Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751080AbWCVPPQ (ORCPT ); Wed, 22 Mar 2006 10:15:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751277AbWCVPPQ (ORCPT ); Wed, 22 Mar 2006 10:15:16 -0500 Received: from mtagate3.de.ibm.com ([195.212.29.152]:15022 "EHLO mtagate3.de.ibm.com") by vger.kernel.org with ESMTP id S1751080AbWCVPPM (ORCPT ); Wed, 22 Mar 2006 10:15:12 -0500 Date: Wed, 22 Mar 2006 16:15:39 +0100 From: Martin Schwidefsky To: akpm@osdl.org, cornelia.huck@de.ibm.com, linux-kernel@vger.kernel.org Subject: [patch 3/24] s390: channel path measurements. Message-ID: <20060322151539.GC5801@skybase.boeblingen.de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 15942 Lines: 641 From: Cornelia Huck [patch 3/24] s390: channel path measurements. Gather extended measurements for channel paths from the channel subsystem and expose them to userspace via a sysfs attribute. Signed-off-by: Cornelia Huck Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/chsc.c | 428 +++++++++++++++++++++++++++++++++++++++++++++++- drivers/s390/cio/chsc.h | 22 ++ drivers/s390/cio/css.c | 41 ++++ drivers/s390/cio/css.h | 6 4 files changed, 494 insertions(+), 3 deletions(-) diff -urpN linux-2.6/drivers/s390/cio/chsc.c linux-2.6-patched/drivers/s390/cio/chsc.c --- linux-2.6/drivers/s390/cio/chsc.c 2006-03-20 06:53:29.000000000 +0100 +++ linux-2.6-patched/drivers/s390/cio/chsc.c 2006-03-22 14:36:11.000000000 +0100 @@ -875,6 +875,266 @@ s390_vary_chpid( __u8 chpid, int on) } /* + * Channel measurement related functions + */ +static ssize_t +chp_measurement_chars_read(struct kobject *kobj, char *buf, loff_t off, + size_t count) +{ + struct channel_path *chp; + unsigned int size; + + chp = to_channelpath(container_of(kobj, struct device, kobj)); + if (!chp->cmg_chars) + return 0; + + size = sizeof(struct cmg_chars); + + if (off > size) + return 0; + if (off + count > size) + count = size - off; + memcpy(buf, chp->cmg_chars + off, count); + return count; +} + +static struct bin_attribute chp_measurement_chars_attr = { + .attr = { + .name = "measurement_chars", + .mode = S_IRUSR, + .owner = THIS_MODULE, + }, + .size = sizeof(struct cmg_chars), + .read = chp_measurement_chars_read, +}; + +static void +chp_measurement_copy_block(struct cmg_entry *buf, + struct channel_subsystem *css, int chpid) +{ + void *area; + struct cmg_entry *entry, reference_buf; + int idx; + + if (chpid < 128) { + area = css->cub_addr1; + idx = chpid; + } else { + area = css->cub_addr2; + idx = chpid - 128; + } + entry = area + (idx * sizeof(struct cmg_entry)); + do { + memcpy(buf, entry, sizeof(*entry)); + memcpy(&reference_buf, entry, sizeof(*entry)); + } while (reference_buf.values[0] != buf->values[0]); +} + +static ssize_t +chp_measurement_read(struct kobject *kobj, char *buf, loff_t off, size_t count) +{ + struct channel_path *chp; + struct channel_subsystem *css; + unsigned int size; + + chp = to_channelpath(container_of(kobj, struct device, kobj)); + css = to_css(chp->dev.parent); + + size = sizeof(struct cmg_chars); + + /* Only allow single reads. */ + if (off || count < size) + return 0; + chp_measurement_copy_block((struct cmg_entry *)buf, css, chp->id); + return count; +} + +static struct bin_attribute chp_measurement_attr = { + .attr = { + .name = "measurement", + .mode = S_IRUSR, + .owner = THIS_MODULE, + }, + .size = sizeof(struct cmg_entry), + .read = chp_measurement_read, +}; + +static void +chsc_remove_chp_cmg_attr(struct channel_path *chp) +{ + sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_chars_attr); + sysfs_remove_bin_file(&chp->dev.kobj, &chp_measurement_attr); +} + +static int +chsc_add_chp_cmg_attr(struct channel_path *chp) +{ + int ret; + + ret = sysfs_create_bin_file(&chp->dev.kobj, + &chp_measurement_chars_attr); + if (ret) + return ret; + ret = sysfs_create_bin_file(&chp->dev.kobj, &chp_measurement_attr); + if (ret) + sysfs_remove_bin_file(&chp->dev.kobj, + &chp_measurement_chars_attr); + return ret; +} + +static void +chsc_remove_cmg_attr(struct channel_subsystem *css) +{ + int i; + + for (i = 0; i <= __MAX_CHPID; i++) { + if (!css->chps[i]) + continue; + chsc_remove_chp_cmg_attr(css->chps[i]); + } +} + +static int +chsc_add_cmg_attr(struct channel_subsystem *css) +{ + int i, ret; + + ret = 0; + for (i = 0; i <= __MAX_CHPID; i++) { + if (!css->chps[i]) + continue; + ret = chsc_add_chp_cmg_attr(css->chps[i]); + if (ret) + goto cleanup; + } + return ret; +cleanup: + for (--i; i >= 0; i--) { + if (!css->chps[i]) + continue; + chsc_remove_chp_cmg_attr(css->chps[i]); + } + return ret; +} + + +static inline int +__chsc_do_secm(struct channel_subsystem *css, int enable, void *page) +{ + struct { + struct chsc_header request; + u32 operation_code : 2; + u32 : 30; + u32 key : 4; + u32 : 28; + u32 zeroes1; + u32 cub_addr1; + u32 zeroes2; + u32 cub_addr2; + u32 reserved[13]; + struct chsc_header response; + u32 status : 8; + u32 : 4; + u32 fmt : 4; + u32 : 16; + } *secm_area; + int ret, ccode; + + secm_area = page; + secm_area->request = (struct chsc_header) { + .length = 0x0050, + .code = 0x0016, + }; + + secm_area->key = PAGE_DEFAULT_KEY; + secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1; + secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2; + + secm_area->operation_code = enable ? 0 : 1; + + ccode = chsc(secm_area); + if (ccode > 0) + return (ccode == 3) ? -ENODEV : -EBUSY; + + switch (secm_area->response.code) { + case 0x0001: /* Success. */ + ret = 0; + break; + case 0x0003: /* Invalid block. */ + case 0x0007: /* Invalid format. */ + case 0x0008: /* Other invalid block. */ + CIO_CRW_EVENT(2, "Error in chsc request block!\n"); + ret = -EINVAL; + break; + case 0x0004: /* Command not provided in model. */ + CIO_CRW_EVENT(2, "Model does not provide secm\n"); + ret = -EOPNOTSUPP; + break; + case 0x0102: /* cub adresses incorrect */ + CIO_CRW_EVENT(2, "Invalid addresses in chsc request block\n"); + ret = -EINVAL; + break; + case 0x0103: /* key error */ + CIO_CRW_EVENT(2, "Access key error in secm\n"); + ret = -EINVAL; + break; + case 0x0105: /* error while starting */ + CIO_CRW_EVENT(2, "Error while starting channel measurement\n"); + ret = -EIO; + break; + default: + CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", + secm_area->response.code); + ret = -EIO; + } + return ret; +} + +int +chsc_secm(struct channel_subsystem *css, int enable) +{ + void *secm_area; + int ret; + + secm_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!secm_area) + return -ENOMEM; + + mutex_lock(&css->mutex); + if (enable && !css->cm_enabled) { + css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!css->cub_addr1 || !css->cub_addr2) { + free_page((unsigned long)css->cub_addr1); + free_page((unsigned long)css->cub_addr2); + free_page((unsigned long)secm_area); + mutex_unlock(&css->mutex); + return -ENOMEM; + } + } + ret = __chsc_do_secm(css, enable, secm_area); + if (!ret) { + css->cm_enabled = enable; + if (css->cm_enabled) { + ret = chsc_add_cmg_attr(css); + if (ret) { + memset(secm_area, 0, PAGE_SIZE); + __chsc_do_secm(css, 0, secm_area); + css->cm_enabled = 0; + } + } else + chsc_remove_cmg_attr(css); + } + if (enable && !css->cm_enabled) { + free_page((unsigned long)css->cub_addr1); + free_page((unsigned long)css->cub_addr2); + } + mutex_unlock(&css->mutex); + free_page((unsigned long)secm_area); + return ret; +} + +/* * Files for the channel path entries. */ static ssize_t @@ -925,9 +1185,39 @@ chp_type_show(struct device *dev, struct static DEVICE_ATTR(type, 0444, chp_type_show, NULL); +static ssize_t +chp_cmg_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + + if (!chp) + return 0; + if (chp->cmg == -1) /* channel measurements not available */ + return sprintf(buf, "unknown\n"); + return sprintf(buf, "%x\n", chp->cmg); +} + +static