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Subject[tip:irq/core] irqchip/mips-gic: Remove device IRQ domain
Commit-ID:  b87281e7f205eda08c911fdacd27d4d2f01daa09
Gitweb: http://git.kernel.org/tip/b87281e7f205eda08c911fdacd27d4d2f01daa09
Author: Paul Burton <paul.burton@imgtec.com>
AuthorDate: Thu, 20 Apr 2017 10:07:35 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 20 Apr 2017 16:07:02 +0200

irqchip/mips-gic: Remove device IRQ domain

In commit c98c1822ee13 ("irqchip/mips-gic: Add device hierarchy domain")
Qais indicates that he felt having a separate device IRQ domain was
cleaner, but along with everyone else I'm aware of touching this driver
I disagree.

Remove the separate device IRQ domain so that we simply have the main
GIC IRQ domain used for devices, and an IPI IRQ domain as a child. The
logic for handling the device interrupts & IPIs is cleanly separated
into the appropriate domain ops, making it much easier to reason about
what the driver is doing than the previous approach where the 2 child
domains had to call up to their parent, which had to handle both types
of interrupt & had all sorts of weird & wonderful duplication or
outright clobbering of setup performed by multiple domains.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Link: http://lkml.kernel.org/r/1492679256-14513-3-git-send-email-matt.redfearn@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
drivers/irqchip/irq-mips-gic.c | 290 +++++++++++++----------------------------
1 file changed, 93 insertions(+), 197 deletions(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index db058e1..eb448a1 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -29,25 +29,12 @@ struct gic_pcpu_mask {
DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
};

-struct gic_irq_spec {
- enum {
- GIC_DEVICE,
- GIC_IPI
- } type;
-
- union {
- struct cpumask *ipimask;
- unsigned int hwirq;
- };
-};
-
static unsigned long __gic_base_addr;

static void __iomem *gic_base;
static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
static DEFINE_SPINLOCK(gic_lock);
static struct irq_domain *gic_irq_domain;
-static struct irq_domain *gic_dev_domain;
static struct irq_domain *gic_ipi_domain;
static int gic_shared_intrs;
static int gic_vpes;
@@ -694,132 +681,7 @@ static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
return 0;
}

-static int gic_setup_dev_chip(struct irq_domain *d, unsigned int virq,
- unsigned int hwirq)
-{
- struct irq_chip *chip;
- int err;
-
- if (hwirq >= GIC_SHARED_HWIRQ_BASE) {
- err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
- &gic_level_irq_controller,
- NULL);
- } else {
- switch (GIC_HWIRQ_TO_LOCAL(hwirq)) {
- case GIC_LOCAL_INT_TIMER:
- case GIC_LOCAL_INT_PERFCTR:
- case GIC_LOCAL_INT_FDC:
- /*
- * HACK: These are all really percpu interrupts, but
- * the rest of the MIPS kernel code does not use the
- * percpu IRQ API for them.
- */
- chip = &gic_all_vpes_local_irq_controller;
- irq_set_handler(virq, handle_percpu_irq);
- break;
-
- default:
- chip = &gic_local_irq_controller;
- irq_set_handler(virq, handle_percpu_devid_irq);
- irq_set_percpu_devid(virq);
- break;
- }
-
- err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
- chip, NULL);
- }
-
- return err;
-}
-
-static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
- unsigned int nr_irqs, void *arg)
-{
- struct gic_irq_spec *spec = arg;
- irq_hw_number_t hwirq, base_hwirq;
- int cpu, ret, i;
-
- if (spec->type == GIC_DEVICE) {
- /* verify that shared irqs don't conflict with an IPI irq */
- if ((spec->hwirq >= GIC_SHARED_HWIRQ_BASE) &&
- test_bit(GIC_HWIRQ_TO_SHARED(spec->hwirq), ipi_resrv))
- return -EBUSY;
-
- return gic_setup_dev_chip(d, virq, spec->hwirq);
- } else {
- base_hwirq = find_first_bit(ipi_available, gic_shared_intrs);
- if (base_hwirq == gic_shared_intrs) {
- return -ENOMEM;
- }
-
- /* check that we have enough space */
- for (i = base_hwirq; i < nr_irqs; i++) {
- if (!test_bit(i, ipi_available))
- return -EBUSY;
- }
- bitmap_clear(ipi_available, base_hwirq, nr_irqs);
-
- /* map the hwirq for each cpu consecutively */
- i = 0;
- for_each_cpu(cpu, spec->ipimask) {
- hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i);
-
- ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq,
- &gic_level_irq_controller,
- NULL);
- if (ret)
- goto error;
-
- irq_set_handler(virq + i, handle_level_irq);
-
- ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu);
- if (ret)
- goto error;
-
- i++;
- }
-
- /*
- * tell the parent about the base hwirq we allocated so it can
- * set its own domain data
- */
- spec->hwirq = base_hwirq;
- }
-
- return 0;
-error:
- bitmap_set(ipi_available, base_hwirq, nr_irqs);
- return ret;
-}
-
-void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
- unsigned int nr_irqs)
-{
- irq_hw_number_t base_hwirq;
- struct irq_data *data;
-
- data = irq_get_irq_data(virq);
- if (!data)
- return;
-
- base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data));
- bitmap_set(ipi_available, base_hwirq, nr_irqs);
-}
-
-int gic_irq_domain_match(struct irq_domain *d, struct device_node *node,
- enum irq_domain_bus_token bus_token)
-{
- /* this domain should'nt be accessed directly */
- return 0;
-}
-
-static const struct irq_domain_ops gic_irq_domain_ops = {
- .alloc = gic_irq_domain_alloc,
- .free = gic_irq_domain_free,
- .match = gic_irq_domain_match,
-};
-
-static int gic_dev_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
+static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq,
unsigned int *out_type)
@@ -838,58 +700,73 @@ static int gic_dev_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
return 0;
}

