drm/vmwgfx: Port the framebuffer code to drm fb helpers

Instead of using vmwgfx specific framebuffer implementation use the drm
fb helpers. There's no change in functionality, the only difference
is a reduction in the amount of code inside the vmwgfx module.

drm fb helpers do not deal correctly with changes in crtc preferred mode
at runtime, but the old fb code wasn't dealing with it either.
Same situation applies to high-res fb consoles - the old code was
limited to 1176x885 because it was checking for legacy/deprecated
memory limites, the drm fb helpers are limited to the initial resolution
set on fb due to first problem (drm fb helpers being unable to handle
hotplug crtc preferred mode changes).

This also removes the kernel config for disabling fb support which hasn't
been used or supported in a very long time.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20221022040236.616490-14-zack@kde.org

1 files changed, 16 insertions, 42 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index b909a3ce9af3..63496773f714 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -35,6 +35,7 @@
 
 #include <drm/drm_aperture.h>
 #include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
 #include <drm/drm_gem_ttm_helper.h>
 #include <drm/drm_ioctl.h>
 #include <drm/drm_module.h>
@@ -52,9 +53,6 @@
 
 #define VMWGFX_DRIVER_DESC "Linux drm driver for VMware graphics devices"
 
-#define VMW_MIN_INITIAL_WIDTH 800
-#define VMW_MIN_INITIAL_HEIGHT 600
-
 /*
  * Fully encoded drm commands. Might move to vmw_drm.h
  */
@@ -265,7 +263,6 @@ static const struct pci_device_id vmw_pci_id_list[] = {
 };
 MODULE_DEVICE_TABLE(pci, vmw_pci_id_list);
 
-static int enable_fbdev = IS_ENABLED(CONFIG_DRM_VMWGFX_FBCON);
 static int vmw_restrict_iommu;
 static int vmw_force_coherent;
 static int vmw_restrict_dma_mask;
@@ -275,8 +272,6 @@ static int vmw_probe(struct pci_dev *, const struct pci_device_id *);
 static int vmwgfx_pm_notifier(struct notifier_block *nb, unsigned long val,
 			      void *ptr);
 
-MODULE_PARM_DESC(enable_fbdev, "Enable vmwgfx fbdev");
-module_param_named(enable_fbdev, enable_fbdev, int, 0600);
 MODULE_PARM_DESC(restrict_iommu, "Try to limit IOMMU usage for TTM pages");
 module_param_named(restrict_iommu, vmw_restrict_iommu, int, 0600);
 MODULE_PARM_DESC(force_coherent, "Force coherent TTM pages");
@@ -626,8 +621,8 @@ static void vmw_get_initial_size(struct vmw_private *dev_priv)
 	width = vmw_read(dev_priv, SVGA_REG_WIDTH);
 	height = vmw_read(dev_priv, SVGA_REG_HEIGHT);
 
-	width = max_t(uint32_t, width, VMW_MIN_INITIAL_WIDTH);
-	height = max_t(uint32_t, height, VMW_MIN_INITIAL_HEIGHT);
+	width = max_t(uint32_t, width, VMWGFX_MIN_INITIAL_WIDTH);
+	height = max_t(uint32_t, height, VMWGFX_MIN_INITIAL_HEIGHT);
 
 	if (width > dev_priv->fb_max_width ||
 	    height > dev_priv->fb_max_height) {
@@ -636,8 +631,8 @@ static void vmw_get_initial_size(struct vmw_private *dev_priv)
 		 * This is a host error and shouldn't occur.
 		 */
 
-		width = VMW_MIN_INITIAL_WIDTH;
-		height = VMW_MIN_INITIAL_HEIGHT;
+		width  = VMWGFX_MIN_INITIAL_WIDTH;
+		height = VMWGFX_MIN_INITIAL_HEIGHT;
 	}
 
 	dev_priv->initial_width = width;
@@ -886,9 +881,6 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 
 	dev_priv->assume_16bpp = !!vmw_assume_16bpp;
 
-	dev_priv->enable_fb = enable_fbdev;
-
-
 	dev_priv->capabilities = vmw_read(dev_priv, SVGA_REG_CAPABILITIES);
 	vmw_print_bitmap(&dev_priv->drm, "Capabilities",
 			 dev_priv->capabilities,
@@ -1135,12 +1127,6 @@ static int vmw_driver_load(struct vmw_private *dev_priv, u32 pci_id)
 			VMWGFX_DRIVER_PATCHLEVEL, UTS_RELEASE);
 	vmw_write_driver_id(dev_priv);
 
