[PATCH v9 27/36] x86/traps: Add external_interrupt() to dispatch external interrupts

* [PATCH v9 27/36] x86/traps: Add external_interrupt() to dispatch external interrupts
@ 2023-07-31  6:40 Xin Li
  0 siblings, 0 replies; only message in thread
From: Xin Li @ 2023-07-31  6:40 UTC (permalink / raw)
  To: linux-doc, linux-kernel, linux-edac, linux-hyperv, kvm, xen-devel
  Cc: Jonathan Corbet, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
	Dave Hansen, x86, H . Peter Anvin, Andy Lutomirski,
	Oleg Nesterov, Tony Luck, K . Y . Srinivasan, Haiyang Zhang,
	Wei Liu, Dexuan Cui, Paolo Bonzini, Wanpeng Li, Vitaly Kuznetsov,
	Sean Christopherson, Peter Zijlstra, Juergen Gross,
	Stefano Stabellini, Oleksandr Tyshchenko, Josh Poimboeuf,
	Paul E . McKenney, Catalin Marinas, Randy Dunlap, Steven Rostedt,
	Kim Phillips, Xin Li, Hyeonggon Yoo, Liam R . Howlett,
	Sebastian Reichel, Kirill A . Shutemov, Suren Baghdasaryan,
	Pawan Gupta, Jiaxi Chen, Babu Moger, Jim Mattson, Sandipan Das,
	Lai Jiangshan, Hans de Goede, Reinette Chatre, Daniel Sneddon,
	Breno Leitao, Nikunj A Dadhania, Brian Gerst, Sami Tolvanen,
	Alexander Potapenko, Andrew Morton, Arnd Bergmann,
	Eric W . Biederman, Kees Cook, Masami Hiramatsu, Masahiro Yamada,
	Ze Gao, Fei Li, Conghui, Ashok Raj, Jason A . Donenfeld,
	Mark Rutland, Jacob Pan, Jiapeng Chong, Jane Malalane,
	David Woodhouse, Boris Ostrovsky, Arnaldo Carvalho de Melo,
	Yantengsi, Christophe Leroy, Sathvika Vasireddy

From: "H. Peter Anvin (Intel)" <hpa@zytor.com>

external_interrupt() dispatches all external interrupts: it checks if an
external interrupt is a system interrupt, if yes it dipatches it through
the system_interrupt_handlers table, otherwise to
dispatch_common_interrupt().

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Co-developed-by: Xin Li <xin3.li@intel.com>
Tested-by: Shan Kang <shan.kang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
---

Changes since v8:
* Reword the patch description, which was confusing (Thomas Gleixner).

Changes since v5:
* Initialize system_interrupt_handlers with dispatch_table_spurious_interrupt()
  instead of NULL to get rid of a branch (Peter Zijlstra).
---
 arch/x86/include/asm/traps.h |  2 ++
 arch/x86/kernel/traps.c      | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index cba3e4dfc329..48daa78ee88c 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -66,4 +66,6 @@ static inline void sysvec_setup_fred(unsigned int vector, system_interrupt_handl
 	alloc_intr_gate(vector, asm_##func);				\
 }
 
+int external_interrupt(struct pt_regs *regs);
+
 #endif /* _ASM_X86_TRAPS_H */
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 9040c7f01c93..90fdfcccee7a 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1542,6 +1542,24 @@ void set_sysvec_handler(unsigned int i, system_interrupt_handler func)
 	system_interrupt_handlers[i] = func;
 }
 
+int external_interrupt(struct pt_regs *regs)
+{
+	unsigned int vector = regs->vector;
+	unsigned int sysvec = vector - FIRST_SYSTEM_VECTOR;
+
+	if (unlikely(vector < FIRST_EXTERNAL_VECTOR)) {
+		pr_err("invalid external interrupt vector %d\n", vector);
+		return -EINVAL;
+	}
+
+	if (sysvec < NR_SYSTEM_VECTORS)
+		system_interrupt_handlers[sysvec](regs);
+	else
+		dispatch_common_interrupt(regs, vector);
+
+	return 0;
+}
+
 #endif /* CONFIG_X86_64 */
 
 void __init trap_init(void)
-- 
2.34.1


^ permalink raw reply related	[flat|nested] only message in thread