Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1447176

[RFC PATCH v3 02/13] drivers: acpi: iort: introduce linker section for IORT entries probing

Show all headers | View raw

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/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/iort.c b/drivers/acpi/iort.c
index 6611607..1f440d2 100644
--- a/drivers/acpi/iort.c
+++ b/drivers/acpi/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 6a67ab9..b896ab2 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -538,6 +538,7 @@
 	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__ */
-- 
2.6.4

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[RFC PATCH v3 00/13] ACPI IORT ARM SMMU v3 support Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 06/13] drivers: acpi: implement acpi_dma_configure Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 04/13] drivers: platform: add fwnode base platform devices retrieval Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 07/13] drivers: acpi: iort: add node match function Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 10/13] drivers: iommu: arm-smmu-v3: enable ACPI driver initialization Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 02/13] drivers: acpi: iort: introduce linker section for IORT entries probing Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 01/13] drivers: iommu: add FWNODE_IOMMU fwnode type Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 13/13] drivers: acpi: iort: introduce iort_iommu_configure Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 09/13] drivers: iommu: arm-smmu-v3: split probe functions into DT/generic portions Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 11/13] drivers: iommu: arm-smmu-v3: add IORT platform device creation Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
  [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF agnostic Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-20 13:30 +0200
    Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF  agnostic Robin Murphy <robin.murphy@arm.com> - 2016-07-25 17:20 +0200
      Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF agnostic Rob Herring <robh@kernel.org> - 2016-07-25 17:30 +0200
        Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF  agnostic Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-25 18:00 +0200
      Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF  agnostic Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-25 17:50 +0200
        Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF  agnostic Robin Murphy <robin.murphy@arm.com> - 2016-07-25 18:00 +0200
          Re: [RFC PATCH v3 05/13] drivers: iommu: make iommu_fwspec OF  agnostic Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-25 18:20 +0200
  Re: [RFC PATCH v3 00/13] ACPI IORT ARM SMMU v3 support Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-07-25 10:40 +0200

csiph-web