| Message ID | 20220928092956.2535777-3-sughosh.ganu@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | FWU: Add FWU Multi Bank Update feature support | expand |
Hello Sughosh, On Wed, 28 Sept 2022 at 11:30, Sughosh Ganu <sughosh.ganu@linaro.org> wrote: > > In the FWU Multi Bank Update feature, the information about the > updatable images is stored as part of the metadata, which is stored on > a dedicated partition. Add the metadata structure, and a driver model > uclass which provides functions to access the metadata. These are > generic API's, and implementations can be added based on parameters > like how the metadata partition is accessed and what type of storage > device houses the metadata. > > Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> > Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> > Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org> > --- > Changes since V10: > * s/fwu_update_active_index/fwu_set_active_index as per comment from > Jassi > * Change the argument type of fwu_set_active_index() to uint from u32 > as per comment from Jassi > * s/mdata_check/check_mdata as per comment from Jassi > * Fix the typo in the function comment of fwu_mdata_check() > > drivers/fwu-mdata/fwu-mdata-uclass.c | 107 ++++++++ > include/dm/uclass-id.h | 1 + > include/fwu.h | 211 ++++++++++++++++ > include/fwu_mdata.h | 67 +++++ > lib/fwu_updates/fwu.c | 363 +++++++++++++++++++++++++++ > 5 files changed, 749 insertions(+) > create mode 100644 drivers/fwu-mdata/fwu-mdata-uclass.c > create mode 100644 include/fwu.h > create mode 100644 include/fwu_mdata.h > create mode 100644 lib/fwu_updates/fwu.c > > diff --git a/drivers/fwu-mdata/fwu-mdata-uclass.c b/drivers/fwu-mdata/fwu-mdata-uclass.c > new file mode 100644 > index 0000000000..4237b89520 > --- /dev/null > +++ b/drivers/fwu-mdata/fwu-mdata-uclass.c > @@ -0,0 +1,107 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright (c) 2022, Linaro Limited > + */ > + > +#define LOG_CATEGORY UCLASS_FWU_MDATA > + > +#include <common.h> > +#include <dm.h> > +#include <efi_loader.h> > +#include <fwu.h> > +#include <fwu_mdata.h> > +#include <log.h> > + > +#include <linux/errno.h> > +#include <linux/types.h> > +#include <u-boot/crc.h> > + > +/** > + * fwu_mdata_check() - Check if the FWU metadata is valid > + * @dev: FWU metadata device > + * > + * Validate both copies of the FWU metadata. If one of the copies > + * has gone bad, restore it from the other copy. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_mdata_check(struct udevice *dev) > +{ > + const struct fwu_mdata_ops *ops = device_get_ops(dev); > + > + if (!ops->check_mdata) { > + log_debug("check_mdata() method not defined\n"); > + return -ENOSYS; > + } > + > + return ops->check_mdata(dev); > +} > + > +/** > + * fwu_get_mdata() - Get a FWU metadata copy > + * @dev: FWU metadata device > + * @mdata: Copy of the FWU metadata > + * > + * Get a valid copy of the FWU metadata. > + * > + * Note: This function is to be called first when modifying any fields > + * in the metadata. The sequence of calls to modify any field in the > + * metadata would be 1) fwu_get_mdata 2) Modify metadata, followed by > + * 3) fwu_update_mdata > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_get_mdata(struct udevice *dev, struct fwu_mdata *mdata) > +{ > + const struct fwu_mdata_ops *ops = device_get_ops(dev); > + > + if (!ops->get_mdata) { > + log_debug("get_mdata() method not defined\n"); > + return -ENOSYS; > + } > + > + return ops->get_mdata(dev, mdata); > +} > + > +/** > + * fwu_update_mdata() - Update the FWU metadata > + * @dev: FWU metadata device > + * @mdata: Copy of the FWU metadata > + * > + * Update the FWU metadata structure by writing to the > + * FWU metadata partitions. > + * > + * Note: This function is not to be called directly to update the > + * metadata fields. The sequence of function calls should be > + * 1) fwu_get_mdata() 2) Modify the medata fields 3) fwu_update_mdata() > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_update_mdata(struct udevice *dev, struct fwu_mdata *mdata) > +{ > + void *buf; > + const struct fwu_mdata_ops *ops = device_get_ops(dev); > + > + if (!ops->update_mdata) { > + log_debug("get_mdata() method not defined\n"); > + return -ENOSYS; > + } > + > + /* > + * Calculate the crc32 for the updated FWU metadata > + * and put the updated value in the FWU metadata crc32 > + * field > + */ > + buf = &mdata->version; > + mdata->crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32)); > + > + return ops->update_mdata(dev, mdata); > +} > + > +UCLASS_DRIVER(fwu_mdata) = { > + .id = UCLASS_FWU_MDATA, > + .name = "fwu-mdata", > +}; > diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h > index a432e43871..598a8c10a0 100644 > --- a/include/dm/uclass-id.h > +++ b/include/dm/uclass-id.h > @@ -58,6 +58,7 @@ enum uclass_id { > UCLASS_FIRMWARE, /* Firmware */ > UCLASS_FUZZING_ENGINE, /* Fuzzing engine */ > UCLASS_FS_FIRMWARE_LOADER, /* Generic loader */ > + UCLASS_FWU_MDATA, /* FWU Metadata Access */ > UCLASS_GPIO, /* Bank of general-purpose I/O pins */ > UCLASS_HASH, /* Hash device */ > UCLASS_HWSPINLOCK, /* Hardware semaphores */ > diff --git a/include/fwu.h b/include/fwu.h > new file mode 100644 > index 0000000000..a4d2d35d9a > --- /dev/null > +++ b/include/fwu.h > @@ -0,0 +1,211 @@ > +/* SPDX-License-Identifier: GPL-2.0-or-later */ > +/* > + * Copyright (c) 2022, Linaro Limited > + */ > + > +#if !defined _FWU_H_ > +#define _FWU_H_ > + > +#include <blk.h> > +#include <efi.h> > + > +#include <linux/types.h> > + > +struct fwu_mdata; > +struct udevice; > + > +/** > + * @mdata_check: check the validity of the FWU metadata partitions > + * @get_mdata() - Get a FWU metadata copy > + * @update_mdata() - Update the FWU metadata copy > + */ > +struct fwu_mdata_ops { > + /** > + * check_mdata() - Check if the FWU metadata is valid > + * @dev: FWU device > + * > + * Validate both copies of the FWU metadata. If one of the copies > + * has gone bad, restore it from the other copy. > + * > + * Return: 0 if OK, -ve on error > + */ > + int (*check_mdata)(struct udevice *dev); > + > + /** > + * get_mdata() - Get a FWU metadata copy > + * @dev: FWU device > + * @mdata: Pointer to FWU metadata > + * > + * Get a valid copy of the FWU metadata. > + * > + * Return: 0 if OK, -ve on error > + */ > + int (*get_mdata)(struct udevice *dev, struct fwu_mdata *mdata); > + > + /** > + * update_mdata() - Update the FWU metadata > + * @dev: FWU device > + * @mdata: Copy of the FWU metadata > + * > + * Update the FWU metadata structure by writing to the > + * FWU metadata partitions. > + * > + * Return: 0 if OK, -ve on error > + */ > + int (*update_mdata)(struct udevice *dev, struct fwu_mdata *mdata); > +}; > + > +#define FWU_MDATA_VERSION 0x1 > + > +/* > +* GUID value defined in the FWU specification for identification > +* of the FWU metadata partition. > +*/ > +#define FWU_MDATA_GUID \ > + EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \ > + 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23) > + > +/** > + * fwu_get_mdata() - Get a FWU metadata copy > + * @dev: FWU metadata device > + * @mdata: Copy of the FWU metadata > + * > + * Get a valid copy of the FWU metadata. > + * > + * Note: This function is to be called first when modifying any fields > + * in the metadata. The sequence of calls to modify any field in the > + * metadata would be 1) fwu_get_mdata 2) Modify metadata, followed by > + * 3) fwu_update_mdata > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_get_mdata(struct udevice *dev, struct fwu_mdata *mdata); > + > +/** > + * fwu_update_mdata() - Update the FWU metadata > + * @dev: FWU metadata device > + * @mdata: Copy of the FWU metadata > + * > + * Update the FWU metadata structure by writing to the > + * FWU metadata partitions. > + * > + * Note: This function is not to be called directly to update the > + * metadata fields. The sequence of function calls should be > + * 1) fwu_get_mdata() 2) Modify the medata fields 3) fwu_update_mdata() > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_update_mdata(struct udevice *dev, struct fwu_mdata *mdata); > + > +/** > + * fwu_get_active_index() - Get active_index from the FWU metadata > + * @active_idxp: active_index value to be read > + * > + * Read the active_index field from the FWU metadata and place it in > + * the variable pointed to be the function argument. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_get_active_index(uint *active_idxp); > + > +/** > + * fwu_set_active_index() - Set active_index in the FWU metadata > + * @active_idx: active_index value to be set > + * > + * Update the active_index field in the FWU metadata > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_set_active_index(uint active_idx); > + > +/** > + * fwu_get_image_index() - Get the Image Index to be used for capsule update > + * @image_index: The Image Index for the image > + * > + * The FWU multi bank update feature computes the value of image_index at > + * runtime, based on the bank to which the image needs to be written to. > + * Derive the image_index value for the image. > + * > + * Currently, the capsule update driver uses the DFU framework for > + * the updates. This function gets the DFU alt number which is to > + * be used as the Image Index > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_get_image_index(u8 *image_index); > + > +/** > + * fwu_mdata_check() - Check if the FWU metadata is valid > + * @dev: FWU metadata device > + * > + * Validate both copies of the FWU metadata. If one of the copies > + * has gone bad, restore it from the other copy. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_mdata_check(struct udevice *dev); > + > +/** > + * fwu_revert_boot_index() - Revert the active index in the FWU metadata > + * > + * Revert the active_index value in the FWU metadata, by swapping the values > + * of active_index and previous_active_index in both copies of the > + * FWU metadata. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_revert_boot_index(void); > + > +/** > + * fwu_verify_mdata() - Verify the FWU metadata > + * @mdata: FWU metadata structure > + * @pri_part: FWU metadata partition is primary or secondary > + * > + * Verify the FWU metadata by computing the CRC32 for the metadata > + * structure and comparing it against the CRC32 value stored as part > + * of the structure. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_verify_mdata(struct fwu_mdata *mdata, bool pri_part); > + > +/** > + * fwu_accept_image() - Set the Acceptance bit for the image > + * @img_type_id: GUID of the image type for which the accepted bit is to be > + * cleared > + * @bank: Bank of which the image's Accept bit is to be set > + * > + * Set the accepted bit for the image specified by the img_guid parameter. This > + * indicates acceptance of image for subsequent boots by some governing component > + * like OS(or firmware). > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_accept_image(efi_guid_t *img_type_id, u32 bank); > + > +/** > + * fwu_clear_accept_image() - Clear the Acceptance bit for the image > + * @img_type_id: GUID of the image type for which the accepted bit is to be > + * cleared > + * @bank: Bank of which the image's Accept bit is to be cleared > + * > + * Clear the accepted bit for the image type specified by the img_type_id parameter. > + * This function is called after the image has been updated. The accepted bit is > + * cleared to be set subsequently after passing the image acceptance criteria, by > + * either the OS(or firmware) > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank); > + > +#endif /* _FWU_H_ */ > diff --git a/include/fwu_mdata.h b/include/fwu_mdata.h > new file mode 100644 > index 0000000000..8fda4f4ac2 > --- /dev/null > +++ b/include/fwu_mdata.h > @@ -0,0 +1,67 @@ > +/* SPDX-License-Identifier: GPL-2.0-or-later */ > +/* > + * Copyright (c) 2022, Linaro Limited > + */ > + > +#if !defined _FWU_MDATA_H_ > +#define _FWU_MDATA_H_ > + > +#include <efi.h> > + > +/** > + * struct fwu_image_bank_info - firmware image information > + * @image_uuid: Guid value of the image in this bank > + * @accepted: Acceptance status of the image > + * @reserved: Reserved > + * > + * The structure contains image specific fields which are > + * used to identify the image and to specify the image's > + * acceptance status > + */ > +struct fwu_image_bank_info { > + efi_guid_t image_uuid; > + uint32_t accepted; > + uint32_t reserved; > +}; > + > +/** > + * struct fwu_image_entry - information for a particular type of image > + * @image_type_uuid: Guid value for identifying the image type > + * @location_uuid: Guid of the storage volume where the image is located > + * @img_bank_info: Array containing properties of images > + * > + * This structure contains information on various types of updatable > + * firmware images. Each image type then contains an array of image > + * information per bank. > + */ > +struct fwu_image_entry { > + efi_guid_t image_type_uuid; > + efi_guid_t location_uuid; > + struct fwu_image_bank_info img_bank_info[CONFIG_FWU_NUM_BANKS]; > +}; > + > +/** > + * struct fwu_mdata - FWU metadata structure for multi-bank updates > + * @crc32: crc32 value for the FWU metadata > + * @version: FWU metadata version > + * @active_index: Index of the bank currently used for booting images > + * @previous_active_inde: Index of the bank used before the current bank > + * being used for booting > + * @img_entry: Array of information on various firmware images that can > + * be updated > + * > + * This structure is used to store all the needed information for performing > + * multi bank updates on the platform. This contains info on the bank being > + * used to boot along with the information needed for identification of > + * individual images > + */ > +struct fwu_mdata { > + uint32_t crc32; > + uint32_t version; > + uint32_t active_index; > + uint32_t previous_active_index; > + > + struct fwu_image_entry img_entry[CONFIG_FWU_NUM_IMAGES_PER_BANK]; > +}; > + > +#endif /* _FWU_MDATA_H_ */ > diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c > new file mode 100644 > index 0000000000..fe8058bc37 > --- /dev/null > +++ b/lib/fwu_updates/fwu.c > @@ -0,0 +1,363 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright (c) 2022, Linaro Limited > + */ > + > +#include <dm.h> > +#include <efi_loader.h> > +#include <fwu.h> > +#include <fwu_mdata.h> > +#include <log.h> > + > +#include <linux/errno.h> > +#include <linux/types.h> > +#include <u-boot/crc.h> > + > +#define IMAGE_ACCEPT_SET BIT(0) > +#define IMAGE_ACCEPT_CLEAR BIT(1) Nitpicking: i think an enumerated type would be better here. (not a strong opinion) > + > +static int fwu_get_dev_mdata(struct udevice **dev, struct fwu_mdata *mdata) > + Remove this empty line. > +{ > + int ret; > + > + ret = uclass_first_device(UCLASS_FWU_MDATA, dev); > + if (ret) { > + log_debug("Cannot find fwu device\n"); > + return ret; > + } `uclass_first_device()` returns 0 when node is not found but no issue reported while parsing the FDT (learned by experience :(. In that case, *dev is set to NULL and next instruction segfaults. Proposal: ret = uclass_first_device(UCLASS_FWU_MDATA, dev); - if (ret) { + if (ret || !