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Commit 8c36e31d authored by John Garry's avatar John Garry Committed by Martin K. Petersen
Browse files

hisi_sas: add v2 path to send ssp frame 



Include code to prep ssp frame and deliver to hardware.

Signed-off-by: default avatarJohn Garry <john.garry@huawei.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 31a9cfa6

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

+185 −0
Original line number Diff line number Diff line
@@ -264,6 +264,11 @@ enum { 


#define HISI_SAS_COMMAND_ENTRIES_V2_HW 4096



#define DIR_NO_DATA 0

#define DIR_TO_INI 1

#define DIR_TO_DEVICE 2

#define DIR_RESERVED 3



static u32 hisi_sas_read32(struct hisi_hba *hisi_hba, u32 off)

{

	void __iomem *regs = hisi_hba->regs + off;
@@ -271,6 +276,13 @@ static u32 hisi_sas_read32(struct hisi_hba *hisi_hba, u32 off) 
	return readl(regs);

}



static u32 hisi_sas_read32_relaxed(struct hisi_hba *hisi_hba, u32 off)

{

	void __iomem *regs = hisi_hba->regs + off;



	return readl_relaxed(regs);

}



static void hisi_sas_write32(struct hisi_hba *hisi_hba, u32 off, u32 val)

{

	void __iomem *regs = hisi_hba->regs + off;
@@ -652,6 +664,176 @@ static int get_wideport_bitmap_v2_hw(struct hisi_hba *hisi_hba, int port_id) 
	return bitmap;

}



/**

 * This function allocates across all queues to load balance.

 * Slots are allocated from queues in a round-robin fashion.

 *

 * The callpath to this function and upto writing the write

 * queue pointer should be safe from interruption.

 */

static int get_free_slot_v2_hw(struct hisi_hba *hisi_hba, int *q, int *s)

{

	struct device *dev = &hisi_hba->pdev->dev;

	u32 r, w;

	int queue = hisi_hba->queue;



	while (1) {

		w = hisi_sas_read32_relaxed(hisi_hba,

					    DLVRY_Q_0_WR_PTR + (queue * 0x14));

		r = hisi_sas_read32_relaxed(hisi_hba,

					    DLVRY_Q_0_RD_PTR + (queue * 0x14));

		if (r == (w+1) % HISI_SAS_QUEUE_SLOTS) {

			queue = (queue + 1) % hisi_hba->queue_count;

			if (queue == hisi_hba->queue) {

				dev_warn(dev, "could not find free slot\n");

				return -EAGAIN;

			}

			continue;

		}

		break;

	}

	hisi_hba->queue = (queue + 1) % hisi_hba->queue_count;

	*q = queue;

	*s = w;

	return 0;

}



static void start_delivery_v2_hw(struct hisi_hba *hisi_hba)

{

	int dlvry_queue = hisi_hba->slot_prep->dlvry_queue;

	int dlvry_queue_slot = hisi_hba->slot_prep->dlvry_queue_slot;



	hisi_sas_write32(hisi_hba, DLVRY_Q_0_WR_PTR + (dlvry_queue * 0x14),

			 ++dlvry_queue_slot % HISI_SAS_QUEUE_SLOTS);

}



static int prep_prd_sge_v2_hw(struct hisi_hba *hisi_hba,

			      struct hisi_sas_slot *slot,

			      struct hisi_sas_cmd_hdr *hdr,

			      struct scatterlist *scatter,

			      int n_elem)

{

	struct device *dev = &hisi_hba->pdev->dev;

	struct scatterlist *sg;

	int i;



	if (n_elem > HISI_SAS_SGE_PAGE_CNT) {

		dev_err(dev, "prd err: n_elem(%d) > HISI_SAS_SGE_PAGE_CNT",

			n_elem);

		return -EINVAL;

	}



	slot->sge_page = dma_pool_alloc(hisi_hba->sge_page_pool, GFP_ATOMIC,

					&slot->sge_page_dma);

	if (!slot->sge_page)

		return -ENOMEM;



	for_each_sg(scatter, sg, n_elem, i) {

		struct hisi_sas_sge *entry = &slot->sge_page->sge[i];



		entry->addr = cpu_to_le64(sg_dma_address(sg));

		entry->page_ctrl_0 = entry->page_ctrl_1 = 0;

		entry->data_len = cpu_to_le32(sg_dma_len(sg));

		entry->data_off = 0;

	}



	hdr->prd_table_addr = cpu_to_le64(slot->sge_page_dma);



	hdr->sg_len = cpu_to_le32(n_elem << CMD_HDR_DATA_SGL_LEN_OFF);



	return 0;

