Adds the driver for communication interface to secure-enclave, for exchanging messages with NXP secure enclave HW IP(s) like EdgeLock Enclave from: - User-Space Applications via character driver. ABI documentation for the NXP secure-enclave driver. User-space library using this driver: - i.MX Secure Enclave library: -- URL: https://github.com/nxp-imx/imx-secure-enclave.git, - i.MX Secure Middle-Ware: -- URL: https://github.com/nxp-imx/imx-smw.git Signed-off-by: Pankaj Gupta <pankaj.gupta@xxxxxxx> --- Documentation/ABI/testing/se-cdev | 43 +++ drivers/firmware/imx/ele_common.c | 192 ++++++++++- drivers/firmware/imx/ele_common.h | 4 + drivers/firmware/imx/se_ctrl.c | 697 ++++++++++++++++++++++++++++++++++++++ drivers/firmware/imx/se_ctrl.h | 49 +++ include/uapi/linux/se_ioctl.h | 94 +++++ 6 files changed, 1076 insertions(+), 3 deletions(-) diff --git a/Documentation/ABI/testing/se-cdev b/Documentation/ABI/testing/se-cdev new file mode 100644 index 000000000000..3451c909ccc4 --- /dev/null +++ b/Documentation/ABI/testing/se-cdev @@ -0,0 +1,43 @@ +What: /dev/<se>_mu[0-9]+_ch[0-9]+ +Date: May 2024 +KernelVersion: 6.8 +Contact: linux-imx@xxxxxxx, pankaj.gupta@xxxxxxx +Description: + NXP offers multiple hardware IP(s) for secure enclaves like EdgeLock- + Enclave(ELE), SECO. The character device file descriptors + /dev/<se>_mu*_ch* are the interface between userspace NXP's secure- + enclave shared library and the kernel driver. + + The ioctl(2)-based ABI is defined and documented in + [include]<linux/firmware/imx/ele_mu_ioctl.h>. + ioctl(s) are used primarily for: + - shared memory management + - allocation of I/O buffers + - getting mu info + - setting a dev-ctx as receiver to receive all the commands from FW + - getting SoC info + - send command and receive command response + + The following file operations are supported: + + open(2) + Currently the only useful flags are O_RDWR. + + read(2) + Every read() from the opened character device context is waiting on + wait_event_interruptible, that gets set by the registered mailbox callback + function, indicating a message received from the firmware on message- + unit. + + write(2) + Every write() to the opened character device context needs to acquire + mailbox_lock before sending message on to the message unit. + + close(2) + Stops and frees up the I/O contexts that were associated + with the file descriptor. + +Users: https://github.com/nxp-imx/imx-secure-enclave.git, + https://github.com/nxp-imx/imx-smw.git + crypto/skcipher, + drivers/nvmem/imx-ocotp-ele.c diff --git a/drivers/firmware/imx/ele_common.c b/drivers/firmware/imx/ele_common.c index b2be32550e9b..88169cd8f369 100644 --- a/drivers/firmware/imx/ele_common.c +++ b/drivers/firmware/imx/ele_common.c @@ -78,6 +78,149 @@ int ele_msg_send_rcv(struct se_if_priv *priv, void *tx_msg, void *rx_msg) return err; } +int ele_miscdev_msg_rcv(struct se_if_device_ctx *dev_ctx, + void *rx_buf, + int rx_buf_sz) +{ + struct se_msg_hdr *header; + int err; + + err = wait_event_interruptible(dev_ctx->wq, dev_ctx->pending_hdr != 0); + if (err) { + dev_err(dev_ctx->dev, + "%s: Err[0x%x]:Interrupted by signal.\n", + dev_ctx->miscdev.name, err); + goto exit; + } + + header = (struct se_msg_hdr *) dev_ctx->temp_resp; + + if (header->tag == dev_ctx->priv->rsp_tag) { + if (dev_ctx->priv->waiting_rsp_dev && dev_ctx->priv->waiting_rsp_dev != dev_ctx) { + dev_warn(dev_ctx->dev, + "Dev-ctx waiting for response mismatch (%s != %s).