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

[Eric Auger <eric.auger@redhat.com>]

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 <eric.auger@redhat.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>

---

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