[Patch Part1 v8 27/37] x86/irq: Simplify MSI/DMAR/HPET implementation by using common code

Jiang Liu
2015-04-13T06:11:49Z

Use common MSI interfaces to simplify DMAR/HPET driver implementation.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1416894816-23245-28-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/apic/msi.c | 192 +++++++++++++-------------------------------
1 file changed, 54 insertions(+), 138 deletions(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index f5b899514634..da163da5fdee 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -62,10 +62,8 @@ static struct irq_chip pci_msi_controller = {
.irq_unmask = pci_msi_unmask_irq,
.irq_mask = pci_msi_mask_irq,
.irq_ack = irq_chip_ack_parent,
- .irq_set_affinity = msi_domain_set_affinity,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.irq_compose_msi_msg = irq_msi_compose_msg,
- .irq_write_msi_msg = pci_msi_domain_write_msg,
.flags = IRQCHIP_SKIP_SET_WAKE,
};

@@ -153,9 +151,7 @@ static struct irq_chip pci_msi_ir_controller = {
.irq_unmask = pci_msi_unmask_irq,
.irq_mask = pci_msi_mask_irq,
.irq_ack = irq_chip_ack_parent,
- .irq_set_affinity = msi_domain_set_affinity,
.irq_retrigger = irq_chip_retrigger_hierarchy,
- .irq_write_msi_msg = pci_msi_domain_write_msg,
.flags = IRQCHIP_SKIP_SET_WAKE,
};

@@ -175,23 +171,6 @@ struct irq_domain *arch_create_msi_irq_domain(struct irq_domain *parent)
#endif

#ifdef CONFIG_DMAR_TABLE
-static int
-dmar_msi_set_affinity(struct irq_data *data, const struct cpumask *mask,
- bool force)
-{
- struct irq_data *parent = data->parent_data;
- struct msi_msg msg;
- int ret;
-
- ret = parent->chip->irq_set_affinity(parent, mask, force);
- if (ret >= 0) {
- irq_chip_compose_msi_msg(data, &msg);
- dmar_msi_write(data->irq, &msg);
- }
-
- return ret;
-}
-
static void dmar_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
{
dmar_msi_write(data->irq, msg);
@@ -202,67 +181,37 @@ static struct irq_chip dmar_msi_controller = {
.irq_unmask = dmar_msi_unmask,
.irq_mask = dmar_msi_mask,
.irq_ack = irq_chip_ack_parent,
- .irq_set_affinity = dmar_msi_set_affinity,
+ .irq_set_affinity = msi_domain_set_affinity,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.irq_compose_msi_msg = irq_msi_compose_msg,
.irq_write_msi_msg = dmar_msi_write_msg,
.flags = IRQCHIP_SKIP_SET_WAKE,
};

-static int dmar_domain_alloc(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs, void *arg)
+static irq_hw_number_t dmar_msi_get_hwirq(struct msi_domain_info *info,
+ msi_alloc_info_t *arg)
{
- struct irq_alloc_info *info = arg;
- int ret;
-
- if (nr_irqs > 1 || !info || info->type != X86_IRQ_ALLOC_TYPE_DMAR)
- return -EINVAL;
- if (irq_find_mapping(domain, info->dmar_id)) {
- pr_warn("IRQ for DMAR%d already exists.\n", info->dmar_id);
- return -EEXIST;
- }
-
- ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
- if (ret >= 0) {
- irq_domain_set_hwirq_and_chip(domain, virq, info->dmar_id,
- &dmar_msi_controller, NULL);
- irq_set_handler_data(virq, info->dmar_data);
- __irq_set_handler(virq, handle_edge_irq, 0, "edge");
- }
-
- return ret;
+ return arg->dmar_id;
}

