ipr.c

linux 内核源代码

/**
 * ipr_timeout -  An internally generated op has timed out.
 * @ipr_cmd:	ipr command struct
 *
 * This function blocks host requests and initiates an
 * adapter reset.
 *
 * Return value:
 * 	none
 **/
static void ipr_timeout(struct ipr_cmnd *ipr_cmd)
{
	unsigned long lock_flags = 0;
	struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

	ENTER;
	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

	ioa_cfg->errors_logged++;
	dev_err(&ioa_cfg->pdev->dev,
		"Adapter being reset due to command timeout.\n");

	if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)
		ioa_cfg->sdt_state = GET_DUMP;

	if (!ioa_cfg->in_reset_reload || ioa_cfg->reset_cmd == ipr_cmd)
		ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);

	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
	LEAVE;
}

/**
 * ipr_oper_timeout -  Adapter timed out transitioning to operational
 * @ipr_cmd:	ipr command struct
 *
 * This function blocks host requests and initiates an
 * adapter reset.
 *
 * Return value:
 * 	none
 **/
static void ipr_oper_timeout(struct ipr_cmnd *ipr_cmd)
{
	unsigned long lock_flags = 0;
	struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg;

	ENTER;
	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);

	ioa_cfg->errors_logged++;
	dev_err(&ioa_cfg->pdev->dev,
		"Adapter timed out transitioning to operational.\n");

	if (WAIT_FOR_DUMP == ioa_cfg->sdt_state)
		ioa_cfg->sdt_state = GET_DUMP;

	if (!ioa_cfg->in_reset_reload || ioa_cfg->reset_cmd == ipr_cmd) {
		if (ipr_fastfail)
			ioa_cfg->reset_retries += IPR_NUM_RESET_RELOAD_RETRIES;
		ipr_initiate_ioa_reset(ioa_cfg, IPR_SHUTDOWN_NONE);
	}

	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
	LEAVE;
}

/**
 * ipr_reset_reload - Reset/Reload the IOA
 * @ioa_cfg:		ioa config struct
 * @shutdown_type:	shutdown type
 *
 * This function resets the adapter and re-initializes it.
 * This function assumes that all new host commands have been stopped.
 * Return value:
 * 	SUCCESS / FAILED
 **/
static int ipr_reset_reload(struct ipr_ioa_cfg *ioa_cfg,
			    enum ipr_shutdown_type shutdown_type)
{
	if (!ioa_cfg->in_reset_reload)
		ipr_initiate_ioa_reset(ioa_cfg, shutdown_type);

	spin_unlock_irq(ioa_cfg->host->host_lock);
	wait_event(ioa_cfg->reset_wait_q, !ioa_cfg->in_reset_reload);
	spin_lock_irq(ioa_cfg->host->host_lock);

	/* If we got hit with a host reset while we were already resetting
	 the adapter for some reason, and the reset failed. */
	if (ioa_cfg->ioa_is_dead) {
		ipr_trace;
		return FAILED;
	}

	return SUCCESS;
}

/**
 * ipr_find_ses_entry - Find matching SES in SES table
 * @res:	resource entry struct of SES
 *
 * Return value:
 * 	pointer to SES table entry / NULL on failure
 **/
static const struct ipr_ses_table_entry *
ipr_find_ses_entry(struct ipr_resource_entry *res)
{
	int i, j, matches;
	const struct ipr_ses_table_entry *ste = ipr_ses_table;

	for (i = 0; i < ARRAY_SIZE(ipr_ses_table); i++, ste++) {
		for (j = 0, matches = 0; j < IPR_PROD_ID_LEN; j++) {
			if (ste->compare_product_id_byte[j] == 'X') {
				if (res->cfgte.std_inq_data.vpids.product_id[j] == ste->product_id[j])
					matches++;
				else
					break;
			} else
				matches++;
		}

