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116 lines
3.5 KiB
Diff
116 lines
3.5 KiB
Diff
From 4eba1e0209a52798e1b6a233840a28fc5132cd9c Mon Sep 17 00:00:00 2001
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From: Ioana Ciornei <ioana.ciornei@nxp.com>
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Date: Mon, 5 Mar 2018 18:38:46 +0200
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Subject: [PATCH] bus: fsl-mc: add bus rescan attribute
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Introduce the rescan attribute as a bus attribute to
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synchronize the fsl-mc bus objects and the MC firmware.
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To rescan the fsl-mc bus, e.g.,
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echo 1 > /sys/bus/fsl-mc/rescan
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Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
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---
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Documentation/ABI/stable/sysfs-bus-fsl-mc | 10 ++++++++
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drivers/bus/fsl-mc/dprc-driver.c | 4 +--
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drivers/bus/fsl-mc/fsl-mc-bus.c | 41 +++++++++++++++++++++++++++++++
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drivers/bus/fsl-mc/fsl-mc-private.h | 2 ++
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4 files changed, 55 insertions(+), 2 deletions(-)
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--- a/Documentation/ABI/stable/sysfs-bus-fsl-mc
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+++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
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@@ -7,3 +7,13 @@ Description: Writing a non-zero value to
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synchronize the objects under dprc.X and the
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Management Complex firmware.
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Users: Userspace drivers and management tools
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+
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+What: /sys/bus/fsl-mc/rescan
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+Date: November 2018
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+KernelVersion: 5.0
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+Contact: Ioana Ciornei <ioana.ciornei@nxp.com>
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+Description: Writing a non-zero value to this attribute will
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+ force a rescan of fsl-mc bus in the system and
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+ synchronize the objects under fsl-mc bus and the
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+ Management Complex firmware.
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+Users: Userspace drivers and management tools
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--- a/drivers/bus/fsl-mc/dprc-driver.c
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+++ b/drivers/bus/fsl-mc/dprc-driver.c
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@@ -214,8 +214,8 @@ static void dprc_add_new_devices(struct
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* populated before they can get allocation requests from probe callbacks
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* of the device drivers for the non-allocatable devices.
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*/
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-static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
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- unsigned int *total_irq_count)
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+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
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+ unsigned int *total_irq_count)
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{
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int num_child_objects;
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int dprc_get_obj_failures;
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--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
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+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
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@@ -154,12 +154,53 @@ static struct attribute *fsl_mc_dev_attr
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ATTRIBUTE_GROUPS(fsl_mc_dev);
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+static int scan_fsl_mc_bus(struct device *dev, void *data)
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+{
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+ struct fsl_mc_device *root_mc_dev;
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+ struct fsl_mc_bus *root_mc_bus;
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+
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+ if (!fsl_mc_is_root_dprc(dev))
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+ goto exit;
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+
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+ root_mc_dev = to_fsl_mc_device(dev);
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+ root_mc_bus = to_fsl_mc_bus(root_mc_dev);
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+ mutex_lock(&root_mc_bus->scan_mutex);
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+ dprc_scan_objects(root_mc_dev, NULL);
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+ mutex_unlock(&root_mc_bus->scan_mutex);
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+
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+exit:
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+ return 0;
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+}
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+
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+static ssize_t rescan_store(struct bus_type *bus,
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+ const char *buf, size_t count)
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+{
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+ unsigned long val;
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+
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+ if (kstrtoul(buf, 0, &val) < 0)
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+ return -EINVAL;
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+
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+ if (val)
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+ bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
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+
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+ return count;
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+}
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+static BUS_ATTR_WO(rescan);
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+
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+static struct attribute *fsl_mc_bus_attrs[] = {
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+ &bus_attr_rescan.attr,
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+ NULL,
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+};
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+
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+ATTRIBUTE_GROUPS(fsl_mc_bus);
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+
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struct bus_type fsl_mc_bus_type = {
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.name = "fsl-mc",
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.match = fsl_mc_bus_match,
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.uevent = fsl_mc_bus_uevent,
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.dma_configure = fsl_mc_dma_configure,
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.dev_groups = fsl_mc_dev_groups,
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+ .bus_groups = fsl_mc_bus_groups,
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};
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EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
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--- a/drivers/bus/fsl-mc/fsl-mc-private.h
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+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
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@@ -556,6 +556,8 @@ int __init dprc_driver_init(void);
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void dprc_driver_exit(void);
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+int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
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+ unsigned int *total_irq_count);
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int __init fsl_mc_allocator_driver_init(void);
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void fsl_mc_allocator_driver_exit(void);
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