*dev) { log_debug("Cannot find fwu device\n"); + if (!ret) + ret = -ENOENT; return ret; } > + > + ret = fwu_get_mdata(*dev, mdata); > + if (ret < 0) > + log_debug("Unable to get valid FWU metadata\n"); > + > + return ret; > +} > + > +static int fwu_get_image_type_id(u8 *image_index, efi_guid_t *image_type_id) > +{ > + u8 index; > + int i; > + struct efi_fw_image *image; > + > + index = *image_index; > + image = update_info.images; > + for (i = 0; i < num_image_type_guids; i++) { > + if (index == image[i].image_index) { > + guidcpy(image_type_id, &image[i].image_type_id); > + return 0; > + } > + } > + > + return -ENOENT; > +} > + > +/** > + * fwu_verify_mdata() - Verify the FWU metadata > + * @mdata: FWU metadata structure > + * @pri_part: FWU metadata partition is primary or secondary > + * > + * Verify the FWU metadata by computing the CRC32 for the metadata > + * structure and comparing it against the CRC32 value stored as part > + * of the structure. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_verify_mdata(struct fwu_mdata *mdata, bool pri_part) > +{ > + u32 calc_crc32; > + void *buf; > + > + buf = &mdata->version; > + calc_crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32)); > + > + if (calc_crc32 != mdata->crc32) { > + log_debug("crc32 check failed for %s FWU metadata partition\n", > + pri_part ? "primary" : "secondary"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +/** > + * fwu_get_active_index() - Get active_index from the FWU metadata > + * @active_idx: active_index value to be read > + * > + * Read the active_index field from the FWU metadata and place it in > + * the variable pointed to be the function argument. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_get_active_index(uint *active_idx) > +{ > + int ret; > + struct udevice *dev; > + struct fwu_mdata mdata = { 0 }; > + > + ret = fwu_get_dev_mdata(&dev, &mdata); > + if (ret) > + return ret; > + > + /* > + * Found the FWU metadata partition, now read the active_index > + * value > + */ > + *active_idx = mdata.active_index; > + if (*active_idx >= CONFIG_FWU_NUM_BANKS) { > + log_debug("Active index value read is incorrect\n"); > + ret = -EINVAL; > + } > + > + return ret; > +} > + > +/** > + * fwu_set_active_index() - Set active_index in the FWU metadata > + * @active_idx: active_index value to be set > + * > + * Update the active_index field in the FWU metadata > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_set_active_index(uint active_idx) > +{ > + int ret; > + struct udevice *dev; > + struct fwu_mdata mdata = { 0 }; > + > + if (active_idx >= CONFIG_FWU_NUM_BANKS) { > + log_debug("Invalid active index value\n"); > + return -EINVAL; > + } > + > + ret = fwu_get_dev_mdata(&dev, &mdata); > + if (ret) > + return ret; > + > + /* > + * Update the active index and previous_active_index fields > + * in the FWU metadata > + */ > + mdata.previous_active_index = mdata.active_index; > + mdata.active_index = active_idx; > + > + /* > + * Now write this updated FWU metadata to both the > + * FWU metadata partitions > + */ > + ret = fwu_update_mdata(dev, &mdata); > + if (ret < 0) { Function description says it returns 0 on success so prefer here 'if (ret)'. > + log_debug("Failed to update FWU metadata partitions\n"); > + ret = -EIO; > + } > + > + return ret; > +} > + > +/** > + * fwu_get_image_index() - Get the Image Index to be used for capsule update > + * @image_index: The Image Index for the image > + * > + * The FWU multi bank update feature computes the value of image_index at > + * runtime, based on the bank to which the image needs to be written to. > + * Derive the image_index value for the image. > + * > + * Currently, the capsule update driver uses the DFU framework for > + * the updates. This function gets the DFU alt number which is to > + * be used as the Image Index > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_get_image_index(u8 *image_index) > +{ > + int ret, i; > + u8 alt_num; > + u32 update_bank; > + efi_guid_t *image_guid, image_type_id; > + struct udevice *dev; > + struct fwu_mdata mdata = { 0 }; > + struct fwu_image_entry *img_entry; > + struct fwu_image_bank_info *img_bank_info; > + > + ret = fwu_get_dev_mdata(&dev, &mdata); > + if (ret) > + return ret; > + > + ret = fwu_plat_get_update_index(&update_bank); > + if (ret) { > + log_debug("Failed to get the FWU update bank\n"); > + goto out; > + } > + > + ret = fwu_get_image_type_id(image_index, &image_type_id); > + if (ret) { > + log_debug("Unable to get image_type_id for image_index %u\n", > + *image_index); > + goto out; > + } > + > + ret = -EINVAL; > + /* > + * The FWU metadata has been read. Now get the image_uuid for the > + * image with the update_bank. > + */ > + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { > + if (!guidcmp(&image_type_id, > + &mdata.img_entry[i].image_type_uuid)) { > + img_entry = &mdata.img_entry[i]; > + img_bank_info = &img_entry->img_bank_info[update_bank]; > + image_guid = &img_bank_info->image_uuid; > + ret = fwu_plat_get_alt_num(dev, image_guid, &alt_num); > + if (ret) { > + log_debug("alt_num not found for partition with GUID %pUs\n", > + image_guid); > + } else { > + log_debug("alt_num %d for partition %pUs\n", > + alt_num, image_guid); > + *image_index = alt_num + 1; > + } > + > + goto out; > + } > + } > + > + log_debug("Partition with the image type %pUs not found\n", > + &image_type_id); > + > +out: > + return ret; > +} > + > +/** > + * fwu_revert_boot_index() - Revert the active index in the FWU metadata > + * > + * Revert the active_index value in the FWU metadata, by swapping the values > + * of active_index and previous_active_index in both copies of the > + * FWU metadata. > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_revert_boot_index(void) > +{ > + int ret; > + u32 cur_active_index; > + struct udevice *dev; > + struct fwu_mdata mdata = { 0 }; > + > + ret = fwu_get_dev_mdata(&dev, &mdata); > + if (ret) > + return ret; > + > + /* > + * Swap the active index and previous_active_index fields > + * in the FWU metadata > + */ > + cur_active_index = mdata.active_index; > + mdata.active_index = mdata.previous_active_index; > + mdata.previous_active_index = cur_active_index; > + > + /* > + * Now write this updated FWU metadata to both the > + * FWU metadata partitions > + */ > + ret = fwu_update_mdata(dev, &mdata); > + if (ret < 0) { Same comment here: error case should be trapped with 'if (ret)'. br, etienne > + log_debug("Failed to update FWU metadata partitions\n"); > + ret = -EIO; > + } > + > + return ret; > +} > + > +/** > + * fwu_clrset_image_accept() - Set or Clear the Acceptance bit for the image > + * @img_type_id: GUID of