linux-kernel - [PATCH v5 13/33] x86, irq: Add alloc_reserved_irq_and_cfg

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1388707565-16535-14-git-send-email-yinghai@kernel.org>
Date:	Thu,  2 Jan 2014 16:05:45 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
	Joerg Roedel <joro@...tes.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Subject: [PATCH v5 13/33] x86, irq: Add alloc_reserved_irq_and_cfg_at()

For ioapic hot-add support, it would be easy if we have continuous
irq numbers for new added ioapic controller.

We can reserve irq range at first, then allocate those
pre-reserved one when it is needed.

Add alloc_reserved_irq_and_cfg_at() to really allocate irq_desc and cfg,
because pre-reserved only mark bits in allocate_irqs bit maps.

Also fallback to alloc_irq_and_cfg_at(), and it is needed as
we do not actually reserved irq for io apic irq yet.

This patch is x86 arch code.

-v2: update changelog by adding reasons, requested by Konrad.
-v3: according to tglx, separate to another patch, and use
     alloc_reserved_... instead of realloc_...
     also add handling for one possible path in
       alloc_reserved_irq_and_cfg_at().

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
---
 arch/x86/kernel/apic/io_apic.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index b943012..4b836ea 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -301,6 +301,29 @@ static void free_irq_at(unsigned int at, struct irq_cfg *cfg)
 	irq_free_desc(at);
 }
 
+static struct irq_cfg *alloc_reserved_irq_and_cfg_at(unsigned int at, int node)
+{
+	struct irq_cfg *cfg;
+	int res;
+
+	res = irq_alloc_reserved_desc_at(at, node);
+
+	if (res >= 0) {
+		cfg = irq_desc_get_chip_data(irq_to_desc(at));
+		if (cfg)
+			return cfg;
+
+		cfg = alloc_irq_cfg(at, node);
+		if (cfg)
+			irq_set_chip_data(at, cfg);
+		else
+			irq_free_desc(at);
+
+		return cfg;
+	}
+
+	return alloc_irq_and_cfg_at(at, node);
+}
 
 struct io_apic {
 	unsigned int index;
@@ -3357,7 +3380,7 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
 static int
 io_apic_setup_irq_pin(unsigned int irq, int node, struct io_apic_irq_attr *attr)
 {
-	struct irq_cfg *cfg = alloc_irq_and_cfg_at(irq, node);
+	struct irq_cfg *cfg = alloc_reserved_irq_and_cfg_at(irq, node);
 	int ret;
 
 	if (!cfg)
-- 
1.8.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/