[PATCH v11 06/15] FWU: Add helper functions for accessing FWU metadata
Sughosh Ganu
sughosh.ganu at linaro.org
Wed Sep 28 11:29:47 CEST 2022
Add weak functions for getting the update index value and dfu
alternate number needed for FWU Multi Bank update
functionality.
The current implementation for getting the update index value is for
platforms with 2 banks. If a platform supports more than 2 banks, it
can implement it's own function. The function to get the dfu alternate
number has been added for platforms with GPT partitioned storage
devices. Platforms with other storage partition scheme need to
implement their own function.
Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
Reviewed-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere at linaro.org>
---
Changes since V10: None
Note: I have not changed the logic of the check in
fwu_gpt_get_alt_num(). This can be extended if and when another GPT
based device gets added to the DFU framework.
include/fwu.h | 29 ++++++++++
lib/fwu_updates/fwu.c | 27 +++++++++
lib/fwu_updates/fwu_gpt.c | 114 ++++++++++++++++++++++++++++++++++++++
3 files changed, 170 insertions(+)
create mode 100644 lib/fwu_updates/fwu_gpt.c
diff --git a/include/fwu.h b/include/fwu.h
index 167f91388e..99f43f07b0 100644
--- a/include/fwu.h
+++ b/include/fwu.h
@@ -212,4 +212,33 @@ int fwu_accept_image(efi_guid_t *img_type_id, u32 bank);
*/
int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank);
+/**
+ * fwu_plat_get_alt_num() - Get the DFU Alt Num for the image from the platform
+ * @dev: FWU device
+ * @image_guid: Image GUID for which DFU alt number needs to be retrieved
+ * @alt_num: Pointer to the alt_num
+ *
+ * Get the DFU alt number from the platform for the image specified by the
+ * image GUID.
+ *
+ * Return: 0 if OK, -ve on error
+ *
+ */
+int fwu_plat_get_alt_num(struct udevice *dev, efi_guid_t *image_guid,
+ u8 *alt_num);
+
+/**
+ * fwu_plat_get_update_index() - Get the value of the update bank
+ * @update_idx: Bank number to which images are to be updated
+ *
+ * Get the value of the bank(partition) to which the update needs to be
+ * made.
+ *
+ * Note: This is a weak function and platforms can override this with
+ * their own implementation for selection of the update bank.
+ *
+ * Return: 0 if OK, -ve on error
+ *
+ */
+int fwu_plat_get_update_index(uint *update_idx);
#endif /* _FWU_H_ */
diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c
index fe8058bc37..5cf6bec6a0 100644
--- a/lib/fwu_updates/fwu.c
+++ b/lib/fwu_updates/fwu.c
@@ -361,3 +361,30 @@ int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank)
return fwu_clrset_image_accept(img_type_id, bank,
IMAGE_ACCEPT_CLEAR);
}
+
+/**
+ * fwu_plat_get_update_index() - Get the value of the update bank
+ * @update_idx: Bank number to which images are to be updated
+ *
+ * Get the value of the bank(partition) to which the update needs to be
+ * made.
+ *
+ * Note: This is a weak function and platforms can override this with
+ * their own implementation for selection of the update bank.
+ *
+ * Return: 0 if OK, -ve on error
+ *
+ */
+__weak int fwu_plat_get_update_index(uint *update_idx)
+{
+ int ret;
+ u32 active_idx;
+
+ ret = fwu_get_active_index(&active_idx);
+ if (ret < 0)
+ return -1;
+
+ *update_idx = (active_idx + 1) % CONFIG_FWU_NUM_BANKS;
+
+ return ret;
+}
diff --git a/lib/fwu_updates/fwu_gpt.c b/lib/fwu_updates/fwu_gpt.c
new file mode 100644
index 0000000000..a1b0f3bea7
--- /dev/null
+++ b/lib/fwu_updates/fwu_gpt.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2022, Linaro Limited
+ */
+
+#include <blk.h>
+#include <dfu.h>
+#include <efi.h>
+#include <efi_loader.h>
+#include <fwu.h>
+#include <log.h>
+#include <part.h>
+
+#include <linux/errno.h>
+
+static int get_gpt_dfu_identifier(struct blk_desc *desc, efi_guid_t *image_guid)
+{
+ int i;
+ struct disk_partition info;
+ efi_guid_t unique_part_guid;
+
+ for (i = 1; i < MAX_SEARCH_PARTITIONS; i++) {
+ if (part_get_info(desc, i, &info))
+ continue;
+ uuid_str_to_bin(info.uuid, unique_part_guid.b,
+ UUID_STR_FORMAT_GUID);
+
+ if (!guidcmp(&unique_part_guid, image_guid))
+ return i;
+ }
+
+ log_err("No partition found with image_guid %pUs\n", image_guid);
+ return -ENOENT;
+}
+
+static int fwu_gpt_get_alt_num(struct blk_desc *desc, efi_guid_t *image_guid,
+ u8 *alt_num, unsigned char dfu_dev)
+{
+ int ret = -1;
+ int i, part, dev_num;
+ int nalt;
+ struct dfu_entity *dfu;
+
+ dev_num = desc->devnum;
+ part = get_gpt_dfu_identifier(desc, image_guid);
+ if (part < 0)
+ return -ENOENT;
+
+ dfu_init_env_entities(NULL, NULL);
+
+ nalt = 0;
+ list_for_each_entry(dfu, &dfu_list, list)
+ nalt++;
+
+ if (!nalt) {
+ log_warning("No entities in dfu_alt_info\n");
+ dfu_free_entities();
+ return -ENOENT;
+ }
+
+ for (i = 0; i < nalt; i++) {
+ dfu = dfu_get_entity(i);
+
+ if (!dfu)
+ continue;
+
+ /*
+ * Currently, Multi Bank update
+ * feature is being supported
+ * only on GPT partitioned
+ * MMC/SD devices.
+ */
+ if (dfu->dev_type != dfu_dev)
+ continue;
+
+ if (dfu->layout == DFU_RAW_ADDR &&
+ dfu->data.mmc.dev_num == dev_num &&
+ dfu->data.mmc.part == part) {
+ *alt_num = dfu->alt;
+ ret = 0;
+ break;
+ }
+ }
+
+ dfu_free_entities();
+
+ return ret;
+}
+
+/**
+ * fwu_plat_get_alt_num() - Get the DFU alt number
+ * @dev: FWU metadata device
+ * @image_guid: GUID value of the image for which the alt num is to
+ * be obtained
+ * @alt_num: The DFU alt number for the image that is to be updated
+ *
+ * Get the DFU alt number for the image that is to be updated. The
+ * image is identified with the image_guid parameter that is passed
+ * to the function.
+ *
+ * Note: This is a weak function and platforms can override this with
+ * their own implementation for obtaining the alt number value.
+ *
+ * Return: 0 if OK, -ve on error
+ *
+ */
+__weak int fwu_plat_get_alt_num(struct udevice *dev, efi_guid_t *image_guid,
+ u8 *alt_num)
+{
+ struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
+
+ return fwu_gpt_get_alt_num(dev_get_uclass_plat(priv->blk_dev),
+ image_guid, alt_num, DFU_DEV_MMC);
+}
--
2.34.1
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