git.openwrt.org Git - openwrt/staging/981213.git/blob

   1 From 238065901c1b476a5b093f1710773322b3344847 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Mon, 24 Sep 2018 16:51:13 +0100
   4 Subject: [PATCH] staging: mmal-vchiq: Allocate and free components as
   5  required
   6
   7 The existing code assumed that there would only ever be 4 components,
   8 and never freed the entries once used.
   9 Allow arbitrary creation and destruction of components.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  12 ---
  13  .../vc04_services/vchiq-mmal/mmal-vchiq.c     | 29 ++++++++++++-------
  14  .../vc04_services/vchiq-mmal/mmal-vchiq.h     |  1 +
  15  2 files changed, 20 insertions(+), 10 deletions(-)
  16
  17 --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
  18 +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
  19 @@ -37,8 +37,11 @@ MODULE_AUTHOR("Dave Stevenson, <dave.ste
  20  MODULE_LICENSE("GPL");
  21  MODULE_VERSION("0.0.1");
  22
  23 -/* maximum number of components supported */
  24 -#define VCHIQ_MMAL_MAX_COMPONENTS 4
  25 +/*
  26 + * maximum number of components supported.
  27 + * This matches the maximum permitted by default on the VPU
  28 + */
  29 +#define VCHIQ_MMAL_MAX_COMPONENTS 64
  30
  31  /*#define FULL_MSG_DUMP 1*/
  32
  33 @@ -173,8 +176,6 @@ struct vchiq_mmal_instance {
  34         /* protect accesses to context_map */
  35         struct mutex context_map_lock;
  36
  37 -       /* component to use next */
  38 -       int component_idx;
  39         struct vchiq_mmal_component component[VCHIQ_MMAL_MAX_COMPONENTS];
  40
  41         /* ordered workqueue to process all bulk operations */
  42 @@ -1631,18 +1632,24 @@ int vchiq_mmal_component_init(struct vch
  43  {
  44         int ret;
  45         int idx;                /* port index */
  46 -       struct vchiq_mmal_component *component;
  47 +       struct vchiq_mmal_component *component = NULL;
  48
  49         if (mutex_lock_interruptible(&instance->vchiq_mutex))
  50                 return -EINTR;
  51
  52 -       if (instance->component_idx == VCHIQ_MMAL_MAX_COMPONENTS) {
  53 +       for (idx = 0; idx < VCHIQ_MMAL_MAX_COMPONENTS; idx++) {
  54 +               if (!instance->component[idx].in_use) {
  55 +                       component = &instance->component[idx];
  56 +                       component->in_use = 1;
  57 +                       break;
  58 +               }
  59 +       }
  60 +
  61 +       if (!component) {
  62                 ret = -EINVAL;  /* todo is this correct error? */
  63                 goto unlock;
  64         }
  65
  66 -       component = &instance->component[instance->component_idx];
  67 -
  68         ret = create_component(instance, component, name);
  69         if (ret < 0) {
  70                 pr_err("%s: failed to create component %d (Not enough GPU mem?)\n",
  71 @@ -1693,8 +1700,6 @@ int vchiq_mmal_component_init(struct vch
  72                         goto release_component;
  73         }
  74
  75 -       instance->component_idx++;
  76 -
  77         *component_out = component;
  78
  79         mutex_unlock(&instance->vchiq_mutex);
  80 @@ -1704,6 +1709,8 @@ int vchiq_mmal_component_init(struct vch
  81  release_component:
  82         destroy_component(instance, component);
  83  unlock:
  84 +       if (component)
  85 +               component->in_use = 0;
  86         mutex_unlock(&instance->vchiq_mutex);
  87
  88         return ret;
  89 @@ -1726,6 +1733,8 @@ int vchiq_mmal_component_finalise(struct
  90
  91         ret = destroy_component(instance, component);
  92
  93 +       component->in_use = 0;
  94 +
  95         mutex_unlock(&instance->vchiq_mutex);
  96
  97         return ret;
  98 --- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
  99 +++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
 100 @@ -82,6 +82,7 @@ struct vchiq_mmal_port {
 101  };
 102
 103  struct vchiq_mmal_component {
 104 +       u32 in_use:1;
 105         u32 enabled:1;
 106         u32 handle;  /* VideoCore handle for component */
 107         u32 inputs;  /* Number of input ports */