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Subject[PATCH v5 13/19] irqchip: gicv3-its: Get rid of struct msi_controller
Date
The GICv3 ITS only uses the msi_controller structure as a way
to match the host bridge with its MSI HW, and thus the msi_domain.
But now that we can directly associate an msi_domain with a device,
there is no use keeping this msi_controller around.

Just remove all traces of msi_controller from the driver.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
drivers/irqchip/irq-gic-v3-its.c | 38 ++++++++++++++++----------------------
1 file changed, 16 insertions(+), 22 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 760467d..ca8b1cc 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -54,13 +54,12 @@ struct its_collection {

/*
* The ITS structure - contains most of the infrastructure, with the
- * msi_controller, the command queue, the collections, and the list of
- * devices writing to it.
+ * top-level MSI domain, the command queue, the collections, and the
+ * list of devices writing to it.
*/
struct its_node {
raw_spinlock_t lock;
struct list_head entry;
- struct msi_controller msi_chip;
struct irq_domain *domain;
void __iomem *base;
unsigned long phys_base;
@@ -776,7 +775,7 @@ static void its_free_tables(struct its_node *its)
}
}

-static int its_alloc_tables(struct its_node *its)
+static int its_alloc_tables(const char *node_name, struct its_node *its)
{
int err;
int i;
@@ -819,7 +818,7 @@ static int its_alloc_tables(struct its_node *its)
if (order >= MAX_ORDER) {
order = MAX_ORDER - 1;
pr_warn("%s: Device Table too large, reduce its page order to %u\n",
- its->msi_chip.of_node->full_name, order);
+ node_name, order);
}
}

@@ -889,7 +888,7 @@ retry_baser:

if (val != tmp) {
pr_err("ITS: %s: GITS_BASER%d doesn't stick: %lx %lx\n",
- its->msi_chip.of_node->full_name, i,
+ node_name, i,
(unsigned long) val, (unsigned long) tmp);
err = -ENXIO;
goto out_free;
@@ -1317,6 +1316,7 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
struct resource res;
struct its_node *its;
void __iomem *its_base;
+ struct irq_domain *inner_domain = NULL;
u32 val;
u64 baser, tmp;
int err;
@@ -1360,7 +1360,6 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
INIT_LIST_HEAD(&its->its_device_list);
its->base = its_base;
its->phys_base = res.start;
- its->msi_chip.of_node = node;
its->ite_size = ((readl_relaxed(its_base + GITS_TYPER) >> 4) & 0xf) + 1;

its->cmd_base = kzalloc(ITS_CMD_QUEUE_SZ, GFP_KERNEL);
@@ -1370,7 +1369,7 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
}
its->cmd_write = its->cmd_base;

- err = its_alloc_tables(its);
+ err = its_alloc_tables(node->full_name, its);
if (err)
goto out_free_cmd;

@@ -1406,26 +1405,21 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
writeq_relaxed(0, its->base + GITS_CWRITER);
writel_relaxed(GITS_CTLR_ENABLE, its->base + GITS_CTLR);

- if (of_property_read_bool(its->msi_chip.of_node, "msi-controller")) {
- its->domain = irq_domain_add_tree(node, &its_domain_ops, its);
- if (!its->domain) {
+ if (of_property_read_bool(node, "msi-controller")) {
+ inner_domain = irq_domain_add_tree(node, &its_domain_ops, its);
+ if (!inner_domain) {
err = -ENOMEM;
goto out_free_tables;
}

- its->domain->parent = parent;
- its->domain->bus_token = DOMAIN_BUS_NEXUS;
+ inner_domain->parent = parent;
+ inner_domain->bus_token = DOMAIN_BUS_NEXUS;

- its->msi_chip.domain = its_pci_msi_alloc_domain(node,
- its->domain);
- if (!its->msi_chip.domain) {
+ its->domain = its_pci_msi_alloc_domain(node, inner_domain);
+ if (!its->domain) {
err = -ENOMEM;
goto out_free_domains;
}
-
- err = of_pci_msi_chip_add(&its->msi_chip);
- if (err)
- goto out_free_domains;
}

spin_lock(&its_lock);
@@ -1435,10 +1429,10 @@ static int its_probe(struct device_node *node, struct irq_domain *parent)
return 0;

out_free_domains:
- if (its->msi_chip.domain)
- irq_domain_remove(its->msi_chip.domain);
if (its->domain)
irq_domain_remove(its->domain);
+ if (inner_domain)
+ irq_domain_remove(inner_domain);
out_free_tables:
its_free_tables(its);
out_free_cmd:
--
2.1.4


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