stex.c

linux 内核源代码

	n_elem = scsi_dma_map(cmd);
	if (n_elem < 0)
		return 0;

	stex_internal_copy(cmd, src, &cp_len, n_elem, ST_TO_CMD);

	scsi_dma_unmap(cmd);

	return cp_len == count;
}

static void stex_controller_info(struct st_hba *hba, struct st_ccb *ccb)
{
	struct st_frame *p;
	size_t count = sizeof(struct st_frame);

	p = hba->copy_buffer;
	stex_internal_copy(ccb->cmd, p, &count, ccb->sg_count, ST_FROM_CMD);
	memset(p->base, 0, sizeof(u32)*6);
	*(unsigned long *)(p->base) = pci_resource_start(hba->pdev, 0);
	p->rom_addr = 0;

	p->drv_ver.major = ST_VER_MAJOR;
	p->drv_ver.minor = ST_VER_MINOR;
	p->drv_ver.oem = ST_OEM;
	p->drv_ver.build = ST_BUILD_VER;

	p->bus = hba->pdev->bus->number;
	p->slot = hba->pdev->devfn;
	p->irq_level = 0;
	p->irq_vec = hba->pdev->irq;
	p->id = hba->pdev->vendor << 16 | hba->pdev->device;
	p->subid =
		hba->pdev->subsystem_vendor << 16 | hba->pdev->subsystem_device;

	stex_internal_copy(ccb->cmd, p, &count, ccb->sg_count, ST_TO_CMD);
}

static void
stex_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
{
	req->tag = cpu_to_le16(tag);
	req->task_attr = TASK_ATTRIBUTE_SIMPLE;
	req->task_manage = 0; /* not supported yet */

	hba->ccb[tag].req = req;
	hba->out_req_cnt++;

	writel(hba->req_head, hba->mmio_base + IMR0);
	writel(MU_INBOUND_DOORBELL_REQHEADCHANGED, hba->mmio_base + IDBL);
	readl(hba->mmio_base + IDBL); /* flush */
}

static int
stex_slave_alloc(struct scsi_device *sdev)
{
	/* Cheat: usually extracted from Inquiry data */
	sdev->tagged_supported = 1;

	scsi_activate_tcq(sdev, sdev->host->can_queue);

	return 0;
}

static int
stex_slave_config(struct scsi_device *sdev)
{
	sdev->use_10_for_rw = 1;
	sdev->use_10_for_ms = 1;
	sdev->timeout = 60 * HZ;
	sdev->tagged_supported = 1;

	return 0;
}

static void
stex_slave_destroy(struct scsi_device *sdev)
{
	scsi_deactivate_tcq(sdev, 1);
}

static int
stex_queuecommand(struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
{
	struct st_hba *hba;
	struct Scsi_Host *host;
	unsigned int id,lun;
	struct req_msg *req;
	u16 tag;
	host = cmd->device->host;
	id = cmd->device->id;
	lun = cmd->device->lun;
	hba = (struct st_hba *) &host->hostdata[0];

