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authorTim Wawrzynczak <twawrzynczak@chromium.org>2020-08-25 16:49:45 -0600
committerPatrick Georgi <pgeorgi@google.com>2020-08-31 06:38:09 +0000
commit299f3f834fe326d84b2e0e062b8f54196d657368 (patch)
tree0691d5aafca9246e61f4e9900ad05c129b71041c
parent668132a47c97f22631b021a580f694ea8680e927 (diff)
downloadcoreboot-299f3f834fe326d84b2e0e062b8f54196d657368.tar.xz
fw_config: Add caching to successfully probed fields
Add a backing cache for all successfully probed fw_config fields that originated as `probe` statements in the devicetree. This allows recall of the `struct fw_config` which was probed. BUG=b:161963281 TEST=tested with follower patch Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Change-Id: I0d014206a4ee6cc7592e12e704a7708652330eaf Reviewed-on: https://review.coreboot.org/c/coreboot/+/44782 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
-rw-r--r--src/include/fw_config.h15
-rw-r--r--src/lib/fw_config.c37
2 files changed, 52 insertions, 0 deletions
diff --git a/src/include/fw_config.h b/src/include/fw_config.h
index d41afd6c5d..81980b93ae 100644
--- a/src/include/fw_config.h
+++ b/src/include/fw_config.h
@@ -40,6 +40,21 @@ struct fw_config {
*/
bool fw_config_probe(const struct fw_config *match);
+/**
+ * fw_config_for_each_found() - Call a callback for each fw_config field found
+ * @cb: The callback function
+ * @arg: A context argument that is passed to the callback
+ */
+void fw_config_for_each_found(void (*cb)(const struct fw_config *config, void *arg), void *arg);
+
+/**
+ * fw_config_get_found() - Return a pointer to the fw_config struct for a given field.
+ * @field_mask: A field mask from static.h, e.g., FW_CONFIG_FIELD_FEATURE_MASK
+ *
+ * Return pointer to cached `struct fw_config` if successfully probed, otherwise NULL.
+*/
+const struct fw_config *fw_config_get_found(uint32_t field_mask);
+
#else
static inline bool fw_config_probe(const struct fw_config *match)
diff --git a/src/lib/fw_config.c b/src/lib/fw_config.c
index e97cfdc72a..fdfab0aab0 100644
--- a/src/lib/fw_config.c
+++ b/src/lib/fw_config.c
@@ -1,11 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0-only */
+#include <assert.h>
#include <bootstate.h>
#include <cbfs.h>
#include <console/console.h>
#include <device/device.h>
#include <ec/google/chromeec/ec.h>
#include <fw_config.h>
+#include <lib.h>
#include <stdbool.h>
#include <stdint.h>
@@ -66,6 +68,40 @@ bool fw_config_probe(const struct fw_config *match)
}
#if ENV_RAMSTAGE
+
+/*
+ * The maximum number of fw_config fields is limited by the 32-bit mask that is used to
+ * represent them.
+ */
+#define MAX_CACHE_ELEMENTS (8 * sizeof(uint32_t))
+
+static const struct fw_config *cached_configs[MAX_CACHE_ELEMENTS];
+
+static size_t probe_index(uint32_t mask)
+{
+ assert(mask);
+ return __ffs(mask);
+}
+
+const struct fw_config *fw_config_get_found(uint32_t field_mask)
+{
+ const struct fw_config *config;
+ config = cached_configs[probe_index(field_mask)];
+ if (config && config->mask == field_mask)
+ return config;
+
+ return NULL;
+}
+
+void fw_config_for_each_found(void (*cb)(const struct fw_config *config, void *arg), void *arg)
+{
+ size_t i;
+
+ for (i = 0; i < MAX_CACHE_ELEMENTS; ++i)
+ if (cached_configs[i])
+ cb(cached_configs[i], arg);
+}
+
static void fw_config_init(void *unused)
{
struct device *dev;
@@ -80,6 +116,7 @@ static void fw_config_init(void *unused)
for (probe = dev->probe_list; probe && probe->mask != 0; probe++) {
if (fw_config_probe(probe)) {
match = true;
+ cached_configs[probe_index(probe->mask)] = probe;
break;
}
}