linux-kernel - [tip:x86/apic] x86, irq: Save destination CPU ID in irq

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Message-ID: <tip-489e71db03c76fa74d570133b51abe02b5192450@git.kernel.org>
Date:	Wed, 26 Nov 2014 15:05:48 -0800
From:	tip-bot for Jiang Liu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, benh@...nel.crashing.org, bp@...en8.de,
	tony.luck@...el.com, tglx@...utronix.de, jiang.liu@...ux.intel.com,
	rjw@...ysocki.net, hpa@...or.com, mingo@...nel.org,
	rdunlap@...radead.org, konrad.wilk@...cle.com, joro@...tes.org,
	linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
	yinghai@...nel.org
Subject: [tip:x86/apic] x86, irq: Save destination CPU ID in irq_cfg

Commit-ID:  489e71db03c76fa74d570133b51abe02b5192450
Gitweb:     http://git.kernel.org/tip/489e71db03c76fa74d570133b51abe02b5192450
Author:     Jiang Liu <jiang.liu@...ux.intel.com>
AuthorDate: Tue, 25 Nov 2014 13:53:10 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 26 Nov 2014 18:59:23 +0100

x86, irq: Save destination CPU ID in irq_cfg

Cache destination CPU APIC ID into struct irq_cfg when assigning vector
for interrupt. Upper layer just needs to read the cached APIC ID instead
of calling apic->cpu_mask_to_apicid_and(), it helps to hide APIC driver
details from IOAPIC/HPET/MSI drivers..

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Randy Dunlap <rdunlap@...radead.org>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Link: http://lkml.kernel.org/r/1416894816-23245-2-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/hw_irq.h | 1 +
 arch/x86/kernel/apic/vector.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/hw_irq.h b/arch/x86/include/asm/hw_irq.h
index 9662290..b988ddf 100644
--- a/arch/x86/include/asm/hw_irq.h
+++ b/arch/x86/include/asm/hw_irq.h
@@ -116,6 +116,7 @@ struct irq_data;
 struct irq_cfg {
 	cpumask_var_t		domain;
 	cpumask_var_t		old_domain;
+	unsigned int		dest_apicid;
 	u8			vector;
 	u8			move_in_progress : 1;
 #ifdef CONFIG_IRQ_REMAP
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 6cedd79..c724ef6 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -188,6 +188,12 @@ next:
 	}
 	free_cpumask_var(tmp_mask);
 
+	if (!err) {
+		/* cache destination APIC IDs into cfg->dest_apicid */
+		err = apic->cpu_mask_to_apicid_and(mask, cfg->domain,
+						   &cfg->dest_apicid);
+	}
+
 	return err;
 }
 
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