	switch (cmd->cmnd[0]) {
	case MODE_SENSE_10:
	{
		static char ms10_caching_page[12] =
			{ 0, 0x12, 0, 0, 0, 0, 0, 0, 0x8, 0xa, 0x4, 0 };
		unsigned char page;
		page = cmd->cmnd[2] & 0x3f;
		if (page == 0x8 || page == 0x3f) {
			stex_direct_copy(cmd, ms10_caching_page,
					sizeof(ms10_caching_page));
			cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
			done(cmd);
		} else
			stex_invalid_field(cmd, done);
		return 0;
	}
	case REPORT_LUNS:
		/*
		 * The shasta firmware does not report actual luns in the
		 * target, so fail the command to force sequential lun scan.
		 * Also, the console device does not support this command.
		 */
		if (hba->cardtype == st_shasta || id == host->max_id - 1) {
			stex_invalid_field(cmd, done);
			return 0;
		}
		break;
	case TEST_UNIT_READY:
		if (id == host->max_id - 1) {
			cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
			done(cmd);
			return 0;
		}
		break;
	case INQUIRY:
		if (id != host->max_id - 1)
			break;
		if (lun == 0 && (cmd->cmnd[1] & INQUIRY_EVPD) == 0) {
			stex_direct_copy(cmd, console_inq_page,
				sizeof(console_inq_page));
			cmd->result = DID_OK << 16 | COMMAND_COMPLETE << 8;
			done(cmd);
		} else
			stex_invalid_field(cmd, done);
		return 0;
	case PASSTHRU_CMD:
		if (cmd->cmnd[1] == PASSTHRU_GET_DRVVER) {
			struct st_drvver ver;
			ver.major = ST_VER_MAJOR;
			ver.minor = ST_VER_MINOR;
			ver.oem = ST_OEM;
			ver.build = ST_BUILD_VER;
			ver.signature[0] = PASSTHRU_SIGNATURE;
			ver.console_id = host->max_id - 1;
			ver.host_no = hba->host->host_no;
			cmd->result = stex_direct_copy(cmd, &ver, sizeof(ver)) ?
				DID_OK << 16 | COMMAND_COMPLETE << 8 :
				DID_ERROR << 16 | COMMAND_COMPLETE << 8;
			done(cmd);
			return 0;
		}
	default:
		break;
	}

	cmd->scsi_done = done;

	tag = cmd->request->tag;

	if (unlikely(tag >= host->can_queue))
		return SCSI_MLQUEUE_HOST_BUSY;

	req = stex_alloc_req(hba);

	req->lun = lun;
	req->target = id;

	/* cdb */
	memcpy(req->cdb, cmd->cmnd, STEX_CDB_LENGTH);

	hba->ccb[tag].cmd = cmd;
	hba->ccb[tag].sense_bufflen = SCSI_SENSE_BUFFERSIZE;
	hba->ccb[tag].sense_buffer = cmd->sense_buffer;
	hba->ccb[tag].req_type = 0;

	if (cmd->sc_data_direction != DMA_NONE)
		stex_map_sg(hba, req, &hba->ccb[tag]);

	stex_send_cmd(hba, req, tag);
	return 0;
}

static void stex_scsi_done(struct st_ccb *ccb)
{
	struct scsi_cmnd *cmd = ccb->cmd;
	int result;

	if (ccb->srb_status == SRB_STATUS_SUCCESS ||  ccb->srb_status == 0) {
		result = ccb->scsi_status;
		switch (ccb->scsi_status) {
		case SAM_STAT_GOOD:
			result |= DID_OK << 16 | COMMAND_COMPLETE << 8;
			break;
		case SAM_STAT_CHECK_CONDITION:
			result |= DRIVER_SENSE << 24;
			break;
		case SAM_STAT_BUSY:
			result |= DID_BUS_BUSY << 16 | COMMAND_COMPLETE << 8;
			break;
		default:
			result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8;
			break;
		}
	}
	else if (ccb->srb_status & SRB_SEE_SENSE)
		result = DRIVER_SENSE << 24 | SAM_STAT_CHECK_CONDITION;
	else switch (ccb->srb_status) {
		case SRB_STATUS_SELECTION_TIMEOUT:
			result = DID_NO_CONNECT << 16 | COMMAND_COMPLETE << 8;
			break;
		case SRB_STATUS_BUSY:
			result = DID_BUS_BUSY << 16 | COMMAND_COMPLETE << 8;
			break;
		case SRB_STATUS_INVALID_REQUEST:
		case SRB_STATUS_ERROR:
		default:
			result = DID_ERROR << 16 | COMMAND_COMPLETE << 8;
			break;
	}

	cmd->result = result;
	cmd->scsi_done(cmd);
}

static void stex_copy_data(struct st_ccb *ccb,
	struct status_msg *resp, unsigned int variable)
{
	size_t count = variable;
	if (resp->scsi_status != SAM_STAT_GOOD) {
		if (ccb->sense_buffer != NULL)
			memcpy(ccb->sense_buffer, resp->variable,
				min(variable, ccb->sense_bufflen));
		return;
	}

	if (ccb->cmd == NULL)
		return;
	stex_internal_copy(ccb->cmd,
		resp->variable, &count, ccb->sg_count, ST_TO_CMD);
}

static void stex_ys_commands(struct st_hba *hba,
	struct st_ccb *ccb, struct status_msg *resp)
{
	size_t count;

	if (ccb->cmd->cmnd[0] == MGT_CMD &&
		resp->scsi_status != SAM_STAT_CHECK_CONDITION) {
		scsi_set_resid(ccb->cmd, scsi_bufflen(ccb->cmd) -
			le32_to_cpu(*(__le32 *)&resp->variable[0]));
		return;
	}

	if (resp->srb_status != 0)
		return;

