linux-kernel - [PATCH v3 00/19] irqdomain: fix mapping race and clean up locking

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Message-Id: <20221209140150.1453-1-johan+linaro@kernel.org>
Date:   Fri,  9 Dec 2022 15:01:31 +0100
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        platform-driver-x86@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH v3 00/19] irqdomain: fix mapping race and clean up locking

Parallel probing (e.g. due to asynchronous probing) of devices that
share interrupts can currently result in two mappings for the same
hardware interrupt to be created.

This series fixes this mapping race and clean up the irqdomain locking
so that in the end the global irq_domain_mutex is only used for managing
the likewise global irq_domain_list, while domain operations (e.g.
IRQ allocations) use per-domain (hierarchy) locking.

Johan


Changes in v2
 - split out redundant-lookup cleanup (1/4)
 - use a per-domain mutex to address mapping race (2/4)
 - move kernel-doc to exported function (2/4)
 - fix association race (3/4, new)
 - use per-domain mutex for associations (4/4, new)

Changes in v3
 - drop dead and bogus code (1--3/19, new)
 - fix racy mapcount accesses (5/19, new)
 - drop revmap mutex (6/19, new)
 - use irq_domain_mutex to address mapping race (9/19)
 - clean up irq_domain_push/pop_irq() (10/19, new)
 - use irq_domain_create_hierarchy() to construct hierarchies
   (11--18/19, new)
 - switch to per-domain locking (19/19, new)


Johan Hovold (19):
  irqdomain: Drop bogus fwspec-mapping error handling
  irqdomain: Drop dead domain-name assignment
  irqdomain: Drop leftover brackets
  irqdomain: Fix association race
  irqdomain: Fix disassociation race
  irqdomain: Drop revmap mutex
  irqdomain: Look for existing mapping only once
  irqdomain: Refactor __irq_domain_alloc_irqs()
  irqdomain: Fix mapping-creation race
  irqdomain: Clean up irq_domain_push/pop_irq()
  x86/ioapic: Use irq_domain_create_hierarchy()
  x86/apic: Use irq_domain_create_hierarchy()
  irqchip/alpine-msi: Use irq_domain_add_hierarchy()
  irqchip/gic-v2m: Use irq_domain_create_hierarchy()
  irqchip/gic-v3-its: Use irq_domain_create_hierarchy()
  irqchip/gic-v3-mbi: Use irq_domain_create_hierarchy()
  irqchip/loongson-pch-msi: Use irq_domain_create_hierarchy()
  irqchip/mvebu-odmi: Use irq_domain_create_hierarchy()
  irqdomain: Switch to per-domain locking

 arch/x86/kernel/apic/io_apic.c         |   8 +-
 arch/x86/platform/uv/uv_irq.c          |   7 +-
 drivers/irqchip/irq-alpine-msi.c       |   8 +-
 drivers/irqchip/irq-gic-v2m.c          |   5 +-
 drivers/irqchip/irq-gic-v3-its.c       |  13 +-
 drivers/irqchip/irq-gic-v3-mbi.c       |   5 +-
 drivers/irqchip/irq-loongson-pch-msi.c |   9 +-
 drivers/irqchip/irq-mvebu-odmi.c       |  13 +-
 include/linux/irqdomain.h              |   6 +-
 kernel/irq/irqdomain.c                 | 328 ++++++++++++++-----------
 10 files changed, 220 insertions(+), 182 deletions(-)

-- 
2.37.4