Re: [PATCH v7 7/8] platform/x86: touchscreen_dmi: Add EFI embedded firmware info support

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Hi Hans,

I love your patch! Yet something to improve:

[auto build test ERROR on efi/next]
[cannot apply to v5.4-rc1 next-20191004]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Hans-de-Goede/efi-firmware-platform-x86-Add-EFI-embedded-fw-support/20191005-021239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
config: x86_64-randconfig-a004-201939 (attached as .config)
compiler: gcc-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   drivers/firmware/efi/embedded-firmware.c: In function 'efi_check_md_for_embedded_firmware':
>> drivers/firmware/efi/embedded-firmware.c:64:3: error: implicit declaration of function 'sha256_init' [-Werror=implicit-function-declaration]
      sha256_init(&sctx);
      ^
>> drivers/firmware/efi/embedded-firmware.c:65:3: error: implicit declaration of function 'sha256_update' [-Werror=implicit-function-declaration]
      sha256_update(&sctx, map + i, desc->length);
      ^
   drivers/firmware/efi/embedded-firmware.c:66:3: error: implicit declaration of function 'sha256_final' [-Werror=implicit-function-declaration]
      sha256_final(&sctx, sha256);
      ^
   cc1: some warnings being treated as errors

vim +/sha256_init +64 drivers/firmware/efi/embedded-firmware.c

3977d46d946ae2 Hans de Goede 2019-10-04  32  
3977d46d946ae2 Hans de Goede 2019-10-04  33  /*
3977d46d946ae2 Hans de Goede 2019-10-04  34   * Note the efi_check_for_embedded_firmwares() code currently makes the
3977d46d946ae2 Hans de Goede 2019-10-04  35   * following 2 assumptions. This may needs to be revisited if embedded firmware
3977d46d946ae2 Hans de Goede 2019-10-04  36   * is found where this is not true:
3977d46d946ae2 Hans de Goede 2019-10-04  37   * 1) The firmware is only found in EFI_BOOT_SERVICES_CODE memory segments
3977d46d946ae2 Hans de Goede 2019-10-04  38   * 2) The firmware always starts at an offset which is a multiple of 8 bytes
3977d46d946ae2 Hans de Goede 2019-10-04  39   */
3977d46d946ae2 Hans de Goede 2019-10-04  40  static int __init efi_check_md_for_embedded_firmware(
3977d46d946ae2 Hans de Goede 2019-10-04  41  	efi_memory_desc_t *md, const struct efi_embedded_fw_desc *desc)
3977d46d946ae2 Hans de Goede 2019-10-04  42  {
3977d46d946ae2 Hans de Goede 2019-10-04  43  	const u64 prefix = *((u64 *)desc->prefix);
3977d46d946ae2 Hans de Goede 2019-10-04  44  	struct sha256_state sctx;
3977d46d946ae2 Hans de Goede 2019-10-04  45  	struct embedded_fw *fw;
3977d46d946ae2 Hans de Goede 2019-10-04  46  	u8 sha256[32];
3977d46d946ae2 Hans de Goede 2019-10-04  47  	u64 i, size;
3977d46d946ae2 Hans de Goede 2019-10-04  48  	void *map;
3977d46d946ae2 Hans de Goede 2019-10-04  49  
3977d46d946ae2 Hans de Goede 2019-10-04  50  	size = md->num_pages << EFI_PAGE_SHIFT;
3977d46d946ae2 Hans de Goede 2019-10-04  51  	map = memremap(md->phys_addr, size, MEMREMAP_WB);
3977d46d946ae2 Hans de Goede 2019-10-04  52  	if (!map) {
3977d46d946ae2 Hans de Goede 2019-10-04  53  		pr_err("Error mapping EFI mem at %#llx\n", md->phys_addr);