		if (matches == IPR_PROD_ID_LEN)
			return ste;
	}

	return NULL;
}

/**
 * ipr_get_max_scsi_speed - Determine max SCSI speed for a given bus
 * @ioa_cfg:	ioa config struct
 * @bus:		SCSI bus
 * @bus_width:	bus width
 *
 * Return value:
 *	SCSI bus speed in units of 100KHz, 1600 is 160 MHz
 *	For a 2-byte wide SCSI bus, the maximum transfer speed is
 *	twice the maximum transfer rate (e.g. for a wide enabled bus,
 *	max 160MHz = max 320MB/sec).
 **/
static u32 ipr_get_max_scsi_speed(struct ipr_ioa_cfg *ioa_cfg, u8 bus, u8 bus_width)
{
	struct ipr_resource_entry *res;
	const struct ipr_ses_table_entry *ste;
	u32 max_xfer_rate = IPR_MAX_SCSI_RATE(bus_width);

	/* Loop through each config table entry in the config table buffer */
	list_for_each_entry(res, &ioa_cfg->used_res_q, queue) {
		if (!(IPR_IS_SES_DEVICE(res->cfgte.std_inq_data)))
			continue;

		if (bus != res->cfgte.res_addr.bus)
			continue;

		if (!(ste = ipr_find_ses_entry(res)))
			continue;

		max_xfer_rate = (ste->max_bus_speed_limit * 10) / (bus_width / 8);
	}

	return max_xfer_rate;
}

/**
 * ipr_wait_iodbg_ack - Wait for an IODEBUG ACK from the IOA
 * @ioa_cfg:		ioa config struct
 * @max_delay:		max delay in micro-seconds to wait
 *
 * Waits for an IODEBUG ACK from the IOA, doing busy looping.
 *
 * Return value:
 * 	0 on success / other on failure
 **/
static int ipr_wait_iodbg_ack(struct ipr_ioa_cfg *ioa_cfg, int max_delay)
{
	volatile u32 pcii_reg;
	int delay = 1;

	/* Read interrupt reg until IOA signals IO Debug Acknowledge */
	while (delay < max_delay) {
		pcii_reg = readl(ioa_cfg->regs.sense_interrupt_reg);

		if (pcii_reg & IPR_PCII_IO_DEBUG_ACKNOWLEDGE)
			return 0;

		/* udelay cannot be used if delay is more than a few milliseconds */
		if ((delay / 1000) > MAX_UDELAY_MS)
			mdelay(delay / 1000);
		else
			udelay(delay);

		delay += delay;
	}
	return -EIO;
}

/**
 * ipr_get_ldump_data_section - Dump IOA memory
 * @ioa_cfg:			ioa config struct
 * @start_addr:			adapter address to dump
 * @dest:				destination kernel buffer
 * @length_in_words:	length to dump in 4 byte words
 *
 * Return value:
 * 	0 on success / -EIO on failure
 **/
static int ipr_get_ldump_data_section(struct ipr_ioa_cfg *ioa_cfg,
				      u32 start_addr,
				      __be32 *dest, u32 length_in_words)
{
	volatile u32 temp_pcii_reg;
	int i, delay = 0;

	/* Write IOA interrupt reg starting LDUMP state  */
	writel((IPR_UPROCI_RESET_ALERT | IPR_UPROCI_IO_DEBUG_ALERT),
	       ioa_cfg->regs.set_uproc_interrupt_reg);

	/* Wait for IO debug acknowledge */
	if (ipr_wait_iodbg_ack(ioa_cfg,
			       IPR_LDUMP_MAX_LONG_ACK_DELAY_IN_USEC)) {
		dev_err(&ioa_cfg->pdev->dev,
			"IOA dump long data transfer timeout\n");
		return -EIO;
	}

	/* Signal LDUMP interlocked - clear IO debug ack */
	writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE,
	       ioa_cfg->regs.clr_interrupt_reg);

	/* Write Mailbox with starting address */
	writel(start_addr, ioa_cfg->ioa_mailbox);

