Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
new file mode 100644
index 0000000..d30cdb4
--- /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");