[PATCH v3 03/13] irqchip: GICv3: rework redistributor structure
Marc Zyngier
marc.zyngier at arm.com
Mon Nov 24 06:35:10 PST 2014
The basic GICv3 driver has almost no use for the redistributor
(other than the basic per-CPU interrupts), but the ITS needs
a lot more from them.
As such, rework the set of data structures. The behaviour of the
GICv3 driver is otherwise unaffected.
Signed-off-by: Marc Zyngier <marc.zyngier at arm.com>
---
drivers/irqchip/irq-gic-v3.c | 73 +++++++++++++++++++++++---------------
include/linux/irqchip/arm-gic-v3.h | 15 ++++++++
2 files changed, 59 insertions(+), 29 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 4cb355a..43e57da 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -34,20 +34,25 @@
#include "irq-gic-common.h"
#include "irqchip.h"
+struct redist_region {
+ void __iomem *redist_base;
+ phys_addr_t phys_base;
+};
+
struct gic_chip_data {
void __iomem *dist_base;
- void __iomem **redist_base;
- void __iomem * __percpu *rdist;
+ struct redist_region *redist_regions;
+ struct rdists rdists;
struct irq_domain *domain;
u64 redist_stride;
- u32 redist_regions;
+ u32 nr_redist_regions;
unsigned int irq_nr;
};
static struct gic_chip_data gic_data __read_mostly;
-#define gic_data_rdist() (this_cpu_ptr(gic_data.rdist))
-#define gic_data_rdist_rd_base() (*gic_data_rdist())
+#define gic_data_rdist() (this_cpu_ptr(gic_data.rdists.rdist))
+#define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
#define gic_data_rdist_sgi_base() (gic_data_rdist_rd_base() + SZ_64K)
/* Our default, arbitrary priority value. Linux only uses one anyway. */
@@ -333,8 +338,8 @@ static int gic_populate_rdist(void)
MPIDR_AFFINITY_LEVEL(mpidr, 1) << 8 |
MPIDR_AFFINITY_LEVEL(mpidr, 0));
- for (i = 0; i < gic_data.redist_regions; i++) {
- void __iomem *ptr = gic_data.redist_base[i];
+ for (i = 0; i < gic_data.nr_redist_regions; i++) {
+ void __iomem *ptr = gic_data.redist_regions[i].redist_base;
u32 reg;
reg = readl_relaxed(ptr + GICR_PIDR2) & GIC_PIDR2_ARCH_MASK;
@@ -347,10 +352,13 @@ static int gic_populate_rdist(void)
do {
typer = readq_relaxed(ptr + GICR_TYPER);
if ((typer >> 32) == aff) {
+ u64 offset = ptr - gic_data.redist_regions[i].redist_base;
gic_data_rdist_rd_base() = ptr;
- pr_info("CPU%d: found redistributor %llx @%p\n",
+ gic_data_rdist()->phys_base = gic_data.redist_regions[i].phys_base + offset;
+ pr_info("CPU%d: found redistributor %llx region %d:%pa\n",
smp_processor_id(),
- (unsigned long long)mpidr, ptr);
+ (unsigned long long)mpidr,
+ i, &gic_data_rdist()->phys_base);
return 0;
}
@@ -673,9 +681,10 @@ static const struct irq_domain_ops gic_irq_domain_ops = {
static int __init gic_of_init(struct device_node *node, struct device_node *parent)
{
void __iomem *dist_base;
- void __iomem **redist_base;
+ struct redist_region *rdist_regs;
u64 redist_stride;
- u32 redist_regions;
+ u32 nr_redist_regions;
+ u32 typer;
u32 reg;
int gic_irqs;
int err;
@@ -696,48 +705,54 @@ static int __init gic_of_init(struct device_node *node, struct device_node *pare
goto out_unmap_dist;
}
- if (of_property_read_u32(node, "#redistributor-regions", &redist_regions))
- redist_regions = 1;
+ if (of_property_read_u32(node, "#redistributor-regions", &nr_redist_regions))
+ nr_redist_regions = 1;
