Re: [RFC PATCH 05/14] coresight: Convert coresight_timeout to use access abstraction

From: Mathieu Poirier
Date: Thu Jul 30 2020 - 14:00:43 EST

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On Wed, Jul 22, 2020 at 06:20:31PM +0100, Suzuki K Poulose wrote:
> Convert the generic routines to use the new access abstraction layer
> gradually, starting with coresigth_timeout.
>
> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> Cc: Mike Leach <mike.leach@xxxxxxxxxx>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> ---
> drivers/hwtracing/coresight/coresight-catu.c | 2 +-
> drivers/hwtracing/coresight/coresight-etb10.c | 5 +++--
> drivers/hwtracing/coresight/coresight-etm4x.c | 12 +++++++-----
> drivers/hwtracing/coresight/coresight-stm.c | 2 +-
> drivers/hwtracing/coresight/coresight-tmc.c | 9 ++++++---
> drivers/hwtracing/coresight/coresight-tpiu.c | 4 ++--
> drivers/hwtracing/coresight/coresight.c | 15 +++++++++------
> include/linux/coresight.h | 17 +++++++++++++----
> 8 files changed, 42 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index 6299ff7b8a14..30f037d4549d 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -401,7 +401,7 @@ static const struct attribute_group *catu_groups[] = {
>
> static inline int catu_wait_for_ready(struct catu_drvdata *drvdata)
> {
> - return coresight_timeout(drvdata->base,
> + return coresight_timeout(&drvdata->csdev->access,
> CATU_STATUS, CATU_STATUS_READY, 1);
> }
>
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 0f2735e15119..507f63c51be5 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -251,6 +251,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
> {
> u32 ffcr;
> struct device *dev = &drvdata->csdev->dev;
> + struct coresight_device *csdev = drvdata->csdev;
>
> CS_UNLOCK(drvdata->base);
>
> @@ -262,7 +263,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
> ffcr |= ETB_FFCR_FON_MAN;
> writel_relaxed(ffcr, drvdata->base + ETB_FFCR);
>
> - if (coresight_timeout(drvdata->base, ETB_FFCR, ETB_FFCR_BIT, 0)) {
> + if (coresight_timeout(&csdev->access, ETB_FFCR, ETB_FFCR_BIT, 0)) {
> dev_err(dev,
> "timeout while waiting for completion of Manual Flush\n");
> }
> @@ -270,7 +271,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
> /* disable trace capture */
> writel_relaxed(0x0, drvdata->base + ETB_CTL_REG);
>
> - if (coresight_timeout(drvdata->base, ETB_FFSR, ETB_FFSR_BIT, 1)) {
> + if (coresight_timeout(&csdev->access, ETB_FFSR, ETB_FFSR_BIT, 1)) {
> dev_err(dev,
> "timeout while waiting for Formatter to Stop\n");
> }
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
> index 67deb4a4e618..d78d79940fc9 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x.c
> @@ -109,6 +109,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
> int i, rc;
> struct etmv4_config *config = &drvdata->config;
> struct device *etm_dev = &drvdata->csdev->dev;
> + struct coresight_device *csdev = drvdata->csdev;
>
> CS_UNLOCK(drvdata->base);
>
> @@ -122,7 +123,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
> writel_relaxed(0, drvdata->base + TRCPRGCTLR);
>
> /* wait for TRCSTATR.IDLE to go up */
> - if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
> + if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1))
> dev_err(etm_dev,
> "timeout while waiting for Idle Trace Status\n");
>
> @@ -209,7 +210,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
> writel_relaxed(1, drvdata->base + TRCPRGCTLR);
>
> /* wait for TRCSTATR.IDLE to go back down to '0' */
> - if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
> + if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 0))
> dev_err(etm_dev,
> "timeout while waiting for Idle Trace Status\n");
>
> @@ -474,6 +475,7 @@ static void etm4_disable_hw(void *info)
> struct etmv4_drvdata *drvdata = info;
> struct etmv4_config *config = &drvdata->config;
> struct device *etm_dev = &drvdata->csdev->dev;
> + struct coresight_device *csdev = drvdata->csdev;
> int i;
>
> CS_UNLOCK(drvdata->base);
> @@ -500,7 +502,7 @@ static void etm4_disable_hw(void *info)
> writel_relaxed(control, drvdata->base + TRCPRGCTLR);
>
> /* wait for TRCSTATR.PMSTABLE to go to '1' */
> - if (coresight_timeout(drvdata->base, TRCSTATR,
> + if (coresight_timeout(&csdev->access, TRCSTATR,
> TRCSTATR_PMSTABLE_BIT, 1))
> dev_err(etm_dev,
> "timeout while waiting for PM stable Trace Status\n");
> @@ -1163,7 +1165,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
> etm4_os_lock(drvdata);
>
> /* wait for TRCSTATR.PMSTABLE to go up */
> - if (coresight_timeout(drvdata->base, TRCSTATR,
> + if (coresight_timeout(&csdev->access, TRCSTATR,
> TRCSTATR_PMSTABLE_BIT, 1)) {
> dev_err(etm_dev,
> "timeout while waiting for PM Stable Status\n");
> @@ -1247,7 +1249,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
> state->trcpdcr = readl(drvdata->base + TRCPDCR);
>
> /* wait for TRCSTATR.IDLE to go up */
> - if (coresight_timeout(drvdata->base, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
> + if (coresight_timeout(&csdev->access, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) {
> dev_err(etm_dev,
> "timeout while waiting for Idle Trace Status\n");
> etm4_os_unlock(drvdata);
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index c8509cc78512..b704000c96b8 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -270,7 +270,7 @@ static void stm_disable(struct coresight_device *csdev,
> spin_unlock(&drvdata->spinlock);
>
> /* Wait until the engine has completely stopped */
> - coresight_timeout(drvdata->base, STMTCSR, STMTCSR_BUSY_BIT, 0);
> + coresight_timeout(&csdev->access, STMTCSR, STMTCSR_BUSY_BIT, 0);
>
> pm_runtime_put(csdev->dev.parent);
>
> diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
> index b49795ad6861..6036eb73dce8 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc.c
> @@ -33,16 +33,19 @@ DEFINE_CORESIGHT_DEVLIST(etr_devs, "tmc_etr");
>
> void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
> {
> + struct coresight_device *csdev = drvdata->csdev;
> +
> /* Ensure formatter, unformatter and hardware fifo are empty */
> - if (coresight_timeout(drvdata->base,
> + if (coresight_timeout(&csdev->access,
> TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
> - dev_err(&drvdata->csdev->dev,
> + dev_err(&csdev->dev,
> "timeout while waiting for TMC to be Ready\n");
> }
> }
>
> void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
> {
> + struct coresight_device *csdev = drvdata->csdev;
> u32 ffcr;
>
> ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
> @@ -51,7 +54,7 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
> ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
> writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
> /* Ensure flush completes */
> - if (coresight_timeout(drvdata->base,
> + if (coresight_timeout(&csdev->access,
> TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
> dev_err(&drvdata->csdev->dev,
> "timeout while waiting for completion of Manual Flush\n");
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index 84ff4bf5d3b8..282d80e97265 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -86,9 +86,9 @@ static void tpiu_disable_hw(struct csdev_access *csa)
> /* Generate manual flush */
> csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
> /* Wait for flush to complete */
> - coresight_timeout(csa->base, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
> + coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
> /* Wait for formatter to stop */
> - coresight_timeout(csa->base, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
> + coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
>
> CS_LOCK(csa->base);
> }
> diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
> index 38e9c03ab754..21e7615fcbc8 100644
> --- a/drivers/hwtracing/coresight/coresight.c
> +++ b/drivers/hwtracing/coresight/coresight.c
> @@ -1338,23 +1338,26 @@ static void coresight_remove_conns(struct coresight_device *csdev)
> }
>
> /**
> - * coresight_timeout - loop until a bit has changed to a specific state.
> - * @addr: base address of the area of interest.
> - * @offset: address of a register, starting from @addr.
> + * coresight_timeout - loop until a bit has changed to a specific register
> + * state.
> + * @csa: coresight device access for the device
> + * @offset: Offset of the register from the base of the device.
> * @position: the position of the bit of interest.
> * @value: the value the bit should have.
> *
> * Return: 0 as soon as the bit has taken the desired state or -EAGAIN if
> * TIMEOUT_US has elapsed, which ever happens first.
> */
> -
> -int coresight_timeout(void __iomem *addr, u32 offset, int position, int value)
> +int coresight_timeout(struct csdev_access *csa,
> + u32 offset,
> + int position,
> + int value)
> {
> int i;
> u32 val;
>
> for (i = TIMEOUT_US; i > 0; i--) {
> - val = __raw_readl(addr + offset);
> + val = csdev_access_read32(csa, offset);

