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Subject[Patch Part1 v7 19/38] iommu/vt-d: Refine the interfaces to create IRQ for DMAR unit
Date
Refine the interfaces to create IRQ for DMAR unit. It's a preparation
for converting DMAR IRQ to hierarchy irqdomain on x86.

It also moves dmar_alloc_hwirq()/dmar_free_hwirq() from irq_remapping.h
to dmar.h. They are not irq_remapping specific.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: iommu@lists.linux-foundation.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>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Vinod Koul <vinod.koul@intel.com>
Link: http://lkml.kernel.org/r/1416894816-23245-20-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/ia64/include/asm/irq_remapping.h | 2 --
arch/ia64/kernel/msi_ia64.c | 30 +++++++++++++++++++-----------
arch/x86/include/asm/irq_remapping.h | 4 ----
arch/x86/kernel/apic/msi.c | 24 +++++++++++++-----------
drivers/iommu/dmar.c | 19 +++++--------------
include/linux/dmar.h | 3 ++-
6 files changed, 39 insertions(+), 43 deletions(-)

diff --git a/arch/ia64/include/asm/irq_remapping.h b/arch/ia64/include/asm/irq_remapping.h
index e3b3556e2e1b..a8687b1d8906 100644
--- a/arch/ia64/include/asm/irq_remapping.h
+++ b/arch/ia64/include/asm/irq_remapping.h
@@ -1,6 +1,4 @@
#ifndef __IA64_INTR_REMAPPING_H
#define __IA64_INTR_REMAPPING_H
#define irq_remapping_enabled 0
-#define dmar_alloc_hwirq create_irq
-#define dmar_free_hwirq destroy_irq
#endif
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
index 8ae36ea177d3..3f6b76135645 100644
--- a/arch/ia64/kernel/msi_ia64.c
+++ b/arch/ia64/kernel/msi_ia64.c
@@ -166,7 +166,7 @@ static struct irq_chip dmar_msi_type = {
.irq_retrigger = ia64_msi_retrigger_irq,
};

-static int
+static void
msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
{
struct irq_cfg *cfg = irq_cfg + irq;
@@ -188,21 +188,29 @@ msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
MSI_DATA_LEVEL_ASSERT |
MSI_DATA_DELIVERY_FIXED |
MSI_DATA_VECTOR(cfg->vector);
- return 0;
}

-int arch_setup_dmar_msi(unsigned int irq)
+int dmar_alloc_hwirq(int id, int node, void *arg)
{
- int ret;
+ int irq;
struct msi_msg msg;

- ret = msi_compose_msg(NULL, irq, &msg);
- if (ret < 0)
- return ret;
- dmar_msi_write(irq, &msg);
- irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
- "edge");
- return 0;
+ irq = create_irq();
+ if (irq > 0) {
+ irq_set_handler_data(irq, arg);
+ irq_set_chip_and_handler_name(irq, &dmar_msi_type,
+ handle_edge_irq, "edge");
+ msi_compose_msg(NULL, irq, &msg);
+ dmar_msi_write(irq, &msg);
+ }
+
+ return irq;
+}
+
+void dmar_free_hwirq(int irq)
+{
+ irq_set_handler_data(irq, NULL);
+ destroy_irq(irq);
}
#endif /* CONFIG_INTEL_IOMMU */

diff --git a/arch/x86/include/asm/irq_remapping.h b/arch/x86/include/asm/irq_remapping.h
index a6d0cca0d08f..79f1a84e6a85 100644
--- a/arch/x86/include/asm/irq_remapping.h
+++ b/arch/x86/include/asm/irq_remapping.h
@@ -117,8 +117,4 @@ irq_remapping_get_irq_domain(struct irq_alloc_info *info)

#define irq_remapping_print_chip NULL
#endif /* CONFIG_IRQ_REMAP */
-
-extern int dmar_alloc_hwirq(void);
-extern void dmar_free_hwirq(int irq);
-
#endif /* __X86_IRQ_REMAPPING_H */
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index afaaa1166a7d..695c82bbd682 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -228,25 +228,27 @@ static struct irq_chip dmar_msi_type = {
.flags = IRQCHIP_SKIP_SET_WAKE,
};

-int arch_setup_dmar_msi(unsigned int irq)
+int dmar_alloc_hwirq(int id, int node, void *arg)
{
+ int irq;
struct msi_msg msg;
- struct irq_cfg *cfg = irq_cfg(irq);

- native_compose_msi_msg(cfg, &msg);
- dmar_msi_write(irq, &msg);
- irq_set_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq,
- "edge");
- return 0;
-}
+ irq = irq_domain_alloc_irqs(NULL, 1, node, NULL);
+ if (irq > 0) {
+ irq_set_handler_data(irq, arg);
+ irq_set_chip_and_handler_name(irq, &dmar_msi_type,
+ handle_edge_irq, "edge");
+ native_compose_msi_msg(irq_cfg(irq), &msg);
+ dmar_msi_write(irq, &msg);
+ }

-int dmar_alloc_hwirq(void)
-{
- return irq_domain_alloc_irqs(NULL, 1, NUMA_NO_NODE, NULL);
+ return irq;
}

void dmar_free_hwirq(int irq)
{
+ irq_set_handler_data(irq, NULL);
+ irq_set_handler(irq, NULL);
irq_domain_free_irqs(irq, 1);
}
#endif
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index 9847613085e1..536f2d8ea41a 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1087,8 +1087,8 @@ static void free_iommu(struct intel_iommu *iommu)

if (iommu->irq) {
free_irq(iommu->irq, iommu);
- irq_set_handler_data(iommu->irq, NULL);
dmar_free_hwirq(iommu->irq);
+ iommu->irq = 0;
}

if (iommu->qi) {
@@ -1642,23 +1642,14 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
if (iommu->irq)
return 0;

- irq = dmar_alloc_hwirq();
- if (irq <= 0) {
+ irq = dmar_alloc_hwirq(iommu->seq_id, iommu->node, iommu);
+ if (irq > 0) {
+ iommu->irq = irq;
+ } else {
pr_err("IOMMU: no free vectors\n");
return -EINVAL;
}

- irq_set_handler_data(irq, iommu);
- iommu->irq = irq;
-
- ret = arch_setup_dmar_msi(irq);
- if (ret) {
- irq_set_handler_data(irq, NULL);
- iommu->irq = 0;
- dmar_free_hwirq(irq);
- return ret;
- }
-
ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu);
if (ret)
pr_err("IOMMU: can't request irq\n");
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 30624954dec5..84737565c1fd 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -227,6 +227,7 @@ extern void dmar_msi_read(int irq, struct msi_msg *msg);
extern void dmar_msi_write(int irq, struct msi_msg *msg);
extern int dmar_set_interrupt(struct intel_iommu *iommu);
extern irqreturn_t dmar_fault(int irq, void *dev_id);
-extern int arch_setup_dmar_msi(unsigned int irq);
+extern int dmar_alloc_hwirq(int id, int node, void *arg);
+extern void dmar_free_hwirq(int irq);

#endif /* __DMAR_H__ */
--
1.7.10.4


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