[PATCHv3] arm64: gic-v3-its: Clear the Pending table before enabling LPIs

[Zhiqiang Hou]

From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>

The GICv3 RM requires "The first 1KB of memory for the LPI Pending tables
must contain only zeros on initial allocation, and this must be visible
to the Redistributors, or else the effect is UNPREDICTABLE".

And as the following statement, we here clear the whole Pending tables
instead of the first 1KB.
"An LPI Pending table that contains only zeros, including in the first 1KB,
indicates that there are no pending LPIs.
The first 1KB of the LPI Pending table is IMPLEMENTATION DEFINED. However,
if the first 1KB of the LPI Pending table and the rest of the table contain
only zeros, this must indicate that there are no pending LPIs."

And there isn't any pending LPI under U-Boot, so it's unnecessary to
load the contents of the Pending table during the enablement, then set
the GICR_PENDBASER.PTZ flag.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
---
V3:
 - Fix a mistake code delete in v2.

 arch/arm/lib/gic-v3-its.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib/gic-v3-its.c b/arch/arm/lib/gic-v3-its.c
index f5a921b3d1..2d3fdb600e 100644
--- a/arch/arm/lib/gic-v3-its.c
+++ b/arch/arm/lib/gic-v3-its.c
@@ -3,6 +3,7 @@
  * Copyright 2019 Broadcom.
  */
 #include <common.h>
+#include <cpu_func.h>
 #include <dm.h>
 #include <regmap.h>
 #include <syscon.h>
@@ -108,6 +109,8 @@ int gic_lpi_tables_init(void)
 	int i;
 	u64 redist_lpi_base;
 	u64 pend_base;
+	ulong pend_tab_total_sz;
+	void *pend_tab_va;
 
 	if (gic_v3_its_get_gic_addr(&priv))
 		return -EINVAL;
@@ -161,6 +164,12 @@ int gic_lpi_tables_init(void)
 	}
 
 	redist_lpi_base = priv.lpi_base + LPI_PROPBASE_SZ;
+	pend_tab_total_sz = priv.num_redist * LPI_PENDBASE_SZ;
+	pend_tab_va = map_physmem(redist_lpi_base, pend_tab_total_sz,
+				  MAP_NOCACHE);
+	memset(pend_tab_va, 0, pend_tab_total_sz);
+	flush_cache((ulong)pend_tab_va, pend_tab_total_sz);
+	unmap_physmem(pend_tab_va, MAP_NOCACHE);
 
 	pend_base = priv.gicr_base + GICR_PENDBASER;
 	for (i = 0; i < priv.num_redist; i++) {
@@ -168,7 +177,8 @@ int gic_lpi_tables_init(void)
 
 		val = ((redist_lpi_base + (i * LPI_PENDBASE_SZ)) |
 			GICR_PENDBASER_INNERSHAREABLE |
-			GICR_PENDBASER_RAWAWB);
+			GICR_PENDBASER_RAWAWB |
+			GICR_PENDBASER_PTZ);
 
 		writeq(val, (uintptr_t)(pend_base + offset));
 		tmp = readq((uintptr_t)(pend_base + offset));
-- 
2.17.1