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Subject[PATCH v2 5/6] fpga: m10bmc-sec: add max10 secure update functions
Date
Extend the MAX10 BMC Security Engine driver to include
the functions that enable secure updates of BMC images,
FPGA images, etc.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
---
v2:
- Reworked the rsu_start_done() function to make it more readable
- Reworked while-loop condition/content in rsu_prog_ready()
- Minor code cleanup per review comments
- Added a comment to the m10bmc_sec_poll_complete() function to
explain the context (could take 30+ minutes to complete).
- Added m10bmc_ prefix to functions in m10bmc_iops structure
- Moved MAX10 BMC address and function definitions to a separate
patch.
---
drivers/fpga/intel-m10-bmc-secure.c | 298 ++++++++++++++++++++++++++++
1 file changed, 298 insertions(+)

diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c
index 5bb45499b332..a9617c5b3845 100644
--- a/drivers/fpga/intel-m10-bmc-secure.c
+++ b/drivers/fpga/intel-m10-bmc-secure.c
@@ -201,6 +201,300 @@ static int m10bmc_pr_canceled_csks(struct ifpga_sec_mgr *imgr,
csk_map, nbits);
}

+static void log_error_regs(struct m10bmc_sec *sec, u32 doorbell)
+{
+ u32 auth_result;
+
+ dev_err(sec->dev, "RSU error status: 0x%08x\n", doorbell);
+
+ if (!m10bmc_sys_read(sec->m10bmc, M10BMC_AUTH_RESULT, &auth_result))
+ dev_err(sec->dev, "RSU auth result: 0x%08x\n", auth_result);
+}
+
+static enum ifpga_sec_err rsu_check_idle(struct m10bmc_sec *sec)
+{
+ u32 doorbell;
+ int ret;
+
+ ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell);
+ if (ret)
+ return IFPGA_SEC_ERR_RW_ERROR;
+
+ if (rsu_prog(doorbell) != RSU_PROG_IDLE &&
+ rsu_prog(doorbell) != RSU_PROG_RSU_DONE) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_BUSY;
+ }
+
+ return IFPGA_SEC_ERR_NONE;
+}
+
+static inline bool rsu_start_done(u32 doorbell)
+{
+ u32 status, progress;
+
+ if (doorbell & DRBL_RSU_REQUEST)
+ return false;
+
+ status = rsu_stat(doorbell);
+ if (status == RSU_STAT_ERASE_FAIL || status == RSU_STAT_WEAROUT)
+ return true;
+
+ progress = rsu_prog(doorbell);
+ if (progress != RSU_PROG_IDLE && progress != RSU_PROG_RSU_DONE)
+ return true;
+
+ return false;
+}
+
+static enum ifpga_sec_err rsu_update_init(struct m10bmc_sec *sec)
+{
+ u32 doorbell, status;
+ int ret;
+
+ ret = m10bmc_sys_update_bits(sec->m10bmc, M10BMC_DOORBELL,
+ DRBL_RSU_REQUEST | DRBL_HOST_STATUS,
+ DRBL_RSU_REQUEST |
+ FIELD_PREP(DRBL_HOST_STATUS,
+ HOST_STATUS_IDLE));
+ if (ret)
+ return IFPGA_SEC_ERR_RW_ERROR;
+
+ ret = regmap_read_poll_timeout(sec->m10bmc->regmap,
+ M10BMC_SYS_BASE + M10BMC_DOORBELL,
+ doorbell,
+ rsu_start_done(doorbell),
+ NIOS_HANDSHAKE_INTERVAL_US,
+ NIOS_HANDSHAKE_TIMEOUT_US);
+
+ if (ret == -ETIMEDOUT) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_TIMEOUT;
+ } else if (ret) {
+ return IFPGA_SEC_ERR_RW_ERROR;
+ }
+
+ status = rsu_stat(doorbell);
+ if (status == RSU_STAT_WEAROUT) {
+ dev_warn(sec->dev, "Excessive flash update count detected\n");
+ return IFPGA_SEC_ERR_WEAROUT;
+ } else if (status == RSU_STAT_ERASE_FAIL) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_HW_ERROR;
+ }
+
+ return IFPGA_SEC_ERR_NONE;
+}
+
+static enum ifpga_sec_err rsu_prog_ready(struct m10bmc_sec *sec)
+{
+ unsigned long poll_timeout;
+ u32 doorbell, progress;
+ int ret;
+
+ ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell);
+ if (ret)
+ return IFPGA_SEC_ERR_RW_ERROR;
+
+ poll_timeout = jiffies + msecs_to_jiffies(RSU_PREP_TIMEOUT_MS);