\n", + dev_ctx->miscdev.name, dev_ctx->priv->waiting_rsp_dev->miscdev.name); + err = -EPERM; + goto exit; + } + } + + dev_dbg(dev_ctx->dev, + "%s: %s %s\n", + dev_ctx->miscdev.name, + __func__, + "message received, start transmit to user"); + + /* + * Check that the size passed as argument is larger than + * the one carried in the message. + * + * In case of US-command/response, the dev_ctx->temp_resp_size + * is set before sending the command. + * + * In case of NVM Slave-command/response, the dev_ctx->temp_resp_size + * is set after receing the message from mailbox. + */ + if (dev_ctx->temp_resp_size > rx_buf_sz) { + dev_err(dev_ctx->dev, + "%s: User buffer too small (%d < %d)\n", + dev_ctx->miscdev.name, + rx_buf_sz, dev_ctx->temp_resp_size); + dev_ctx->temp_resp_size = rx_buf_sz; + } + + /* We may need to copy the output data to user before + * delivering the completion message. + */ + err = se_dev_ctx_cpy_out_data(dev_ctx, true); + if (err < 0) + goto exit; + + /* Copy data from the buffer */ + print_hex_dump_debug("to user ", DUMP_PREFIX_OFFSET, 4, 4, + dev_ctx->temp_resp, dev_ctx->temp_resp_size, false); + if (copy_to_user(rx_buf, dev_ctx->temp_resp, dev_ctx->temp_resp_size)) { + dev_err(dev_ctx->dev, + "%s: Failed to copy to user\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + + err = dev_ctx->temp_resp_size; +exit: + if (err < 0) + se_dev_ctx_cpy_out_data(dev_ctx, false); + + /* free memory allocated on the shared buffers. */ + dev_ctx->secure_mem.pos = 0; + dev_ctx->non_secure_mem.pos = 0; + + dev_ctx->pending_hdr = 0; + se_dev_ctx_shared_mem_cleanup(dev_ctx); + + return err; +} + +int ele_miscdev_msg_send(struct se_if_device_ctx *dev_ctx, + void *tx_msg, int tx_msg_sz) +{ + struct se_if_priv *priv = dev_ctx->priv; + struct se_msg_hdr *header; + u32 size_to_send; + int err; + + header = (struct se_msg_hdr *) tx_msg; + + /* + * Check that the size passed as argument matches the size + * carried in the message. + */ + size_to_send = header->size << 2; + + if (size_to_send != tx_msg_sz) { + err = -EINVAL; + dev_err(priv->dev, + "%s: User buf hdr(0x%x) sz mismatced with input-sz (%d != %d).\n", + dev_ctx->miscdev.name, *(u32 *)header, size_to_send, tx_msg_sz); + goto exit; + } + + /* Check the message is valid according to tags */ + if (header->tag == priv->rsp_tag) { + /* Check the device context can send the command */ + if (dev_ctx != priv->cmd_receiver_dev) { + dev_err(priv->dev, + "%s: Channel not configured to send resp to FW.", + dev_ctx->miscdev.name); + err = -EPERM; + goto exit; + } + } else if (header->tag == priv->cmd_tag) { + if (priv->waiting_rsp_dev != dev_ctx) { + dev_err(priv->dev, + "%s: Channel not configured to send cmd to FW.", + dev_ctx->miscdev.name); + err = -EPERM; + goto exit; + } + lockdep_assert_held(&priv->se_if_cmd_lock); + } else { + dev_err(priv->dev, + "%s: The message does not have a valid TAG\n", + dev_ctx->miscdev.name); + err = -EINVAL; + goto exit; + } + err = ele_msg_send(priv, tx_msg); + if (err < 0) + goto exit; + + err = size_to_send; +exit: + return err; +} + static bool exception_for_size(struct se_if_priv *priv, struct se_msg_hdr *header) { @@ -99,6 +242,7 @@ static bool exception_for_size(struct se_if_priv *priv, void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg) { struct device *dev = mbox_cl->dev; + struct se_if_device_ctx *dev_ctx; struct se_if_priv *priv; struct se_msg_hdr *header; u32 rx_msg_sz; @@ -114,8 +258,50 @@ void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg) header = msg; rx_msg_sz = header->size << 2; - if (header->tag == priv->rsp_tag) { - if (!priv->waiting_rsp_dev) { + /* Incoming command: wake up the receiver if any. */ + if (header->tag == priv->cmd_tag) { + dev_dbg(dev, "Selecting cmd receiver\n"); + dev_ctx = priv->cmd_receiver_dev; + /* Pre-allocated buffer of MAX_NVM_MSG_LEN + * as the NVM command are initiated by FW. + * Size is revealed as part of this call function. + */ + if (rx_msg_sz > MAX_NVM_MSG_LEN) { + dev_err(dev, + "%s: Msg recvd hdr(0x%x) with greater[%d] than allocated buf-sz.\n", + dev_ctx->miscdev.name, + *(u32 *) header, + rx_msg_sz); + } else + memcpy(dev_ctx->temp_resp, msg, rx_msg_sz); + + /* NVM buffer size are not known prior receiving it from FW. + */ + dev_ctx->temp_resp_size = rx_msg_sz; + + /* Allow user to read */ + dev_ctx->pending_hdr = 1; + wake_up_interruptible(&dev_ctx->wq); + + return; + } else if (header->tag == priv->rsp_tag) { + if (priv->waiting_rsp_dev) { + dev_dbg(dev, "Selecting rsp waiter\n"); + dev_ctx = priv->waiting_rsp_dev; + if (rx_msg_sz != dev_ctx->temp_resp_size + && !exception_for_size(priv, header)) + dev_err(dev, + "%s: Msg RSP hdr(0x%x) with different sz(%d != %d).