forked from Minki/linux
4b794f8066
This allows userspace to have a shorter period of time that the device is unusable and to call it at a more convenient time. For example flushing the image may happen while the user is using the machine and authenticating/rebooting may happen while logging out. Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
171 lines
3.9 KiB
C
171 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* NVM helpers
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*
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* Copyright (C) 2020, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "tb.h"
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static DEFINE_IDA(nvm_ida);
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/**
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* tb_nvm_alloc() - Allocate new NVM structure
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* @dev: Device owning the NVM
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*
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* Allocates new NVM structure with unique @id and returns it. In case
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* of error returns ERR_PTR().
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*/
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struct tb_nvm *tb_nvm_alloc(struct device *dev)
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{
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struct tb_nvm *nvm;
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int ret;
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nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
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if (!nvm)
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return ERR_PTR(-ENOMEM);
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ret = ida_simple_get(&nvm_ida, 0, 0, GFP_KERNEL);
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if (ret < 0) {
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kfree(nvm);
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return ERR_PTR(ret);
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}
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nvm->id = ret;
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nvm->dev = dev;
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return nvm;
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}
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/**
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* tb_nvm_add_active() - Adds active NVMem device to NVM
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* @nvm: NVM structure
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* @size: Size of the active NVM in bytes
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* @reg_read: Pointer to the function to read the NVM (passed directly to the
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* NVMem device)
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*
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* Registers new active NVmem device for @nvm. The @reg_read is called
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* directly from NVMem so it must handle possible concurrent access if
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* needed. The first parameter passed to @reg_read is @nvm structure.
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* Returns %0 in success and negative errno otherwise.
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*/
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int tb_nvm_add_active(struct tb_nvm *nvm, size_t size, nvmem_reg_read_t reg_read)
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{
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struct nvmem_config config;
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struct nvmem_device *nvmem;
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memset(&config, 0, sizeof(config));
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config.name = "nvm_active";
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config.reg_read = reg_read;
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config.read_only = true;
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config.id = nvm->id;
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config.stride = 4;
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config.word_size = 4;
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config.size = size;
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config.dev = nvm->dev;
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config.owner = THIS_MODULE;
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config.priv = nvm;
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nvmem = nvmem_register(&config);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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nvm->active = nvmem;
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return 0;
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}
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/**
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* tb_nvm_write_buf() - Write data to @nvm buffer
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* @nvm: NVM structure
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* @offset: Offset where to write the data
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* @val: Data buffer to write
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* @bytes: Number of bytes to write
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*
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* Helper function to cache the new NVM image before it is actually
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* written to the flash. Copies @bytes from @val to @nvm->buf starting
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* from @offset.
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*/
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int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
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size_t bytes)
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{
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if (!nvm->buf) {
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nvm->buf = vmalloc(NVM_MAX_SIZE);
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if (!nvm->buf)
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return -ENOMEM;
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}
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nvm->flushed = false;
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nvm->buf_data_size = offset + bytes;
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memcpy(nvm->buf + offset, val, bytes);
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return 0;
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}
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/**
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* tb_nvm_add_non_active() - Adds non-active NVMem device to NVM
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* @nvm: NVM structure
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* @size: Size of the non-active NVM in bytes
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* @reg_write: Pointer to the function to write the NVM (passed directly
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* to the NVMem device)
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*
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* Registers new non-active NVmem device for @nvm. The @reg_write is called
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* directly from NVMem so it must handle possible concurrent access if
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* needed. The first parameter passed to @reg_write is @nvm structure.
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* Returns %0 in success and negative errno otherwise.
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*/
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int tb_nvm_add_non_active(struct tb_nvm *nvm, size_t size,
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nvmem_reg_write_t reg_write)
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{
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struct nvmem_config config;
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struct nvmem_device *nvmem;
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memset(&config, 0, sizeof(config));
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config.name = "nvm_non_active";
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config.reg_write = reg_write;
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config.root_only = true;
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config.id = nvm->id;
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config.stride = 4;
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config.word_size = 4;
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config.size = size;
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config.dev = nvm->dev;
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config.owner = THIS_MODULE;
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config.priv = nvm;
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nvmem = nvmem_register(&config);
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if (IS_ERR(nvmem))
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return PTR_ERR(nvmem);
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nvm->non_active = nvmem;
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return 0;
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}
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/**
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* tb_nvm_free() - Release NVM and its resources
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* @nvm: NVM structure to release
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*
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* Releases NVM and the NVMem devices if they were registered.
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*/
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void tb_nvm_free(struct tb_nvm *nvm)
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{
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if (nvm) {
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if (nvm->non_active)
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nvmem_unregister(nvm->non_active);
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if (nvm->active)
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nvmem_unregister(nvm->active);
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vfree(nvm->buf);
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ida_simple_remove(&nvm_ida, nvm->id);
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}
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kfree(nvm);
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}
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void tb_nvm_exit(void)
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{
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ida_destroy(&nvm_ida);
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}
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