[kvm-unit-tests PATCH v5 05/13] arm/arm64: gicv3: 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>

---

v4 -> v5:
- Moved some reformattings previously done in
  "arm/arm64: ITS: its_enable_defaults", in this patch
- added assert(!gicv3_redist_base()) in gicv3_lpi_alloc_tables()
- revert for_each_present_cpu() change

v2 -> v3:
- Move the helpers in lib/arm/gic-v3.c and prefix them with "gicv3_"
  and add _lpi prefix too

v1 -> v2:
- remove memory attributes
---
 lib/arm/asm/gic-v3.h | 15 +++++++++++++
 lib/arm/gic-v3.c     | 53 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/lib/arm/asm/gic-v3.h b/lib/arm/asm/gic-v3.h
index 47df051..064cc68 100644
--- a/lib/arm/asm/gic-v3.h
+++ b/lib/arm/asm/gic-v3.h
@@ -50,6 +50,15 @@
 #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__
@@ -66,6 +75,8 @@ struct gicv3_data {
        void *dist_base;
        void *redist_bases[GICV3_NR_REDISTS];
        void *redist_base[NR_CPUS];
+       u8 *lpi_prop;
+       void *lpi_pend[NR_CPUS];
        unsigned int irq_nr;
 };
 extern struct gicv3_data gicv3_data;
@@ -82,6 +93,10 @@ extern void gicv3_write_eoir(u32 irqstat);
 extern void gicv3_ipi_send_single(int irq, int cpu);
 extern void gicv3_ipi_send_mask(int irq, const cpumask_t *dest);
 extern void gicv3_set_redist_base(size_t stride);
+extern void gicv3_lpi_set_config(int n, u8 val);
+extern u8 gicv3_lpi_get_config(int n);
+extern void gicv3_lpi_set_clr_pending(int rdist, int n, bool set);
+extern void gicv3_lpi_alloc_tables(void);
 
 static inline void gicv3_do_wait_for_rwp(void *base)
 {
diff --git a/lib/arm/gic-v3.c b/lib/arm/gic-v3.c
index feecb5e..d752bd4 100644
--- a/lib/arm/gic-v3.c
+++ b/lib/arm/gic-v3.c
@@ -5,6 +5,7 @@
  */
 #include <asm/gic.h>
 #include <asm/io.h>
+#include <alloc_page.h>
 
 void gicv3_set_redist_base(size_t stride)
 {
@@ -147,3 +148,55 @@ void gicv3_ipi_send_single(int irq, int cpu)
        cpumask_set_cpu(cpu, &dest);
        gicv3_ipi_send_mask(irq, &dest);
 }
+
+#if defined(__aarch64__)
+
+/*
+ * alloc_lpi_tables - Allocate LPI config and pending tables
+ * and set PROPBASER (shared by all rdistributors) and per
+ * redistributor PENDBASER.
+ *
+ * gicv3_set_redist_base() must be called before
+ */
+void gicv3_lpi_alloc_tables(void)
+{
+       unsigned long n = SZ_64K >> PAGE_SHIFT;
+       unsigned long order = fls(n);
+       u64 prop_val;
+       int cpu;
+
+       assert(!gicv3_redist_base());
+
+       gicv3_data.lpi_prop = alloc_pages(order);
+
+       /* ID bits = 13, ie. up to 14b LPI INTID */
+       prop_val = (u64)(virt_to_phys(gicv3_data.lpi_prop)) | 13;
+
+       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] = alloc_pages(order);
+               pend_val = (u64)(virt_to_phys(gicv3_data.lpi_pend[cpu]));
+               writeq(pend_val, ptr + GICR_PENDBASER);
+       }
+}
+
+void gicv3_lpi_set_clr_pending(int rdist, int n, bool set)
+{
+       u8 *ptr = 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;
+}
+#endif /* __aarch64__ */
-- 
2.20.1