[PATCH 14/25] scsi: hisi_sas: add ssp command function

John Garry
2015-10-12T15:20:26Z

Add path to send ssp command to HW.

Signed-off-by: John Garry <john.garry-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
drivers/scsi/hisi_sas/hisi_sas.h | 23 +++
drivers/scsi/hisi_sas/hisi_sas_init.c | 1 +
drivers/scsi/hisi_sas/hisi_sas_main.c | 246 +++++++++++++++++++++++++++++++++
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 206 +++++++++++++++++++++++++++
4 files changed, 476 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 802c000..908baf3 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -33,6 +33,7 @@
#define HISI_SAS_COMMAND_TABLE_SZ \
(((sizeof(union hisi_sas_command_table)+3)/4)*4)

+#define HISI_SAS_MAX_SSP_RESP_SZ (sizeof(struct ssp_frame_hdr) + 1024)
#define HISI_SAS_NAME_LEN 32
#define HISI_SAS_RESET_REG_CNT 5

@@ -109,6 +110,20 @@ struct hisi_sas_slot {
dma_addr_t sge_page_dma;
};

+struct hisi_sas_tmf_task {
+ u8 tmf;
+ u16 tag_of_task_to_be_managed;
+};
+
+struct hisi_sas_tei {
+ struct sas_task *task;
+ struct hisi_sas_cmd_hdr *hdr;
+ struct hisi_sas_port *port;
+ struct hisi_sas_slot *slot;
+ int n_elem;
+ int iptt;
+};
+
enum hisi_sas_wq_event {
PHYUP,
};
@@ -158,9 +173,11 @@ struct hisi_hba {
struct hisi_sas_cq cq[HISI_SAS_MAX_QUEUES];
struct hisi_sas_phy phy[HISI_SAS_MAX_PHYS];
struct hisi_sas_port port[HISI_SAS_MAX_PHYS];
+
int id;
int queue_count;
char *int_names;
+ struct hisi_sas_slot *slot_prep;

struct hisi_sas_device devices[HISI_SAS_MAX_DEVICES];
struct dma_pool *command_table_pool;
@@ -328,7 +345,13 @@ union hisi_sas_command_table {

void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba);
void hisi_sas_phy_init(struct hisi_hba *hisi_hba, int i);
+int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags);
void hisi_sas_wq_process(struct work_struct *work);
+extern void start_delivery_v1_hw(struct hisi_hba *hisi_hba);
+extern int get_free_slot_v1_hw(struct hisi_hba *hisi_hba, int *q, int *s);
+extern int prep_ssp_v1_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_tei *tei, int is_tmf,
+ struct hisi_sas_tmf_task *tmf);
extern int interrupt_init_v1_hw(struct hisi_hba *hisi_hba);
extern int interrupt_openall_v1_hw(struct hisi_hba *hisi_hba);
extern int hw_init_v1_hw(struct hisi_hba *hisi_hba);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_init.c b/drivers/scsi/hisi_sas/hisi_sas_init.c
index 67bfa58..c681b21 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_init.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_init.c
@@ -33,6 +33,7 @@ static struct scsi_host_template hisi_sas_sht = {
};

static struct sas_domain_function_template hisi_sas_transport_ops = {
+ .lldd_execute_task = hisi_sas_queue_command,
};

static int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 72831db..3a82262 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -12,6 +12,14 @@
#include "hisi_sas.h"

+#define DEV_IS_GONE(dev) \
+ ((!dev) || (dev->dev_type == SAS_PHY_UNUSED))
+
+static struct hisi_hba *dev_to_hisi_hba(struct domain_device *device)
+{
+ return device->port->ha->lldd_ha;
+}
+
static void hisi_sas_slot_index_clear(struct hisi_hba *hisi_hba, int slot_idx)
{
void *bitmap = hisi_hba->slot_index_tags;
@@ -19,6 +27,31 @@ static void hisi_sas_slot_index_clear(struct hisi_hba *hisi_hba, int slot_idx)
clear_bit(slot_idx, bitmap);
}