	/* determine inquiry command status by DeviceTypeQualifier */
	if (ccb->cmd->cmnd[0] == INQUIRY &&
		resp->scsi_status == SAM_STAT_GOOD) {
		ST_INQ *inq_data;

		count = STEX_EXTRA_SIZE;
		stex_internal_copy(ccb->cmd, hba->copy_buffer,
			&count, ccb->sg_count, ST_FROM_CMD);
		inq_data = (ST_INQ *)hba->copy_buffer;
		if (inq_data->DeviceTypeQualifier != 0)
			ccb->srb_status = SRB_STATUS_SELECTION_TIMEOUT;
		else
			ccb->srb_status = SRB_STATUS_SUCCESS;
	}
}

static void stex_mu_intr(struct st_hba *hba, u32 doorbell)
{
	void __iomem *base = hba->mmio_base;
	struct status_msg *resp;
	struct st_ccb *ccb;
	unsigned int size;
	u16 tag;

	if (!(doorbell & MU_OUTBOUND_DOORBELL_STATUSHEADCHANGED))
		return;

	/* status payloads */
	hba->status_head = readl(base + OMR1);
	if (unlikely(hba->status_head >= MU_STATUS_COUNT)) {
		printk(KERN_WARNING DRV_NAME "(%s): invalid status head\n",
			pci_name(hba->pdev));
		return;
	}

	/*
	 * it's not a valid status payload if:
	 * 1. there are no pending requests(e.g. during init stage)
	 * 2. there are some pending requests, but the controller is in
	 *     reset status, and its type is not st_yosemite
	 * firmware of st_yosemite in reset status will return pending requests
	 * to driver, so we allow it to pass
	 */
	if (unlikely(hba->out_req_cnt <= 0 ||
			(hba->mu_status == MU_STATE_RESETTING &&
			 hba->cardtype != st_yosemite))) {
		hba->status_tail = hba->status_head;
		goto update_status;
	}

	while (hba->status_tail != hba->status_head) {
		resp = stex_get_status(hba);
		tag = le16_to_cpu(resp->tag);
		if (unlikely(tag >= hba->host->can_queue)) {
			printk(KERN_WARNING DRV_NAME
				"(%s): invalid tag\n", pci_name(hba->pdev));
			continue;
		}

		ccb = &hba->ccb[tag];
		if (hba->wait_ccb == ccb)
			hba->wait_ccb = NULL;
		if (unlikely(ccb->req == NULL)) {
			printk(KERN_WARNING DRV_NAME
				"(%s): lagging req\n", pci_name(hba->pdev));
			hba->out_req_cnt--;
			continue;
		}

		size = resp->payload_sz * sizeof(u32); /* payload size */
		if (unlikely(size < sizeof(*resp) - STATUS_VAR_LEN ||
			size > sizeof(*resp))) {
			printk(KERN_WARNING DRV_NAME "(%s): bad status size\n",
				pci_name(hba->pdev));
		} else {
			size -= sizeof(*resp) - STATUS_VAR_LEN; /* copy size */
			if (size)
				stex_copy_data(ccb, resp, size);
		}

		ccb->srb_status = resp->srb_status;
		ccb->scsi_status = resp->scsi_status;

		if (likely(ccb->cmd != NULL)) {
			if (hba->cardtype == st_yosemite)
				stex_ys_commands(hba, ccb, resp);

			if (unlikely(ccb->cmd->cmnd[0] == PASSTHRU_CMD &&
				ccb->cmd->cmnd[1] == PASSTHRU_GET_ADAPTER))
				stex_controller_info(hba, ccb);

