diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/platforms/pseries/cmm.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/platforms/pseries/cmm.c | 742 |
1 files changed, 0 insertions, 742 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/cmm.c b/ANDROID_3.4.5/arch/powerpc/platforms/pseries/cmm.c deleted file mode 100644 index c6385357..00000000 --- a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/cmm.c +++ /dev/null @@ -1,742 +0,0 @@ -/* - * Collaborative memory management interface. - * - * Copyright (C) 2008 IBM Corporation - * Author(s): Brian King (brking@linux.vnet.ibm.com), - * - * 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 - * - */ - -#include <linux/ctype.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/fs.h> -#include <linux/gfp.h> -#include <linux/init.h> -#include <linux/kthread.h> -#include <linux/module.h> -#include <linux/oom.h> -#include <linux/reboot.h> -#include <linux/sched.h> -#include <linux/stringify.h> -#include <linux/swap.h> -#include <linux/device.h> -#include <asm/firmware.h> -#include <asm/hvcall.h> -#include <asm/mmu.h> -#include <asm/pgalloc.h> -#include <asm/uaccess.h> -#include <linux/memory.h> - -#include "plpar_wrappers.h" - -#define CMM_DRIVER_VERSION "1.0.0" -#define CMM_DEFAULT_DELAY 1 -#define CMM_HOTPLUG_DELAY 5 -#define CMM_DEBUG 0 -#define CMM_DISABLE 0 -#define CMM_OOM_KB 1024 -#define CMM_MIN_MEM_MB 256 -#define KB2PAGES(_p) ((_p)>>(PAGE_SHIFT-10)) -#define PAGES2KB(_p) ((_p)<<(PAGE_SHIFT-10)) -/* - * The priority level tries to ensure that this notifier is called as - * late as possible to reduce thrashing in the shared memory pool. - */ -#define CMM_MEM_HOTPLUG_PRI 1 -#define CMM_MEM_ISOLATE_PRI 15 - -static unsigned int delay = CMM_DEFAULT_DELAY; -static unsigned int hotplug_delay = CMM_HOTPLUG_DELAY; -static unsigned int oom_kb = CMM_OOM_KB; -static unsigned int cmm_debug = CMM_DEBUG; -static unsigned int cmm_disabled = CMM_DISABLE; -static unsigned long min_mem_mb = CMM_MIN_MEM_MB; -static struct device cmm_dev; - -MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>"); -MODULE_DESCRIPTION("IBM System p Collaborative Memory Manager"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(CMM_DRIVER_VERSION); - -module_param_named(delay, delay, uint, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(delay, "Delay (in seconds) between polls to query hypervisor paging requests. " - "[Default=" __stringify(CMM_DEFAULT_DELAY) "]"); -module_param_named(hotplug_delay, hotplug_delay, uint, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(delay, "Delay (in seconds) after memory hotplug remove " - "before loaning resumes. " - "[Default=" __stringify(CMM_HOTPLUG_DELAY) "]"); -module_param_named(oom_kb, oom_kb, uint, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(oom_kb, "Amount of memory in kb to free on OOM. " - "[Default=" __stringify(CMM_OOM_KB) "]"); -module_param_named(min_mem_mb, min_mem_mb, ulong, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(min_mem_mb, "Minimum amount of memory (in MB) to not balloon. " - "[Default=" __stringify(CMM_MIN_MEM_MB) "]"); -module_param_named(debug, cmm_debug, uint, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(debug, "Enable module debugging logging. Set to 1 to enable. " - "[Default=" __stringify(CMM_DEBUG) "]"); - -#define CMM_NR_PAGES ((PAGE_SIZE - sizeof(void *) - sizeof(unsigned long)) / sizeof(unsigned long)) - -#define cmm_dbg(...) if (cmm_debug) { printk(KERN_INFO "cmm: "__VA_ARGS__); } - -struct cmm_page_array { - struct cmm_page_array *next; - unsigned long index; - unsigned long page[CMM_NR_PAGES]; -}; - -static unsigned long loaned_pages; -static unsigned long loaned_pages_target; -static unsigned long oom_freed_pages; - -static struct