pte(pte, pfn_pte(pfn, __pgprot(flags)));
+ address += PAGE_SIZE;
+ pfn++;
+ pte++;
+ } while (address && (address < end));
+}
+
+static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
+ unsigned long phys_addr, unsigned long flags)
+{
+ unsigned long end;
+
+ address &= ~PGDIR_MASK;
+ end = address + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+ phys_addr -= address;
+ if (address >= end)
+ BUG();
+ do {
+ pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
+ if (!pte)
+ return -ENOMEM;
+ remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+ address = (address + PMD_SIZE) & PMD_MASK;
+ pmd++;
+ } while (address && (address < end));
+ return 0;
+}
+
+static int remap_area_pages(unsigned long address, unsigned long phys_addr,
+ unsigned long size, unsigned long flags)
+{
+ int error;
+ pgd_t * dir;
+ unsigned long end = address + size;
+
+ phys_addr -= address;
+ dir = pgd_offset(&init_mm, address);
+ flush_cache_all();
+ if (address >= end)
+ BUG();
+ spin_lock(&init_mm.page_table_lock);
+ do {
+ pmd_t *pmd;
+ pmd = pmd_alloc(&init_mm, dir, address);
+ error = -ENOMEM;
+ if (!pmd)
+ break;
+ if (remap_area_pmd(pmd, address, end - address,
+ phys_addr + address, flags))
+ break;
+ error = 0;
+ address = (address + PGDIR_SIZE) & PGDIR_MASK;
+ dir++;
+ } while (address && (address < end));
+ spin_unlock(&init_mm.page_table_lock);
+ flush_tlb_all();
+ return 0;
+}
+
+/*
+ * Generic mapping function (not visible outside):
+ */
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ */
+void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
+{
+ void * addr;
+ struct vm_struct * area;
+
+ if (phys_addr < virt_to_phys(high_memory))
+ return phys_to_virt(phys_addr);
+ if (phys_addr & ~PAGE_MASK)
+ return NULL;
+ size = PAGE_ALIGN(size);
+ if (!size || size > phys_addr + size)
+ return NULL;
+ area = get_vm_area(size, VM_IOREMAP);
+ if (!area)
+ return NULL;
+ addr = area->addr;
+ if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
+ vfree(addr);
+ return NULL;
+ }
+ return addr;
+}
+
+void iounmap(void *addr)
+{
+ if (addr > high_memory)
+ vfree(addr);
+}
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
new file mode 100644
index 00000000000..fb187e5a54b
--- /dev/null
+++ b/arch/s390/mm/mmap.c
@@ -0,0 +1,86 @@
+/*
+ * linux/arch/s390/mm/mmap.c
+ *
+ * flexible mmap layout support
+ *
+ * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * Started by Ingo Molnar <mingo@elte.hu>
+ */
+
+#include <linux/personality.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+
+/*
+ * Top of mmap area (just below the process stack).
+ *
+ * Leave an at least ~128 MB hole.
+ */
+#define MIN_GAP (128*1024*1024)
+#define MAX_GAP (TASK_SIZE/6*5)
+
+static inline unsigned long mmap_base(void)
+{
+ unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
+
+ if (gap < MIN_GAP)
+ gap = MIN_GAP;
+ else if (gap > MAX_GAP)
+ gap = MAX_GAP;
+
+ return TASK_SIZE - (gap & PAGE_MASK);
+}
+
+static inline int mmap_is_legacy(void)
+{
+#ifdef CONFIG_ARCH_S390X
+ /*
+ * Force standard allocation for 64 bit programs.
+ */
+ if (!test_thread_flag(TIF_31BIT))
+ return 1;
+#endif
+ return sysctl_legacy_va_layout ||
+ (current->personality & ADDR_COMPAT_LAYOUT) ||
+ current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY;
+}
+
+/*
+ * This function, called very early during the creation of a new
+ * process VM image, sets up which VM layout function to use:
+ */
+void arch_pick_mmap_layout(struct mm_struct *mm)
+{
+ /*
+ * Fall back to the standard layout if the personality
+ * bit is set, or if the expected stack growth is unlimited:
+ */
+ if (mmap_is_legacy()) {
+ mm->mmap_base = TASK_UNMAPPED_BASE;
+ mm->get_unmapped_area = arch_get_unmapped_area;
+ mm->unmap_area = arch_unmap_area;
+ } else {
+ mm->mmap_base = mmap_base();
+ mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+ mm->unmap_area = arch_unmap_area_topdown;
+ }
+}
+EXPORT_SYMBOL_GPL(arch_pick_mmap_layout);
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 10:02:59 +0000