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[PATCH] ahci: implement NCQ suppport 

Implement NCQ support.

Original implementation is from Jens Axboe.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2006-05-15 21:03:55 +09:00
parent a9764c2bb5
commit 12fad3f965
1 changed files with 58 additions and 31 deletions
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89
drivers/scsi/ahci.c
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@ -56,9 +56,9 @@ enum {
AHCI_MAX_SG = 168, /* hardware max is 64K */
AHCI_DMA_BOUNDARY = 0xffffffff,
AHCI_USE_CLUSTERING = 0,
AHCI_MAX_CMDS = 1,
AHCI_MAX_CMDS = 32,
AHCI_CMD_SZ = 32,
AHCI_CMD_SLOT_SZ = 32 * AHCI_CMD_SZ,
AHCI_CMD_SLOT_SZ = AHCI_MAX_CMDS * AHCI_CMD_SZ,
AHCI_RX_FIS_SZ = 256,
AHCI_CMD_TBL_CDB = 0x40,
AHCI_CMD_TBL_HDR_SZ = 0x80,
@ -218,7 +218,8 @@ static struct scsi_host_template ahci_sht = {
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.change_queue_depth = ata_scsi_change_queue_depth,
.can_queue = AHCI_MAX_CMDS - 1,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = AHCI_MAX_SG,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
@ -533,12 +534,17 @@ static unsigned int ahci_dev_classify(struct ata_port *ap)
return ata_dev_classify(&tf);
}
static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, u32 opts)
static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
u32 opts)
{
pp->cmd_slot[0].opts = cpu_to_le32(opts);
pp->cmd_slot[0].status = 0;
pp->cmd_slot[0].tbl_addr = cpu_to_le32(pp->cmd_tbl_dma & 0xffffffff);
pp->cmd_slot[0].tbl_addr_hi = cpu_to_le32((pp->cmd_tbl_dma >> 16) >> 16);
dma_addr_t cmd_tbl_dma;
cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
pp->cmd_slot[tag].opts = cpu_to_le32(opts);
pp->cmd_slot[tag].status = 0;
pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
}
static int ahci_clo(struct ata_port *ap)
@ -610,7 +616,8 @@ static int ahci_softreset(struct ata_port *ap, unsigned int *class)
fis = pp->cmd_tbl;
/* issue the first D2H Register FIS */
ahci_fill_cmd_slot(pp, cmd_fis_len | AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY);
ahci_fill_cmd_slot(pp, 0,
cmd_fis_len | AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY);
tf.ctl |= ATA_SRST;
ata_tf_to_fis(&tf, fis, 0);
@ -629,7 +636,7 @@ static int ahci_softreset(struct ata_port *ap, unsigned int *class)
msleep(1);
/* issue the second D2H Register FIS */
ahci_fill_cmd_slot(pp, cmd_fis_len);
ahci_fill_cmd_slot(pp, 0, cmd_fis_len);
tf.ctl &= ~ATA_SRST;
ata_tf_to_fis(&tf, fis, 0);
@ -734,9 +741,8 @@ static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
ata_tf_from_fis(d2h_fis, tf);
}
static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc)
static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
{
struct ahci_port_priv *pp = qc->ap->private_data;
struct scatterlist *sg;
struct ahci_sg *ahci_sg;
unsigned int n_sg = 0;
@ -746,7 +752,7 @@ static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc)
/*
* Next, the S/G list.
*/
ahci_sg = pp->cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
ata_for_each_sg(sg, qc) {
dma_addr_t addr = sg_dma_address(sg);
u32 sg_len = sg_dma_len(sg);
@ -767,6 +773,7 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
struct ata_port *ap = qc->ap;
struct ahci_port_priv *pp = ap->private_data;
int is_atapi = is_atapi_taskfile(&qc->tf);
void *cmd_tbl;
u32 opts;
const u32 cmd_fis_len = 5; /* five dwords */
unsigned int n_elem;
@ -775,16 +782,17 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
* Fill in command table information. First, the header,
* a SATA Register - Host to Device command FIS.