cmm_page_array *cmm_page_list; -static DEFINE_SPINLOCK(cmm_lock); - -static DEFINE_MUTEX(hotplug_mutex); -static int hotplug_occurred; /* protected by the hotplug mutex */ - -static struct task_struct *cmm_thread_ptr; - -/** - * cmm_alloc_pages - Allocate pages and mark them as loaned - * @nr: number of pages to allocate - * - * Return value: - * number of pages requested to be allocated which were not - **/ -static long cmm_alloc_pages(long nr) -{ - struct cmm_page_array *pa, *npa; - unsigned long addr; - long rc; - - cmm_dbg("Begin request for %ld pages\n", nr); - - while (nr) { - /* Exit if a hotplug operation is in progress or occurred */ - if (mutex_trylock(&hotplug_mutex)) { - if (hotplug_occurred) { - mutex_unlock(&hotplug_mutex); - break; - } - mutex_unlock(&hotplug_mutex); - } else { - break; - } - - addr = __get_free_page(GFP_NOIO | __GFP_NOWARN | - __GFP_NORETRY | __GFP_NOMEMALLOC); - if (!addr) - break; - spin_lock(&cmm_lock); - pa = cmm_page_list; - if (!pa || pa->index >= CMM_NR_PAGES) { - /* Need a new page for the page list. */ - spin_unlock(&cmm_lock); - npa = (struct cmm_page_array *)__get_free_page( - GFP_NOIO | __GFP_NOWARN | - __GFP_NORETRY | __GFP_NOMEMALLOC); - if (!npa) { - pr_info("%s: Can not allocate new page list\n", __func__); - free_page(addr); - break; - } - spin_lock(&cmm_lock); - pa = cmm_page_list; - - if (!pa || pa->index >= CMM_NR_PAGES) { - npa->next = pa; - npa->index = 0; - pa = npa; - cmm_page_list = pa; - } else - free_page((unsigned long) npa); - } - - if ((rc = plpar_page_set_loaned(__pa(addr)))) { - pr_err("%s: Can not set page to loaned. rc=%ld\n", __func__, rc); - spin_unlock(&cmm_lock); - free_page(addr); - break; - } - - pa->page[pa->index++] = addr; - loaned_pages++; - totalram_pages--; - spin_unlock(&cmm_lock); - nr--; - } - - cmm_dbg("End request with %ld pages unfulfilled\n", nr); - return nr; -} - -/** - * cmm_free_pages - Free pages and mark them as active - * @nr: number of pages to free - * - * Return value: - * number of pages requested to be freed which were not - **/ -static long cmm_free_pages(long nr) -{ - struct cmm_page_array *pa; - unsigned long addr; - - cmm_dbg("Begin free of %ld pages.\n", nr); - spin_lock(&cmm_lock); - pa = cmm_page_list; - while (nr) { - if (!pa || pa->index <= 0) - break; - addr = pa->page[--pa->index]; - - if (pa->index == 0) { - pa = pa->next; - free_page((unsigned long) cmm_page_list); - cmm_page_list = pa; - } - - plpar_page_set_active(__pa(addr)); - free_page(addr); - loaned_pages--; - nr--; - totalram_pages++; - } - spin_unlock(&cmm_lock); - cmm_dbg("End request with %ld pages unfulfilled\n", nr); - return nr; -} - -/** - * cmm_oom_notify - OOM notifier - * @self: notifier block struct - * @dummy: not used - * @parm: returned - number of pages freed - * - * Return value: - * NOTIFY_OK - **/ -static int cmm_oom_notify(struct notifier_block *self, - unsigned long dummy, void *parm) -{ - unsigned long *freed = parm; - long nr = KB2PAGES(oom_kb); - - cmm_dbg("OOM processing started\n"); - nr = cmm_free_pages(nr); - loaned_pages_target = loaned_pages; - *freed += KB2PAGES(oom_kb) - nr; - oom_freed_pages += KB2PAGES(oom_kb) - nr; - cmm_dbg("OOM processing complete\n"); - return NOTIFY_OK; -} - -/** - * cmm_get_mpp - Read memory performance parameters - * - * Makes hcall to query the current page loan request from the hypervisor. - * - * Return value: - * nothing - **/ -static void cmm_get_mpp(void) -{ - int rc; - struct hvcall_mpp_data mpp_data; - signed long active_pages_target, page_loan_request, target; - signed long total_pages = totalram_pages + loaned_pages; - signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE; - - rc = h_get_mpp(&mpp_data); - - if (rc != H_SUCCESS) - return; - - page_loan_request = div_s64((s64)mpp_data.loan_request, PAGE_SIZE); - target = page_loan_request + (signed long)loaned_pages; - - if (target < 0 || total_pages < min_mem_pages) - target = 0; - - if (target > oom_freed_pages) - target -= oom_freed_pages; - else - target = 0; - - active_pages_target = total_pages - target; - - if (min_mem_pages > active_pages_target) - target = total_pages - min_mem_pages; - - if (target < 0) - target = 0; - - loaned_pages_target = target; - - cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = %lu\n", - page_loan_request, loaned_pages, loaned_pages_target, - oom_freed_pages, totalram_pages); -} - -static struct notifier_block cmm_oom_nb = { - .notifier_call = cmm_oom_notify -}; - -/** - * cmm_thread - CMM task thread - * @dummy: not used - * - * Return value: - * 0 - **/ -static int cmm_thread(void *dummy) -{ - unsigned long timeleft; - - while (1) { - timeleft = msleep_interruptible(delay * 1000); - - if (kthread_should_stop() || timeleft) - break; - - if (mutex_trylock(&hotplug_mutex)) { - if (hotplug_occurred) { - hotplug_occurred = 0; - mutex_unlock(&hotplug_mutex); - cmm_dbg("Hotplug operation has occurred, " - "loaning activity suspended " - "for %d seconds.\n", - hotplug_delay); - timeleft = msleep_interruptible(hotplug_delay * - 1000); - if (kthread_should_stop() || timeleft) - break; - continue; - } - mutex_unlock(&hotplug_mutex); - } else { - cmm_dbg("Hotplug operation in progress, activity " - "suspended\n"); - continue; - } - - cmm_get_mpp(); - - if (loaned_pages_target > loaned_pages) { - if (cmm_alloc_pages(loaned_pages_target - loaned_pages)) - loaned_pages_target = loaned_pages; - } else if (loaned_pages_target < loaned_pages) - cmm_free_pages(loaned_pages - loaned_pages_target); - } - return 0; -} - -#define CMM_SHOW(name, format, args...) \ - static ssize_t show_##name(struct device *dev, \ - struct device_attribute *attr, \ - char *buf) \ - { \ - return sprintf(buf, format, ##args); \ - } \ - static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) - -CMM_SHOW(loaned_kb, "%lu\n", PAGES2KB(loaned_pages)); -CMM_SHOW(loaned_target_kb, "%lu\n", PAGES2KB(loaned_pages_target)); - -static ssize_t show_oom_pages(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return sprintf(buf, "%lu\n", PAGES2KB(oom_freed_pages)); -} - -static ssize_t store_oom_pages(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - unsigned long val = simple_strtoul (buf, NULL, 10); - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - if (val != 0) - return -EBADMSG; - - oom_freed_pages = 0; - return count; -} - -static DEVICE_ATTR(oom_freed_kb, S_IWUSR | S_IRUGO, - show_oom_pages, store_oom_pages); - -static struct device_attribute *cmm_attrs[] = { - &dev_attr_loaned_kb, - &dev_attr_loaned_target_kb, - &dev_attr_oom_freed_kb, -}; - -static struct bus_type cmm_subsys = { - .name = "cmm", - .dev_name = "cmm", -}; - -/** - * cmm_sysfs_register - Register with sysfs - * - * Return value: - * 0 on success / other on failure - **/ -static int cmm_sysfs_register(struct device *dev) -{ - int i, rc; - - if ((rc = subsys_system_register(&cmm_subsys, NULL))) - return rc; - - dev->id = 0; - dev->bus = &cmm_subsys; - - if ((rc = device_register(dev))) - goto subsys_unregister; - - for (i = 0; i < ARRAY_SIZE(cmm_attrs); i++) { - if ((rc = device_create_file(dev, cmm_attrs[i]))) - goto fail; - } - - return 0; - -fail: - while (--i >= 0) - device_remove_file(dev, cmm_attrs[i]); - device_unregister(dev); -subsys_unregister: - bus_unregister(&cmm_subsys); - return rc; -} - -/** - * cmm_unregister_sysfs - Unregister from sysfs - * - **/ -static void cmm_unregister_sysfs(struct device *dev) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(cmm_attrs); i++) - device_remove_file(dev, cmm_attrs[i]); - device_unregister(dev); - bus_unregister(&cmm_subsys); -} - -/** - * cmm_reboot_notifier - Make sure pages are not still marked as "loaned" - * - **/ -static int cmm_reboot_notifier(struct notifier_block *nb, - unsigned long action, void *unused) -{ - if (action == SYS_RESTART) { - if (cmm_thread_ptr) - kthread_stop(cmm_thread_ptr); - cmm_thread_ptr = NULL; - cmm_free_pages(loaned_pages); - } - return NOTIFY_DONE; -} - -static struct notifier_block cmm_reboot_nb = { - .notifier_call = cmm_reboot_notifier, -}; - -/** - * cmm_count_pages - Count the number of pages loaned in a particular range. - * - * @arg: memory_isolate_notify structure with address range and count - * - * Return value: - * 0 on success - **/ -static unsigned long cmm_count_pages(void *arg) -{ - struct memory_isolate_notify *marg = arg; - struct cmm_page_array *pa; - unsigned long start = (unsigned long)pfn_to_kaddr(marg->start_pfn); - unsigned long end = start + (marg->nr_pages << PAGE_SHIFT); - unsigned long idx; - - spin_lock(&cmm_lock); - pa = cmm_page_list; - while (pa) { - if ((unsigned long)pa >= start && (unsigned long)pa < end) - marg->pages_found++; - for (idx = 0; idx < pa->index; idx++) - if (pa->page[idx] >= start && pa->page[idx] < end) - marg->pages_found++; - pa = pa->next; - } - spin_unlock(&cmm_lock); - return 0; -} - -/** - * cmm_memory_isolate_cb - Handle memory isolation notifier calls - * @self: notifier block struct - * @action: action to take - * @arg: struct memory_isolate_notify data for handler - * - * Return value: - * NOTIFY_OK or notifier error based on subfunction return value - **/ -static int cmm_memory_isolate_cb(struct notifier_block *self, - unsigned long action, void *arg) -{ - int ret = 0; - - if (action == MEM_ISOLATE_COUNT) - ret = cmm_count_pages(arg); - - return notifier_from_errno(ret); -} - -static struct notifier_block cmm_mem_isolate_nb = { - .notifier_call = cmm_memory_isolate_cb, - .priority = CMM_MEM_ISOLATE_PRI -}; - -/** - * cmm_mem_going_offline - Unloan pages where memory is to be removed - * @arg: memory_notify structure with page range to be offlined - * - * Return value: - * 0 on success - **/ -static int cmm_mem_going_offline(void *arg) -{ - struct memory_notify *marg = arg; - unsigned long start_page = (unsigned long)pfn_to_kaddr(marg->start_pfn); - unsigned long end_page = start_page + (marg->nr_pages << PAGE_SHIFT); - struct cmm_page_array *pa_curr, *pa_last, *npa; - unsigned long idx; - unsigned long freed = 0; - - cmm_dbg("Memory going offline, searching 0x%lx (%ld pages).\n", - start_page, marg->nr_pages); - spin_lock(&cmm_lock); - - /* Search the page list for pages in the range to be offlined */ - pa_last = pa_curr = cmm_page_list; - while (pa_curr) { - for (idx = (pa_curr->index - 1); (idx + 1) > 0; idx--) { - if ((pa_curr->page[idx] < start_page) || - (pa_curr->page[idx] >= end_page)) - continue; - - plpar_page_set_active(__pa(pa_curr->page[idx])); - free_page(pa_curr->page[idx]); - freed++; - loaned_pages--; - totalram_pages++; - pa_curr->page[idx] = pa_last->page[--pa_last->index]; - if (pa_last->index == 0) { - if (pa_curr == pa_last) - pa_curr = pa_last->next; - pa_last = pa_last->next; - free_page((unsigned long)cmm_page_list); - cmm_page_list = pa_last; - continue; - } - } - pa_curr = pa_curr->next; - } - - /* Search for page list structures in the range to be offlined */ - pa_last = NULL; - pa_curr = cmm_page_list; - while (pa_curr) { - if (((unsigned long)pa_curr >= start_page) && - ((unsigned long)pa_curr < end_page)) { - npa = (struct cmm_page_array *)__get_free_page( - GFP_NOIO | __GFP_NOWARN | - __GFP_NORETRY | __GFP_NOMEMALLOC); - if (!npa) { - spin_unlock(&cmm_lock); - cmm_dbg("Failed to allocate memory for list " - "management. Memory hotplug " - "failed.