[U-Boot] [PATCH v3 11/20] optee: support routing of rpmb data frames to mmc
Jens Wiklander
jens.wiklander at linaro.org
Mon Sep 3 14:47:02 UTC 2018
Adds support in optee supplicant to route signed (MACed) RPMB frames
from OP-TEE Secure OS to MMC and vice versa to manipulate the RPMB
partition.
Tested-by: Igor Opaniuk <igor.opaniuk at linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander at linaro.org>
---
drivers/tee/optee/Makefile | 1 +
drivers/tee/optee/core.c | 8 ++
drivers/tee/optee/optee_private.h | 55 ++++++++-
drivers/tee/optee/rpmb.c | 181 ++++++++++++++++++++++++++++++
drivers/tee/optee/supplicant.c | 3 +
5 files changed, 247 insertions(+), 1 deletion(-)
create mode 100644 drivers/tee/optee/rpmb.c
diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile
index 6148feb474a5..928d3f80027f 100644
--- a/drivers/tee/optee/Makefile
+++ b/drivers/tee/optee/Makefile
@@ -2,3 +2,4 @@
obj-y += core.o
obj-y += supplicant.o
+obj-$(CONFIG_SUPPORT_EMMC_RPMB) += rpmb.o
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 726382da9bb8..7f870f2f735d 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -315,6 +315,13 @@ static u32 do_call_with_arg(struct udevice *dev, struct optee_msg_arg *arg)
param.a3 = res.a3;
handle_rpc(dev, ¶m, &page_list);
} else {
+ /*
+ * In case we've accessed RPMB to serve an RPC
+ * request we need to restore the previously
+ * selected partition as the caller may expect it
+ * to remain unchanged.
+ */
+ optee_suppl_rpmb_release(dev);
return call_err_to_res(res.a0);
}
}
@@ -651,4 +658,5 @@ U_BOOT_DRIVER(optee) = {
.probe = optee_probe,
.ops = &optee_ops,
.platdata_auto_alloc_size = sizeof(struct optee_pdata),
+ .priv_auto_alloc_size = sizeof(struct optee_private),
};
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index 35adb83afcc7..9442d1c176bc 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -6,7 +6,60 @@
#ifndef __OPTEE_PRIVATE_H
#define __OPTEE_PRIVATE_H
+#include <tee.h>
+#include <log.h>
+
+/**
+ * struct optee_private - OP-TEE driver private data
+ * @rpmb_mmc: mmc device for the RPMB partition
+ * @rpmb_dev_id: mmc device id matching @rpmb_mmc
+ * @rpmb_original_part: the previosly active partition on the mmc device,
+ * used to restore active the partition when the RPMB
+ * accesses are finished
+ */
+struct optee_private {
+ struct mmc *rpmb_mmc;
+ int rpmb_dev_id;
+ int rpmb_original_part;
+};
+
+struct optee_msg_arg;
+
+void optee_suppl_cmd(struct udevice *dev, struct tee_shm *shm_arg,
+ void **page_list);
+
+#ifdef CONFIG_SUPPORT_EMMC_RPMB
+/**
+ * optee_suppl_cmd_rpmb() - route RPMB frames to mmc
+ * @dev: device with the selected RPMB partition
+ * @arg: OP-TEE message holding the frames to transmit to the mmc
+ * and space for the response frames.
+ *
+ * Routes signed (MACed) RPMB frames from OP-TEE Secure OS to MMC and vice
+ * versa to manipulate the RPMB partition.
+ */
+void optee_suppl_cmd_rpmb(struct udevice *dev, struct optee_msg_arg *arg);
+
+/**
+ * optee_suppl_rpmb_release() - release mmc device
+ * @dev: mmc device
+ *
+ * Releases the mmc device and restores the previously selected partition.