*/
ata_tf_to_fis(&qc->tf, pp->cmd_tbl, 0);
cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
ata_tf_to_fis(&qc->tf, cmd_tbl, 0);
if (is_atapi) {
memset(pp->cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
memcpy(pp->cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb,
qc->dev->cdb_len);
memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
}
n_elem = 0;
if (qc->flags & ATA_QCFLAG_DMAMAP)
n_elem = ahci_fill_sg(qc);
n_elem = ahci_fill_sg(qc, cmd_tbl);
/*
* Fill in command slot information.
@ -795,7 +803,7 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc)
if (is_atapi)
opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
ahci_fill_cmd_slot(pp, opts);
ahci_fill_cmd_slot(pp, qc->tag, opts);
}
static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
@ -865,8 +873,9 @@ static void ahci_host_intr(struct ata_port *ap)
{
void __iomem *mmio = ap->host_set->mmio_base;
void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
struct ata_queued_cmd *qc;
u32 status, ci;
struct ata_eh_info *ehi = &ap->eh_info;
u32 status, qc_active;
int rc;
status = readl(port_mmio + PORT_IRQ_STAT);
writel(status, port_mmio + PORT_IRQ_STAT);
@ -876,16 +885,27 @@ static void ahci_host_intr(struct ata_port *ap)
return;
}
if ((qc = ata_qc_from_tag(ap, ap->active_tag))) {
ci = readl(port_mmio + PORT_CMD_ISSUE);
if ((ci & 0x1) == 0) {
ata_qc_complete(qc);
return;
}
if (ap->sactive)
qc_active = readl(port_mmio + PORT_SCR_ACT);
else
qc_active = readl(port_mmio + PORT_CMD_ISSUE);
rc = ata_qc_complete_multiple(ap, qc_active, NULL);
if (rc > 0)
return;
if (rc < 0) {
ehi->err_mask |= AC_ERR_HSM;
ehi->action |= ATA_EH_SOFTRESET;
ata_port_freeze(ap);
return;
}
/* hmmm... a spurious interupt */
/* some devices send D2H reg with I bit set during NCQ command phase */
if (ap->sactive && status & PORT_IRQ_D2H_REG_FIS)
return;
/* ignore interim PIO setup fis interrupts */
if (ata_tag_valid(ap->active_tag)) {
struct ata_queued_cmd *qc =
@ -898,8 +918,8 @@ static void ahci_host_intr(struct ata_port *ap)
if (ata_ratelimit())
ata_port_printk(ap, KERN_INFO, "spurious interrupt "
"(irq_stat 0x%x active_tag %d)\n",
status, ap->active_tag);
"(irq_stat 0x%x active_tag %d sactive 0x%x)\n",
status, ap->active_tag, ap->sactive);
}
static void ahci_irq_clear(struct ata_port *ap)
@ -907,7 +927,7 @@ static void ahci_irq_clear(struct ata_port *ap)
/* TODO */
}
static irqreturn_t ahci_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
static irqreturn_t ahci_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
{
struct ata_host_set *host_set = dev_instance;
struct ahci_host_priv *hpriv;
@ -965,7 +985,9 @@ static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
struct ata_port *ap = qc->ap;
void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
writel(1, port_mmio + PORT_CMD_ISSUE);
if (qc->tf.protocol == ATA_PROT_NCQ)
writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
readl(port_mmio + PORT_CMD_ISSUE); /* flush */
return 0;
@ -1262,6 +1284,8 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
VPRINTK("ENTER\n");
WARN_ON(ATA_MAX_QUEUE > AHCI_MAX_CMDS);
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
@ -1329,6 +1353,9 @@ static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
if (rc)
goto err_out_hpriv;
if (hpriv->cap & HOST_CAP_NCQ)
probe_ent->host_flags |= ATA_FLAG_NCQ;
ahci_print_info(probe_ent);
/* FIXME: check ata_device_add return value */