the image type for which the accepted bit is to be > + * set or cleared > + * @bank: Bank of which the image's Accept bit is to be set or cleared > + * @action: Action which specifies whether image's Accept bit is to be set or > + * cleared > + * > + * Set/Clear the accepted bit for the image specified by the img_guid parameter. > + * This indicates acceptance or rejection of image for subsequent boots by some > + * governing component like OS(or firmware). > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +static int fwu_clrset_image_accept(efi_guid_t *img_type_id, u32 bank, u8 action) > +{ > + int ret, i; > + struct udevice *dev; > + struct fwu_mdata mdata = { 0 }; > + struct fwu_image_entry *img_entry; > + struct fwu_image_bank_info *img_bank_info; > + > + ret = fwu_get_dev_mdata(&dev, &mdata); > + if (ret) > + return ret; > + > + img_entry = &mdata.img_entry[0]; > + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { > + if (!guidcmp(&img_entry[i].image_type_uuid, img_type_id)) { > + img_bank_info = &img_entry[i].img_bank_info[bank]; > + if (action == IMAGE_ACCEPT_SET) > + img_bank_info->accepted |= FWU_IMAGE_ACCEPTED; > + else > + img_bank_info->accepted = 0; > + > + ret = fwu_update_mdata(dev, &mdata); > + goto out; > + } > + } > + > + /* Image not found */ > + ret = -ENOENT; > + > +out: > + return ret; > +} > + > +/** > + * fwu_accept_image() - Set the Acceptance bit for the image > + * @img_type_id: GUID of the image type for which the accepted bit is to be > + * cleared > + * @bank: Bank of which the image's Accept bit is to be set > + * > + * Set the accepted bit for the image specified by the img_guid parameter. This > + * indicates acceptance of image for subsequent boots by some governing component > + * like OS(or firmware). > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +int fwu_accept_image(efi_guid_t *img_type_id, u32 bank) > +{ > + return fwu_clrset_image_accept(img_type_id, bank, > + IMAGE_ACCEPT_SET); > +} > + > +/** > + * fwu_clear_accept_image() - Clear the Acceptance bit for the image > + * @img_type_id: GUID of the image type for which the accepted bit is to be > + * cleared > + * @bank: Bank of which the image's Accept bit is to be cleared > + * > + * Clear the accepted bit for the image type specified by the img_type_id parameter. > + * This function is called after the image has been updated. The accepted bit is > + * cleared to be set subsequently after passing the image acceptance criteria, by > + * either the OS(or firmware) > + * > + * Return: 0 if OK, -ve on error > + * > + */ > +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); > +} > -- > 2.34.1 >
hi Etienne, On Fri, 30 Sept 2022 at 11:24, Etienne Carriere <etienne.carriere@linaro.org> wrote: > > Hello Sughosh, > > On Wed, 28 Sept 2022 at 11:30, Sughosh Ganu <sughosh.ganu@linaro.org> wrote: > > > > In the FWU Multi Bank Update feature, the information about the > > updatable images is stored as part of the metadata, which is stored on > > a dedicated partition. Add the metadata structure, and a driver model > > uclass which provides functions to access the metadata. These are > > generic API's, and implementations can be added based on parameters > > like how the metadata partition is accessed and what type of storage > > device houses the metadata. > > > > Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> > > Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com> > > Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org> > > --- > > Changes since V10: > > * s/fwu_update_active_index/fwu_set_active_index as per comment from > > Jassi > > * Change the argument type of fwu_set_active_index() to uint from u32 > > as per comment from Jassi > > * s/mdata_check/check_mdata as per comment from Jassi > > * Fix the typo in the function comment of fwu_mdata_check() > > > > drivers/fwu-mdata/fwu-mdata-uclass.c | 107 ++++++++ > > include/dm/uclass-id.h | 1 + > > include/fwu.h | 211 ++++++++++++++++ > > include/fwu_mdata.h | 67 +++++ > > lib/fwu_updates/fwu.c | 363 +++++++++++++++++++++++++++ > > 5 files changed, 749 insertions(+) > > create mode 100644 drivers/fwu-mdata/fwu-mdata-uclass.c > > create mode 100644 include/fwu.h > > create mode 100644 include/fwu_mdata.h > > create mode 100644 lib/fwu_updates/fwu.c <snip> > > diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c > > new file mode 100644 > > index 0000000000..fe8058bc37 > > --- /dev/null > > +++ b/lib/fwu_updates/fwu.c > > @@ -0,0 +1,363 @@ > > +// SPDX-License-Identifier: GPL-2.0-or-later > > +/* > > + * Copyright (c) 2022, Linaro Limited > > + */ > > + > > +#include <dm.h> > > +#include <efi_loader.h> > > +#include <fwu.h> > > +#include <fwu_mdata.h> > > +#include <log.h> > > + > > +#include <linux/errno.h> > > +#include <linux/types.h> > > +#include <u-boot/crc.h> > > + > > +#define IMAGE_ACCEPT_SET BIT(0) > > +#define IMAGE_ACCEPT_CLEAR BIT(1) > > Nitpicking: i think an enumerated type would be better here. > (not a strong opinion) Okay > > > + > > +static int fwu_get_dev_mdata(struct udevice **dev, struct fwu_mdata *mdata) > > + > > Remove this empty line. Will do > > > +{ > > + int ret; > > + > > + ret = uclass_first_device(UCLASS_FWU_MDATA, dev); > > + if (ret) { > > + log_debug("Cannot find fwu device\n"); > > + return ret; > > + } > > `uclass_first_device()` returns 0 when node is not found but no issue > reported while parsing the FDT (learned by experience :(. In that > case, *dev is set to NULL and next instruction segfaults. > Proposal: > > ret = uclass_first_device(UCLASS_FWU_MDATA, dev); > - if (ret) { > + if (ret || !*dev) { > log_debug("Cannot find fwu device\n"); > + if (!ret) > + ret = -ENOENT; > return ret; > } I think I can instead use uclass_first_device_err(). I think that is doing what you are proposing above. > > > > > + > > + ret = fwu_get_mdata(*dev, mdata); > > + if (ret < 0) > > + log_debug("Unable to get valid FWU metadata\n"); > > + > > + return ret; > > +} > > + > > +static int fwu_get_image_type_id(u8 *image_index, efi_guid_t *image_type_id) > > +{ > > + u8 index; > > + int i; > > + struct efi_fw_image *image; > > + > > + index = *image_index; > > + image = update_info.images; > > + for (i = 0; i < num_image_type_guids; i++) { > > + if (index == image[i].image_index) { > > + guidcpy(image_type_id, &image[i].image_type_id); > > + return 0; > > + } > > + } > > + > > + return -ENOENT; > > +} > > + > > +/** > > + * fwu_verify_mdata() - Verify the FWU metadata > > + * @mdata: FWU metadata structure > > + * @pri_part: FWU metadata partition is primary or secondary > > + * > > + * Verify the FWU metadata by computing the CRC32 for the metadata > > + * structure and comparing it against the CRC32 value stored as part > > + * of the structure. > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +int fwu_verify_mdata(struct fwu_mdata *mdata, bool pri_part) > > +{ > > + u32 calc_crc32; > > + void *buf; > > + > > + buf = &mdata->version; > > + calc_crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32)); > > + > > + if (calc_crc32 != mdata->crc32) { > > + log_debug("crc32 check failed for %s FWU metadata partition\n", > > + pri_part ? "primary" : "secondary"); > > + return -EINVAL; > > + } > > + > > + return 0; > > +} > > + > > +/** > > + * fwu_get_active_index() - Get active_index