irqdomain: Add support for generic irq chips creation before publishing a domain

The current API functions create an irq_domain and also publish this
newly created to domain. Once an irq_domain is published, consumers can
request IRQ in order to use them.

Some interrupt controller drivers have to perform some more operations
with the created irq_domain in order to have it ready to be used.
For instance:
   - Allocate generic irq chips with irq_alloc_domain_generic_chips()
   - Retrieve the generic irq chips with irq_get_domain_generic_chip()
   - Initialize retrieved chips: set register base address and offsets,
     set several hooks such as irq_mask, irq_unmask, ...

With the newly introduced irq_domain_alloc_generic_chips(), an interrupt
controller driver can use the irq_domain_chip_generic_info structure and
set the init() hook to perform its generic chips initialization.

In order to avoid a window where the domain is published but not yet
ready to be used, handle the generic chip creation (i.e the
irq_domain_alloc_generic_chips() call) before the domain is published.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240614173232.1184015-16-herve.codina@bootlin.com

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 2c927edc4d43..5540b22a755c 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -210,6 +210,9 @@ enum {
 	/* Irq domain is a MSI device domain */
 	IRQ_DOMAIN_FLAG_MSI_DEVICE	= (1 << 9),
 
+	/* Irq domain must destroy generic chips when removed */
+	IRQ_DOMAIN_FLAG_DESTROY_GC	= (1 << 10),
+
 	/*
 	 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
 	 * for implementation specific purposes and ignored by the
@@ -259,6 +262,9 @@ static inline struct fwnode_handle *irq_domain_alloc_fwnode(phys_addr_t *pa)
 }
 
 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
+
+struct irq_domain_chip_generic_info;
+
 /**
  * struct irq_domain_info - Domain information structure
  * @fwnode:		firmware node for the interrupt controller
@@ -270,6 +276,8 @@ void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
  * @bus_token:		Domain bus token
  * @ops:		Domain operation callbacks
  * @host_data:		Controller private data pointer
+ * @dgc_info:		Geneneric chip information structure pointer used to
+ *			create generic chips for the domain if not NULL.
  * @init:		Function called when the domain is created.
  *			Allow to do some additional domain initialisation.
  * @exit:		Function called when the domain is destroyed.
@@ -290,6 +298,7 @@ struct irq_domain_info {
 	 */
 	struct irq_domain			*parent;
 #endif
+	struct irq_domain_chip_generic_info	*dgc_info;
 	int					(*init)(struct irq_domain *d);
 	void					(*exit)(struct irq_domain *d);
 };