diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2016-07-04 17:39:23 +0900 |
|---|---|---|
| committer | Runmin Wang <runminw@codeaurora.org> | 2017-01-23 11:23:37 -0800 |
| commit | 1cc869442a204358ddb29d4c58cc4fd84847fe85 (patch) | |
| tree | c344875780e44935b1b0a58a44f130d570ac6e61 /kernel/irq/manage.c | |
| parent | 8fa25e8c0e83a27601cb2e4c30998e923e1bd96d (diff) | |
genirq: Introduce IRQD_AFFINITY_MANAGED flag
Interupts marked with this flag are excluded from user space interrupt
affinity changes. Contrary to the IRQ_NO_BALANCING flag, the kernel internal
affinity mechanism is not blocked.
This flag will be used for multi-queue device interrupts.
Change-Id: I204c49bb1c8ce87fbcd163119093163b120bfe83
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: linux-block@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Cc: axboe@fb.com
Cc: agordeev@redhat.com
Link: http://lkml.kernel.org/r/1467621574-8277-3-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Git-commit: 9c2555835bb3d34dfac52a0be943dcc4bedd650f
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[runminw@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Runmin Wang <runminw@codeaurora.org>
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 5cb153a8474a..e5c70dcb7f8e 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -115,12 +115,12 @@ EXPORT_SYMBOL(synchronize_irq); #ifdef CONFIG_SMP cpumask_var_t irq_default_affinity; -static int __irq_can_set_affinity(struct irq_desc *desc) +static bool __irq_can_set_affinity(struct irq_desc *desc) { if (!desc || !irqd_can_balance(&desc->irq_data) || !desc->irq_data.chip || !desc->irq_data.chip->irq_set_affinity) - return 0; - return 1; + return false; + return true; } /** @@ -134,6 +134,21 @@ int irq_can_set_affinity(unsigned int irq) } /** + * irq_can_set_affinity_usr - Check if affinity of a irq can be set from user space + * @irq: Interrupt to check + * + * Like irq_can_set_affinity() above, but additionally checks for the + * AFFINITY_MANAGED flag. + */ +bool irq_can_set_affinity_usr(unsigned int irq) +{ + struct irq_desc *desc = irq_to_desc(irq); + + return __irq_can_set_affinity(desc) && + !irqd_affinity_is_managed(&desc->irq_data); +} + +/** * irq_set_thread_affinity - Notify irq threads to adjust affinity * @desc: irq descriptor which has affitnity changed * |