3977d46d946ae2 Hans de Goede 2019-10-04  54  		return -ENOMEM;
3977d46d946ae2 Hans de Goede 2019-10-04  55  	}
3977d46d946ae2 Hans de Goede 2019-10-04  56  
3977d46d946ae2 Hans de Goede 2019-10-04  57  	size -= desc->length;
3977d46d946ae2 Hans de Goede 2019-10-04  58  	for (i = 0; i < size; i += 8) {
3977d46d946ae2 Hans de Goede 2019-10-04  59  		u64 *mem = map + i;
3977d46d946ae2 Hans de Goede 2019-10-04  60  
3977d46d946ae2 Hans de Goede 2019-10-04  61  		if (*mem != prefix)
3977d46d946ae2 Hans de Goede 2019-10-04  62  			continue;
3977d46d946ae2 Hans de Goede 2019-10-04  63  
3977d46d946ae2 Hans de Goede 2019-10-04 @64  		sha256_init(&sctx);
3977d46d946ae2 Hans de Goede 2019-10-04 @65  		sha256_update(&sctx, map + i, desc->length);
3977d46d946ae2 Hans de Goede 2019-10-04  66  		sha256_final(&sctx, sha256);
3977d46d946ae2 Hans de Goede 2019-10-04  67  		if (memcmp(sha256, desc->sha256, 32) == 0)
3977d46d946ae2 Hans de Goede 2019-10-04  68  			break;
3977d46d946ae2 Hans de Goede 2019-10-04  69  	}
3977d46d946ae2 Hans de Goede 2019-10-04  70  	if (i >= size) {
3977d46d946ae2 Hans de Goede 2019-10-04  71  		memunmap(map);
3977d46d946ae2 Hans de Goede 2019-10-04  72  		return -ENOENT;
3977d46d946ae2 Hans de Goede 2019-10-04  73  	}
3977d46d946ae2 Hans de Goede 2019-10-04  74  
3977d46d946ae2 Hans de Goede 2019-10-04  75  	pr_info("Found EFI embedded fw '%s'\n", desc->name);
3977d46d946ae2 Hans de Goede 2019-10-04  76  
3977d46d946ae2 Hans de Goede 2019-10-04  77  	fw = kmalloc(sizeof(*fw), GFP_KERNEL);
3977d46d946ae2 Hans de Goede 2019-10-04  78  	if (!fw) {
3977d46d946ae2 Hans de Goede 2019-10-04  79  		memunmap(map);
3977d46d946ae2 Hans de Goede 2019-10-04  80  		return -ENOMEM;
3977d46d946ae2 Hans de Goede 2019-10-04  81  	}
3977d46d946ae2 Hans de Goede 2019-10-04  82  
3977d46d946ae2 Hans de Goede 2019-10-04  83  	fw->data = kmemdup(map + i, desc->length, GFP_KERNEL);
3977d46d946ae2 Hans de Goede 2019-10-04  84  	memunmap(map);
3977d46d946ae2 Hans de Goede 2019-10-04  85  	if (!fw->data) {
3977d46d946ae2 Hans de Goede 2019-10-04  86  		kfree(fw);
3977d46d946ae2 Hans de Goede 2019-10-04  87  		return -ENOMEM;
3977d46d946ae2 Hans de Goede 2019-10-04  88  	}
3977d46d946ae2 Hans de Goede 2019-10-04  89  
3977d46d946ae2 Hans de Goede 2019-10-04  90  	fw->name = desc->name;
3977d46d946ae2 Hans de Goede 2019-10-04  91  	fw->length = desc->length;
3977d46d946ae2 Hans de Goede 2019-10-04  92  	list_add(&fw->list, &found_fw_list);
3977d46d946ae2 Hans de Goede 2019-10-04  93  
3977d46d946ae2 Hans de Goede 2019-10-04  94  	return 0;
3977d46d946ae2 Hans de Goede 2019-10-04  95  }
3977d46d946ae2 Hans de Goede 2019-10-04  96  

:::::: The code at line 64 was first introduced by commit
:::::: 3977d46d946ae2699ac2c8196d52fb9b303909c9 efi: Add embedded peripheral firmware support

:::::: TO: Hans de Goede <hdegoede@xxxxxxxxxx>
:::::: CC: 0day robot <lkp@xxxxxxxxx>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

Attachment: .config.gz
Description: application/gzip


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