On 04/25/2018 06:14 PM, Bjorn Andersson wrote: > On Wed 25 Apr 08:18 PDT 2018, Alex Elder wrote: > >> Create function qcom_smem_virt_to_phys(), which returns the physical >> address corresponding to a given SMEM item's virtual address. This >> feature is required for a driver that will soon be out for review. >> > > It might be wise to turn the aux_base in smem_region into a phys_addr_t > and then mask that with AUX_BASE_MASK before comparing with the entry's > aux_base in qcom_smem_get_global(). But this will work fine until the > day someone places smem above 4GB. I thought of that but went for this for now, because it made for a nice, concise change. I agree with you though. Thanks a lot for the quick review. -Alex > Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > > Regards, > Bjorn > >> Signed-off-by: Alex Elder <elder@xxxxxxxxxx> >> --- >> drivers/soc/qcom/smem.c | 27 +++++++++++++++++++++++++++ >> include/linux/soc/qcom/smem.h | 2 ++ >> 2 files changed, 29 insertions(+) >> >> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c >> index 7d9a43da5084..70b2ee80d6bd 100644 >> --- a/drivers/soc/qcom/smem.c >> +++ b/drivers/soc/qcom/smem.c >> @@ -655,6 +655,33 @@ int qcom_smem_get_free_space(unsigned host) >> } >> EXPORT_SYMBOL(qcom_smem_get_free_space); >> >> +/** >> + * qcom_smem_virt_to_phys() - return the physical address associated >> + * with an smem item pointer (previously returned by qcom_smem_get() >> + * @p: the virtual address to convert >> + * >> + * Returns 0 if the pointer provided is not within any smem region. >> + */ >> +phys_addr_t qcom_smem_virt_to_phys(void *p) >> +{ >> + unsigned i; >> + >> + for (i = 0; i < __smem->num_regions; i++) { >> + struct smem_region *region = &__smem->regions[i]; >> + >> + if (p < region->virt_base) >> + continue; >> + if (p < region->virt_base + region->size) { >> + u64 offset = p - region->virt_base; >> + >> + return (phys_addr_t)region->aux_base + offset; >> + } >> + } >> + >> + return 0; >> +} >> +EXPORT_SYMBOL(qcom_smem_virt_to_phys); >> + >> 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 c1657ed27b30..86e1b358688a 100644 >> --- a/include/linux/soc/qcom/smem.h >> +++ b/include/linux/soc/qcom/smem.h >> @@ -9,4 +9,6 @@ void *qcom_smem_get(unsigned host, unsigned item, size_t *size); >> >> int qcom_smem_get_free_space(unsigned host); >> >> +phys_addr_t qcom_smem_virt_to_phys(void *p); >> + >> #endif >> -- >> 2.14.1 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html