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[kvm-unit-tests,RFC,08/15] arm/arm64: ITS: enable LPIs at re-distributor level

Message ID 1480974406-29345-9-git-send-email-eric.auger@redhat.com
State New
Headers show

Commit Message

Eric Auger Dec. 5, 2016, 9:46 p.m. UTC 
This helper function enables the signaling of LPIs by the
redistributor to the connected PE.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
 lib/arm/asm/gic-v3-its.h |  1 +
 lib/arm/gic-v3-its.c     | 15 +++++++++++++++
 2 files changed, 16 insertions(+)
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Patch

diff --git a/lib/arm/asm/gic-v3-its.h b/lib/arm/asm/gic-v3-its.h
index 21054cb..3e36a2a 100644
--- a/lib/arm/asm/gic-v3-its.h
+++ b/lib/arm/asm/gic-v3-its.h
@@ -145,6 +145,7 @@  extern struct its_data its_data;
 
 extern int its_parse_baser(int i, struct its_baser *baser);
 extern void its_setup_baser(int i, struct its_baser *baser);
+extern void enable_lpi(u32 redist);
 
 
 #endif /* !__ASSEMBLY__ */
diff --git a/lib/arm/gic-v3-its.c b/lib/arm/gic-v3-its.c
index f577d5f..7c768a5 100644
--- a/lib/arm/gic-v3-its.c
+++ b/lib/arm/gic-v3-its.c
@@ -171,3 +171,18 @@  void init_cmd_queue(void)
 	writeq(0, its_data.base + GITS_CWRITER);
 	writeq(0, its_data.base + GITS_CREADR);
 }
+
+void enable_lpi(u32 redist)
+{
+	void *ptr;
+	u64 val;
+
+	if (redist >= gicv3_data.cpu_count)
+		report_abort("%s redist=%d >= cpu_count=%d\n",
+			     __func__, redist, gicv3_data.cpu_count);
+
+	ptr = gicv3_data.redist_base[redist];
+	val = readl(ptr + GICR_CTLR);
+	val |= GICR_CTLR_ENABLE_LPIS;
+	writel(val,  ptr + GICR_CTLR);
+}