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authorThomas Gleixner <tglx@linutronix.de>2022-11-25 00:25:57 +0100
committerThomas Gleixner <tglx@linutronix.de>2022-12-05 19:21:01 +0100
commit26e91b75bf6108550035355c835bf0c93c885b61 (patch)
treed79e3001c870060f7679e9ef08213e53f9fe3e77 /kernel/irq
parent27a6dea3ebaab3d6f8ded969ec3af710bcbe0c02 (diff)
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
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/msi.c25
1 files changed, 25 insertions, 0 deletions
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)
{