irqchip/gic-v3-its: Split property table clearing from allocation

mainline inclusion
from 4.20-rc1
commit: 053be4854f9bcceba99cdfa0c89acc4696852c3f
category: kdump
bugzilla: 5272
CVE: NA

This 10 patches is used for secondary kernel using LPI.

[PATCH 01/10] irqchip/gic-v3-its: Change initialization ordering for LPIs
[PATCH 02/10] irqchip/gic-v3-its: Simplify LPI_PENDBASE_SZ usage
[PATCH 03/10] irqchip/gic-v3-its: Split property table clearing from allocation
[PATCH 04/10] irqchip/gic-v3-its: Move pending table allocation to init time
[PATCH 05/10] irqchip/gic-v3-its: Keep track of property table's PA and VA
[PATCH 06/10] irqchip/gic-v3-its: Allow use of pre-programmed LPI tables
[PATCH 07/10] irqchip/gic-v3-its: Use pre-programmed redistributor tables with kdump kernels
[PATCH 08/10] irqchip/gic-v3-its: Check that all RDs have the same property table
[PATCH 09/10] irqchip/gic-v3-its: Register LPI tables with EFI config table
[PATCH 10/10] irqchip/gic-v3-its: Allow use of LPI tables in reserved memory

--------------------------------------

As we're going to reuse some pre-allocated memory for the property
table, split out the zeroing of that table into a separate function
for later use.
Tested-by: NJeremy Linton <jeremy.linton@arm.com>
Tested-by: NBhupesh Sharma <bhsharma@redhat.com>
Tested-by: NLei Zhang <zhang.lei@jp.fujitsu.com>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NHanjun Guo <guohanjun@huawei.com>

drivers/irqchip/irq-gic-v3-its.c

@@ -1597,6 +1597,15 @@ static void its_lpi_free(unsigned long *bitmap, u32 base, u32 nr_ids)
 	kfree(bitmap);
 }
 
+static void gic_reset_prop_table(void *va)
+{
+	/* Priority 0xa0, Group-1, disabled */
+	memset(va, LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1, LPI_PROPBASE_SZ);
+
+	/* Make sure the GIC will observe the written configuration */
+	gic_flush_dcache_to_poc(va, LPI_PROPBASE_SZ);
+}
+
 static struct page *its_allocate_prop_table(gfp_t gfp_flags)
 {
 	struct page *prop_page;
@@ -1605,13 +1614,7 @@ static struct page *its_allocate_prop_table(gfp_t gfp_flags)
 	if (!prop_page)
 		return NULL;
 
-	/* Priority 0xa0, Group-1, disabled */
-	memset(page_address(prop_page),
-	       LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1,
-	       LPI_PROPBASE_SZ);
-
-	/* Make sure the GIC will observe the written configuration */
-	gic_flush_dcache_to_poc(page_address(prop_page), LPI_PROPBASE_SZ);
+	gic_reset_prop_table(page_address(prop_page));
 
 	return prop_page;
 }