target/linux/layerscape/patches-5.4/701-net-0133-bus-fsl-mc-add-bus-rescan-attribute.patch

   1 From 4eba1e0209a52798e1b6a233840a28fc5132cd9c Mon Sep 17 00:00:00 2001
   2 From: Ioana Ciornei <ioana.ciornei@nxp.com>
   3 Date: Mon, 5 Mar 2018 18:38:46 +0200
   4 Subject: [PATCH] bus: fsl-mc: add bus rescan attribute
   5
   6 Introduce the rescan attribute as a bus attribute to
   7 synchronize the fsl-mc bus objects and the MC firmware.
   8
   9 To rescan the fsl-mc bus, e.g.,
  10 echo 1 > /sys/bus/fsl-mc/rescan
  11
  12 Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
  13 ---
  14  Documentation/ABI/stable/sysfs-bus-fsl-mc | 10 ++++++++
  15  drivers/bus/fsl-mc/dprc-driver.c          |  4 +--
  16  drivers/bus/fsl-mc/fsl-mc-bus.c           | 41 +++++++++++++++++++++++++++++++
  17  drivers/bus/fsl-mc/fsl-mc-private.h       |  2 ++
  18  4 files changed, 55 insertions(+), 2 deletions(-)
  19
  20 --- a/Documentation/ABI/stable/sysfs-bus-fsl-mc
  21 +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
  22 @@ -7,3 +7,13 @@ Description:   Writing a non-zero value to
  23                 synchronize the objects under dprc.X and the
  24                 Management Complex firmware.
  25  Users:         Userspace drivers and management tools
  26 +
  27 +What:          /sys/bus/fsl-mc/rescan
  28 +Date:          November 2018
  29 +KernelVersion: 5.0
  30 +Contact:       Ioana Ciornei <ioana.ciornei@nxp.com>
  31 +Description:   Writing a non-zero value to this attribute will
  32 +               force a rescan of fsl-mc bus in the system and
  33 +               synchronize the objects under fsl-mc bus and the
  34 +               Management Complex firmware.
  35 +Users:         Userspace drivers and management tools
  36 --- a/drivers/bus/fsl-mc/dprc-driver.c
  37 +++ b/drivers/bus/fsl-mc/dprc-driver.c
  38 @@ -214,8 +214,8 @@ static void dprc_add_new_devices(struct
  39   * populated before they can get allocation requests from probe callbacks
  40   * of the device drivers for the non-allocatable devices.
  41   */
  42 -static int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
  43 -                            unsigned int *total_irq_count)
  44 +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
  45 +                     unsigned int *total_irq_count)
  46  {
  47         int num_child_objects;
  48         int dprc_get_obj_failures;
  49 --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
  50 +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
  51 @@ -154,12 +154,53 @@ static struct attribute *fsl_mc_dev_attr
  52
  53  ATTRIBUTE_GROUPS(fsl_mc_dev);
  54
  55 +static int scan_fsl_mc_bus(struct device *dev, void *data)
  56 +{
  57 +       struct fsl_mc_device *root_mc_dev;
  58 +       struct fsl_mc_bus *root_mc_bus;
  59 +
  60 +       if (!fsl_mc_is_root_dprc(dev))
  61 +               goto exit;
  62 +
  63 +       root_mc_dev = to_fsl_mc_device(dev);
  64 +       root_mc_bus = to_fsl_mc_bus(root_mc_dev);
  65 +       mutex_lock(&root_mc_bus->scan_mutex);
  66 +       dprc_scan_objects(root_mc_dev, NULL);
  67 +       mutex_unlock(&root_mc_bus->scan_mutex);
  68 +
  69 +exit:
  70 +       return 0;
  71 +}
  72 +
  73 +static ssize_t rescan_store(struct bus_type *bus,
  74 +                           const char *buf, size_t count)
  75 +{
  76 +       unsigned long val;
  77 +
  78 +       if (kstrtoul(buf, 0, &val) < 0)
  79 +               return -EINVAL;
  80 +
  81 +       if (val)
  82 +               bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
  83 +
  84 +       return count;
  85 +}
  86 +static BUS_ATTR_WO(rescan);
  87 +
  88 +static struct attribute *fsl_mc_bus_attrs[] = {
  89 +       &bus_attr_rescan.attr,
  90 +       NULL,
  91 +};
  92 +
  93 +ATTRIBUTE_GROUPS(fsl_mc_bus);
  94 +
  95  struct bus_type fsl_mc_bus_type = {
  96         .name = "fsl-mc",
  97         .match = fsl_mc_bus_match,
  98         .uevent = fsl_mc_bus_uevent,
  99         .dma_configure  = fsl_mc_dma_configure,
 100         .dev_groups = fsl_mc_dev_groups,
 101 +       .bus_groups = fsl_mc_bus_groups,
 102  };
 103  EXPORT_SYMBOL_GPL(fsl_mc_bus_type);
 104
 105 --- a/drivers/bus/fsl-mc/fsl-mc-private.h
 106 +++ b/drivers/bus/fsl-mc/fsl-mc-private.h
 107 @@ -556,6 +556,8 @@ int __init dprc_driver_init(void);
 108
 109  void dprc_driver_exit(void);
 110
 111 +int dprc_scan_objects(struct fsl_mc_device *mc_bus_dev,
 112 +                     unsigned int *total_irq_count);
 113  int __init fsl_mc_allocator_driver_init(void);
 114
 115  void fsl_mc_allocator_driver_exit(void);