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Due to this, firmware's functionaity cannot work correctly. Saving encrypted IMEM region in kernel memory during power down, and restore IMEM region on resume. Signed-off-by: Gaurav Jain Signed-off-by: Pankaj Gupta --- drivers/firmware/imx/ele_base_msg.c | 53 ++++++++++ drivers/firmware/imx/ele_common.c | 115 ++++++++++++++++++++++ drivers/firmware/imx/ele_common.h | 8 ++ drivers/firmware/imx/se_fw.c | 36 +++++++ include/linux/firmware/imx/ele_base_msg.h | 14 +++ 5 files changed, 226 insertions(+) diff --git a/drivers/firmware/imx/ele_base_msg.c b/drivers/firmware/imx/ele_base_msg.c index 3a3af2321f67..844bb0e54c02 100644 --- a/drivers/firmware/imx/ele_base_msg.c +++ b/drivers/firmware/imx/ele_base_msg.c @@ -216,3 +216,56 @@ int ele_start_rng(struct device *dev) return ret; } + +int ele_service_swap(struct device *dev, + phys_addr_t addr, + u32 addr_size, u16 flag) +{ + struct ele_mu_priv *priv = dev_get_drvdata(dev); + int ret; + unsigned int status; + + ret = imx_se_alloc_tx_rx_buf(priv); + if (ret) + return ret; + + ret = plat_fill_cmd_msg_hdr(priv, + (struct mu_hdr *)&priv->tx_msg->header, + ELE_SERVICE_SWAP_REQ, + ELE_SERVICE_SWAP_REQ_MSG_SZ, + true); + if (ret) + return ret; + + priv->tx_msg->data[0] = flag; + priv->tx_msg->data[1] = addr_size; + priv->tx_msg->data[2] = ELE_NONE_VAL; + priv->tx_msg->data[3] = lower_32_bits(addr); + priv->tx_msg->data[4] = plat_add_msg_crc((uint32_t *)&priv->tx_msg[0], + ELE_SERVICE_SWAP_REQ_MSG_SZ); + ret = imx_ele_msg_send_rcv(priv); + if (ret < 0) + return ret; + + ret = validate_rsp_hdr(priv, + priv->rx_msg->header, + ELE_SERVICE_SWAP_REQ, + ELE_SERVICE_SWAP_RSP_MSG_SZ, + true); + if (ret) + return ret; + + status = RES_STATUS(priv->rx_msg->data[0]); + if (status != priv->success_tag) { + dev_err(dev, "Command Id[%d], Response Failure = 0x%x", + ELE_SERVICE_SWAP_REQ, status); + ret = -1; + } else { + if (flag == ELE_IMEM_EXPORT) + ret = priv->rx_msg->data[1]; + else + ret = 0; + } + + return ret; +} diff --git a/drivers/firmware/imx/ele_common.c b/drivers/firmware/imx/ele_common.c index d4b829c19133..348f7194778f 100644 --- a/drivers/firmware/imx/ele_common.c +++ b/drivers/firmware/imx/ele_common.c @@ -45,6 +45,18 @@ void imx_se_free_tx_rx_buf(struct ele_mu_priv *priv) devm_kfree(priv->dev, priv->rx_msg); } +uint32_t plat_add_msg_crc(uint32_t *msg, uint32_t msg_len) +{ + uint32_t i; + uint32_t crc = 0; + uint32_t nb_words = msg_len / (uint32_t)sizeof(uint32_t); + + for (i = 0; i < nb_words - 1; i++) + crc ^= *(msg + i); + + return crc; +} + int imx_ele_msg_send_rcv(struct ele_mu_priv *priv) { unsigned int wait; @@ -177,3 +189,106 @@ int ele_do_start_rng(struct device *dev) return 0; } + +#ifdef CONFIG_PM_SLEEP +int save_imem(struct device *dev) +{ + int ret; + struct ele_mu_priv *priv = dev_get_drvdata(dev); + + /* EXPORT command will save encrypted IMEM to given address, + * so later in resume, IMEM can be restored from the given + * address. + * + * Size must be at least 64 kB. + */ + ret = ele_service_swap(dev, + priv->imem.phyaddr, + ELE_IMEM_SIZE, + ELE_IMEM_EXPORT); + if (ret < 0) + dev_err(dev, "Failed to export IMEM\n"); + else + dev_info(dev, + "Exported %d bytes of encrypted IMEM\n", + ret); + + return ret; +} + +int restore_imem(struct device *dev, + uint8_t *pool_name) +{ + int ret; + u32 imem_state; + u32 *get_info_buf = NULL; + phys_addr_t get_info_phyaddr = 0; + struct ele_mu_priv *priv = dev_get_drvdata(dev); + + get_info_phyaddr + = pool_name ? get_phy_buf_mem_pool(dev, + pool_name, + &get_info_buf, + DEVICE_GET_INFO_SZ) + : 0x0; + + if (!get_info_buf) { + dev_err(dev, "Unable to alloc sram from sram pool\n"); + return -ENOMEM; + } + + ret = ele_do_start_rng(dev); + if (ret) + goto exit; + + /* get info from ELE */ + ret = ele_get_info(dev, get_info_phyaddr, ELE_GET_INFO_READ_SZ); + if (ret) { + dev_err(dev, "Failed to get info from ELE.\n"); + goto exit; + } + + /* Get IMEM state, if 0xFE then import IMEM */ + imem_state = (get_info_buf[ELE_IMEM_STATE_WORD] + & ELE_IMEM_STATE_MASK) >> 16; + if (imem_state == ELE_IMEM_STATE_BAD) { + /* IMPORT command will restore IMEM from the given + * address, here size is the actual size returned by ELE + * during the export operation + */ + ret = ele_service_swap(dev, + priv->imem.phyaddr, + priv->imem.size, + ELE_IMEM_IMPORT); + if (ret) { + dev_err(dev, "Failed to import IMEM\n"); + goto exit; + } + } else + goto exit; + + /* After importing IMEM, check if IMEM state is equal to 0xCA + * to ensure IMEM is fully loaded and + * ELE functionality can be used. + */ + ret = ele_get_info(dev, get_info_phyaddr, ELE_GET_INFO_READ_SZ); + if (ret) { + dev_err(dev, "Failed to get info from ELE.\n"); + goto exit; + } + + imem_state = (get_info_buf[ELE_IMEM_STATE_WORD] + & ELE_IMEM_STATE_MASK) >> 16; + if (imem_state == ELE_IMEM_STATE_OK) + dev_info(dev, "Successfully restored IMEM\n"); + else + dev_err(dev, "Failed to restore IMEM\n"); + +exit: + if (pool_name && get_info_buf) + free_phybuf_mem_pool(dev, pool_name, + get_info_buf, DEVICE_GET_INFO_SZ); + + return ret; +} +#endif diff --git a/drivers/firmware/imx/ele_common.h b/drivers/firmware/imx/ele_common.h index f9e1d949dc6a..e1979b555b58 100644 --- a/drivers/firmware/imx/ele_common.h +++ b/drivers/firmware/imx/ele_common.h @@ -9,6 +9,7 @@ #include "se_fw.h" +uint32_t plat_add_msg_crc(uint32_t *msg, uint32_t msg_len); int imx_ele_msg_send_rcv(struct ele_mu_priv *priv); void imx_se_free_tx_rx_buf(struct ele_mu_priv *priv); int imx_se_alloc_tx_rx_buf(struct ele_mu_priv *priv); @@ -29,4 +30,11 @@ static inline int ele_trng_init(struct device *dev) #endif int ele_do_start_rng(struct device *dev); + +#ifdef CONFIG_PM_SLEEP +int save_imem(struct device *dev); +int restore_imem(struct device *dev, + uint8_t *pool_name); #endif + +#endif /*__ELE_COMMON_H__ */ diff --git a/drivers/firmware/imx/se_fw.c b/drivers/firmware/imx/se_fw.c index 3638a4fed5e7..db992b3cceb9 100644 --- a/drivers/firmware/imx/se_fw.c +++ b/drivers/firmware/imx/se_fw.c @@ -52,6 +52,7 @@ struct