[PATCH v2 80/86] drm/i915: Remove struct drm_fb_helper from struct intel_fbdev

[Thomas Zimmermann <tzimmermann@suse.de>]

Store instances of drm_fb_helper and struct intel_fbdev separately.
This will allow i915 to use the common fbdev client, which allocates
its own instance of struct drm_fb_helper.

There is at most one instance of each per DRM device, so both can be
referenced directly from the i915 and DRM device structures. A later
patchset might rework the common fbdev client to allow for storing
both, drm_fb_helper and intel_fbdev, together in the same place.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbdev.c | 86 ++++++++++++----------
 1 file changed, 47 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 49a1ac4f5491..9ece62783ce1 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -42,6 +42,7 @@
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_managed.h>
 
 #include "gem/i915_gem_mman.h"
 #include "gem/i915_gem_object.h"
@@ -55,7 +56,6 @@
 #include "intel_frontbuffer.h"
 
 struct intel_fbdev {
-	struct drm_fb_helper helper;
 	struct intel_framebuffer *fb;
 	struct i915_vma *vma;
 	unsigned long vma_flags;
@@ -70,11 +70,6 @@ struct intel_fbdev {
 	struct mutex hpd_lock;
 };
 
-static struct intel_fbdev *to_intel_fbdev(struct drm_fb_helper *fb_helper)
-{
-	return container_of(fb_helper, struct intel_fbdev, helper);
-}
-
 static struct intel_frontbuffer *to_frontbuffer(struct intel_fbdev *ifbdev)
 {
 	return ifbdev->fb->frontbuffer;
@@ -91,7 +86,9 @@ FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(intel_fbdev,
 
 static int intel_fbdev_set_par(struct fb_info *info)
 {
-	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_i915_private *i915 = to_i915(fb_helper->client.dev);
+	struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 	int ret;
 
 	ret = drm_fb_helper_set_par(info);
@@ -103,7 +100,9 @@ static int intel_fbdev_set_par(struct fb_info *info)
 
 static int intel_fbdev_blank(int blank, struct fb_info *info)
 {
-	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_i915_private *i915 = to_i915(fb_helper->client.dev);
+	struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 	int ret;
 
 	ret = drm_fb_helper_blank(blank, info);
@@ -116,7 +115,9 @@ static int intel_fbdev_blank(int blank, struct fb_info *info)
 static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 				   struct fb_info *info)
 {
-	struct intel_fbdev *ifbdev = to_intel_fbdev(info->par);
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_i915_private *i915 = to_i915(fb_helper->client.dev);
+	struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 	int ret;
 
 	ret = drm_fb_helper_pan_display(var, info);
@@ -128,8 +129,8 @@ static int intel_fbdev_pan_display(struct fb_var_screeninfo *var,
 
 static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
-	struct intel_fbdev *fbdev = to_intel_fbdev(info->par);
-	struct drm_gem_object *bo = drm_gem_fb_get_obj(&fbdev->fb->base, 0);
+	struct drm_fb_helper *fb_helper = info->par;
+	struct drm_gem_object *bo = drm_gem_fb_get_obj(fb_helper->fb, 0);
 	struct drm_i915_gem_object *obj = to_intel_bo(bo);
 
 	return i915_gem_fb_mmap(obj, vma);
@@ -138,9 +139,11 @@ static int intel_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
 static void intel_fbdev_fb_destroy(struct fb_info *info)
 {
 	struct drm_fb_helper *fb_helper = info->par;
-	struct intel_fbdev *ifbdev = container_of(fb_helper, struct intel_fbdev, helper);
+	struct drm_device *dev = fb_helper->client.dev;
+	struct drm_i915_private *i915 = to_i915(dev);
+	struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
 
-	drm_fb_helper_fini(&ifbdev->helper);
+	drm_fb_helper_fini(fb_helper);
 
 	/*
 	 * We rely on the object-free to release the VMA pinning for
@@ -148,11 +151,11 @@ static void intel_fbdev_fb_destroy(struct fb_info *info)
 	 * trying to rectify all the possible error paths leading here.
 	 */
 	intel_fb_unpin_vma(ifbdev->vma, ifbdev->vma_flags);
-	drm_framebuffer_remove(&ifbdev->fb->base);
+	drm_framebuffer_remove(fb_helper->fb);
 
 	drm_client_release(&fb_helper->client);
-	drm_fb_helper_unprepare(&ifbdev->helper);
-	kfree(ifbdev);
+	drm_fb_helper_unprepare(fb_helper);
+	kfree(fb_helper);
 }
 
 __diag_push();
@@ -175,10 +178,10 @@ __diag_pop();
 static int intelfb_create(struct drm_fb_helper *helper,
 			  struct drm_fb_helper_surface_size *sizes)
 {
-	struct intel_fbdev *ifbdev = to_intel_fbdev(helper);
-	struct intel_framebuffer *fb = ifbdev->fb;
-	struct drm_device *dev = helper->dev;
+	struct drm_device *dev = helper->client.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
+	struct intel_framebuffer *fb = ifbdev->fb;
 	const struct i915_gtt_view view = {
 		.type = I915_GTT_VIEW_NORMAL,
 	};
@@ -243,7 +246,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 		goto out_unpin;
 	}
 
-	ifbdev->helper.fb = &fb->base;
+	helper->fb = &fb->base;
 
 	info->fbops = &intelfb_ops;
 
@@ -253,7 +256,7 @@ static int intelfb_create(struct drm_fb_helper *helper,
 	if (ret)
 		goto out_unpin;
 
-	drm_fb_helper_fill_info(info, &ifbdev->helper, sizes);
+	drm_fb_helper_fill_info(info, dev->fb_helper, sizes);
 