\n", + dev_ctx->miscdev.name, + *(u32 *) header, + rx_msg_sz, dev_ctx->temp_resp_size); + else + memcpy(dev_ctx->temp_resp, msg, rx_msg_sz); + + /* Allow user to read */ + dev_ctx->pending_hdr = 1; + wake_up_interruptible(&dev_ctx->wq); + } else { /* * Reading the EdgeLock Enclave response * to the command, sent by other @@ -132,8 +318,8 @@ void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg) complete(&priv->done); spin_unlock(&priv->lock); - return; } + return; } dev_err(dev, "Failed to select a device for message: %.8x\n", diff --git a/drivers/firmware/imx/ele_common.h b/drivers/firmware/imx/ele_common.h index 5ef775a42ab3..7b1c6bfc138b 100644 --- a/drivers/firmware/imx/ele_common.h +++ b/drivers/firmware/imx/ele_common.h @@ -17,6 +17,10 @@ uint32_t se_add_msg_crc(uint32_t *msg, uint32_t msg_len); int ele_msg_rcv(struct se_if_priv *priv); int ele_msg_send(struct se_if_priv *priv, void *tx_msg); int ele_msg_send_rcv(struct se_if_priv *priv, void *tx_msg, void *rx_msg); +int ele_miscdev_msg_rcv(struct se_if_device_ctx *dev_ctx, + void *rx_msg, int rx_msg_sz); +int ele_miscdev_msg_send(struct se_if_device_ctx *dev_ctx, + void *tx_msg, int tx_msg_sz); void se_if_rx_callback(struct mbox_client *mbox_cl, void *msg); int se_val_rsp_hdr_n_status(struct se_if_priv *priv, struct se_msg_hdr *header, diff --git a/drivers/firmware/imx/se_ctrl.c b/drivers/firmware/imx/se_ctrl.c index a844794d2b39..8fb2af0f0dd3 100644 --- a/drivers/firmware/imx/se_ctrl.c +++ b/drivers/firmware/imx/se_ctrl.c @@ -23,6 +23,7 @@ #include <linux/slab.h> #include <linux/string.h> #include <linux/sys_soc.h> +#include <uapi/linux/se_ioctl.h> #include "ele_base_msg.h" #include "ele_common.h" @@ -196,6 +197,608 @@ static int se_soc_info(struct se_if_priv *priv, return 0; } +static int se_ioctl_cmd_snd_rcv_rsp_handler(struct se_if_device_ctx *dev_ctx, + u64 arg) +{ + struct se_if_priv *priv = dev_get_drvdata(dev_ctx->dev); + struct se_ioctl_cmd_snd_rcv_rsp_info cmd_snd_rcv_rsp_info; + struct se_api_msg *tx_msg __free(kfree) = NULL; + struct se_api_msg *rx_msg __free(kfree) = NULL; + int err = 0; + + if (copy_from_user(&cmd_snd_rcv_rsp_info, (u8 *)arg, + sizeof(cmd_snd_rcv_rsp_info))) { + dev_err(dev_ctx->priv->dev, + "%s: Failed to copy cmd_snd_rcv_rsp_info from user\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + + if (cmd_snd_rcv_rsp_info.tx_buf_sz < SE_MU_HDR_SZ) { + dev_err(dev_ctx->priv->dev, + "%s: User buffer too small(%d < %d)\n", + dev_ctx->miscdev.name, + cmd_snd_rcv_rsp_info.tx_buf_sz, + SE_MU_HDR_SZ); + err = -ENOSPC; + goto exit; + } + + rx_msg = kzalloc(cmd_snd_rcv_rsp_info.rx_buf_sz, GFP_KERNEL); + if (!rx_msg) { + err = -ENOMEM; + goto exit; + } + + tx_msg = memdup_user(cmd_snd_rcv_rsp_info.tx_buf, + cmd_snd_rcv_rsp_info.tx_buf_sz); + if (IS_ERR(tx_msg)) { + err = PTR_ERR(tx_msg); + goto exit; + } + + if (tx_msg->header.tag != priv->cmd_tag) { + err = -EINVAL; + goto exit; + } + + scoped_guard(mutex, &priv->se_if_cmd_lock); + priv->waiting_rsp_dev = dev_ctx; + dev_ctx->temp_resp_size = cmd_snd_rcv_rsp_info.rx_buf_sz; + + /* Device Context that is assigned to be a + * FW's command receiver, has pre-allocated buffer. + */ + if (dev_ctx != priv->cmd_receiver_dev) + dev_ctx->temp_resp = rx_msg; + + err = ele_miscdev_msg_send(dev_ctx, + tx_msg, + cmd_snd_rcv_rsp_info.tx_buf_sz); + if (err < 0) + goto exit; + + cmd_snd_rcv_rsp_info.tx_buf_sz = err; + + err = ele_miscdev_msg_rcv(dev_ctx, + cmd_snd_rcv_rsp_info.rx_buf, + cmd_snd_rcv_rsp_info.rx_buf_sz); + + if (err < 0) + goto exit; + + cmd_snd_rcv_rsp_info.rx_buf_sz = err; + +exit: + dev_ctx->temp_resp_size = 0; + priv->waiting_rsp_dev = NULL; + if (dev_ctx != priv->cmd_receiver_dev) + dev_ctx->temp_resp = NULL; + + if (copy_to_user((void *)arg, &cmd_snd_rcv_rsp_info, + sizeof(cmd_snd_rcv_rsp_info))) { + dev_err(dev_ctx->priv->dev, + "%s: Failed