+ while (rsu_prog(doorbell) == RSU_PROG_PREPARE) {
+ msleep(RSU_PREP_INTERVAL_MS);
+ if (time_after(jiffies, poll_timeout))
+ break;
+
+ ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell);
+ if (ret)
+ return IFPGA_SEC_ERR_RW_ERROR;
+ }
+
+ progress = rsu_prog(doorbell);
+ if (progress == RSU_PROG_PREPARE) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_TIMEOUT;
+ } else if (progress != RSU_PROG_READY) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_HW_ERROR;
+ }
+
+ return IFPGA_SEC_ERR_NONE;
+}
+
+static enum ifpga_sec_err rsu_send_data(struct m10bmc_sec *sec)
+{
+ u32 doorbell;
+ int ret;
+
+ ret = m10bmc_sys_update_bits(sec->m10bmc, M10BMC_DOORBELL,
+ DRBL_HOST_STATUS,
+ FIELD_PREP(DRBL_HOST_STATUS,
+ HOST_STATUS_WRITE_DONE));
+ if (ret)
+ return IFPGA_SEC_ERR_RW_ERROR;
+
+ ret = regmap_read_poll_timeout(sec->m10bmc->regmap,
+ M10BMC_SYS_BASE + M10BMC_DOORBELL,
+ doorbell,
+ rsu_prog(doorbell) != RSU_PROG_READY,
+ NIOS_HANDSHAKE_INTERVAL_US,
+ NIOS_HANDSHAKE_TIMEOUT_US);
+
+ if (ret == -ETIMEDOUT) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_TIMEOUT;
+ } else if (ret) {
+ return IFPGA_SEC_ERR_RW_ERROR;
+ }
+
+ switch (rsu_stat(doorbell)) {
+ case RSU_STAT_NORMAL:
+ case RSU_STAT_NIOS_OK:
+ case RSU_STAT_USER_OK:
+ case RSU_STAT_FACTORY_OK:
+ break;
+ default:
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_HW_ERROR;
+ }
+
+ return IFPGA_SEC_ERR_NONE;
+}
+
+static int rsu_check_complete(struct m10bmc_sec *sec, u32 *doorbell)
+{
+ if (m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, doorbell))
+ return -EIO;
+
+ switch (rsu_stat(*doorbell)) {
+ case RSU_STAT_NORMAL:
+ case RSU_STAT_NIOS_OK:
+ case RSU_STAT_USER_OK:
+ case RSU_STAT_FACTORY_OK:
+ case RSU_STAT_WEAROUT:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (rsu_prog(*doorbell)) {
+ case RSU_PROG_IDLE:
+ case RSU_PROG_RSU_DONE:
+ return 0;
+ case RSU_PROG_AUTHENTICATING:
+ case RSU_PROG_COPYING:
+ case RSU_PROG_UPDATE_CANCEL:
+ case RSU_PROG_PROGRAM_KEY_HASH:
+ return -EAGAIN;
+ default:
+ return -EINVAL;
+ }
+}
+
+static enum ifpga_sec_err m10bmc_sec_prepare(struct ifpga_sec_mgr *imgr)
+{
+ struct m10bmc_sec *sec = imgr->priv;
+ enum ifpga_sec_err ret;
+
+ if (imgr->remaining_size > M10BMC_STAGING_SIZE)
+ return IFPGA_SEC_ERR_INVALID_SIZE;
+
+ ret = rsu_check_idle(sec);
+ if (ret)
+ return ret;
+
+ ret = rsu_update_init(sec);
+ if (ret)
+ return ret;
+
+ return rsu_prog_ready(sec);
+}
+
+static enum ifpga_sec_err
+m10bmc_sec_write_blk(struct ifpga_sec_mgr *imgr, u32 offset, u32 size)
+{
+ struct m10bmc_sec *sec = imgr->priv;
+ unsigned int stride = regmap_get_reg_stride(sec->m10bmc->regmap);
+ u32 doorbell;
+ int ret;
+
+ ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell);
+ if (ret) {
+ return IFPGA_SEC_ERR_RW_ERROR;
+ } else if (rsu_prog(doorbell) != RSU_PROG_READY) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_HW_ERROR;
+ }
+
+ ret = m10bmc_raw_bulk_write(sec->m10bmc, M10BMC_STAGING_BASE + offset,
+ (void *)imgr->data + offset, size / stride);
+
+ return ret ? IFPGA_SEC_ERR_RW_ERROR : IFPGA_SEC_ERR_NONE;
+}
+
+/*
+ * m10bmc_sec_poll_complete() is called after handing things off to
+ * the BMC firmware. Depending on the type of update, it could be
+ * 30+ minutes before the BMC firmware completes the update. The
+ * imgr->driver_unload check allows the driver to be unloaded,
+ * but the BMC firmware will continue the update and no further
+ * secure updates can be started for this device until the update
+ * is complete.
