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Subject[PATCH v4 4/5] scsi: hisi_sas: Add support for DIF feature for v3 hw
Date
From: Xiang Chen <chenxiang66@hisilicon.com>

For v3 hw, we support DIF operation for SAS, but not SATA.

This patchset adds the SW support for the described features. The main
components are as follows:
- Get DIF enablement from module param
- Fill PI fields
- Fill related to DIF in DQ and protection iu memories

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas.h | 2 +
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 122 ++++++++++++++++++++++++++++++++-
2 files changed, 121 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 912d234..5c780fe 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -268,6 +268,8 @@ struct hisi_hba {
struct pci_dev *pci_dev;
struct device *dev;

+ bool enable_dif;
+
void __iomem *regs;
void __iomem *sgpio_regs;
struct regmap *ctrl;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 44781e3..c707bb1 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -127,6 +127,8 @@
#define PHY_CTRL (PORT_BASE + 0x14)
#define PHY_CTRL_RESET_OFF 0
#define PHY_CTRL_RESET_MSK (0x1 << PHY_CTRL_RESET_OFF)
+#define CMD_HDR_PIR_OFF 8
+#define CMD_HDR_PIR_MSK (0x1 << CMD_HDR_PIR_OFF)
#define SL_CFG (PORT_BASE + 0x84)
#define AIP_LIMIT (PORT_BASE + 0x90)
#define SL_CONTROL (PORT_BASE + 0x94)
@@ -333,6 +335,16 @@
#define ITCT_HDR_RTOLT_OFF 48
#define ITCT_HDR_RTOLT_MSK (0xffffULL << ITCT_HDR_RTOLT_OFF)

+struct hisi_sas_protect_iu_v3_hw {
+ u32 dw0;
+ u32 lbrtcv;
+ u32 lbrtgv;
+ u32 dw3;
+ u32 dw4;
+ u32 dw5;
+ u32 rsv;
+};
+
struct hisi_sas_complete_v3_hdr {
__le32 dw0;
__le32 dw1;
@@ -372,9 +384,27 @@ struct hisi_sas_err_record_v3 {
((fis.command == ATA_CMD_DEV_RESET) && \
((fis.control & ATA_SRST) != 0)))

+#define T10_INSRT_EN_OFF 0
+#define T10_INSRT_EN_MSK (1 << T10_INSRT_EN_OFF)
+#define T10_RMV_EN_OFF 1
+#define T10_RMV_EN_MSK (1 << T10_RMV_EN_OFF)
+#define T10_RPLC_EN_OFF 2
+#define T10_RPLC_EN_MSK (1 << T10_RPLC_EN_OFF)
+#define T10_CHK_EN_OFF 3
+#define T10_CHK_EN_MSK (1 << T10_CHK_EN_OFF)
+#define INCR_LBRT_OFF 5
+#define INCR_LBRT_MSK (1 << INCR_LBRT_OFF)
+#define USR_DATA_BLOCK_SZ_OFF 20
+#define USR_DATA_BLOCK_SZ_MSK (0x3 << USR_DATA_BLOCK_SZ_OFF)
+#define T10_CHK_MSK_OFF 16
+
static bool hisi_sas_intr_conv;
MODULE_PARM_DESC(intr_conv, "interrupt converge enable (0-1)");

+static bool enable_dif;
+module_param(enable_dif, bool, 0444);
+MODULE_PARM_DESC(enable_dif, "DIF enable (0-1)");
+
static u32 hisi_sas_read32(struct hisi_hba *hisi_hba, u32 off)
{
void __iomem *regs = hisi_hba->regs + off;
@@ -941,6 +971,54 @@ static void prep_prd_sge_v3_hw(struct hisi_hba *hisi_hba,
hdr->sg_len = cpu_to_le32(n_elem << CMD_HDR_DATA_SGL_LEN_OFF);
}