+ */
+void optee_suppl_rpmb_release(struct udevice *dev);
+#else
+static inline void optee_suppl_cmd_rpmb(struct udevice *dev,
+ struct optee_msg_arg *arg)
+{
+ debug("OPTEE_MSG_RPC_CMD_RPMB not implemented\n");
+ arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
+}
+
+static inline void optee_suppl_rpmb_release(struct udevice *dev)
+{
+}
+#endif
+
void *optee_alloc_and_init_page_list(void *buf, ulong len, u64 *phys_buf_ptr);
-void optee_suppl_cmd(struct udevice *dev, void *shm, void **page_list);
#endif /* __OPTEE_PRIVATE_H */
diff --git a/drivers/tee/optee/rpmb.c b/drivers/tee/optee/rpmb.c
new file mode 100644
index 000000000000..955155b3f8b1
--- /dev/null
+++ b/drivers/tee/optee/rpmb.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: BSD-2-Clause
+/*
+ * Copyright (c) 2018 Linaro Limited
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <log.h>
+#include <tee.h>
+#include <mmc.h>
+
+#include "optee_msg.h"
+#include "optee_private.h"
+
+/*
+ * Request and response definitions must be in sync with the secure side of
+ * OP-TEE.
+ */
+
+/* Request */
+struct rpmb_req {
+ u16 cmd;
+#define RPMB_CMD_DATA_REQ 0x00
+#define RPMB_CMD_GET_DEV_INFO 0x01
+ u16 dev_id;
+ u16 block_count;
+ /* Optional data frames (rpmb_data_frame) follow */
+};
+
+#define RPMB_REQ_DATA(req) ((void *)((struct rpmb_req *)(req) + 1))
+
+/* Response to device info request */
+struct rpmb_dev_info {
+ u8 cid[16];
+ u8 rpmb_size_mult; /* EXT CSD-slice 168: RPMB Size */
+ u8 rel_wr_sec_c; /* EXT CSD-slice 222: Reliable Write Sector */
+ /* Count */
+ u8 ret_code;
+#define RPMB_CMD_GET_DEV_INFO_RET_OK 0x00
+#define RPMB_CMD_GET_DEV_INFO_RET_ERROR 0x01
+};
+
+static void release_mmc(struct optee_private *priv)
+{
+ int rc;
+
+ if (!priv->rpmb_mmc)
+ return;
+
+ rc = blk_select_hwpart_devnum(IF_TYPE_MMC, priv->rpmb_dev_id,
+ priv->rpmb_original_part);
+ if (rc)
+ debug("%s: blk_select_hwpart_devnum() failed: %d\n",
+ __func__, rc);
+
+ priv->rpmb_mmc = NULL;
+}
+
+static struct mmc *get_mmc(struct optee_private *priv, int dev_id)
+{
+ struct mmc *mmc;
+ int rc;
+
+ if (priv->rpmb_mmc && priv->rpmb_dev_id == dev_id)
+ return priv->rpmb_mmc;
+
+ release_mmc(priv);
+
+ mmc = find_mmc_device(dev_id);
+ if (!mmc) {
+ debug("Cannot find RPMB device\n");
+ return NULL;
+ }
+ if (!(mmc->version & MMC_VERSION_MMC)) {
+ debug("Device id %d is not an eMMC device\n", dev_id);
+ return NULL;
+ }
+ if (mmc->version < MMC_VERSION_4_41) {
+ debug("Device id %d: RPMB not supported before version 4.41\n",
+ dev_id);
+ return NULL;
+ }
+
+ priv->rpmb_original_part = mmc_get_blk_desc(mmc)->hwpart;
+
+ rc = blk_select_hwpart_devnum(IF_TYPE_MMC, dev_id, MMC_PART_RPMB);
+ if (rc) {
+ debug("Device id %d: cannot select RPMB partition: %d\n",
+ dev_id, rc);
+ return NULL;
+ }
+
+ priv->rpmb_mmc = mmc;
+ priv->rpmb_dev_id = dev_id;
+ return mmc;
+}
+
