RE: [PATCH v4 5/7] scsi: ufs: Fix irq return code

From: Avri Altman
Date: Thu Nov 14 2019 - 05:43:44 EST

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In reply to: Can Guo: "[PATCH v4 5/7] scsi: ufs: Fix irq return code"
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>
> From: Venkat Gopalakrishnan <venkatg@xxxxxxxxxxxxxx>
>
> Return IRQ_HANDLED only if the irq is really handled, this will help in catching
> spurious interrupts that go unhandled.
>
> Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>

Interesting enough - did your patch exposed unhandled interrupts?
If it does - maybe you can share some info in your commit log.

Thanks,
Avri

> ---
> drivers/scsi/ufs/ufshcd.c | 134 ++++++++++++++++++++++++++++++++++-----
> -------
> drivers/scsi/ufs/ufshci.h | 2 +-
> 2 files changed, 100 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> 671ea2a..8d1b04f 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -240,7 +240,7 @@ struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
> END_FIX
> };
>
> -static void ufshcd_tmc_handler(struct ufs_hba *hba);
> +static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba);
> static void ufshcd_async_scan(void *data, async_cookie_t cookie); static int
> ufshcd_reset_and_restore(struct ufs_hba *hba); static int
> ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd); @@ -4799,19
> +4799,29 @@ static void ufshcd_slave_destroy(struct scsi_device *sdev)
> * ufshcd_uic_cmd_compl - handle completion of uic command
> * @hba: per adapter instance
> * @intr_status: interrupt status generated by the controller
> + *
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> -static void ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32 intr_status)
> +static irqreturn_t ufshcd_uic_cmd_compl(struct ufs_hba *hba, u32
> +intr_status)
> {
> + irqreturn_t retval = IRQ_NONE;
> +
> if ((intr_status & UIC_COMMAND_COMPL) && hba->active_uic_cmd) {
> hba->active_uic_cmd->argument2 |=
> ufshcd_get_uic_cmd_result(hba);
> hba->active_uic_cmd->argument3 =
> ufshcd_get_dme_attr_val(hba);
> complete(&hba->active_uic_cmd->done);
> + retval = IRQ_HANDLED;
> }
>
> - if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done)
> + if ((intr_status & UFSHCD_UIC_PWR_MASK) && hba->uic_async_done)
> + {
> complete(hba->uic_async_done);
> + retval = IRQ_HANDLED;
> + }
> + return retval;
> }
>
> /**
> @@ -4867,8 +4877,12 @@ static void __ufshcd_transfer_req_compl(struct
> ufs_hba *hba,
> /**
> * ufshcd_transfer_req_compl - handle SCSI and query command completion
> * @hba: per adapter instance
> + *
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> -static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
> +static irqreturn_t ufshcd_transfer_req_compl(struct ufs_hba *hba)
> {
> unsigned long completed_reqs;
> u32 tr_doorbell;
> @@ -4887,7 +4901,12 @@ static void ufshcd_transfer_req_compl(struct
> ufs_hba *hba)
> tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
> completed_reqs = tr_doorbell ^ hba->outstanding_reqs;
>
> - __ufshcd_transfer_req_compl(hba, completed_reqs);
> + if (completed_reqs) {
> + __ufshcd_transfer_req_compl(hba, completed_reqs);
> + return IRQ_HANDLED;
> + } else {
> + return IRQ_NONE;
> + }
> }
>
> /**
> @@ -5406,61 +5425,77 @@ static void ufshcd_err_handler(struct work_struct
> *work)
> /**
> * ufshcd_update_uic_error - check and set fatal UIC error flags.
> * @hba: per-adapter instance
> + *
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> -static void ufshcd_update_uic_error(struct ufs_hba *hba)
> +static irqreturn_t ufshcd_update_uic_error(struct ufs_hba *hba)
> {
> u32 reg;
> + irqreturn_t retval = IRQ_NONE;
>
> /* PHY layer lane error */
> reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_PHY_ADAPTER_LAYER);
> /* Ignore LINERESET indication, as this is not an error */
> if ((reg & UIC_PHY_ADAPTER_LAYER_ERROR) &&
