[Patch Part1 v8 06/37] x86/htirq: Use new irqdomain interfaces to allocate/free IRQ

Jiang Liu
2015-04-13T06:11:00Z

Use new irqdomain interfaces to allocate/free IRQ for HTIRQ, so we could
kill GENERIC_IRQ_LEGACY_ALLOC_HWIRQ later.

This patch changes the interfaces between arch independent PCI driver
and arch specific code. Currently HT_IRQ is only enabled on x86, so it
shouldn't break other architectures.

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/1416894816-23245-7-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/apic/htirq.c | 26 +++++++++++++-------------
drivers/pci/htirq.c | 7 +++----
include/linux/htirq.h | 2 ++
3 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kernel/apic/htirq.c b/arch/x86/kernel/apic/htirq.c
index 816f36e979ad..b307ee7a7148 100644
--- a/arch/x86/kernel/apic/htirq.c
+++ b/arch/x86/kernel/apic/htirq.c
@@ -14,6 +14,7 @@
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/htirq.h>
+#include <linux/irqdomain.h>
#include <asm/hw_irq.h>
#include <asm/apic.h>
#include <asm/hypertransport.h>
@@ -61,31 +62,30 @@ static struct irq_chip ht_irq_chip = {
.flags = IRQCHIP_SKIP_SET_WAKE,
};

+int arch_alloc_ht_irq(struct pci_dev *dev)
+{
+ return irq_domain_alloc_irqs(NULL, 1, dev_to_node(&dev->dev), NULL);
+}
+
+void arch_free_ht_irq(int irq)
+{
+ irq_domain_free_irqs(irq, 1);
+}
+
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
{
struct irq_cfg *cfg;
struct ht_irq_msg msg;
- unsigned dest;
- int err;

if (disable_apic)
return -ENXIO;

cfg = irq_cfg(irq);
- err = assign_irq_vector(irq, cfg, apic->target_cpus());
- if (err)
- return err;
-
- err = apic->cpu_mask_to_apicid_and(cfg->domain,
- apic->target_cpus(), &dest);
- if (err)
- return err;
-
- msg.address_hi = HT_IRQ_HIGH_DEST_ID(dest);
+ msg.address_hi = HT_IRQ_HIGH_DEST_ID(cfg->dest_apicid);

msg.address_lo =
HT_IRQ_LOW_BASE |
- HT_IRQ_LOW_DEST_ID(dest) |
+ HT_IRQ_LOW_DEST_ID(cfg->dest_apicid) |
HT_IRQ_LOW_VECTOR(cfg->vector) |
((apic->irq_dest_mode == 0) ?
HT_IRQ_LOW_DM_PHYSICAL :
diff --git a/drivers/pci/htirq.c b/drivers/pci/htirq.c
index a94dd2c4183a..ceb0ebeb7b5f 100644
--- a/drivers/pci/htirq.c
+++ b/drivers/pci/htirq.c
@@ -117,8 +117,8 @@ int __ht_create_irq(struct pci_dev *dev, int idx, ht_irq_update_t *update)
cfg->msg.address_lo = 0xffffffff;
cfg->msg.address_hi = 0xffffffff;

- irq = irq_alloc_hwirq(dev_to_node(&dev->dev));
- if (!irq) {
+ irq = arch_alloc_ht_irq(dev);
+ if (irq <= 0) {
kfree(cfg);
return -EBUSY;
}
@@ -163,8 +163,7 @@ void ht_destroy_irq(unsigned int irq)
cfg = irq_get_handler_data(irq);
irq_set_chip(irq, NULL);
irq_set_handler_data(irq, NULL);
- irq_free_hwirq(irq);
-
+ arch_free_ht_irq(irq);
kfree(cfg);
}
EXPORT_SYMBOL(ht_destroy_irq);
diff --git a/include/linux/htirq.h b/include/linux/htirq.h
index 70a1dbbf2093..5caa51b7b95c 100644
--- a/include/linux/htirq.h
+++ b/include/linux/htirq.h
@@ -15,6 +15,8 @@ void unmask_ht_irq(struct irq_data *data);

/* The arch hook for getting things started */
int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev);
+int arch_alloc_ht_irq(struct pci_dev *dev);
+void arch_free_ht_irq(int irq);

/* For drivers of buggy hardware */
typedef void (ht_irq_update_t)(struct pci_dev *dev, int irq,
--
1.7.10.4