- redist_base = kzalloc(sizeof(*redist_base) * redist_regions, GFP_KERNEL);
- if (!redist_base) {
+ rdist_regs = kzalloc(sizeof(*rdist_regs) * nr_redist_regions, GFP_KERNEL);
+ if (!rdist_regs) {
err = -ENOMEM;
goto out_unmap_dist;
}
- for (i = 0; i < redist_regions; i++) {
- redist_base[i] = of_iomap(node, 1 + i);
- if (!redist_base[i]) {
+ for (i = 0; i < nr_redist_regions; i++) {
+ struct resource res;
+ int ret;
+
+ ret = of_address_to_resource(node, 1 + i, &res);
+ rdist_regs[i].redist_base = of_iomap(node, 1 + i);
+ if (ret || !rdist_regs[i].redist_base) {
pr_err("%s: couldn't map region %d\n",
node->full_name, i);
err = -ENODEV;
goto out_unmap_rdist;
}
+ rdist_regs[i].phys_base = res.start;
}
if (of_property_read_u64(node, "redistributor-stride", &redist_stride))
redist_stride = 0;
gic_data.dist_base = dist_base;
- gic_data.redist_base = redist_base;
- gic_data.redist_regions = redist_regions;
+ gic_data.redist_regions = rdist_regs;
+ gic_data.nr_redist_regions = nr_redist_regions;
gic_data.redist_stride = redist_stride;
/*
* Find out how many interrupts are supported.
* The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI)
*/
- gic_irqs = readl_relaxed(gic_data.dist_base + GICD_TYPER) & 0x1f;
- gic_irqs = (gic_irqs + 1) * 32;
+ typer = readl_relaxed(gic_data.dist_base + GICD_TYPER);
+ gic_data.rdists.id_bits = GICD_TYPER_ID_BITS(typer);
+ gic_irqs = GICD_TYPER_IRQS(typer);
if (gic_irqs > 1020)
gic_irqs = 1020;
gic_data.irq_nr = gic_irqs;
gic_data.domain = irq_domain_add_tree(node, &gic_irq_domain_ops,
&gic_data);
- gic_data.rdist = alloc_percpu(typeof(*gic_data.rdist));
+ gic_data.rdists.rdist = alloc_percpu(typeof(*gic_data.rdists.rdist));
- if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdist)) {
+ if (WARN_ON(!gic_data.domain) || WARN_ON(!gic_data.rdists.rdist)) {
err = -ENOMEM;
goto out_free;
}
@@ -754,12 +769,12 @@ static int __init gic_of_init(struct device_node *node, struct device_node *pare
out_free:
if (gic_data.domain)
irq_domain_remove(gic_data.domain);
- free_percpu(gic_data.rdist);
+ free_percpu(gic_data.rdists.rdist);
out_unmap_rdist:
- for (i = 0; i < redist_regions; i++)
- if (redist_base[i])
- iounmap(redist_base[i]);
- kfree(redist_base);
+ for (i = 0; i < nr_redist_regions; i++)
+ if (rdist_regs[i].redist_base)
+ iounmap(rdist_regs[i].redist_base);
+ kfree(rdist_regs);
out_unmap_dist:
iounmap(dist_base);
return err;
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index 03a4ea3..040615a 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -49,6 +49,10 @@
#define GICD_CTLR_ENABLE_G1A (1U << 1)
#define GICD_CTLR_ENABLE_G1 (1U << 0)
+#define GICD_TYPER_ID_BITS(typer) ((((typer) >> 19) & 0x1f) + 1)
+#define GICD_TYPER_IRQS(typer) ((((typer) & 0x1f) + 1) * 32)
+#define GICD_TYPER_LPIS (1U << 17)
+
#define GICD_IROUTER_SPI_MODE_ONE (0U << 31)
#define GICD_IROUTER_SPI_MODE_ANY (1U << 31)
@@ -189,6 +193,17 @@
#include <linux/stringify.h>
+struct rdists {
+ struct {
+ void __iomem *rd_base;
+ struct page *pend_page;
+ phys_addr_t phys_base;
+ } __percpu *rdist;
+ struct page *prop_page;
+ int id_bits;
+ u64 flags;
+};
+
static inline void gic_write_eoir(u64 irq)
{
asm volatile("msr_s " __stringify(ICC_EOIR1_EL1) ", %0" : : "r" (irq));
--
2.1.3
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