storageproxyd: Retry RPMB request on UNIT ATTENTION am: ab2257ee48 (8934722f) · Commits · e / os / android_system_core

trusty/storage/proxy/rpmb.c

+79 −35

Original line number	Diff line number	Diff line
		@@ -57,6 +57,17 @@

		#define MMC_BLOCK_SIZE 512

		/*
		* Number of retry attempts when an RPMB authenticated write triggers a UNIT
		* ATTENTION
		*/
		#define UFS_RPMB_WRITE_RETRY_COUNT 1
		/*
		* Number of retry attempts when an RPMB read operation triggers a UNIT
		* ATTENTION
		*/
		#define UFS_RPMB_READ_RETRY_COUNT 3

		/*
		* There should be no timeout for security protocol ioctl call, so we choose a
		* large number for timeout.
		@@ -180,14 +191,20 @@ static void set_sg_io_hdr(sg_io_hdr_t* io_hdrp, int dxfer_direction, unsigned ch
		}

		/**
		* unexpected_scsi_sense - Check for unexpected codes in the sense buffer.
		* @sense_buf: buffer containing sense data
		* @len: length of @sense_buf
		* enum scsi_result - Results of checking the SCSI status and sense buffer
		*
		* Return: %true if the sense data is not valid or contains an unexpected sense
		* code, %false otherwise.
		* @SCSI_RES_OK: SCSI status and sense are good
		* @SCSI_RES_ERR: SCSI status or sense contain an unhandled error
		* @SCSI_RES_RETRY: SCSI sense buffer contains a status that indicates that the
		* command should be retried
		*/
		static bool unexpected_scsi_sense(const uint8_t* sense_buf, size_t len) {
		enum scsi_result {
		SCSI_RES_OK = 0,
		SCSI_RES_ERR,
		SCSI_RES_RETRY,
		};

		static enum scsi_result check_scsi_sense(const uint8_t* sense_buf, size_t len) {
		uint8_t response_code = 0;
		uint8_t sense_key = 0;
		uint8_t additional_sense_code = 0;
		@@ -196,14 +213,14 @@ static bool unexpected_scsi_sense(const uint8_t* sense_buf, size_t len) {

		if (!sense_buf \|\| len == 0) {
		ALOGE("Invalid SCSI sense buffer, length: %zu\n", len);
		return true;
		return SCSI_RES_ERR;
		}

		response_code = 0x7f & sense_buf[0];

		if (response_code < 0x70 \|\| response_code > 0x73) {
		ALOGE("Invalid SCSI sense response code: %hhu\n", response_code);
		return true;
		return SCSI_RES_ERR;
		}

		if (response_code >= 0x72) {
		@@ -241,18 +258,28 @@ static bool unexpected_scsi_sense(const uint8_t* sense_buf, size_t len) {
		case 0x0f: /* COMPLETED, not present in kernel headers */
		ALOGD("SCSI success with sense data: key=%hhu, asc=%hhu, ascq=%hhu\n", sense_key,
		additional_sense_code, additional_sense_code_qualifier);
		return false;
		return SCSI_RES_OK;
		case UNIT_ATTENTION:
		ALOGD("UNIT ATTENTION with sense data: key=%hhu, asc=%hhu, ascq=%hhu\n", sense_key,
		additional_sense_code, additional_sense_code_qualifier);
		if (additional_sense_code == 0x29) {
		/* POWER ON or RESET condition */
		return SCSI_RES_RETRY;
		}

		/* treat this UNIT ATTENTION as an error if we don't recognize it */
		break;
		}

		ALOGE("Unexpected SCSI sense data: key=%hhu, asc=%hhu, ascq=%hhu\n", sense_key,
		additional_sense_code, additional_sense_code_qualifier);
		log_buf(ANDROID_LOG_ERROR, "sense buffer: ", sense_buf, len);
		return true;
		return SCSI_RES_ERR;
		}

		static void check_sg_io_hdr(const sg_io_hdr_t* io_hdrp) {
		static enum scsi_result check_sg_io_hdr(const sg_io_hdr_t* io_hdrp) {
		if (io_hdrp->status == 0 && io_hdrp->host_status == 0 && io_hdrp->driver_status == 0) {
		return;
		return SCSI_RES_OK;
		}

		if (io_hdrp->status & 0x01) {
		@@ -260,12 +287,14 @@ static void check_sg_io_hdr(const sg_io_hdr_t* io_hdrp) {
		}

		if (io_hdrp->masked_status != GOOD && io_hdrp->sb_len_wr > 0) {
		bool sense_error = unexpected_scsi_sense(io_hdrp->sbp, io_hdrp->sb_len_wr);
		if (sense_error) {
		enum scsi_result scsi_res = check_scsi_sense(io_hdrp->sbp, io_hdrp->sb_len_wr);
		if (scsi_res == SCSI_RES_RETRY) {
		return SCSI_RES_RETRY;
		} else if (scsi_res != SCSI_RES_OK) {
		ALOGE("Unexpected SCSI sense. masked_status: %hhu, host_status: %hu, driver_status: "
		"%hu\n",
		io_hdrp->masked_status, io_hdrp->host_status, io_hdrp->driver_status);
		return;
		return scsi_res;
		}
		}

