287 lines
6.8 KiB
C
287 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2019 Broadcom.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include <linux/uuid.h>
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#include <linux/firmware/broadcom/tee_bnxt_fw.h>
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#define MAX_SHM_MEM_SZ SZ_4M
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#define MAX_TEE_PARAM_ARRY_MEMB 4
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enum ta_cmd {
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/*
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* TA_CMD_BNXT_FASTBOOT - boot bnxt device by copying f/w into sram
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*
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* param[0] unused
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* param[1] unused
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* param[2] unused
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* param[3] unused
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*
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* Result:
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* TEE_SUCCESS - Invoke command success
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* TEE_ERROR_ITEM_NOT_FOUND - Corrupt f/w image found on memory
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*/
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TA_CMD_BNXT_FASTBOOT = 0,
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/*
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* TA_CMD_BNXT_COPY_COREDUMP - copy the core dump into shm
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*
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* param[0] (inout memref) - Coredump buffer memory reference
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* param[1] (in value) - value.a: offset, data to be copied from
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* value.b: size of data to be copied
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* param[2] unused
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* param[3] unused
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*
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* Result:
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* TEE_SUCCESS - Invoke command success
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* TEE_ERROR_BAD_PARAMETERS - Incorrect input param
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* TEE_ERROR_ITEM_NOT_FOUND - Corrupt core dump
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*/
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TA_CMD_BNXT_COPY_COREDUMP = 3,
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};
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/**
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* struct tee_bnxt_fw_private - OP-TEE bnxt private data
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* @dev: OP-TEE based bnxt device.
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* @ctx: OP-TEE context handler.
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* @session_id: TA session identifier.
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*/
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struct tee_bnxt_fw_private {
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struct device *dev;
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struct tee_context *ctx;
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u32 session_id;
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struct tee_shm *fw_shm_pool;
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};
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static struct tee_bnxt_fw_private pvt_data;
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static void prepare_args(int cmd,
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struct tee_ioctl_invoke_arg *arg,
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struct tee_param *param)
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{
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memset(arg, 0, sizeof(*arg));
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memset(param, 0, MAX_TEE_PARAM_ARRY_MEMB * sizeof(*param));
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arg->func = cmd;
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arg->session = pvt_data.session_id;
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arg->num_params = MAX_TEE_PARAM_ARRY_MEMB;
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/* Fill invoke cmd params */
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switch (cmd) {
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case TA_CMD_BNXT_COPY_COREDUMP:
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param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
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param[0].u.memref.shm = pvt_data.fw_shm_pool;
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param[0].u.memref.size = MAX_SHM_MEM_SZ;
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param[0].u.memref.shm_offs = 0;
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param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
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break;
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case TA_CMD_BNXT_FASTBOOT:
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default:
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/* Nothing to do */
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break;
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}
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}
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/**
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* tee_bnxt_fw_load() - Load the bnxt firmware
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* Uses an OP-TEE call to start a secure
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* boot process.
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* Returns 0 on success, negative errno otherwise.
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*/
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int tee_bnxt_fw_load(void)
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{
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int ret = 0;
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struct tee_ioctl_invoke_arg arg;
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struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB];
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if (!pvt_data.ctx)
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return -ENODEV;
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prepare_args(TA_CMD_BNXT_FASTBOOT, &arg, param);
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ret = tee_client_invoke_func(pvt_data.ctx, &arg, param);
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if (ret < 0 || arg.ret != 0) {
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dev_err(pvt_data.dev,
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"TA_CMD_BNXT_FASTBOOT invoke failed TEE err: %x, ret:%x\n",
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arg.ret, ret);
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL(tee_bnxt_fw_load);
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/**
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* tee_bnxt_copy_coredump() - Copy coredump from the allocated memory
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* Uses an OP-TEE call to copy coredump
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* @buf: destination buffer where core dump is copied into
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* @offset: offset from the base address of core dump area
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* @size: size of the dump
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*
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* Returns 0 on success, negative errno otherwise.
