bus: fsl-mc-msi: Simplify MSI descriptor handling

Let the MSI irq domain code handle descriptor allocation and free.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210748.847219474@linutronix.de

diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
index 4823947..5e0e439 100644 (file)
--- a/drivers/bus/fsl-mc/fsl-mc-msi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
@@ -170,6 +170,7 @@ struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
                fsl_mc_msi_update_dom_ops(info);
        if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
                fsl_mc_msi_update_chip_ops(info);
+       info->flags |= MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
 
        domain = msi_create_irq_domain(fwnode, info, parent);
        if (domain)
@@ -210,45 +211,7 @@ struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
        return msi_domain;
 }
 
-static void fsl_mc_msi_free_descs(struct device *dev)
-{
-       struct msi_desc *desc, *tmp;
-
-       list_for_each_entry_safe(desc, tmp, dev_to_msi_list(dev), list) {
-               list_del(&desc->list);
-               free_msi_entry(desc);
-       }
-}
-
-static int fsl_mc_msi_alloc_descs(struct device *dev, unsigned int irq_count)
-
-{
-       unsigned int i;
-       int error;
-       struct msi_desc *msi_desc;
-
-       for (i = 0; i < irq_count; i++) {
-               msi_desc = alloc_msi_entry(dev, 1, NULL);
-               if (!msi_desc) {
-                       dev_err(dev, "Failed to allocate msi entry\n");
-                       error = -ENOMEM;
-                       goto cleanup_msi_descs;
-               }
-
-               msi_desc->msi_index = i;
-               INIT_LIST_HEAD(&msi_desc->list);
-               list_add_tail(&msi_desc->list, dev_to_msi_list(dev));
-       }
-
-       return 0;
-
-cleanup_msi_descs:
-       fsl_mc_msi_free_descs(dev);
-       return error;
-}
-
-int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
-                                unsigned int irq_count)
+int fsl_mc_msi_domain_alloc_irqs(struct device *dev,  unsigned int irq_count)
 {
        struct irq_domain *msi_domain;
        int error;
@@ -261,28 +224,17 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
        if (error)
                return error;
 
-       if (!list_empty(dev_to_msi_list(dev)))
+       if (msi_first_desc(dev, MSI_DESC_ALL))
                return -EINVAL;
 
-       error = fsl_mc_msi_alloc_descs(dev, irq_count);
-       if (error < 0)
-               return error;
-
        /*
         * NOTE: Calling this function will trigger the invocation of the
         * its_fsl_mc_msi_prepare() callback
         */
        error = msi_domain_alloc_irqs(msi_domain, dev, irq_count);
 
-       if (error) {
+       if (error)
                dev_err(dev, "Failed to allocate IRQs\n");
-               goto cleanup_msi_descs;
-       }
-
-       return 0;
-
-cleanup_msi_descs:
-       fsl_mc_msi_free_descs(dev);
        return error;
 }
 
@@ -295,9 +247,4 @@ void fsl_mc_msi_domain_free_irqs(struct device *dev)
                return;
 
        msi_domain_free_irqs(msi_domain, dev);
-
-       if (list_empty(dev_to_msi_list(dev)))
-               return;
-
-       fsl_mc_msi_free_descs(dev);
 }