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From: Jiang Liu <jiang.liu@linux.intel.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Randy Dunlap <rdunlap@infradead.org>,
	Yinghai Lu <yinghai@kernel.org>, Borislav Petkov <bp@alien8.de>,
	Dimitri Sivanich <sivanich@sgi.com>,
	x86@kernel.org, Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	David Cohen <david.a.cohen@linux.intel.com>,
	Sander Eikelenboom <linux@eikelenboom.it>,
	David Vrabel <david.vrabel@citrix.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tony Luck <tony.luck@intel.com>, Joerg Roedel <joro@8bytes.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-acpi@vger.kernel.org
Subject: [Patch Part2 v4 33/33] x86/irq: Avoid memory allocation in __assign_irq_vector()
Date: Tue, 20 Jan 2015 13:51:53 +0800	[thread overview]
Message-ID: <1421733113-15704-34-git-send-email-jiang.liu@linux.intel.com> (raw)
In-Reply-To: <1421733113-15704-1-git-send-email-jiang.liu@linux.intel.com>

Function __assign_irq_vector() is protected by vector_lock, so use
a global temporary cpu_mask to avoid allocating/freeing cpu_mask.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
---
 arch/x86/kernel/apic/vector.c |   33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index f5eb3999383f..4a04b25cdcdf 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -30,6 +30,7 @@ struct apic_chip_data {
 
 struct irq_domain *x86_vector_domain;
 static DEFINE_RAW_SPINLOCK(vector_lock);
+static cpumask_var_t vector_cpumask;
 static struct irq_chip lapic_controller;
 #ifdef	CONFIG_X86_IO_APIC
 static struct apic_chip_data *legacy_irq_data[NR_IRQS_LEGACY];
@@ -116,14 +117,10 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
 	static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
 	static int current_offset = VECTOR_OFFSET_START % 16;
 	int cpu, err;
-	cpumask_var_t tmp_mask;
 
 	if (d->move_in_progress)
 		return -EBUSY;
 
-	if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
-		return -ENOMEM;
-
 	/* Only try and allocate irqs on cpus that are present */
 	err = -ENOSPC;
 	cpumask_clear(d->old_domain);
@@ -131,21 +128,22 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
 	while (cpu < nr_cpu_ids) {
 		int new_cpu, vector, offset;
 
-		apic->vector_allocation_domain(cpu, tmp_mask, mask);
+		apic->vector_allocation_domain(cpu, vector_cpumask, mask);
 
-		if (cpumask_subset(tmp_mask, d->domain)) {
+		if (cpumask_subset(vector_cpumask, d->domain)) {
 			err = 0;
-			if (cpumask_equal(tmp_mask, d->domain))
+			if (cpumask_equal(vector_cpumask, d->domain))
 				break;
 			/*
 			 * New cpumask using the vector is a proper subset of
 			 * the current in use mask. So cleanup the vector
 			 * allocation for the members that are not used anymore.
 			 */
-			cpumask_andnot(d->old_domain, d->domain, tmp_mask);
+			cpumask_andnot(d->old_domain, d->domain,
+				       vector_cpumask);
 			d->move_in_progress =
 			   cpumask_intersects(d->old_domain, cpu_online_mask);
-			cpumask_and(d->domain, d->domain, tmp_mask);
+			cpumask_and(d->domain, d->domain, vector_cpumask);
 			break;
 		}
 
@@ -159,16 +157,18 @@ next:
 		}
 
 		if (unlikely(current_vector == vector)) {
-			cpumask_or(d->old_domain, d->old_domain, tmp_mask);
-			cpumask_andnot(tmp_mask, mask, d->old_domain);
-			cpu = cpumask_first_and(tmp_mask, cpu_online_mask);
+			cpumask_or(d->old_domain, d->old_domain,
+				   vector_cpumask);
+			cpumask_andnot(vector_cpumask, mask, d->old_domain);
+			cpu = cpumask_first_and(vector_cpumask,
+						cpu_online_mask);
 			continue;
 		}
 
 		if (test_bit(vector, used_vectors))
 			goto next;
 