-static void dmar_domain_free(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs)
+static int dmar_msi_init(struct irq_domain *domain,
+ struct msi_domain_info *info, unsigned int virq,
+ irq_hw_number_t hwirq, msi_alloc_info_t *arg)
{
- BUG_ON(nr_irqs > 1);
- irq_domain_free_irqs_top(domain, virq, nr_irqs);
-}
+ irq_domain_set_info(domain, virq, arg->dmar_id, info->chip, NULL,
+ handle_edge_irq, arg->dmar_data, "edge");

-static void dmar_domain_activate(struct irq_domain *domain,
- struct irq_data *irq_data)
-{
- struct msi_msg msg;
-
- BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
- dmar_msi_write(irq_data->irq, &msg);
+ return 0;
}

-static void dmar_domain_deactivate(struct irq_domain *domain,
- struct irq_data *irq_data)
-{
- struct msi_msg msg;
-
- memset(&msg, 0, sizeof(msg));
- dmar_msi_write(irq_data->irq, &msg);
-}
+static struct msi_domain_ops dmar_msi_domain_ops = {
+ .get_hwirq = dmar_msi_get_hwirq,
+ .msi_init = dmar_msi_init,
+};

-static struct irq_domain_ops dmar_domain_ops = {
- .alloc = dmar_domain_alloc,
- .free = dmar_domain_free,
- .activate = dmar_domain_activate,
- .deactivate = dmar_domain_deactivate,
+static struct msi_domain_info dmar_msi_domain_info = {
+ .ops = &dmar_msi_domain_ops,
+ .chip = &dmar_msi_controller,
};

static struct irq_domain *dmar_get_irq_domain(void)
@@ -271,11 +220,9 @@ static struct irq_domain *dmar_get_irq_domain(void)
static DEFINE_MUTEX(dmar_lock);

mutex_lock(&dmar_lock);
- if (dmar_domain == NULL) {
- dmar_domain = irq_domain_add_tree(NULL, &dmar_domain_ops, NULL);
- if (dmar_domain)
- dmar_domain->parent = x86_vector_domain;
- }
+ if (dmar_domain == NULL)
+ dmar_domain = msi_create_irq_domain(NULL, &dmar_msi_domain_info,
+ x86_vector_domain);
mutex_unlock(&dmar_lock);

return dmar_domain;
@@ -309,23 +256,9 @@ void dmar_free_hwirq(int irq)
#ifdef CONFIG_HPET_TIMER
static inline int hpet_dev_id(struct irq_domain *domain)
{
- return (int)(long)domain->host_data;
-}
+ struct msi_domain_info *info = msi_get_domain_info(domain);

-static int hpet_msi_set_affinity(struct irq_data *data,
- const struct cpumask *mask, bool force)
-{
- struct irq_data *parent = data->parent_data;
- struct msi_msg msg;
- int ret;
-
- ret = parent->chip->irq_set_affinity(parent, mask, force);
- if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
- irq_chip_compose_msi_msg(data, &msg);
- hpet_msi_write(data->handler_data, &msg);
- }
-
- return ret;
+ return (int)(long)info->data;
}

static void hpet_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
@@ -338,79 +271,63 @@ static struct irq_chip hpet_msi_controller = {
.irq_unmask = hpet_msi_unmask,
.irq_mask = hpet_msi_mask,
.irq_ack = irq_chip_ack_parent,
- .irq_set_affinity = hpet_msi_set_affinity,
+ .irq_set_affinity = msi_domain_set_affinity,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.irq_compose_msi_msg = irq_msi_compose_msg,
.irq_write_msi_msg = hpet_msi_write_msg,
.flags = IRQCHIP_SKIP_SET_WAKE,
};