to copy cmd_snd_rcv_rsp_info from user\n", + dev_ctx->miscdev.name); + err = -EFAULT; + } + return err; +} + +/* + * File operations for user-space + */ + +/* Write a message to the MU. */ +static ssize_t se_if_fops_write(struct file *fp, const char __user *buf, + size_t size, loff_t *ppos) +{ + struct se_api_msg *tx_msg __free(kfree) = NULL; + struct se_if_device_ctx *dev_ctx; + struct se_if_priv *priv; + int err; + + dev_ctx = container_of(fp->private_data, + struct se_if_device_ctx, + miscdev); + priv = dev_ctx->priv; + dev_dbg(priv->dev, + "%s: write from buf (%p)%zu, ppos=%lld\n", + dev_ctx->miscdev.name, + buf, size, ((ppos) ? *ppos : 0)); + + if (down_interruptible(&dev_ctx->fops_lock)) + return -EBUSY; + + if (dev_ctx->status != SE_IF_CTX_OPENED) { + err = -EINVAL; + goto exit; + } + + if (size < SE_MU_HDR_SZ) { + dev_err(priv->dev, + "%s: User buffer too small(%zu < %d)\n", + dev_ctx->miscdev.name, + size, SE_MU_HDR_SZ); + err = -ENOSPC; + goto exit; + } + tx_msg = memdup_user(buf, size); + if (IS_ERR(tx_msg)) { + err = PTR_ERR(tx_msg); + goto exit; + } + + print_hex_dump_debug("from user ", DUMP_PREFIX_OFFSET, 4, 4, + tx_msg, size, false); + + err = ele_miscdev_msg_send(dev_ctx, tx_msg, size); + +exit: + up(&dev_ctx->fops_lock); + return err; +} + +/* + * Read a message from the MU. + * Blocking until a message is available. + */ +static ssize_t se_if_fops_read(struct file *fp, char __user *buf, + size_t size, loff_t *ppos) +{ + struct se_if_device_ctx *dev_ctx; + struct se_if_priv *priv; + int err; + + dev_ctx = container_of(fp->private_data, + struct se_if_device_ctx, + miscdev); + priv = dev_ctx->priv; + dev_dbg(priv->dev, + "%s: read to buf %p(%zu), ppos=%lld\n", + dev_ctx->miscdev.name, + buf, size, ((ppos) ? *ppos : 0)); + + if (down_interruptible(&dev_ctx->fops_lock)) + return -EBUSY; + + if (dev_ctx->status != SE_IF_CTX_OPENED) { + err = -EINVAL; + goto exit; + } + + err = ele_miscdev_msg_rcv(dev_ctx, buf, size); + +exit: + up(&dev_ctx->fops_lock); + return err; +} + +static int se_ioctl_get_mu_info(struct se_if_device_ctx *dev_ctx, + u64 arg) +{ + struct se_if_priv *priv = dev_get_drvdata(dev_ctx->dev); + struct se_if_node_info *if_node_info; + struct se_ioctl_get_if_info info; + int err = 0; + + if_node_info = (struct se_if_node_info *)priv->info; + + info.se_if_id = if_node_info->se_if_id; + info.interrupt_idx = 0; + info.tz = 0; + info.did = if_node_info->se_if_did; + info.cmd_tag = if_node_info->cmd_tag; + info.rsp_tag = if_node_info->rsp_tag; + info.success_tag = if_node_info->success_tag; + info.base_api_ver = if_node_info->base_api_ver; + info.fw_api_ver = if_node_info->fw_api_ver; + + dev_dbg(priv->dev, + "%s: info [se_if_id: %d, irq_idx: %d, tz: 0x%x, did: 0x%x]\n", + dev_ctx->miscdev.name, + info.se_if_id, info.interrupt_idx, info.tz, info.did); + + if (copy_to_user((u8 *)arg, &info, sizeof(info))) { + dev_err(dev_ctx->priv->dev, + "%s: Failed to copy mu info to user\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + +exit: + return err; +} + +/* Need to copy the output data to user-device context. + */ +int se_dev_ctx_cpy_out_data(struct se_if_device_ctx *dev_ctx, bool do_cpy) +{ + struct se_buf_desc *b_desc, *temp; + + list_for_each_entry_safe(b_desc, temp, &dev_ctx->pending_out, link) { + if (b_desc->usr_buf_ptr && b_desc->shared_buf_ptr && do_cpy) { + + dev_dbg(dev_ctx->dev, + "%s: Copy output data to user\n", + dev_ctx->miscdev.name); + if (copy_to_user(b_desc->usr_buf_ptr, + b_desc->shared_buf_ptr, + b_desc->size)) { + dev_err(dev_ctx->dev, + "%s: Failure copying output data to user.", + dev_ctx->miscdev.name); + return -EFAULT; + } + } + + if (b_desc->shared_buf_ptr) + memset(b_desc->shared_buf_ptr, 0, b_desc->size); + + list_del(&b_desc->link); + kfree(b_desc); + } + return 0; +} + +/* + * Clean the used Shared Memory space, + * whether its Input Data copied from user buffers, or + * Data received from FW. + */ +void se_dev_ctx_shared_mem_cleanup(struct se_if_device_ctx *dev_ctx) +{ + struct