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Message-Id: <20190919214811.667982823@linuxfoundation.org>
Date: Fri, 20 Sep 2019 00:03:31 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Rahul Tanwar <rahul.tanwar@...ux.intel.com>,
Andy Shevchenko <andriy.shevchenko@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>, alan@...ux.intel.com,
bp@...en8.de, cheol.yong.kim@...el.com, qi-ming.wu@...el.com,
rahul.tanwar@...el.com, rppt@...ux.ibm.com, tony.luck@...el.com,
Ingo Molnar <mingo@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 46/79] x86/apic: Fix arch_dynirq_lower_bound() bug for DT enabled machines
From: Thomas Gleixner <tglx@...utronix.de>
[ Upstream commit 3e5bedc2c258341702ddffbd7688c5e6eb01eafa ]
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@...ux.intel.com>
Tested-by: Rahul Tanwar <rahul.tanwar@...ux.intel.com>
Tested-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: alan@...ux.intel.com
Cc: bp@...en8.de
Cc: cheol.yong.kim@...el.com
Cc: qi-ming.wu@...el.com
Cc: rahul.tanwar@...el.com
Cc: rppt@...ux.ibm.com
Cc: tony.luck@...el.com
Link: http://lkml.kernel.org/r/20190821081330.1187-1-rahul.tanwar@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 4077e309e5c4c..ab22eded61d25 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2432,7 +2432,13 @@ 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
--
2.20.1
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