staging: mmal-vchiq: Allocate and free components as required

The existing code assumed that there would only ever be 4 components,
and never freed the entries once used.
Allow arbitrary creation and destruction of components.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>

diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
index fc2e983..365d5cc 100644 (file)
--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c
@@ -38,8 +38,11 @@ MODULE_AUTHOR("Dave Stevenson, <dave.stevenson@raspberrypi.org>");
 MODULE_LICENSE("GPL");
 MODULE_VERSION("0.0.1");
 
-/* maximum number of components supported */
-#define VCHIQ_MMAL_MAX_COMPONENTS 4
+/*
+ * maximum number of components supported.
+ * This matches the maximum permitted by default on the VPU
+ */
+#define VCHIQ_MMAL_MAX_COMPONENTS 64
 
 /*#define FULL_MSG_DUMP 1*/
 
@@ -173,8 +176,6 @@ struct vchiq_mmal_instance {
        struct idr context_map;
        spinlock_t context_map_lock;
 
-       /* component to use next */
-       int component_idx;
        struct vchiq_mmal_component component[VCHIQ_MMAL_MAX_COMPONENTS];
 
        /* ordered workqueue to process all bulk operations */
@@ -1631,18 +1632,24 @@ int vchiq_mmal_component_init(struct vchiq_mmal_instance *instance,
 {
        int ret;
        int idx;                /* port index */
-       struct vchiq_mmal_component *component;
+       struct vchiq_mmal_component *component = NULL;
 
        if (mutex_lock_interruptible(&instance->vchiq_mutex))
                return -EINTR;
 
-       if (instance->component_idx == VCHIQ_MMAL_MAX_COMPONENTS) {
+       for (idx = 0; idx < VCHIQ_MMAL_MAX_COMPONENTS; idx++) {
+               if (!instance->component[idx].in_use) {
+                       component = &instance->component[idx];
+                       component->in_use = 1;
+                       break;
+               }
+       }
+
+       if (!component) {
                ret = -EINVAL;  /* todo is this correct error? */
                goto unlock;
        }
 
-       component = &instance->component[instance->component_idx];
-
        ret = create_component(instance, component, name);
        if (ret < 0) {
                pr_err("%s: failed to create component %d (Not enough GPU mem?)\n",
@@ -1693,8 +1700,6 @@ int vchiq_mmal_component_init(struct vchiq_mmal_instance *instance,
                        goto release_component;
        }
 
-       instance->component_idx++;
-
        *component_out = component;
 
        mutex_unlock(&instance->vchiq_mutex);
@@ -1704,6 +1709,8 @@ int vchiq_mmal_component_init(struct vchiq_mmal_instance *instance,
 release_component:
        destroy_component(instance, component);
 unlock:
+       if (component)
+               component->in_use = 0;
        mutex_unlock(&instance->vchiq_mutex);
 
        return ret;
@@ -1726,6 +1733,8 @@ int vchiq_mmal_component_finalise(struct vchiq_mmal_instance *instance,
 
        ret = destroy_component(instance, component);
 
+       component->in_use = 0;
+
        mutex_unlock(&instance->vchiq_mutex);
 
        return ret;

diff --git a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
index 1750ff0..ffa4555 100644 (file)
--- a/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
+++ b/drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.h
@@ -82,6 +82,7 @@ struct vchiq_mmal_port {
 };
 
 struct vchiq_mmal_component {
+       u32 in_use:1;
        bool enabled;
        u32 handle;  /* VideoCore handle for component */
        u32 inputs;  /* Number of input ports */