}



static int prep_ssp_v2_hw(struct hisi_hba *hisi_hba,

			  struct hisi_sas_slot *slot, int is_tmf,

			  struct hisi_sas_tmf_task *tmf)

{

	struct sas_task *task = slot->task;

	struct hisi_sas_cmd_hdr *hdr = slot->cmd_hdr;

	struct domain_device *device = task->dev;

	struct hisi_sas_device *sas_dev = device->lldd_dev;

	struct hisi_sas_port *port = slot->port;

	struct sas_ssp_task *ssp_task = &task->ssp_task;

	struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;

	int has_data = 0, rc, priority = is_tmf;

	u8 *buf_cmd;

	u32 dw1 = 0, dw2 = 0;



	hdr->dw0 = cpu_to_le32((1 << CMD_HDR_RESP_REPORT_OFF) |

			       (2 << CMD_HDR_TLR_CTRL_OFF) |

			       (port->id << CMD_HDR_PORT_OFF) |

			       (priority << CMD_HDR_PRIORITY_OFF) |

			       (1 << CMD_HDR_CMD_OFF)); /* ssp */



	dw1 = 1 << CMD_HDR_VDTL_OFF;

	if (is_tmf) {

		dw1 |= 2 << CMD_HDR_FRAME_TYPE_OFF;

		dw1 |= DIR_NO_DATA << CMD_HDR_DIR_OFF;

	} else {

		dw1 |= 1 << CMD_HDR_FRAME_TYPE_OFF;

		switch (scsi_cmnd->sc_data_direction) {

		case DMA_TO_DEVICE:

			has_data = 1;

			dw1 |= DIR_TO_DEVICE << CMD_HDR_DIR_OFF;

			break;

		case DMA_FROM_DEVICE:

			has_data = 1;

			dw1 |= DIR_TO_INI << CMD_HDR_DIR_OFF;

			break;

		default:

			dw1 &= ~CMD_HDR_DIR_MSK;

		}

	}



	/* map itct entry */

	dw1 |= sas_dev->device_id << CMD_HDR_DEV_ID_OFF;

	hdr->dw1 = cpu_to_le32(dw1);



	dw2 = (((sizeof(struct ssp_command_iu) + sizeof(struct ssp_frame_hdr)

	      + 3) / 4) << CMD_HDR_CFL_OFF) |

	      ((HISI_SAS_MAX_SSP_RESP_SZ / 4) << CMD_HDR_MRFL_OFF) |

	      (2 << CMD_HDR_SG_MOD_OFF);

	hdr->dw2 = cpu_to_le32(dw2);



	hdr->transfer_tags = cpu_to_le32(slot->idx);



	if (has_data) {

		rc = prep_prd_sge_v2_hw(hisi_hba, slot, hdr, task->scatter,

					slot->n_elem);

		if (rc)

			return rc;

	}



	hdr->data_transfer_len = cpu_to_le32(task->total_xfer_len);

	hdr->cmd_table_addr = cpu_to_le64(slot->command_table_dma);

	hdr->sts_buffer_addr = cpu_to_le64(slot->status_buffer_dma);



	buf_cmd = slot->command_table + sizeof(struct ssp_frame_hdr);



	memcpy(buf_cmd, &task->ssp_task.LUN, 8);

	if (!is_tmf) {

		buf_cmd[9] = task->ssp_task.task_attr |

				(task->ssp_task.task_prio << 3);

		memcpy(buf_cmd + 12, task->ssp_task.cmd->cmnd,

				task->ssp_task.cmd->cmd_len);

	} else {

		buf_cmd[10] = tmf->tmf;

		switch (tmf->tmf) {

		case TMF_ABORT_TASK:

		case TMF_QUERY_TASK:

			buf_cmd[12] =

				(tmf->tag_of_task_to_be_managed >> 8) & 0xff;

			buf_cmd[13] =

				tmf->tag_of_task_to_be_managed & 0xff;

			break;

		default:

			break;

		}

	}



	return 0;

}



static int

slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot,

		    int abort)
@@ -1213,6 +1395,9 @@ static const struct hisi_sas_hw hisi_sas_v2_hw = { 
	.hw_init = hisi_sas_v2_init,

	.sl_notify = sl_notify_v2_hw,

	.get_wideport_bitmap = get_wideport_bitmap_v2_hw,

	.prep_ssp = prep_ssp_v2_hw,

	.get_free_slot = get_free_slot_v2_hw,

	.start_delivery = start_delivery_v2_hw,

	.slot_complete = slot_complete_v2_hw,

	.max_command_entries = HISI_SAS_COMMAND_ENTRIES_V2_HW,

	.complete_hdr_size = sizeof(struct hisi_sas_complete_v2_hdr),