[SCSI] qla4xxx: add bsg support

This patch adds bsg support to qla4xxx.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Harish Zunjarrao <harish.zunjarrao@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 209 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_bsg.c b/drivers/scsi/qla4xxx/ql4_bsg.c
new file mode 100644
index 000000000000..daa2b0f8e309
--- /dev/null
+++ b/drivers/scsi/qla4xxx/ql4_bsg.c
@@ -0,0 +1,209 @@
+/*
+ * QLogic iSCSI HBA Driver
+ * Copyright (c) 2011 QLogic Corporation
+ *
+ * See LICENSE.qla4xxx for copyright and licensing details.
+ */
+
+#include "ql4_def.h"
+#include "ql4_glbl.h"
+#include "ql4_bsg.h"
+
+static int
+qla4xxx_read_flash(struct bsg_job *bsg_job)
+{
+	struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+	struct scsi_qla_host *ha = to_qla_host(host);
+	struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+	struct iscsi_bsg_request *bsg_req = bsg_job->request;
+	uint32_t sg_cnt;
+	uint32_t offset = 0;
+	uint32_t length = 0;
+	dma_addr_t flash_dma;
+	uint8_t *flash = NULL;
+	int rval = 0;
+
+	bsg_reply->reply_payload_rcv_len = 0;
+
+	if (unlikely(pci_channel_offline(ha->pdev)))
+		return -EINVAL;
+
+	if (ha->flash_state != QLFLASH_WAITING)
+		return -EBUSY;
+
+	/* TODO: Add check for adapter online, reset active?? */
+	sg_cnt = dma_map_sg(&ha->pdev->dev, bsg_job->reply_payload.sg_list,
+			    bsg_job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+
+	if (!sg_cnt)
+		return -ENOMEM;
+
+	if (sg_cnt != bsg_job->reply_payload.sg_cnt) {
+		ql4_printk(KERN_ERR, ha, "dma mapping resulted in different"
+			   " sg counts, sg_cnt: %x dma_sg_cnt: %x\n",
+			   bsg_job->reply_payload.sg_cnt, sg_cnt);
+		rval = -EAGAIN;
+		goto unmap_sg;
+	}
+
+	offset = bsg_req->rqst_data.h_vendor.vendor_cmd[1];
+	length = bsg_job->reply_payload.payload_len;
+
+	flash = dma_alloc_coherent(&ha->pdev->dev, length, &flash_dma,
+				   GFP_KERNEL);
+	if (!flash) {
+		ql4_printk(KERN_ERR, ha, "%s: dma alloc failed for flash "
+			   "data\n", __func__);
+		rval = -ENOMEM;
+		goto unmap_sg;
+	}
+
+	ha->flash_state = QLFLASH_READING;
+	if (qla4xxx_get_flash(ha, flash_dma, offset, length))
+		bsg_reply->result = (DID_ERROR << 16);
+	else {
+		sg_copy_from_buffer(bsg_job->reply_payload.sg_list,
+				    bsg_job->reply_payload.sg_cnt,
+				    flash, length);
+
+		bsg_reply->result = DID_OK;
+		bsg_reply->reply_payload_rcv_len = length;
+	}
+
+	if (flash)
+		dma_free_coherent(&ha->pdev->dev, length, flash, flash_dma);
+
+	ha->flash_state = QLFLASH_WAITING;
+unmap_sg:
+	dma_unmap_sg(&ha->pdev->dev, bsg_job->reply_payload.sg_list,
+		     bsg_job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
+	if (!rval)
+		bsg_job_done(bsg_job, bsg_reply->result,
+			     bsg_reply->reply_payload_rcv_len);
+	return rval;
+}
+
+static int
+qla4xxx_update_flash(struct bsg_job *bsg_job)
+{
+	struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+	struct scsi_qla_host *ha = to_qla_host(host);
+	struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+	struct iscsi_bsg_request *bsg_req = bsg_job->request;
+	uint32_t sg_cnt;
+	uint32_t length = 0;
+	uint32_t offset = 0;
+	uint32_t options = 0;
+	dma_addr_t flash_dma;
+	uint8_t *flash = NULL;
+	int rval = 0;
