[PATCH v4 26/42] dm: core: Create a struct for device runtime info
Simon Glass
sjg at chromium.org
Mon Mar 15 05:25:36 CET 2021
At present when driver model needs to change a device it simply updates
the struct udevice structure. But with of-platdata-inst most of the fields
are not modified at runtime. In fact, typically only the flags need to
change.
For systems running SPL from read-only memory it is convenient to separate
out the runtime information, so that the devices don't need to be copied
before being used.
Create a new udevice_rt table, similar to the existing driver_rt. For now
it just holds the flags, although they are not used in this patch.
Add a new Kconfig for the driver_rt data, since this is not needed when
of-platdata-inst is used.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
(no changes since v2)
Changes in v2:
- Use separate OF_PLATDATA_DRIVER_RT Kconfigs for driver run-time data
- Update the condition for dm_test_of_plat_dev()
drivers/core/root.c | 14 +++++++++++++-
dts/Kconfig | 20 ++++++++++++++++++++
include/asm-generic/global_data.h | 16 ++++++++++++++--
include/dm/device.h | 15 +++++++++++++++
test/dm/of_platdata.c | 2 +-
5 files changed, 63 insertions(+), 4 deletions(-)
diff --git a/drivers/core/root.c b/drivers/core/root.c
index 3e52452cd85..446ac2ff774 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -133,6 +133,18 @@ static int dm_setup_inst(void)
{
DM_ROOT_NON_CONST = DM_DEVICE_GET(root);
+ if (CONFIG_IS_ENABLED(OF_PLATDATA_RT)) {
+ struct udevice_rt *urt;
+ int n_ents;
+
+ /* Allocate the udevice_rt table */
+ n_ents = ll_entry_count(struct udevice, udevice);
+ urt = calloc(n_ents, sizeof(struct udevice_rt));
+ if (!urt)
+ return log_msg_ret("urt", -ENOMEM);
+ gd_set_dm_udevice_rt(urt);
+ }
+
return 0;
}
@@ -205,7 +217,7 @@ int dm_scan_plat(bool pre_reloc_only)
{
int ret;
- if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
+ if (CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)) {
struct driver_rt *dyn;
int n_ents;
diff --git a/dts/Kconfig b/dts/Kconfig
index e6bbdc596bd..99ce75e1a2a 100644
--- a/dts/Kconfig
+++ b/dts/Kconfig
@@ -338,6 +338,7 @@ config SPL_OF_PLATDATA
bool "Generate platform data for use in SPL"
depends on SPL_OF_CONTROL
select DTOC
+ select SPL_OF_PLATDATA_DRIVER_RT if !SPL_OF_PLATDATA_INST
help
For very constrained SPL environments the overhead of decoding
device tree nodes and converting their contents into platform data
@@ -391,12 +392,22 @@ config SPL_OF_PLATDATA_RT
struct udevice (at present just the flags) into a separate struct,
which is allocated at runtime.
+config SPL_OF_PLATDATA_DRIVER_RT
+ bool
+ help
+ Use a separate struct for driver runtime data.
+
+ This enables the driver_rt information, used with of-platdata when
+ of-platdata-inst is not used. It allows finding devices by their
+ driver data.
+
endif
config TPL_OF_PLATDATA
bool "Generate platform data for use in TPL"
depends on TPL_OF_CONTROL
select DTOC
+ select TPL_OF_PLATDATA_DRIVER_RT if !TPL_OF_PLATDATA_INST
help
For very constrained SPL environments the overhead of decoding
device tree nodes and converting their contents into platform data
@@ -451,6 +462,15 @@ config TPL_OF_PLATDATA_RT
struct udevice (at present just the flags) into a separate struct,
which is allocated at runtime.
+config TPL_OF_PLATDATA_DRIVER_RT
+ bool
+ help
+ Use a separate struct for driver runtime data.
+
+ This enables the driver_rt information, used with of-platdata when
+ of-platdata-inst is not used. It allows finding devices by their
+ driver data.
+
endif
endmenu
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index b6a9991fc9a..b88361cd087 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -215,10 +215,14 @@ struct global_data {
* @uclass_root_s.
*/
struct list_head *uclass_root;
-# if CONFIG_IS_ENABLED(OF_PLATDATA)
+# if CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)
/** @dm_driver_rt: Dynamic info about the driver */
struct driver_rt *dm_driver_rt;
# endif
+#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
+ /** @dm_udevice_rt: Dynamic info about the udevice */
+ struct udevice_rt *dm_udevice_rt;
+# endif
#endif
#ifdef CONFIG_TIMER
/**
@@ -477,7 +481,7 @@ struct global_data {
#define gd_set_of_root(_root)
#endif
-#if CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT)
#define gd_set_dm_driver_rt(dyn) gd->dm_driver_rt = dyn
#define gd_dm_driver_rt() gd->dm_driver_rt
#else
@@ -485,6 +489,14 @@ struct global_data {
#define gd_dm_driver_rt() NULL
#endif
+#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
+#define gd_set_dm_udevice_rt(dyn) gd->dm_udevice_rt = dyn
+#define gd_dm_udevice_rt() gd->dm_udevice_rt
+#else
+#define gd_set_dm_udevice_rt(dyn)
+#define gd_dm_udevice_rt() NULL
+#endif
+
#ifdef CONFIG_GENERATE_ACPI_TABLE
#define gd_acpi_ctx() gd->acpi_ctx
#else
diff --git a/include/dm/device.h b/include/dm/device.h
index 9183356468f..8e16f2ea497 100644
--- a/include/dm/device.h
+++ b/include/dm/device.h
@@ -190,6 +190,21 @@ struct udevice {
#endif
};
+/**
+ * udevice_rt - runtime information set up by U-Boot
+ *
+ * This is only used with OF_PLATDATA_RT
+ *
+ * There is one of these for every udevice in the linker list, indexed by
+ * the udevice_info idx value.
+ *
+ * @flags_: Flags for this device DM_FLAG_... (do not access outside driver
+ * model)
+ */
+struct udevice_rt {
+ u32 flags_;
+};
+
/* Maximum sequence number supported */
#define DM_MAX_SEQ 999
diff --git a/test/dm/of_platdata.c b/test/dm/of_platdata.c
index f2b45b9a868..0f89c7a7da8 100644
--- a/test/dm/of_platdata.c
+++ b/test/dm/of_platdata.c
@@ -147,7 +147,7 @@ static int dm_test_of_plat_dev(struct unit_test_state *uts)
uint i;
/* Skip this test if there is no platform data */
- if (CONFIG_IS_ENABLED(OF_PLATDATA_INST))
+ if (!CONFIG_IS_ENABLED(OF_PLATDATA_DRIVER_RT))
return 0;
/* Record the indexes that are found */
--
2.31.0.rc2.261.g7f71774620-goog
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