[Xen-devel] [PATCH v3 2/5] ARM: ITS: Populate host_its_list from ACPI MADT Table

[mjaggi@xxxxxxxxxxxxxxxxxx]

From: Manish Jaggi <mjaggi@xxxxxxxxxx>

Added gicv3_its_acpi_init to update host_its_list from MADT table.
For ACPI, host_its structure  stores dt_node as NULL.

Signed-off-by: Manish Jaggi <mjaggi@xxxxxxxxxx>
---
 xen/arch/arm/gic-v3-its.c        | 26 ++++++++++++++++++++++++++
 xen/arch/arm/gic-v3.c            |  2 ++
 xen/include/asm-arm/gic_v3_its.h |  9 +++++++++
 3 files changed, 37 insertions(+)

diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c
index 61a6452..536b48d 100644
--- a/xen/arch/arm/gic-v3-its.c
+++ b/xen/arch/arm/gic-v3-its.c
@@ -25,6 +25,7 @@
 #include <xen/rbtree.h>
 #include <xen/sched.h>
 #include <xen/sizes.h>
+#include <xen/acpi.h>
 #include <asm/gic.h>
 #include <asm/gic_v3_defs.h>
 #include <asm/gic_v3_its.h>
@@ -32,6 +33,7 @@
 #include <asm/page.h>
 
 #define ITS_CMD_QUEUE_SZ                SZ_1M
+#define ACPI_GICV3_ITS_MEM_SIZE         SZ_64K
 
 /*
  * No lock here, as this list gets only populated upon boot while scanning
@@ -1018,6 +1020,30 @@ void gicv3_its_dt_init(const struct dt_device_node *node)
     }
 }
 
+#ifdef CONFIG_ACPI
+int gicv3_its_acpi_probe(struct acpi_subtable_header *header,
+                        const unsigned long end)
+{
+    struct acpi_madt_generic_translator *its;
+
+    its = (struct acpi_madt_generic_translator *)header;
+    if ( BAD_MADT_ENTRY(its, end) )
+        return -EINVAL;
+
+    add_to_host_its_list(its->base_address,
+                        ACPI_GICV3_ITS_MEM_SIZE, NULL);
+
+    return 0;
+}
+
+void gicv3_its_acpi_init(void)
+{
+    /* Parse ITS information */
+    acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
+                                  gicv3_its_acpi_probe, 0);
+}
+#endif
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index f990eae..6f562f4 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1567,6 +1567,8 @@ static void __init gicv3_acpi_init(void)
 
     gicv3.rdist_stride = 0;
 
+    gicv3_its_acpi_init();
+
     /*
      * In ACPI, 0 is considered as the invalid address. However the rest
      * of the initialization rely on the invalid address to be
diff --git a/xen/include/asm-arm/gic_v3_its.h b/xen/include/asm-arm/gic_v3_its.h
index 1fac1c7..993819a 100644
--- a/xen/include/asm-arm/gic_v3_its.h
+++ b/xen/include/asm-arm/gic_v3_its.h
@@ -135,6 +135,9 @@ extern struct list_head host_its_list;
 /* Parse the host DT and pick up all host ITSes. */
 void gicv3_its_dt_init(const struct dt_device_node *node);
 
+#ifdef CONFIG_ACPI
+void gicv3_its_acpi_init(void);
+#endif
 bool gicv3_its_host_has_its(void);
 
 unsigned int vgic_v3_its_count(const struct domain *d);
@@ -196,6 +199,12 @@ static inline void gicv3_its_dt_init(const struct 
dt_device_node *node)
 {
 }
 
+#ifdef CONFIG_ACPI
+static inline void gicv3_its_acpi_init(void)
+{
+}
+#endif
+
 static inline bool gicv3_its_host_has_its(void)
 {
     return false;
-- 
2.7.4


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