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genirq/msi: Split msi_domain_alloc_irq_at()

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In preparation for providing a special allocation function for wired
interrupts which are connected to a wire to MSI bridge, split the inner
workings of msi_domain_alloc_irq_at() out into a helper function so the
code can be shared.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240127161753.114685-9-apatel@ventanamicro.com
This commit is contained in:
Thomas Gleixner
2024-02-15 17:55:40 +01:00
parent 9c78c1a85c
commit 3095cc0d5b
1 changed files with 47 additions and 37 deletions
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kernel/irq/msi.c
+47 -37
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@@ -1446,6 +1446,51 @@ int msi_domain_alloc_irqs_all_locked(struct device *dev, unsigned int domid, int
return msi_domain_alloc_locked(dev, &ctrl);
}
static struct msi_map __msi_domain_alloc_irq_at(struct device *dev, unsigned int domid,
unsigned int index,
const struct irq_affinity_desc *affdesc,
union msi_instance_cookie *icookie)
{
struct msi_ctrl ctrl = { .domid = domid, .nirqs = 1, };
struct irq_domain *domain;
struct msi_map map = { };
struct msi_desc *desc;
int ret;
domain = msi_get_device_domain(dev, domid);
if (!domain) {
map.index = -ENODEV;
return map;
}
desc = msi_alloc_desc(dev, 1, affdesc);
if (!desc) {
map.index = -ENOMEM;
return map;
}
if (icookie)
desc->data.icookie = *icookie;
ret = msi_insert_desc(dev, desc, domid, index);
if (ret) {
map.index = ret;
return map;
}
ctrl.first = ctrl.last = desc->msi_index;
ret = __msi_domain_alloc_irqs(dev, domain, &ctrl);
if (ret) {
map.index = ret;
msi_domain_free_locked(dev, &ctrl);
} else {
map.index = desc->msi_index;
map.virq = desc->irq;
}
return map;
}
/**
* msi_domain_alloc_irq_at - Allocate an interrupt from a MSI interrupt domain at
* a given index - or at the next free index
@@ -1475,45 +1520,10 @@ struct msi_map msi_domain_alloc_irq_at(struct device *dev, unsigned int domid, u
const struct irq_affinity_desc *affdesc,
union msi_instance_cookie *icookie)
{
struct msi_ctrl ctrl = { .domid = domid, .nirqs = 1, };
struct irq_domain *domain;
struct msi_map map = { };
struct msi_desc *desc;
int ret;
struct msi_map map;
msi_lock_descs(dev);
domain = msi_get_device_domain(dev, domid);
if (!domain) {
map.index = -ENODEV;
goto unlock;
}
desc = msi_alloc_desc(dev, 1, affdesc);
if (!desc) {
map.index = -ENOMEM;
goto unlock;
}
if (icookie)
desc->data.icookie = *icookie;
ret = msi_insert_desc(dev, desc, domid, index);
if (ret) {
map.index = ret;
goto unlock;
}
ctrl.first = ctrl.last = desc->msi_index;
ret = __msi_domain_alloc_irqs(dev, domain, &ctrl);
if (ret) {
map.index = ret;
msi_domain_free_locked(dev, &ctrl);
} else {
map.index = desc->msi_index;
map.virq = desc->irq;
}
unlock:
map = __msi_domain_alloc_irq_at(dev, domid, index, affdesc, icookie);
msi_unlock_descs(dev);
return map;
}