Messages in this thread | | | Date | Thu, 25 May 2023 18:28:59 +0530 | Subject | Re: [PATCH v3 3/5] soc: qcom: smem: introduce qcom_smem_get_msm_id() | From | Kathiravan T <> |
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On 5/25/2023 5:39 PM, Robert Marko wrote: > Introduce a helper to return the SoC SMEM ID, which is used to identify the > exact SoC model as there may be differences in the same SoC family. > > Currently, cpufreq-nvmem does this completely in the driver and there has > been more interest expresed for other drivers to use this information so > lets expose a common helper to prevent redoing it in individual drivers > since this field is present on every SMEM table version. > > Signed-off-by: Robert Marko <robimarko@gmail.com> > --- > Changes in v3: > * Change export to EXPORT_SYMBOL_GPL > * Use an argument for returning SoC ID > * Update kerneldoc > --- > drivers/soc/qcom/smem.c | 24 ++++++++++++++++++++++++ > include/linux/soc/qcom/smem.h | 2 ++ > 2 files changed, 26 insertions(+) > > diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c > index bc98520c4969..185ed0da11a1 100644 > --- a/drivers/soc/qcom/smem.c > +++ b/drivers/soc/qcom/smem.c > @@ -14,6 +14,7 @@ > #include <linux/sizes.h> > #include <linux/slab.h> > #include <linux/soc/qcom/smem.h> > +#include <linux/soc/qcom/socinfo.h> > > /* > * The Qualcomm shared memory system is a allocate only heap structure that > @@ -772,6 +773,29 @@ phys_addr_t qcom_smem_virt_to_phys(void *p) > } > EXPORT_SYMBOL_GPL(qcom_smem_virt_to_phys); > > +/** > + * qcom_smem_get_msm_id() - return the SoC ID > + * @id: On success, we return the SoC ID here. > + * > + * Look up SoC ID from HW/SW build ID and return it. > + * > + * Return: 0 on success, negative errno on failure. > + */ > +int qcom_smem_get_msm_id(u32 *id)
I think, MSM is not the only platform which will leverage this API. qcom_smem_get_soc_id() / qcom_smem_get_cpu_id() would make more sense than qcom_smem_get_msm_id() ?
> +{ > + size_t len; > + struct socinfo *info; > + > + info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, &len);
len is unused after this, can we just pass NULL? Did a quick check on the code, if we pass the address, size of the item will be updated, else no.
> + if (IS_ERR(info)) > + return PTR_ERR(info); > + > + *id = info->id; > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(qcom_smem_get_msm_id); > + > static int qcom_smem_get_sbl_version(struct qcom_smem *smem) > { > struct smem_header *header; > diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h > index 86e1b358688a..cb204ad6373c 100644 > --- a/include/linux/soc/qcom/smem.h > +++ b/include/linux/soc/qcom/smem.h > @@ -11,4 +11,6 @@ int qcom_smem_get_free_space(unsigned host); > > phys_addr_t qcom_smem_virt_to_phys(void *p); > > +int qcom_smem_get_msm_id(u32 *id); > + > #endif
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