\n"); - return ENOMEM; - } - memcpy(npa, pa_curr, PAGE_SIZE); - if (pa_curr == cmm_page_list) - cmm_page_list = npa; - if (pa_last) - pa_last->next = npa; - free_page((unsigned long) pa_curr); - freed++; - pa_curr = npa; - } - - pa_last = pa_curr; - pa_curr = pa_curr->next; - } - - spin_unlock(&cmm_lock); - cmm_dbg("Released %ld pages in the search range.\n", freed); - - return 0; -} - -/** - * cmm_memory_cb - Handle memory hotplug notifier calls - * @self: notifier block struct - * @action: action to take - * @arg: struct memory_notify data for handler - * - * Return value: - * NOTIFY_OK or notifier error based on subfunction return value - * - **/ -static int cmm_memory_cb(struct notifier_block *self, - unsigned long action, void *arg) -{ - int ret = 0; - - switch (action) { - case MEM_GOING_OFFLINE: - mutex_lock(&hotplug_mutex); - hotplug_occurred = 1; - ret = cmm_mem_going_offline(arg); - break; - case MEM_OFFLINE: - case MEM_CANCEL_OFFLINE: - mutex_unlock(&hotplug_mutex); - cmm_dbg("Memory offline operation complete.\n"); - break; - case MEM_GOING_ONLINE: - case MEM_ONLINE: - case MEM_CANCEL_ONLINE: - break; - } - - return notifier_from_errno(ret); -} - -static struct notifier_block cmm_mem_nb = { - .notifier_call = cmm_memory_cb, - .priority = CMM_MEM_HOTPLUG_PRI -}; - -/** - * cmm_init - Module initialization - * - * Return value: - * 0 on success / other on failure - **/ -static int cmm_init(void) -{ - int rc = -ENOMEM; - - if (!firmware_has_feature(FW_FEATURE_CMO)) - return -EOPNOTSUPP; - - if ((rc = register_oom_notifier(&cmm_oom_nb)) < 0) - return rc; - - if ((rc = register_reboot_notifier(&cmm_reboot_nb))) - goto out_oom_notifier; - - if ((rc = cmm_sysfs_register(&cmm_dev))) - goto out_reboot_notifier; - - if (register_memory_notifier(&cmm_mem_nb) || - register_memory_isolate_notifier(&cmm_mem_isolate_nb)) - goto out_unregister_notifier; - - if (cmm_disabled) - return rc; - - cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread"); - if (IS_ERR(cmm_thread_ptr)) { - rc = PTR_ERR(cmm_thread_ptr); - goto out_unregister_notifier; - } - - return rc; - -out_unregister_notifier: - unregister_memory_notifier(&cmm_mem_nb); - unregister_memory_isolate_notifier(&cmm_mem_isolate_nb); - cmm_unregister_sysfs(&cmm_dev); -out_reboot_notifier: - unregister_reboot_notifier(&cmm_reboot_nb); -out_oom_notifier: - unregister_oom_notifier(&cmm_oom_nb); - return rc; -} - -/** - * cmm_exit - Module exit - * - * Return value: - * nothing - **/ -static void cmm_exit(void) -{ - if (cmm_thread_ptr) - kthread_stop(cmm_thread_ptr); - unregister_oom_notifier(&cmm_oom_nb); - unregister_reboot_notifier(&cmm_reboot_nb); - unregister_memory_notifier(&cmm_mem_nb); - unregister_memory_isolate_notifier(&cmm_mem_isolate_nb); - cmm_free_pages(loaned_pages); - cmm_unregister_sysfs(&cmm_dev); -} - -/** - * cmm_set_disable - Disable/Enable CMM - * - * Return value: - * 0 on success / other on failure - **/ -static int cmm_set_disable(const char *val, struct kernel_param *kp) -{ - int disable = simple_strtoul(val, NULL, 10); - - if (disable != 0 && disable != 1) - return -EINVAL; - - if (disable && !cmm_disabled) { - if (cmm_thread_ptr) - kthread_stop(cmm_thread_ptr); - cmm_thread_ptr = NULL; - cmm_free_pages(loaned_pages); - } else if (!disable && cmm_disabled) { - cmm_thread_ptr = kthread_run(cmm_thread, NULL, "cmmthread"); - if (IS_ERR(cmm_thread_ptr)) - return PTR_ERR(cmm_thread_ptr); - } - - cmm_disabled = disable; - return 0; -} - -module_param_call(disable, cmm_set_disable, param_get_uint, - &cmm_disabled, S_IRUGO | S_IWUSR); -MODULE_PARM_DESC(disable, "Disable CMM. Set to 1 to disable. " - "[Default=" __stringify(CMM_DISABLE) "]"); - -module_init(cmm_init); -module_exit(cmm_exit); |