+static void hisi_sas_slot_index_free(struct hisi_hba *hisi_hba, int slot_idx)
+{
+ hisi_sas_slot_index_clear(hisi_hba, slot_idx);
+}
+
+static void hisi_sas_slot_index_set(struct hisi_hba *hisi_hba, int slot_idx)
+{
+ void *bitmap = hisi_hba->slot_index_tags;
+
+ set_bit(slot_idx, bitmap);
+}
+
+static int hisi_sas_slot_index_alloc(struct hisi_hba *hisi_hba, int *slot_idx)
+{
+ unsigned int index;
+ void *bitmap = hisi_hba->slot_index_tags;
+
+ index = find_first_zero_bit(bitmap, hisi_hba->slot_index_count);
+ if (index >= hisi_hba->slot_index_count)
+ return -SAS_QUEUE_FULL;
+ hisi_sas_slot_index_set(hisi_hba, index);
+ *slot_idx = index;
+ return 0;
+}
+
void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba)
{
int i;
@@ -28,6 +61,214 @@ void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba)
}

+static int hisi_sas_task_prep_ssp(struct hisi_hba *hisi_hba,
+ struct hisi_sas_tei *tei, int is_tmf,
+ struct hisi_sas_tmf_task *tmf)
+{
+ return prep_ssp_v1_hw(hisi_hba, tei, is_tmf, tmf);
+}
+
+static int hisi_sas_task_prep(struct sas_task *task,
+ struct hisi_hba *hisi_hba,
+ int is_tmf, struct hisi_sas_tmf_task *tmf,
+ int *pass)
+{
+ struct domain_device *device = task->dev;
+ struct hisi_sas_device *sas_dev = device->lldd_dev;
+ struct hisi_sas_tei tei;
+ struct hisi_sas_slot *slot;
+ struct hisi_sas_cmd_hdr *cmd_hdr_base;
+ struct device *dev = &hisi_hba->pdev->dev;
+ int dlvry_queue_slot, dlvry_queue, n_elem = 0, rc, slot_idx;
+
+ if (!device->port) {
+ struct task_status_struct *tsm = &task->task_status;
+
+ tsm->resp = SAS_TASK_UNDELIVERED;
+ tsm->stat = SAS_PHY_DOWN;
+ /*
+ * libsas will use dev->port, should
+ * not call task_done for sata
+ */
+ if (device->dev_type != SAS_SATA_DEV)
+ task->task_done(task);
+ return 0;
+ }
+
+ if (DEV_IS_GONE(sas_dev)) {
+ if (sas_dev)
+ dev_info(dev, "task prep: device %llu not ready\n",
+ sas_dev->device_id);
+ else
+ dev_info(dev, "task prep: device %016llx not ready\n",
+ SAS_ADDR(device->sas_addr));
+
+ rc = SAS_PHY_DOWN;
+ return rc;
+ }
+ tei.port = device->port->lldd_port;
+ if (tei.port && !tei.port->port_attached && !tmf) {
+ if (sas_protocol_ata(task->task_proto)) {
+ struct task_status_struct *ts = &task->task_status;
+
+ dev_info(dev,
+ "task prep: SATA/STP port%d not attach device\n",
+ device->port->id);
+ ts->resp = SAS_TASK_COMPLETE;
+ ts->stat = SAS_PHY_DOWN;
+ task->task_done(task);
+ } else {
+ struct task_status_struct *ts = &task->task_status;
+
+ dev_info(dev,
+ "task prep: SAS port%d does not attach device\n",
+ device->port->id);
+ ts->resp = SAS_TASK_UNDELIVERED;
+ ts->stat = SAS_PHY_DOWN;
+ task->task_done(task);
+ }
+ return 0;
+ }
+
+ if (!sas_protocol_ata(task->task_proto)) {
+ if (task->num_scatter) {
+ n_elem = dma_map_sg(dev,
+ task->scatter,
+ task->num_scatter,
+ task->data_dir);
+ if (!n_elem) {
+ rc = -ENOMEM;
+ goto prep_out;
+ }
+ }
+ } else {
+ n_elem = task->num_scatter;
+ }
+
+ rc = hisi_sas_slot_index_alloc(hisi_hba, &slot_idx);
+ if (rc)
+ goto err_out;
+ rc = get_free_slot_v1_hw(hisi_hba,
+ &dlvry_queue,
+ &dlvry_queue_slot);
+ if (rc)
+ goto err_out_tag;
+
+ slot = &hisi_hba->slot_info[slot_idx];
+ memset(slot, 0, sizeof(struct hisi_sas_slot));
+
+ task->lldd_task = NULL;
+ slot->idx = slot_idx;
+ tei.iptt = slot_idx;
+ slot->n_elem = n_elem;
+ slot->dlvry_queue = dlvry_queue;
+ slot->dlvry_queue_slot = dlvry_queue_slot;
+ cmd_hdr_base = hisi_hba->cmd_hdr[dlvry_queue];
+ slot->cmd_hdr = &cmd_hdr_base[dlvry_queue_slot];
+