+
+	bsg_reply->reply_payload_rcv_len = 0;
+
+	if (unlikely(pci_channel_offline(ha->pdev)))
+		return -EINVAL;
+
+	if (ha->flash_state != QLFLASH_WAITING)
+		return -EBUSY;
+
+	sg_cnt = dma_map_sg(&ha->pdev->dev, bsg_job->request_payload.sg_list,
+			    bsg_job->request_payload.sg_cnt, DMA_TO_DEVICE);
+
+	if (!sg_cnt)
+		return -ENOMEM;
+
+	if (sg_cnt != bsg_job->request_payload.sg_cnt) {
+		ql4_printk(KERN_ERR, ha, "dma mapping resulted in different "
+			   "sg counts request_sg_cnt: %x dma_request_sg_cnt: "
+			   "%x\n", bsg_job->request_payload.sg_cnt, sg_cnt);
+		rval = -EAGAIN;
+		goto unmap_sg;
+	}
+
+	length = bsg_job->request_payload.payload_len;
+	offset = bsg_req->rqst_data.h_vendor.vendor_cmd[1];
+	options = bsg_req->rqst_data.h_vendor.vendor_cmd[2];
+
+	flash = dma_alloc_coherent(&ha->pdev->dev, length, &flash_dma,
+				   GFP_KERNEL);
+	if (!flash) {
+		ql4_printk(KERN_ERR, ha, "%s: dma alloc failed for flash "
+			   "data\n", __func__);
+		rval = -ENOMEM;
+		goto unmap_sg;
+	}
+
+	ha->flash_state = QLFLASH_WRITING;
+	sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+			  bsg_job->request_payload.sg_cnt, flash, length);
+
+	if (qla4xxx_set_flash(ha, flash_dma, offset, length, options))
+		bsg_reply->result = (DID_ERROR << 16);
+	else {
+		bsg_reply->result = DID_OK;
+		bsg_reply->reply_payload_rcv_len = length;
+	}
+
+	if (flash)
+		dma_free_coherent(&ha->pdev->dev, length, flash, flash_dma);
+	ha->flash_state = QLFLASH_WAITING;
+unmap_sg:
+	dma_unmap_sg(&ha->pdev->dev, bsg_job->reply_payload.sg_list,
+		     bsg_job->reply_payload.sg_cnt, DMA_TO_DEVICE);
+
+	if (!rval)
+		bsg_job_done(bsg_job, bsg_reply->result,
+			     bsg_reply->reply_payload_rcv_len);
+	return rval;
+}
+
+/**
+ * qla4xxx_process_vendor_specific - handle vendor specific bsg request
+ * @job: iscsi_bsg_job to handle
+ **/
+int qla4xxx_process_vendor_specific(struct bsg_job *bsg_job)
+{
+	struct iscsi_bsg_reply *bsg_reply = bsg_job->reply;
+	struct iscsi_bsg_request *bsg_req = bsg_job->request;
+	struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+	struct scsi_qla_host *ha = to_qla_host(host);
+
+	switch (bsg_req->rqst_data.h_vendor.vendor_cmd[0]) {
+	case QLISCSI_VND_READ_FLASH:
+		return qla4xxx_read_flash(bsg_job);
+
+	case QLISCSI_VND_UPDATE_FLASH:
+		return qla4xxx_update_flash(bsg_job);
+
+	default:
+		ql4_printk(KERN_ERR, ha, "%s: invalid BSG vendor command: "
+			   "0x%x\n", __func__, bsg_req->msgcode);
+		bsg_reply->result = (DID_ERROR << 16);
+		bsg_reply->reply_payload_rcv_len = 0;
+		bsg_job_done(bsg_job, bsg_reply->result,
+			     bsg_reply->reply_payload_rcv_len);
+		return -ENOSYS;
+	}
+}
+
+/**
+ * qla4xxx_bsg_request - handle bsg request from ISCSI transport
+ * @job: iscsi_bsg_job to handle
+ */
+int qla4xxx_bsg_request(struct bsg_job *bsg_job)
+{
+	struct iscsi_bsg_request *bsg_req = bsg_job->request;
+	struct Scsi_Host *host = iscsi_job_to_shost(bsg_job);
+	struct scsi_qla_host *ha = to_qla_host(host);
+
+	switch (bsg_req->msgcode) {
+	case ISCSI_BSG_HST_VENDOR:
+		return qla4xxx_process_vendor_specific(bsg_job);
+
+	default:
+		ql4_printk(KERN_ERR, ha, "%s: invalid BSG command: 0x%x\n",
+			   __func__, bsg_req->msgcode);
+	}
+
+	return -ENOSYS;
+}