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[v5,0/5] remoteproc: qcom: PIL info support

Message ID 20200513055641.1413100-1-bjorn.andersson@linaro.org
Headers show
Series remoteproc: qcom: PIL info support | expand

Message

Bjorn Andersson May 13, 2020, 5:56 a.m. UTC 
Introduce support for filling out the relocation information in IMEM, to aid
post mortem debug tools to locate the various remoteprocs.

Bjorn Andersson (5):
  dt-bindings: remoteproc: Add Qualcomm PIL info binding
  remoteproc: qcom: Introduce helper to store pil info in IMEM
  remoteproc: qcom: Update PIL relocation info on load
  arm64: dts: qcom: qcs404: Add IMEM and PIL info region
  arm64: dts: qcom: sdm845: Add IMEM and PIL info region

 .../bindings/remoteproc/qcom,pil-info.yaml    |  44 +++++++
 arch/arm64/boot/dts/qcom/qcs404.dtsi          |  15 +++
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |  15 +++
 drivers/remoteproc/Kconfig                    |   6 +
 drivers/remoteproc/Makefile                   |   1 +
 drivers/remoteproc/qcom_pil_info.c            | 124 ++++++++++++++++++
 drivers/remoteproc/qcom_pil_info.h            |   7 +
 drivers/remoteproc/qcom_q6v5_adsp.c           |  16 ++-
 drivers/remoteproc/qcom_q6v5_mss.c            |   3 +
 drivers/remoteproc/qcom_q6v5_pas.c            |  15 ++-
 drivers/remoteproc/qcom_q6v5_wcss.c           |  14 +-
 drivers/remoteproc/qcom_wcnss.c               |  14 +-
 12 files changed, 262 insertions(+), 12 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,pil-info.yaml
 create mode 100644 drivers/remoteproc/qcom_pil_info.c
 create mode 100644 drivers/remoteproc/qcom_pil_info.h

