cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/wireless/ath/ath10k/swap.c

/*
 * Copyright (c) 2015 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* This file has implementation for code swap logic. With code swap feature,
 * target can run the fw binary with even smaller IRAM size by using host
 * memory to store some of the code segments.
 */

#include "core.h"
#include "bmi.h"
#include "debug.h"


static int ath10k_swap_code_seg_fill(struct ath10k *ar, struct ath10k_swap_code_seg_info *seg_info, const void *data, size_t data_len) { u8 *virt_addr = seg_info->virt_address[0]; u8 swap_magic[ATH10K_SWAP_CODE_SEG_MAGIC_BYTES_SZ] = {}; const u8 *fw_data = data; union ath10k_swap_code_seg_item *swap_item; u32 length = 0; u32 payload_len; u32 total_payload_len = 0; u32 size_left = data_len; /* Parse swap bin and copy the content to host allocated memory. * The format is Address, length and value. The last 4-bytes is * target write address. Currently address field is not used. */ seg_info->target_addr = -1; while (size_left >= sizeof(*swap_item)) { swap_item = (union ath10k_swap_code_seg_item *)fw_data; payload_len = __le32_to_cpu(swap_item->tlv.length); if ((payload_len > size_left) || (payload_len == 0 && size_left != sizeof(struct ath10k_swap_code_seg_tail))) { ath10k_err(ar, "refusing to parse invalid tlv length %d\n", payload_len); return -EINVAL; } if (payload_len == 0) { if (memcmp(swap_item->tail.magic_signature, swap_magic, ATH10K_SWAP_CODE_SEG_MAGIC_BYTES_SZ)) { ath10k_err(ar, "refusing an invalid swap file\n"); return -EINVAL; } seg_info->target_addr = __le32_to_cpu(swap_item->tail.bmi_write_addr); break; } memcpy(virt_addr, swap_item->tlv.data, payload_len); virt_addr += payload_len; length = payload_len + sizeof(struct ath10k_swap_code_seg_tlv); size_left -= length; fw_data += length; total_payload_len += payload_len; } if (seg_info->target_addr == -1) { ath10k_err(ar, "failed to parse invalid swap file\n"); return -EINVAL; } seg_info->seg_hw_info.swap_size = __cpu_to_le32(total_payload_len); return 0; }

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Vasanthakumar Thiagarajan275100.00%1100.00%
Total275100.00%1100.00%


static void ath10k_swap_code_seg_free(struct ath10k *ar, struct ath10k_swap_code_seg_info *seg_info) { u32 seg_size; if (!seg_info) return; if (!seg_info->virt_address[0]) return; seg_size = __le32_to_cpu(seg_info->seg_hw_info.size); dma_free_coherent(ar->dev, seg_size, seg_info->virt_address[0], seg_info->paddr[0]); }

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Vasanthakumar Thiagarajan70100.00%1100.00%
Total70100.00%1100.00%


static struct ath10k_swap_code_seg_info * ath10k_swap_code_seg_alloc(struct ath10k *ar, size_t swap_bin_len) { struct ath10k_swap_code_seg_info *seg_info; void *virt_addr; dma_addr_t paddr; swap_bin_len = roundup(swap_bin_len, 2); if (swap_bin_len > ATH10K_SWAP_CODE_SEG_BIN_LEN_MAX) { ath10k_err(ar, "refusing code swap bin because it is too big %zu > %d\n", swap_bin_len, ATH10K_SWAP_CODE_SEG_BIN_LEN_MAX); return NULL; } seg_info = devm_kzalloc(ar->dev, sizeof(*seg_info), GFP_KERNEL); if (!seg_info) return NULL; virt_addr = dma_alloc_coherent(ar->dev, swap_bin_len, &paddr, GFP_KERNEL); if (!virt_addr) { ath10k_err(ar, "failed to allocate dma coherent memory\n"); return NULL; } seg_info->seg_hw_info.bus_addr[0] = __cpu_to_le32(paddr); seg_info->seg_hw_info.size = __cpu_to_le32(swap_bin_len); seg_info->seg_hw_info.swap_size = __cpu_to_le32(swap_bin_len); seg_info->seg_hw_info.num_segs = __cpu_to_le32(ATH10K_SWAP_CODE_SEG_NUM_SUPPORTED); seg_info->seg_hw_info.size_log2 = __cpu_to_le32(ilog2(swap_bin_len)); seg_info->virt_address[0] = virt_addr; seg_info->paddr[0] = paddr; return seg_info; }

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Vasanthakumar Thiagarajan199100.00%1100.00%
Total199100.00%1100.00%


int ath10k_swap_code_seg_configure(struct ath10k *ar, const struct ath10k_fw_file *fw_file) { int ret; struct ath10k_swap_code_seg_info *seg_info = NULL; if (!fw_file->firmware_swap_code_seg_info) return 0; ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot found firmware code swap binary\n"); seg_info = fw_file->firmware_swap_code_seg_info; ret = ath10k_bmi_write_memory(ar, seg_info->target_addr, &seg_info->seg_hw_info, sizeof(seg_info->seg_hw_info)); if (ret) { ath10k_err(ar, "failed to write Code swap segment information (%d)\n", ret); return ret; } return 0; }

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Vasanthakumar Thiagarajan8791.58%150.00%
Tamizh chelvam88.42%150.00%
Total95100.00%2100.00%


void ath10k_swap_code_seg_release(struct ath10k *ar, struct ath10k_fw_file *fw_file) { ath10k_swap_code_seg_free(ar, fw_file->firmware_swap_code_seg_info); /* FIXME: these two assignments look to bein wrong place! Shouldn't * they be in ath10k_core_free_firmware_files() like the rest? */ fw_file->codeswap_data = NULL; fw_file->codeswap_len = 0; fw_file->firmware_swap_code_seg_info = NULL; }

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Vasanthakumar Thiagarajan2967.44%133.33%
Tamizh chelvam920.93%133.33%
Kalle Valo511.63%133.33%
Total43100.00%3100.00%


int ath10k_swap_code_seg_init(struct ath10k *ar, struct ath10k_fw_file *fw_file) { int ret; struct ath10k_swap_code_seg_info *seg_info; const void *codeswap_data; size_t codeswap_len; codeswap_data = fw_file->codeswap_data; codeswap_len = fw_file->codeswap_len; if (!codeswap_len || !codeswap_data) return 0; seg_info = ath10k_swap_code_seg_alloc(ar, codeswap_len); if (!seg_info) { ath10k_err(ar, "failed to allocate fw code swap segment\n"); return -ENOMEM; } ret = ath10k_swap_code_seg_fill(ar, seg_info, codeswap_data, codeswap_len); if (ret) { ath10k_warn(ar, "failed to initialize fw code swap segment: %d\n", ret); ath10k_swap_code_seg_free(ar, seg_info); return ret; } fw_file->firmware_swap_code_seg_info = seg_info; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Vasanthakumar Thiagarajan9271.88%133.33%
Kalle Valo2821.88%133.33%
Tamizh chelvam86.25%133.33%
Total128100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Vasanthakumar Thiagarajan76392.94%133.33%
Kalle Valo334.02%133.33%
Tamizh chelvam253.05%133.33%
Total821100.00%3100.00%
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