genirq/msi: Provide msi_desc:: Msi_data

The upcoming support for PCI/IMS requires to store some information related
to the message handling in the MSI descriptor, e.g. PASID or a pointer to a
queue.

Provide a generic storage struct which maps over the existing PCI specific
storage which means the size of struct msi_desc is not getting bigger.

This storage struct has two elements:

  1) msi_domain_cookie
  2) msi_instance_cookie

The domain cookie is going to be used to store domain specific information,
e.g. iobase pointer, data pointer.

The instance cookie is going to be handed in when allocating an interrupt
on an IMS domain so the irq chip callbacks of the IMS domain have the
necessary per vector information available. It also comes in handy when
cleaning up the platform MSI code for wire to MSI bridges which need to
hand down the type information to the underlying interrupt domain.

For the core code the cookies are opaque and meaningless. It just stores
the instance cookie during an allocation through the upcoming interfaces
for IMS and wire to MSI brigdes.

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/20221124232326.385036043@linutronix.de

diff --git a/include/linux/msi.h b/include/linux/msi.h
index b5dda4bf4156017a19eed746bb25932fa0676ff1..dca3b801428f9b8a7d76a077f2f637fa7f5a447e 100644 (file)
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -125,6 +125,38 @@ struct pci_msi_desc {
        };
 };
 
+/**
+ * union msi_domain_cookie - Opaque MSI domain specific data
+ * @value:     u64 value store
+ * @ptr:       Pointer to domain specific data
+ * @iobase:    Domain specific IOmem pointer
+ *
+ * The content of this data is implementation defined and used by the MSI
+ * domain to store domain specific information which is requried for
+ * interrupt chip callbacks.
+ */
+union msi_domain_cookie {
+       u64     value;
+       void    *ptr;
+       void    __iomem *iobase;
+};
+
+/**
+ * struct msi_desc_data - Generic MSI descriptor data
+ * @dcookie:   Cookie for MSI domain specific data which is required
+ *             for irq_chip callbacks
+ * @icookie:   Cookie for the MSI interrupt instance provided by
+ *             the usage site to the allocation function
+ *
+ * The content of this data is implementation defined, e.g. PCI/IMS
+ * implementations define the meaning of the data. The MSI core ignores
+ * this data completely.
+ */
+struct msi_desc_data {
+       union msi_domain_cookie         dcookie;
+       union msi_instance_cookie       icookie;
+};
+
 #define MSI_MAX_INDEX          ((unsigned int)USHRT_MAX)
 
 /**
@@ -142,6 +174,7 @@ struct pci_msi_desc {
  *
  * @msi_index: Index of the msi descriptor
  * @pci:       PCI specific msi descriptor data
+ * @data:      Generic MSI descriptor data
  */
 struct msi_desc {
        /* Shared device/bus type independent data */
@@ -161,7 +194,10 @@ struct msi_desc {
        void *write_msi_msg_data;
 
        u16                             msi_index;
-       struct pci_msi_desc             pci;
+       union {
+               struct pci_msi_desc     pci;
+               struct msi_desc_data    data;
+       };
 };
 
 /*

diff --git a/include/linux/msi_api.h b/include/linux/msi_api.h
index 4cb7f4c9a3aed0c6bc7d3eae7a0a33035819e62b..2e4456ec9f6bc4650a4b06b84d0853c8bb48d572 100644 (file)
--- a/include/linux/msi_api.h
+++ b/include/linux/msi_api.h
@@ -18,6 +18,23 @@ enum msi_domain_ids {
        MSI_MAX_DEVICE_IRQDOMAINS,
 };
 
+/**
+ * union msi_instance_cookie - MSI instance cookie
+ * @value:     u64 value store
+ * @ptr:       Pointer to usage site specific data
+ *
+ * This cookie is handed to the IMS allocation function and stored in the
+ * MSI descriptor for the interrupt chip callbacks.
+ *
+ * The content of this cookie is MSI domain implementation defined.  For
+ * PCI/IMS implementations this could be a PASID or a pointer to queue
+ * memory.
+ */
+union msi_instance_cookie {
+       u64     value;
+       void    *ptr;
+};
+
 /**
  * msi_map - Mapping between MSI index and Linux interrupt number
  * @index:     The MSI index, e.g. slot in the MSI-X table or