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101 lines
2.9 KiB
Diff
101 lines
2.9 KiB
Diff
From 64bd4f6f266110d908e51787a81ed0bc9d325941 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 18:37:32 +0200
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Subject: [PATCH] bus: fsl-mc: add root dprc rescan attribute
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Introduce the rescan attribute as a device attribute to
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synchronize the fsl-mc bus objects and the MC firmware.
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To rescan the root dprc only, e.g.
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echo 1 > /sys/bus/fsl-mc/devices/dprc.1/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 | 9 ++++++++
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MAINTAINERS | 1 +
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drivers/bus/fsl-mc/dprc-driver.c | 36 +++++++++++++++++++++++++++++++
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3 files changed, 46 insertions(+)
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create mode 100644 Documentation/ABI/stable/sysfs-bus-fsl-mc
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--- /dev/null
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+++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
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@@ -0,0 +1,9 @@
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+What: /sys/bus/fsl-mc/devices/dprc.*/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 dprc.X container in the system and
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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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--- a/MAINTAINERS
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+++ b/MAINTAINERS
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@@ -13440,6 +13440,7 @@ F: Documentation/devicetree/bindings/mis
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F: Documentation/networking/device_drivers/freescale/dpaa2/overview.rst
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F: Documentation/networking/dpaa2/overview.rst
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F: include/uapi/linux/fsl_mc.h
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+F: Documentation/ABI/stable/sysfs-bus-fsl-mc
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QT1010 MEDIA DRIVER
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M: Antti Palosaari <crope@iki.fi>
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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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@@ -354,6 +354,33 @@ static int dprc_scan_container(struct fs
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return 0;
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}
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+static ssize_t rescan_store(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t count)
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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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+ unsigned long val;
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+
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+ if (!fsl_mc_is_root_dprc(dev))
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+ return -EINVAL;
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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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+
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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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+ 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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+
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+ return count;
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+}
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+static DEVICE_ATTR_WO(rescan);
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+
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/**
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* dprc_irq0_handler - Regular ISR for DPRC interrupt 0
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*
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@@ -692,6 +719,13 @@ static int dprc_probe(struct fsl_mc_devi
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mutex_init(&mc_bus->scan_mutex);
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+ error = device_create_file(&mc_dev->dev, &dev_attr_rescan);
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+ if (error < 0) {
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+ dev_err(&mc_dev->dev, "device_create_file() failed: %d\n",
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+ error);
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+ goto error_cleanup_open;
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+ }
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+
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/*
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* Discover MC objects in DPRC object:
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*/
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@@ -788,6 +822,8 @@ static int dprc_remove(struct fsl_mc_dev
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fsl_mc_uapi_remove_device_file(mc_bus);
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}
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+ device_remove_file(&mc_dev->dev, &dev_attr_rescan);
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+
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dev_info(&mc_dev->dev, "DPRC device unbound from driver");
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return 0;
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}
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