from the FWU metadata > > + * @active_idx: active_index value to be read > > + * > > + * Read the active_index field from the FWU metadata and place it in > > + * the variable pointed to be the function argument. > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +int fwu_get_active_index(uint *active_idx) > > +{ > > + int ret; > > + struct udevice *dev; > > + struct fwu_mdata mdata = { 0 }; > > + > > + ret = fwu_get_dev_mdata(&dev, &mdata); > > + if (ret) > > + return ret; > > + > > + /* > > + * Found the FWU metadata partition, now read the active_index > > + * value > > + */ > > + *active_idx = mdata.active_index; > > + if (*active_idx >= CONFIG_FWU_NUM_BANKS) { > > + log_debug("Active index value read is incorrect\n"); > > + ret = -EINVAL; > > + } > > + > > + return ret; > > +} > > + > > +/** > > + * fwu_set_active_index() - Set active_index in the FWU metadata > > + * @active_idx: active_index value to be set > > + * > > + * Update the active_index field in the FWU metadata > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +int fwu_set_active_index(uint active_idx) > > +{ > > + int ret; > > + struct udevice *dev; > > + struct fwu_mdata mdata = { 0 }; > > + > > + if (active_idx >= CONFIG_FWU_NUM_BANKS) { > > + log_debug("Invalid active index value\n"); > > + return -EINVAL; > > + } > > + > > + ret = fwu_get_dev_mdata(&dev, &mdata); > > + if (ret) > > + return ret; > > + > > + /* > > + * Update the active index and previous_active_index fields > > + * in the FWU metadata > > + */ > > + mdata.previous_active_index = mdata.active_index; > > + mdata.active_index = active_idx; > > + > > + /* > > + * Now write this updated FWU metadata to both the > > + * FWU metadata partitions > > + */ > > + ret = fwu_update_mdata(dev, &mdata); > > + if (ret < 0) { > > Function description says it returns 0 on success so prefer here 'if (ret)'. Okay > > > + log_debug("Failed to update FWU metadata partitions\n"); > > + ret = -EIO; > > + } > > + > > + return ret; > > +} > > + > > +/** > > + * fwu_get_image_index() - Get the Image Index to be used for capsule update > > + * @image_index: The Image Index for the image > > + * > > + * The FWU multi bank update feature computes the value of image_index at > > + * runtime, based on the bank to which the image needs to be written to. > > + * Derive the image_index value for the image. > > + * > > + * Currently, the capsule update driver uses the DFU framework for > > + * the updates. This function gets the DFU alt number which is to > > + * be used as the Image Index > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +int fwu_get_image_index(u8 *image_index) > > +{ > > + int ret, i; > > + u8 alt_num; > > + u32 update_bank; > > + efi_guid_t *image_guid, image_type_id; > > + struct udevice *dev; > > + struct fwu_mdata mdata = { 0 }; > > + struct fwu_image_entry *img_entry; > > + struct fwu_image_bank_info *img_bank_info; > > + > > + ret = fwu_get_dev_mdata(&dev, &mdata); > > + if (ret) > > + return ret; > > + > > + ret = fwu_plat_get_update_index(&update_bank); > > + if (ret) { > > + log_debug("Failed to get the FWU update bank\n"); > > + goto out; > > + } > > + > > + ret = fwu_get_image_type_id(image_index, &image_type_id); > > + if (ret) { > > + log_debug("Unable to get image_type_id for image_index %u\n", > > + *image_index); > > + goto out; > > + } > > + > > + ret = -EINVAL; > > + /* > > + * The FWU metadata has been read. Now get the image_uuid for the > > + * image with the update_bank. > > + */ > > + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { > > + if (!guidcmp(&image_type_id, > > + &mdata.img_entry[i].image_type_uuid)) { > > + img_entry = &mdata.img_entry[i]; > > + img_bank_info = &img_entry->img_bank_info[update_bank]; > > + image_guid = &img_bank_info->image_uuid; > > + ret = fwu_plat_get_alt_num(dev, image_guid, &alt_num); > > + if (ret) { > > + log_debug("alt_num not found for partition with GUID %pUs\n", > > + image_guid); > > + } else { > > + log_debug("alt_num %d for partition %pUs\n", > > + alt_num, image_guid); > > + *image_index = alt_num + 1; > > + } > > + > > + goto out; > > + } > > + } > > + > > + log_debug("Partition with the image type %pUs not found\n", > > + &image_type_id); > > + > > +out: > > + return ret; > > +} > > + > > +/** > > + * fwu_revert_boot_index() - Revert the active index in the FWU metadata > > + * > > + * Revert the active_index value in the FWU metadata, by swapping the values > > + * of active_index and previous_active_index in both copies of the > > + * FWU metadata. > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +int fwu_revert_boot_index(void) > > +{ > > + int ret; > > + u32 cur_active_index; > > + struct udevice *dev; > > + struct fwu_mdata mdata = { 0 }; > > + > > + ret = fwu_get_dev_mdata(&dev, &mdata); > > + if (ret) > > + return ret; > > + > > + /* > > + * Swap the active index and previous_active_index fields > > + * in the FWU metadata > > + */ > > + cur_active_index = mdata.active_index; > > + mdata.active_index = mdata.previous_active_index; > > + mdata.previous_active_index = cur_active_index; > > + > > + /* > > + * Now write this updated FWU metadata to both the > > + * FWU metadata partitions > > + */ > > + ret = fwu_update_mdata(dev, &mdata); > > + if (ret < 0) { > > Same comment here: error case should be trapped with 'if (ret)'. Okay -sughosh > > br, > etienne > > > + log_debug("Failed to update FWU metadata partitions\n"); > > + ret = -EIO; > > + } > > + > > + return ret; > > +} > > + > > +/** > > + * fwu_clrset_image_accept() - Set or Clear the Acceptance bit for the image > > + * @img_type_id: GUID of the image type for which the accepted bit is to be > > + * set or cleared > > + * @bank: Bank of which the image's Accept bit is to be set or cleared > > + * @action: Action which specifies whether image's Accept bit is to be set or > > + * cleared > > + * > > + * Set/Clear the accepted bit for the image specified by the img_guid parameter. > > + * This indicates acceptance or rejection of image for subsequent boots by some > > + * governing component like OS(or firmware). > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +static int fwu_clrset_image_accept(efi_guid_t *img_type_id, u32 bank, u8 action) > > +{ > > + int ret, i; > > + struct udevice *dev; > > + struct fwu_mdata mdata = { 0 }; > > + struct fwu_image_entry *img_entry; > > + struct fwu_image_bank_info *img_bank_info; > > + > > + ret = fwu_get_dev_mdata(&dev, &mdata); > > + if (ret) > > + return ret; > > + > > + img_entry = &mdata.img_entry[0]; > > + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { > > + if (!guidcmp(&img_entry[i].image_type_uuid, img_type_id)) { > > + img_bank_info = &img_entry[i].img_bank_info[bank]; > > + if (action == IMAGE_ACCEPT_SET) > > + img_bank_info->accepted |= FWU_IMAGE_ACCEPTED; > > + else > > + img_bank_info->accepted = 0; > > + > > + ret = fwu_update_mdata(dev, &mdata); > > + goto out; > > + } > > + } > > + > > + /* Image not found */ > > + ret = -ENOENT; > > + > > +out: > > + return ret; > > +} > > + > > +/** > > + * fwu_accept_image() - Set the Acceptance bit for the image > > + * @img_type_id: GUID of the image type for which the accepted bit is to be > > + * cleared > > + * @bank: Bank of which the image's Accept bit is to be set > > + * > > + * Set