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irqchip/gic-v3-its: Generalize device table allocation

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As we want to use 2-level tables for VCPUs, let's hack the device
table allocator in order to make it slightly more generic. It
will get reused in subsequent patches.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-19 18:53:02 +00:00
parent cf2be8ba6f
commit 70cc81edc0
1 changed files with 16 additions and 10 deletions
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26
drivers/irqchip/irq-gic-v3-its.c
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@ -1392,26 +1392,19 @@ static struct its_baser *its_get_baser(struct its_node *its, u32 type)
return NULL;
}
static bool its_alloc_device_table(struct its_node *its, u32 dev_id)
static bool its_alloc_table_entry(struct its_baser *baser, u32 id)
{
struct its_baser *baser;
struct page *page;
u32 esz, idx;
__le64 *table;
baser = its_get_baser(its, GITS_BASER_TYPE_DEVICE);
/* Don't allow device id that exceeds ITS hardware limit */
if (!baser)
return (ilog2(dev_id) < its->device_ids);
/* Don't allow device id that exceeds single, flat table limit */
esz = GITS_BASER_ENTRY_SIZE(baser->val);
if (!(baser->val & GITS_BASER_INDIRECT))
return (dev_id < (PAGE_ORDER_TO_SIZE(baser->order) / esz));
return (id < (PAGE_ORDER_TO_SIZE(baser->order) / esz));
/* Compute 1st level table index & check if that exceeds table limit */
idx = dev_id >> ilog2(baser->psz / esz);
idx = id >> ilog2(baser->psz / esz);
if (idx >= (PAGE_ORDER_TO_SIZE(baser->order) / GITS_LVL1_ENTRY_SIZE))
return false;
@ -1440,6 +1433,19 @@ static bool its_alloc_device_table(struct its_node *its, u32 dev_id)
return true;
}
static bool its_alloc_device_table(struct its_node *its, u32 dev_id)
{
struct its_baser *baser;
baser = its_get_baser(its, GITS_BASER_TYPE_DEVICE);
/* Don't allow device id that exceeds ITS hardware limit */
if (!baser)
return (ilog2(dev_id) < its->device_ids);
return its_alloc_table_entry(baser, dev_id);
}
static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
int nvecs)
{