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irqchip/gicv3-its: Avoid cache flush beyond ITS_BASERn memory size 

Function its_alloc_tables() maintains two local variables, "order" and
and "alloc_size", to hold memory size that has been allocated to
ITS_BASEn. We don't always refresh the variable alloc_size whenever
value of the variable order changes, causing the following two
problems.

  - Cache flush operation with size more than required.
  - Information reported by pr_info is not correct.

Use a helper macro that converts page order to size in bytes instead of
variable "alloc_size" to fix both the problems.

Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Shanker Donthineni 2016-02-16 18:00:36 -06:00 committed by Marc Zyngier
parent 004fa08d7a
commit 2eca0d6cee
1 changed files with 6 additions and 5 deletions
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11
drivers/irqchip/irq-gic-v3-its.c
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@ -78,6 +78,9 @@ struct its_node {
#define ITS_ITT_ALIGN SZ_256
/* Convert page order to size in bytes */
#define PAGE_ORDER_TO_SIZE(o) (PAGE_SIZE << (o))
struct event_lpi_map {
unsigned long *lpi_map;
u16 *col_map;
@ -841,7 +844,6 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
u64 type = GITS_BASER_TYPE(val);
u64 entry_size = GITS_BASER_ENTRY_SIZE(val);
int order = get_order(psz);
int alloc_size;
int alloc_pages;
u64 tmp;
void *base;
@ -873,9 +875,8 @@ 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);
alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
if (alloc_pages > GITS_BASER_PAGES_MAX) {
alloc_pages = GITS_BASER_PAGES_MAX;
order = get_order(GITS_BASER_PAGES_MAX * psz);
@ -928,7 +929,7 @@ retry_baser:
shr = tmp & GITS_BASER_SHAREABILITY_MASK;
if (!shr) {
cache = GITS_BASER_nC;
__flush_dcache_area(base, alloc_size);
__flush_dcache_area(base, PAGE_ORDER_TO_SIZE(order));
}
goto retry_baser;
}
@ -961,7 +962,7 @@ retry_baser:
}
pr_info("ITS: allocated %d %s @%lx (psz %dK, shr %d)\n",
(int)(alloc_size / entry_size),
(int)(PAGE_ORDER_TO_SIZE(order) / entry_size),
its_base_type_string[type],
(unsigned long)virt_to_phys(base),
psz / SZ_1K, (int)shr >> GITS_BASER_SHAREABILITY_SHIFT);