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@xxxxxxxxxx>
---
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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