| Message ID | 1471274620-20754-4-git-send-email-lorenzo.pieralisi@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On 2016/8/15 23:23, Lorenzo Pieralisi wrote: > Since commit e647b532275b ("ACPI: Add early device probing > infrastructure") the kernel has gained the infrastructure that allows > adding linker script section entries to execute ACPI driver callbacks > (ie probe routines) for all subsystems that register a table entry > in the respective kernel section (eg clocksource, irqchip). > > Since ARM IOMMU devices data is described through IORT tables when > booting with ACPI, the ARM IOMMU drivers must be made able to hook ACPI > callback routines that are called to probe IORT entries and initialize > the respective IOMMU devices. > > To avoid adding driver specific hooks into IORT table initialization > code (breaking therefore code modularity - ie ACPI IORT code must be made > aware of ARM SMMU drivers ACPI init callbacks), this patch adds code > that allows ARM SMMU drivers to take advantage of the ACPI early probing > infrastructure, so that they can add linker script section entries > containing drivers callback to be executed on IORT tables detection. > > Since IORT nodes are differentiated by a type, the callback routines > can easily parse the IORT table entries, check the IORT nodes and > carry out some actions whenever the IORT node type associated with > the driver specific callback is matched. > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Cc: Tomasz Nowicki <tn@semihalf.com> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> > Cc: Marc Zyngier <marc.zyngier@arm.com> > --- > drivers/acpi/arm64/iort.c | 2 ++ > include/asm-generic/vmlinux.lds.h | 1 + > include/linux/iort.h | 3 +++ > 3 files changed, 6 insertions(+) > > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index 2543f60..cad7d1d 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -383,4 +383,6 @@ void __init iort_table_detect(void) > const char *msg = acpi_format_exception(status); > pr_err("Failed to get table, %s\n", msg); > } > + > + acpi_probe_device_table(iort); > } > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h > index 2456397..7ee4e0c 100644 > --- a/include/asm-generic/vmlinux.lds.h > +++ b/include/asm-generic/vmlinux.lds.h > @@ -546,6 +546,7 @@ > IRQCHIP_OF_MATCH_TABLE() \ > ACPI_PROBE_TABLE(irqchip) \ > ACPI_PROBE_TABLE(clksrc) \ > + ACPI_PROBE_TABLE(iort) \ > EARLYCON_TABLE() > > #define INIT_TEXT \ > diff --git a/include/linux/iort.h b/include/linux/iort.h > index d7daba1..9bb30c5 100644 > --- a/include/linux/iort.h > +++ b/include/linux/iort.h > @@ -38,4 +38,7 @@ static inline struct irq_domain * > iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; } > #endif > > +#define IORT_ACPI_DECLARE(name, table_id, fn) \ > + ACPI_DECLARE_PROBE_ENTRY(iort, name, table_id, 0, NULL, 0, fn) > + > #endif /* __IORT_H__ */ Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Thanks Hanjun -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 2543f60..cad7d1d 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -383,4 +383,6 @@ void __init iort_table_detect(void) const char *msg = acpi_format_exception(status); pr_err("Failed to get table, %s\n", msg); } + + acpi_probe_device_table(iort); } diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 2456397..7ee4e0c 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -546,6 +546,7 @@ IRQCHIP_OF_MATCH_TABLE() \ ACPI_PROBE_TABLE(irqchip) \ ACPI_PROBE_TABLE(clksrc) \ + ACPI_PROBE_TABLE(iort) \ EARLYCON_TABLE() #define INIT_TEXT \ diff --git a/include/linux/iort.h b/include/linux/iort.h index d7daba1..9bb30c5 100644 --- a/include/linux/iort.h +++ b/include/linux/iort.h @@ -38,4 +38,7 @@ static inline struct irq_domain * iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; } #endif +#define IORT_ACPI_DECLARE(name, table_id, fn) \ + ACPI_DECLARE_PROBE_ENTRY(iort, name, table_id, 0, NULL, 0, fn) + #endif /* __IORT_H__ */
Since commit e647b532275b ("ACPI: Add early device probing infrastructure") the kernel has gained the infrastructure that allows adding linker script section entries to execute ACPI driver callbacks (ie probe routines) for all subsystems that register a table entry in the respective kernel section (eg clocksource, irqchip). Since ARM IOMMU devices data is described through IORT tables when booting with ACPI, the ARM IOMMU drivers must be made able to hook ACPI callback routines that are called to probe IORT entries and initialize the respective IOMMU devices. To avoid adding driver specific hooks into IORT table initialization code (breaking therefore code modularity - ie ACPI IORT code must be made aware of ARM SMMU drivers ACPI init callbacks), this patch adds code that allows ARM SMMU drivers to take advantage of the ACPI early probing infrastructure, so that they can add linker script section entries containing drivers callback to be executed on IORT tables detection. Since IORT nodes are differentiated by a type, the callback routines can easily parse the IORT table entries, check the IORT nodes and carry out some actions whenever the IORT node type associated with the driver specific callback is matched. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Marc Zyngier <marc.zyngier@arm.com> --- drivers/acpi/arm64/iort.c | 2 ++ include/asm-generic/vmlinux.lds.h | 1 + include/linux/iort.h | 3 +++ 3 files changed, 6 insertions(+)