imx_info { /* platform specific flag to enable/disable the ELE True RNG */ bool start_rng; bool enable_ele_trng; + bool imem_mgmt; }; struct imx_info_list { @@ -82,6 +83,7 @@ static const struct imx_info_list imx8ulp_info = { .init_fw = false, .start_rng = true, .enable_ele_trng = false, + .imem_mgmt = true, }, }, }; @@ -107,6 +109,7 @@ static const struct imx_info_list imx93_info = { .init_fw = true, .start_rng = true, .enable_ele_trng = true, + .imem_mgmt = false, }, }, }; @@ -1062,6 +1065,17 @@ static int se_probe_cleanup(struct platform_device *pdev) if (priv->rx_chan) mbox_free_channel(priv->rx_chan); + /* free the buffer in ele-mu remove, previously allocated + * in ele-mu probe to store encrypted IMEM + */ + if (priv->imem.buf) { + dmam_free_coherent(&pdev->dev, + ELE_IMEM_SIZE, + priv->imem.buf, + priv->imem.phyaddr); + priv->imem.buf = NULL; + } + if (priv->flags & RESERVED_DMA_POOL) { of_reserved_mem_device_release(dev); priv->flags &= (~RESERVED_DMA_POOL); @@ -1281,6 +1295,18 @@ static int se_fw_probe(struct platform_device *pdev) dev_err(dev, "Failed to init ele-trng\n"); } + if (info->imem_mgmt) { + /* allocate buffer where ELE store encrypted IMEM */ + priv->imem.buf = dmam_alloc_coherent(dev, ELE_IMEM_SIZE, + &priv->imem.phyaddr, + GFP_KERNEL); + if (!priv->imem.buf) { + dev_err(dev, + "dmam-alloc-failed: To store encr-IMEM.\n"); + ret = -ENOMEM; + goto exit; + } + } dev_info(dev, "i.MX secure-enclave: %s interface to firmware, configured.\n", info->pdev_name[1]); @@ -1303,17 +1329,27 @@ static int se_fw_remove(struct platform_device *pdev) #ifdef CONFIG_PM_SLEEP static int se_fw_suspend(struct device *dev) { + struct ele_mu_priv *priv = dev_get_drvdata(dev); + const struct imx_info *info = priv->info; + + if (info && info->imem_mgmt) + priv->imem.size = save_imem(dev); + return 0; } static int se_fw_resume(struct device *dev) { struct ele_mu_priv *priv = dev_get_drvdata(dev); + const struct imx_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) + restore_imem(dev, info->pool_name); + return 0; } #endif diff --git a/include/linux/firmware/imx/ele_base_msg.h b/include/linux/firmware/imx/ele_base_msg.h index 3ca4b47e4c4e..f027f687de2e 100644 --- a/include/linux/firmware/imx/ele_base_msg.h +++ b/include/linux/firmware/imx/ele_base_msg.h @@ -45,9 +45,23 @@ #define ELE_GET_TRNG_STATE_RETRY_COUNT 0x5 #define CSAL_TRNG_STATE_MASK 0x0000ffff +#define ELE_SERVICE_SWAP_REQ 0xDF +#define ELE_SERVICE_SWAP_REQ_MSG_SZ 0x18 +#define ELE_SERVICE_SWAP_RSP_MSG_SZ 0x0C +#define ELE_IMEM_SIZE 0x10000 +#define ELE_IMEM_STATE_OK 0xCA +#define ELE_IMEM_STATE_BAD 0xFE +#define ELE_IMEM_STATE_WORD 0x27 +#define ELE_IMEM_STATE_MASK 0x00ff0000 +#define ELE_IMEM_EXPORT 0x1 +#define ELE_IMEM_IMPORT 0x2 + int ele_get_info(struct device *dev, phys_addr_t addr, u32 data_size); int ele_ping(struct device *dev); int ele_start_rng(struct device *dev); int ele_get_trng_state(struct device *dev); +int ele_service_swap(struct device *dev, + phys_addr_t addr, + u32 addr_size, u16 flag); #endif