target/linux/layerscape/patches-5.4/701-net-0132-bus-fsl-mc-add-root-dprc-rescan-attribute.patch

   1 From 64bd4f6f266110d908e51787a81ed0bc9d325941 Mon Sep 17 00:00:00 2001
   2 From: Ioana Ciornei <ioana.ciornei@nxp.com>
   3 Date: Mon, 5 Mar 2018 18:37:32 +0200
   4 Subject: [PATCH] bus: fsl-mc: add root dprc rescan attribute
   5
   6 Introduce the rescan attribute as a device attribute to
   7 synchronize the fsl-mc bus objects and the MC firmware.
   8
   9 To rescan the root dprc only, e.g.
  10 echo 1 > /sys/bus/fsl-mc/devices/dprc.1/rescan
  11
  12 Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
  13 ---
  14  Documentation/ABI/stable/sysfs-bus-fsl-mc |  9 ++++++++
  15  MAINTAINERS                               |  1 +
  16  drivers/bus/fsl-mc/dprc-driver.c          | 36 +++++++++++++++++++++++++++++++
  17  3 files changed, 46 insertions(+)
  18  create mode 100644 Documentation/ABI/stable/sysfs-bus-fsl-mc
  19
  20 --- /dev/null
  21 +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
  22 @@ -0,0 +1,9 @@
  23 +What:          /sys/bus/fsl-mc/devices/dprc.*/rescan
  24 +Date:          November 2018
  25 +KernelVersion: 5.0
  26 +Contact:       Ioana Ciornei <ioana.ciornei@nxp.com>
  27 +Description:   Writing a non-zero value to this attribute will
  28 +               force a rescan of dprc.X container in the system and
  29 +               synchronize the objects under dprc.X and the
  30 +               Management Complex firmware.
  31 +Users:         Userspace drivers and management tools
  32 --- a/MAINTAINERS
  33 +++ b/MAINTAINERS
  34 @@ -13438,6 +13438,7 @@ F:      Documentation/devicetree/bindings/mis
  35  F:     Documentation/networking/device_drivers/freescale/dpaa2/overview.rst
  36  F:     Documentation/networking/dpaa2/overview.rst
  37  F:     include/uapi/linux/fsl_mc.h
  38 +F:     Documentation/ABI/stable/sysfs-bus-fsl-mc
  39
  40  QT1010 MEDIA DRIVER
  41  M:     Antti Palosaari <crope@iki.fi>
  42 --- a/drivers/bus/fsl-mc/dprc-driver.c
  43 +++ b/drivers/bus/fsl-mc/dprc-driver.c
  44 @@ -354,6 +354,33 @@ static int dprc_scan_container(struct fs
  45         return 0;
  46  }
  47
  48 +static ssize_t rescan_store(struct device *dev,
  49 +                           struct device_attribute *attr,
  50 +                           const char *buf, size_t count)
  51 +{
  52 +       struct fsl_mc_device *root_mc_dev;
  53 +       struct fsl_mc_bus *root_mc_bus;
  54 +       unsigned long val;
  55 +
  56 +       if (!fsl_mc_is_root_dprc(dev))
  57 +               return -EINVAL;
  58 +
  59 +       root_mc_dev = to_fsl_mc_device(dev);
  60 +       root_mc_bus = to_fsl_mc_bus(root_mc_dev);
  61 +
  62 +       if (kstrtoul(buf, 0, &val) < 0)
  63 +               return -EINVAL;
  64 +
  65 +       if (val) {
  66 +               mutex_lock(&root_mc_bus->scan_mutex);
  67 +               dprc_scan_objects(root_mc_dev, NULL);
  68 +               mutex_unlock(&root_mc_bus->scan_mutex);
  69 +       }
  70 +
  71 +       return count;
  72 +}
  73 +static DEVICE_ATTR_WO(rescan);
  74 +
  75  /**
  76   * dprc_irq0_handler - Regular ISR for DPRC interrupt 0
  77   *
  78 @@ -692,6 +719,13 @@ static int dprc_probe(struct fsl_mc_devi
  79
  80         mutex_init(&mc_bus->scan_mutex);
  81
  82 +       error = device_create_file(&mc_dev->dev, &dev_attr_rescan);
  83 +       if (error < 0) {
  84 +               dev_err(&mc_dev->dev, "device_create_file() failed: %d\n",
  85 +                       error);
  86 +               goto error_cleanup_open;
  87 +       }
  88 +
  89         /*
  90          * Discover MC objects in DPRC object:
  91          */
  92 @@ -788,6 +822,8 @@ static int dprc_remove(struct fsl_mc_dev
  93                 fsl_mc_uapi_remove_device_file(mc_bus);
  94         }
  95
  96 +       device_remove_file(&mc_dev->dev, &dev_attr_rescan);
  97 +
  98         dev_info(&mc_dev->dev, "DPRC device unbound from driver");
  99         return 0;
 100  }