drm/i915/gvt: Change for_each_pipe to use pipe_valid API

Add a new API to check if a given pipe is valid using
DISPLAY_RUNTIME_INFO() for GVT.

Update GVT to use this API instead of accessing
`DISPLAY_RUNTIME_INFO->pipe_mask` directly in the `for_each_pipe` macro.

Since `for_each_pipe` is defined in i915/display/intel_display.h, which
also contains other macros used by gvt/display.c, we cannot drop the
intel_display.h header yet. This causes a build error because
`for_each_pipe` is included from both i915/display/intel_display.h and
gvt/display_helpers.h.

To resolve this, rename the GVT macro to `gvt_for_each_pipe` and make it
call the new API. This avoids exposing display internals and prepares for
display modularization.

v2:
 - Expose API to check if pipe is valid rather than the runtime info
   pipe mask. (Jani)
 - Rename the macro to `gvt_for_each_pipe` to resolve build error.
v3:
 - Use EXPORT_SYMBOL_NS_GPL(..., "I915_GVT"); (Jani)
 - Use enum pipe at call sites instead of casting in the macro. (Jani)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20251219060302.2365123-5-ankit.k.nautiyal@intel.com

4 files changed, 19 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_gvt_api.c b/drivers/gpu/drm/i915/display/intel_gvt_api.c
index b1bfe4843135..a69e249395ae 100644
--- a/drivers/gpu/drm/i915/display/intel_gvt_api.c
+++ b/drivers/gpu/drm/i915/display/intel_gvt_api.c
@@ -32,3 +32,12 @@ u32 intel_display_device_mmio_base(struct intel_display *display)
 	return DISPLAY_MMIO_BASE(display);
 }
 EXPORT_SYMBOL_NS_GPL(intel_display_device_mmio_base, "I915_GVT");
+
+bool intel_display_device_pipe_valid(struct intel_display *display, enum pipe pipe)
+{
+	if (pipe < PIPE_A || pipe >= I915_MAX_PIPES)
+		return false;
+
+	return DISPLAY_RUNTIME_INFO(display)->pipe_mask & BIT(pipe);
+}
+EXPORT_SYMBOL_NS_GPL(intel_display_device_pipe_valid, "I915_GVT");
diff --git a/drivers/gpu/drm/i915/display/intel_gvt_api.h b/drivers/gpu/drm/i915/display/intel_gvt_api.h
index 53c851c3479d..d4eea74026c6 100644
--- a/drivers/gpu/drm/i915/display/intel_gvt_api.h
+++ b/drivers/gpu/drm/i915/display/intel_gvt_api.h
@@ -16,5 +16,6 @@ u32 intel_display_device_pipe_offset(struct intel_display *display, enum pipe pi
 u32 intel_display_device_trans_offset(struct intel_display *display, enum transcoder trans);
 u32 intel_display_device_cursor_offset(struct intel_display *display, enum pipe pipe);
 u32 intel_display_device_mmio_base(struct intel_display *display);
+bool intel_display_device_pipe_valid(struct intel_display *display, enum pipe pipe);
 
 #endif /* __INTEL_GVT_API_H__ */
diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
index 9d6b22b2e4d0..1d0c581a8ccc 100644
--- a/drivers/gpu/drm/i915/gvt/display.c
+++ b/drivers/gpu/drm/i915/gvt/display.c
@@ -188,7 +188,7 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
 	struct intel_display *display = dev_priv->display;
-	int pipe;
+	enum pipe pipe;
 
 	if (IS_BROXTON(dev_priv)) {
 		enum transcoder trans;
@@ -200,7 +200,7 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 			  GEN8_DE_PORT_HOTPLUG(HPD_PORT_B) |
 			  GEN8_DE_PORT_HOTPLUG(HPD_PORT_C));
 
-		for_each_pipe(display, pipe) {
+		gvt_for_each_pipe(display, pipe) {
 			vgpu_vreg_t(vgpu, TRANSCONF(display, pipe)) &=
 				~(TRANSCONF_ENABLE | TRANSCONF_STATE_ENABLE);
 			vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) &= ~DISP_ENABLE;
@@ -516,7 +516,7 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 		vgpu_vreg_t(vgpu, PCH_ADPA) &= ~ADPA_CRT_HOTPLUG_MONITOR_MASK;
 
 	/* Disable Primary/Sprite/Cursor plane */
-	for_each_pipe(display, pipe) {
+	gvt_for_each_pipe(display, pipe) {
 		vgpu_vreg_t(vgpu, DSPCNTR(display, pipe)) &= ~DISP_ENABLE;
 		vgpu_vreg_t(vgpu, SPRCTL(pipe)) &= ~SPRITE_ENABLE;
 		vgpu_vreg_t(vgpu, CURCNTR(display, pipe)) &= ~MCURSOR_MODE_MASK;
@@ -669,10 +669,10 @@ void intel_vgpu_emulate_vblank(struct intel_vgpu *vgpu)
 {
 	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
 	struct intel_display *display = i915->display;
-	int pipe;
+	enum pipe pipe;
 
 	mutex_lock(&vgpu->vgpu_lock);
-	for_each_pipe(display, pipe)
+	gvt_for_each_pipe(display, pipe)
 		emulate_vblank_on_pipe(vgpu, pipe);
 	mutex_unlock(&vgpu->vgpu_lock);
 }
diff --git a/drivers/gpu/drm/i915/gvt/display_helpers.h b/drivers/gpu/drm/i915/gvt/display_helpers.h
index cbe383f677d5..d0975ed507d3 100644
--- a/drivers/gpu/drm/i915/gvt/display_helpers.h
+++ b/drivers/gpu/drm/i915/gvt/display_helpers.h
@@ -42,4 +42,8 @@
 #define INTEL_DISPLAY_DEVICE_CURSOR_OFFSET(display, pipe) \
 	intel_display_device_cursor_offset((display), (pipe))
 
+#define gvt_for_each_pipe(display, __p) \
+	for ((__p) = PIPE_A; (__p) < I915_MAX_PIPES; (__p)++) \
+		for_each_if(intel_display_device_pipe_valid((display), (__p)))
+
 #endif /* __DISPLAY_HELPERS_H__ */