[Intel-gfx] [RFC PATCH v2 1/1] i915/drm: Split out x86 and arm64 functionality

[Casey Bowman]

Some x86 checks are unnecessary on arm64 systems, so they
are being split out to avoid being used.

We are starting the split with run_as_guest(), which has
an x86-specific usage, while on arm64, we aren't using it.

The split reflects the way the kernel currently handles
platform-specific libraries, but these calls are localized
to i915.

Signed-off-by: Casey Bowman <casey.g.bowman at intel.com>
---
 drivers/gpu/drm/i915/Makefile                         |  3 +++
 drivers/gpu/drm/i915/i915_drv.h                       |  7 ++-----
 drivers/gpu/drm/i915/platforms/Makefile               |  8 ++++++++
 .../arm64/include/platform/i915_hypervisor.h          | 11 +++++++++++
 .../platforms/x86/include/platform/i915_hypervisor.h  |  9 +++++++++
 5 files changed, 33 insertions(+), 5 deletions(-)
 create mode 100644 drivers/gpu/drm/i915/platforms/Makefile
 create mode 100644 drivers/gpu/drm/i915/platforms/arm64/include/platform/i915_hypervisor.h
 create mode 100644 drivers/gpu/drm/i915/platforms/x86/include/platform/i915_hypervisor.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 16cab8db012a..f69ed0c10e80 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -29,6 +29,9 @@ subdir-ccflags-y += -I$(srctree)/$(src)
 
 # Please keep these build lists sorted!
 
+# arch support
+include $(src)/platforms/Makefile
+
 # core driver code
 i915-y += i915_driver.o \
 	  i915_config.o \
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 78fa3340101b..ba2cfb4d9830 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -87,6 +87,8 @@
 #include "gt/intel_workarounds.h"
 #include "gt/uc/intel_uc.h"
 
+#include "platform/i915_hypervisor.h"
+
 #include "intel_device_info.h"
 #include "intel_memory_region.h"
 #include "intel_pch.h"
@@ -1498,11 +1500,6 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define INTEL_DISPLAY_ENABLED(dev_priv) \
 	(drm_WARN_ON(&(dev_priv)->drm, !HAS_DISPLAY(dev_priv)), !(dev_priv)->params.disable_display)
 
-static inline bool run_as_guest(void)
-{
-	return !hypervisor_is_type(X86_HYPER_NATIVE);
-}
-
 #define HAS_D12_PLANE_MINIMIZATION(dev_priv) (IS_ROCKETLAKE(dev_priv) || \
 					      IS_ALDERLAKE_S(dev_priv))
 
diff --git a/drivers/gpu/drm/i915/platforms/Makefile b/drivers/gpu/drm/i915/platforms/Makefile
new file mode 100644
index 000000000000..03250b5704ea
--- /dev/null
+++ b/drivers/gpu/drm/i915/platforms/Makefile
@@ -0,0 +1,8 @@
+ifdef CONFIG_X86
+ccflags-y += -I $(srctree)/$(src)/platforms/x86/include/
+endif
+
+ifdef CONFIG_ARM64
+ccflags-y += -I $(srctree)/$(src)/platforms/arm64/include/
+endif
+
diff --git a/drivers/gpu/drm/i915/platforms/arm64/include/platform/i915_hypervisor.h b/drivers/gpu/drm/i915/platforms/arm64/include/platform/i915_hypervisor.h
new file mode 100644
index 000000000000..cd9050711dce
--- /dev/null
+++ b/drivers/gpu/drm/i915/platforms/arm64/include/platform/i915_hypervisor.h
@@ -0,0 +1,11 @@
+#ifndef _I915_HYPERVISOR_
+#define _I915_HYPERVISOR_
+
+
+/* Not supported for arm64, so we return  */
+static inline bool run_as_guest(void)
+{
+	return false;
+}
+
+#endif
diff --git a/drivers/gpu/drm/i915/platforms/x86/include/platform/i915_hypervisor.h b/drivers/gpu/drm/i915/platforms/x86/include/platform/i915_hypervisor.h
new file mode 100644
index 000000000000..5eab54f5e09f
--- /dev/null
+++ b/drivers/gpu/drm/i915/platforms/x86/include/platform/i915_hypervisor.h
@@ -0,0 +1,9 @@
+#ifndef _I915_HYPERVISOR_
+#define _I915_HYPERVISOR_
+
+static inline bool run_as_guest(void)
+{
+	return !hypervisor_is_type(X86_HYPER_NATIVE);
+}
+
+#endif
-- 
2.25.1