Commit-ID: c6e2ccb66d0c3b4fffc59932585e9f709ad59003
Gitweb: https://git.kernel.org/tip/c6e2ccb66d0c3b4fffc59932585e9f709ad59003
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Tue, 26 Jun 2018 11:21:11 +0100
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Tue, 2 Oct 2018 10:37:35 +0100
irqchip/gic-v3-its: Use pre-programmed redistributor tables with kdump kernels
If using a kdump kernel, and that we cannot disable LPIs to install
our own tables, let's switch to using the already allocated tables.
This means that we'll change some of the initial kernel's memory,
but at least we'll be able to have LPIs in this secondary kernel.
Tested-by: Jeremy Linton <jeremy.linton@xxxxxxx>
Tested-by: Bhupesh Sharma <bhsharma@xxxxxxxxxx>
Tested-by: Lei Zhang <zhang.lei@xxxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/irqchip/irq-gic-v3-its.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 6a9066411cbc..83d5573f56e9 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -19,6 +19,7 @@
#include <linux/acpi_iort.h>
#include <linux/bitmap.h>
#include <linux/cpu.h>
+#include <linux/crash_dump.h>
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/interrupt.h>
@@ -1963,8 +1964,15 @@ static void its_free_pending_table(struct page *pt)
free_pages((unsigned long)page_address(pt), get_order(LPI_PENDBASE_SZ));
}
+/*
+ * Booting with kdump and LPIs enabled is generally fine.
+ */
static bool enabled_lpis_allowed(void)
{
+ /* Allow a kdump kernel */
+ if (is_kdump_kernel())
+ return true;
+
return false;
}
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