linux-kernel - [PATCH 0/3] arm64/ptdump: Add cmdline 'early

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Message-Id: <20250910094623.2356282-1-anshuman.khandual@arm.com>
Date: Wed, 10 Sep 2025 15:16:20 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Ritesh Harjani <ritesh.list@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org
Subject: [PATCH 0/3] arm64/ptdump: Add cmdline 'early_ptdump'

Enable early kernel page table dump for debug purpose when required through
a new kernel command line option 'early_ptdump'. But first this reorganizes
ptdump_init() separating out the debugfs creation, so that it can be called
early on in setup_arch(). This also adds kernel dmesg console print support
for existing pt_dump_seq_[printf|puts]() helpers.

This series applies on v6.17-rc5

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Mark Brown <broonie@...nel.org>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Ritesh Harjani (IBM) <ritesh.list@...il.com>
Cc: linux-kernel@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-efi@...r.kernel.org

Changes in V1:

- Dropped ARM64_PTDUMP_CONSOLE and instead enabled cmdline 'early_ptdump'

Changes in RFC:

https://lore.kernel.org/all/20250818091436.938517-1-anshuman.khandual@arm.com/

Anshuman Khandual (3):
  arm64/ptdump: Re-organize ptdump_init()
  arm64/ptdump: Enable console output in pt_dump_seq_[printf|puts]()
  arm64/ptdump: Add 'early_ptdump' kernel command line option

 .../admin-guide/kernel-parameters.txt         |  4 ++
 arch/arm64/include/asm/ptdump.h               |  4 ++
 arch/arm64/kernel/setup.c                     |  3 ++
 arch/arm64/mm/ptdump.c                        | 51 +++++++++++++++----
 drivers/firmware/efi/arm-runtime.c            |  4 +-
 5 files changed, 53 insertions(+), 13 deletions(-)

-- 
2.25.1