Re: [PATCH v4 10/10] irqchip / gicv2m: Introducing gicv2m_acpi_init()
From: Suravee Suthikulpanit
Date: Sun Aug 09 2015 - 04:05:07 EST
Hi Marc,
On 8/4/15 21:23, Marc Zyngier wrote:
On 29/07/15 11:08, Hanjun Guo wrote:
From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
This patch introduces gicv2m_acpi_init(), which uses information
in MADT GIC MSI frames structure to initialize GICv2m driver.
It also refactors gicv2m_init_one() to handle both DT and ACPI
initialization path.
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
---
drivers/irqchip/irq-gic-v2m.c | 111 +++++++++++++++++++++++++++++++---------
drivers/irqchip/irq-gic.c | 3 ++
include/linux/irqchip/arm-gic.h | 7 +++
3 files changed, 98 insertions(+), 23 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index d0fcbf8..c491a08 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>
@@ -211,6 +212,10 @@ static bool is_msi_spi_valid(u32 base, u32 num)
return true;
}
+char gicv2m_domain_name[] = "GICV2M";
+char gicv2m_pci_msi_domain_name[] = "GICV2M-PCI-MSI";
+char gicv2m_plat_msi_domain_name[] = "GICV2M-PLAT-MSI";
+
Can't these be static? Why do we need them?
Of course, this is not needed. I figured it was useful when I was
debugging the irq domain hierarchy stuff. I'll remove it then.
[...]
@@ -329,15 +330,79 @@ 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,
If these spi_start and nr_spis pointers passed to gicv2m_init_one are
only for the benefit of printing the message below, just move the
message inside the function...
Ok.
+ child);
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 i, ret;
+
+ ret = acpi_gic_msi_init(table);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < acpi_gic_get_num_msi_frame(); i++) {
+ struct resource res;
+ u32 spi_start = 0, nr_spis = 0;
+ struct acpi_madt_generic_msi_frame *m;
+
+ ret = acpi_gic_get_msi_frame(i, &m);
+ if (ret)
+ return ret;
+
All of that should be moved here. And we don't need to build an
intermediate representation. Just build the v2m_data structures as you go.
I'll rework the ACPI MADT parsing, and move it into this file, and get
rid of the structure.
+ res.start = m->base_address;
+ res.end = m->base_address + 0x1000;
+
+ if (m->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) {
+ spi_start = m->spi_base;
+ nr_spis = m->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,
+ (void *)(m->base_address));
+ if (ret)
+ break;
+
+ pr_info("MSI frame ID %u: range[%#lx:%#lx], SPI[%d:%d]\n",
+ m->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 bec6b00..531ebbc 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -1159,6 +1159,9 @@ gic_v2_acpi_init(struct acpi_table_header *table)
*/
gic_init_bases(0, -1, dist_base, cpu_base, 0, (void *)ACPI_IRQ_MODEL_GIC);
+ if (IS_ENABLED(CONFIG_ARM_GIC_V2M))
+ gicv2m_acpi_init(table, gic_data[0].domain);
+
acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, ACPI_IRQ_MODEL_GIC,
gic_acpi_gsi_desc_populate);
return 0;
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index 97799b7..27d8196 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -109,6 +109,13 @@ static inline void gic_init(unsigned int nr, int start,
int gicv2m_of_init(struct device_node *node, struct irq_domain *parent);
+#ifdef CONFIG_ACPI
+struct acpi_table_header;
+
+int gicv2m_acpi_init(struct acpi_table_header *table,
+ struct irq_domain *parent);
+#endif
+
void gic_send_sgi(unsigned int cpu_id, unsigned int irq);
int gic_get_cpu_id(unsigned int cpu);
void gic_migrate_target(unsigned int new_cpu_id);
This needs rework to do the parsing of the tables in this driver. Just
expose the domain_token through a function that you register with the
ACPI layer.
Ok. I'll investigate and rework this to only expose the domain_token.
Basically, I would need a way to pass down a device from ACPI layer into
irqchips (e.g. GICv2m and GICv3-ITS), so that it can verify the device
with the MSI domains and return the appropriate domain token (or some
sort of domain reference).
Thanks,
Suravee
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