list_head *dev_ctx_lists[] = {&dev_ctx->pending_in, + &dev_ctx->pending_out}; + struct se_buf_desc *b_desc, *temp; + int i; + + for (i = 0; i < 2; i++) { + list_for_each_entry_safe(b_desc, temp, + dev_ctx_lists[i], link) { + + if (b_desc->shared_buf_ptr) + memset(b_desc->shared_buf_ptr, 0, b_desc->size); + + list_del(&b_desc->link); + kfree(b_desc); + } + } +} + +/* + * Copy a buffer of data to/from the user and return the address to use in + * messages + */ +static int se_ioctl_setup_iobuf_handler(struct se_if_device_ctx *dev_ctx, + u64 arg) +{ + struct se_shared_mem *shared_mem = NULL; + struct se_ioctl_setup_iobuf io = {0}; + struct se_buf_desc *b_desc = NULL; + int err = 0; + u32 pos; + + if (copy_from_user(&io, (u8 *)arg, sizeof(io))) { + dev_err(dev_ctx->priv->dev, + "%s: Failed copy iobuf config from user\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + + dev_dbg(dev_ctx->priv->dev, + "%s: io [buf: %p(%d) flag: %x]\n", + dev_ctx->miscdev.name, + io.user_buf, io.length, io.flags); + + if (io.length == 0 || !io.user_buf) { + /* + * Accept NULL pointers since some buffers are optional + * in FW commands. In this case we should return 0 as + * pointer to be embedded into the message. + * Skip all data copy part of code below. + */ + io.ele_addr = 0; + goto copy; + } + + /* Select the shared memory to be used for this buffer. */ + if (io.flags & SE_MU_IO_FLAGS_USE_SEC_MEM) { + /* App requires to use secure memory for this buffer.*/ + dev_err(dev_ctx->priv->dev, + "%s: Failed allocate SEC MEM memory\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } else { + /* No specific requirement for this buffer. */ + shared_mem = &dev_ctx->non_secure_mem; + } + + /* Check there is enough space in the shared memory. */ + if (shared_mem->size < shared_mem->pos || + round_up(io.length, 8u) >= (shared_mem->size - shared_mem->pos)) { + dev_err(dev_ctx->priv->dev, + "%s: Not enough space in shared memory\n", + dev_ctx->miscdev.name); + err = -ENOMEM; + goto exit; + } + + /* Allocate space in shared memory. 8 bytes aligned. */ + pos = shared_mem->pos; + shared_mem->pos += round_up(io.length, 8u); + io.ele_addr = (u64)shared_mem->dma_addr + pos; + + if ((io.flags & SE_MU_IO_FLAGS_USE_SEC_MEM) && + !(io.flags & SE_MU_IO_FLAGS_USE_SHORT_ADDR)) { + /*Add base address to get full address.*/ + dev_err(dev_ctx->priv->dev, + "%s: Failed allocate SEC MEM memory\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + + memset(shared_mem->ptr + pos, 0, io.length); + if ((io.flags & SE_IO_BUF_FLAGS_IS_INPUT) || + (io.flags & SE_IO_BUF_FLAGS_IS_IN_OUT)) { + /* + * buffer is input: + * copy data from user space to this allocated buffer. + */ + if (copy_from_user(shared_mem->ptr + pos, io.user_buf, + io.length)) { + dev_err(dev_ctx->priv->dev, + "%s: Failed copy data to shared memory\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + } + + b_desc = kzalloc(sizeof(*b_desc), GFP_KERNEL); + if (!b_desc) { + err = -ENOMEM; + goto exit; + } + +copy: + /* Provide the EdgeLock Enclave address to user space only if success.*/ + if (copy_to_user((u8 *)arg, &io, sizeof(io))) { + dev_err(dev_ctx->priv->dev, + "%s: Failed to copy iobuff setup to user\n", + dev_ctx->miscdev.name); + kfree(b_desc); + err = -EFAULT; + goto exit; + } + + if (b_desc) { + b_desc->shared_buf_ptr = shared_mem->ptr + pos; + b_desc->usr_buf_ptr = io.user_buf; + b_desc->size = io.length; + + if (io.flags & SE_IO_BUF_FLAGS_IS_INPUT) { + /* + * buffer is input: + * add an entry in the "pending input buffers" list so + * that copied data can be cleaned from shared memory + * later. + */ + list_add_tail(&b_desc->link, &dev_ctx->pending_in); + } else { + /* + * buffer is output: + * add an entry in the "pending out buffers" list so data + * can be copied to user space when receiving Secure-Enclave + * response. + */ + list_add_tail(&b_desc->link, &dev_ctx->pending_out); + } + } + +exit: + return err; +} + +/* IOCTL to provide SoC information */ +static int se_ioctl_get_se_soc_info_handler(struct