linux-kernel - [PATCH 7/9] irqchip/gic-v3: Dynamically allocate PPI partition descriptors

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190723104437.154403-8-maz@kernel.org>
Date:   Tue, 23 Jul 2019 11:44:35 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 7/9] irqchip/gic-v3: Dynamically allocate PPI partition descriptors

Again, PPIs are becoming a variable set. Let's hack the PPI partition
code to make the top-level array dynamically allocated.

Signed-off-by: Marc Zyngier <maz@...nel.org>
---
 drivers/irqchip/irq-gic-v3.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index ec0f885fa373..b85acab4a6a1 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -52,7 +52,7 @@ struct gic_chip_data {
 	u64			flags;
 	bool			has_rss;
 	unsigned int		ppi_nr;
-	struct partition_desc	*ppi_descs[16];
+	struct partition_desc	**ppi_descs;
 };
 
 static struct gic_chip_data gic_data __read_mostly;
@@ -1350,7 +1350,8 @@ static int gic_irq_domain_select(struct irq_domain *d,
 	 * then we need to match the partition domain.
 	 */
 	if (fwspec->param_count >= 4 &&
-	    fwspec->param[0] == 1 && fwspec->param[3] != 0)
+	    fwspec->param[0] == 1 && fwspec->param[3] != 0 &&
+	    gic_data.ppi_descs)
 		return d == partition_get_domain(gic_data.ppi_descs[fwspec->param[1]]);
 
 	return d == gic_data.domain;
@@ -1371,6 +1372,9 @@ static int partition_domain_translate(struct irq_domain *d,
 	struct device_node *np;
 	int ret;
 
+	if (!gic_data.ppi_descs)
+		return -ENOMEM;
+
 	np = of_find_node_by_phandle(fwspec->param[3]);
 	if (WARN_ON(!np))
 		return -EINVAL;
@@ -1527,6 +1531,10 @@ static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
 	if (!parts_node)
 		return;
 
+	gic_data.ppi_descs = kcalloc(gic_data.ppi_nr, sizeof(*gic_data.ppi_descs), GFP_KERNEL);
+	if (!gic_data.ppi_descs)
+		return;
+
 	nr_parts = of_get_child_count(parts_node);
 
 	if (!nr_parts)
@@ -1578,7 +1586,7 @@ static void __init gic_populate_ppi_partitions(struct device_node *gic_node)
 		part_idx++;
 	}
 
-	for (i = 0; i < 16; i++) {
+	for (i = 0; i < gic_data.ppi_nr; i++) {
 		unsigned int irq;
 		struct partition_desc *desc;
 		struct irq_fwspec ppi_fwspec = {
-- 
2.20.1