Messages in this thread Patch in this message | | | From | Diana Craciun <> | Subject | [PATCH 04/10] bus/fsl-mc: Propagate driver_override for a child DPRC's children | Date | Thu, 19 Mar 2020 17:40:45 +0200 |
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From: Bharat Bhushan <Bharat.Bhushan@nxp.com>
When a child DPRC is bound to the vfio_fsl_mc driver via driver_override, its own children should not be bound to corresponding host kernel drivers, but instead should be bound to the vfio_fsl_mc driver as well.
Currently, when a child container is scanned by the vfio_fsl_mc driver, child devices found are automatically bound to corresponding host kernel drivers (e.g., DPMCP and DPBP objects are bound to the fsl_mc_allocator driver, DPNI objects are bound to the ldpaa_eth driver, etc), Then, the user has to manually unbind these child devices from their drivers, set the driver_override sysfs attribute to vfio_fsl_mc driver, for each of them and rebind them.
Signed-off-by: J. German Rivera <German.Rivera@freescale.com> Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> Signed-off-by: Diana Craciun <diana.craciun@oss.nxp.com> --- drivers/bus/fsl-mc/dprc-driver.c | 12 ++++++++---- drivers/bus/fsl-mc/fsl-mc-bus.c | 18 +++++++++++++++++- drivers/bus/fsl-mc/fsl-mc-private.h | 2 ++ include/linux/fsl/mc.h | 2 ++ 4 files changed, 29 insertions(+), 5 deletions(-)
diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c index d373b28abe2d..7eaf78900dfc 100644 --- a/drivers/bus/fsl-mc/dprc-driver.c +++ b/drivers/bus/fsl-mc/dprc-driver.c @@ -155,6 +155,8 @@ static void check_plugged_state_change(struct fsl_mc_device *mc_dev, * dprc_add_new_devices - Adds devices to the logical bus for a DPRC * * @mc_bus_dev: pointer to the fsl-mc device that represents a DPRC object + * @driver_override: driver override to apply to new objects found in the + * DPRC, or NULL, if none. * @obj_desc_array: array of device descriptors for child devices currently * present in the physical DPRC. * @num_child_objects_in_mc: number of entries in obj_desc_array @@ -164,6 +166,7 @@ static void check_plugged_state_change(struct fsl_mc_device *mc_dev, * in the physical DPRC. */ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev, + const char *driver_override, struct fsl_mc_obj_desc *obj_desc_array, int num_child_objects_in_mc) { @@ -188,7 +191,7 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev, } error = fsl_mc_device_add(obj_desc, NULL, &mc_bus_dev->dev, - &child_dev); + driver_override, &child_dev); if (error < 0) continue; } @@ -214,6 +217,7 @@ static void dprc_add_new_devices(struct fsl_mc_device *mc_bus_dev, * of the device drivers for the non-allocatable devices. */ static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, + const char *driver_override, bool alloc_interrupts) { int num_child_objects; @@ -313,7 +317,7 @@ static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev, dprc_remove_devices(mc_bus_dev, child_obj_desc_array, num_child_objects); - dprc_add_new_devices(mc_bus_dev, child_obj_desc_array, + dprc_add_new_devices(mc_bus_dev, driver_override, child_obj_desc_array, num_child_objects); if (child_obj_desc_array) @@ -342,7 +346,7 @@ 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, true); + error = dprc_scan_objects(mc_bus_dev, NULL, true); mutex_unlock(&mc_bus->scan_mutex); if (error < 0) { fsl_mc_cleanup_all_resource_pools(mc_bus_dev); @@ -412,7 +416,7 @@ 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, true); + error = dprc_scan_objects(mc_dev, NULL, true); if (error < 0) { /* * If the error is -ENXIO, we ignore it, as it indicates diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c index baf8259262a9..b9ccac9862b7 100644 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c @@ -617,6 +617,7 @@ static void fsl_mc_device_release(struct device *dev) int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc, struct fsl_mc_io *mc_io, struct device *parent_dev, + const char *driver_override, struct fsl_mc_device **new_mc_dev) { int error; @@ -649,6 +650,19 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc, mc_dev->obj_desc = *obj_desc; mc_dev->mc_io = mc_io; + + if (driver_override) { + /* + * We trust driver_override, so we don't need to use + * kstrndup() here + */ + mc_dev->driver_override = kstrdup(driver_override, GFP_KERNEL); + if (!mc_dev->driver_override) { + error = -ENOMEM; + goto error_cleanup_dev; + } + } + device_initialize(&mc_dev->dev); mc_dev->dev.parent = parent_dev; mc_dev->dev.bus = &fsl_mc_bus_type; @@ -740,6 +754,7 @@ int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc, error_cleanup_dev: kfree(mc_dev->regions); + kfree(mc_dev->driver_override); kfree(mc_bus); kfree(mc_dev); @@ -980,7 +995,8 @@ static int fsl_mc_bus_probe(struct platform_device *pdev) obj_desc.irq_count = 1; obj_desc.region_count = 0; - error = fsl_mc_device_add(&obj_desc, mc_io, &pdev->dev, &mc_bus_dev); + error = fsl_mc_device_add(&obj_desc, mc_io, &pdev->dev, NULL, + &mc_bus_dev); if (error < 0) goto error_cleanup_mc_io; diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h index 21ca8c756ee7..be6bb0fb4603 100644 --- a/drivers/bus/fsl-mc/fsl-mc-private.h +++ b/drivers/bus/fsl-mc/fsl-mc-private.h @@ -3,6 +3,7 @@ * Freescale Management Complex (MC) bus private declarations * * Copyright (C) 2016 Freescale Semiconductor, Inc. + * Copyright 2019-2020 NXP * */ #ifndef _FSL_MC_PRIVATE_H_ @@ -567,6 +568,7 @@ struct fsl_mc_bus { int __must_check fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc, struct fsl_mc_io *mc_io, struct device *parent_dev, + const char *driver_override, struct fsl_mc_device **new_mc_dev); void fsl_mc_device_remove(struct fsl_mc_device *mc_dev); diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h index 88095fd30c80..f997f8091408 100644 --- a/include/linux/fsl/mc.h +++ b/include/linux/fsl/mc.h @@ -3,6 +3,7 @@ * Freescale Management Complex (MC) bus public interface * * Copyright (C) 2014-2016 Freescale Semiconductor, Inc. + * Copyright 2019-2020 NXP * Author: German Rivera <German.Rivera@freescale.com> * */ @@ -161,6 +162,7 @@ struct fsl_mc_obj_desc { * @regions: pointer to array of MMIO region entries * @irqs: pointer to array of pointers to interrupts allocated to this device * @resource: generic resource associated with this MC object device, if any. + * @driver_override: Driver name to force a match * * Generic device object for MC object devices that are "attached" to a * MC bus. -- 2.17.1
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