se_if_device_ctx *dev_ctx, + u64 arg) +{ + const struct se_if_node_info_list *info_list; + struct se_ioctl_get_soc_info soc_info; + int err = -EINVAL; + + info_list = device_get_match_data(dev_ctx->priv->dev); + if (!info_list) + goto exit; + + soc_info.soc_id = info_list->soc_id; + soc_info.soc_rev = dev_ctx->priv->soc_rev; + + err = (int)copy_to_user((u8 *)arg, (u8 *)(&soc_info), sizeof(soc_info)); + if (err) { + dev_err(dev_ctx->priv->dev, + "%s: Failed to copy soc info to user\n", + dev_ctx->miscdev.name); + err = -EFAULT; + goto exit; + } + +exit: + return err; +} + +/* Open a character device. */ +static int se_if_fops_open(struct inode *nd, struct file *fp) +{ + struct se_if_device_ctx *dev_ctx = container_of(fp->private_data, + struct se_if_device_ctx, + miscdev); + int err = 0; + + /* Avoid race if opened at the same time */ + if (down_trylock(&dev_ctx->fops_lock)) + return -EBUSY; + + /* Authorize only 1 instance. */ + if (dev_ctx->status != SE_IF_CTX_FREE) { + err = -EBUSY; + goto exit; + } + + /* + * Allocate some memory for data exchanges with S40x. + * This will be used for data not requiring secure memory. + */ + dev_ctx->non_secure_mem.ptr = dmam_alloc_coherent(dev_ctx->dev, + MAX_DATA_SIZE_PER_USER, + &dev_ctx->non_secure_mem.dma_addr, + GFP_KERNEL); + if (!dev_ctx->non_secure_mem.ptr) { + err = -ENOMEM; + goto exit; + } + + dev_ctx->non_secure_mem.size = MAX_DATA_SIZE_PER_USER; + dev_ctx->non_secure_mem.pos = 0; + dev_ctx->status = SE_IF_CTX_OPENED; + + dev_ctx->pending_hdr = 0; + + goto exit; + + dmam_free_coherent(dev_ctx->priv->dev, MAX_DATA_SIZE_PER_USER, + dev_ctx->non_secure_mem.ptr, + dev_ctx->non_secure_mem.dma_addr); + +exit: + up(&dev_ctx->fops_lock); + return err; +} + +/* Close a character device. */ +static int se_if_fops_close(struct inode *nd, struct file *fp) +{ + struct se_if_device_ctx *dev_ctx = container_of(fp->private_data, + struct se_if_device_ctx, + miscdev); + struct se_if_priv *priv = dev_ctx->priv; + + /* Avoid race if closed at the same time */ + if (down_trylock(&dev_ctx->fops_lock)) + return -EBUSY; + + /* The device context has not been opened */ + if (dev_ctx->status != SE_IF_CTX_OPENED) + goto exit; + + /* check if this device was registered as command receiver. */ + if (priv->cmd_receiver_dev == dev_ctx) { + priv->cmd_receiver_dev = NULL; + kfree(dev_ctx->temp_resp); + } + + /* check if this device was registered as waiting response. */ + if (priv->waiting_rsp_dev == dev_ctx) { + priv->waiting_rsp_dev = NULL; + mutex_unlock(&priv->se_if_cmd_lock); + } + + /* Unmap secure memory shared buffer. */ + if (dev_ctx->secure_mem.ptr) + devm_iounmap(dev_ctx->dev, dev_ctx->secure_mem.ptr); + + dev_ctx->secure_mem.ptr = NULL; + dev_ctx->secure_mem.dma_addr = 0; + dev_ctx->secure_mem.size = 0; + dev_ctx->secure_mem.pos = 0; + + /* Free non-secure shared buffer. */ + dmam_free_coherent(dev_ctx->priv->dev, MAX_DATA_SIZE_PER_USER, + dev_ctx->non_secure_mem.ptr, + dev_ctx->non_secure_mem.dma_addr); + + dev_ctx->non_secure_mem.ptr = NULL; + dev_ctx->non_secure_mem.dma_addr = 0; + dev_ctx->non_secure_mem.size = 0; + dev_ctx->non_secure_mem.pos = 0; + se_dev_ctx_shared_mem_cleanup(dev_ctx); + dev_ctx->status = SE_IF_CTX_FREE; + +exit: + up(&dev_ctx->fops_lock); + return 0; +} + +/* IOCTL entry point of a character device */ +static long se_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) +{ + struct se_if_device_ctx *dev_ctx = container_of(fp->private_data, + struct se_if_device_ctx, + miscdev); + struct se_if_priv *se_if_priv = dev_ctx->priv; + int err = -EINVAL; + + /* Prevent race during change of device context */ + if (down_interruptible(&dev_ctx->fops_lock)) + return -EBUSY; + + switch (cmd) { + case SE_IOCTL_ENABLE_CMD_RCV: + if (!se_if_priv->cmd_receiver_dev) { + err = 0; + se_if_priv->cmd_receiver_dev = dev_ctx; + dev_ctx->temp_resp = kzalloc(MAX_NVM_MSG_LEN, GFP_KERNEL); + if (!dev_ctx->temp_resp) + err = -ENOMEM; + } + break; + case SE_IOCTL_GET_MU_INFO: + err = se_ioctl_get_mu_info(dev_ctx, arg); + break; + case SE_IOCTL_SETUP_IOBUF: + err = se_ioctl_setup_iobuf_handler(dev_ctx, arg); + break; + case SE_IOCTL_GET_SOC_INFO: + err = se_ioctl_get_se_soc_info_handler(dev_ctx, arg); + break; + case SE_IOCTL_CMD_SEND_RCV_RSP: + err = se_ioctl_cmd_snd_rcv_rsp_handler(dev_ctx, arg); + break; + + default: + err = -EINVAL; + dev_dbg(se_if_priv->dev, + "%s: IOCTL %.8x not supported\n", + dev_ctx->miscdev.name, + cmd); + } + + up(&dev_ctx->fops_lock); + return (long)err; +} + +/* Char driver setup */ +static const struct file_operations se_if_fops = { + .open = se_if_fops_open, + .owner = THIS_MODULE, + .release = se_if_fops_close, + .unlocked_ioctl = se_ioctl, + .read = se_if_fops_read, + .write = se_if_fops_write, +}; + +/* interface for managed res to unregister a character device */ +static void if_misc_deregister(void *miscdevice) +{ + misc_deregister(miscdevice); +} + /* interface for managed res to free a mailbox channel */ static void if_mbox_free_channel(void *mbox_chan) { @@ -233,6 +836,7 @@ static void se_if_probe_cleanup(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct se_if_priv *priv; + int i; priv = dev_get_drvdata(dev); @@ -252,6 +856,17 @@ static void se_if_probe_cleanup(struct platform_device *pdev) priv->imem.buf = NULL; } + if (priv->ctxs) { + for (i = 0; i < priv->max_dev_ctx; i++) { + if (priv->ctxs[i]) { + devm_remove_action(dev, + if_misc_deregister, + &priv->ctxs[i]->miscdev); + misc_deregister(&priv->ctxs[i]->miscdev); + } + } + } + /* No need to check, if reserved memory is allocated * before calling for its release. Or clearing the * un-set bit. @@ -259,6 +874,74 @@ static void se_if_probe_cleanup(struct platform_device *pdev) of_reserved_mem_device_release(dev); } +static int init_device_context(struct se_if_priv *priv) +{ + const struct se_if_node_info *info = priv->info; + struct se_if_device_ctx *dev_ctx; + u8 *devname; + int ret = 0; + int i; + + priv->ctxs = devm_kzalloc(priv->dev, sizeof(dev_ctx) * priv->max_dev_ctx, + GFP_KERNEL); + + if (!priv->ctxs) { + ret = -ENOMEM; + return ret; + } + + /* Create users */ + for (i = 0; i < priv->max_dev_ctx; i++) { + dev_ctx = devm_kzalloc(priv->dev, sizeof(*dev_ctx), GFP_KERNEL); + if (!dev_ctx) { + ret = -ENOMEM; + return ret; + } + + dev_ctx->dev = priv->dev; + dev_ctx->status = SE_IF_CTX_FREE; + dev_ctx->priv = priv; + + priv->ctxs[i] = dev_ctx; + + /* Default value invalid for an header. */ + init_waitqueue_head(&dev_ctx->wq); + + INIT_LIST_HEAD(&dev_ctx->pending_out); + INIT_LIST_HEAD(&dev_ctx->pending_in); + sema_init(&dev_ctx->fops_lock, 1); + + devname = devm_kasprintf(priv->dev, GFP_KERNEL, "%s_ch%d", + info->se_name, i); + if (!devname) { + ret = -ENOMEM; + return ret; + } + + dev_ctx->miscdev.name = devname; + dev_ctx->miscdev.minor = MISC_DYNAMIC_MINOR; + dev_ctx->miscdev.fops = &se_if_fops; + dev_ctx->miscdev.parent = priv->dev; + ret = misc_register(&dev_ctx->miscdev); + if (ret) { + dev_err(priv->dev, "failed to register misc device %d\n", + ret); + return ret; + } + + ret = devm_add_action(priv->dev, if_misc_deregister, + &dev_ctx->miscdev); + if (ret) { + dev_err(priv->dev, + "failed[%d] to add action to the misc-dev\n", + ret); + return ret; + } + } + + return ret; +} + static void se_load_firmware(const struct firmware *fw, void *context) { struct se_if_priv *priv = (struct se_if_priv *) context; @@ -427,6 +1110,16 @@ static int se_if_probe(struct platform_device *pdev) ret = 0; } + if (info->max_dev_ctx) { + ret = init_device_context(priv); + if (ret) { + dev_err(dev, + "Failed[0x%x] to create device contexts.\n", + ret); + goto exit; + } + } + dev_info(dev, "i.MX secure-enclave: %s interface to firmware, configured.