-		for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask) {
+		for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask) {
 			if (per_cpu(vector_irq, new_cpu)[vector] >
 			    VECTOR_UNDEFINED)
 				goto next;
@@ -181,14 +181,13 @@ next:
 			d->move_in_progress =
 			   cpumask_intersects(d->old_domain, cpu_online_mask);
 		}
-		for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask)
+		for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask)
 			per_cpu(vector_irq, new_cpu)[vector] = irq;
 		d->cfg.vector = vector;
-		cpumask_copy(d->domain, tmp_mask);
+		cpumask_copy(d->domain, vector_cpumask);
 		err = 0;
 		break;
 	}
-	free_cpumask_var(tmp_mask);
 
 	if (!err) {
 		/* cache destination APIC IDs into cfg->dest_apicid */
@@ -397,6 +396,8 @@ int __init arch_early_irq_init(void)
 	arch_init_msi_domain(x86_vector_domain);
 	arch_init_htirq_domain(x86_vector_domain);
 
+	BUG_ON(!alloc_cpumask_var(&vector_cpumask, GFP_KERNEL));
+
 	return arch_early_ioapic_init();
 }
 
-- 
1.7.10.4


  parent reply	other threads:[~2015-01-20  5:57 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-20  5:51 [Patch Part2 v4 00/33] Clean up obsoleted x86 interrupt manangement code and interfaces Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 01/33] x86/irq: Kill unused old IOAPIC irqdomain interfaces Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 02/33] x86/irq: Kill unused struct mp_pin_info Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 03/33] x86/irq: Kill x86_io_apic_ops.print_entries and related interfaces Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 04/33] x86/irq: Kill x86_io_apic_ops.setup_entry " Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 05/33] x86/irq: Kill x86_io_apic_ops.set_affinity " Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 06/33] x86/irq: Kill x86_io_apic_ops.eoi_ioapic_pin " Jiang Liu
2015-01-28  1:56   ` [Patch Part2 v4] " Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 07/33] x86/irq: Kill GENERIC_IRQ_LEGACY_ALLOC_HWIRQ Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 08/33] x86/irq: Clean up unused forward declarations in x86_init.h Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 09/33] irq_remapping: Clean up unsued code to support IOAPIC Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 10/33] irq_remapping/vt-d: Clean up unsued code Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 11/33] irq_remapping/amd: " Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 12/33] irq_remapping: Clean up unused interfaces Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 13/33] x86/irq: Kill irq_cfg.irq_remapped Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 14/33] irq_remapping/vt-d: Move struct irq_2_iommu into intel_irq_remapping.c Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 15/33] irq_remapping/amd: Move struct irq_2_irte into amd_iommu.c Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 16/33] x86/irq: Move irq_cfg.irq_2_pin into io_apic.c Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 17/33] x86/irq: Kill struct io_apic_irq_attr Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 18/33] x86/irq: Kill x86_io_apic_ops.write and x86_io_apic_ops.modify Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 19/33] x86/irq: Clean up io_apic.h Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 20/33] x86/irq: Use cached IOAPIC entry instead of reading from hardware Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 21/33] x86/irq: Remove sis apic bug workaround Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 22/33] x86/irq: Kill unused alloc_irq_and_cfg_at() Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 23/33] x86/irq: Change functions only used in vector.c as static Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 24/33] x86/irq: Kill function apic_set_affinity() Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 25/33] x86/irq: Move check of cfg->move_in_progress into send_cleanup_vector() Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 26/33] x86/irq: Move private data in struct irq_cfg into dedicated data structure Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 27/33] x86/irq: Refine the way to calculate NR_IRQS Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 28/33] x86/irq, ACPI: Kill private function mp_register_gsi()/ mp_unregister_gsi() Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 29/33] x86, ioapic: Use proper defines for the entry fields Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 30/33] x86,ioapic: Cleanup irq_trigger/polarity() Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 31/33] x86: Cleanup irq_domain ops Jiang Liu
2015-01-20  5:51 ` [Patch Part2 v4 32/33] x86/irq: Move irqdomain specific code into asm/irqdomain.h Jiang Liu
2015-01-20  5:51 ` Jiang Liu [this message]
2015-02-03  2:52 ` [Patch Part2 v4 00/33] Clean up obsoleted x86 interrupt manangement code and interfaces Jiang Liu

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