Comments

Vinod Koul May 14, 2020, 4:53 p.m. UTC | #1 
On 12-05-20, 22:56, Bjorn Andersson wrote:
> Introduce support for filling out the relocation information in IMEM, to aid
> post mortem debug tools to locate the various remoteprocs.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Rishabh Bhatnagar May 19, 2020, 6:14 p.m. UTC | #2 
On 2020-05-12 22:56, Bjorn Andersson wrote:
> Update the PIL relocation information in IMEM with information about
> where the firmware for various remoteprocs are loaded.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v4:
> - Dropped unnecessary comment about ignoring return value.
> 
>  drivers/remoteproc/Kconfig          |  3 +++
>  drivers/remoteproc/qcom_q6v5_adsp.c | 16 +++++++++++++---
>  drivers/remoteproc/qcom_q6v5_mss.c  |  3 +++
>  drivers/remoteproc/qcom_q6v5_pas.c  | 15 ++++++++++++---
>  drivers/remoteproc/qcom_q6v5_wcss.c | 14 +++++++++++---
>  drivers/remoteproc/qcom_wcnss.c     | 14 +++++++++++---
>  6 files changed, 53 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 8088ca4dd6dc..6bd42a411ca8 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -126,6 +126,7 @@ config QCOM_Q6V5_ADSP
>  	depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
>  	depends on QCOM_SYSMON || QCOM_SYSMON=n
>  	select MFD_SYSCON
> +	select QCOM_PIL_INFO
>  	select QCOM_MDT_LOADER
>  	select QCOM_Q6V5_COMMON
>  	select QCOM_RPROC_COMMON
> @@ -158,6 +159,7 @@ config QCOM_Q6V5_PAS
>  	depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
>  	depends on QCOM_SYSMON || QCOM_SYSMON=n
>  	select MFD_SYSCON
> +	select QCOM_PIL_INFO
>  	select QCOM_MDT_LOADER
>  	select QCOM_Q6V5_COMMON
>  	select QCOM_RPROC_COMMON
> @@ -209,6 +211,7 @@ config QCOM_WCNSS_PIL
>  	depends on QCOM_SMEM
>  	depends on QCOM_SYSMON || QCOM_SYSMON=n
>  	select QCOM_MDT_LOADER
> +	select QCOM_PIL_INFO
>  	select QCOM_RPROC_COMMON
>  	select QCOM_SCM
>  	help
> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c
> b/drivers/remoteproc/qcom_q6v5_adsp.c
> index d2a2574dcf35..c539e89664cb 100644
> --- a/drivers/remoteproc/qcom_q6v5_adsp.c
> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c
> @@ -26,6 +26,7 @@
>  #include <linux/soc/qcom/smem_state.h>
> 
>  #include "qcom_common.h"
> +#include "qcom_pil_info.h"
>  #include "qcom_q6v5.h"
>  #include "remoteproc_internal.h"
> 
> @@ -82,6 +83,7 @@ struct qcom_adsp {
>  	unsigned int halt_lpass;
> 
>  	int crash_reason_smem;
> +	const char *info_name;
> 
>  	struct completion start_done;
>  	struct completion stop_done;
> @@ -164,10 +166,17 @@ static int qcom_adsp_shutdown(struct qcom_adsp 
> *adsp)
>  static int adsp_load(struct rproc *rproc, const struct firmware *fw)
>  {
>  	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> +	int ret;
> +
> +	ret = qcom_mdt_load_no_init(adsp->dev, fw, rproc->firmware, 0,
> +				    adsp->mem_region, adsp->mem_phys,
> +				    adsp->mem_size, &adsp->mem_reloc);
> +	if (ret)
> +		return ret;
> +
> +	qcom_pil_info_store(adsp->info_name, adsp->mem_reloc, 
> adsp->mem_size);
> 
> -	return qcom_mdt_load_no_init(adsp->dev, fw, rproc->firmware, 0,
> -			     adsp->mem_region, adsp->mem_phys, adsp->mem_size,
> -			     &adsp->mem_reloc);
> +	return 0;
>  }
> 
>  static int adsp_start(struct rproc *rproc)
> @@ -436,6 +445,7 @@ static int adsp_probe(struct platform_device *pdev)
>  	adsp = (struct qcom_adsp *)rproc->priv;
>  	adsp->dev = &pdev->dev;
>  	adsp->rproc = rproc;
> +	adsp->info_name = desc->sysmon_name;
>  	platform_set_drvdata(pdev, adsp);
> 
>  	ret = adsp_alloc_memory_region(adsp);
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c
> b/drivers/remoteproc/qcom_q6v5_mss.c
> index c4936f4d1e80..fdbcae11ae64 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -29,6 +29,7 @@
> 
>  #include "remoteproc_internal.h"
>  #include "qcom_common.h"
> +#include "qcom_pil_info.h"
>  #include "qcom_q6v5.h"
> 
>  #include <linux/qcom_scm.h>
> @@ -1221,6 +1222,8 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
>  	else if (ret < 0)
>  		dev_err(qproc->dev, "MPSS authentication failed: %d\n", ret);
> 
> +	qcom_pil_info_store("modem", mpss_reloc, qproc->mpss_size);
> +
