[kvm-unit-tests PATCH v8 08/13] arm/arm64: ITS: Device and collection Initialization

[Eric Auger]

Introduce an helper functions to register
- a new device, characterized by its device id and the
  max number of event IDs that dimension its ITT (Interrupt
  Translation Table).  The function allocates the ITT.

- a new collection, characterized by its ID and the
  target processing engine (PE).

Signed-off-by: Eric Auger <address@hidden>
Reviewed-by: Zenghui Yu <address@hidden>

---

v7 -> v8:
- col_id and col parameter become u16
- added Zenghui's R-b

v3 -> v4:
- remove unused its_baser variable from its_create_device()
- use get_order()
- device->itt becomes a GVA instead of GPA

v2 -> v3:
- s/report_abort/assert

v1 -> v2:
- s/nb_/nr_
---
 lib/arm64/asm/gic-v3-its.h | 19 +++++++++++++++++++
 lib/arm64/gic-v3-its.c     | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/lib/arm64/asm/gic-v3-its.h b/lib/arm64/asm/gic-v3-its.h
index 7e03e4c..628eedf 100644
--- a/lib/arm64/asm/gic-v3-its.h
+++ b/lib/arm64/asm/gic-v3-its.h
@@ -31,6 +31,19 @@ struct its_baser {
 };
 
 #define GITS_BASER_NR_REGS             8
+#define GITS_MAX_DEVICES               8
+#define GITS_MAX_COLLECTIONS           8
+
+struct its_device {
+       u32 device_id;  /* device ID */
+       u32 nr_ites;    /* Max Interrupt Translation Entries */
+       void *itt;      /* Interrupt Translation Table GVA */
+};
+
+struct its_collection {
+       u64 target_address;
+       u16 col_id;
+};
 
 struct its_data {
        void *base;
@@ -39,6 +52,10 @@ struct its_data {
        struct its_baser coll_baser;
        struct its_cmd_block *cmd_base;
        struct its_cmd_block *cmd_write;
+       struct its_device devices[GITS_MAX_DEVICES];
+       u32 nr_devices;         /* Allocated Devices */
+       struct its_collection collections[GITS_MAX_COLLECTIONS];
+       u16 nr_collections;     /* Allocated Collections */
 };
 
 extern struct its_data its_data;
@@ -93,5 +110,7 @@ extern void its_parse_typer(void);
 extern void its_init(void);
 extern int its_baser_lookup(int i, struct its_baser *baser);
 extern void its_enable_defaults(void);
+extern struct its_device *its_create_device(u32 dev_id, int nr_ites);
+extern struct its_collection *its_create_collection(u16 col_id, u32 target_pe);
 
 #endif /* _ASMARM64_GIC_V3_ITS_H_ */
diff --git a/lib/arm64/gic-v3-its.c b/lib/arm64/gic-v3-its.c
index cf176b7..ca91c3d 100644
--- a/lib/arm64/gic-v3-its.c
+++ b/lib/arm64/gic-v3-its.c
@@ -109,3 +109,41 @@ void its_enable_defaults(void)
 
        writel(GITS_CTLR_ENABLE, its_data.base + GITS_CTLR);
 }
+
+struct its_device *its_create_device(u32 device_id, int nr_ites)
+{
+       struct its_device *new;
+       unsigned long n;
+
+       assert(its_data.nr_devices < GITS_MAX_DEVICES);
+
+       new = &its_data.devices[its_data.nr_devices];
+
+       new->device_id = device_id;
+       new->nr_ites = nr_ites;
+
+       n = (its_data.typer.ite_size * nr_ites) >> PAGE_SHIFT;
+       new->itt = alloc_pages(get_order(n));
+
+       its_data.nr_devices++;
+       return new;
+}
+
+struct its_collection *its_create_collection(u16 col_id, u32 pe)
+{
+       struct its_collection *new;
+
+       assert(its_data.nr_collections < GITS_MAX_COLLECTIONS);
+
+       new = &its_data.collections[its_data.nr_collections];
+
+       new->col_id = col_id;
+
+       if (its_data.typer.pta)
+               new->target_address = (u64)gicv3_data.redist_base[pe];
+       else
+               new->target_address = pe << 16;
+
+       its_data.nr_collections++;
+       return new;
+}
-- 
2.20.1