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Date: Mon, 13 Jul 2015 16:14:23 +0700
From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To: <tglx@...utronix.de>, <marc.zyngier@....com>,
<lorenzo.pieralisi@....com>, <hanjun.guo@...aro.org>,
<tomasz.nowicki@...aro.org>
CC: <rjw@...ysocki.net>, <al.stone@...aro.org>,
<catalin.marinas@....com>, <will.deacon@....com>,
<msalter@...hat.com>, <grant.likely@...aro.org>,
<leo.duran@....com>, <sherry.hurwitz@....com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: [RFCv2 PATCH 7/8] gicv2m: Introducing gicv2m_acpi_init()
This patch introduces gicv2m_acpi_init(), which parse MADT GIC MSI frames,
and use information to initialize GICv2m. It also refactors
gicv2m_init_one() to handle both DT and ACPI initialization path.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
---
NOTE:
Now that we are setting v2m->domain->bus_token to DOMAIN_BUS_PCI_MSI,
this limits the scope of this particular domain to just PCI-MSI-related
stuff. I am not sure if it would be acceptable to use MSI frame handle as
a reference to assign to v2m->domain->of_node. This same concern is also
applied to patch 8 where we bind the GIC MSI frame to PCI host bridge.
Any suggestions/feedbacks are welcomed.
Thanks,
Suravee
drivers/irqchip/irq-gic-v2m.c | 106 +++++++++++++++++++++++++++++++++-------
drivers/irqchip/irq-gic.c | 3 ++
include/linux/irqchip/arm-gic.h | 13 +++++
3 files changed, 104 insertions(+), 18 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index e4e2a92..c0417e1 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -15,6 +15,7 @@
#define pr_fmt(fmt) "GICv2m: " fmt
+#include <linux/acpi.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
@@ -219,8 +220,14 @@ static bool is_msi_spi_valid(u32 base, u32 num)
return true;
}
-static int __init gicv2m_init_one(struct device_node *node,
- struct irq_domain *parent)
+char gicv2m_domain_name[] = "GICV2M";
+char gicv2m_msi_domain_name[] = "V2M-MSI";
+
+static int __init gicv2m_init_one(struct irq_domain *parent,
+ u32 *spi_start, u32 *nr_spis,
+ struct resource *res,
+ struct device_node *node,
+ void *msi_frame)
{
int ret;
struct v2m_data *v2m;
@@ -232,23 +239,17 @@ static int __init gicv2m_init_one(struct device_node *node,
return -ENOMEM;
}
- ret = of_address_to_resource(node, 0, &v2m->res);
- if (ret) {
- pr_err("Failed to allocate v2m resource.\n");
- goto err_free_v2m;
- }
-
- v2m->base = ioremap(v2m->res.start, resource_size(&v2m->res));
+ v2m->base = ioremap(res->start, resource_size(res));
if (!v2m->base) {
pr_err("Failed to map GICv2m resource\n");
ret = -ENOMEM;
goto err_free_v2m;
}
+ memcpy(&v2m->res, res, sizeof(struct resource));
- if (!of_property_read_u32(node, "arm,msi-base-spi", &v2m->spi_start) &&
- !of_property_read_u32(node, "arm,msi-num-spis", &v2m->nr_spis)) {
- pr_info("Overriding V2M MSI_TYPER (base:%u, num:%u)\n",
- v2m->spi_start, v2m->nr_spis);
+ if (*spi_start && *nr_spis) {
+ v2m->spi_start = *spi_start;
+ v2m->nr_spis = *nr_spis;
} else {
u32 typer = readl_relaxed(v2m->base + V2M_MSI_TYPER);
@@ -277,6 +278,8 @@ static int __init gicv2m_init_one(struct device_node *node,
inner_domain->bus_token = DOMAIN_BUS_PLATFORM_MSI;
inner_domain->parent = parent;
+ inner_domain->name = gicv2m_domain_name;
+
v2m->domain = pci_msi_create_irq_domain(node, &gicv2m_msi_domain_info,
inner_domain);
if (!v2m->domain) {
@@ -285,11 +288,11 @@ static int __init gicv2m_init_one(struct device_node *node,
goto err_free_domains;
}
- spin_lock_init(&v2m->msi_cnt_lock);
+ v2m->domain->name = gicv2m_msi_domain_name;