>  release_firmware:
>  	release_firmware(fw);
>  out:
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c
> b/drivers/remoteproc/qcom_q6v5_pas.c
> index 3bb69f58e086..84cb19231c35 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -25,6 +25,7 @@
>  #include <linux/soc/qcom/smem_state.h>
> 
>  #include "qcom_common.h"
> +#include "qcom_pil_info.h"
>  #include "qcom_q6v5.h"
>  #include "remoteproc_internal.h"
> 
> @@ -64,6 +65,7 @@ struct qcom_adsp {
>  	int pas_id;
>  	int crash_reason_smem;
>  	bool has_aggre2_clk;
> +	const char *info_name;
> 
>  	struct completion start_done;
>  	struct completion stop_done;
> @@ -117,11 +119,17 @@ static void adsp_pds_disable(struct qcom_adsp
> *adsp, struct device **pds,
>  static int adsp_load(struct rproc *rproc, const struct firmware *fw)
>  {
>  	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> +	int ret;
> 
> -	return qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
> -			     adsp->mem_region, adsp->mem_phys, adsp->mem_size,
> -			     &adsp->mem_reloc);
> +	ret = qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
> +			    adsp->mem_region, adsp->mem_phys, adsp->mem_size,
> +			    &adsp->mem_reloc);
> +	if (ret)
> +		return ret;
> 
> +	qcom_pil_info_store(adsp->info_name, adsp->mem_reloc, 
> adsp->mem_size);
mem_reloc is used to calculate  offset and then we again add that offset 
to the
ioremapped region base. So we should pass adsp->mem_phys as start here?
> +
> +	return 0;
>  }
> 
>  static int adsp_start(struct rproc *rproc)
> @@ -405,6 +413,7 @@ static int adsp_probe(struct platform_device *pdev)
>  	adsp->rproc = rproc;
>  	adsp->pas_id = desc->pas_id;
>  	adsp->has_aggre2_clk = desc->has_aggre2_clk;
> +	adsp->info_name = desc->sysmon_name;
>  	platform_set_drvdata(pdev, adsp);
> 
>  	ret = adsp_alloc_memory_region(adsp);
> diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c
> b/drivers/remoteproc/qcom_q6v5_wcss.c
> index f1924b740a10..962e37a86b8b 100644
> --- a/drivers/remoteproc/qcom_q6v5_wcss.c
> +++ b/drivers/remoteproc/qcom_q6v5_wcss.c
> @@ -421,10 +421,18 @@ static void *q6v5_wcss_da_to_va(struct rproc
> *rproc, u64 da, size_t len)
>  static int q6v5_wcss_load(struct rproc *rproc, const struct firmware 
> *fw)
>  {
>  	struct q6v5_wcss *wcss = rproc->priv;
> +	int ret;
> +
> +	ret = qcom_mdt_load_no_init(wcss->dev, fw, rproc->firmware,
> +				    0, wcss->mem_region, wcss->mem_phys,
> +				    wcss->mem_size, &wcss->mem_reloc);
> +	if (ret)
> +		return ret;
> +
> +	/* Failures only affect post mortem debugging, so ignore return value 
> */
> +	qcom_pil_info_store("wcnss", wcss->mem_reloc, wcss->mem_size);
> 
> -	return qcom_mdt_load_no_init(wcss->dev, fw, rproc->firmware,
> -				     0, wcss->mem_region, wcss->mem_phys,
> -				     wcss->mem_size, &wcss->mem_reloc);
> +	return ret;
>  }
> 
>  static const struct rproc_ops q6v5_wcss_ops = {
> diff --git a/drivers/remoteproc/qcom_wcnss.c 
> b/drivers/remoteproc/qcom_wcnss.c
> index 5d65e1a9329a..229482b3231f 100644
> --- a/drivers/remoteproc/qcom_wcnss.c
> +++ b/drivers/remoteproc/qcom_wcnss.c
> @@ -27,6 +27,7 @@
> 
>  #include "qcom_common.h"
>  #include "remoteproc_internal.h"
> +#include "qcom_pil_info.h"
>  #include "qcom_wcnss.h"
> 
>  #define WCNSS_CRASH_REASON_SMEM		422
> @@ -145,10 +146,17 @@ void qcom_wcnss_assign_iris(struct qcom_wcnss 
> *wcnss,
>  static int wcnss_load(struct rproc *rproc, const struct firmware *fw)
>  {
>  	struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
> +	int ret;
> +
> +	ret = qcom_mdt_load(wcnss->dev, fw, rproc->firmware, WCNSS_PAS_ID,
> +			    wcnss->mem_region, wcnss->mem_phys,
> +			    wcnss->mem_size, &wcnss->mem_reloc);
> +	if (ret)
> +		return ret;
> +
> +	qcom_pil_info_store("wcnss", wcnss->mem_reloc, wcnss->mem_size);
> 
> -	return qcom_mdt_load(wcnss->dev, fw, rproc->firmware, WCNSS_PAS_ID,
> -			     wcnss->mem_region, wcnss->mem_phys,
> -			     wcnss->mem_size, &wcnss->mem_reloc);
> +	return 0;
>  }
> 
>  static void wcnss_indicate_nv_download(struct qcom_wcnss *wcnss)
Bjorn Andersson May 19, 2020, 11:07 p.m. UTC | #3 
On Tue 19 May 11:14 PDT 2020, rishabhb@codeaurora.org wrote:

