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Message-ID: <1440497885-24584-1-git-send-email-gkulkarni@caviumnetworks.com>
Date: Tue, 25 Aug 2015 15:48:05 +0530
From: Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>
To: <marc.zyngier@....com>, <will.deacon@....com>,
<tglx@...utronix.de>, <jason@...edaemon.net>
CC: <linux-arm-kernel@...ts.infradead.org>,
<tirumalesh.chalamarla@...iumnetworks.com>, <rric@...nel.org>,
<robert.richter@...iumnetworks.com>, <gpkulkarni@...il.com>,
<linux-kernel@...r.kernel.org>
Subject: [PATCH v2] irqchip, gicv3-its, numa: Workaround for Cavium ThunderX erratum 23144
The patch below adds a workaround for gicv3 in a numa environment. It
is on top of Robert's recent gicv3 errata patch submission v4 and my
arm64 numa patches v5.
This implements a workaround for gicv3-its erratum 23144 on Cavium's
ThunderX dual-socket platforms, where LPI cannot be routed to a
redistributors present on a foreign node.
v2:
updatated as per Marc Zyngier's review comments.
Signed-off-by: Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>
Signed-off-by: Robert Richter <rrichter@...ium.com>
---
drivers/irqchip/irq-gic-v3-its.c | 53 +++++++++++++++++++++++++++++++++-------
1 file changed, 44 insertions(+), 9 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 614a367..d3fe0a4 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -40,7 +40,8 @@
#include "irqchip.h"
#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0)
-#define ITS_FLAGS_CAVIUM_THUNDERX (1ULL << 1)
+#define ITS_WORKAROUND_CAVIUM_22375 (1ULL << 1)
+#define ITS_WORKAROUND_CAVIUM_23144 (1ULL << 2)
#define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0)
@@ -73,6 +74,7 @@ struct its_node {
struct list_head its_device_list;
u64 flags;
u32 ite_size;
+ int numa_node;
};
#define ITS_ITT_ALIGN SZ_256
@@ -607,11 +609,20 @@ static void its_eoi_irq(struct irq_data *d)
static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
bool force)
{
- unsigned int cpu = cpumask_any_and(mask_val, cpu_online_mask);
+ unsigned int cpu;
+ const struct cpumask *cpu_mask = cpu_online_mask;
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
struct its_collection *target_col;
u32 id = its_get_event_id(d);
+ /* lpi cannot be routed to a redistributor that is on a foreign node */
+ if (its_dev->its->flags & ITS_WORKAROUND_CAVIUM_23144) {
+ cpu_mask = cpumask_of_node(its_dev->its->numa_node);
+ if (!cpumask_intersects(mask_val, cpu_mask))
+ return -EINVAL;
+ }
+
+ cpu = cpumask_any_and(mask_val, cpu_mask);
if (cpu >= nr_cpu_ids)
return -EINVAL;
@@ -1338,9 +1349,14 @@ static void its_irq_domain_activate(struct irq_domain *domain,
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
u32 event = its_get_event_id(d);
+ const struct cpumask *cpu_mask = cpu_online_mask;
+
+ /* get the cpu_mask of local node */
+ if (IS_ENABLED(CONFIG_NUMA))
+ cpu_mask = cpumask_of_node(its_dev->its->numa_node);
/* Bind the LPI to the first possible CPU */
- its_dev->event_map.col_map[event] = cpumask_first(cpu_online_mask);
+ its_dev->event_map.col_map[event] = cpumask_first(cpu_mask);
/* Map the GIC IRQ and event to the device */
its_send_mapvi(its_dev, d->hwirq, event);
@@ -1423,11 +1439,19 @@ static int its_force_quiescent(void __iomem *base)
}
}
-static void its_enable_cavium_thunderx(void *data)
+static void its_enable_cavium_thunderx_22375(void *data)
{
struct its_node *its = data;
- its->flags |= ITS_FLAGS_CAVIUM_THUNDERX;
+ its->flags |= ITS_WORKAROUND_CAVIUM_22375;
+}
+
+static void its_enable_cavium_thunderx_23144(void *data)
+{
+ struct its_node *its = data;
+
+ if (num_possible_nodes() > 1)
+ its->flags |= ITS_WORKAROUND_CAVIUM_23144;
}
static const struct gic_capabilities its_errata[] = {
@@ -1435,10 +1459,16 @@ static const struct gic_capabilities its_errata[] = {
.desc = "ITS: Cavium errata 22375, 24313",
.iidr = 0xa100034c, /* ThunderX pass 1.x */
.mask = 0xffff0fff,
- .init = its_enable_cavium_thunderx,
- },
- {
- }
+ .init = its_enable_cavium_thunderx_22375,
+ },
+ {
+ .desc = "ITS: Cavium errata 23144",
+ .iidr = 0xa100034c, /* ThunderX pass 1.x */
+ .mask = 0xffff0fff,
+ .init = its_enable_cavium_thunderx_23144,
+ },
+ {
+ }
};
static void its_enable_quirks(struct its_node *its)
@@ -1456,6 +1486,7 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
u32 val;
u64 baser, tmp;
int err;
+ int numa_node;
err = of_address_to_resource(node, 0, &res);
if (err) {
@@ -1463,6 +1494,9 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
return -ENXIO;
}
+ /* get numa affinity of its node*/
+ numa_node = of_node_to_nid(node);
+
its_base = ioremap(res.start, resource_size(&res));
if (!its_base) {
pr_warn("%s: unable to map registers\n", node->full_name);
@@ -1498,6 +1532,7 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
its->phys_base = res.start;
its->msi_chip.of_node = node;
its->ite_size = ((readl_relaxed(its_base + GITS_TYPER) >> 4) & 0xf) + 1;
+ its->numa_node = numa_node;
its->cmd_base = kzalloc(ITS_CMD_QUEUE_SZ, GFP_KERNEL);
if (!its->cmd_base) {
--
1.8.1.4
--
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