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irqchip/gic-v3-its: Recompute the number of pages on page size change

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When the programming of a GITS_BASERn register fails because of
an unsupported ITS page size, we retry it with a smaller page size.
Unfortunately, we don't recompute the number of allocated ITS pages,
indicating the wrong value computed in the original allocation.

A convenient fix is to free the pages we allocated, update the
page size, and restart the allocation. This will ensure that
we always allocate the right amount in the case of a device
table, specially if we have to reduce the allocation order
to stay within the boundaries of the ITS maximum allocation.

Reported-and-tested-by: Ma Jun <majun258@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1453818255-1289-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Marc Zyngier 2016-01-26 14:24:15 +00:00 committed by Thomas Gleixner
parent bb1a793125
commit 18aa60ce27
1 changed files with 6 additions and 2 deletions
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8
drivers/irqchip/irq-gic-v3-its.c
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@ -875,6 +875,7 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
}
alloc_size = (1 << order) * PAGE_SIZE;
retry_alloc_baser:
alloc_pages = (alloc_size / psz);
if (alloc_pages > GITS_BASER_PAGES_MAX) {
alloc_pages = GITS_BASER_PAGES_MAX;
@ -938,13 +939,16 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
* size and retry. If we reach 4K, then
* something is horribly wrong...
*/
free_pages((unsigned long)base, order);
its->tables[i] = NULL;
switch (psz) {
case SZ_16K:
psz = SZ_4K;
goto retry_baser;
goto retry_alloc_baser;
case SZ_64K:
psz = SZ_16K;
goto retry_baser;
goto retry_alloc_baser;
}
}