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x86/irq: change MSI irq_desc to be more numa aware

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Try to get irq_desc on the home node in create_irq_nr().

v2: don't check if we can move it when sparse_irq is not used
v3: use move_irq_des, if that node is not what we want

[ Impact: optimization, make MSI IRQ descriptors more NUMA aware ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <49F6559F.7070005@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-04-27 18:02:23 -07:00 committed by Ingo Molnar
parent 024154cfdd
commit d047f53a2e
2 changed files with 14 additions and 5 deletions
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17
arch/x86/kernel/apic/io_apic.c
View File

@ -3172,14 +3172,13 @@ static int nr_irqs_gsi = NR_IRQS_LEGACY;
/*
* Dynamic irq allocate and deallocation
*/
unsigned int create_irq_nr(unsigned int irq_want)
unsigned int create_irq_nr(unsigned int irq_want, int node)
{
/* Allocate an unused irq */
unsigned int irq;
unsigned int new;
unsigned long flags;
struct irq_cfg *cfg_new = NULL;
int node = cpu_to_node(boot_cpu_id);
struct irq_desc *desc_new = NULL;
irq = 0;
@ -3197,6 +3196,13 @@ unsigned int create_irq_nr(unsigned int irq_want)
if (cfg_new->vector != 0)
continue;
#ifdef CONFIG_NUMA_IRQ_DESC
/* different node ?*/
if (desc_new->node != node)
desc = move_irq_desc(desc, node);
#endif
if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0)
irq = new;
break;
@ -3214,11 +3220,12 @@ unsigned int create_irq_nr(unsigned int irq_want)
int create_irq(void)
{
int node = cpu_to_node(boot_cpu_id);
unsigned int irq_want;
int irq;
irq_want = nr_irqs_gsi;
irq = create_irq_nr(irq_want);
irq = create_irq_nr(irq_want, node);
if (irq == 0)
irq = -1;
@ -3476,15 +3483,17 @@ int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
unsigned int irq_want;
struct intel_iommu *iommu = NULL;
int index = 0;
int node;
/* x86 doesn't support multiple MSI yet */
if (type == PCI_CAP_ID_MSI && nvec > 1)
return 1;
node = dev_to_node(&dev->dev);
irq_want = nr_irqs_gsi;
sub_handle = 0;
list_for_each_entry(msidesc, &dev->msi_list, list) {
irq = create_irq_nr(irq_want);
irq = create_irq_nr(irq_want, node);
if (irq == 0)
return -1;
irq_want = irq + 1;

2
include/linux/irq.h
View File

@ -376,7 +376,7 @@ extern void set_irq_noprobe(unsigned int irq);
extern void set_irq_probe(unsigned int irq);
/* Handle dynamic irq creation and destruction */
extern unsigned int create_irq_nr(unsigned int irq_want);
extern unsigned int create_irq_nr(unsigned int irq_want, int node);
extern int create_irq(void);
extern void destroy_irq(unsigned int irq);