+ slot->status_buffer = dma_pool_alloc(hisi_hba->status_buffer_pool,
+ GFP_ATOMIC,
+ &slot->status_buffer_dma);
+ if (!slot->status_buffer)
+ goto err_out_slot_buf;
+ memset(slot->status_buffer, 0, HISI_SAS_STATUS_BUF_SZ);
+
+ slot->command_table = dma_pool_alloc(hisi_hba->command_table_pool,
+ GFP_ATOMIC,
+ &slot->command_table_dma);
+ if (!slot->command_table)
+ goto err_out_status_buf;
+ memset(slot->command_table, 0, HISI_SAS_COMMAND_TABLE_SZ);
+ memset(slot->cmd_hdr, 0, sizeof(struct hisi_sas_cmd_hdr));
+
+ tei.hdr = slot->cmd_hdr;
+ tei.task = task;
+ tei.n_elem = n_elem;
+ tei.slot = slot;
+ switch (task->task_proto) {
+ case SAS_PROTOCOL_SSP:
+ rc = hisi_sas_task_prep_ssp(hisi_hba, &tei, is_tmf, tmf);
+ break;
+ case SAS_PROTOCOL_SMP:
+ case SAS_PROTOCOL_SATA:
+ case SAS_PROTOCOL_STP:
+ case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
+ default:
+ dev_err(dev, "task prep: unknown/unsupported proto (0x%x)\n",
+ task->task_proto);
+ rc = -EINVAL;
+ break;
+ }
+
+ if (rc) {
+ dev_err(dev, "task prep: rc = 0x%x\n", rc);
+ if (slot->sge_page)
+ goto err_out_sge;
+ goto err_out_command_table;
+ }
+
+ slot->task = task;
+ slot->port = tei.port;
+ task->lldd_task = slot;
+ list_add_tail(&slot->entry, &tei.port->list);
+ spin_lock(&task->task_state_lock);
+ task->task_state_flags |= SAS_TASK_AT_INITIATOR;
+ spin_unlock(&task->task_state_lock);
+
+ hisi_hba->slot_prep = slot;
+
+ sas_dev->running_req++;
+ ++(*pass);
+
+ return rc;
+
+err_out_sge:
+ dma_pool_free(hisi_hba->sge_page_pool, slot->sge_page,
+ slot->sge_page_dma);
+err_out_command_table:
+ dma_pool_free(hisi_hba->command_table_pool, slot->command_table,
+ slot->command_table_dma);
+err_out_status_buf:
+ dma_pool_free(hisi_hba->status_buffer_pool, slot->status_buffer,
+ slot->status_buffer_dma);
+err_out_slot_buf:
+ /* Nothing to be done */
+err_out_tag:
+ hisi_sas_slot_index_free(hisi_hba, slot_idx);
+err_out:
+ dev_err(dev, "task prep: failed[%d]!\n", rc);
+ if (!sas_protocol_ata(task->task_proto))
+ if (n_elem)
+ dma_unmap_sg(dev, task->scatter, n_elem,
+ task->data_dir);
+prep_out:
+ return rc;
+}
+
+static int hisi_sas_task_exec(struct sas_task *task,
+ gfp_t gfp_flags,
+ struct completion *completion,
+ int is_tmf,
+ struct hisi_sas_tmf_task *tmf)
+{
+ u32 rc;
+ u32 pass = 0;
+ unsigned long flags = 0;
+ struct hisi_hba *hisi_hba = dev_to_hisi_hba(task->dev);
+ struct device *dev = &hisi_hba->pdev->dev;
+
+ spin_lock_irqsave(&hisi_hba->lock, flags);
+ rc = hisi_sas_task_prep(task, hisi_hba, is_tmf, tmf, &pass);
+ if (rc)
+ dev_err(dev, "task exec: failed[%d]!\n", rc);
+
+ if (likely(pass))
+ start_delivery_v1_hw(hisi_hba);
+ spin_unlock_irqrestore(&hisi_hba->lock, flags);
+
+ return rc;
+}
+
void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no)
{
struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
@@ -112,3 +353,8 @@ void hisi_sas_phy_init(struct hisi_hba *hisi_hba, int phy_no)
sas_phy->ha = (struct sas_ha_struct *)hisi_hba->shost->hostdata;
sas_phy->lldd_phy = phy;
}
+
+int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags)
+{
+ return hisi_sas_task_exec(task, gfp_flags, NULL, 0, NULL);
+}
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index df56b3a..6e54054 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -407,6 +407,13 @@ 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)
{
@@ -751,6 +758,205 @@ void sl_notify_v1_hw(struct hisi_hba *hisi_hba, int phy_no)
hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL, sl_control);
}

