genirq/msi: Move xarray into a separate struct and create an array

The upcoming support for multiple MSI domains per device requires storage
for the MSI descriptors and in a second step storage for the irqdomain
pointers.

Move the xarray into a separate data structure msi_dev_domain and create an
array with size 1 in msi_device_data, which can be expanded later when the
support for per device domains is implemented.

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/20221124230313.864887773@linutronix.de

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 9f72494..f7b9c41 100644 (file)
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -173,19 +173,28 @@ enum msi_desc_filter {
        MSI_DESC_ASSOCIATED,
 };
 
+
+/**
+ * struct msi_dev_domain - The internals of MSI domain info per device
+ * @store:             Xarray for storing MSI descriptor pointers
+ */
+struct msi_dev_domain {
+       struct xarray           store;
+};
+
 /**
  * msi_device_data - MSI per device data
  * @properties:                MSI properties which are interesting to drivers
  * @platform_data:     Platform-MSI specific data
  * @mutex:             Mutex protecting the MSI descriptor store
- * @__store:           Xarray for storing MSI descriptor pointers
+ * @__domains:         Internal data for per device MSI domains
  * @__iter_idx:                Index to search the next entry for iterators
  */
 struct msi_device_data {
        unsigned long                   properties;
        struct platform_msi_priv_data   *platform_data;
        struct mutex                    mutex;
-       struct xarray                   __store;
+       struct msi_dev_domain           __domains[MSI_MAX_DEVICE_IRQDOMAINS];
        unsigned long                   __iter_idx;
 };
 

diff --git a/include/linux/msi_api.h b/include/linux/msi_api.h
index 57d27cf..4dbbce6 100644 (file)
--- a/include/linux/msi_api.h
+++ b/include/linux/msi_api.h
@@ -10,6 +10,14 @@
 
 struct device;
 
+/*
+ * Per device interrupt domain related constants.
+ */
+enum msi_domain_ids {
+       MSI_DEFAULT_DOMAIN,
+       MSI_MAX_DEVICE_IRQDOMAINS,
+};
+
 unsigned int msi_get_virq(struct device *dev, unsigned int index);
 
 #endif

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 5939dc6..c2bc94e 100644 (file)
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -60,10 +60,11 @@ static void msi_free_desc(struct msi_desc *desc)
 
 static int msi_insert_desc(struct msi_device_data *md, struct msi_desc *desc, unsigned int index)
 {
+       struct xarray *xa = &md->__domains[MSI_DEFAULT_DOMAIN].store;
        int ret;
 
        desc->msi_index = index;
-       ret = xa_insert(&md->__store, index, desc, GFP_KERNEL);
+       ret = xa_insert(xa, index, desc, GFP_KERNEL);
        if (ret)
                msi_free_desc(desc);
        return ret;
@@ -147,7 +148,7 @@ static bool msi_desc_match(struct msi_desc *desc, enum msi_desc_filter filter)
 void msi_free_msi_descs_range(struct device *dev, unsigned int first_index,
                              unsigned int last_index)
 {
-       struct xarray *xa = &dev->msi.data->__store;
+       struct xarray *xa = &dev->msi.data->__domains[MSI_DEFAULT_DOMAIN].store;
        struct msi_desc *desc;
        unsigned long idx;
 
@@ -179,9 +180,12 @@ EXPORT_SYMBOL_GPL(get_cached_msi_msg);
 static void msi_device_data_release(struct device *dev, void *res)
 {
        struct msi_device_data *md = res;
+       int i;
 
-       WARN_ON_ONCE(!xa_empty(&md->__store));
-       xa_destroy(&md->__store);
+       for (i = 0; i < MSI_MAX_DEVICE_IRQDOMAINS; i++) {
+               WARN_ON_ONCE(!xa_empty(&md->__domains[i].store));
+               xa_destroy(&md->__domains[i].store);
+       }
        dev->msi.data = NULL;
 }
 
@@ -198,7 +202,7 @@ static void msi_device_data_release(struct device *dev, void *res)
 int msi_setup_device_data(struct device *dev)
 {
        struct msi_device_data *md;
-       int ret;
+       int ret, i;
 
        if (dev->msi.data)
                return 0;
@@ -213,7 +217,9 @@ int msi_setup_device_data(struct device *dev)
                return ret;
        }
 
-       xa_init(&md->__store);
+       for (i = 0; i < MSI_MAX_DEVICE_IRQDOMAINS; i++)
+               xa_init(&md->__domains[i].store);
+
        mutex_init(&md->mutex);
        dev->msi.data = md;
        devres_add(dev, md);
@@ -236,7 +242,7 @@ EXPORT_SYMBOL_GPL(msi_lock_descs);
  */
 void msi_unlock_descs(struct device *dev)
 {
-       /* Invalidate the index wich was cached by the iterator */
+       /* Invalidate the index which was cached by the iterator */
        dev->msi.data->__iter_idx = MSI_MAX_INDEX;
        mutex_unlock(&dev->msi.data->mutex);
 }
@@ -244,9 +250,10 @@ EXPORT_SYMBOL_GPL(msi_unlock_descs);
 
 static struct msi_desc *msi_find_desc(struct msi_device_data *md, enum msi_desc_filter filter)
 {
+       struct xarray *xa = &md->__domains[MSI_DEFAULT_DOMAIN].store;
        struct msi_desc *desc;
 
-       xa_for_each_start(&md->__store, md->__iter_idx, desc, md->__iter_idx) {
+       xa_for_each_start(xa, md->__iter_idx, desc, md->__iter_idx) {
                if (msi_desc_match(desc, filter))
                        return desc;
        }
@@ -320,6 +327,7 @@ unsigned int msi_get_virq(struct device *dev, unsigned int index)
 {
        struct msi_desc *desc;
        unsigned int ret = 0;
+       struct xarray *xa;
        bool pcimsi;
 
        if (!dev->msi.data)
@@ -328,7 +336,8 @@ unsigned int msi_get_virq(struct device *dev, unsigned int index)
        pcimsi = dev_is_pci(dev) ? to_pci_dev(dev)->msi_enabled : false;
 
        msi_lock_descs(dev);
-       desc = xa_load(&dev->msi.data->__store, pcimsi ? 0 : index);
+       xa = &dev->msi.data->__domains[MSI_DEFAULT_DOMAIN].store;
+       desc = xa_load(xa, pcimsi ? 0 : index);
        if (desc && desc->irq) {
                /*
                 * PCI-MSI has only one descriptor for multiple interrupts.
@@ -707,6 +716,7 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
        struct msi_domain_info *info = domain->host_data;
        struct msi_domain_ops *ops = info->ops;
        struct msi_desc *desc;
+       struct xarray *xa;
        int ret, virq;
 
        msi_lock_descs(dev);
@@ -714,8 +724,10 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
        if (ret)
                goto unlock;
 
+       xa = &dev->msi.data->__domains[MSI_DEFAULT_DOMAIN].store;
+
        for (virq = virq_base; virq < virq_base + nvec; virq++) {
-               desc = xa_load(&dev->msi.data->__store, virq);
+               desc = xa_load(xa, virq);
                desc->irq = virq;
 
                ops->set_desc(arg, desc);