linux-kernel - [RFC Patch Part1 V1 17/30] x86, irq: introduce some helper utilities to improve readability

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Date:	Fri, 16 May 2014 16:05:37 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	Jiang Liu <jiang.liu@...ux.intel.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, sfi-devel@...plefirmware.org,
	Ingo Molnar <mingo@...nel.org>
Subject: [RFC Patch Part1 V1 17/30] x86, irq: introduce some helper utilities to improve readability

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 arch/x86/kernel/apic/io_apic.c |   41 +++++++++++++++++++++++++++++-----------
 1 file changed, 30 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index dd81b58cce95..faed9b62977d 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -117,6 +117,26 @@ struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
 	return &ioapics[ioapic_idx].gsi_config;
 }
 
+static inline int mp_ioapic_pin_count(int ioapic)
+{
+	struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
+
+	return gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
+}
+
+static inline u32 mp_pin_2_gsi(int ioapic, int pin)
+{
+	return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin;
+}
+
+/* Initialize all legacy IRQs and all pins on the first IOAPIC at boot */
+static inline int mp_init_pin_at_boot(int ioapic, int pin)
+{
+	u32 gsi = mp_pin_2_gsi(ioapic, pin);
+
+	return ioapic == 0 || gsi < NR_IRQS_LEGACY;
+}
+
 int nr_ioapics;
 
 /* The one past the highest gsi number used */
@@ -1378,15 +1398,15 @@ static void __init __io_apic_setup_irqs(unsigned int ioapic_idx)
 	unsigned int pin, irq;
 
 	for_each_pin(ioapic_idx, pin) {
+		if (!mp_init_pin_at_boot(ioapic_idx, pin))
+			continue;
+
 		idx = find_irq_entry(ioapic_idx, pin, mp_INT);
 		if (io_apic_pin_not_connected(idx, ioapic_idx, pin))
 			continue;
 
 		irq = pin_2_irq(idx, ioapic_idx, pin);
 
-		if ((ioapic_idx > 0) && (irq > NR_IRQS_LEGACY))
-			continue;
-
 		/*
 		 * Skip the timer IRQ if there's a quirk handler
 		 * installed and if it returns 1:
@@ -1430,16 +1450,15 @@ void setup_IO_APIC_irq_extra(u32 gsi)
 		return;
 
 	pin = mp_find_ioapic_pin(ioapic_idx, gsi);
+	if (mp_init_pin_at_boot(ioapic_idx, pin))
+		return;
+
 	idx = find_irq_entry(ioapic_idx, pin, mp_INT);
 	if (idx == -1)
 		return;
 
 	irq = pin_2_irq(idx, ioapic_idx, pin);
 
-	/* Only handle the non legacy irqs on secondary ioapics */
-	if (ioapic_idx == 0 || irq < NR_IRQS_LEGACY)
-		return;
-
 	set_io_apic_irq_attr(&attr, ioapic_idx, pin, irq_trigger(idx),
 			     irq_polarity(idx));
 
@@ -3605,14 +3624,14 @@ void __init setup_ioapic_dest(void)
 		return;
 
 	for_each_ioapic_pin(ioapic, pin) {
-		irq_entry = find_irq_entry(ioapic, pin, mp_INT);
-		if (irq_entry == -1)
+		if (!mp_init_pin_at_boot(ioapic, pin))
 			continue;
-		irq = pin_2_irq(irq_entry, ioapic, pin);
 
-		if ((ioapic > 0) && (irq > NR_IRQS_LEGACY))
+		irq_entry = find_irq_entry(ioapic, pin, mp_INT);
+		if (irq_entry == -1)
 			continue;
 
+		irq = pin_2_irq(irq_entry, ioapic, pin);
 		idata = irq_get_irq_data(irq);
 
 		/*
-- 
1.7.10.4

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