DEVICE_ATTR(cmg, 0444, chp_cmg_show, NULL); + +static ssize_t +chp_shared_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct channel_path *chp = to_channelpath(dev); + + if (!chp) + return 0; + if (chp->shared == -1) /* channel measurements not available */ + return sprintf(buf, "unknown\n"); + return sprintf(buf, "%x\n", chp->shared); +} + +static DEVICE_ATTR(shared, 0444, chp_shared_show, NULL); + static struct attribute * chp_attrs[] = { &dev_attr_status.attr, &dev_attr_type.attr, + &dev_attr_cmg.attr, + &dev_attr_shared.attr, NULL, }; @@ -1006,6 +1296,113 @@ out: return ret; } +static void +chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv, + struct cmg_chars *chars) +{ + switch (chp->cmg) { + case 2: + case 3: + chp->cmg_chars = kmalloc(sizeof(struct cmg_chars), + GFP_KERNEL); + if (chp->cmg_chars) { + int i, mask; + struct cmg_chars *cmg_chars; + + cmg_chars = chp->cmg_chars; + for (i = 0; i < NR_MEASUREMENT_CHARS; i++) { + mask = 0x80 >> (i + 3); + if (cmcv & mask) + cmg_chars->values[i] = chars->values[i]; + else + cmg_chars->values[i] = 0; + } + } + break; + default: + /* No cmg-dependent data. */ + break; + } +} + +static int +chsc_get_channel_measurement_chars(struct channel_path *chp) +{ + int ccode, ret; + + struct { + struct chsc_header request; + u32 : 24; + u32 first_chpid : 8; + u32 : 24; + u32 last_chpid : 8; + u32 zeroes1; + struct chsc_header response; + u32 zeroes2; + u32 not_valid : 1; + u32 shared : 1; + u32 : 22; + u32 chpid : 8; + u32 cmcv : 5; + u32 : 11; + u32 cmgq : 8; + u32 cmg : 8; + u32 zeroes3; + u32 data[NR_MEASUREMENT_CHARS]; + } *scmc_area; + + scmc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + if (!scmc_area) + return -ENOMEM; + + scmc_area->request = (struct chsc_header) { + .length = 0x0010, + .code = 0x0022, + }; + + scmc_area->first_chpid = chp->id; + scmc_area->last_chpid = chp->id; + + ccode = chsc(scmc_area); + if (ccode > 0) { + ret = (ccode == 3) ? -ENODEV : -EBUSY; + goto out; + } + + switch (scmc_area->response.code) { + case 0x0001: /* Success. */ + if (!scmc_area->not_valid) { + chp->cmg = scmc_area->cmg; + chp->shared = scmc_area->shared; + chsc_initialize_cmg_chars(chp, scmc_area->cmcv, + (struct cmg_chars *) + &scmc_area->data); + } else { + chp->cmg = -1; + chp->shared = -1; + } + ret = 0; + break; + case 0x0003: /* Invalid block. */ + case 0x0007: /* Invalid format. */ + case 0x0008: /* Invalid bit combination. */ + CIO_CRW_EVENT(2, "Error in chsc request block!\n"); + ret = -EINVAL; + break; + case 0x0004: /* Command not provided. */ + CIO_CRW_EVENT(2, "Model does not provide scmc\n"); + ret = -EOPNOTSUPP; + break; + default: + CIO_CRW_EVENT(2, "Unknown CHSC response %d\n", + scmc_area->response.code); + ret = -EIO; + } +out: + free_page((unsigned long)scmc_area); + return ret; +} + /* * Entries for chpids on the system bus. * This replaces /proc/chpids. @@ -1034,6 +1431,22 @@ new_channel_path(int chpid) ret = chsc_determine_channel_path_description(chpid, &chp->desc); if (ret) goto out_free; + /* Get channel-measurement characteristics. */ + if (css_characteristics_avail && css_chsc_characteristics.scmc + && css_chsc_characteristics.secm) { + ret = chsc_get_channel_measurement_chars(chp); + if (ret) + goto out_free; + } else { + static int msg_done; + + if (!msg_done) { + printk(KERN_WARNING "cio: Channel measurements not " + "available, continuing.