kernel/linux.git/arch/s390/include/asm/debug.h, branch v6.19.11

s390/pci: Add pci_msg debug view to PCI report

2024-12-16T15:14:27+00:00

Using the newly introduced debug_dump() mechanism add formatted content of pci_debug_msg_id to the PCI report. The formatting is based on the existing sprintf format but removes caller pointer and area index and adds an column header. This will allow the platform to collect this log data together with hardware errors. This sets the reverse flag such that the newest log entries get added to the PCI report even if not all debug log entries fit. Reviewed-by: Halil Pasic Co-developed-by: Halil Pasic Signed-off-by: Halil Pasic Signed-off-by: Niklas Schnelle Signed-off-by: Alexander Gordeev

s390/debug: Add a reverse mode for debug_dump()

2024-12-16T15:14:26+00:00

In this mode debug_dump() writes the debug log starting at the newest entry followed by earlier entries. To this end add a debug_prev_entry() helper analogous to debug_next_entry() a helper to get the latest entry which is one before the active entry and a helper to iterate either forward or backward. Reviewed-by: Halil Pasic Co-developed-by: Halil Pasic Signed-off-by: Halil Pasic Signed-off-by: Niklas Schnelle Signed-off-by: Alexander Gordeev

s390/debug: Add debug_dump() to write debug view to a string buffer

2024-12-16T15:14:26+00:00

The debug_dump() function allows to get the content of a debug log and view pair in a string buffer. One future application of this is to provide debug logs to the platform to be collected with hardware error logs during recovery. Reviewed-by: Halil Pasic Co-developed-by: Halil Pasic Signed-off-by: Halil Pasic Signed-off-by: Niklas Schnelle Signed-off-by: Alexander Gordeev

s390/debug: Pass in and enforce output buffer size for format handlers

2024-11-21T11:44:06+00:00

The s390dbf format handler rely on being passed an output buffer sized such that their output will always fit and then use plain sprintf() to write to it. While only supplied data from other kernel components this still potentially allows buffer overwrite if callers are not careful. Instead just pass in the size of the output buffer and use scnprintf() instead of sprintf() and strscpy() instead of strcpy(). The latter also allows us to get rid of a separate strlen() call. Signed-off-by: Niklas Schnelle Reviewed-by: Heiko Carstens Signed-off-by: Heiko Carstens

docs: move s390 under arch

2023-07-24T10:12:24+00:00

and fix all in-tree references. Architecture-specific documentation is being moved into Documentation/arch/ as a way of cleaning up the top-level documentation directory and making the docs hierarchy more closely match the source hierarchy. Signed-off-by: Costa Shulyupin Reviewed-by: Tony Krowiak Acked-by: Jonathan Corbet Acked-by: Heiko Carstens Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Randy Dunlap Link: https://lore.kernel.org/r/20230718045550.495428-1-costa.shul@redhat.com Signed-off-by: Heiko Carstens

s390/debug: add _ASM_S390_ prefix to header guard

2023-01-06T15:38:21+00:00

Using DEBUG_H without a prefix is very generic and inconsistent with other header guards in arch/s390/include/asm. In fact it collides with the same name in the ath9k wireless driver though that depends on !S390 via disabled wireless support. Let's just use a consistent header guard name and prevent possible future trouble. Signed-off-by: Niklas Schnelle Signed-off-by: Heiko Carstens

s390/debug: fix kernel-doc warnings

2021-10-11T18:55:58+00:00

Fix kernel-doc warning due to incorrect parameter name in kernel-doc function notation: ../arch/s390/include/asm/debug.h:484: warning: Function parameter or member 'pages' not described in 'DEFINE_STATIC_DEBUG_INFO' ../arch/s390/include/asm/debug.h:484: warning: Excess function parameter 'pages_per_area' description in 'DEFINE_STATIC_DEBUG_INFO' Fixes: d72541f94512 ("s390/debug: add early tracing support") Signed-off-by: Randy Dunlap Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: linux-s390@vger.kernel.org Cc: Peter Oberparleiter Link: https://lore.kernel.org/r/20211005051657.16714-1-rdunlap@infradead.org Signed-off-by: Christian Borntraeger Signed-off-by: Vasily Gorbik

s390/debug: add early tracing support

2021-08-25T09:03:35+00:00

Debug areas can currently only be used after s390dbf initialization which occurs as a postcore_initcall. This is too late for tracing earlier code such as that related to console_init(). This patch introduces a macro for defining a statically initialized debug area that can be used to trace very early code. The macro is made available for built-in code only because modules are never running during early boot. Example usage: 1. Define static debug area: DEFINE_STATIC_DEBUG_INFO(my_debug, "my_debug", 4, 1, 16, &debug_hex_ascii_view); 2. Add trace entry: debug_event(&my_debug, 0, "DATA", 4); Note: The debug area is automatically registered in debugfs during boot. A driver must not call any of the debug_register()/_unregister() functions on a static debug_info_t! Signed-off-by: Peter Oberparleiter Signed-off-by: Heiko Carstens

s390/debug: remove unused print defines

2021-07-27T07:39:14+00:00

Remove unused print defines from debug feature header file. Signed-off-by: Heiko Carstens

s390/debug: debug feature version 3

2020-08-11T16:16:43+00:00

Change __debug_entry structure in the following way: - remove redundant union - Field containing cpuid is expanded to 16 bits. 8-bit width was not enough since we already support up to 512 cpus. - Field containing the timestamp is expanded to 60 bits. The timestamp itself is now stored in the absolute Unix time format in microseconds taking the Epoch Index into acount. Adjust default header for debug entries by setting minimum width for cpuid to 4 digits. Reviewed-by: Heiko Carstens Signed-off-by: Mikhail Zaslonko Signed-off-by: Heiko Carstens