[PATCH] s390: channel path measurements (495a5b45) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/s390/cio/chsc.c

+432 −22

Original line number	Diff line number	Diff line
		@@ -98,10 +98,8 @@ chsc_get_sch_desc_irq(struct subchannel sch, void page)

		ssd_area = page;

		ssd_area->request = (struct chsc_header) {
		.length = 0x0010,
		.code = 0x0004,
		};
		ssd_area->request.length = 0x0010;
		ssd_area->request.code = 0x0004;

		ssd_area->ssid = sch->schid.ssid;
		ssd_area->f_sch = sch->schid.sch_no;
		@@ -517,10 +515,8 @@ chsc_process_crw(void)
		struct device *dev;
		memset(sei_area, 0, sizeof(*sei_area));
		memset(&res_data, 0, sizeof(struct res_acc_data));
		sei_area->request = (struct chsc_header) {
		.length = 0x0010,
		.code = 0x000e,
		};
		sei_area->request.length = 0x0010;
		sei_area->request.code = 0x000e;

		ccode = chsc(sei_area);
		if (ccode > 0)
		@@ -874,6 +870,264 @@ s390_vary_chpid( __u8 chpid, int on)
		return 0;
		}

		/*
		* 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 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.length = 0x0050;
		secm_area->request.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.
		*/
		@@ -925,9 +1179,39 @@ chp_type_show(struct device dev, struct device_attribute attr, char *buf)

		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,
		};

		@@ -966,10 +1250,8 @@ chsc_determine_channel_path_description(int chpid,
		if (!scpd_area)
		return -ENOMEM;

		scpd_area->request = (struct chsc_header) {
		.length = 0x0010,
		.code = 0x0002,
		};
		scpd_area->request.length = 0x0010;
		scpd_area->request.code = 0x0002;

		scpd_area->first_chpid = chpid;
		scpd_area->last_chpid = chpid;
		@@ -1006,6 +1288,111 @@ chsc_determine_channel_path_description(int chpid,
		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.length = 0x0010;
		scmc_area->request.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 +1421,22 @@ 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 +1449,19 @@ new_channel_path(int chpid)
		if (ret) {
		device_unregister(&chp->dev);
		goto out_free;
		} else
		}
		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);
		@@ -1103,10 +1517,8 @@ chsc_enable_facility(int operation_code)
		sda_area = (void *)get_zeroed_page(GFP_KERNEL\|GFP_DMA);
		if (!sda_area)
		return -ENOMEM;
		sda_area->request = (struct chsc_header) {
		.length = 0x0400,
		.code = 0x0031,
		};
		sda_area->request.length = 0x0400;
		sda_area->request.code = 0x0031;
		sda_area->operation_code = operation_code;

		ret = chsc(sda_area);
		@@ -1161,10 +1573,8 @@ chsc_determine_css_characteristics(void)
		return -ENOMEM;
		}

		scsc_area->request = (struct chsc_header) {
		.length = 0x0010,
		.code = 0x0010,
		};
		scsc_area->request.length = 0x0010;
		scsc_area->request.code = 0x0010;

		result = chsc(scsc_area);
		if (result) {

drivers/s390/cio/chsc.h

+21 −1

Original line number	Diff line number	Diff line
		@@ -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)

drivers/s390/cio/css.c

+41 −0

Original line number	Diff line number	Diff line
		@@ -452,15 +452,50 @@ channel_subsystem_release(struct device *dev)
		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 @@ init_channel_subsystem (void)
		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:

drivers/s390/cio/css.h

+6 −0

Original line number	Diff line number	Diff line
		#ifndef _CSS_H
		#define _CSS_H

		#include <linux/mutex.h>
		#include <linux/wait.h>
		#include <linux/workqueue.h>

		@@ -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)