+static void fill_prot_v3_hw(struct scsi_cmnd *scsi_cmnd,
+ struct hisi_sas_protect_iu_v3_hw *prot)
+{
+ u8 prot_type = scsi_get_prot_type(scsi_cmnd);
+ u8 prot_op = scsi_get_prot_op(scsi_cmnd);
+ unsigned int interval = scsi_prot_interval(scsi_cmnd);
+ u32 lbrt_chk_val;
+
+ if (interval == 4096)
+ lbrt_chk_val = (u32)(scsi_get_lba(scsi_cmnd) >> 3);
+ else
+ lbrt_chk_val = (u32)scsi_get_lba(scsi_cmnd);
+
+ switch (prot_op) {
+ case SCSI_PROT_READ_STRIP:
+ prot->dw0 |= (T10_RMV_EN_MSK | T10_CHK_EN_MSK);
+ prot->lbrtcv = lbrt_chk_val;
+ if (prot_type == SCSI_PROT_DIF_TYPE1)
+ prot->dw4 |= (0xc << 16);
+ else if (prot_type == SCSI_PROT_DIF_TYPE3)
+ prot->dw4 |= (0xfc << 16);
+ break;
+ case SCSI_PROT_WRITE_INSERT:
+ prot->dw0 |= T10_INSRT_EN_MSK;
+ prot->lbrtgv = lbrt_chk_val;
+ break;
+ default:
+ WARN_ONCE(1, "prot_op(0x%x) is not valid\n", prot_op);
+ break;
+ }
+
+ switch (interval) {
+ case 512:
+ break;
+ case 4096:
+ prot->dw0 |= (0x1 << USR_DATA_BLOCK_SZ_OFF);
+ break;
+ case 520:
+ prot->dw0 |= (0x2 << USR_DATA_BLOCK_SZ_OFF);
+ break;
+ default:
+ WARN_ONCE(1, "protection interval (0x%x) invalid\n", interval);
+ break;
+ }
+
+ prot->dw0 |= INCR_LBRT_MSK;
+}
+
static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
struct hisi_sas_slot *slot)
{
@@ -952,9 +1030,10 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
struct sas_ssp_task *ssp_task = &task->ssp_task;
struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
struct hisi_sas_tmf_task *tmf = slot->tmf;
+ unsigned char prot_op = scsi_get_prot_op(scsi_cmnd);
int has_data = 0, priority = !!tmf;
u8 *buf_cmd;
- u32 dw1 = 0, dw2 = 0;
+ u32 dw1 = 0, dw2 = 0, len = 0;

hdr->dw0 = cpu_to_le32((1 << CMD_HDR_RESP_REPORT_OFF) |
(2 << CMD_HDR_TLR_CTRL_OFF) |
@@ -984,7 +1063,6 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,

/* 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) |
@@ -997,7 +1075,6 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
prep_prd_sge_v3_hw(hisi_hba, slot, hdr, task->scatter,
slot->n_elem);

- hdr->data_transfer_len = cpu_to_le32(task->total_xfer_len);
hdr->cmd_table_addr = cpu_to_le64(hisi_sas_cmd_hdr_addr_dma(slot));
hdr->sts_buffer_addr = cpu_to_le64(hisi_sas_status_buf_addr_dma(slot));

@@ -1022,6 +1099,33 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
break;
}
}
+
+ if (has_data && (prot_op != SCSI_PROT_NORMAL)) {
+ struct hisi_sas_protect_iu_v3_hw prot;
+ u8 *buf_cmd_prot;
+
+ hdr->dw7 |= cpu_to_le32(1 << CMD_HDR_ADDR_MODE_SEL_OFF);
+ dw1 |= CMD_HDR_PIR_MSK;
+ buf_cmd_prot = hisi_sas_cmd_hdr_addr_mem(slot) +
+ sizeof(struct ssp_frame_hdr) +
+ sizeof(struct ssp_command_iu);
+
+ memset(&prot, 0, sizeof(struct hisi_sas_protect_iu_v3_hw));
+ fill_prot_v3_hw(scsi_cmnd, &prot);
+ memcpy(buf_cmd_prot, &prot,
+ sizeof(struct hisi_sas_protect_iu_v3_hw));
+
+ if (prot_op == SCSI_PROT_WRITE_INSERT) {
+ unsigned int interval = scsi_prot_interval(scsi_cmnd);
+ unsigned int ilog2_interval = ilog2(interval);
+
+ len = (task->total_xfer_len >> ilog2_interval) * 8;
+ }
+ }
+
+ hdr->dw1 = cpu_to_le32(dw1);
+
+ hdr->data_transfer_len = cpu_to_le32(task->total_xfer_len + len);
}

static void prep_smp_v3_hw(struct hisi_hba *hisi_hba,
@@ -2291,6 +2395,7 @@ static ssize_t intr_coal_count_v3_hw_store(struct device *dev,
hisi_hba->dev = dev;
hisi_hba->shost = shost;
SHOST_TO_SAS_HA(shost) = &hisi_hba->sha;
+ hisi_hba->enable_dif = enable_dif;

timer_setup(&hisi_hba->timer, NULL, 0);

@@ -2319,6 +2424,7 @@ static ssize_t intr_coal_count_v3_hw_store(struct device *dev,
struct asd_sas_port **arr_port;
struct sas_ha_struct *sha;
int rc, phy_nr, port_nr, i;
+ unsigned int prot;

rc = pci_enable_device(pdev);
if (rc)
@@ -2402,6 +2508,16 @@ static ssize_t intr_coal_count_v3_hw_store(struct device *dev,
if (rc)
goto err_out_register_ha;

+ prot = 0;
+ if (hisi_hba->enable_dif) {
+ dev_info(dev, "Registering for DIF type 1/2/3 protection.\n");
+ prot |= SHOST_DIF_TYPE1_PROTECTION |
+ SHOST_DIF_TYPE2_PROTECTION |
+ SHOST_DIF_TYPE3_PROTECTION;
+ }
+
+ scsi_host_set_prot(hisi_hba->shost, prot);
+
scsi_scan_host(shost);

return 0;
--
1.9.1
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