linux-kernel - [PATCH 02/10] bus/fsl-mc: Add a new parameter to dprc_scan

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Date:   Thu, 19 Mar 2020 17:40:43 +0200
From:   Diana Craciun <diana.craciun@....nxp.com>
To:     linux-kernel@...r.kernel.org, laurentiu.tudor@....com,
        stuyoder@...il.com, leoyang.li@....com,
        linux-arm-kernel@...ts.infradead.org, bharatb.yadav@...il.com
Cc:     Diana Craciun <diana.craciun@....nxp.com>
Subject: [PATCH 02/10] bus/fsl-mc: Add a new parameter to dprc_scan_objects function

Prepare the dprc_scan_objects function to be used by
the VFIO mc driver code. The function is used to scan the mc
objects by the bus driver. The same functionality is
needed by the VFIO mc driver, but in this case the
interrupt configuration is delayed until the userspace
configures the interrupts. In order to use the same function
in both drivers add a new parameter.

Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
---
 drivers/bus/fsl-mc/dprc-driver.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 035b220779d0..d373b28abe2d 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -198,7 +198,9 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
  * dprc_scan_objects - Discover objects in a DPRC
  *
  * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object
- *
+ * @alloc_interrupts: if true the function allocates the interrupt pool,
+ * otherwise the interrupt allocation is delayed
+
  * Detects objects added and removed from a DPRC and synchronizes the
  * state of the Linux bus driver, MC by adding and removing
  * devices accordingly.
@@ -211,7 +213,8 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev,
  * populated before they can get allocation requests from probe callbacks
  * of the device drivers for the non-allocatable devices.
  */
-static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
+static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+			    bool alloc_interrupts)
 {
 	int num_child_objects;
 	int dprc_get_obj_failures;
@@ -299,7 +302,7 @@ static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev)
 				 irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
 		}
 
-		if (!mc_bus->irq_resources) {
+		if (alloc_interrupts && !mc_bus->irq_resources) {
 			error = fsl_mc_populate_irq_pool(mc_bus,
 				FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
 			if (error < 0)
@@ -339,7 +342,7 @@ static int dprc_scan_container(struct fsl_mc_device *mc_bus_dev)
 	 * Discover objects in the DPRC:
 	 */
 	mutex_lock(&mc_bus->scan_mutex);
-	error = dprc_scan_objects(mc_bus_dev);
+	error = dprc_scan_objects(mc_bus_dev, true);
 	mutex_unlock(&mc_bus->scan_mutex);
 	if (error < 0) {
 		fsl_mc_cleanup_all_resource_pools(mc_bus_dev);
@@ -409,7 +412,7 @@ static irqreturn_t dprc_irq0_handler_thread(int irq_num, void *arg)
 		      DPRC_IRQ_EVENT_OBJ_DESTROYED |
 		      DPRC_IRQ_EVENT_OBJ_CREATED)) {
 
-		error = dprc_scan_objects(mc_dev);
+		error = dprc_scan_objects(mc_dev, true);
 		if (error < 0) {
 			/*
 			 * If the error is -ENXIO, we ignore it, as it indicates
-- 
2.17.1