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genirq/msi: Provide msi_match_device_domain()

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Provide an interface to match a per device domain bus token. This allows to
query which type of domain is installed for a particular domain id. Will be
used for PCI to avoid frequent create/remove cycles for the MSI resp. MSI-X
domains.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124232325.738047902@linutronix.de
This commit is contained in:
Thomas Gleixner 2022-11-25 00:25:57 +01:00
parent 27a6dea3eb
commit 26e91b75bf
2 changed files with 28 additions and 0 deletions
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3
include/linux/msi.h
View file

@ -553,6 +553,9 @@ bool msi_create_device_irq_domain(struct device *dev, unsigned int domid,
void *chip_data);
void msi_remove_device_irq_domain(struct device *dev, unsigned int domid);
bool msi_match_device_irq_domain(struct device *dev, unsigned int domid,
enum irq_domain_bus_token bus_token);
int msi_domain_alloc_irqs_range_locked(struct device *dev, unsigned int domid,
unsigned int first, unsigned int last);
int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid,

25
kernel/irq/msi.c
View file

@ -986,6 +986,31 @@ void msi_remove_device_irq_domain(struct device *dev, unsigned int domid)
msi_unlock_descs(dev);
}
/**
* msi_match_device_irq_domain - Match a device irq domain against a bus token
* @dev: Pointer to the device
* @domid: Domain id
* @bus_token: Bus token to match against the domain bus token
*
* Return: True if device domain exists and bus tokens match.
*/
bool msi_match_device_irq_domain(struct device *dev, unsigned int domid,
enum irq_domain_bus_token bus_token)
{
struct msi_domain_info *info;
struct irq_domain *domain;
bool ret = false;
msi_lock_descs(dev);
domain = msi_get_device_domain(dev, domid);
if (domain && irq_domain_is_msi_device(domain)) {
info = domain->host_data;
ret = info->bus_token == bus_token;
}
msi_unlock_descs(dev);
return ret;
}
int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
int nvec, msi_alloc_info_t *arg)
{