			scsi_dma_unmap(ccb->cmd);
			stex_scsi_done(ccb);
			hba->out_req_cnt--;
		} else if (ccb->req_type & PASSTHRU_REQ_TYPE) {
			hba->out_req_cnt--;
			if (ccb->req_type & PASSTHRU_REQ_NO_WAKEUP) {
				ccb->req_type = 0;
				continue;
			}
			ccb->req_type = 0;
			if (waitqueue_active(&hba->waitq))
				wake_up(&hba->waitq);
		}
	}

update_status:
	writel(hba->status_head, base + IMR1);
	readl(base + IMR1); /* flush */
}

static irqreturn_t stex_intr(int irq, void *__hba)
{
	struct st_hba *hba = __hba;
	void __iomem *base = hba->mmio_base;
	u32 data;
	unsigned long flags;
	int handled = 0;

	spin_lock_irqsave(hba->host->host_lock, flags);

	data = readl(base + ODBL);

	if (data && data != 0xffffffff) {
		/* clear the interrupt */
		writel(data, base + ODBL);
		readl(base + ODBL); /* flush */
		stex_mu_intr(hba, data);
		handled = 1;
	}

	spin_unlock_irqrestore(hba->host->host_lock, flags);

	return IRQ_RETVAL(handled);
}

static int stex_handshake(struct st_hba *hba)
{
	void __iomem *base = hba->mmio_base;
	struct handshake_frame *h;
	dma_addr_t status_phys;
	u32 data;
	unsigned long before;

	if (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
		writel(MU_INBOUND_DOORBELL_HANDSHAKE, base + IDBL);
		readl(base + IDBL);
		before = jiffies;
		while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
			if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
				printk(KERN_ERR DRV_NAME
					"(%s): no handshake signature\n",
					pci_name(hba->pdev));
				return -1;
			}
			rmb();
			msleep(1);
		}
	}

	udelay(10);

	data = readl(base + OMR1);
	if ((data & 0xffff0000) == MU_HANDSHAKE_SIGNATURE_HALF) {
		data &= 0x0000ffff;
		if (hba->host->can_queue > data)
			hba->host->can_queue = data;
	}

	h = (struct handshake_frame *)(hba->dma_mem + MU_REQ_BUFFER_SIZE);
	h->rb_phy = cpu_to_le32(hba->dma_handle);
	h->rb_phy_hi = cpu_to_le32((hba->dma_handle >> 16) >> 16);
	h->req_sz = cpu_to_le16(sizeof(struct req_msg));
	h->req_cnt = cpu_to_le16(MU_REQ_COUNT);
	h->status_sz = cpu_to_le16(sizeof(struct status_msg));
	h->status_cnt = cpu_to_le16(MU_STATUS_COUNT);
	stex_gettime(&h->hosttime);
	h->partner_type = HMU_PARTNER_TYPE;
	if (hba->dma_size > STEX_BUFFER_SIZE) {
		h->extra_offset = cpu_to_le32(STEX_BUFFER_SIZE);
		h->extra_size = cpu_to_le32(ST_ADDITIONAL_MEM);
	} else
		h->extra_offset = h->extra_size = 0;

	status_phys = hba->dma_handle + MU_REQ_BUFFER_SIZE;
	writel(status_phys, base + IMR0);
	readl(base + IMR0);
	writel((status_phys >> 16) >> 16, base + IMR1);
	readl(base + IMR1);

	writel((status_phys >> 16) >> 16, base + OMR0); /* old fw compatible */
	readl(base + OMR0);
	writel(MU_INBOUND_DOORBELL_HANDSHAKE, base + IDBL);
	readl(base + IDBL); /* flush */

	udelay(10);
	before = jiffies;
	while (readl(base + OMR0) != MU_HANDSHAKE_SIGNATURE) {
		if (time_after(jiffies, before + MU_MAX_DELAY * HZ)) {
			printk(KERN_ERR DRV_NAME
				"(%s): no signature after handshake frame\n",
				pci_name(hba->pdev));
			return -1;
		}
		rmb();
		msleep(1);
	}

	writel(0, base + IMR0);