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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-11-25 00:25:57 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-12-05 19:21:01 +0100 |
| commit | 26e91b75bf6108550035355c835bf0c93c885b61 (patch) | |
| tree | d79e3001c870060f7679e9ef08213e53f9fe3e77 | |
| parent | 27a6dea3ebaab3d6f8ded969ec3af710bcbe0c02 (diff) | |
| download | linux-26e91b75bf6108550035355c835bf0c93c885b61.tar.gz linux-26e91b75bf6108550035355c835bf0c93c885b61.tar.bz2 linux-26e91b75bf6108550035355c835bf0c93c885b61.zip | |
genirq/msi: Provide msi_match_device_domain()
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
| -rw-r--r-- | include/linux/msi.h | 3 | ||||
| -rw-r--r-- | kernel/irq/msi.c | 25 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h index ef46a3ee18e4..b4ab00562a29 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -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, diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 8b415bdb0425..74499980cfc2 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -986,6 +986,31 @@ unlock: 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) { |