+ if (!acpi_disabled)
+ v2m->domain->of_node = msi_frame;
- pr_info("Node %s: range[%#lx:%#lx], SPI[%d:%d]\n", node->name,
- (unsigned long)v2m->res.start, (unsigned long)v2m->res.end,
- v2m->spi_start, (v2m->spi_start + v2m->nr_spis));
+ spin_lock_init(&v2m->msi_cnt_lock);
return 0;
@@ -319,15 +322,82 @@ int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent)
for (child = of_find_matching_node(node, gicv2m_device_id); child;
child = of_find_matching_node(child, gicv2m_device_id)) {
+ u32 spi_start = 0, nr_spis = 0;
+ struct resource res;
+
if (!of_find_property(child, "msi-controller", NULL))
continue;
- ret = gicv2m_init_one(child, parent);
+ ret = of_address_to_resource(child, 0, &res);
+ if (ret) {
+ pr_err("Failed to allocate v2m resource.\n");
+ break;
+ }
+
+ if (!of_property_read_u32(child, "arm,msi-base-spi", &spi_start) &&
+ !of_property_read_u32(child, "arm,msi-num-spis", &nr_spis))
+ pr_info("Overriding V2M MSI_TYPER (base:%u, num:%u)\n",
+ spi_start, nr_spis);
+
+ ret = gicv2m_init_one(parent, &spi_start, &nr_spis, &res,
+ child, NULL);
if (ret) {
of_node_put(node);
break;
}
+
+ pr_info("Node %s: range[%#lx:%#lx], SPI[%d:%d]\n", child->name,
+ (unsigned long)res.start, (unsigned long)res.end,
+ spi_start, (spi_start + nr_spis));
}
return ret;
}
+
+#ifdef CONFIG_ACPI
+int __init gicv2m_acpi_init(struct acpi_table_header *table,
+ struct irq_domain *parent)
+{
+ int ret = 0;
+ int num, i;
+ struct acpi_madt_generic_msi_frame *cur, *msi_frame;
+
+ ret = acpi_madt_msi_frame_init(table);
+ if (ret)
+ return ret;
+
+ ret = acpi_get_msi_frame(0, &msi_frame);
+ if (ret)
+ return ret;
+
+ num = acpi_get_num_msi_frames();
+
+ for (i = 0, cur = msi_frame; i < num; i++, cur++) {
+ struct resource res;
+ u32 spi_start = 0, nr_spis = 0;
+
+ res.start = cur->base_address;
+ res.end = cur->base_address + 0x1000;
+
+ if (cur->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) {
+ spi_start = cur->spi_base;
+ nr_spis = cur->spi_count;
+
+ pr_info("ACPI overriding V2M MSI_TYPER (base:%u, num:%u)\n",
+ spi_start, nr_spis);
+ }
+
+ ret = gicv2m_init_one(parent, &spi_start, &nr_spis, &res,
+ NULL, msi_frame);
+ if (ret)
+ break;
+
+ pr_info("MSI frame ID %u: range[%#lx:%#lx], SPI[%d:%d]\n",
+ cur->msi_frame_id,
+ (unsigned long)res.start, (unsigned long)res.end,
+ spi_start, (spi_start + nr_spis));
+ }
+ return ret;
+}
+
+#endif /* CONFIG_ACPI */
diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 8ac8ec4..5630e16 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1195,6 +1195,9 @@ gic_v2_acpi_init(struct acpi_table_header *table)
gic_init_bases(0, -1, dist_base, cpu_base, 0, NULL);
set_acpi_irq_domain(gic_data[0].domain);
+ if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
+ gicv2m_acpi_init(table, gic_data[0].domain);
+
acpi_irq_model = ACPI_IRQ_MODEL_GIC;
return 0;
}
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index 4808514..de1bd1e 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -118,6 +118,19 @@ static inline void gic_init(unsigned int nr, int start,
gic_init_bases(nr, start, dist, cpu, 0, NULL);
}
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+
+int gicv2m_acpi_init(struct acpi_table_header *table,
+ struct irq_domain *parent);
+#else
+int gicv2m_acpi_init(struct acpi_table_header *table,
+ struct irq_domain *parent);
+{
+ return 0;
+}
+#endif
+
int gicv2m_of_init(struct device_node *node, struct irq_domain *parent);
void gic_send_sgi(unsigned int cpu_id, unsigned int irq);
--
2.1.0
--
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