-	if (dev_priv->enable_fb) {
-		vmw_fifo_resource_inc(dev_priv);
-		vmw_svga_enable(dev_priv);
-		vmw_fb_init(dev_priv);
-	}
-
 	dev_priv->pm_nb.notifier_call = vmwgfx_pm_notifier;
 	register_pm_notifier(&dev_priv->pm_nb);
 
@@ -1187,12 +1173,9 @@ static void vmw_driver_unload(struct drm_device *dev)
 	unregister_pm_notifier(&dev_priv->pm_nb);
 
 	vmw_sw_context_fini(dev_priv);
-	if (dev_priv->enable_fb) {
-		vmw_fb_off(dev_priv);
-		vmw_fb_close(dev_priv);
-		vmw_fifo_resource_dec(dev_priv);
-		vmw_svga_disable(dev_priv);
-	}
+	vmw_fifo_resource_dec(dev_priv);
+
+	vmw_svga_disable(dev_priv);
 
 	vmw_kms_close(dev_priv);
 	vmw_overlay_close(dev_priv);
@@ -1330,8 +1313,6 @@ static void vmw_master_drop(struct drm_device *dev,
 	struct vmw_private *dev_priv = vmw_priv(dev);
 
 	vmw_kms_legacy_hotspot_clear(dev_priv);
-	if (!dev_priv->enable_fb)
-		vmw_svga_disable(dev_priv);
 }
 
 /**
@@ -1524,25 +1505,19 @@ static int vmw_pm_freeze(struct device *kdev)
 		DRM_ERROR("Failed to freeze modesetting.\n");
 		return ret;
 	}
-	if (dev_priv->enable_fb)
-		vmw_fb_off(dev_priv);
 
 	vmw_execbuf_release_pinned_bo(dev_priv);
 	vmw_resource_evict_all(dev_priv);
 	vmw_release_device_early(dev_priv);
 	while (ttm_device_swapout(&dev_priv->bdev, &ctx, GFP_KERNEL) > 0);
-	if (dev_priv->enable_fb)
-		vmw_fifo_resource_dec(dev_priv);
+	vmw_fifo_resource_dec(dev_priv);
 	if (atomic_read(&dev_priv->num_fifo_resources) != 0) {
 		DRM_ERROR("Can't hibernate while 3D resources are active.\n");
-		if (dev_priv->enable_fb)
-			vmw_fifo_resource_inc(dev_priv);
+		vmw_fifo_resource_inc(dev_priv);
 		WARN_ON(vmw_request_device_late(dev_priv));
 		dev_priv->suspend_locked = false;
 		if (dev_priv->suspend_state)
 			vmw_kms_resume(dev);
-		if (dev_priv->enable_fb)
-			vmw_fb_on(dev_priv);
 		return -EBUSY;
 	}
 
@@ -1562,24 +1537,19 @@ static int vmw_pm_restore(struct device *kdev)
 
 	vmw_detect_version(dev_priv);
 
-	if (dev_priv->enable_fb)
-		vmw_fifo_resource_inc(dev_priv);
+	vmw_fifo_resource_inc(dev_priv);
 
 	ret = vmw_request_device(dev_priv);
 	if (ret)
 		return ret;
 
-	if (dev_priv->enable_fb)
-		__vmw_svga_enable(dev_priv);
+	__vmw_svga_enable(dev_priv);
 
 	vmw_fence_fifo_up(dev_priv->fman);
 	dev_priv->suspend_locked = false;
 	if (dev_priv->suspend_state)
 		vmw_kms_resume(&dev_priv->drm);
 
-	if (dev_priv->enable_fb)
-		vmw_fb_on(dev_priv);
-
 	return 0;
 }
 
@@ -1670,6 +1640,10 @@ static int vmw_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret)
 		goto out_unload;
 
+	vmw_fifo_resource_inc(vmw);
+	vmw_svga_enable(vmw);
+	drm_fbdev_generic_setup(&vmw->drm,  0);
+
 	vmw_debugfs_gem_init(vmw);
 	vmw_debugfs_resource_managers_init(vmw);