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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>
This commit is contained in:
Marc Zyngier 2018-06-26 11:21:11 +01:00
parent c440a9d9d1
commit c6e2ccb66d
1 changed files with 8 additions and 0 deletions
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8
drivers/irqchip/irq-gic-v3-its.c
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@ -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;
}