-static int hpet_domain_alloc(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs, void *arg)
-{
- struct irq_alloc_info *info = arg;
- int ret;
-
- if (nr_irqs > 1 || !info || info->type != X86_IRQ_ALLOC_TYPE_HPET)
- return -EINVAL;
- if (irq_find_mapping(domain, info->hpet_index)) {
- pr_warn("IRQ for HPET%d already exists.\n", info->hpet_index);
- return -EEXIST;
- }
-
- ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
- if (ret >= 0) {
- irq_set_status_flags(virq, IRQ_MOVE_PCNTXT);
- irq_domain_set_hwirq_and_chip(domain, virq, info->hpet_index,
- &hpet_msi_controller, NULL);
- irq_set_handler_data(virq, info->hpet_data);
- __irq_set_handler(virq, handle_edge_irq, 0, "edge");
- }
-
- return ret;
-}
-
-static void hpet_domain_free(struct irq_domain *domain, unsigned int virq,
- unsigned int nr_irqs)
+static irq_hw_number_t hpet_msi_get_hwirq(struct msi_domain_info *info,
+ msi_alloc_info_t *arg)
{
- BUG_ON(nr_irqs > 1);
- irq_clear_status_flags(virq, IRQ_MOVE_PCNTXT);
- irq_domain_free_irqs_top(domain, virq, nr_irqs);
+ return arg->hpet_index;
}

-static void hpet_domain_activate(struct irq_domain *domain,
- struct irq_data *irq_data)
+static int hpet_msi_init(struct irq_domain *domain,
+ struct msi_domain_info *info, unsigned int virq,
+ irq_hw_number_t hwirq, msi_alloc_info_t *arg)
{
- struct msi_msg msg;
+ irq_set_status_flags(virq, IRQ_MOVE_PCNTXT);
+ irq_domain_set_info(domain, virq, arg->hpet_index, info->chip, NULL,
+ handle_edge_irq, arg->hpet_data, "edge");

- BUG_ON(irq_chip_compose_msi_msg(irq_data, &msg));
- hpet_msi_write(irq_get_handler_data(irq_data->irq), &msg);
+ return 0;
}

-static void hpet_domain_deactivate(struct irq_domain *domain,
- struct irq_data *irq_data)
+static void hpet_msi_free(struct irq_domain *domain,
+ struct msi_domain_info *info, unsigned int virq)
{
- struct msi_msg msg;
-
- memset(&msg, 0, sizeof(msg));
- hpet_msi_write(irq_get_handler_data(irq_data->irq), &msg);
+ irq_clear_status_flags(virq, IRQ_MOVE_PCNTXT);
}

-static struct irq_domain_ops hpet_domain_ops = {
- .alloc = hpet_domain_alloc,
- .free = hpet_domain_free,
- .activate = hpet_domain_activate,
- .deactivate = hpet_domain_deactivate,
+static struct msi_domain_ops hpet_msi_domain_ops = {
+ .get_hwirq = hpet_msi_get_hwirq,
+ .msi_init = hpet_msi_init,
+ .msi_free = hpet_msi_free,
+};
+
+static struct msi_domain_info hpet_msi_domain_info = {
+ .ops = &hpet_msi_domain_ops,
+ .chip = &hpet_msi_controller,
};

struct irq_domain *hpet_create_irq_domain(int hpet_id)
{
struct irq_domain *parent;
struct irq_alloc_info info;
+ struct msi_domain_info *domain_info;

if (x86_vector_domain == NULL)
return NULL;

+ domain_info = kzalloc(sizeof(*domain_info), GFP_KERNEL);
+ if (!domain_info)
+ return NULL;
+
+ *domain_info = hpet_msi_domain_info;
+ domain_info->data = (void *)(long)hpet_id;
+
init_irq_alloc_info(&info, NULL);
info.type = X86_IRQ_ALLOC_TYPE_HPET;
info.hpet_id = hpet_id;
@@ -420,8 +337,7 @@ struct irq_domain *hpet_create_irq_domain(int hpet_id)
else
hpet_msi_controller.name = "IR-HPET-MSI";

- return irq_domain_add_hierarchy(parent, 0, 0, NULL, &hpet_domain_ops,
- (void *)(long)hpet_id);
+ return msi_create_irq_domain(NULL, domain_info, parent);
}

int hpet_assign_irq(struct irq_domain *domain, struct hpet_dev *dev,
--
1.7.10.4