The IRQ pool handling functions can be used by both DPRC
driver and VFIO. Adapt and export those functions.

Signed-off-by: Diana Craciun <diana.crac...@oss.nxp.com>
---
 drivers/bus/fsl-mc/dprc-driver.c      |  7 +++----
 drivers/bus/fsl-mc/fsl-mc-allocator.c | 12 ++++++++----
 drivers/bus/fsl-mc/fsl-mc-private.h   | 10 ----------
 include/linux/fsl/mc.h                | 11 +++++++++++
 4 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 471386e9b46c..3521515a4ac2 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -327,8 +327,8 @@ static int dprc_scan_objects(struct fsl_mc_device 
*mc_bus_dev,
                }
 
                if (alloc_interrupts && !mc_bus->irq_resources) {
-                       error = fsl_mc_populate_irq_pool(mc_bus,
-                               FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+                       error = fsl_mc_populate_irq_pool(mc_bus_dev,
+                                        FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
                        if (error < 0)
                                return error;
                }
@@ -766,7 +766,6 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
 int dprc_cleanup(struct fsl_mc_device *mc_dev)
 {
        int error;
-       struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
 
        if (!is_fsl_mc_bus_dprc(mc_dev))
                return -EINVAL;
@@ -775,7 +774,7 @@ int dprc_cleanup(struct fsl_mc_device *mc_dev)
                return -EINVAL;
 
        if (dev_get_msi_domain(&mc_dev->dev)) {
-               fsl_mc_cleanup_irq_pool(mc_bus);
+               fsl_mc_cleanup_irq_pool(mc_dev);
                dev_set_msi_domain(&mc_dev->dev, NULL);
        }
 
diff --git a/drivers/bus/fsl-mc/fsl-mc-allocator.c 
b/drivers/bus/fsl-mc/fsl-mc-allocator.c
index cc7bb900f524..e71a6f52ea0c 100644
--- a/drivers/bus/fsl-mc/fsl-mc-allocator.c
+++ b/drivers/bus/fsl-mc/fsl-mc-allocator.c
@@ -344,7 +344,7 @@ EXPORT_SYMBOL_GPL(fsl_mc_object_free);
  * Initialize the interrupt pool associated with an fsl-mc bus.
  * It allocates a block of IRQs from the GIC-ITS.
  */
-int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
+int fsl_mc_populate_irq_pool(struct fsl_mc_device *mc_bus_dev,
                             unsigned int irq_count)
 {
        unsigned int i;
@@ -352,10 +352,14 @@ int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
        struct fsl_mc_device_irq *irq_resources;
        struct fsl_mc_device_irq *mc_dev_irq;
        int error;
-       struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
+       struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
        struct fsl_mc_resource_pool *res_pool =
                        &mc_bus->resource_pools[FSL_MC_POOL_IRQ];
 
+       /* do nothing if the IRQ pool is already populated */
+       if (mc_bus->irq_resources)
+               return 0;
+
        if (irq_count == 0 ||
            irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS)
                return -EINVAL;
@@ -407,9 +411,9 @@ EXPORT_SYMBOL_GPL(fsl_mc_populate_irq_pool);
  * Teardown the interrupt pool associated with an fsl-mc bus.
  * It frees the IRQs that were allocated to the pool, back to the GIC-ITS.
  */
-void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus)
+void fsl_mc_cleanup_irq_pool(struct fsl_mc_device *mc_bus_dev)
 {
-       struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev;
+       struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev);
        struct fsl_mc_resource_pool *res_pool =
                        &mc_bus->resource_pools[FSL_MC_POOL_IRQ];
 
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h 
b/drivers/bus/fsl-mc/fsl-mc-private.h
index 5f7e762d517c..ffe709a3f0f8 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -519,11 +519,6 @@ struct dpcon_cmd_set_notification {
        __le64 user_ctx;
 };
 
-/**
- * Maximum number of total IRQs that can be pre-allocated for an MC bus'
- * IRQ pool
- */
-#define FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS 256
 
 /**
  * struct fsl_mc_resource_pool - Pool of MC resources of a given
@@ -598,11 +593,6 @@ void fsl_mc_msi_domain_free_irqs(struct device *dev);
 
 struct irq_domain *fsl_mc_find_msi_domain(struct device *dev);
 
-int fsl_mc_populate_irq_pool(struct fsl_mc_bus *mc_bus,
-                            unsigned int irq_count);
-
-void fsl_mc_cleanup_irq_pool(struct fsl_mc_bus *mc_bus);
-
 int __must_check fsl_create_mc_io(struct device *dev,
                                  phys_addr_t mc_portal_phys_addr,
                                  u32 mc_portal_size,
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index e99d181ee4cd..f791fe38c251 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -542,6 +542,17 @@ int dprc_cleanup(struct fsl_mc_device *mc_dev);
 
 int dprc_setup(struct fsl_mc_device *mc_dev);
 
+/**
+ * Maximum number of total IRQs that can be pre-allocated for an MC bus'
+ * IRQ pool
+ */
+#define FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS 256
+
+int fsl_mc_populate_irq_pool(struct fsl_mc_device *mc_bus_dev,
+                            unsigned int irq_count);
+
+void fsl_mc_cleanup_irq_pool(struct fsl_mc_device *mc_bus_dev);
+
 /*
  * Data Path Buffer Pool (DPBP) API
  * Contains initialization APIs and runtime control APIs for DPBP
-- 
2.17.1

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