[irqchip: irq/irqchip-fixes] irqchip/gic-v3-its: Remove cpumask_var_t allocation

["irqchip-bot for Pierre Gondois" <tip-bot2@linutronix.de>]

The following commit has been merged into the irq/irqchip-fixes branch of irqchip:

Commit-ID:     f55a9b59e8f06e034368aeb48625359194e41f0e
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/f55a9b59e8f06e034368aeb48625359194e41f0e
Author:        Pierre Gondois <pierre.gondois@arm.com>
AuthorDate:    Mon, 12 Sep 2022 16:18:57 +02:00
Committer:     Marc Zyngier <maz@kernel.org>
CommitterDate: Mon, 12 Sep 2022 16:37:43 +01:00

irqchip/gic-v3-its: Remove cpumask_var_t allocation

Running a PREEMPT_RT kernel based on v5.19-rc3-rt4 on an Ampere Altra
triggers:

[   22.616229] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46
[   22.616239] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 1884, name: kworker/80:1
[   22.616243] preempt_count: 3, expected: 0
[   22.616244] RCU nest depth: 0, expected: 0
[...]
[   22.616250] hardirqs last enabled at (33): _raw_spin_unlock_irq (/home/piegon01/linux/./arch/arm64/include/asm/irqflags.h:35)
[   22.616273] hardirqs last disabled at (34): __schedule (/home/piegon01/linux/kernel/sched/core.c:6432 (discriminator 1))
[   22.616283] softirqs last enabled at (0): copy_process (/home/piegon01/linux/./include/linux/lockdep.h:191)
[   22.616297] softirqs last disabled at (0): 0x0
[   22.616305] Preemption disabled at:
[   22.616307] __setup_irq (/home/piegon01/linux/kernel/irq/manage.c:1612)
[   22.616322] CPU: 80 PID: 1884 Comm: kworker/80:1 Tainted: G        W        [...]
[   22.616328] Hardware name: WIWYNN Mt.Jade Server System B81.03001.0005/Mt.Jade Motherboard, BIOS 1.08.20220218 (SCP: 1.08.20220218) 2022/02/18
[   22.616333] Workqueue: events work_for_cpu_fn
[   22.616344] Call trace:
[...]
[   22.616403] alloc_cpumask_var_node (/home/piegon01/linux/lib/cpumask.c:115)
[   22.616414] alloc_cpumask_var (/home/piegon01/linux/lib/cpumask.c:147)
[   22.616417] its_select_cpu (/home/piegon01/linux/drivers/irqchip/irq-gic-v3-its.c:1580)
[   22.616428] its_set_affinity (/home/piegon01/linux/drivers/irqchip/irq-gic-v3-its.c:1659)
[   22.616431] msi_domain_set_affinity (/home/piegon01/linux/kernel/irq/msi.c:501)
[   22.616440] irq_do_set_affinity (/home/piegon01/linux/kernel/irq/manage.c:276)
[   22.616443] irq_setup_affinity (/home/piegon01/linux/kernel/irq/manage.c:633)
[   22.616447] irq_startup (/home/piegon01/linux/kernel/irq/chip.c:280)
[   22.616453] __setup_irq (/home/piegon01/linux/kernel/irq/manage.c:1777)

Follow the pattern established in commit cba4235e6031e ("genirq: Remove
mask argument from setup_affinity()") and co to overcome this issue by
defining a static struct cpumask and protecting it by a raw spinlock.

Since its_select_cpu() can be executed with IRQs enabled or disabled,
enforce that the cpumask computation is done with interrupts disabled.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220912141857.1391343-1-pierre.gondois@arm.com
---
 drivers/irqchip/irq-gic-v3-its.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 5ff09de..beead1a 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1574,13 +1574,15 @@ static int its_select_cpu(struct irq_data *d,
 			  const struct cpumask *aff_mask)
 {
 	struct its_device *its_dev = irq_data_get_irq_chip_data(d);
-	cpumask_var_t tmpmask;
+	static DEFINE_RAW_SPINLOCK(tmpmask_lock);
+	static struct cpumask __tmpmask;
+	struct cpumask *tmpmask;
+	unsigned long flags;
 	int cpu, node;
-
-	if (!alloc_cpumask_var(&tmpmask, GFP_ATOMIC))
-		return -ENOMEM;
-
 	node = its_dev->its->numa_node;
+	tmpmask = &__tmpmask;
+
+	raw_spin_lock_irqsave(&tmpmask_lock, flags);
 
 	if (!irqd_affinity_is_managed(d)) {
 		/* First try the NUMA node */
@@ -1634,7 +1636,7 @@ static int its_select_cpu(struct irq_data *d,
 		cpu = cpumask_pick_least_loaded(d, tmpmask);
 	}
 out:
-	free_cpumask_var(tmpmask);
+	raw_spin_unlock_irqrestore(&tmpmask_lock, flags);
 
 	pr_debug("IRQ%d -> %*pbl CPU%d\n", d->irq, cpumask_pr_args(aff_mask), cpu);
 	return cpu;