-static int gic_dev_domain_alloc(struct irq_domain *d, unsigned int virq,
+static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct irq_fwspec *fwspec = arg;
- struct gic_irq_spec spec = {
- .type = GIC_DEVICE,
- };
- int i, ret;
+ irq_hw_number_t hwirq;
+ int err;

- if (fwspec->param[0] == GIC_SHARED)
- spec.hwirq = GIC_SHARED_TO_HWIRQ(fwspec->param[1]);
- else
- spec.hwirq = GIC_LOCAL_TO_HWIRQ(fwspec->param[1]);
+ if (fwspec->param[0] == GIC_SHARED) {
+ hwirq = GIC_SHARED_TO_HWIRQ(fwspec->param[1]);

- ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec);
- if (ret)
- return ret;
+ /* verify that shared irqs don't conflict with an IPI irq */
+ if (test_bit(GIC_HWIRQ_TO_SHARED(hwirq), ipi_resrv))
+ return -EBUSY;

- for (i = 0; i < nr_irqs; i++) {
- ret = gic_setup_dev_chip(d, virq + i, spec.hwirq + i);
- if (ret)
- goto error;
+ err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
+ &gic_level_irq_controller,
+ NULL);
+ if (err)
+ return err;
+
+ return gic_shared_irq_domain_map(d, virq, hwirq, 0);
}

- return 0;
+ hwirq = GIC_LOCAL_TO_HWIRQ(fwspec->param[1]);

-error:
- irq_domain_free_irqs_parent(d, virq, nr_irqs);
- return ret;
-}
+ switch (GIC_HWIRQ_TO_LOCAL(hwirq)) {
+ case GIC_LOCAL_INT_TIMER:
+ case GIC_LOCAL_INT_PERFCTR:
+ case GIC_LOCAL_INT_FDC:
+ /*
+ * HACK: These are all really percpu interrupts, but
+ * the rest of the MIPS kernel code does not use the
+ * percpu IRQ API for them.
+ */
+ err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
+ &gic_all_vpes_local_irq_controller,
+ NULL);
+ if (err)
+ return err;

-void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
- unsigned int nr_irqs)
-{
- /* no real allocation is done for dev irqs, so no need to free anything */
- return;
+ irq_set_handler(virq, handle_percpu_irq);
+ break;
+
+ default:
+ err = irq_domain_set_hwirq_and_chip(d, virq, hwirq,
+ &gic_local_irq_controller,
+ NULL);
+ if (err)
+ return err;
+
+ irq_set_handler(virq, handle_percpu_devid_irq);
+ irq_set_percpu_devid(virq);
+ break;
+ }
+
+ return gic_local_irq_domain_map(d, virq, hwirq);
}

