[PATCH v0 03/15] x86/hyperv: add insufficient memory support in irqdomain.c

[Mukesh R]

From: Mukesh Rathor <mrathor at linux.microsoft.com>

Passthru exposes insufficient memory hypercall failure in the current map
device interrupt hypercall. In case of such a failure, we must deposit
more memory and redo the hypercall. Add support for that. Deposit memory
needs partition id, make that a parameter to the map interrupt function.

Signed-off-by: Mukesh Rathor <mrathor at linux.microsoft.com>
---
 arch/x86/hyperv/irqdomain.c | 38 +++++++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/arch/x86/hyperv/irqdomain.c b/arch/x86/hyperv/irqdomain.c
index f6b61483b3b8..ccbe5848a28f 100644
--- a/arch/x86/hyperv/irqdomain.c
+++ b/arch/x86/hyperv/irqdomain.c
@@ -13,8 +13,9 @@
 #include <linux/irqchip/irq-msi-lib.h>
 #include <asm/mshyperv.h>
 
-static int hv_map_interrupt(union hv_device_id hv_devid, bool level,
-		int cpu, int vector, struct hv_interrupt_entry *ret_entry)
+static u64 hv_map_interrupt_hcall(u64 ptid, union hv_device_id hv_devid,
+				  bool level, int cpu, int vector,
+				  struct hv_interrupt_entry *ret_entry)
 {
 	struct hv_input_map_device_interrupt *input;
 	struct hv_output_map_device_interrupt *output;
@@ -30,8 +31,10 @@ static int hv_map_interrupt(union hv_device_id hv_devid, bool level,
 
 	intr_desc = &input->interrupt_descriptor;
 	memset(input, 0, sizeof(*input));
-	input->partition_id = hv_current_partition_id;
+
+	input->partition_id = ptid;
 	input->device_id = hv_devid.as_uint64;
+
 	intr_desc->interrupt_type = HV_X64_INTERRUPT_TYPE_FIXED;
 	intr_desc->vector_count = 1;
 	intr_desc->target.vector = vector;
@@ -64,6 +67,28 @@ static int hv_map_interrupt(union hv_device_id hv_devid, bool level,
 
 	local_irq_restore(flags);
 
+	return status;
+}
+
+static int hv_map_interrupt(u64 ptid, union hv_device_id device_id, bool level,
+			    int cpu, int vector,
+			    struct hv_interrupt_entry *ret_entry)
+{
+	u64 status;
+	int rc, deposit_pgs = 16;		/* don't loop forever */
+
+	while (deposit_pgs--) {
+		status = hv_map_interrupt_hcall(ptid, device_id, level, cpu,
+						vector, ret_entry);
+
+		if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY)
+			break;
+
+		rc = hv_call_deposit_pages(NUMA_NO_NODE, ptid, 1);
+		if (rc)
+			break;
+	};
+
 	if (!hv_result_success(status))
 		hv_status_err(status, "\n");
 
@@ -199,8 +224,8 @@ int hv_map_msi_interrupt(struct irq_data *data,
 	hv_devid = hv_build_devid_type_pci(pdev);
 	cpu = cpumask_first(irq_data_get_effective_affinity_mask(data));
 
-	return hv_map_interrupt(hv_devid, false, cpu, cfg->vector,
-				out_entry ? out_entry : &dummy);
+	return hv_map_interrupt(hv_current_partition_id, hv_devid, false, cpu,
+				cfg->vector, out_entry ? out_entry : &dummy);
 }
 EXPORT_SYMBOL_GPL(hv_map_msi_interrupt);
 
@@ -422,6 +447,7 @@ int hv_map_ioapic_interrupt(int ioapic_id, bool level, int cpu, int vector,
 	hv_devid.device_type = HV_DEVICE_TYPE_IOAPIC;
 	hv_devid.ioapic.ioapic_id = (u8)ioapic_id;
 
-	return hv_map_interrupt(hv_devid, level, cpu, vector, entry);
+	return hv_map_interrupt(hv_current_partition_id, hv_devid, level, cpu,
+				vector, entry);
 }
 EXPORT_SYMBOL_GPL(hv_map_ioapic_interrupt);
-- 
2.51.2.vfs.0.1