linux-kernel - [PATCH v4 1/8] drm/i915/fbdev: Add intel_fbdev_get

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Message-ID: <20250213112620.1923927-2-jfalempe@redhat.com>
Date: Thu, 13 Feb 2025 12:19:25 +0100
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Jani Nikula <jani.nikula@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	intel-gfx@...ts.freedesktop.org,
	intel-xe@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Subject: [PATCH v4 1/8] drm/i915/fbdev: Add intel_fbdev_get_map()

The vaddr of the fbdev framebuffer is private to the struct
intel_fbdev, so this function is needed to access it for drm_panic.
Also the struct i915_vma is different between i915 and xe, so it
requires a few functions to access fbdev->vma->iomap.

Signed-off-by: Jocelyn Falempe <jfalempe@...hat.com>
---


v2:
 * Add intel_fb_get_vaddr() and i915_vma_get_iomap() to build with Xe driver.
 
v4:
 * rename to get_map(), and return the struct iosys_map mapping.
 * implement the Xe variant.
 
 drivers/gpu/drm/i915/display/intel_fb_pin.c | 5 +++++
 drivers/gpu/drm/i915/display/intel_fb_pin.h | 2 ++
 drivers/gpu/drm/i915/display/intel_fbdev.c  | 5 +++++
 drivers/gpu/drm/i915/display/intel_fbdev.h  | 6 ++++++
 drivers/gpu/drm/i915/i915_vma.h             | 5 +++++
 drivers/gpu/drm/xe/display/xe_fb_pin.c      | 5 +++++
 6 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_fb_pin.c b/drivers/gpu/drm/i915/display/intel_fb_pin.c
index d3a86f9c6bc86..3d346d51900f0 100644
--- a/drivers/gpu/drm/i915/display/intel_fb_pin.c
+++ b/drivers/gpu/drm/i915/display/intel_fb_pin.c
@@ -327,3 +327,8 @@ void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state)
 			intel_dpt_unpin_from_ggtt(fb->dpt_vm);
 	}
 }
+
+void intel_fb_get_map(struct i915_vma *vma, struct iosys_map *map)
+{
+	iosys_map_set_vaddr_iomem(map, i915_vma_get_iomap(vma));
+}
diff --git a/drivers/gpu/drm/i915/display/intel_fb_pin.h b/drivers/gpu/drm/i915/display/intel_fb_pin.h
index ac0319b53af08..a5e7cec4e2c86 100644
--- a/drivers/gpu/drm/i915/display/intel_fb_pin.h
+++ b/drivers/gpu/drm/i915/display/intel_fb_pin.h
@@ -12,6 +12,7 @@ struct drm_framebuffer;
 struct i915_vma;
 struct intel_plane_state;
 struct i915_gtt_view;
+struct iosys_map;
 
 struct i915_vma *
 intel_fb_pin_to_ggtt(const struct drm_framebuffer *fb,
@@ -25,5 +26,6 @@ void intel_fb_unpin_vma(struct i915_vma *vma, unsigned long flags);
 
 int intel_plane_pin_fb(struct intel_plane_state *plane_state);
 void intel_plane_unpin_fb(struct intel_plane_state *old_plane_state);
+void intel_fb_get_map(struct i915_vma *vma, struct iosys_map *map);
 
 #endif
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 00852ff5b2470..39a39e8672309 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -695,3 +695,8 @@ struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 
 	return to_intel_framebuffer(fbdev->helper.fb);
 }
+
+void intel_fbdev_get_map(struct intel_fbdev *fbdev, struct iosys_map *map)
+{
+	intel_fb_get_map(fbdev->vma, map);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.h b/drivers/gpu/drm/i915/display/intel_fbdev.h
index 08de2d5b34338..3782e65bc8207 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.h
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.h
@@ -12,11 +12,13 @@ struct drm_device;
 struct drm_i915_private;
 struct intel_fbdev;
 struct intel_framebuffer;
+struct iosys_map;
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 void intel_fbdev_setup(struct drm_i915_private *dev_priv);
 void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous);
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev);
+void intel_fbdev_get_map(struct intel_fbdev *fbdev, struct iosys_map *map);
 #else
 static inline void intel_fbdev_setup(struct drm_i915_private *dev_priv)
 {
@@ -30,6 +32,10 @@ static inline struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbd
 {
 	return NULL;
 }
+
+static inline void intel_fbdev_get_map(struct intel_fbdev *fbdev, struct iosys_map *map)
+{
+}
 #endif
 
 #endif /* __INTEL_FBDEV_H__ */
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 6a6be8048aa83..4ae610927fa77 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -353,6 +353,11 @@ static inline bool i915_node_color_differs(const struct drm_mm_node *node,
 	return drm_mm_node_allocated(node) && node->color != color;
 }
 
+static inline void __iomem *i915_vma_get_iomap(struct i915_vma *vma)
+{
+	return READ_ONCE(vma->iomap);
+}
+
 /**
  * i915_vma_pin_iomap - calls ioremap_wc to map the GGTT VMA via the aperture
  * @vma: VMA to iomap
diff --git a/drivers/gpu/drm/xe/display/xe_fb_pin.c b/drivers/gpu/drm/xe/display/xe_fb_pin.c
index 9fa51b84737ca..2773f55bb7143 100644
--- a/drivers/gpu/drm/xe/display/xe_fb_pin.c
+++ b/drivers/gpu/drm/xe/display/xe_fb_pin.c
@@ -423,3 +423,8 @@ u64 intel_dpt_offset(struct i915_vma *dpt_vma)
 {
 	return 0;
 }
+
+void intel_fb_get_map(struct i915_vma *vma, struct iosys_map *map)
+{
+	*map = vma->bo->vmap;
+}
-- 
2.47.1