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irqchip: GICv3: ITS: device allocation and configuration

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The ITS has a notion of "device" that can write to it in order to
generate an interrupt.

Conversly, the driver maintains a per-ITS list of devices, together
with their configuration information, and uses this to configure
the HW.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1416839720-18400-9-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Marc Zyngier 2014-11-24 14:35:15 +00:00 committed by Jason Cooper
parent 1ac19ca6bf
commit 84a6a2e7fc
1 changed files with 74 additions and 0 deletions
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74
drivers/irqchip/irq-gic-v3-its.c
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@ -981,3 +981,77 @@ static void its_cpu_init_collection(void)
spin_unlock(&its_lock); spin_unlock(&its_lock);
} }
static struct its_device *its_find_device(struct its_node *its, u32 dev_id)
{
struct its_device *its_dev = NULL, *tmp;
raw_spin_lock(&its->lock);
list_for_each_entry(tmp, &its->its_device_list, entry) {
if (tmp->device_id == dev_id) {
its_dev = tmp;
break;
}
}
raw_spin_unlock(&its->lock);
return its_dev;
}
static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
int nvecs)
{
struct its_device *dev;
unsigned long *lpi_map;
void *itt;
int lpi_base;
int nr_lpis;
int cpu;
int sz;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
sz = nvecs * its->ite_size;
sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
itt = kmalloc(sz, GFP_KERNEL);
lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis);
if (!dev || !itt || !lpi_map) {
kfree(dev);
kfree(itt);
kfree(lpi_map);
return NULL;
}
dev->its = its;
dev->itt = itt;
dev->nr_ites = nvecs;
dev->lpi_map = lpi_map;
dev->lpi_base = lpi_base;
dev->nr_lpis = nr_lpis;
dev->device_id = dev_id;
INIT_LIST_HEAD(&dev->entry);
raw_spin_lock(&its->lock);
list_add(&dev->entry, &its->its_device_list);
raw_spin_unlock(&its->lock);
/* Bind the device to the first possible CPU */
cpu = cpumask_first(cpu_online_mask);
dev->collection = &its->collections[cpu];
/* Map device to its ITT */
its_send_mapd(dev, 1);
return dev;
}
static void its_free_device(struct its_device *its_dev)
{
raw_spin_lock(&its_dev->its->lock);
list_del(&its_dev->entry);
raw_spin_unlock(&its_dev->its->lock);
kfree(its_dev->itt);
kfree(its_dev);
}