\n"); + msg_done = 1; + } + chp->cmg = -1; + } /* make it known to the system */ ret = device_register(&chp->dev); @@ -1046,8 +1459,19 @@ new_channel_path(int chpid) if (ret) { device_unregister(&chp->dev); goto out_free; - } else - css[0]->chps[chpid] = chp; + } + mutex_lock(&css[0]->mutex); + if (css[0]->cm_enabled) { + ret = chsc_add_chp_cmg_attr(chp); + if (ret) { + sysfs_remove_group(&chp->dev.kobj, &chp_attr_group); + device_unregister(&chp->dev); + mutex_unlock(&css[0]->mutex); + goto out_free; + } + } + css[0]->chps[chpid] = chp; + mutex_unlock(&css[0]->mutex); return ret; out_free: kfree(chp); diff -urpN linux-2.6/drivers/s390/cio/chsc.h linux-2.6-patched/drivers/s390/cio/chsc.h --- linux-2.6/drivers/s390/cio/chsc.h 2006-03-20 06:53:29.000000000 +0100 +++ linux-2.6-patched/drivers/s390/cio/chsc.h 2006-03-22 14:36:11.000000000 +0100 @@ -12,6 +12,16 @@ struct chsc_header { u16 code; }; +#define NR_MEASUREMENT_CHARS 5 +struct cmg_chars { + u32 values[NR_MEASUREMENT_CHARS]; +}; + +#define NR_MEASUREMENT_ENTRIES 8 +struct cmg_entry { + u32 values[NR_MEASUREMENT_ENTRIES]; +}; + struct channel_path_desc { u8 flags; u8 lsn; @@ -27,6 +37,10 @@ struct channel_path { int id; int state; struct channel_path_desc desc; + /* Channel-measurement related stuff: */ + int cmg; + int shared; + void *cmg_chars; struct device dev; }; @@ -52,7 +66,11 @@ struct css_general_char { struct css_chsc_char { u64 res; - u64 : 43; + u64 : 20; + u32 secm : 1; /* bit 84 */ + u32 : 1; + u32 scmc : 1; /* bit 86 */ + u32 : 20; u32 scssc : 1; /* bit 107 */ u32 scsscf : 1; /* bit 108 */ u32 : 19; @@ -67,6 +85,8 @@ extern int css_characteristics_avail; extern void *chsc_get_chp_desc(struct subchannel*, int); extern int chsc_enable_facility(int); +struct channel_subsystem; +extern int chsc_secm(struct channel_subsystem *, int); #define to_channelpath(device) container_of(device, struct channel_path, dev) diff -urpN linux-2.6/drivers/s390/cio/css.c linux-2.6-patched/drivers/s390/cio/css.c --- linux-2.6/drivers/s390/cio/css.c 2006-03-20 06:53:29.000000000 +0100 +++ linux-2.6-patched/drivers/s390/cio/css.c 2006-03-22 14:36:11.000000000 +0100 @@ -452,15 +452,50 @@ channel_subsystem_release(struct device struct channel_subsystem *css; css = to_css(dev); + mutex_destroy(&css->mutex); kfree(css); } +static ssize_t +css_cm_enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct channel_subsystem *css = to_css(dev); + + if (!css) + return 0; + return sprintf(buf, "%x\n", css->cm_enabled); +} + +static ssize_t +css_cm_enable_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct channel_subsystem *css = to_css(dev); + int ret; + + switch (buf[0]) { + case '0': + ret = css->cm_enabled ? chsc_secm(css, 0) : 0; + break; + case '1': + ret = css->cm_enabled ? 0 : chsc_secm(css, 1); + break; + default: + ret = -EINVAL; + } + return ret < 0 ? ret : count; +} + +static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); + static inline void __init setup_css(int nr) { u32 tod_high; memset(css[nr], 0, sizeof(struct channel_subsystem)); + mutex_init(&css[nr]->mutex); css[nr]->valid = 1; css[nr]->cssid = nr; sprintf(css[nr]->device.bus_id, "css%x", nr); @@ -507,6 +542,9 @@ init_channel_subsystem (void) ret = device_register(&css[i]->device); if (ret) goto out_free; + if (css_characteristics_avail && css_chsc_characteristics.secm) + device_create_file(&css[i]->device, + &dev_attr_cm_enable); } css_init_done = 1; @@ -519,6 +557,9 @@ out_free: out_unregister: while (i > 0) { i--; + if (css_characteristics_avail && css_chsc_characteristics.secm) + device_remove_file(&css[i]->device, + &dev_attr_cm_enable); device_unregister(&css[i]->device); } out_bus: diff -urpN linux-2.6/drivers/s390/cio/css.h linux-2.6-patched/drivers/s390/cio/css.h --- linux-2.6/drivers/s390/cio/css.h 2006-03-20 06:53:29.000000000 +0100 +++ linux-2.6-patched/drivers/s390/cio/css.h 2006-03-22 14:36:11.000000000 +0100 @@ -1,6 +1,7 @@ #ifndef _CSS_H #define _CSS_H +#include #include #include @@ -150,6 +151,11 @@ struct channel_subsystem { struct channel_path *chps[__MAX_CHPID + 1]; struct device device; struct pgid global_pgid; + struct mutex mutex; + /* channel measurement related */ + int cm_enabled; + void *cub_addr1; + void *cub_addr2; }; #define to_css(dev) container_of(dev, struct channel_subsystem, device) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/