[kvm-unit-tests PATCH v2 07/16] arm/arm64: ITS: Set the LPI config and pending tables

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

Allocate the LPI configuration and per re-distributor pending table.
Set redistributor's PROPBASER and PENDBASER. The LPIs are enabled
by default in the config table.

Also introduce a helper routine that allows to set the pending table
bit for a given LPI.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---

v1 -> v2:
- remove memory attributes
---
 lib/arm/asm/gic-v3-its.h |  3 ++
 lib/arm/asm/gic-v3.h     | 12 ++++++++
 lib/arm/gic-v3-its.c     | 60 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 75 insertions(+)

diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
index 5a4dfe9..2f8b8f1 100644
--- a/lib/arm/asm/gic-v3-its.h
+++ b/lib/arm/asm/gic-v3-its.h
@@ -90,6 +90,9 @@ extern void its_init(void);
 extern int its_parse_baser(int i, struct its_baser *baser);
 extern void its_setup_baser(int i, struct its_baser *baser);
 extern struct its_baser *its_lookup_baser(int type);
+extern void set_lpi_config(int n, u8 val);
+extern u8 get_lpi_config(int n);
+extern void set_pending_table_bit(int rdist, int n, bool set);
 
 #endif /* !__ASSEMBLY__ */
 #endif /* _ASMARM_GIC_V3_ITS_H_ */
diff --git a/lib/arm/asm/gic-v3.h b/lib/arm/asm/gic-v3.h
index ffb2e26..90a7304 100644
--- a/lib/arm/asm/gic-v3.h
+++ b/lib/arm/asm/gic-v3.h
@@ -48,6 +48,16 @@
 #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
 	(MPIDR_AFFINITY_LEVEL(cluster_id, level) << ICC_SGI1R_AFFINITY_## level ## _SHIFT)
 
+#define GICR_PROPBASER_IDBITS_MASK                      (0x1f)
+
+#define GICR_PENDBASER_PTZ                              BIT_ULL(62)
+
+#define LPI_PROP_GROUP1		(1 << 1)
+#define LPI_PROP_ENABLED	(1 << 0)
+#define LPI_PROP_DEFAULT_PRIO   0xa0
+#define LPI_PROP_DEFAULT	(LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1 | \
+				 LPI_PROP_ENABLED)
+
 #include <asm/arch_gicv3.h>
 
 #ifndef __ASSEMBLY__
@@ -64,6 +74,8 @@ struct gicv3_data {
 	void *dist_base;
 	void *redist_bases[GICV3_NR_REDISTS];
 	void *redist_base[NR_CPUS];
+	void *lpi_prop;
+	void *lpi_pend[NR_CPUS];
 	unsigned int irq_nr;
 };
 extern struct gicv3_data gicv3_data;
diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c
index 79946c3..6c97569 100644
--- a/lib/arm/gic-v3-its.c
+++ b/lib/arm/gic-v3-its.c
@@ -117,3 +117,63 @@ void its_setup_baser(int i, struct its_baser *baser)
 	writeq(val, gicv3_its_base() + GITS_BASER + i * 8);
 }
 
+inline void set_lpi_config(int n, u8 value)
+{
+	u8 *entry = (u8 *)(gicv3_data.lpi_prop + (n - 8192));
+	*entry = value;
+}
+
+inline u8 get_lpi_config(int n)
+{
+	u8 *entry = (u8 *)(gicv3_data.lpi_prop + (n - 8192));
+	return *entry;
+}
+
+/* alloc_lpi_tables: Allocate LPI config and pending tables */
+void alloc_lpi_tables(void);
+void alloc_lpi_tables(void)
+{
+	unsigned long n = SZ_64K >> PAGE_SHIFT;
+	unsigned long order = fls(n);
+	u64 prop_val;
+	int cpu;
+
+	gicv3_data.lpi_prop = (void *)virt_to_phys(alloc_pages(order));
+
+	/* ID bits = 13, ie. up to 14b LPI INTID */
+	prop_val = (u64)gicv3_data.lpi_prop | 13;
+
+	/*
+	 * Allocate pending tables for each redistributor
+	 * and set PROPBASER and PENDBASER
+	 */
+	for_each_present_cpu(cpu) {
+		u64 pend_val;
+		void *ptr;
+
+		ptr = gicv3_data.redist_base[cpu];
+
+		writeq(prop_val, ptr + GICR_PROPBASER);
+
+		gicv3_data.lpi_pend[cpu] =
+			(void *)virt_to_phys(alloc_pages(order));
+
+		pend_val = (u64)gicv3_data.lpi_pend[cpu];
+
+		writeq(pend_val, ptr + GICR_PENDBASER);
+	}
+}
+
+void set_pending_table_bit(int rdist, int n, bool set)
+{
+	u8 *ptr = phys_to_virt((phys_addr_t)gicv3_data.lpi_pend[rdist]);
+	u8 mask = 1 << (n % 8), byte;
+
+	ptr += (n / 8);
+	byte = *ptr;
+	if (set)
+		byte |=  mask;
+	else
+		byte &= ~mask;
+	*ptr = byte;
+}
-- 
2.20.1

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