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*/
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int tee_bnxt_copy_coredump(void *buf, u32 offset, u32 size)
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{
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struct tee_ioctl_invoke_arg arg;
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struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB];
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void *core_data;
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u32 rbytes = size;
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u32 nbytes = 0;
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int ret = 0;
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if (!pvt_data.ctx)
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return -ENODEV;
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prepare_args(TA_CMD_BNXT_COPY_COREDUMP, &arg, param);
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while (rbytes) {
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nbytes = rbytes;
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nbytes = min_t(u32, rbytes, param[0].u.memref.size);
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/* Fill additional invoke cmd params */
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param[1].u.value.a = offset;
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param[1].u.value.b = nbytes;
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ret = tee_client_invoke_func(pvt_data.ctx, &arg, param);
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if (ret < 0 || arg.ret != 0) {
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dev_err(pvt_data.dev,
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"TA_CMD_BNXT_COPY_COREDUMP invoke failed TEE err: %x, ret:%x\n",
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arg.ret, ret);
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return -EINVAL;
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}
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core_data = tee_shm_get_va(pvt_data.fw_shm_pool, 0);
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if (IS_ERR(core_data)) {
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dev_err(pvt_data.dev, "tee_shm_get_va failed\n");
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return PTR_ERR(core_data);
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}
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memcpy(buf, core_data, nbytes);
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rbytes -= nbytes;
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buf += nbytes;
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offset += nbytes;
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}
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return 0;
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}
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EXPORT_SYMBOL(tee_bnxt_copy_coredump);
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static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
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{
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return (ver->impl_id == TEE_IMPL_ID_OPTEE);
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}
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static int tee_bnxt_fw_probe(struct device *dev)
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{
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struct tee_client_device *bnxt_device = to_tee_client_device(dev);
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int ret, err = -ENODEV;
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struct tee_ioctl_open_session_arg sess_arg;
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struct tee_shm *fw_shm_pool;
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memset(&sess_arg, 0, sizeof(sess_arg));
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/* Open context with TEE driver */
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pvt_data.ctx = tee_client_open_context(NULL, optee_ctx_match, NULL,
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NULL);
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if (IS_ERR(pvt_data.ctx))
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return -ENODEV;
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/* Open session with Bnxt load Trusted App */
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memcpy(sess_arg.uuid, bnxt_device->id.uuid.b, TEE_IOCTL_UUID_LEN);
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sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
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sess_arg.num_params = 0;
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ret = tee_client_open_session(pvt_data.ctx, &sess_arg, NULL);
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if (ret < 0 || sess_arg.ret != 0) {
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dev_err(dev, "tee_client_open_session failed, err: %x\n",
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sess_arg.ret);
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err = -EINVAL;
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goto out_ctx;
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}
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pvt_data.session_id = sess_arg.session;
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pvt_data.dev = dev;
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fw_shm_pool = tee_shm_alloc_kernel_buf(pvt_data.ctx, MAX_SHM_MEM_SZ);
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if (IS_ERR(fw_shm_pool)) {
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dev_err(pvt_data.dev, "tee_shm_alloc_kernel_buf failed\n");
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err = PTR_ERR(fw_shm_pool);
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goto out_sess;
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}
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pvt_data.fw_shm_pool = fw_shm_pool;
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return 0;
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out_sess:
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tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
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out_ctx:
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tee_client_close_context(pvt_data.ctx);
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return err;
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}
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static int tee_bnxt_fw_remove(struct device *dev)
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{
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tee_shm_free(pvt_data.fw_shm_pool);
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tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
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tee_client_close_context(pvt_data.ctx);
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pvt_data.ctx = NULL;
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return 0;
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}
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static void tee_bnxt_fw_shutdown(struct device *dev)
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{
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tee_shm_free(pvt_data.fw_shm_pool);
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tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
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tee_client_close_context(pvt_data.ctx);
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pvt_data.ctx = NULL;
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}
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static const struct tee_client_device_id tee_bnxt_fw_id_table[] = {
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{UUID_INIT(0x6272636D, 0x2019, 0x0716,
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0x42, 0x43, 0x4D, 0x5F, 0x53, 0x43, 0x48, 0x49)},
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{}
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};
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MODULE_DEVICE_TABLE(tee, tee_bnxt_fw_id_table);
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static struct tee_client_driver tee_bnxt_fw_driver = {
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.id_table = tee_bnxt_fw_id_table,
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.driver = {
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.name = KBUILD_MODNAME,
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.bus = &tee_bus_type,
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.probe = tee_bnxt_fw_probe,
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.remove = tee_bnxt_fw_remove,
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.shutdown = tee_bnxt_fw_shutdown,
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},
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};
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static int __init tee_bnxt_fw_mod_init(void)
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{
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return driver_register(&tee_bnxt_fw_driver.driver);
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}
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static void __exit tee_bnxt_fw_mod_exit(void)
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{
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driver_unregister(&tee_bnxt_fw_driver.driver);
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}
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module_init(tee_bnxt_fw_mod_init);
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module_exit(tee_bnxt_fw_mod_exit);
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MODULE_AUTHOR("Vikas Gupta <vikas.gupta@broadcom.com>");
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MODULE_DESCRIPTION("Broadcom bnxt firmware manager");
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MODULE_LICENSE("GPL v2");
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