This new command can dump all device resources associated to each device. The fields in every line shows: - The address of the resource - The size of the resource - The name of the release function - The stage in which the resource has been acquired (BIND/PROBE)
The output looks like this:
=> devres - root_driver - soc - extbus - serial@54006800 0xbfb541e8 (8 byte) devm_kmalloc_release BIND 0xbfb54440 (4 byte) devm_kmalloc_release PROBE 0xbfb54460 (4 byte) devm_kmalloc_release PROBE - serial@54006900 0xbfb54270 (8 byte) devm_kmalloc_release BIND - gpio@55000000 - i2c@58780000 0xbfb5bce8 (12 byte) devm_kmalloc_release PROBE 0xbfb5bd10 (4 byte) devm_kmalloc_release PROBE - eeprom 0xbfb54418 (12 byte) devm_kmalloc_release BIND
Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com ---
Changes in v3: None Changes in v2: - add static to dump_resources()
drivers/core/Kconfig | 6 ++++++ drivers/core/devres.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+)
diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig index e1d8a6a..7dca35c 100644 --- a/drivers/core/Kconfig +++ b/drivers/core/Kconfig @@ -81,3 +81,9 @@ config DEBUG_DEVRES debug resource management for a managed device.
If you are unsure about this, Say N here. + +config CMD_DEVRES + bool "Managed device resources dump command" + depends on DEBUG_DEVRES + help + This command displays all resources allociated to each device. diff --git a/drivers/core/devres.c b/drivers/core/devres.c index ae0c191..77f39a5 100644 --- a/drivers/core/devres.c +++ b/drivers/core/devres.c @@ -13,6 +13,7 @@ #include <linux/kernel.h> #include <linux/list.h> #include <dm/device.h> +#include <dm/root.h>
struct devres { struct list_head entry; @@ -186,6 +187,42 @@ void devres_release_all(struct udevice *dev) release_nodes(dev, &dev->devres_head, false); }
+#ifdef CONFIG_CMD_DEVRES +static void dump_resources(struct udevice *dev, int depth) +{ + struct devres *dr; + struct udevice *child; + + printf("- %s\n", dev->name); + + list_for_each_entry(dr, &dev->devres_head, entry) + printf(" 0x%p (%lu byte) %s %s\n", dr, + (unsigned long)dr->size, dr->name, + dr->probe ? "PROBE" : "BIND"); + + list_for_each_entry(child, &dev->child_head, sibling_node) + dump_resources(child, depth + 1); +} + +static int do_devres(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + struct udevice *root; + + root = dm_root(); + if (root) + dump_resources(root, 0); + + return 0; +} + +U_BOOT_CMD( + devres, 1, 1, do_devres, + "show device resources", + "" +); +#endif + /* * Managed kmalloc/kfree */