[PATCH V2] iommu/hyperv: Create hyperv subdirectory under drivers/iommu

[Mukesh R <mrathor@linux.microsoft.com>]

Create hyperv subdirectory under drivers/iommu in anticipation of more
hyperv related files from upcoming PCI passthru and pv-IOMMU patches.
Also, the current file hyperv-iommu.c actually implements irq remapping on
x86, so rename to more appropriate hv-irq-remap-x86.c and move it under
the new hyperv subdirectory. Since this file implements irq_remap_ops
exposed by drivers/iommu/irq_remapping.h, it cannot be relocated to the
irq directory. This is in sync with other backend directories like amd
and intel there.

Lastly, this file should not be tied to CONFIG_HYPERV_IOMMU, but to
CONFIG_HYPERV and CONFIG_IRQ_REMAP.

Signed-off-by: Mukesh R <mrathor@linux.microsoft.com>
---
V2: rename hv-irq-remap.c to hv-irq-remap-x86.c
---
 MAINTAINERS                                              | 2 +-
 drivers/iommu/Kconfig                                    | 9 ---------
 drivers/iommu/Makefile                                   | 2 +-
 drivers/iommu/hyperv/Makefile                            | 2 ++
 .../iommu/{hyperv-iommu.c => hyperv/hv-irq-remap-x86.c}  | 8 +-------
 drivers/iommu/irq_remapping.c                            | 2 +-
 6 files changed, 6 insertions(+), 19 deletions(-)
 create mode 100644 drivers/iommu/hyperv/Makefile
 rename drivers/iommu/{hyperv-iommu.c => hyperv/hv-irq-remap-x86.c} (99%)

diff --git a/MAINTAINERS b/MAINTAINERS
index b539be153f6a..93a7105e9cef 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11988,7 +11988,7 @@ F:	drivers/clocksource/hyperv_timer.c
 F:	drivers/hid/hid-hyperv.c
 F:	drivers/hv/
 F:	drivers/input/serio/hyperv-keyboard.c
-F:	drivers/iommu/hyperv-iommu.c
+F:	drivers/iommu/hyperv/
 F:	drivers/net/ethernet/microsoft/
 F:	drivers/net/hyperv/
 F:	drivers/pci/controller/pci-hyperv-intf.c
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f86262b11416..1becc0f20222 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -351,15 +351,6 @@ config MTK_IOMMU_V1
 
 	  if unsure, say N here.
 
-config HYPERV_IOMMU
-	bool "Hyper-V IRQ Handling"
-	depends on HYPERV && X86
-	select IOMMU_API
-	default HYPERV
-	help
-	  Stub IOMMU driver to handle IRQs to support Hyper-V Linux
-	  guest and root partitions.
-
 config VIRTIO_IOMMU
 	tristate "Virtio IOMMU driver"
 	depends on VIRTIO
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index 0275821f4ef9..d9683422aecb 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_AMD_IOMMU) += amd/
 obj-$(CONFIG_INTEL_IOMMU) += intel/
 obj-$(CONFIG_RISCV_IOMMU) += riscv/
 obj-$(CONFIG_GENERIC_PT) += generic_pt/fmt/
+obj-$(CONFIG_HYPERV) += hyperv/
 obj-$(CONFIG_IOMMU_API) += iommu.o
 obj-$(CONFIG_IOMMU_SUPPORT) += iommu-pages.o
 obj-$(CONFIG_IOMMU_API) += iommu-traces.o
@@ -30,7 +31,6 @@ obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
 obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
 obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o
 obj-$(CONFIG_S390_IOMMU) += s390-iommu.o
-obj-$(CONFIG_HYPERV_IOMMU) += hyperv-iommu.o
 obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
 obj-$(CONFIG_IOMMU_SVA) += iommu-sva.o
 obj-$(CONFIG_IOMMU_IOPF) += io-pgfault.o
diff --git a/drivers/iommu/hyperv/Makefile b/drivers/iommu/hyperv/Makefile
new file mode 100644
index 000000000000..6ef0ef97f3dd
--- /dev/null
+++ b/drivers/iommu/hyperv/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_IRQ_REMAP) += hv-irq-remap-x86.o
diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv/hv-irq-remap-x86.c
similarity index 99%
rename from drivers/iommu/hyperv-iommu.c
rename to drivers/iommu/hyperv/hv-irq-remap-x86.c
index 479103261ae6..b34ee9589190 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv/hv-irq-remap-x86.c
@@ -7,13 +7,11 @@
  *
  * Author : Lan Tianyu <Tianyu.Lan@microsoft.com>
  */
-
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/iommu.h>
 #include <linux/module.h>
-
 #include <asm/apic.h>
 #include <asm/cpu.h>
 #include <asm/hw_irq.h>
@@ -22,9 +20,7 @@
 #include <asm/hypervisor.h>
 #include <asm/mshyperv.h>
 
-#include "irq_remapping.h"
-
-#ifdef CONFIG_IRQ_REMAP
+#include "../irq_remapping.h"
 
 /*
  * According 82093AA IO-APIC spec , IO APIC has a 24-entry Interrupt
@@ -330,5 +326,3 @@ static const struct irq_domain_ops hyperv_root_ir_domain_ops = {
 	.alloc = hyperv_root_irq_remapping_alloc,
 	.free = hyperv_root_irq_remapping_free,
 };
-
-#endif
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index c2443659812a..41bf65e4ea88 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -108,7 +108,7 @@ int __init irq_remapping_prepare(void)
 	else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
 		 amd_iommu_irq_ops.prepare() == 0)
 		remap_ops = &amd_iommu_irq_ops;
-	else if (IS_ENABLED(CONFIG_HYPERV_IOMMU) &&
+	else if (IS_ENABLED(CONFIG_HYPERV) &&
 		 hyperv_irq_remap_ops.prepare() == 0)
 		remap_ops = &hyperv_irq_remap_ops;
 	else
-- 
2.51.2.vfs.0.1