Commit c6e2ccb6 authored Jun 26, 2018 by Marc Zyngier

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@arm.com>
Tested-by: Bhupesh Sharma <bhsharma@redhat.com>
Tested-by: Lei Zhang <zhang.lei@jp.fujitsu.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

parent c440a9d9

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

+8 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}