linux-kernel - [PATCH 05/10] irqchip/gic-v3-its: Make GICv4_ITS_LIST

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Date:   Tue, 10 Oct 2017 13:51:32 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Shanker Donthineni <shankerd@...eaurora.org>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Christoffer Dall <cdall@...aro.org>,
        Eric Auger <eric.auger@...hat.com>
Subject: [PATCH 05/10] irqchip/gic-v3-its: Make GICv4_ITS_LIST_MAX globally available

As we're about to make use of the maximum number of ITSs in
a GICv4 system, let's make this value global (and rename it to
GICv4_ITS_LIST_MAX).

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
---
 drivers/irqchip/irq-gic-v3-its.c   | 10 ++--------
 include/linux/irqchip/arm-gic-v4.h |  6 ++++++
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 24ffb19c559d..8a1f985c8558 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -150,12 +150,6 @@ static DEFINE_SPINLOCK(its_lock);
 static struct rdists *gic_rdists;
 static struct irq_domain *its_parent;
 
-/*
- * We have a maximum number of 16 ITSs in the whole system if we're
- * using the ITSList mechanism
- */
-#define ITS_LIST_MAX		16
-
 static unsigned long its_list_map;
 static u16 vmovp_seq_num;
 static DEFINE_RAW_SPINLOCK(vmovp_lock);
@@ -2921,8 +2915,8 @@ static int __init its_compute_its_list_map(struct resource *res,
 	 * locking. Should this change, we should address
 	 * this.
 	 */
-	its_number = find_first_zero_bit(&its_list_map, ITS_LIST_MAX);
-	if (its_number >= ITS_LIST_MAX) {
+	its_number = find_first_zero_bit(&its_list_map, GICv4_ITS_LIST_MAX);
+	if (its_number >= GICv4_ITS_LIST_MAX) {
 		pr_err("ITS@%pa: No ITSList entry available!\n",
 		       &res->start);
 		return -EINVAL;
diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm-gic-v4.h
index 58a4d89aa82c..e26a668826e6 100644
--- a/include/linux/irqchip/arm-gic-v4.h
+++ b/include/linux/irqchip/arm-gic-v4.h
@@ -20,6 +20,12 @@
 
 struct its_vpe;
 
+/*
+ * Maximum number of ITTs when GITS_TYPER.VMOVP == 0, using the
+ * ITSList mechanism to perform inter-ITS synchronization.
+ */
+#define GICv4_ITS_LIST_MAX		16
+
 /* Embedded in kvm.arch */
 struct its_vm {
 	struct fwnode_handle	*fwnode;
-- 
2.11.0