chsc.c

linux 内核源代码

}

void chsc_chp_online(struct chp_id chpid)
{
	char dbf_txt[15];

	sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
	CIO_TRACE_EVENT(2, dbf_txt);

	if (chp_get_status(chpid) != 0)
		for_each_subchannel(__chp_add, &chpid);
}

static void __s390_subchannel_vary_chpid(struct subchannel *sch,
					 struct chp_id chpid, int on)
{
	int chp, old_lpm;
	int mask;
	unsigned long flags;

	spin_lock_irqsave(sch->lock, flags);
	old_lpm = sch->lpm;
	for (chp = 0; chp < 8; chp++) {
		mask = 0x80 >> chp;
		if (!(sch->ssd_info.path_mask & mask))
			continue;
		if (!chp_id_is_equal(&sch->ssd_info.chpid[chp], &chpid))
			continue;

		if (on) {
			sch->opm |= mask;
			sch->lpm |= mask;
			if (!old_lpm)
				device_trigger_reprobe(sch);
			else if (sch->driver && sch->driver->verify)
				sch->driver->verify(&sch->dev);
			break;
		}
		sch->opm &= ~mask;
		sch->lpm &= ~mask;
		if (check_for_io_on_path(sch, mask)) {
			if (device_is_online(sch))
				/* Path verification is done after killing. */
				device_kill_io(sch);
			else {
				/* Kill and retry internal I/O. */
				terminate_internal_io(sch);
				/* Re-start path verification. */
				if (sch->driver && sch->driver->verify)
					sch->driver->verify(&sch->dev);
			}
		} else if (!sch->lpm) {
			if (device_trigger_verify(sch) != 0)
				css_schedule_eval(sch->schid);
		} else if (sch->driver && sch->driver->verify)
			sch->driver->verify(&sch->dev);
		break;
	}
	spin_unlock_irqrestore(sch->lock, flags);
}

static int s390_subchannel_vary_chpid_off(struct device *dev, void *data)
{
	struct subchannel *sch;
	struct chp_id *chpid;

	sch = to_subchannel(dev);
	chpid = data;

	__s390_subchannel_vary_chpid(sch, *chpid, 0);
	return 0;
}

static int s390_subchannel_vary_chpid_on(struct device *dev, void *data)
{
	struct subchannel *sch;
	struct chp_id *chpid;

	sch = to_subchannel(dev);
	chpid = data;

	__s390_subchannel_vary_chpid(sch, *chpid, 1);
	return 0;
}

static int
__s390_vary_chpid_on(struct subchannel_id schid, void *data)
{
	struct schib schib;
	struct subchannel *sch;

	sch = get_subchannel_by_schid(schid);
	if (sch) {
		put_device(&sch->dev);
		return 0;
	}
	if (stsch_err(schid, &schib))
		/* We're through */
		return -ENXIO;
	/* Put it on the slow path. */
	css_schedule_eval(schid);
	return 0;
}

/**
 * chsc_chp_vary - propagate channel-path vary operation to subchannels
 * @chpid: channl-path ID
 * @on: non-zero for vary online, zero for vary offline
 */
int chsc_chp_vary(struct chp_id chpid, int on)
{
	/*
	 * Redo PathVerification on the devices the chpid connects to
	 */

	bus_for_each_dev(&css_bus_type, NULL, &chpid, on ?
			 s390_subchannel_vary_chpid_on :
			 s390_subchannel_vary_chpid_off);
	if (on)
		/* Scan for new devices on varied on path. */
		for_each_subchannel(__s390_vary_chpid_on, NULL);
	return 0;
}

static void
chsc_remove_cmg_attr(struct channel_subsystem *css)
{
	int i;

	for (i = 0; i <= __MAX_CHPID; i++) {
		if (!css->chps[i])
			continue;
		chp_remove_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 = chp_add_cmg_attr(css->chps[i]);
		if (ret)
			goto cleanup;
	}
	return ret;
cleanup:
	for (--i; i >= 0; i--) {
		if (!css->chps[i])
			continue;
		chp_remove_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;
	} __attribute__ ((packed)) *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 (!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;
}

int chsc_determine_channel_path_description(struct chp_id chpid,
					    struct channel_path_desc *desc)
{
	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;
		struct channel_path_desc desc;
	} __attribute__ ((packed)) *scpd_area;

