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scsi: hisi_sas: workaround SoC about abort timeout bug 

This patch adds a workaround solution for a SoC bug which may cause SoC
logic fatal error when disabling a PHY.  Then we find internal abort IO
timeout may occur, and the controller IO breakpoint may be corrupted.

We work around this SoC bug by optimizing the flow of disabling a PHY.

Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiaofei Tan 2017-04-10 21:21:58 +08:00 committed by Martin K. Petersen
parent 32ccba52f1
commit 819cbf1895
1 changed files with 126 additions and 1 deletions
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127
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
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@ -207,6 +207,8 @@
#define TXID_AUTO (PORT_BASE + 0xb8)
#define TXID_AUTO_CT3_OFF 1
#define TXID_AUTO_CT3_MSK (0x1 << TXID_AUTO_CT3_OFF)
#define TXID_AUTO_CTB_OFF 11
#define TXID_AUTO_CTB_MSK (0x1 << TXID_AUTO_CTB_OFF)
#define TX_HARDRST_OFF 2
#define TX_HARDRST_MSK (0x1 << TX_HARDRST_OFF)
#define RX_IDAF_DWORD0 (PORT_BASE + 0xc4)
@ -243,9 +245,17 @@
#define CHL_INT1_MSK (PORT_BASE + 0x1c4)
#define CHL_INT2_MSK (PORT_BASE + 0x1c8)
#define CHL_INT_COAL_EN (PORT_BASE + 0x1d0)
#define DMA_TX_DFX0 (PORT_BASE + 0x200)
#define DMA_TX_DFX1 (PORT_BASE + 0x204)
#define DMA_TX_DFX1_IPTT_OFF 0
#define DMA_TX_DFX1_IPTT_MSK (0xffff << DMA_TX_DFX1_IPTT_OFF)
#define DMA_TX_FIFO_DFX0 (PORT_BASE + 0x240)
#define PORT_DFX0 (PORT_BASE + 0x258)
#define LINK_DFX2 (PORT_BASE + 0X264)
#define LINK_DFX2_RCVR_HOLD_STS_OFF 9
#define LINK_DFX2_RCVR_HOLD_STS_MSK (0x1 << LINK_DFX2_RCVR_HOLD_STS_OFF)
#define LINK_DFX2_SEND_HOLD_STS_OFF 10
#define LINK_DFX2_SEND_HOLD_STS_MSK (0x1 << LINK_DFX2_SEND_HOLD_STS_OFF)
#define PHY_CTRL_RDY_MSK (PORT_BASE + 0x2b0)
#define PHYCTRL_NOT_RDY_MSK (PORT_BASE + 0x2b4)
#define PHYCTRL_DWS_RESET_MSK (PORT_BASE + 0x2b8)
@ -1194,12 +1204,127 @@ static bool is_sata_phy_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
return false;
}
static bool tx_fifo_is_empty_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
{
u32 dfx_val;
dfx_val = hisi_sas_phy_read32(hisi_hba, phy_no, DMA_TX_DFX1);
if (dfx_val & BIT(16))
return false;
return true;
}
static bool axi_bus_is_idle_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
{
int i, max_loop = 1000;
struct device *dev = &hisi_hba->pdev->dev;
u32 status, axi_status, dfx_val, dfx_tx_val;
for (i = 0; i < max_loop; i++) {
status = hisi_sas_read32_relaxed(hisi_hba,
AXI_MASTER_CFG_BASE + AM_CURR_TRANS_RETURN);
axi_status = hisi_sas_read32(hisi_hba, AXI_CFG);
dfx_val = hisi_sas_phy_read32(hisi_hba, phy_no, DMA_TX_DFX1);
dfx_tx_val = hisi_sas_phy_read32(hisi_hba,
phy_no, DMA_TX_FIFO_DFX0);
if ((status == 0x3) && (axi_status == 0x0) &&
(dfx_val & BIT(20)) && (dfx_tx_val & BIT(10)))
return true;
udelay(10);
}
dev_err(dev, "bus is not idle phy%d, axi150:0x%x axi100:0x%x port204:0x%x port240:0x%x\n",
phy_no, status, axi_status,
dfx_val, dfx_tx_val);
return false;
}
static bool wait_io_done_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
{
int i, max_loop = 1000;
struct device *dev = &hisi_hba->pdev->dev;
u32 status, tx_dfx0;
for (i = 0; i < max_loop; i++) {
status = hisi_sas_phy_read32(hisi_hba, phy_no, LINK_DFX2);
status = (status & 0x3fc0) >> 6;
if (status != 0x1)
return true;
tx_dfx0 = hisi_sas_phy_read32(hisi_hba, phy_no, DMA_TX_DFX0);
if ((tx_dfx0 & 0x1ff) == 0x2)
return true;
udelay(10);
}
dev_err(dev, "IO not done phy%d, port264:0x%x port200:0x%x\n",
phy_no, status, tx_dfx0);
return false;
}
static bool allowed_disable_phy_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
{
if (tx_fifo_is_empty_v2_hw(hisi_hba, phy_no))
return true;
if (!axi_bus_is_idle_v2_hw(hisi_hba, phy_no))
return false;
if (!wait_io_done_v2_hw(hisi_hba, phy_no))
return false;
return true;
}
static void disable_phy_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
{
u32 cfg = hisi_sas_phy_read32(hisi_hba, phy_no, PHY_CFG);
u32 cfg, axi_val, dfx0_val, txid_auto;
struct device *dev = &hisi_hba->pdev->dev;
/* Close axi bus. */
axi_val = hisi_sas_read32(hisi_hba, AXI_MASTER_CFG_BASE +
AM_CTRL_GLOBAL);
axi_val |= 0x1;
hisi_sas_write32(hisi_hba, AXI_MASTER_CFG_BASE +
AM_CTRL_GLOBAL, axi_val);
if (is_sata_phy_v2_hw(hisi_hba, phy_no)) {
if (allowed_disable_phy_v2_hw(hisi_hba, phy_no))
goto do_disable;
/* Reset host controller. */
queue_work(hisi_hba->wq, &hisi_hba->rst_work);
return;
}
dfx0_val = hisi_sas_phy_read32(hisi_hba, phy_no, PORT_DFX0);
dfx0_val = (dfx0_val & 0x1fc0) >> 6;
if (dfx0_val != 0x4)
goto do_disable;
if (!tx_fifo_is_empty_v2_hw(hisi_hba, phy_no)) {
dev_warn(dev, "phy%d, wait tx fifo need send break\n",
phy_no);
txid_auto = hisi_sas_phy_read32(hisi_hba, phy_no,
TXID_AUTO);
txid_auto |= TXID_AUTO_CTB_MSK;
hisi_sas_phy_write32(hisi_hba, phy_no, TXID_AUTO,
txid_auto);
}
do_disable:
cfg = hisi_sas_phy_read32(hisi_hba, phy_no, PHY_CFG);
cfg &= ~PHY_CFG_ENA_MSK;
hisi_sas_phy_write32(hisi_hba, phy_no, PHY_CFG, cfg);
/* Open axi bus. */
axi_val &= ~0x1;
hisi_sas_write32(hisi_hba, AXI_MASTER_CFG_BASE +
AM_CTRL_GLOBAL, axi_val);
}
static void start_phy_v2_hw(struct hisi_hba *hisi_hba, int phy_no)