From: Stanislav Kinsburskii <stanislav.kinsburskii@xxxxxxxxx>
This patch moves a part of currently internal logic into the new
hv_map_msi_interrupt function and makes it globally available helper,
which will be used to map PCI interrupts in case of root partition.
Signed-off-by: Stanislav Kinsburskii <stanislav.kinsburskii@xxxxxxxxx>
CC: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
CC: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu@xxxxxxxxxx>
CC: Dexuan Cui <decui@xxxxxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
CC: Borislav Petkov <bp@xxxxxxxxx>
CC: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
CC: x86@xxxxxxxxxx
CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
CC: linux-hyperv@xxxxxxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx
---
arch/x86/hyperv/irqdomain.c | 40 +++++++++++++++++++++++++++------------
arch/x86/include/asm/mshyperv.h | 2 ++
2 files changed, 30 insertions(+), 12 deletions(-)
diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c
index 42c70d28ef27..fd9c487726e3 100644
--- a/arch/x86/hyperv/irqdomain.c
+++ b/arch/x86/hyperv/irqdomain.c
@@ -169,13 +169,35 @@ static union hv_device_id hv_build_pci_dev_id(struct pci_dev *dev)
return dev_id;
}
-static int hv_map_msi_interrupt(struct pci_dev *dev, int cpu, int vector,
- struct hv_interrupt_entry *entry)
+/**
+ * hv_map_msi_interrupt() - "Map" the MSI IRQ in the hypervisor.
+ * @data: Describes the IRQ
+ * @out_entry: Hypervisor (MSI) interrupt entry (can be NULL)
+ *
+ * Map the IRQ in the hypervisor by issuing a MAP_DEVICE_INTERRUPT hypercall.
+ */
+int hv_map_msi_interrupt(struct irq_data *data,
+ struct hv_interrupt_entry *out_entry)
{
- union hv_device_id device_id = hv_build_pci_dev_id(dev);
+ struct msi_desc *msidesc;
+ struct pci_dev *dev;
+ union hv_device_id device_id;
+ struct hv_interrupt_entry dummy, *entry;
+ struct irq_cfg *cfg = irqd_cfg(data);
+ const cpumask_t *affinity;
+ int cpu, vector;
+
+ msidesc = irq_data_get_msi_desc(data);
+ dev = msi_desc_to_pci_dev(msidesc);
+ device_id = hv_build_pci_dev_id(dev);
+ affinity = irq_data_get_effective_affinity_mask(data);
+ cpu = cpumask_first_and(affinity, cpu_online_mask);
+ entry = out_entry ? out_entry : &dummy;
+ vector = cfg->vector;
return hv_map_interrupt(device_id, false, cpu, vector, entry);
}
+EXPORT_SYMBOL_GPL(hv_map_msi_interrupt);
static inline void entry_to_msi_msg(struct hv_interrupt_entry *entry, struct msi_msg *msg)
{
@@ -190,10 +212,8 @@ static void hv_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
{
struct msi_desc *msidesc;
struct pci_dev *dev;
- struct hv_interrupt_entry out_entry, *stored_entry;
+ struct hv_interrupt_entry *stored_entry;
struct irq_cfg *cfg = irqd_cfg(data);
- const cpumask_t *affinity;
- int cpu;
u64 status;
msidesc = irq_data_get_msi_desc(data);
@@ -204,9 +224,6 @@ static void hv_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return;
}
- affinity = irq_data_get_effective_affinity_mask(data);
- cpu = cpumask_first_and(affinity, cpu_online_mask);
-
if (data->chip_data) {
/*
* This interrupt is already mapped. Let's unmap first.
@@ -235,15 +252,14 @@ static void hv_irq_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return;
}
- status = hv_map_msi_interrupt(dev, cpu, cfg->vector, &out_entry);
+ status = hv_map_msi_interrupt(data, stored_entry);
if (status != HV_STATUS_SUCCESS) {
kfree(stored_entry);
return;
}
- *stored_entry = out_entry;
data->chip_data = stored_entry;
- entry_to_msi_msg(&out_entry, msg);
+ entry_to_msi_msg(data->chip_data, msg);
return;
}
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 4c4c0ec3b62e..aa0e83acacbd 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -203,6 +203,8 @@ static inline void hv_apic_init(void) {}
struct irq_domain *hv_create_pci_msi_domain(void);
+int hv_map_msi_interrupt(struct irq_data *data,
+ struct hv_interrupt_entry *out_entry);
int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
struct hv_interrupt_entry *entry);
int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