> - (reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)) {
> + (reg & UIC_PHY_ADAPTER_LAYER_LANE_ERR_MASK)) {
> /*
> * To know whether this error is fatal or not, DB timeout
> * must be checked but this error is handled separately.
> */
> dev_dbg(hba->dev, "%s: UIC Lane error reported\n", __func__);
> ufshcd_update_reg_hist(&hba->ufs_stats.pa_err, reg);
> + retval |= IRQ_HANDLED;
> }
>
> /* PA_INIT_ERROR is fatal and needs UIC reset */
> reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DATA_LINK_LAYER);
> - if (reg)
> + if ((reg & UIC_DATA_LINK_LAYER_ERROR) &&
> + (reg & UIC_DATA_LINK_LAYER_ERROR_CODE_MASK)) {
> ufshcd_update_reg_hist(&hba->ufs_stats.dl_err, reg);
>
> - if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
> - hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;
> - else if (hba->dev_quirks &
> - UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
> - if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED)
> - hba->uic_error |=
> - UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
> - else if (reg & UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT)
> - hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR;
> + if (reg & UIC_DATA_LINK_LAYER_ERROR_PA_INIT)
> + hba->uic_error |= UFSHCD_UIC_DL_PA_INIT_ERROR;
> + else if (hba->dev_quirks &
> + UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS) {
> + if (reg & UIC_DATA_LINK_LAYER_ERROR_NAC_RECEIVED)
> + hba->uic_error |=
> + UFSHCD_UIC_DL_NAC_RECEIVED_ERROR;
> + else if (reg &
> UIC_DATA_LINK_LAYER_ERROR_TCx_REPLAY_TIMEOUT)
> + hba->uic_error |= UFSHCD_UIC_DL_TCx_REPLAY_ERROR;
> + }
> + retval |= IRQ_HANDLED;
> }
>
> /* UIC NL/TL/DME errors needs software retry */
> reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_NETWORK_LAYER);
> - if (reg) {
> + if ((reg & UIC_NETWORK_LAYER_ERROR) &&
> + (reg & UIC_NETWORK_LAYER_ERROR_CODE_MASK)) {
> ufshcd_update_reg_hist(&hba->ufs_stats.nl_err, reg);
> hba->uic_error |= UFSHCD_UIC_NL_ERROR;
> + retval |= IRQ_HANDLED;
> }
>
> reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_TRANSPORT_LAYER);
> - if (reg) {
> + if ((reg & UIC_TRANSPORT_LAYER_ERROR) &&
> + (reg & UIC_TRANSPORT_LAYER_ERROR_CODE_MASK)) {
> ufshcd_update_reg_hist(&hba->ufs_stats.tl_err, reg);
> hba->uic_error |= UFSHCD_UIC_TL_ERROR;
> + retval |= IRQ_HANDLED;
> }
>
> reg = ufshcd_readl(hba, REG_UIC_ERROR_CODE_DME);
> - if (reg) {
> + if ((reg & UIC_DME_ERROR) &&
> + (reg & UIC_DME_ERROR_CODE_MASK)) {
> ufshcd_update_reg_hist(&hba->ufs_stats.dme_err, reg);
> hba->uic_error |= UFSHCD_UIC_DME_ERROR;
> + retval |= IRQ_HANDLED;
> }
>
> dev_dbg(hba->dev, "%s: UIC error flags = 0x%08x\n",
> __func__, hba->uic_error);
> + return retval;
> }
>
> static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba, @@ -5483,10
> +5518,15 @@ static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba,
> /**
> * ufshcd_check_errors - Check for errors that need s/w attention
> * @hba: per-adapter instance
> + *
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> -static void ufshcd_check_errors(struct ufs_hba *hba)
> +static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba)
> {
> bool queue_eh_work = false;
> + irqreturn_t retval = IRQ_NONE;
>
> if (hba->errors & INT_FATAL_ERRORS) {
> ufshcd_update_reg_hist(&hba->ufs_stats.fatal_err, hba->errors); @@
> -5495,7 +5535,7 @@ static void ufshcd_check_errors(struct ufs_hba *hba)
>
> if (hba->errors & UIC_ERROR) {
> hba->uic_error = 0;
> - ufshcd_update_uic_error(hba);
> + retval = ufshcd_update_uic_error(hba);
> if (hba->uic_error)
> queue_eh_work = true;
> }
> @@ -5543,6 +5583,7 @@ static void ufshcd_check_errors(struct ufs_hba
> *hba)
> }
> schedule_work(&hba->eh_work);
> }
> + retval |= IRQ_HANDLED;
> }
> /*
> * if (!queue_eh_work) -
> @@ -5550,44 +5591,62 @@ static void ufshcd_check_errors(struct ufs_hba
> *hba)