-static void gic_dev_domain_activate(struct irq_domain *domain,
- struct irq_data *d)
+void gic_irq_domain_free(struct irq_domain *d, unsigned int virq,
+ unsigned int nr_irqs)
{
- if (GIC_HWIRQ_TO_LOCAL(d->hwirq) < GIC_NUM_LOCAL_INTRS)
- gic_local_irq_domain_map(domain, d->irq, d->hwirq);
- else
- gic_shared_irq_domain_map(domain, d->irq, d->hwirq, 0);
}

-static struct irq_domain_ops gic_dev_domain_ops = {
- .xlate = gic_dev_domain_xlate,
- .alloc = gic_dev_domain_alloc,
- .free = gic_dev_domain_free,
- .activate = gic_dev_domain_activate,
+static const struct irq_domain_ops gic_irq_domain_ops = {
+ .xlate = gic_irq_domain_xlate,
+ .alloc = gic_irq_domain_alloc,
+ .free = gic_irq_domain_free,
};

static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr,
@@ -911,20 +788,32 @@ static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct cpumask *ipimask = arg;
- struct gic_irq_spec spec = {
- .type = GIC_IPI,
- .ipimask = ipimask
- };
- int ret, i;
+ irq_hw_number_t hwirq, base_hwirq;
+ int cpu, ret, i;
+
+ base_hwirq = find_first_bit(ipi_available, gic_shared_intrs);
+ if (base_hwirq == gic_shared_intrs)
+ return -ENOMEM;

- ret = irq_domain_alloc_irqs_parent(d, virq, nr_irqs, &spec);
- if (ret)
- return ret;
+ /* check that we have enough space */
+ for (i = base_hwirq; i < nr_irqs; i++) {
+ if (!test_bit(i, ipi_available))
+ return -EBUSY;
+ }
+ bitmap_clear(ipi_available, base_hwirq, nr_irqs);
+
+ /* map the hwirq for each cpu consecutively */
+ i = 0;
+ for_each_cpu(cpu, ipimask) {
+ hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i);
+
+ ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq,
+ &gic_edge_irq_controller,
+ NULL);
+ if (ret)
+ goto error;

- /* the parent should have set spec.hwirq to the base_hwirq it allocated */
- for (i = 0; i < nr_irqs; i++) {
- ret = irq_domain_set_hwirq_and_chip(d, virq + i,
- GIC_SHARED_TO_HWIRQ(spec.hwirq + i),
+ ret = irq_domain_set_hwirq_and_chip(d->parent, virq + i, hwirq,
&gic_edge_irq_controller,
NULL);
if (ret)
@@ -933,18 +822,32 @@ static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq,
ret = irq_set_irq_type(virq + i, IRQ_TYPE_EDGE_RISING);
if (ret)
goto error;
+
+ ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu);
+ if (ret)
+ goto error;
+
+ i++;
}

return 0;
error:
- irq_domain_free_irqs_parent(d, virq, nr_irqs);
+ bitmap_set(ipi_available, base_hwirq, nr_irqs);
return ret;
}

void gic_ipi_domain_free(struct irq_domain *d, unsigned int virq,
unsigned int nr_irqs)
{
- irq_domain_free_irqs_parent(d, virq, nr_irqs);
+ irq_hw_number_t base_hwirq;
+ struct irq_data *data;
+
+ data = irq_get_irq_data(virq);
+ if (!data)
+ return;
+
+ base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data));
+ bitmap_set(ipi_available, base_hwirq, nr_irqs);
}

int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node,
@@ -1072,13 +975,6 @@ static void __init __gic_init(unsigned long gic_base_addr,
panic("Failed to add GIC IRQ domain");
gic_irq_domain->name = "mips-gic-irq";

- gic_dev_domain = irq_domain_add_hierarchy(gic_irq_domain, 0,
- GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
- node, &gic_dev_domain_ops, NULL);
- if (!gic_dev_domain)
- panic("Failed to add GIC DEV domain");
- gic_dev_domain->name = "mips-gic-dev";
-
gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain,
IRQ_DOMAIN_FLAG_IPI_PER_CPU,
GIC_NUM_LOCAL_INTRS + gic_shared_intrs,
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