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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Sascha Hauer <sha@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 090/112] vsprintf: add %pD for printing EFI device path
Date: Mon, 4 Mar 2024 18:26:11 +0100	[thread overview]
Message-ID: <3f97da6e-be03-4b46-8652-8ff82a700d47@pengutronix.de> (raw)
In-Reply-To: <20240108090154.GC1318922@pengutronix.de>

Hello Sascha,

On 08.01.24 10:01, Sascha Hauer wrote:
> On Wed, Jan 03, 2024 at 07:12:50PM +0100, Ahmad Fatoum wrote:
>> We already have a few users that will want to print EFI device paths and
>> will gain quite a few more with incoming loader support, so let's allow
>> printing them directly with printf with the %pD format specifier.
>>
>> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
>> ---
>>  lib/vsprintf.c | 14 ++++++++++++++
>>  1 file changed, 14 insertions(+)
>>
>> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
>> index ea092c06d3d6..e41a1abee652 100644
>> --- a/lib/vsprintf.c
>> +++ b/lib/vsprintf.c
>> @@ -20,6 +20,7 @@
>>  #include <kallsyms.h>
>>  #include <wchar.h>
>>  #include <of.h>
>> +#include <efi.h>
>>  
>>  #include <common.h>
>>  #include <pbl.h>
>> @@ -348,6 +349,15 @@ char *uuid_string(char *buf, const char *end, const u8 *addr, int field_width,
>>  	return string(buf, end, uuid, field_width, precision, flags);
>>  }
>>  
>> +static char *device_path_string(char *buf, const char *end, const struct efi_device_path *dp,
>> +				int field_width, int precision, int flags)
>> +{
>> +	if (!dp)
>> +		return string(buf, end, NULL, field_width, precision, flags);
>> +
>> +	return buf + device_path_to_str_buf(dp, buf, end - buf);
>> +}
>> +
>>  static noinline_for_stack
>>  char *hex_string(char *buf, const char *end, const u8 *addr, int field_width,
>>  		 int precision, int flags, const char *fmt)
>> @@ -519,6 +529,10 @@ static char *pointer(const char *fmt, char *buf, const char *end, const void *pt
>>  	case 'J':
>>  		if (fmt[1] == 'P' && IS_ENABLED(CONFIG_JSMN))
>>  			return jsonpath_string(buf, end, ptr, field_width, precision, flags, fmt);
>> +	case 'D':
>> +		if (IS_ENABLED(CONFIG_EFI_DEVICEPATH))
>> +			return device_path_string(buf, end, ptr, field_width, precision, flags);
>> +		break;
> 
> Linux uses 'D' to print a filename from a struct file. This might become
> useful for barebox as well, so we might better choose a different letter
> here.

We can use 'd' along with f->f_path.dentry for that when we need to.
Another letter may conflict in future with something else that we want.
I would prefer to use 'D' as that's what U-Boot does and it avoids needless
churn for the UEFI code.

> Otherwise I think it's ok to introduce barebox specific pointer types in
> our printf implementation, even when they conflict with ones from the
> kernel, but we should update the comment above this function accordingly
> and clearly state when a letter is barebox specific.

I can do that.

Thanks,
Ahmad

> 
> Sascha
> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |




  reply	other threads:[~2024-03-04 17:26 UTC|newest]