> On 2020-05-12 22:56, Bjorn Andersson wrote:
> > Update the PIL relocation information in IMEM with information about
> > where the firmware for various remoteprocs are loaded.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > ---
> > 
> > Changes since v4:
> > - Dropped unnecessary comment about ignoring return value.
> > 
> >  drivers/remoteproc/Kconfig          |  3 +++
> >  drivers/remoteproc/qcom_q6v5_adsp.c | 16 +++++++++++++---
> >  drivers/remoteproc/qcom_q6v5_mss.c  |  3 +++
> >  drivers/remoteproc/qcom_q6v5_pas.c  | 15 ++++++++++++---
> >  drivers/remoteproc/qcom_q6v5_wcss.c | 14 +++++++++++---
> >  drivers/remoteproc/qcom_wcnss.c     | 14 +++++++++++---
> >  6 files changed, 53 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> > index 8088ca4dd6dc..6bd42a411ca8 100644
> > --- a/drivers/remoteproc/Kconfig
> > +++ b/drivers/remoteproc/Kconfig
> > @@ -126,6 +126,7 @@ config QCOM_Q6V5_ADSP
> >  	depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
> >  	depends on QCOM_SYSMON || QCOM_SYSMON=n
> >  	select MFD_SYSCON
> > +	select QCOM_PIL_INFO
> >  	select QCOM_MDT_LOADER
> >  	select QCOM_Q6V5_COMMON
> >  	select QCOM_RPROC_COMMON
> > @@ -158,6 +159,7 @@ config QCOM_Q6V5_PAS
> >  	depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
> >  	depends on QCOM_SYSMON || QCOM_SYSMON=n
> >  	select MFD_SYSCON
> > +	select QCOM_PIL_INFO
> >  	select QCOM_MDT_LOADER
> >  	select QCOM_Q6V5_COMMON
> >  	select QCOM_RPROC_COMMON
> > @@ -209,6 +211,7 @@ config QCOM_WCNSS_PIL
> >  	depends on QCOM_SMEM
> >  	depends on QCOM_SYSMON || QCOM_SYSMON=n
> >  	select QCOM_MDT_LOADER
> > +	select QCOM_PIL_INFO
> >  	select QCOM_RPROC_COMMON
> >  	select QCOM_SCM
> >  	help
> > diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c
> > b/drivers/remoteproc/qcom_q6v5_adsp.c
> > index d2a2574dcf35..c539e89664cb 100644
> > --- a/drivers/remoteproc/qcom_q6v5_adsp.c
> > +++ b/drivers/remoteproc/qcom_q6v5_adsp.c
> > @@ -26,6 +26,7 @@
> >  #include <linux/soc/qcom/smem_state.h>
> > 
> >  #include "qcom_common.h"
> > +#include "qcom_pil_info.h"
> >  #include "qcom_q6v5.h"
> >  #include "remoteproc_internal.h"
> > 
> > @@ -82,6 +83,7 @@ struct qcom_adsp {
> >  	unsigned int halt_lpass;
> > 
> >  	int crash_reason_smem;
> > +	const char *info_name;
> > 
> >  	struct completion start_done;
> >  	struct completion stop_done;
> > @@ -164,10 +166,17 @@ static int qcom_adsp_shutdown(struct qcom_adsp
> > *adsp)
> >  static int adsp_load(struct rproc *rproc, const struct firmware *fw)
> >  {
> >  	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> > +	int ret;
> > +
> > +	ret = qcom_mdt_load_no_init(adsp->dev, fw, rproc->firmware, 0,
> > +				    adsp->mem_region, adsp->mem_phys,
> > +				    adsp->mem_size, &adsp->mem_reloc);
> > +	if (ret)
> > +		return ret;
> > +
> > +	qcom_pil_info_store(adsp->info_name, adsp->mem_reloc, adsp->mem_size);
