[PATCH v2 0/2] remoteproc: core: Add core functionality to the remoteproc framework

[PATCH v2 0/2] remoteproc: core: Add core functionality to the remoteproc framework

[Siddharth Gupta]

This patch series adds core functionality to the remoteproc framework.

Patch 1 adds a new API to the framework which allows kernel clients to update
        the firmware name for the specified remoteproc.
Patch 2 intends to improve the user experience by preventing the system from
        going to sleep while the remoteproc is recovering from a crash.

Changes since v1:
- The API in patch 1 has been modified based on comments by Mathieu [1]. Since
  this patch cannot be merged in without a user this is more of a RFC for
  merging in later once a user is upstreamed.
- In patch 2 updated the device being used to the parent device of the rproc,
  based on comments from Mathieu [2] and Bjorn [3].

[1]: https://lore.kernel.org/linux-arm-msm/1582164713-6413-1-git-send-email-sidgup@codeaurora.org/T/#mc36cf66598238a67d1a3e77ab8362b90bd56882e
[2]: https://lore.kernel.org/linux-arm-msm/1582164713-6413-1-git-send-email-sidgup@codeaurora.org/T/#mbafae326ff7e0e5dd1ba5370355affe042a4e21f
[3]: https://lore.kernel.org/linux-arm-msm/1582164713-6413-1-git-send-email-sidgup@codeaurora.org/T/#m4694a60c2c6c720ff6eb3c83008373dfe18ea06b

Siddharth Gupta (2):
  remoteproc: core: Add an API for changing firmware name
  remoteproc: core: Prevent sleep when rproc crashes

 drivers/remoteproc/qcom_q6v5_pas.c   |  1 +
 drivers/remoteproc/remoteproc_core.c | 47 ++++++++++++++++++++++++++++++++++++
 include/linux/remoteproc.h           |  1 +
 3 files changed, 49 insertions(+)

-- 
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[PATCH v2 1/2] remoteproc: core: Add an API for changing firmware name

[Siddharth Gupta]

Add an API which allows to change the name of the firmware to be booted on
the specified rproc. This change gives us the flixibility to change the
firmware at run-time depending on the usecase. Some remoteprocs might use
a different firmware for testing, production and development purposes,
which may be selected based on the fuse settings during bootup.

Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
---
 drivers/remoteproc/remoteproc_core.c | 43 ++++++++++++++++++++++++++++++++++++
 include/linux/remoteproc.h           |  1 +
 2 files changed, 44 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index fb9c813..9f99fe2 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1796,6 +1796,49 @@ int rproc_boot(struct rproc *rproc)
 EXPORT_SYMBOL(rproc_boot);
 
 /**
+ * rproc_set_firmware_name() - change the firmware name for specified remoteproc
+ * @rproc: handle of a remote processor
+ * @firmware: name of the firmware to boot with
+ *
+ * Change the name of the firmware to be loaded to @firmware in the rproc
+ * structure. We should ensure that the remoteproc is not running.
+ *
+ * Returns 0 on success, and an appropriate error value otherwise.
+ */
+int rproc_set_firmware_name(struct rproc *rproc, const char *firmware)
+{
+	int len, ret = 0;
+	char *p;
+
+	if (!rproc || !firmware)
+		return -EINVAL;
+
+	len = strcspn(firmware, "\n");
+	if (!len)
+		return -EINVAL;
+
+	mutex_lock(&rproc->lock);
+
+	if (rproc->state != RPROC_OFFLINE) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	p = kstrndup(firmware, len, GFP_KERNEL);
+	if (!p) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	kfree(rproc->firmware);
+	rproc->firmware = p;
+out:
+	mutex_unlock(&rproc->lock);
+	return ret;
+}
+EXPORT_SYMBOL(rproc_set_firmware_name);
+
+/**
  * rproc_shutdown() - power off the remote processor
  * @rproc: the remote processor
  *
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 9c07d79..c5d36e6 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -613,6 +613,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
 			     u32 da, const char *name, ...);
 
 int rproc_boot(struct rproc *rproc);
+int rproc_set_firmware_name(struct rproc *rproc, const char *firmware);
 void rproc_shutdown(struct rproc *rproc);
 void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
 int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size);
-- 
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a Linux Foundation Collaborative Project

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[PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

[Siddharth Gupta]

Remoteproc recovery should be fast and any delay will have an impact on the
user-experience. Add a wakeup source to remoteproc which ensures that the
system does not go into idle state while a remoteproc is recovering, thus
prevent any delays that might occur during system resume.

Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
---
 drivers/remoteproc/qcom_q6v5_pas.c   | 1 +
 drivers/remoteproc/remoteproc_core.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index 7a63efb..6bb2c7d 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -401,6 +401,7 @@ static int adsp_probe(struct platform_device *pdev)
 
 	adsp = (struct qcom_adsp *)rproc->priv;
 	adsp->dev = &pdev->dev;
+	device_wakeup_enable(adsp->dev);
 	adsp->rproc = rproc;
 	adsp->pas_id = desc->pas_id;
 	adsp->has_aggre2_clk = desc->has_aggre2_clk;
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 9f99fe2..19a360d 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1729,6 +1729,8 @@ static void rproc_crash_handler_work(struct work_struct *work)
 
 	if (!rproc->recovery_disabled)
 		rproc_trigger_recovery(rproc);
+
+	pm_relax(rproc->dev.parent);
 }
 
 /**
@@ -2273,6 +2275,8 @@ void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
 		return;
 	}
 
+	pm_stay_awake(rproc->dev.parent);
+
 	dev_err(&rproc->dev, "crash detected in %s: type %s\n",
 		rproc->name, rproc_crash_to_string(type));
 
-- 
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a Linux Foundation Collaborative Project

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Re: [PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

[Bjorn Andersson]

On Wed 08 Apr 15:18 PDT 2020, Siddharth Gupta wrote:

> Remoteproc recovery should be fast and any delay will have an impact on the
> user-experience. Add a wakeup source to remoteproc which ensures that the
> system does not go into idle state while a remoteproc is recovering, thus
> prevent any delays that might occur during system resume.
> 

This is better, but I think it can be reworded further to show that it's
not a matter of making it "fast", it's a matter of preventing suspend
from interrupting the recovery of a remoteproc.

> Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_pas.c   | 1 +
>  drivers/remoteproc/remoteproc_core.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index 7a63efb..6bb2c7d 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -401,6 +401,7 @@ static int adsp_probe(struct platform_device *pdev)
>  
>  	adsp = (struct qcom_adsp *)rproc->priv;
>  	adsp->dev = &pdev->dev;
> +	device_wakeup_enable(adsp->dev);

Move this 5 lines down and give it an empty line before and after.

>  	adsp->rproc = rproc;
>  	adsp->pas_id = desc->pas_id;
>  	adsp->has_aggre2_clk = desc->has_aggre2_clk;
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 9f99fe2..19a360d 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1729,6 +1729,8 @@ static void rproc_crash_handler_work(struct work_struct *work)
>  
>  	if (!rproc->recovery_disabled)
>  		rproc_trigger_recovery(rproc);
> +
> +	pm_relax(rproc->dev.parent);
>  }
>  
>  /**
> @@ -2273,6 +2275,8 @@ void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
>  		return;
>  	}
>  

	/* Prevent suspend while the remoteproc is being recovered */


PS. This patch is unrelated to patch 1/2, so please resubmit it
separately.

Regards,
Bjorn

> +	pm_stay_awake(rproc->dev.parent);
> +
>  	dev_err(&rproc->dev, "crash detected in %s: type %s\n",
>  		rproc->name, rproc_crash_to_string(type));
>  
> -- 
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> a Linux Foundation Collaborative Project

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Re: [PATCH v2 1/2] remoteproc: core: Add an API for changing firmware name

[Mathieu Poirier]