> * itself without s/w intervention or errors that will be
> * handled by the SCSI core layer.
> */
> + return retval;
> }
>
> /**
> * ufshcd_tmc_handler - handle task management function completion
> * @hba: per adapter instance
> + *
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> -static void ufshcd_tmc_handler(struct ufs_hba *hba)
> +static irqreturn_t ufshcd_tmc_handler(struct ufs_hba *hba)
> {
> u32 tm_doorbell;
>
> tm_doorbell = ufshcd_readl(hba, REG_UTP_TASK_REQ_DOOR_BELL);
> hba->tm_condition = tm_doorbell ^ hba->outstanding_tasks;
> - wake_up(&hba->tm_wq);
> + if (hba->tm_condition) {
> + wake_up(&hba->tm_wq);
> + return IRQ_HANDLED;
> + } else {
> + return IRQ_NONE;
> + }
> }
>
> /**
> * ufshcd_sl_intr - Interrupt service routine
> * @hba: per adapter instance
> * @intr_status: contains interrupts generated by the controller
> + *
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> -static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
> +static irqreturn_t ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status)
> {
> + irqreturn_t retval = IRQ_NONE;
> +
> hba->errors = UFSHCD_ERROR_MASK & intr_status;
>
> if (ufshcd_is_auto_hibern8_error(hba, intr_status))
> hba->errors |= (UFSHCD_UIC_HIBERN8_MASK & intr_status);
>
> if (hba->errors)
> - ufshcd_check_errors(hba);
> + retval |= ufshcd_check_errors(hba);
>
> if (intr_status & UFSHCD_UIC_MASK)
> - ufshcd_uic_cmd_compl(hba, intr_status);
> + retval |= ufshcd_uic_cmd_compl(hba, intr_status);
>
> if (intr_status & UTP_TASK_REQ_COMPL)
> - ufshcd_tmc_handler(hba);
> + retval |= ufshcd_tmc_handler(hba);
>
> if (intr_status & UTP_TRANSFER_REQ_COMPL)
> - ufshcd_transfer_req_compl(hba);
> + retval |= ufshcd_transfer_req_compl(hba);
> +
> + return retval;
> }
>
> /**
> @@ -5595,8 +5654,9 @@ static void ufshcd_sl_intr(struct ufs_hba *hba, u32
> intr_status)
> * @irq: irq number
> * @__hba: pointer to adapter instance
> *
> - * Returns IRQ_HANDLED - If interrupt is valid
> - * IRQ_NONE - If invalid interrupt
> + * Returns
> + * IRQ_HANDLED - If interrupt is valid
> + * IRQ_NONE - If invalid interrupt
> */
> static irqreturn_t ufshcd_intr(int irq, void *__hba) { @@ -5619,14 +5679,18
> @@ static irqreturn_t ufshcd_intr(int irq, void *__hba)
> intr_status & ufshcd_readl(hba, REG_INTERRUPT_ENABLE);
> if (intr_status)
> ufshcd_writel(hba, intr_status, REG_INTERRUPT_STATUS);
> - if (enabled_intr_status) {
> - ufshcd_sl_intr(hba, enabled_intr_status);
> - retval = IRQ_HANDLED;
> - }
> + if (enabled_intr_status)
> + retval |= ufshcd_sl_intr(hba,
> + enabled_intr_status);
>
> intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS);
> } while (intr_status && --retries);
>
> + if (retval == IRQ_NONE) {
> + dev_err(hba->dev, "%s: Unhandled interrupt 0x%08x\n",
> + __func__, intr_status);
> + ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: ");
> + }
> +
> spin_unlock(hba->host->host_lock);
> return retval;
> }
> diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index
> dbb75cd..c2961d3 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -195,7 +195,7 @@ enum {
>
> /* UECDL - Host UIC Error Code Data Link Layer 3Ch */
> #define UIC_DATA_LINK_LAYER_ERROR 0x80000000
> -#define UIC_DATA_LINK_LAYER_ERROR_CODE_MASK 0x7FFF
> +#define UIC_DATA_LINK_LAYER_ERROR_CODE_MASK 0xFFFF
> #define UIC_DATA_LINK_LAYER_ERROR_TCX_REP_TIMER_EXP 0x2
> #define UIC_DATA_LINK_LAYER_ERROR_AFCX_REQ_TIMER_EXP 0x4
> #define UIC_DATA_LINK_LAYER_ERROR_FCX_PRO_TIMER_EXP 0x8
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

Next message: Peter Zijlstra: "Re: [PATCH v3 10/10] perf/cgroup: Do not switch system-wide events in cgroup switch"
Previous message: Chunfeng Yun: "[PATCH v3 07/13] usb: dwc2: create debugfs directory under usb root"
In reply to: Can Guo: "[PATCH v4 5/7] scsi: ufs: Fix irq return code"
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