[PATCH v2 09/20] dm: add tag support
AKASHI Takahiro
takahiro.akashi at linaro.org
Thu Feb 10 09:11:13 CET 2022
With dm-tag feature, any U-Boot subsystem is allowed to associate
arbitrary number of data with a particular udevice. This can been
see as expanding "struct udevice" without modifying the definition.
As a first user, UEFI subsystem makes use of tags to associate
an efi_disk object with a block device.
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
drivers/core/Makefile | 2 +-
drivers/core/root.c | 2 +
drivers/core/tag.c | 139 ++++++++++++++++++++++++++++++
include/asm-generic/global_data.h | 4 +
include/dm/tag.h | 110 +++++++++++++++++++++++
5 files changed, 256 insertions(+), 1 deletion(-)
create mode 100644 drivers/core/tag.c
create mode 100644 include/dm/tag.h
diff --git a/drivers/core/Makefile b/drivers/core/Makefile
index 5edd4e413576..3742e7574525 100644
--- a/drivers/core/Makefile
+++ b/drivers/core/Makefile
@@ -2,7 +2,7 @@
#
# Copyright (c) 2013 Google, Inc
-obj-y += device.o fdtaddr.o lists.o root.o uclass.o util.o
+obj-y += device.o fdtaddr.o lists.o root.o uclass.o util.o tag.o
obj-$(CONFIG_$(SPL_TPL_)ACPIGEN) += acpi.o
obj-$(CONFIG_DEVRES) += devres.o
obj-$(CONFIG_$(SPL_)DM_DEVICE_REMOVE) += device-remove.o
diff --git a/drivers/core/root.c b/drivers/core/root.c
index e3f87956d866..1aa4819ceb6c 100644
--- a/drivers/core/root.c
+++ b/drivers/core/root.c
@@ -199,6 +199,8 @@ int dm_init(bool of_live)
return ret;
}
+ INIT_LIST_HEAD((struct list_head *)&gd->dmtag_list);
+
return 0;
}
diff --git a/drivers/core/tag.c b/drivers/core/tag.c
new file mode 100644
index 000000000000..6829bcd8806c
--- /dev/null
+++ b/drivers/core/tag.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2021 Linaro Limited
+ * Author: AKASHI Takahiro
+ */
+
+#include <malloc.h>
+#include <asm/global_data.h>
+#include <dm/tag.h>
+#include <linux/err.h>
+#include <linux/list.h>
+#include <linux/types.h>
+
+struct udevice;
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dev_tag_set_ptr(struct udevice *dev, enum dm_tag_t tag, void *ptr)
+{
+ struct dmtag_node *node;
+
+ if (!dev || tag >= DM_TAG_COUNT)
+ return -EINVAL;
+
+ list_for_each_entry(node, &gd->dmtag_list, sibling) {
+ if (node->dev == dev && node->tag == tag)
+ return -EEXIST;
+ }
+
+ node = calloc(sizeof(*node), 1);
+ if (!node)
+ return -ENOSPC;
+
+ node->dev = dev;
+ node->tag = tag;
+ node->ptr = ptr;
+ list_add_tail(&node->sibling, (struct list_head *)&gd->dmtag_list);
+
+ return 0;
+}
+
+int dev_tag_set_val(struct udevice *dev, enum dm_tag_t tag, ulong val)
+{
+ struct dmtag_node *node;
+
+ if (!dev || tag >= DM_TAG_COUNT)
+ return -EINVAL;
+
+ list_for_each_entry(node, &gd->dmtag_list, sibling) {
+ if (node->dev == dev && node->tag == tag)
+ return -EEXIST;
+ }
+
+ node = calloc(sizeof(*node), 1);
+ if (!node)
+ return -ENOSPC;
+
+ node->dev = dev;
+ node->tag = tag;
+ node->val = val;
+ list_add_tail(&node->sibling, (struct list_head *)&gd->dmtag_list);
+
+ return 0;
+}
+
+int dev_tag_get_ptr(struct udevice *dev, enum dm_tag_t tag, void **ptrp)
+{
+ struct dmtag_node *node;
+
+ if (!dev || tag >= DM_TAG_COUNT)
+ return -EINVAL;
+
+ list_for_each_entry(node, &gd->dmtag_list, sibling) {
+ if (node->dev == dev && node->tag == tag) {
+ *ptrp = node->ptr;
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+int dev_tag_get_val(struct udevice *dev, enum dm_tag_t tag, ulong *valp)
+{
+ struct dmtag_node *node;
+
+ if (!dev || tag >= DM_TAG_COUNT)
+ return -EINVAL;
+
+ list_for_each_entry(node, &gd->dmtag_list, sibling) {
+ if (node->dev == dev && node->tag == tag) {
+ *valp = node->val;