\n", info->se_name); return ret; @@ -467,6 +1160,10 @@ static int se_resume(struct device *dev) { struct se_if_priv *priv = dev_get_drvdata(dev); const struct se_if_node_info *info = priv->info; + int i; + + for (i = 0; i < priv->max_dev_ctx; i++) + wake_up_interruptible(&priv->ctxs[i]->wq); if (info && info->imem_mgmt) se_restore_imem_state(priv); diff --git a/drivers/firmware/imx/se_ctrl.h b/drivers/firmware/imx/se_ctrl.h index 4be2235d2170..b49346372746 100644 --- a/drivers/firmware/imx/se_ctrl.h +++ b/drivers/firmware/imx/se_ctrl.h @@ -13,15 +13,62 @@ #define MAX_FW_LOAD_RETRIES 50 #define RES_STATUS(x) FIELD_GET(0x000000ff, x) +#define MAX_DATA_SIZE_PER_USER (65 * 1024) +#define MAX_NVM_MSG_LEN (256) #define MESSAGING_VERSION_6 0x6 #define MESSAGING_VERSION_7 0x7 +#define SE_MU_IO_FLAGS_USE_SEC_MEM (0x02u) +#define SE_MU_IO_FLAGS_USE_SHORT_ADDR (0x04u) + struct se_imem_buf { u8 *buf; phys_addr_t phyaddr; u32 size; }; +struct se_buf_desc { + u8 *shared_buf_ptr; + u8 *usr_buf_ptr; + u32 size; + struct list_head link; +}; + +/* Status of a char device */ +enum se_if_dev_ctx_status_t { + SE_IF_CTX_FREE, + SE_IF_CTX_OPENED +}; + +struct se_shared_mem { + dma_addr_t dma_addr; + u32 size; + u32 pos; + u8 *ptr; +}; + +/* Private struct for each char device instance. */ +struct se_if_device_ctx { + struct device *dev; + struct se_if_priv *priv; + struct miscdevice miscdev; + + enum se_if_dev_ctx_status_t status; + wait_queue_head_t wq; + struct semaphore fops_lock; + + u32 pending_hdr; + struct list_head pending_in; + struct list_head pending_out; + + struct se_shared_mem secure_mem; + struct se_shared_mem non_secure_mem; + + struct se_api_msg *temp_resp; + u32 temp_resp_size; + struct notifier_block se_notify; +}; + /* Header of the messages exchange with the EdgeLock Enclave */ struct se_msg_hdr { u8 ver; @@ -80,4 +127,6 @@ struct se_if_priv { struct se_imem_buf imem; }; +int se_dev_ctx_cpy_out_data(struct se_if_device_ctx *dev_ctx, bool do_cpy); +void se_dev_ctx_shared_mem_cleanup(struct se_if_device_ctx *dev_ctx); #endif diff --git a/include/uapi/linux/se_ioctl.h b/include/uapi/linux/se_ioctl.h new file mode 100644 index 000000000000..c2d0a92ef626 --- /dev/null +++ b/include/uapi/linux/se_ioctl.h @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause*/ +/* + * Copyright 2024 NXP + */ + +#ifndef SE_IOCTL_H +#define SE_IOCTL_H + +/* IOCTL definitions. */ + +struct se_ioctl_setup_iobuf { + u8 *user_buf; + u32 length; + u32 flags; + u64 ele_addr; +}; + +struct se_ioctl_shared_mem_cfg { + u32 base_offset; + u32 size; +}; + +struct se_ioctl_get_if_info { + u8 se_if_id; + u8 interrupt_idx; + u8 tz; + u8 did; + u8 cmd_tag; + u8 rsp_tag; + u8 success_tag; + u8 base_api_ver; + u8 fw_api_ver; +}; + +struct se_ioctl_cmd_snd_rcv_rsp_info { + u32 *tx_buf; + int tx_buf_sz; + u32 *rx_buf; + int rx_buf_sz; +}; + +struct se_ioctl_get_soc_info { + u16 soc_id; + u16 soc_rev; +}; + +/* IO Buffer Flags */ +#define SE_IO_BUF_FLAGS_IS_OUTPUT (0x00u) +#define SE_IO_BUF_FLAGS_IS_INPUT (0x01u) +#define SE_IO_BUF_FLAGS_USE_SEC_MEM (0x02u) +#define SE_IO_BUF_FLAGS_USE_SHORT_ADDR (0x04u) +#define SE_IO_BUF_FLAGS_IS_IN_OUT (0x10u) + +/* IOCTLS */ +#define SE_IOCTL 0x0A /* like MISC_MAJOR. */ + +/* + * ioctl to designated the current fd as logical-reciever. + * This is ioctl is send when the nvm-daemon, a slave to the + * firmware is started by the user. + */ +#define SE_IOCTL_ENABLE_CMD_RCV _IO(SE_IOCTL, 0x01) + +/* + * ioctl to get the buffer allocated from the memory, which is shared + * between kernel and FW. + * Post allocation, the kernel tagged the allocated memory with: + * Output + * Input + * Input-Output + * Short address + * Secure-memory + */ +#define SE_IOCTL_SETUP_IOBUF _IOWR(SE_IOCTL, 0x03, \ + struct se_ioctl_setup_iobuf) + +/* + * ioctl to get the mu information, that is used to exchange message + * with FW, from user-spaced. + */ +#define SE_IOCTL_GET_MU_INFO _IOR(SE_IOCTL, 0x04, \ + struct se_ioctl_get_if_info) +/* + * ioctl to get SoC Info from user-space. + */ +#define SE_IOCTL_GET_SOC_INFO _IOR(SE_IOCTL, 0x06, \ + struct se_ioctl_get_soc_info) + +/* + * ioctl to send command and receive response from user-space. + */ +#define SE_IOCTL_CMD_SEND_RCV_RSP _IOWR(SE_IOCTL, 0x07, \ + struct se_ioctl_cmd_snd_rcv_rsp_info) +#endif -- 2.34.1
