From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 14 Jan 2021 19:07:51 +0200
Subject: bus: fsl-mc: add bus rescan attribute
Git-commit: 3f6099438181d269d56f9d4040d93ffae65f9e4c
Patch-mainline: v5.12-rc1
References: jsc#SLE-12251
Introduce the rescan attribute as a bus attribute to
synchronize the fsl-mc bus objects and the MC firmware.
To rescan the fsl-mc bus, e.g.,
echo 1 > /sys/bus/fsl-mc/rescan
Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-5-ciorneiioana@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
---
Documentation/ABI/stable/sysfs-bus-fsl-mc | 9 ++++++
MAINTAINERS | 1
drivers/bus/fsl-mc/dprc-driver.c | 4 +-
drivers/bus/fsl-mc/fsl-mc-bus.c | 41 ++++++++++++++++++++++++++++++
drivers/bus/fsl-mc/fsl-mc-private.h | 3 ++
5 files changed, 56 insertions(+), 2 deletions(-)
create mode 100644 Documentation/ABI/stable/sysfs-bus-fsl-mc
--- /dev/null
+++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
@@ -0,0 +1,9 @@
+What: /sys/bus/fsl-mc/rescan
+Date: January 2021
+KernelVersion: 5.12
+Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
+Description: Writing a non-zero value to this attribute will
+ force a rescan of fsl-mc bus in the system and
+ synchronize the objects under fsl-mc bus and the
+ Management Complex firmware.
+Users: Userspace drivers and management tools
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13373,6 +13373,7 @@ M: Stuart Yoder <stuyoder@gmail.com>
M: Laurentiu Tudor <laurentiu.tudor@nxp.com>
L: linux-kernel@vger.kernel.org
S: Maintained
+F: Documentation/ABI/stable/sysfs-bus-fsl-mc
F: drivers/bus/fsl-mc/
F: Documentation/devicetree/bindings/misc/fsl,qoriq-mc.txt
F: Documentation/networking/device_drivers/freescale/dpaa2/overview.rst
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -237,8 +237,8 @@ static void dprc_add_new_devices(struct
* 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,
- bool alloc_interrupts)
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+ bool alloc_interrupts)
{
int num_child_objects;
int dprc_get_obj_failures;
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -208,12 +208,53 @@ static struct attribute *fsl_mc_dev_attr
ATTRIBUTE_GROUPS(fsl_mc_dev);
+static int scan_fsl_mc_bus(struct device *dev, void *data)
+{
+ struct fsl_mc_device *root_mc_dev;
+ struct fsl_mc_bus *root_mc_bus;
+
+ if (!fsl_mc_is_root_dprc(dev))
+ goto exit;
+
+ root_mc_dev = to_fsl_mc_device(dev);
+ root_mc_bus = to_fsl_mc_bus(root_mc_dev);
+ mutex_lock(&root_mc_bus->scan_mutex);
+ dprc_scan_objects(root_mc_dev, NULL);
+ mutex_unlock(&root_mc_bus->scan_mutex);
+
+exit:
+ return 0;
+}
+
+static ssize_t rescan_store(struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (val)
+ bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
+
+ return count;
+}
+static BUS_ATTR_WO(rescan);
+
+static struct attribute *fsl_mc_bus_attrs[] = {
+ &bus_attr_rescan.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(fsl_mc_bus);
+
struct bus_type fsl_mc_bus_type = {
.name = "fsl-mc",
.match = fsl_mc_bus_match,
.uevent = fsl_mc_bus_uevent,
.dma_configure = fsl_mc_dma_configure,
.dev_groups = fsl_mc_dev_groups,
+ .bus_groups = fsl_mc_bus_groups,
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -594,6 +594,9 @@ int __init dprc_driver_init(void);
void dprc_driver_exit(void);
+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
+ bool alloc_interrupts);
+
int __init fsl_mc_allocator_driver_init(void);
void fsl_mc_allocator_driver_exit(void);