Here we are moving to a memory barrier access, which is probably not a bad
thing.

> /* waiting on the bit to go from 0 to 1 */
> if (value) {
> if (val & BIT(position))
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 81ac708689f8..2989306f6041 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -433,8 +433,10 @@ coresight_register(struct coresight_desc *desc);
> extern void coresight_unregister(struct coresight_device *csdev);
> extern int coresight_enable(struct coresight_device *csdev);
> extern void coresight_disable(struct coresight_device *csdev);
> -extern int coresight_timeout(void __iomem *addr, u32 offset,
> - int position, int value);
> +extern int coresight_timeout(struct csdev_access *csa,
> + u32 offset,
> + int position,
> + int value);
>
> extern int coresight_claim_device(void __iomem *base);
> extern int coresight_claim_device_unlocked(void __iomem *base);
> @@ -460,8 +462,15 @@ static inline void coresight_unregister(struct coresight_device *csdev) {}
> static inline int
> coresight_enable(struct coresight_device *csdev) { return -ENOSYS; }
> static inline void coresight_disable(struct coresight_device *csdev) {}
> -static inline int coresight_timeout(void __iomem *addr, u32 offset,
> - int position, int value) { return 1; }
> +
> +static inline int coresight_timeout(struct csdev_access *csa,
> + u32 offset,
> + int position,
> + int value)
> +{
> + return 1;
> +}

Reviewed-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>

> +
> static inline int coresight_claim_device_unlocked(void __iomem *base)
> {
> return -EINVAL;
> --
> 2.24.1
>

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