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[PATCH V10 8/8] irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain initialization

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Let ACPI build ITS PCI MSI domain. ACPI code is responsible for retrieving
inner domain token and passing it on to its_pci_msi_init_one generic
init call.

IORT maintains list of registered domain tokens and allows to find
corresponding domain based on MADT ITS subtable ID info.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 drivers/irqchip/irq-gic-v3-its-pci-msi.c | 44 ++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index d2c2496..aee1c60 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -15,6 +15,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/acpi_iort.h>
 #include <linux/msi.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
@@ -144,9 +145,52 @@ static int __init its_pci_of_msi_init(void)
 	return 0;
 }
 
+#ifdef CONFIG_ACPI
+
+static int __init
+its_pci_msi_parse_madt(struct acpi_subtable_header *header,
+		       const unsigned long end)
+{
+	struct acpi_madt_generic_translator *its_entry;
+	struct fwnode_handle *dom_handle;
+	const char *node_name;
+	int err = -ENXIO;
+
+	its_entry = (struct acpi_madt_generic_translator *)header;
+	node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
+			      (long)its_entry->base_address);
+	dom_handle = iort_find_domain_token(its_entry->translation_id);
+	if (!dom_handle) {
+		pr_err("%s: Unable to locate ITS domain handle\n", node_name);
+		goto out;
+	}
+
+	err = its_pci_msi_init_one(dom_handle, node_name);
+	if (!err)
+		pr_info("PCI/MSI: %s domain created\n", node_name);
+
+out:
+	kfree(node_name);
+	return err;
+}
+
+static int __init its_pci_acpi_msi_init(void)
+{
+	acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
+			      its_pci_msi_parse_madt, 0);
+	return 0;
+}
+#else
+static int __init its_pci_acpi_msi_init(void)
+{
+	return 0;
+}
+#endif
+
 static int __init its_pci_msi_init(void)
 {
 	its_pci_of_msi_init();
+	its_pci_acpi_msi_init();
 
 	return 0;
 }
-- 
1.9.1

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[PATCH V10 0/8] Introduce ACPI world to ITS irqchip Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:10 +0200
  [PATCH V10 6/8] irqchip/gicv3-its: Probe ITS in the ACPI way Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:10 +0200
  [PATCH V10 1/8] ACPI: I/O Remapping Table (IORT) initial support Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:10 +0200
    [UPDATE PATCH V10 1/8] ACPI: I/O Remapping Table (IORT) initial support Tomasz Nowicki <tn@semihalf.com> - 2016-09-07 14:00 +0200
      Re: [UPDATE PATCH V10 1/8] ACPI: I/O Remapping Table (IORT) initial  support Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-09-08 16:00 +0200
      Re: [UPDATE PATCH V10 1/8] ACPI: I/O Remapping Table (IORT) initial  support Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-09-09 11:30 +0200
    Re: [PATCH V10 1/8] ACPI: I/O Remapping Table (IORT) initial support Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> - 2016-09-09 10:50 +0200
  [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI domain handling Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:10 +0200
    Re: [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI  domain handling Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 12:30 +0200
      Re: [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI  domain handling Tomasz Nowicki <tn@semihalf.com> - 2016-09-07 12:40 +0200
        Re: [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI  domain handling "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-07 13:40 +0200
    Re: [PATCH V10 2/8] ACPI: Add new IORT functions to support MSI  domain handling Thomas Gleixner <tglx@linutronix.de> - 2016-09-06 12:30 +0200
    [UPDATE PATCH V10 2/8] ACPI: Add new IORT functions to support MSI domain handling Tomasz Nowicki <tn@semihalf.com> - 2016-09-07 14:00 +0200
      Re: [UPDATE PATCH V10 2/8] ACPI: Add new IORT functions to support  MSI domain handling Tomasz Nowicki <tn@semihalf.com> - 2016-09-07 15:10 +0200
  [PATCH V10 7/8] irqchip/gicv3-its: Factor out PCI-MSI part that might be reused for ACPI Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:10 +0200
    Re: [PATCH V10 7/8] irqchip/gicv3-its: Factor out PCI-MSI part that  might be reused for ACPI Thomas Gleixner <tglx@linutronix.de> - 2016-09-06 12:00 +0200
      Re: [PATCH V10 7/8] irqchip/gicv3-its: Factor out PCI-MSI part that  might be reused for ACPI Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 12:30 +0200
        Re: [PATCH V10 7/8] irqchip/gicv3-its: Factor out PCI-MSI part that  might be reused for ACPI "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-06 13:30 +0200
          Re: [PATCH V10 7/8] irqchip/gicv3-its: Factor out PCI-MSI part that  might be reused for ACPI Tomasz Nowicki <tn@semihalf.com> - 2016-09-07 09:50 +0200
  [PATCH V10 4/8] irqchip/gicv3-its: Cleanup for ITS domain initialization Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:20 +0200
  [PATCH V10 8/8] irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain initialization Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:20 +0200
  [PATCH V10 3/8] PCI/MSI: Setup MSI domain on a per-device basis using IORT ACPI table Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:20 +0200
  [PATCH V10 5/8] irqchip/gicv3-its: Refactor ITS DT init code to prepare for ACPI Tomasz Nowicki <tn@semihalf.com> - 2016-09-06 11:20 +0200

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