irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain initialization

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>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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 (file)
--- 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;
 }