> > 
> > -	return qcom_mdt_load_no_init(adsp->dev, fw, rproc->firmware, 0,
> > -			     adsp->mem_region, adsp->mem_phys, adsp->mem_size,
> > -			     &adsp->mem_reloc);
> > +	return 0;
> >  }
> > 
> >  static int adsp_start(struct rproc *rproc)
> > @@ -436,6 +445,7 @@ static int adsp_probe(struct platform_device *pdev)
> >  	adsp = (struct qcom_adsp *)rproc->priv;
> >  	adsp->dev = &pdev->dev;
> >  	adsp->rproc = rproc;
> > +	adsp->info_name = desc->sysmon_name;
> >  	platform_set_drvdata(pdev, adsp);
> > 
> >  	ret = adsp_alloc_memory_region(adsp);
> > diff --git a/drivers/remoteproc/qcom_q6v5_mss.c
> > b/drivers/remoteproc/qcom_q6v5_mss.c
> > index c4936f4d1e80..fdbcae11ae64 100644
> > --- a/drivers/remoteproc/qcom_q6v5_mss.c
> > +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> > @@ -29,6 +29,7 @@
> > 
> >  #include "remoteproc_internal.h"
> >  #include "qcom_common.h"
> > +#include "qcom_pil_info.h"
> >  #include "qcom_q6v5.h"
> > 
> >  #include <linux/qcom_scm.h>
> > @@ -1221,6 +1222,8 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> >  	else if (ret < 0)
> >  		dev_err(qproc->dev, "MPSS authentication failed: %d\n", ret);
> > 
> > +	qcom_pil_info_store("modem", mpss_reloc, qproc->mpss_size);
> > +
> >  release_firmware:
> >  	release_firmware(fw);
> >  out:
> > diff --git a/drivers/remoteproc/qcom_q6v5_pas.c
> > b/drivers/remoteproc/qcom_q6v5_pas.c
> > index 3bb69f58e086..84cb19231c35 100644
> > --- a/drivers/remoteproc/qcom_q6v5_pas.c
> > +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> > @@ -25,6 +25,7 @@
> >  #include <linux/soc/qcom/smem_state.h>
> > 
> >  #include "qcom_common.h"
> > +#include "qcom_pil_info.h"
> >  #include "qcom_q6v5.h"
> >  #include "remoteproc_internal.h"
> > 
> > @@ -64,6 +65,7 @@ struct qcom_adsp {
> >  	int pas_id;
> >  	int crash_reason_smem;
> >  	bool has_aggre2_clk;
> > +	const char *info_name;
> > 
> >  	struct completion start_done;
> >  	struct completion stop_done;
> > @@ -117,11 +119,17 @@ static void adsp_pds_disable(struct qcom_adsp
> > *adsp, struct device **pds,
> >  static int adsp_load(struct rproc *rproc, const struct firmware *fw)
> >  {
> >  	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> > +	int ret;
> > 
> > -	return qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
> > -			     adsp->mem_region, adsp->mem_phys, adsp->mem_size,
> > -			     &adsp->mem_reloc);
> > +	ret = qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
> > +			    adsp->mem_region, adsp->mem_phys, adsp->mem_size,
> > +			    &adsp->mem_reloc);
> > +	if (ret)
> > +		return ret;
> > 
> > +	qcom_pil_info_store(adsp->info_name, adsp->mem_reloc, adsp->mem_size);
> mem_reloc is used to calculate  offset and then we again add that offset to
> the
> ioremapped region base. So we should pass adsp->mem_phys as start here?