	/* Signal address valid - clear IOA Reset alert */
	writel(IPR_UPROCI_RESET_ALERT,
	       ioa_cfg->regs.clr_uproc_interrupt_reg);

	for (i = 0; i < length_in_words; i++) {
		/* Wait for IO debug acknowledge */
		if (ipr_wait_iodbg_ack(ioa_cfg,
				       IPR_LDUMP_MAX_SHORT_ACK_DELAY_IN_USEC)) {
			dev_err(&ioa_cfg->pdev->dev,
				"IOA dump short data transfer timeout\n");
			return -EIO;
		}

		/* Read data from mailbox and increment destination pointer */
		*dest = cpu_to_be32(readl(ioa_cfg->ioa_mailbox));
		dest++;

		/* For all but the last word of data, signal data received */
		if (i < (length_in_words - 1)) {
			/* Signal dump data received - Clear IO debug Ack */
			writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE,
			       ioa_cfg->regs.clr_interrupt_reg);
		}
	}

	/* Signal end of block transfer. Set reset alert then clear IO debug ack */
	writel(IPR_UPROCI_RESET_ALERT,
	       ioa_cfg->regs.set_uproc_interrupt_reg);

	writel(IPR_UPROCI_IO_DEBUG_ALERT,
	       ioa_cfg->regs.clr_uproc_interrupt_reg);

	/* Signal dump data received - Clear IO debug Ack */
	writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE,
	       ioa_cfg->regs.clr_interrupt_reg);

	/* Wait for IOA to signal LDUMP exit - IOA reset alert will be cleared */
	while (delay < IPR_LDUMP_MAX_SHORT_ACK_DELAY_IN_USEC) {
		temp_pcii_reg =
		    readl(ioa_cfg->regs.sense_uproc_interrupt_reg);

		if (!(temp_pcii_reg & IPR_UPROCI_RESET_ALERT))
			return 0;

		udelay(10);
		delay += 10;
	}

	return 0;
}

#ifdef CONFIG_SCSI_IPR_DUMP
/**
 * ipr_sdt_copy - Copy Smart Dump Table to kernel buffer
 * @ioa_cfg:		ioa config struct
 * @pci_address:	adapter address
 * @length:			length of data to copy
 *
 * Copy data from PCI adapter to kernel buffer.
 * Note: length MUST be a 4 byte multiple
 * Return value:
 * 	0 on success / other on failure
 **/
static int ipr_sdt_copy(struct ipr_ioa_cfg *ioa_cfg,
			unsigned long pci_address, u32 length)
{
	int bytes_copied = 0;
	int cur_len, rc, rem_len, rem_page_len;
	__be32 *page;
	unsigned long lock_flags = 0;
	struct ipr_ioa_dump *ioa_dump = &ioa_cfg->dump->ioa_dump;

	while (bytes_copied < length &&
	       (ioa_dump->hdr.len + bytes_copied) < IPR_MAX_IOA_DUMP_SIZE) {
		if (ioa_dump->page_offset >= PAGE_SIZE ||
		    ioa_dump->page_offset == 0) {
			page = (__be32 *)__get_free_page(GFP_ATOMIC);

			if (!page) {
				ipr_trace;
				return bytes_copied;
			}

			ioa_dump->page_offset = 0;
			ioa_dump->ioa_data[ioa_dump->next_page_index] = page;
			ioa_dump->next_page_index++;
		} else
			page = ioa_dump->ioa_data[ioa_dump->next_page_index - 1];

		rem_len = length - bytes_copied;
		rem_page_len = PAGE_SIZE - ioa_dump->page_offset;
		cur_len = min(rem_len, rem_page_len);

		spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
		if (ioa_cfg->sdt_state == ABORT_DUMP) {
			rc = -EIO;
		} else {
			rc = ipr_get_ldump_data_section(ioa_cfg,
							pci_address + bytes_copied,
							&page[ioa_dump->page_offset / 4],
							(cur_len / sizeof(u32)));
		}
		spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);