the accepted bit for the image specified by the img_guid parameter. This > > + * indicates acceptance of image for subsequent boots by some governing component > > + * like OS(or firmware). > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +int fwu_accept_image(efi_guid_t *img_type_id, u32 bank) > > +{ > > + return fwu_clrset_image_accept(img_type_id, bank, > > + IMAGE_ACCEPT_SET); > > +} > > + > > +/** > > + * fwu_clear_accept_image() - Clear the Acceptance bit for the image > > + * @img_type_id: GUID of the image type for which the accepted bit is to be > > + * cleared > > + * @bank: Bank of which the image's Accept bit is to be cleared > > + * > > + * Clear the accepted bit for the image type specified by the img_type_id parameter. > > + * This function is called after the image has been updated. The accepted bit is > > + * cleared to be set subsequently after passing the image acceptance criteria, by > > + * either the OS(or firmware) > > + * > > + * Return: 0 if OK, -ve on error > > + * > > + */ > > +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); > > +} > > -- > > 2.34.1 > >
diff --git a/drivers/fwu-mdata/fwu-mdata-uclass.c b/drivers/fwu-mdata/fwu-mdata-uclass.c new file mode 100644 index 0000000000..4237b89520 --- /dev/null +++ b/drivers/fwu-mdata/fwu-mdata-uclass.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2022, Linaro Limited + */ + +#define LOG_CATEGORY UCLASS_FWU_MDATA + +#include <common.h> +#include <dm.h> +#include <efi_loader.h> +#include <fwu.h> +#include <fwu_mdata.h> +#include <log.h> + +#include <linux/errno.h> +#include <linux/types.h> +#include <u-boot/crc.h> + +/** + * fwu_mdata_check() - Check if the FWU metadata is valid + * @dev: FWU metadata device + * + * Validate both copies of the FWU metadata. If one of the copies + * has gone bad, restore it from the other copy. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_mdata_check(struct udevice *dev) +{ + const struct fwu_mdata_ops *ops = device_get_ops(dev); + + if (!ops->check_mdata) { + log_debug("check_mdata() method not defined\n"); + return -ENOSYS; + } + + return ops->check_mdata(dev); +} + +/** + * fwu_get_mdata() - Get a FWU metadata copy + * @dev: FWU metadata device + * @mdata: Copy of the FWU metadata + * + * Get a valid copy of the FWU metadata. + * + * Note: This function is to be called first when modifying any fields + * in the metadata. The sequence of calls to modify any field in the + * metadata would be 1) fwu_get_mdata 2) Modify metadata, followed by + * 3) fwu_update_mdata + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_get_mdata(struct udevice *dev, struct fwu_mdata *mdata) +{ + const struct fwu_mdata_ops *ops = device_get_ops(dev); + + if (!ops->get_mdata) { + log_debug("get_mdata() method not defined\n"); + return -ENOSYS; + } + + return ops->get_mdata(dev, mdata); +} + +/** + * fwu_update_mdata() - Update the FWU metadata + * @dev: FWU metadata device + * @mdata: Copy of the FWU metadata + * + * Update the FWU metadata structure by writing to the + * FWU metadata partitions. + * + * Note: This function is not to be called directly to update the + * metadata fields. The sequence of function calls should be + * 1) fwu_get_mdata() 2) Modify the medata fields 3) fwu_update_mdata() + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_update_mdata(struct udevice *dev, struct fwu_mdata *mdata) +{ + void *buf; + const struct fwu_mdata_ops *ops = device_get_ops(dev); + + if (!ops->update_mdata) { + log_debug("get_mdata() method not defined\n"); + return -ENOSYS; + } + + /* + * Calculate the crc32 for the updated FWU metadata + * and put the updated value in the FWU metadata crc32 + * field + */ + buf = &mdata->version; + mdata->crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32)); + + return ops->update_mdata(dev, mdata); +} + +UCLASS_DRIVER(fwu_mdata) = { + .id = UCLASS_FWU_MDATA, + .name = "fwu-mdata", +}; diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index a432e43871..598a8c10a0 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -58,6 +58,7 @@ enum uclass_id { UCLASS_FIRMWARE, /* Firmware */ UCLASS_FUZZING_ENGINE, /* Fuzzing engine */ UCLASS_FS_FIRMWARE_LOADER, /* Generic loader */ + UCLASS_FWU_MDATA, /* FWU Metadata Access */ UCLASS_GPIO, /* Bank of general-purpose I/O pins */ UCLASS_HASH, /* Hash device */ UCLASS_HWSPINLOCK, /* Hardware semaphores */ diff --git a/include/fwu.h b/include/fwu.h new file mode 100644 index 0000000000..a4d2d35d9a --- /dev/null +++ b/include/fwu.h @@ -0,0 +1,211 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 2022, Linaro Limited + */ + +#if !defined _FWU_H_ +#define _FWU_H_ + +#include <blk.h> +#include <efi.h> + +#include <linux/types.h> + +struct fwu_mdata; +struct udevice; + +/** + * @mdata_check: check the validity of the FWU metadata partitions + * @get_mdata() - Get a FWU metadata copy + * @update_mdata() - Update the FWU metadata copy + */ +struct fwu_mdata_ops { + /** + * check_mdata() - Check if the FWU metadata is valid + * @dev: FWU device + * + * Validate both copies of the FWU metadata. If one of the copies + * has gone bad, restore it from the other copy. + * + * Return: 0 if OK, -ve on error + */ + int (*check_mdata)(struct udevice *dev); + + /** + * get_mdata() - Get a FWU metadata copy + * @dev: FWU device + * @mdata: Pointer to FWU metadata + * + * Get a valid copy of the FWU metadata. + * + * Return: 0 if OK, -ve on error + */ + int (*get_mdata)(struct udevice *dev, struct fwu_mdata *mdata); + + /** + * update_mdata() - Update the FWU metadata + * @dev: FWU device + * @mdata: Copy of the FWU metadata + * + * Update the FWU metadata structure by writing to the + * FWU metadata partitions. + * + * Return: 0 if OK, -ve on error + */ + int (*update_mdata)(struct udevice *dev, struct fwu_mdata *mdata); +}; + +#define FWU_MDATA_VERSION 0x1 + +/* +* GUID value defined in the FWU specification for identification +* of the FWU metadata partition. +*/ +#define FWU_MDATA_GUID \ + EFI_GUID(0x8a7a84a0, 0x8387, 0x40f6, 0xab, 0x41, \ + 0xa8, 0xb9, 0xa5, 0xa6, 0x0d, 0x23) + +/** + * fwu_get_mdata() - Get a FWU metadata copy + * @dev: FWU metadata device + * @mdata: Copy of the FWU metadata + * + * Get a valid copy of the FWU metadata. + * + * Note: This function is to be called first when modifying any fields + * in the metadata. The sequence of calls to modify any field in the + * metadata would be 1) fwu_get_mdata 2) Modify metadata, followed by + * 3) fwu_update_mdata + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_get_mdata(struct udevice *dev, struct fwu_mdata *mdata); + +/** + * fwu_update_mdata() - Update the FWU metadata + * @dev: FWU metadata device + * @mdata: Copy of the FWU metadata + * + * Update the FWU metadata structure by writing to the + * FWU metadata partitions. + * + * Note: This function is not to be called directly to update the + * metadata fields. The sequence of function calls should be + * 1) fwu_get_mdata() 2) Modify the medata fields 3) fwu_update_mdata() + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_update_mdata(struct udevice *dev, struct fwu_mdata *mdata); + +/** + * fwu_get_active_index() - Get active_index from the FWU metadata + * @active_idxp: active_index value to be read + * + * Read the active_index field from the FWU metadata and place it in + * the variable pointed to be the function argument. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_get_active_index(uint *active_idxp); + +/** + * fwu_set_active_index() - Set active_index in the FWU metadata + * @active_idx: active_index value to be set + * + * Update the active_index field in the FWU metadata + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_set_active_index(uint active_idx); + +/** + * fwu_get_image_index() - Get the Image Index to be used for capsule update + * @image_index: The Image Index for the image + * + * The FWU multi bank update feature computes the value of image_index at + * runtime, based on the bank to which the image needs to be written to. + * Derive the image_index value for the image. + * + * Currently, the capsule update driver uses the DFU framework for + * the updates. This function gets the DFU alt number which is to + * be used as the Image Index + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_get_image_index(u8 *image_index); + +/** + * fwu_mdata_check() - Check if the FWU metadata is valid + * @dev: FWU metadata device + * + * Validate both copies of the FWU metadata. If one of the copies + * has gone bad, restore it from the other copy. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_mdata_check(struct udevice *dev); + +/** + * fwu_revert_boot_index() - Revert the active index in the FWU metadata + * + * Revert the active_index value in the FWU metadata, by swapping the values + * of active_index and previous_active_index in both copies of the + * FWU metadata. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_revert_boot_index(void); + +/** + * fwu_verify_mdata() - Verify the FWU metadata + * @mdata: FWU metadata structure + * @pri_part: FWU metadata partition is primary or secondary + * + * Verify the FWU metadata by computing the CRC32 for the metadata + * structure and comparing it against the CRC32 value stored as part + * of the structure. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_verify_mdata(struct fwu_mdata *mdata, bool pri_part); + +/** + * fwu_accept_image() - Set the Acceptance bit for the image + * @img_type_id: GUID of the image type for which the accepted bit is to be + * cleared + * @bank: Bank of which the image's Accept bit is to be set + * + * Set the accepted bit for the image specified by the img_guid parameter. This + * indicates acceptance of image for subsequent boots by some governing component + * like OS(or firmware). + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_accept_image(efi_guid_t *img_type_id, u32 bank); + +/** + * fwu_clear_accept_image() - Clear the Acceptance bit for the image + * @img_type_id: GUID of the image type for which the accepted bit is to be + * cleared + * @bank: Bank of which the image's Accept bit is to be cleared + * + * Clear the accepted bit for the image type specified by the img_type_id parameter. + * This function is called after the image has been updated. The accepted bit is + * cleared to be set subsequently after passing the image acceptance criteria, by + * either the OS(or firmware) + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_clear_accept_image(efi_guid_t *img_type_id, u32 bank); + +#endif /* _FWU_H_ */ diff --git a/include/fwu_mdata.h b/include/fwu_mdata.h new file mode 100644 index 0000000000..8fda4f4ac2 --- /dev/null +++ b/include/fwu_mdata.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 2022, Linaro Limited + */ + +#if !defined _FWU_MDATA_H_ +#define _FWU_MDATA_H_ + +#include <efi.h> + +/** + * struct fwu_image_bank_info - firmware image information + * @image_uuid: Guid value of the image in this bank + * @accepted: Acceptance status of the image + * @reserved: Reserved + * + * The structure contains image specific fields which are + * used to identify the image and to specify the image's + * acceptance status + */ +struct fwu_image_bank_info { + efi_guid_t image_uuid; + uint32_t accepted; + uint32_t reserved; +}; + +/** + * struct fwu_image_entry - information for a particular type of image + * @image_type_uuid: Guid value for identifying the image type + * @location_uuid: Guid of the storage volume where the image is located + * @img_bank_info: Array containing properties of images + * + * This structure contains information on various types of updatable + * firmware images. Each image type then contains an array of image + * information per bank. + */ +struct fwu_image_entry { + efi_guid_t image_type_uuid; + efi_guid_t location_uuid; + struct fwu_image_bank_info img_bank_info[CONFIG_FWU_NUM_BANKS]; +}; + +/** + * struct fwu_mdata - FWU metadata structure for multi-bank updates + * @crc32: crc32 value for the FWU metadata + * @version: FWU metadata version + * @active_index: Index of the bank currently used for booting images + * @previous_active_inde: Index of the bank used before the current bank + * being used for booting + * @img_entry: Array of information on various firmware images that can + * be updated + * + * This structure is used to store all the needed information for performing + * multi bank updates on the platform. This contains info on the bank being + * used to boot along with the information needed for identification of + * individual images + */ +struct fwu_mdata { + uint32_t crc32; + uint32_t version; + uint32_t active_index; + uint32_t previous_active_index; + + struct fwu_image_entry img_entry[CONFIG_FWU_NUM_IMAGES_PER_BANK]; +}; + +#endif /* _FWU_MDATA_H_ */ diff --git a/lib/fwu_updates/fwu.c b/lib/fwu_updates/fwu.c new file mode 100644 index 0000000000..fe8058bc37 --- /dev/null +++ b/lib/fwu_updates/fwu.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2022, Linaro Limited + */ + +#include <dm.h> +#include <efi_loader.h> +#include <fwu.h> +#include <fwu_mdata.h> +#include <log.h> + +#include <linux/errno.h> +#include <linux/types.h> +#include <u-boot/crc.h> + +#define IMAGE_ACCEPT_SET BIT(0) +#define IMAGE_ACCEPT_CLEAR BIT(1) + +static int fwu_get_dev_mdata(struct udevice **dev, struct fwu_mdata *mdata) + +{ + int ret; + + ret = uclass_first_device(UCLASS_FWU_MDATA, dev); + if (ret) { + log_debug("Cannot find fwu device\n"); + return ret; + } + + ret = fwu_get_mdata(*dev, mdata); + if (ret < 0) + log_debug("Unable to get valid FWU metadata\n"); + + return ret; +} + +static int fwu_get_image_type_id(u8 *image_index, efi_guid_t *image_type_id) +{ + u8 index; + int i; + struct efi_fw_image *image; + + index = *image_index; + image = update_info.images; + for (i = 0; i < num_image_type_guids; i++) { + if (index == image[i].image_index) { + guidcpy(image_type_id, &image[i].image_type_id); + return 0; + } + } + + return -ENOENT; +} + +/** + * fwu_verify_mdata() - Verify the FWU metadata + * @mdata: FWU metadata structure + * @pri_part: FWU metadata partition is primary or secondary + * + * Verify the FWU metadata by computing the CRC32 for the metadata + * structure and comparing it against the CRC32 value stored as part + * of the structure. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_verify_mdata(struct fwu_mdata *mdata, bool pri_part) +{ + u32 calc_crc32; + void *buf; + + buf = &mdata->version; + calc_crc32 = crc32(0, buf, sizeof(*mdata) - sizeof(u32)); + + if (calc_crc32 != mdata->crc32) { + log_debug("crc32 check failed for %s FWU metadata partition\n", + pri_part ? "primary" : "secondary"); + return -EINVAL; + } + + return 0; +} + +/** + * fwu_get_active_index() - Get active_index from the FWU metadata + * @active_idx: active_index value to be read + * + * Read the active_index field from the FWU metadata and place it in + * the variable pointed to be the function argument. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_get_active_index(uint *active_idx) +{ + int ret; + struct udevice *dev; + struct fwu_mdata mdata = { 0 }; + + ret = fwu_get_dev_mdata(&dev, &mdata); + if (ret) + return ret; + + /* + * Found the FWU metadata partition, now read the active_index + * value + */ + *active_idx = mdata.active_index; + if (*active_idx >= CONFIG_FWU_NUM_BANKS) { + log_debug("Active index value read is incorrect\n"); + ret = -EINVAL; + } + + return ret; +} + +/** + * fwu_set_active_index() - Set active_index in the FWU metadata + * @active_idx: active_index value to be set + * + * Update the active_index field in the FWU metadata + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_set_active_index(uint active_idx) +{ + int ret; + struct udevice *dev; + struct fwu_mdata mdata = { 0 }; + + if (active_idx >= CONFIG_FWU_NUM_BANKS) { + log_debug("Invalid active index value\n"); + return -EINVAL; + } + + ret = fwu_get_dev_mdata(&dev, &mdata); + if (ret) + return ret; + + /* + * Update the active index and previous_active_index fields + * in the FWU metadata + */ + mdata.previous_active_index = mdata.active_index; + mdata.active_index = active_idx; + + /* + * Now write this updated FWU metadata to both the + * FWU metadata partitions + */ + ret = fwu_update_mdata(dev, &mdata); + if (ret < 0) { + log_debug("Failed to update FWU metadata partitions\n"); + ret = -EIO; + } + + return ret; +} + +/** + * fwu_get_image_index() - Get the Image Index to be used for capsule update + * @image_index: The Image Index for the image + * + * The FWU multi bank update feature computes the value of image_index at + * runtime, based on the bank to which the image needs to be written to. + * Derive the image_index value for the image. + * + * Currently, the capsule update driver uses the DFU framework for + * the updates. This function gets the DFU alt number which is to + * be used as the Image Index + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_get_image_index(u8 *image_index) +{ + int ret, i; + u8 alt_num; + u32 update_bank; + efi_guid_t *image_guid, image_type_id; + struct udevice *dev; + struct fwu_mdata mdata = { 0 }; + struct fwu_image_entry *img_entry; + struct fwu_image_bank_info *img_bank_info; + + ret = fwu_get_dev_mdata(&dev, &mdata); + if (ret) + return ret; + + ret = fwu_plat_get_update_index(&update_bank); + if (ret) { + log_debug("Failed to get the FWU update bank\n"); + goto out; + } + + ret = fwu_get_image_type_id(image_index, &image_type_id); + if (ret) { + log_debug("Unable to get image_type_id for image_index %u\n", + *image_index); + goto out; + } + + ret = -EINVAL; + /* + * The FWU metadata has been read. Now get the image_uuid for the + * image with the update_bank. + */ + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { + if (!guidcmp(&image_type_id, + &mdata.img_entry[i].image_type_uuid)) { + img_entry = &mdata.img_entry[i]; + img_bank_info = &img_entry->img_bank_info[update_bank]; + image_guid = &img_bank_info->image_uuid; + ret = fwu_plat_get_alt_num(dev, image_guid, &alt_num); + if (ret) { + log_debug("alt_num not found for partition with GUID %pUs\n", + image_guid); + } else { + log_debug("alt_num %d for partition %pUs\n", + alt_num, image_guid); + *image_index = alt_num + 1; + } + + goto out; + } + } + + log_debug("Partition with the image type %pUs not found\n", + &image_type_id); + +out: + return ret; +} + +/** + * fwu_revert_boot_index() - Revert the active index in the FWU metadata + * + * Revert the active_index value in the FWU metadata, by swapping the values + * of active_index and previous_active_index in both copies of the + * FWU metadata. + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_revert_boot_index(void) +{ + int ret; + u32 cur_active_index; + struct udevice *dev; + struct fwu_mdata mdata = { 0 }; + + ret = fwu_get_dev_mdata(&dev, &mdata); + if (ret) + return ret; + + /* + * Swap the active index and previous_active_index fields + * in the FWU metadata + */ + cur_active_index = mdata.active_index; + mdata.active_index = mdata.previous_active_index; + mdata.previous_active_index = cur_active_index; + + /* + * Now write this updated FWU metadata to both the + * FWU metadata partitions + */ + ret = fwu_update_mdata(dev, &mdata); + if (ret < 0) { + log_debug("Failed to update FWU metadata partitions\n"); + ret = -EIO; + } + + return ret; +} + +/** + * fwu_clrset_image_accept() - Set or Clear the Acceptance bit for the image + * @img_type_id: GUID of the image type for which the accepted bit is to be + * set or cleared + * @bank: Bank of which the image's Accept bit is to be set or cleared + * @action: Action which specifies whether image's Accept bit is to be set or + * cleared + * + * Set/Clear the accepted bit for the image specified by the img_guid parameter. + * This indicates acceptance or rejection of image for subsequent boots by some + * governing component like OS(or firmware). + * + * Return: 0 if OK, -ve on error + * + */ +static int fwu_clrset_image_accept(efi_guid_t *img_type_id, u32 bank, u8 action) +{ + int ret, i; + struct udevice *dev; + struct fwu_mdata mdata = { 0 }; + struct fwu_image_entry *img_entry; + struct fwu_image_bank_info *img_bank_info; + + ret = fwu_get_dev_mdata(&dev, &mdata); + if (ret) + return ret; + + img_entry = &mdata.img_entry[0]; + for (i = 0; i < CONFIG_FWU_NUM_IMAGES_PER_BANK; i++) { + if (!guidcmp(&img_entry[i].image_type_uuid, img_type_id)) { + img_bank_info = &img_entry[i].img_bank_info[bank]; + if (action == IMAGE_ACCEPT_SET) + img_bank_info->accepted |= FWU_IMAGE_ACCEPTED; + else + img_bank_info->accepted = 0; + + ret = fwu_update_mdata(dev, &mdata); + goto out; + } + } + + /* Image not found */ + ret = -ENOENT; + +out: + return ret; +} + +/** + * fwu_accept_image() - Set the Acceptance bit for the image + * @img_type_id: GUID of the image type for which the accepted bit is to be + * cleared + * @bank: Bank of which the image's Accept bit is to be set + * + * Set the accepted bit for the image specified by the img_guid parameter. This + * indicates acceptance of image for subsequent boots by some governing component + * like OS(or firmware). + * + * Return: 0 if OK, -ve on error + * + */ +int fwu_accept_image(efi_guid_t *img_type_id, u32 bank) +{ + return fwu_clrset_image_accept(img_type_id, bank, + IMAGE_ACCEPT_SET); +} + +/** + * fwu_clear_accept_image() - Clear the Acceptance bit for the image + * @img_type_id: GUID of the image type for which the accepted bit is to be + * cleared + * @bank: Bank of which the image's Accept bit is to be cleared + * + * Clear the accepted bit for the image type specified by the img_type_id parameter. + * This function is called after the image has been updated. The accepted bit is + * cleared to be set subsequently after passing the image acceptance criteria, by + * either the OS(or firmware) + * + * Return: 0 if OK, -ve on error + * + */ +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); +}