+static u32 rpmb_get_dev_info(u16 dev_id, struct rpmb_dev_info *info)
+{
+ struct mmc *mmc = find_mmc_device(dev_id);
+
+ if (!mmc)
+ return TEE_ERROR_ITEM_NOT_FOUND;
+
+ if (!mmc->ext_csd)
+ return TEE_ERROR_GENERIC;
+
+ memcpy(info->cid, mmc->cid, sizeof(info->cid));
+ info->rel_wr_sec_c = mmc->ext_csd[222];
+ info->rpmb_size_mult = mmc->ext_csd[168];
+ info->ret_code = RPMB_CMD_GET_DEV_INFO_RET_OK;
+
+ return TEE_SUCCESS;
+}
+
+static u32 rpmb_process_request(struct optee_private *priv, void *req,
+ ulong req_size, void *rsp, ulong rsp_size)
+{
+ struct rpmb_req *sreq = req;
+ struct mmc *mmc;
+
+ if (req_size < sizeof(*sreq))
+ return TEE_ERROR_BAD_PARAMETERS;
+
+ switch (sreq->cmd) {
+ case RPMB_CMD_DATA_REQ:
+ mmc = get_mmc(priv, sreq->dev_id);
+ if (!mmc)
+ return TEE_ERROR_ITEM_NOT_FOUND;
+ if (mmc_rpmb_route_frames(mmc, RPMB_REQ_DATA(req),
+ req_size - sizeof(struct rpmb_req),
+ rsp, rsp_size))
+ return TEE_ERROR_BAD_PARAMETERS;
+ return TEE_SUCCESS;
+
+ case RPMB_CMD_GET_DEV_INFO:
+ if (req_size != sizeof(struct rpmb_req) ||
+ rsp_size != sizeof(struct rpmb_dev_info)) {
+ debug("Invalid req/rsp size\n");
+ return TEE_ERROR_BAD_PARAMETERS;
+ }
+ return rpmb_get_dev_info(sreq->dev_id, rsp);
+
+ default:
+ debug("Unsupported RPMB command: %d\n", sreq->cmd);
+ return TEE_ERROR_BAD_PARAMETERS;
+ }
+}
+
+void optee_suppl_cmd_rpmb(struct udevice *dev, struct optee_msg_arg *arg)
+{
+ struct tee_shm *req_shm;
+ struct tee_shm *rsp_shm;
+ void *req_buf;
+ void *rsp_buf;
+ ulong req_size;
+ ulong rsp_size;
+
+ if (arg->num_params != 2 ||
+ arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_RMEM_INPUT ||
+ arg->params[1].attr != OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT) {
+ arg->ret = TEE_ERROR_BAD_PARAMETERS;
+ return;
+ }
+
+ req_shm = (struct tee_shm *)(ulong)arg->params[0].u.rmem.shm_ref;
+ req_buf = (u8 *)req_shm->addr + arg->params[0].u.rmem.offs;
+ req_size = arg->params[0].u.rmem.size;
+
+ rsp_shm = (struct tee_shm *)(ulong)arg->params[1].u.rmem.shm_ref;
+ rsp_buf = (u8 *)rsp_shm->addr + arg->params[1].u.rmem.offs;
+ rsp_size = arg->params[1].u.rmem.size;
+
+ arg->ret = rpmb_process_request(dev_get_priv(dev), req_buf, req_size,
+ rsp_buf, rsp_size);
+}
+
+void optee_suppl_rpmb_release(struct udevice *dev)
+{
+ release_mmc(dev_get_priv(dev));
+}
diff --git a/drivers/tee/optee/supplicant.c b/drivers/tee/optee/supplicant.c
index 2239b1bf7b37..b1ea65bdb2e3 100644
--- a/drivers/tee/optee/supplicant.c
+++ b/drivers/tee/optee/supplicant.c
@@ -85,6 +85,9 @@ void optee_suppl_cmd(struct udevice *dev, struct tee_shm *shm_arg,
debug("OPTEE_MSG_RPC_CMD_FS not implemented\n");
arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
break;
+ case OPTEE_MSG_RPC_CMD_RPMB:
+ optee_suppl_cmd_rpmb(dev, arg);
+ break;
default:
arg->ret = TEE_ERROR_NOT_IMPLEMENTED;
}
--
2.17.1
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