		@@ -278,7 +307,7 @@ static void check_sg_io_hdr(const sg_io_hdr_t* io_hdrp) {
		default:
		ALOGE("SG_IO failed with masked_status: %hhu, host_status: %hu, driver_status: %hu\n",
		io_hdrp->masked_status, io_hdrp->host_status, io_hdrp->driver_status);
		return;
		return SCSI_RES_ERR;
		}

		if (io_hdrp->host_status != 0) {
		@@ -289,6 +318,7 @@ static void check_sg_io_hdr(const sg_io_hdr_t* io_hdrp) {
		if (io_hdrp->resid != 0) {
		ALOGE("SG_IO resid was non-zero: %d\n", io_hdrp->resid);
		}
		return SCSI_RES_ERR;
		}

		static int send_mmc_rpmb_req(int mmc_fd, const struct storage_rpmb_send_req* req) {
		@@ -363,6 +393,8 @@ static int send_ufs_rpmb_req(int sg_fd, const struct storage_rpmb_send_req* req)
		struct sec_proto_cdb out_cdb = {0xB5, 0xEC, 0x00, 0x01, 0x00, 0x00, 0, 0x00, 0x00};
		unsigned char sense_buffer[32];

		bool is_request_write = req->reliable_write_size > 0;

		wl_rc = acquire_wake_lock(PARTIAL_WAKE_LOCK, UFS_WAKE_LOCK_NAME);
		if (wl_rc < 0) {
		ALOGE("%s: failed to acquire wakelock: %d, %s\n", __func__, wl_rc, strerror(errno));
		@@ -371,8 +403,10 @@ static int send_ufs_rpmb_req(int sg_fd, const struct storage_rpmb_send_req* req)

		if (req->reliable_write_size) {
		/* Prepare SECURITY PROTOCOL OUT command. */
		out_cdb.length = __builtin_bswap32(req->reliable_write_size);
		sg_io_hdr_t io_hdr;
		int retry_count = UFS_RPMB_WRITE_RETRY_COUNT;
		do {
		out_cdb.length = __builtin_bswap32(req->reliable_write_size);
		set_sg_io_hdr(&io_hdr, SG_DXFER_TO_DEV, sizeof(out_cdb), sizeof(sense_buffer),
		req->reliable_write_size, (void)write_buf, (unsigned char)&out_cdb,
		sense_buffer);
		@@ -381,22 +415,32 @@ static int send_ufs_rpmb_req(int sg_fd, const struct storage_rpmb_send_req* req)
		ALOGE("%s: ufs ioctl failed: %d, %s\n", __func__, rc, strerror(errno));
		goto err_op;
		}
		check_sg_io_hdr(&io_hdr);
		} while (check_sg_io_hdr(&io_hdr) == SCSI_RES_RETRY && retry_count-- > 0);
		write_buf += req->reliable_write_size;
		}

		if (req->write_size) {
		/* Prepare SECURITY PROTOCOL OUT command. */
		out_cdb.length = __builtin_bswap32(req->write_size);
		sg_io_hdr_t io_hdr;
		/*
		* We don't retry write response request messages (is_request_write ==
		* true) because a unit attention condition between the write and
		* requesting a response means that the device was reset and we can't
		* get a response to our original write. We can only retry this SG_IO
		* call when it is the first call in our sequence.
		*/
		int retry_count = is_request_write ? 0 : UFS_RPMB_READ_RETRY_COUNT;
		do {
		out_cdb.length = __builtin_bswap32(req->write_size);
		set_sg_io_hdr(&io_hdr, SG_DXFER_TO_DEV, sizeof(out_cdb), sizeof(sense_buffer),
		req->write_size, (void)write_buf, (unsigned char)&out_cdb, sense_buffer);
		req->write_size, (void)write_buf, (unsigned char)&out_cdb,
		sense_buffer);
		rc = ioctl(sg_fd, SG_IO, &io_hdr);
		if (rc < 0) {
		ALOGE("%s: ufs ioctl failed: %d, %s\n", __func__, rc, strerror(errno));
		goto err_op;
		}
		check_sg_io_hdr(&io_hdr);
		} while (check_sg_io_hdr(&io_hdr) == SCSI_RES_RETRY && retry_count-- > 0);
		write_buf += req->write_size;
		}