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

[Eric Auger]

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 <address@hidden>

---

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