You're correct, I will respin this.

Thanks,
Bjorn
Mathieu Poirier May 20, 2020, 6 p.m. UTC | #4 
On Tue, May 12, 2020 at 10:56:38PM -0700, Bjorn Andersson wrote:
> A region in IMEM is used to communicate load addresses of remoteproc to
> post mortem debug tools. Implement a helper function that can be used to
> store this information in order to enable these tools to process
> collected ramdumps.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v4:
> - Replaced platform_driver by just a single helper function
> - Lazy initialization of mapping
> - Cleaned up search loop
> - Replaced regmap access of IMEM with ioremap and normal accessors
> 
>  drivers/remoteproc/Kconfig         |   3 +
>  drivers/remoteproc/Makefile        |   1 +
>  drivers/remoteproc/qcom_pil_info.c | 124 +++++++++++++++++++++++++++++
>  drivers/remoteproc/qcom_pil_info.h |   7 ++
>  4 files changed, 135 insertions(+)
>  create mode 100644 drivers/remoteproc/qcom_pil_info.c
>  create mode 100644 drivers/remoteproc/qcom_pil_info.h
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index fbaed079b299..8088ca4dd6dc 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -107,6 +107,9 @@ config KEYSTONE_REMOTEPROC
>  	  It's safe to say N here if you're not interested in the Keystone
>  	  DSPs or just want to use a bare minimum kernel.
>  
> +config QCOM_PIL_INFO
> +	tristate
> +
>  config QCOM_RPROC_COMMON
>  	tristate
>  
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 0effd3825035..cc0f631adb3b 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_OMAP_REMOTEPROC)		+= omap_remoteproc.o
>  obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
>  obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
>  obj-$(CONFIG_KEYSTONE_REMOTEPROC)	+= keystone_remoteproc.o
> +obj-$(CONFIG_QCOM_PIL_INFO)		+= qcom_pil_info.o
>  obj-$(CONFIG_QCOM_RPROC_COMMON)		+= qcom_common.o
>  obj-$(CONFIG_QCOM_Q6V5_COMMON)		+= qcom_q6v5.o
>  obj-$(CONFIG_QCOM_Q6V5_ADSP)		+= qcom_q6v5_adsp.o
> diff --git a/drivers/remoteproc/qcom_pil_info.c b/drivers/remoteproc/qcom_pil_info.c
> new file mode 100644
> index 000000000000..0785c7cde2d3
> --- /dev/null
> +++ b/drivers/remoteproc/qcom_pil_info.c
> @@ -0,0 +1,124 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2019-2020 Linaro Ltd.
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_address.h>
> +
> +#define PIL_RELOC_NAME_LEN	8
> +
> +struct pil_reloc_entry {
> +	char name[PIL_RELOC_NAME_LEN];
> +	__le64 base;
> +	__le32 size;
> +} __packed;
> +
> +struct pil_reloc {
> +	struct device *dev;
> +	void __iomem *base;
> +	size_t num_entries;
> +};
> +
> +static struct pil_reloc _reloc __read_mostly;
> +static DEFINE_MUTEX(reloc_mutex);
> +
> +static int qcom_pil_info_init(void)
> +{
> +	struct device_node *np;
> +	struct resource imem;
> +	void __iomem *base;
> +	int ret;
> +
> +	/* Already initialized? */
> +	if (_reloc.base)
> +		return 0;
> +
> +	np = of_find_compatible_node(NULL, NULL, "qcom,pil-reloc-info");
> +	if (!np)
> +		return -ENOENT;
> +
> +	ret = of_address_to_resource(np, 0, &imem);
> +	of_node_put(np);
> +	if (ret < 0)