	scpd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!scpd_area)
		return -ENOMEM;

	scpd_area->request.length = 0x0010;
	scpd_area->request.code = 0x0002;

	scpd_area->first_chpid = chpid.id;
	scpd_area->last_chpid = chpid.id;

	ccode = chsc(scpd_area);
	if (ccode > 0) {
		ret = (ccode == 3) ? -ENODEV : -EBUSY;
		goto out;
	}

	switch (scpd_area->response.code) {
	case 0x0001: /* Success. */
		memcpy(desc, &scpd_area->desc,
		       sizeof(struct channel_path_desc));
		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 scpd\n");
		ret = -EOPNOTSUPP;
		break;
	default:
		CIO_CRW_EVENT(2, "Unknown CHSC response %d\n",
			      scpd_area->response.code);
		ret = -EIO;
	}
out:
	free_page((unsigned long)scpd_area);
	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;
	}
}

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];
	} __attribute__ ((packed)) *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->chpid.id;
	scmc_area->last_chpid = chp->chpid.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;
}

int __init chsc_alloc_sei_area(void)
{
	sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!sei_page)
		CIO_MSG_EVENT(0, "Can't allocate page for processing of "
			      "chsc machine checks!\n");
	return (sei_page ? 0 : -ENOMEM);
}

void __init chsc_free_sei_area(void)
{
	kfree(sei_page);
}

int __init
chsc_enable_facility(int operation_code)
{
	int ret;
	struct {
		struct chsc_header request;
		u8 reserved1:4;
		u8 format:4;
		u8 reserved2;
		u16 operation_code;
		u32 reserved3;
		u32 reserved4;
		u32 operation_data_area[252];
		struct chsc_header response;
		u32 reserved5:4;
		u32 format2:4;
		u32 reserved6:24;
	} __attribute__ ((packed)) *sda_area;

	sda_area = (void *)get_zeroed_page(GFP_KERNEL|GFP_DMA);
	if (!sda_area)
		return -ENOMEM;
	sda_area->request.length = 0x0400;
	sda_area->request.code = 0x0031;
	sda_area->operation_code = operation_code;

	ret = chsc(sda_area);
	if (ret > 0) {
		ret = (ret == 3) ? -ENODEV : -EBUSY;
		goto out;
	}
	switch (sda_area->response.code) {
	case 0x0001: /* everything ok */
		ret = 0;
		break;
	case 0x0003: /* invalid request block */
	case 0x0007:
		ret = -EINVAL;
		break;
	case 0x0004: /* command not provided */
	case 0x0101: /* facility not provided */
		ret = -EOPNOTSUPP;
		break;
	default: /* something went wrong */
		ret = -EIO;
	}
 out:
	free_page((unsigned long)sda_area);
	return ret;
}

struct css_general_char css_general_characteristics;
struct css_chsc_char css_chsc_characteristics;

int __init
chsc_determine_css_characteristics(void)
{
	int result;
	struct {
		struct chsc_header request;
		u32 reserved1;
		u32 reserved2;
		u32 reserved3;
		struct chsc_header response;
		u32 reserved4;
		u32 general_char[510];
		u32 chsc_char[518];
	} __attribute__ ((packed)) *scsc_area;

	scsc_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
	if (!scsc_area) {
		CIO_MSG_EVENT(0, "Was not able to determine available"
			      "CHSCs due to no memory.\n");
		return -ENOMEM;
	}

	scsc_area->request.length = 0x0010;
	scsc_area->request.code = 0x0010;

	result = chsc(scsc_area);
	if (result) {
		CIO_MSG_EVENT(0, "Was not able to determine available CHSCs, "
			      "cc=%i.\n", result);
		result = -EIO;
		goto exit;
	}

	if (scsc_area->response.code != 1) {
		CIO_MSG_EVENT(0, "Was not able to determine "
			      "available CHSCs.\n");
		result = -EIO;
		goto exit;
	}
	memcpy(&css_general_characteristics, scsc_area->general_char,
	       sizeof(css_general_characteristics));
	memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
	       sizeof(css_chsc_characteristics));
exit:
	free_page ((unsigned long) scsc_area);
	return result;
}

EXPORT_SYMBOL_GPL(css_general_characteristics);
EXPORT_SYMBOL_GPL(css_chsc_characteristics);