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+int dev_tag_del(struct udevice *dev, enum dm_tag_t tag)
+{
+ struct dmtag_node *node, *tmp;
+
+ if (!dev || tag >= DM_TAG_COUNT)
+ return -EINVAL;
+
+ list_for_each_entry_safe(node, tmp, &gd->dmtag_list, sibling) {
+ if (node->dev == dev && node->tag == tag) {
+ list_del(&node->sibling);
+ free(node);
+
+ return 0;
+ }
+ }
+
+ return -ENOENT;
+}
+
+int dev_tag_del_all(struct udevice *dev)
+{
+ struct dmtag_node *node, *tmp;
+ bool found = false;
+
+ if (!dev)
+ return -EINVAL;
+
+ list_for_each_entry_safe(node, tmp, &gd->dmtag_list, sibling) {
+ if (node->dev == dev) {
+ list_del(&node->sibling);
+ free(node);
+ found = true;
+ }
+ }
+
+ if (found)
+ return 0;
+
+ return -ENOENT;
+}
diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index a65a85de3ea5..5b599a274847 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -473,6 +473,10 @@ struct global_data {
*/
struct event_state *event_state;
#endif
+ /**
+ * @dmtag_list: List of DM tags
+ */
+ struct list_head dmtag_list;
};
#ifndef DO_DEPS_ONLY
static_assert(sizeof(struct global_data) == GD_SIZE);
diff --git a/include/dm/tag.h b/include/dm/tag.h
new file mode 100644
index 000000000000..54fc31eb1539
--- /dev/null
+++ b/include/dm/tag.h
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2021 Linaro Limited
+ * Author: AKASHI Takahiro
+ */
+
+#ifndef _DM_TAG_H
+#define _DM_TAG_H
+
+#include <linux/list.h>
+#include <linux/types.h>
+
+struct udevice;
+
+enum dm_tag_t {
+ /* EFI_LOADER */
+ DM_TAG_EFI = 0,
+
+ DM_TAG_COUNT,
+};
+
+/**
+ * dmtag_node
+ *
+ * @sibling: List of dm-tag nodes
+ * @dev: Associated udevice
+ * @tag: Tag type
+ * @ptr: Pointer as a value
+ * @val: Value
+ */
+struct dmtag_node {
+ struct list_head sibling;
+ struct udevice *dev;
+ enum dm_tag_t tag;
+ union {
+ void *ptr;
+ ulong val;
+ };
+};
+
+/**
+ * dev_tag_set_ptr() - set a tag's value as a pointer
+ * @dev: Device to operate
+ * @tag: Tag type
+ * @ptr: Pointer to set
+ *
+ * Set the value, @ptr, as of @tag associated with the device, @dev
+ *
+ * Return: 0 on success, -ve on error
+ */
+int dev_tag_set_ptr(struct udevice *dev, enum dm_tag_t tag, void *ptr);
+
+/**
+ * dev_tag_set_val() set a tag's value as an integer
+ * @dev: Device to operate
+ * @tag: Tag type
+ * @val: Value to set
+ *
+ * Set the value, @val, as of @tag associated with the device, @dev
+ *
+ * Return: on success, -ve on error
+ */
+int dev_tag_set_val(struct udevice *dev, enum dm_tag_t tag, ulong val);
+
+/**
+ * dev_tag_get_ptr() - get a tag's value as a pointer
+ * @dev: Device to operate
+ * @tag: Tag type
+ * @ptrp: Pointer to tag's value (pointer)
+ *
+ * Get a tag's value as a pointer
+ *
+ * Return: on success, -ve on error
+ */
+int dev_tag_get_ptr(struct udevice *dev, enum dm_tag_t tag, void **ptrp);
+
+/**
+ * dev_tag_get_val() - get a tag's value as an integer
+ * @dev: Device to operate
+ * @tag: Tag type
+ * @valp: Pointer to tag's value (ulong)
+ *
+ * Get a tag's value as an integer
+ *
+ * Return: 0 on success, -ve on error
+ */
+int dev_tag_get_val(struct udevice *dev, enum dm_tag_t tag, ulong *valp);
+
+/**
+ * dev_tag_del() - delete a tag
+ * @dev: Device to operate
+ * @tag: Tag type
+ *
+ * Delete a tag of @tag associated with the device, @dev
+ *
+ * Return: 0 on success, -ve on error
+ */
+int dev_tag_del(struct udevice *dev, enum dm_tag_t tag);
+
+/**
+ * dev_tag_del_all() - delete all tags
+ * @dev: Device to operate
+ *
+ * Delete all the tags associated with the device, @dev
+ *
+ * Return: 0 on success, -ve on error
+ */
+int dev_tag_del_all(struct udevice *dev);
+
+#endif /* _DM_TAG_H */
--
2.33.0
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