diff options
Diffstat (limited to 'drivers/s390/char/sclp.c')
-rw-r--r-- | drivers/s390/char/sclp.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index bd6871b..a77febe 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -50,11 +50,42 @@ static char sclp_init_sccb[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); /* Suspend request */ static DECLARE_COMPLETION(sclp_request_queue_flushed); +/* Number of console pages to allocate, used by sclp_con.c and sclp_vt220.c */ +int sclp_console_pages = SCLP_CONSOLE_PAGES; +/* Flag to indicate if buffer pages are dropped on buffer full condition */ +int sclp_console_drop = 0; +/* Number of times the console dropped buffer pages */ +unsigned long sclp_console_full; + static void sclp_suspend_req_cb(struct sclp_req *req, void *data) { complete(&sclp_request_queue_flushed); } +static int __init sclp_setup_console_pages(char *str) +{ + int pages, rc; + + rc = kstrtoint(str, 0, &pages); + if (!rc && pages >= SCLP_CONSOLE_PAGES) + sclp_console_pages = pages; + return 1; +} + +__setup("sclp_con_pages=", sclp_setup_console_pages); + +static int __init sclp_setup_console_drop(char *str) +{ + int drop, rc; + + rc = kstrtoint(str, 0, &drop); + if (!rc && drop) + sclp_console_drop = 1; + return 1; +} + +__setup("sclp_con_drop=", sclp_setup_console_drop); + static struct sclp_req sclp_suspend_req; /* Timer for request retries. */ @@ -1013,11 +1044,47 @@ static const struct dev_pm_ops sclp_pm_ops = { .restore = sclp_restore, }; +static ssize_t sclp_show_console_pages(struct device_driver *dev, char *buf) +{ + return sprintf(buf, "%i\n", sclp_console_pages); +} + +static DRIVER_ATTR(con_pages, S_IRUSR, sclp_show_console_pages, NULL); + +static ssize_t sclp_show_con_drop(struct device_driver *dev, char *buf) +{ + return sprintf(buf, "%i\n", sclp_console_drop); +} + +static DRIVER_ATTR(con_drop, S_IRUSR, sclp_show_con_drop, NULL); + +static ssize_t sclp_show_console_full(struct device_driver *dev, char *buf) +{ + return sprintf(buf, "%lu\n", sclp_console_full); +} + +static DRIVER_ATTR(con_full, S_IRUSR, sclp_show_console_full, NULL); + +static struct attribute *sclp_drv_attrs[] = { + &driver_attr_con_pages.attr, + &driver_attr_con_drop.attr, + &driver_attr_con_full.attr, + NULL, +}; +static struct attribute_group sclp_drv_attr_group = { + .attrs = sclp_drv_attrs, +}; +static const struct attribute_group *sclp_drv_attr_groups[] = { + &sclp_drv_attr_group, + NULL, +}; + static struct platform_driver sclp_pdrv = { .driver = { .name = "sclp", .owner = THIS_MODULE, .pm = &sclp_pm_ops, + .groups = sclp_drv_attr_groups, }, }; @@ -1096,10 +1163,12 @@ static __init int sclp_initcall(void) rc = platform_driver_register(&sclp_pdrv); if (rc) return rc; + sclp_pdev = platform_device_register_simple("sclp", -1, NULL, 0); rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0; if (rc) goto fail_platform_driver_unregister; + rc = atomic_notifier_chain_register(&panic_notifier_list, &sclp_on_panic_nb); if (rc) |