+/**
+ * This function allocates across all queues to load balance.
+ * It uses the current cpu as the method to balance the
+ * queues.
+ *
+ * The callpath to this function and upto writing the write
+ * queue pointer should be safe from interruption.
+ */
+int get_free_slot_v1_hw(struct hisi_hba *hisi_hba, int *q, int *s)
+{
+ struct device *dev = &hisi_hba->pdev->dev;
+ u32 r, w;
+ int queue = smp_processor_id() % hisi_hba->queue_count;
+
+ 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) {
+ dev_warn(dev, "delivery queue%d full, r=%d w=%d\n",
+ queue, r, w);
+ queue = (queue + 1) % hisi_hba->queue_count;
+ continue;
+ }
+ break;
+ }
+
+ *q = queue;
+ *s = w;
+
+ return 0;
+}
+
+void start_delivery_v1_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_v1_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_lo = cpu_to_le32(lower_32_bits(sg_dma_address(sg)));
+ entry->addr_hi = cpu_to_le32(upper_32_bits(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_lo =
+ cpu_to_le32(lower_32_bits(slot->sge_page_dma));
+ hdr->prd_table_addr_hi =
+ cpu_to_le32(upper_32_bits(slot->sge_page_dma));
+
+ hdr->sg_len = cpu_to_le32(n_elem << CMD_HDR_DATA_SGL_LEN_OFF);
+
+ return 0;
+}
+
+
+int prep_ssp_v1_hw(struct hisi_hba *hisi_hba,
+ struct hisi_sas_tei *tei, int is_tmf,
+ struct hisi_sas_tmf_task *tmf)
+{
+ struct sas_task *task = tei->task;
+ struct hisi_sas_cmd_hdr *hdr = tei->hdr;
+ struct domain_device *device = task->dev;
+ struct hisi_sas_device *sas_dev = device->lldd_dev;
+ struct hisi_sas_port *port = tei->port;
+ struct sas_ssp_task *ssp_task = &task->ssp_task;
+ struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
+ int has_data = 0, rc;
+ struct hisi_sas_slot *slot = tei->slot;
+ u8 *buf_cmd, fburst = 0;
+ int priority = is_tmf;
+ u32 dw1, dw2;
+
+ /* create header */
+ hdr->dw0 = cpu_to_le32((1 << CMD_HDR_RESP_REPORT_OFF) |
+ (0x2 << CMD_HDR_TLR_CTRL_OFF) |
+ (port->id << CMD_HDR_PORT_OFF) |
+ (priority << CMD_HDR_PRIORITY_OFF) |