> +		return ret;
> +
> +	base = ioremap(imem.start, resource_size(&imem));
> +	if (!base) {
> +		pr_err("failed to map PIL relocation info region\n");
> +		return -ENOMEM;
> +	}
> +
> +	memset_io(base, 0, resource_size(&imem));
> +
> +	_reloc.base = base;
> +	_reloc.num_entries = resource_size(&imem) / sizeof(struct pil_reloc_entry);
> +
> +	return 0;
> +}
> +
> +/**
> + * qcom_pil_info_store() - store PIL information of image in IMEM
> + * @image:	name of the image
> + * @base:	base address of the loaded image
> + * @size:	size of the loaded image
> + *
> + * Return: 0 on success, negative errno on failure
> + */
> +int qcom_pil_info_store(const char *image, phys_addr_t base, size_t size)
> +{
> +	char buf[PIL_RELOC_NAME_LEN];
> +	void __iomem *entry;
> +	int ret;
> +	int i;
> +
> +	mutex_lock(&reloc_mutex);
> +	ret = qcom_pil_info_init();
> +	if (ret < 0) {
> +		mutex_unlock(&reloc_mutex);
> +		return ret;
> +	}
> +
> +	for (i = 0; i < _reloc.num_entries; i++) {
> +		entry = _reloc.base + i * sizeof(struct pil_reloc_entry);
> +
> +		memcpy_fromio(buf, entry, PIL_RELOC_NAME_LEN);
> +
> +		/*
> +		 * An empty record means we didn't find it, given that the
> +		 * records are packed.
> +		 */
> +		if (!buf[0])
> +			goto found_unused;
> +
> +		if (!strncmp(buf, image, PIL_RELOC_NAME_LEN))
> +			goto found_existing;
> +	}
> +
> +	pr_warn("insufficient PIL info slots\n");
> +	mutex_unlock(&reloc_mutex);
> +	return -ENOMEM;
> +
> +found_unused:
> +	memcpy_toio(entry, image, PIL_RELOC_NAME_LEN);
> +found_existing:
> +	writel(base, entry + offsetof(struct pil_reloc_entry, base));
> +	writel(size, entry + offsetof(struct pil_reloc_entry, size));
> +	mutex_unlock(&reloc_mutex);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(qcom_pil_info_store);
> +
> +static void __exit pil_reloc_exit(void)
> +{
> +	mutex_lock(&reloc_mutex);
> +	iounmap(_reloc.base);
> +	_reloc.base = NULL;
> +	mutex_unlock(&reloc_mutex);
> +}
> +module_exit(pil_reloc_exit);
> +
> +MODULE_DESCRIPTION("Qualcomm PIL relocation info");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/remoteproc/qcom_pil_info.h b/drivers/remoteproc/qcom_pil_info.h
> new file mode 100644
> index 000000000000..1b89a63ba82f
> --- /dev/null
> +++ b/drivers/remoteproc/qcom_pil_info.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef __QCOM_PIL_INFO_H__
> +#define __QCOM_PIL_INFO_H__
> +
> +int qcom_pil_info_store(const char *image, phys_addr_t base, size_t size);
> +
> +#endif

Very clean an easy to understand.

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

> -- 
> 2.26.2
>
Rob Herring (Arm) May 26, 2020, 10:32 p.m. UTC | #5 
On Tue, 12 May 2020 22:56:37 -0700, Bjorn Andersson wrote:
> Add a devicetree binding for the Qualcomm peripheral image loader
> relocation information region found in the IMEM.
> 
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v4:
> - Fixed reg in example to make it compile
> 
>  .../bindings/remoteproc/qcom,pil-info.yaml    | 44 +++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/qcom,pil-info.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>