Hi Siddharth,

On Wed, Apr 08, 2020 at 03:18:24PM -0700, Siddharth Gupta wrote:
> Add an API which allows to change the name of the firmware to be booted on
> the specified rproc. This change gives us the flixibility to change the
> firmware at run-time depending on the usecase. Some remoteprocs might use
> a different firmware for testing, production and development purposes,
> which may be selected based on the fuse settings during bootup.
> 
> Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
> ---
>  drivers/remoteproc/remoteproc_core.c | 43 ++++++++++++++++++++++++++++++++++++
>  include/linux/remoteproc.h           |  1 +
>  2 files changed, 44 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index fb9c813..9f99fe2 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1796,6 +1796,49 @@ int rproc_boot(struct rproc *rproc)
>  EXPORT_SYMBOL(rproc_boot);
>  
>  /**
> + * rproc_set_firmware_name() - change the firmware name for specified remoteproc
> + * @rproc: handle of a remote processor
> + * @firmware: name of the firmware to boot with
> + *
> + * Change the name of the firmware to be loaded to @firmware in the rproc
> + * structure. We should ensure that the remoteproc is not running.
> + *
> + * Returns 0 on success, and an appropriate error value otherwise.
> + */
> +int rproc_set_firmware_name(struct rproc *rproc, const char *firmware)
> +{
> +	int len, ret = 0;
> +	char *p;
> +
> +	if (!rproc || !firmware)
> +		return -EINVAL;
> +
> +	len = strcspn(firmware, "\n");
> +	if (!len)
> +		return -EINVAL;
> +
> +	mutex_lock(&rproc->lock);
> +
> +	if (rproc->state != RPROC_OFFLINE) {
> +		ret = -EBUSY;
> +		goto out;
> +	}
> +
> +	p = kstrndup(firmware, len, GFP_KERNEL);
> +	if (!p) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	kfree(rproc->firmware);
> +	rproc->firmware = p;
> +out:
> +	mutex_unlock(&rproc->lock);
> +	return ret;
> +}
> +EXPORT_SYMBOL(rproc_set_firmware_name);
> +

This is much better, thanks for cleaning things up. Keep in mind that when you
do resend this rproc->firmware will likely have become a "const char *",
requiring the use of kstrndup_const()...  But that is for a later time.  

Mathieu

> +/**
>   * rproc_shutdown() - power off the remote processor
>   * @rproc: the remote processor
>   *
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 9c07d79..c5d36e6 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -613,6 +613,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
>  			     u32 da, const char *name, ...);
>  
>  int rproc_boot(struct rproc *rproc);
> +int rproc_set_firmware_name(struct rproc *rproc, const char *firmware);
>  void rproc_shutdown(struct rproc *rproc);
>  void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
>  int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size);
> -- 
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

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Re: [PATCH v2 2/2] remoteproc: core: Prevent sleep when rproc crashes

[Mathieu Poirier]

On Wed, Apr 08, 2020 at 03:18:25PM -0700, Siddharth Gupta wrote:
> Remoteproc recovery should be fast and any delay will have an impact on the
> user-experience. Add a wakeup source to remoteproc which ensures that the
> system does not go into idle state while a remoteproc is recovering, thus
> prevent any delays that might occur during system resume.
> 
> Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
> ---
>  drivers/remoteproc/qcom_q6v5_pas.c   | 1 +
>  drivers/remoteproc/remoteproc_core.c | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index 7a63efb..6bb2c7d 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -401,6 +401,7 @@ static int adsp_probe(struct platform_device *pdev)
>  
>  	adsp = (struct qcom_adsp *)rproc->priv;
>  	adsp->dev = &pdev->dev;
> +	device_wakeup_enable(adsp->dev);
>  	adsp->rproc = rproc;
>  	adsp->pas_id = desc->pas_id;
>  	adsp->has_aggre2_clk = desc->has_aggre2_clk;
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 9f99fe2..19a360d 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1729,6 +1729,8 @@ static void rproc_crash_handler_work(struct work_struct *work)
>  
>  	if (!rproc->recovery_disabled)
>  		rproc_trigger_recovery(rproc);
> +
> +	pm_relax(rproc->dev.parent);
>  }
>  
>  /**
> @@ -2273,6 +2275,8 @@ void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type)
>  		return;
>  	}
>  
> +	pm_stay_awake(rproc->dev.parent);
> +

Much better:

Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>

>  	dev_err(&rproc->dev, "crash detected in %s: type %s\n",
>  		rproc->name, rproc_crash_to_string(type));
>  
> -- 
> Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project

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