Thread overview: 134+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-03 18:11 [PATCH 000/112] efi: prepare for ARM64 EFI loader support Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 001/112] string: implement strcmp_ptr and streq_ptr helpers Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 002/112] commands: efiexit: flush console and shutdown barebox Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 003/112] treewide: add errno_set helper for returning positive error code in errno Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 004/112] vsprintf: guard against NULL in UUID %pU Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 005/112] common: add option to poweroff system on failure Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 006/112] boot: print error code when booting fails Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 007/112] common: efi: move directory to top-level Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 008/112] efi: payload: rename CONFIG_EFI_BOOTUP to CONFIG_EFI_PAYLOAD Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 009/112] efi: payload: image: return actual read_file() error Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 010/112] of: don't report failure to of_read_file twice Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 011/112] efi: payload: make missing state reporting less verbose Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 012/112] libfile: factor out read_file_into_buf helper Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 013/112] efi: payload: image: allocate image via loader if it exceeds malloc area Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 014/112] efi: payload: image: use assigned barebox loader type on x86 Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 015/112] efi: payload: iomem: adjust types to avoid casting Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 016/112] commands: kallsyms: add command-line interface Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 017/112] block: define BLOCKSIZE globally in block.h Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 018/112] cdev: implement setter/getter for cdev device node Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 019/112] block: virtio: assign virtio-mmio device tree node to cdevs Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 020/112] commands: stat: print DT node for cdevs if available Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 021/112] partitions: have parsers record bootable bits Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 022/112] commands: stat: display bootable partition table bit info Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 023/112] block: record block device type Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 024/112] include: add definitions for UAPI discoverable partitions spec Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 025/112] efi: payload: restrict 8250 UART at I/O port 0x3f8 registration to x86 Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 026/112] fs: fix unreaddir, so readdir returns unread dirent first Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 027/112] fs: turn creat into static inline helper Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 028/112] fs: drop unused LOOKUP_ flags Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 029/112] fs: opendir: reference mount point until closedir is called Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 030/112] fs: factor out opendir iteration Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 031/112] fs: implement fdopendir and rewinddir Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 032/112] fs: remove unused member from struct nameidata Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 033/112] fs: always check path_init for errors Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 034/112] fs: set current working dir directly when mounting root Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 035/112] fs: implement openat and friends Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 036/112] fs: implement O_PATH Ahmad Fatoum
2024-01-05 11:22   ` Sascha Hauer
2024-01-05 11:26     ` Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 037/112] fs: support different root directories Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 038/112] fs: implement O_CHROOT Ahmad Fatoum
2024-01-03 18:11 ` [PATCH 039/112] commands: introduce new findmnt command Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 040/112] fs: initialize struct nameidata::last Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 041/112] fs: support opening / Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 042/112] test: self: add dirfd tests Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 043/112] commands: stat: add option for statat Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 044/112] efi: payload: lower command line options print from error to info Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 045/112] efi: payload: init: warn if /boot FS is unknown Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 046/112] commands: time: refactor into new strjoin Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 047/112] string: reduce strjoin runtime, drop trailing separator Ahmad Fatoum
2024-01-08  7:11   ` Sascha Hauer
2024-01-08  7:18     ` Ahmad Fatoum
2024-01-08  7:43       ` Sascha Hauer
2024-01-03 18:12 ` [PATCH 048/112] test: self: add strjoin tests Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 049/112] filetype: have cdev_detect_type take a cdev Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 050/112] ARM: mmu-early: gracefully handle already enabled MMU Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 051/112] efi: don't hide structs, enums or unions behind _t Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 052/112] efi: make headers self-contained Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 053/112] efi: unify whitespace for GUIDs Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 054/112] efi: efi-guid: add more GUIDs Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 055/112] ARM64: cpu: setupc: rewrite to be fully PIC Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 056/112] ARM64: runtime-offset: make get_runtime_offset " Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 057/112] pbl: introduce CONFIG_PBL_FULLY_PIC Ahmad Fatoum
2024-01-08  7:47   ` Sascha Hauer
2024-01-22 19:15     ` Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 058/112] efi: payload: fix ARM build Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 059/112] efi: payload: init: restrict barebox mem to first 1G only on x86 Ahmad Fatoum
