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irqchip/gicv3-its: Add a new function for parsing device table BASERn

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Only the device table BASERn needs to be handled differently as
compared to all other tables. So, adding a separate function for
easy code maintenance and improved code readability.

Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Shanker Donthineni 2016-06-06 18:17:29 -05:00 committed by Marc Zyngier
parent 2d81d425b6
commit 4b75c4598b
1 changed files with 26 additions and 23 deletions
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49
drivers/irqchip/irq-gic-v3-its.c
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@ -840,6 +840,30 @@ static void its_write_baser(struct its_node *its, struct its_baser *baser,
baser->val = its_read_baser(its, baser);
}
static void its_parse_baser_device(struct its_node *its, struct its_baser *baser,
u32 *order)
{
u64 esz = GITS_BASER_ENTRY_SIZE(its_read_baser(its, baser));
u32 ids = its->device_ids;
u32 new_order = *order;
/*
* Allocate as many entries as required to fit the
* range of device IDs that the ITS can grok... The ID
* space being incredibly sparse, this results in a
* massive waste of memory.
*/
new_order = max_t(u32, get_order(esz << ids), new_order);
if (new_order >= MAX_ORDER) {
new_order = MAX_ORDER - 1;
ids = ilog2(PAGE_ORDER_TO_SIZE(new_order) / esz);
pr_warn("ITS@%pa: Device Table too large, reduce ids %u->%u\n",
&its->phys_base, its->device_ids, ids);
}
*order = new_order;
}
static void its_free_tables(struct its_node *its)
{
int i;
@ -891,29 +915,8 @@ static int its_alloc_tables(const char *node_name, struct its_node *its)
if (type == GITS_BASER_TYPE_NONE)
continue;
/*
* Allocate as many entries as required to fit the
* range of device IDs that the ITS can grok... The ID
* space being incredibly sparse, this results in a
* massive waste of memory.
*
* For other tables, only allocate a single page.
*/
if (type == GITS_BASER_TYPE_DEVICE) {
/*
* 'order' was initialized earlier to the default page
* granule of the the ITS. We can't have an allocation
* smaller than that. If the requested allocation
* is smaller, round up to the default page granule.
*/
order = max(get_order((1UL << ids) * entry_size),
order);
if (order >= MAX_ORDER) {
order = MAX_ORDER - 1;
pr_warn("%s: Device Table too large, reduce its page order to %u\n",
node_name, order);
}
}
if (type == GITS_BASER_TYPE_DEVICE)
its_parse_baser_device(its, baser, &order);
retry_alloc_baser:
alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);