 	/* If the object is shmemfs backed, it will have given us zeroed pages.
 	 * If the object is stolen however, it will be full of whatever
@@ -468,6 +471,7 @@ static void intel_fbdev_suspend_worker(struct work_struct *work)
 static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state)
 {
 	struct intel_fbdev *ifbdev = i915->display.fbdev.fbdev;
+	struct drm_device *dev = &i915->drm;
 	bool send_hpd = false;
 
 	mutex_lock(&ifbdev->hpd_lock);
@@ -478,7 +482,7 @@ static void intel_fbdev_hpd_set_suspend(struct drm_i915_private *i915, int state
 
 	if (send_hpd) {
 		drm_dbg_kms(&i915->drm, "Handling delayed fbcon HPD event\n");
-		drm_fb_helper_hotplug_event(&ifbdev->helper);
+		drm_fb_helper_hotplug_event(dev->fb_helper);
 	}
 }
 
@@ -497,7 +501,7 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous
 	if (!ifbdev->vma)
 		goto set_suspend;
 
-	info = ifbdev->helper.info;
+	info = dev->fb_helper->info;
 
 	if (synchronous) {
 		/* Flush any pending work to turn the console on, and then
@@ -536,7 +540,7 @@ void intel_fbdev_set_suspend(struct drm_device *dev, int state, bool synchronous
 	    !i915_gem_object_is_shmem(intel_fb_obj(&ifbdev->fb->base)))
 		memset_io(info->screen_base, 0, info->screen_size);
 
-	drm_fb_helper_set_suspend(&ifbdev->helper, state);
+	drm_fb_helper_set_suspend(dev->fb_helper, state);
 	console_unlock();
 
 set_suspend:
@@ -556,8 +560,8 @@ static int intel_fbdev_output_poll_changed(struct drm_device *dev)
 	ifbdev->hpd_waiting = true;
 	mutex_unlock(&ifbdev->hpd_lock);
 
-	if (send_hpd && (ifbdev->vma || ifbdev->helper.deferred_setup))
-		drm_fb_helper_hotplug_event(&ifbdev->helper);
+	if (send_hpd && (ifbdev->vma || dev->fb_helper->deferred_setup))
+		drm_fb_helper_hotplug_event(dev->fb_helper);
 
 	return 0;
 }
@@ -565,6 +569,7 @@ static int intel_fbdev_output_poll_changed(struct drm_device *dev)
 static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 {
 	struct intel_fbdev *ifbdev = dev_priv->display.fbdev.fbdev;
+	struct drm_device *dev = &dev_priv->drm;
 	int ret;
 
 	if (!ifbdev)
@@ -573,7 +578,7 @@ static int intel_fbdev_restore_mode(struct drm_i915_private *dev_priv)
 	if (!ifbdev->vma)
 		return -ENOMEM;
 
-	ret = drm_fb_helper_restore_fbdev_mode_unlocked(&ifbdev->helper);
+	ret = drm_fb_helper_restore_fbdev_mode_unlocked(dev->fb_helper);
 	if (ret)
 		return ret;
 
@@ -656,45 +661,48 @@ void intel_fbdev_setup(struct drm_i915_private *i915)
 {
 	struct drm_device *dev = &i915->drm;
 	struct intel_fbdev *ifbdev;
+	struct drm_fb_helper *fb_helper;
 	int ret;
 
 	if (!HAS_DISPLAY(i915))
 		return;
 
-	ifbdev = kzalloc(sizeof(*ifbdev), GFP_KERNEL);
+	ifbdev = drmm_kzalloc(dev, sizeof(*ifbdev), GFP_KERNEL);
 	if (!ifbdev)
 		return;
-	drm_fb_helper_prepare(dev, &ifbdev->helper, 32, &intel_fb_helper_funcs);
 
 	i915->display.fbdev.fbdev = ifbdev;
 	INIT_WORK(&i915->display.fbdev.suspend_work, intel_fbdev_suspend_worker);
 	mutex_init(&ifbdev->hpd_lock);
-	if (intel_fbdev_init_bios(dev, ifbdev))
-		ifbdev->helper.preferred_bpp = ifbdev->preferred_bpp;
-	else
-		ifbdev->preferred_bpp = ifbdev->helper.preferred_bpp;
+	if (!intel_fbdev_init_bios(dev, ifbdev))
+		ifbdev->preferred_bpp = 32;
+
+	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
+	if (!fb_helper)
+		return;
+	drm_fb_helper_prepare(dev, fb_helper, ifbdev->preferred_bpp, &intel_fb_helper_funcs);
 
-	ret = drm_client_init(dev, &ifbdev->helper.client, "intel-fbdev",
+	ret = drm_client_init(dev, &fb_helper->client, "intel-fbdev",
 			      &intel_fbdev_client_funcs);
 	if (ret) {
 		drm_err(dev, "Failed to register client: %d\n", ret);
 		goto err_drm_fb_helper_unprepare;
 	}
 
-	drm_client_register(&ifbdev->helper.client);
+	drm_client_register(&fb_helper->client);
 
 	return;
 
 err_drm_fb_helper_unprepare:
-	drm_fb_helper_unprepare(&ifbdev->helper);
+	drm_fb_helper_unprepare(dev->fb_helper);
 	mutex_destroy(&ifbdev->hpd_lock);
-	kfree(ifbdev);
+	kfree(fb_helper);
 }
 
 struct intel_framebuffer *intel_fbdev_framebuffer(struct intel_fbdev *fbdev)
 {
-	if (!fbdev || !fbdev->helper.fb)
+	if (!fbdev)
 		return NULL;
 
-	return to_intel_framebuffer(fbdev->helper.fb);
+	return fbdev->fb;
 }
-- 
2.46.0