Messages in this thread Patch in this message | | | Date | Mon, 26 Aug 2019 11:46:08 -0000 | From | tip-bot2 for Thomas Gleixner <> | Subject | [tip: x86/urgent] x86/apic: Fix arch_dynirq_lower_bound() bug for DT enabled machines |
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The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: 3e5bedc2c258341702ddffbd7688c5e6eb01eafa Gitweb: https://git.kernel.org/tip/3e5bedc2c258341702ddffbd7688c5e6eb01eafa Author: Thomas Gleixner <tglx@linutronix.de> AuthorDate: Wed, 21 Aug 2019 15:16:31 +02:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Mon, 26 Aug 2019 12:11:23 +02:00
x86/apic: Fix arch_dynirq_lower_bound() bug for DT enabled machines
Rahul Tanwar reported the following bug on DT systems:
> 'ioapic_dynirq_base' contains the virtual IRQ base number. Presently, it is > updated to the end of hardware IRQ numbers but this is done only when IOAPIC > configuration type is IOAPIC_DOMAIN_LEGACY or IOAPIC_DOMAIN_STRICT. There is > a third type IOAPIC_DOMAIN_DYNAMIC which applies when IOAPIC configuration > comes from devicetree. > > See dtb_add_ioapic() in arch/x86/kernel/devicetree.c > > In case of IOAPIC_DOMAIN_DYNAMIC (DT/OF based system), 'ioapic_dynirq_base' > remains to zero initialized value. This means that for OF based systems, > virtual IRQ base will get set to zero.
Such systems will very likely not even boot.
For DT enabled machines ioapic_dynirq_base is irrelevant and not updated, so simply map the IRQ base 1:1 instead.
Reported-by: Rahul Tanwar <rahul.tanwar@linux.intel.com> Tested-by: Rahul Tanwar <rahul.tanwar@linux.intel.com> Tested-by: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: alan@linux.intel.com Cc: bp@alien8.de Cc: cheol.yong.kim@intel.com Cc: qi-ming.wu@intel.com Cc: rahul.tanwar@intel.com Cc: rppt@linux.ibm.com Cc: tony.luck@intel.com Link: http://lkml.kernel.org/r/20190821081330.1187-1-rahul.tanwar@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> --- arch/x86/kernel/apic/io_apic.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index c7bb6c6..d6af97f 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2438,7 +2438,13 @@ unsigned int arch_dynirq_lower_bound(unsigned int from) * dmar_alloc_hwirq() may be called before setup_IO_APIC(), so use * gsi_top if ioapic_dynirq_base hasn't been initialized yet. */ - return ioapic_initialized ? ioapic_dynirq_base : gsi_top; + if (!ioapic_initialized) + return gsi_top; + /* + * For DT enabled machines ioapic_dynirq_base is irrelevant and not + * updated. So simply return @from if ioapic_dynirq_base == 0. + */ + return ioapic_dynirq_base ? : from; } #ifdef CONFIG_X86_32
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