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286 lines
6.8 KiB
286 lines
6.8 KiB
// 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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export_uuid(sess_arg.uuid, &bnxt_device->id.uuid); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Broadcom bnxt firmware manager"); |
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MODULE_LICENSE("GPL v2");
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