+ */
+static enum ifpga_sec_err m10bmc_sec_poll_complete(struct ifpga_sec_mgr *imgr)
+{
+ struct m10bmc_sec *sec = imgr->priv;
+ unsigned long poll_timeout;
+ enum ifpga_sec_err result;
+ u32 doorbell;
+ int ret;
+
+ result = rsu_send_data(sec);
+ if (result)
+ return result;
+
+ ret = rsu_check_complete(sec, &doorbell);
+ poll_timeout = jiffies + msecs_to_jiffies(RSU_COMPLETE_TIMEOUT_MS);
+
+ while (ret == -EAGAIN && !time_after(jiffies, poll_timeout)) {
+ msleep(RSU_COMPLETE_INTERVAL_MS);
+ ret = rsu_check_complete(sec, &doorbell);
+ if (imgr->driver_unload)
+ return IFPGA_SEC_ERR_CANCELED;
+ }
+
+ if (ret == -EAGAIN) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_TIMEOUT;
+ } else if (ret == -EIO) {
+ return IFPGA_SEC_ERR_RW_ERROR;
+ } else if (ret) {
+ log_error_regs(sec, doorbell);
+ return IFPGA_SEC_ERR_HW_ERROR;
+ }
+
+ return IFPGA_SEC_ERR_NONE;
+}
+
+static enum ifpga_sec_err m10bmc_sec_cancel(struct ifpga_sec_mgr *imgr)
+{
+ struct m10bmc_sec *sec = imgr->priv;
+ u32 doorbell;
+ int ret;
+
+ ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell);
+ if (ret)
+ return IFPGA_SEC_ERR_RW_ERROR;
+
+ if (rsu_prog(doorbell) != RSU_PROG_READY)
+ return IFPGA_SEC_ERR_BUSY;
+
+ ret = m10bmc_sys_update_bits(sec->m10bmc, M10BMC_DOORBELL,
+ DRBL_HOST_STATUS,
+ FIELD_PREP(DRBL_HOST_STATUS,
+ HOST_STATUS_ABORT_RSU));
+
+ return ret ? IFPGA_SEC_ERR_RW_ERROR : IFPGA_SEC_ERR_NONE;
+}
+
static const struct ifpga_sec_mgr_ops m10bmc_iops = {
.user_flash_count = m10bmc_user_flash_count,
.bmc_root_entry_hash = m10bmc_bmc_root_entry_hash,
@@ -215,6 +509,10 @@ static const struct ifpga_sec_mgr_ops m10bmc_iops = {
.bmc_canceled_csk_nbits = m10bmc_csk_cancel_nbits,
.sr_canceled_csk_nbits = m10bmc_csk_cancel_nbits,
.pr_canceled_csk_nbits = m10bmc_csk_cancel_nbits,
+ .prepare = m10bmc_sec_prepare,
+ .write_blk = m10bmc_sec_write_blk,
+ .poll_complete = m10bmc_sec_poll_complete,
+ .cancel = m10bmc_sec_cancel,
};

static int m10bmc_secure_probe(struct platform_device *pdev)
--
2.17.1
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