		if (!rc) {
			ioa_dump->page_offset += cur_len;
			bytes_copied += cur_len;
		} else {
			ipr_trace;
			break;
		}
		schedule();
	}

	return bytes_copied;
}

/**
 * ipr_init_dump_entry_hdr - Initialize a dump entry header.
 * @hdr:	dump entry header struct
 *
 * Return value:
 * 	nothing
 **/
static void ipr_init_dump_entry_hdr(struct ipr_dump_entry_header *hdr)
{
	hdr->eye_catcher = IPR_DUMP_EYE_CATCHER;
	hdr->num_elems = 1;
	hdr->offset = sizeof(*hdr);
	hdr->status = IPR_DUMP_STATUS_SUCCESS;
}

/**
 * ipr_dump_ioa_type_data - Fill in the adapter type in the dump.
 * @ioa_cfg:	ioa config struct
 * @driver_dump:	driver dump struct
 *
 * Return value:
 * 	nothing
 **/
static void ipr_dump_ioa_type_data(struct ipr_ioa_cfg *ioa_cfg,
				   struct ipr_driver_dump *driver_dump)
{
	struct ipr_inquiry_page3 *ucode_vpd = &ioa_cfg->vpd_cbs->page3_data;

	ipr_init_dump_entry_hdr(&driver_dump->ioa_type_entry.hdr);
	driver_dump->ioa_type_entry.hdr.len =
		sizeof(struct ipr_dump_ioa_type_entry) -
		sizeof(struct ipr_dump_entry_header);
	driver_dump->ioa_type_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_BINARY;
	driver_dump->ioa_type_entry.hdr.id = IPR_DUMP_DRIVER_TYPE_ID;
	driver_dump->ioa_type_entry.type = ioa_cfg->type;
	driver_dump->ioa_type_entry.fw_version = (ucode_vpd->major_release << 24) |
		(ucode_vpd->card_type << 16) | (ucode_vpd->minor_release[0] << 8) |
		ucode_vpd->minor_release[1];
	driver_dump->hdr.num_entries++;
}

/**
 * ipr_dump_version_data - Fill in the driver version in the dump.
 * @ioa_cfg:	ioa config struct
 * @driver_dump:	driver dump struct
 *
 * Return value:
 * 	nothing
 **/
static void ipr_dump_version_data(struct ipr_ioa_cfg *ioa_cfg,
				  struct ipr_driver_dump *driver_dump)
{
	ipr_init_dump_entry_hdr(&driver_dump->version_entry.hdr);
	driver_dump->version_entry.hdr.len =
		sizeof(struct ipr_dump_version_entry) -
		sizeof(struct ipr_dump_entry_header);
	driver_dump->version_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_ASCII;
	driver_dump->version_entry.hdr.id = IPR_DUMP_DRIVER_VERSION_ID;
	strcpy(driver_dump->version_entry.version, IPR_DRIVER_VERSION);
	driver_dump->hdr.num_entries++;
}

/**
 * ipr_dump_trace_data - Fill in the IOA trace in the dump.
 * @ioa_cfg:	ioa config struct
 * @driver_dump:	driver dump struct
 *
 * Return value:
 * 	nothing
 **/
static void ipr_dump_trace_data(struct ipr_ioa_cfg *ioa_cfg,
				   struct ipr_driver_dump *driver_dump)
{
	ipr_init_dump_entry_hdr(&driver_dump->trace_entry.hdr);
	driver_dump->trace_entry.hdr.len =
		sizeof(struct ipr_dump_trace_entry) -
		sizeof(struct ipr_dump_entry_header);
	driver_dump->trace_entry.hdr.data_type = IPR_DUMP_DATA_TYPE_BINARY;
	driver_dump->trace_entry.hdr.id = IPR_DUMP_TRACE_ID;
	memcpy(driver_dump->trace_entry.trace, ioa_cfg->trace, IPR_TRACE_SIZE);
	d