hisi_sas: Add ssp command function

Add path to send ssp command to HW.

Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2015-11-18 00:50:49 +08:00 committed by Martin K. Petersen
parent 6613992197
commit 42e7a69368
3 changed files with 458 additions and 0 deletions

View file

@ -35,6 +35,8 @@
#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
@ -80,15 +82,41 @@ struct hisi_sas_cq {
struct hisi_sas_device {
enum sas_device_type dev_type;
u64 device_id;
u64 running_req;
u8 dev_status;
};
struct hisi_sas_slot {
struct list_head entry;
struct sas_task *task;
struct hisi_sas_port *port;
u64 n_elem;
int dlvry_queue;
int dlvry_queue_slot;
int idx;
void *cmd_hdr;
dma_addr_t cmd_hdr_dma;
void *status_buffer;
dma_addr_t status_buffer_dma;
void *command_table;
dma_addr_t command_table_dma;
struct hisi_sas_sge_page *sge_page;
dma_addr_t sge_page_dma;
};
struct hisi_sas_tmf_task {
u8 tmf;
u16 tag_of_task_to_be_managed;
};
struct hisi_sas_hw {
int (*hw_init)(struct hisi_hba *hisi_hba);
void (*sl_notify)(struct hisi_hba *hisi_hba, int phy_no);
int (*get_free_slot)(struct hisi_hba *hisi_hba, int *q, int *s);
void (*start_delivery)(struct hisi_hba *hisi_hba);
int (*prep_ssp)(struct hisi_hba *hisi_hba,
struct hisi_sas_slot *slot, int is_tmf,
struct hisi_sas_tmf_task *tmf);
int complete_hdr_size;
};
@ -122,7 +150,9 @@ struct hisi_hba {
struct hisi_sas_port port[HISI_SAS_MAX_PHYS];
int queue_count;
int queue;
char *int_names;
struct hisi_sas_slot *slot_prep;
struct dma_pool *sge_page_pool;
struct hisi_sas_device devices[HISI_SAS_MAX_DEVICES];

View file

@ -12,6 +12,15 @@
#include "hisi_sas.h"
#define DRV_NAME "hisi_sas"
#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 +28,31 @@ 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;
}
static void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba)
{
int i;
@ -26,6 +60,199 @@ static void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba)
for (i = 0; i < hisi_hba->slot_index_count; ++i)
hisi_sas_slot_index_clear(hisi_hba, i);
}
static int hisi_sas_task_prep_ssp(struct hisi_hba *hisi_hba,
struct hisi_sas_slot *slot, int is_tmf,
struct hisi_sas_tmf_task *tmf)
{
return hisi_hba->hw->prep_ssp(hisi_hba, slot, 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_port *port;
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 *ts = &task->task_status;
ts->resp = SAS_TASK_UNDELIVERED;
ts->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;
}
port = device->port->lldd_port;
if (port && !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 = hisi_hba->hw->get_free_slot(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));
slot->idx = 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->task = task;
slot->port = port;
task->lldd_task = 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));
switch (task->task_proto) {
case SAS_PROTOCOL_SSP:
rc = hisi_sas_task_prep_ssp(hisi_hba, slot, is_tmf, tmf);
break;
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;
}
list_add_tail(&slot->entry, &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,
int is_tmf, struct hisi_sas_tmf_task *tmf)
{
u32 rc;
u32 pass = 0;
unsigned long flags;
struct hisi_hba *hisi_hba = dev_to_hisi_hba(task->dev);
struct device *dev = &hisi_hba->pdev->dev;
/* protect task_prep and start_delivery sequence */
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))
hisi_hba->hw->start_delivery(hisi_hba);
spin_unlock_irqrestore(&hisi_hba->lock, flags);
return rc;
}
static void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no)
{
@ -100,6 +327,12 @@ static void hisi_sas_phy_init(struct hisi_hba *hisi_hba, int phy_no)
INIT_WORK(&phy->phyup_ws, hisi_sas_phyup_work);
}
static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags)
{
return hisi_sas_task_exec(task, gfp_flags, 0, NULL);
}
static struct scsi_transport_template *hisi_sas_stt;
static struct scsi_host_template hisi_sas_sht = {
@ -122,6 +355,7 @@ 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)

View file

@ -412,6 +412,13 @@ 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)
{
@ -741,6 +748,190 @@ static 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.
* 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_v1_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_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 = 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_v1_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, fburst = 0;
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(slot->idx << CMD_HDR_IPTT_OFF);
if (has_data) {
rc = prep_prd_sge_v1_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);
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)
{
@ -919,6 +1110,9 @@ static int hisi_sas_v1_init(struct hisi_hba *hisi_hba)
static const struct hisi_sas_hw hisi_sas_v1_hw = {
.hw_init = hisi_sas_v1_init,
.sl_notify = sl_notify_v1_hw,
.prep_ssp = prep_ssp_v1_hw,
.get_free_slot = get_free_slot_v1_hw,
.start_delivery = start_delivery_v1_hw,
.complete_hdr_size = sizeof(struct hisi_sas_complete_v1_hdr),
};