+ (1 << CMD_HDR_MODE_OFF) | /* ini mode */
+ (1 << CMD_HDR_CMD_OFF)); /* ssp */
+
+ dw1 = 1 << CMD_HDR_VERIFY_DTL_OFF;
+
+ if (is_tmf) {
+ dw1 |= 3 << CMD_HDR_SSP_FRAME_TYPE_OFF;
+ } else {
+ switch (scsi_cmnd->sc_data_direction) {
+ case DMA_TO_DEVICE:
+ dw1 |= 2 << CMD_HDR_SSP_FRAME_TYPE_OFF;
+ has_data = 1;
+ break;
+ case DMA_FROM_DEVICE:
+ dw1 |= 1 << CMD_HDR_SSP_FRAME_TYPE_OFF;
+ has_data = 1;
+ break;
+ default:
+ dw1 |= 0 << CMD_HDR_SSP_FRAME_TYPE_OFF;
+ }
+ }
+
+ /* map itct entry */
+ dw1 |= sas_dev->device_id << CMD_HDR_DEVICE_ID_OFF;
+ hdr->dw1 = cpu_to_le32(dw1);
+
+ if (is_tmf) {
+ dw2 = ((sizeof(struct ssp_tmf_iu) +
+ sizeof(struct ssp_frame_hdr)+3)/4) <<
+ CMD_HDR_CFL_OFF;
+ } else {
+ dw2 = ((sizeof(struct ssp_command_iu) +
+ sizeof(struct ssp_frame_hdr)+3)/4) <<
+ CMD_HDR_CFL_OFF;
+ }
+
+ dw2 |= (HISI_SAS_MAX_SSP_RESP_SZ/4) << CMD_HDR_MRFL_OFF;
+
+ hdr->transfer_tags = cpu_to_le32(tei->iptt << CMD_HDR_IPTT_OFF);
+
+ if (has_data) {
+ rc = prep_prd_sge_v1_hw(hisi_hba, slot, hdr, task->scatter,
+ tei->n_elem);
+ if (rc)
+ return rc;
+ }
+
+ hdr->data_transfer_len = cpu_to_le32(task->total_xfer_len);
+
+ hdr->cmd_table_addr_lo =
+ cpu_to_le32(lower_32_bits(slot->command_table_dma));
+ hdr->cmd_table_addr_hi =
+ cpu_to_le32(upper_32_bits(slot->command_table_dma));
+
+ hdr->sts_buffer_addr_lo =
+ cpu_to_le32(lower_32_bits(slot->status_buffer_dma));
+ hdr->sts_buffer_addr_hi =
+ cpu_to_le32(upper_32_bits(slot->status_buffer_dma));
+
+ buf_cmd = (u8 *)slot->command_table + sizeof(struct ssp_frame_hdr);
+ if (task->ssp_task.enable_first_burst) {
+ fburst = (1 << 7);
+ dw2 |= 1 << CMD_HDR_FIRST_BURST_OFF;
+ }
+ hdr->dw2 = cpu_to_le32(dw2);
+
+ memcpy(buf_cmd, &task->ssp_task.LUN, 8);
+ if (!is_tmf) {
+ buf_cmd[9] = fburst | 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;
+}
+
/* Interrupts */
static irqreturn_t int_phyup_v1_hw(int irq_no, void *p)
{
--
1.9.1

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