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interconnect: Add sync state support

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The bootloaders often do some initial configuration of the interconnects
in the system and we want to keep this configuration until all consumers
have probed and expressed their bandwidth needs. This is because we don't
want to change the configuration by starting to disable unused paths until
every user had a chance to request the amount of bandwidth it needs.

To accomplish this we will implement an interconnect specific sync_state
callback which will synchronize (aggregate and set) the current bandwidth
settings when all consumers have been probed.

Link: https://lore.kernel.org/r/20200825170152.6434-3-georgi.djakov@linaro.org
Reviewed-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
This commit is contained in:
Georgi Djakov 2020-08-25 20:01:51 +03:00
parent cc80d10d6f
commit b1d681d8d3
2 changed files with 72 additions and 0 deletions
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67
drivers/interconnect/core.c
View File

@ -26,6 +26,8 @@
static DEFINE_IDR(icc_idr);
static LIST_HEAD(icc_providers);
static int providers_count;
static bool synced_state;
static DEFINE_MUTEX(icc_lock);
static struct dentry *icc_debugfs_dir;
@ -267,6 +269,12 @@ static int aggregate_requests(struct icc_node *node)
}
p->aggregate(node, r->tag, avg_bw, peak_bw,
&node->avg_bw, &node->peak_bw);
/* during boot use the initial bandwidth as a floor value */
if (!synced_state) {
node->avg_bw = max(node->avg_bw, node->init_avg);
node->peak_bw = max(node->peak_bw, node->init_peak);
}
}
return 0;
@ -931,6 +939,19 @@ void icc_node_add(struct icc_node *node, struct icc_provider *provider)
node->provider = provider;
list_add_tail(&node->node_list, &provider->nodes);
/* get the initial bandwidth values and sync them with hardware */
if (provider->get_bw) {
provider->get_bw(node, &node->init_avg, &node->init_peak);
} else {
node->init_avg = INT_MAX;
node->init_peak = INT_MAX;
}
node->avg_bw = node->init_avg;
node->peak_bw = node->init_peak;
provider->set(node, node);
node->avg_bw = 0;
node->peak_bw = 0;
mutex_unlock(&icc_lock);
}
EXPORT_SYMBOL_GPL(icc_node_add);
@ -1026,8 +1047,54 @@ int icc_provider_del(struct icc_provider *provider)
}
EXPORT_SYMBOL_GPL(icc_provider_del);
static int of_count_icc_providers(struct device_node *np)
{
struct device_node *child;
int count = 0;
for_each_available_child_of_node(np, child) {
if (of_property_read_bool(child, "#interconnect-cells"))
count++;
count += of_count_icc_providers(child);
}
of_node_put(np);
return count;
}
void icc_sync_state(struct device *dev)
{
struct icc_provider *p;
struct icc_node *n;
static int count;
count++;
if (count < providers_count)
return;
mutex_lock(&icc_lock);
synced_state = true;
list_for_each_entry(p, &icc_providers, provider_list) {
dev_dbg(p->dev, "interconnect provider is in synced state\n");
list_for_each_entry(n, &p->nodes, node_list) {
if (n->init_avg || n->init_peak) {
aggregate_requests(n);
p->set(n, n);
}
}
}
mutex_unlock(&icc_lock);
}
EXPORT_SYMBOL_GPL(icc_sync_state);
static int __init icc_init(void)
{
struct device_node *root = of_find_node_by_path("/");
providers_count = of_count_icc_providers(root);
of_node_put(root);
icc_debugfs_dir = debugfs_create_dir("interconnect", NULL);
debugfs_create_file("interconnect_summary", 0444,
icc_debugfs_dir, NULL, &icc_summary_fops);

5
include/linux/interconnect-provider.h
View File

@ -75,6 +75,8 @@ struct icc_provider {
* @req_list: a list of QoS constraint requests associated with this node
* @avg_bw: aggregated value of average bandwidth requests from all consumers
* @peak_bw: aggregated value of peak bandwidth requests from all consumers
* @init_avg: average bandwidth value that is read from the hardware during init
* @init_peak: peak bandwidth value that is read from the hardware during init
* @data: pointer to private data
*/
struct icc_node {
@ -91,6 +93,8 @@ struct icc_node {
struct hlist_head req_list;
u32 avg_bw;
u32 peak_bw;
u32 init_avg;
u32 init_peak;
void *data;
};
@ -108,6 +112,7 @@ int icc_nodes_remove(struct icc_provider *provider);
int icc_provider_add(struct icc_provider *provider);
int icc_provider_del(struct icc_provider *provider);
struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec);
void icc_sync_state(struct device *dev);
#else