2024-01-03 18:58   ` Michael Olbrich
2024-01-04 11:17     ` Ahmad Fatoum
2024-01-04 18:10       ` Michael Olbrich
2024-01-05  9:14         ` Ahmad Fatoum
2024-01-05  9:31           ` Michael Olbrich
2024-01-05 10:41             ` Ahmad Fatoum
2024-01-05 14:58               ` Michael Olbrich
2024-01-08  7:22                 ` Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 060/112] ARM: pbl: add 64K segment alignment for PE/COFF Ahmad Fatoum
2024-01-08  8:05   ` Sascha Hauer
2024-01-22 19:18     ` Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 061/112] efi: add efi_is_loader/efi_is_payload helpers Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 062/112] efi: payload: suppress EFI payload initcalls when not EFI-loaded Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 063/112] ARM: make board data definitions accessible to other architectures Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 064/112] boarddata: add barebox_boarddata_is_machine helper Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 065/112] common: add PE/COFF loader Ahmad Fatoum
2024-01-08  8:37   ` Sascha Hauer
2024-03-04 17:09     ` Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 066/112] efi: use efi_handle_t where appropriate Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 067/112] efi: block: move definitions into header file Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 068/112] efi: define efi_handle_t as opaque pointer Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 069/112] efi: constify guid_t in API Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 070/112] efi: rename efi_simple_input_interface to efi_simple_text_input_protocol Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 071/112] efi: add EFI_WARN constants Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 072/112] efi-stdio: fix wait_for_event argument Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 073/112] efi-stdio: wait for extended input key event when using extended input Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 074/112] efi: flesh out EFI definitions in header Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 075/112] efi: add efi_driver_binding_protocol Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 076/112] efi: improve usability of EFI_PAGE_* macros Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 077/112] fs: efi: move definitions into header Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 078/112] efi: fs: flesh out file system definitions Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 079/112] efi: stdio: fix efi_register_keystroke_notify prototype Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 080/112] video: mark EFI_GOP driver x86-only for now Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 081/112] filetype: add new file types for EFI-enabled Linux images Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 082/112] efi: payload: register handler for EFI-stubbed ARM64 kernel Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 083/112] efi: payload: factor C efi_main into dedicated file Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 084/112] efi: payload: early-mem: simplify error message reporting Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 085/112] efi: payload: early-mem: use EFI_PAGE_SIZE instead of PAGE_SIZE Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 086/112] ARM64: add optional EFI stub Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 087/112] efi: devicepath: improve const safety Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 088/112] efi: refactor device_path_to_partuuid for code reuse Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 089/112] efi: devicepath: implement device_path_to_str_buf variant Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 090/112] vsprintf: add %pD for printing EFI device path Ahmad Fatoum
2024-01-08  9:01   ` Sascha Hauer
2024-03-04 17:26     ` Ahmad Fatoum [this message]
2024-01-03 18:12 ` [PATCH 091/112] lib: string: import Linux strreplace helper Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 092/112] efi: payload: dynamically determine bootloader file name Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 093/112] efi: payload: iomem: register later Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 094/112] efi: payload: protect against buggy EFI implementations Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 095/112] efi: payload: don't require efi_loaded_image->parent_handle for bootsource detection Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 096/112] commands: add cpuinfo -s option for stacktrace Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 097/112] efi: devicepath: align MemoryMapped name with spec Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 098/112] efi: devicepath: pretty print BBS BEV DeviceType Ahmad Fatoum
2024-01-03 18:12 ` [PATCH 099/112] efi: devicepath: format GUIDs as little endian Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 100/112] efi: devicepath: move END device node definitions into header Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 101/112] efi: devicepath: drop underscores in hex constants Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 102/112] efi: devicepath: namespace definitions Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 103/112] efi: devicepath: use flexible array members for trailing strings Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 104/112] efi: devicepath: drop unused macro Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 105/112] efi: devicepath: let compiler worry about unaligned unpacking Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 106/112] efi: devicepath: correct formatting of BBS Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 107/112] commands: provide efi_handle_dump in both payload and loader Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 108/112] lib: uuid: implement uuid/guid_parse Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 109/112] commands: efi_handle_dump: prepare for supporting EFI loader Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 110/112] commands: efi_handle_dump: print loaded image devpath Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 111/112] commands: efi_handle_dump: use guid_parse instead of open-coding Ahmad Fatoum
2024-01-03 18:13 ` [PATCH 112/112] commands: efi_handle_dump: don't ignore failure to parse GUID Ahmad Fatoum

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