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genirq/msi: Provide msi_domain_alloc/free_irqs_descs_locked()

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Usage sites which do allocations of the MSI descriptors before invoking
msi_domain_alloc_irqs() require to lock the MSI decriptors accross the
operation.

Provide entry points which can be called with the MSI mutex held and lock
the mutex in the existing entry points.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210747.765371053@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:51:07 +01:00
parent b5f687f97d
commit 0f62d941ac
2 changed files with 71 additions and 26 deletions
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3
include/linux/msi.h
View File

@ -383,9 +383,12 @@ struct irq_domain *msi_create_irq_domain(struct fwnode_handle *fwnode,
struct irq_domain *parent);
int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec);
int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device *dev,
int nvec);
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec);
void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev);
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev);
struct msi_domain_info *msi_get_domain_info(struct irq_domain *domain);

94
kernel/irq/msi.c
View File

@ -672,10 +672,8 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,
dev_to_node(dev), &arg, false,
desc->affinity);
if (virq < 0) {
ret = msi_handle_pci_fail(domain, desc, allocated);
goto cleanup;
}
if (virq < 0)
return msi_handle_pci_fail(domain, desc, allocated);
for (i = 0; i < desc->nvec_used; i++) {
irq_set_msi_desc_off(virq, i, desc);
@ -709,7 +707,7 @@ int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
}
ret = irq_domain_activate_irq(irq_data, can_reserve);
if (ret)
goto cleanup;
return ret;
}
skip_activate:
@ -724,9 +722,44 @@ skip_activate:
}
}
return 0;
}
/**
* msi_domain_alloc_irqs_descs_locked - Allocate interrupts from a MSI interrupt domain
* @domain: The domain to allocate from
* @dev: Pointer to device struct of the device for which the interrupts
* are allocated
* @nvec: The number of interrupts to allocate
*
* Must be invoked from within a msi_lock_descs() / msi_unlock_descs()
* pair. Use this for MSI irqdomains which implement their own vector
* allocation/free.
*
* Return: %0 on success or an error code.
*/
int msi_domain_alloc_irqs_descs_locked(struct irq_domain *domain, struct device *dev,
int nvec)
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
int ret;
lockdep_assert_held(&dev->msi.data->mutex);
ret = ops->domain_alloc_irqs(domain, dev, nvec);
if (ret)
goto cleanup;
if (!(info->flags & MSI_FLAG_DEV_SYSFS))
return 0;
ret = msi_device_populate_sysfs(dev);
if (ret)
goto cleanup;
return 0;
cleanup:
msi_domain_free_irqs(domain, dev);
msi_domain_free_irqs_descs_locked(domain, dev);
return ret;
}
@ -739,23 +772,13 @@ cleanup:
*
* Return: %0 on success or an error code.
*/
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev,
int nvec)
int msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, int nvec)
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
int ret;
ret = ops->domain_alloc_irqs(domain, dev, nvec);
if (ret)
return ret;
if (!(info->flags & MSI_FLAG_DEV_SYSFS))
return 0;
ret = msi_device_populate_sysfs(dev);
if (ret)
msi_domain_free_irqs(domain, dev);
msi_lock_descs(dev);
ret = msi_domain_alloc_irqs_descs_locked(domain, dev, nvec);
msi_unlock_descs(dev);
return ret;
}
@ -784,6 +807,28 @@ void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
}
}
/**
* msi_domain_free_irqs_descs_locked - Free interrupts from a MSI interrupt @domain associated to @dev
* @domain: The domain to managing the interrupts
* @dev: Pointer to device struct of the device for which the interrupts
* are free
*
* Must be invoked from within a msi_lock_descs() / msi_unlock_descs()
* pair. Use this for MSI irqdomains which implement their own vector
* allocation.
*/
void msi_domain_free_irqs_descs_locked(struct irq_domain *domain, struct device *dev)
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
lockdep_assert_held(&dev->msi.data->mutex);
if (info->flags & MSI_FLAG_DEV_SYSFS)
msi_device_destroy_sysfs(dev);
ops->domain_free_irqs(domain, dev);
}
/**
* msi_domain_free_irqs - Free interrupts from a MSI interrupt @domain associated to @dev
* @domain: The domain to managing the interrupts
@ -792,12 +837,9 @@ void __msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
*/
void msi_domain_free_irqs(struct irq_domain *domain, struct device *dev)
{
struct msi_domain_info *info = domain->host_data;
struct msi_domain_ops *ops = info->ops;
if (info->flags & MSI_FLAG_DEV_SYSFS)
msi_device_destroy_sysfs(dev);
ops->domain_free_irqs(domain, dev);
msi_lock_descs(dev);
msi_domain_free_irqs_descs_locked(domain, dev);
msi_unlock_descs(dev);
}
/**