drm/gma500: Split GTT init/resume/fini into GTT and GEM functions

The GTT init, fini and resume functions contain both, GTT and GEM,
code. Split each into a separate GTT and a GEM function. The GEM
code is responsible for mmap_mutex and the stolen memory area. The
rest of the functionality is left in GTT functions.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220308195222.13471-9-tzimmermann@suse.de

drivers/gpu/drm/gma500/gtt.c

@@ -125,19 +125,26 @@ void psb_gtt_remove_pages(struct drm_psb_private *pdev, const struct resource *r
 	mutex_unlock(&pdev->gtt_mutex);
 }
 
+void psb_gem_mm_fini(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+
+	iounmap(dev_priv->vram_addr);
+
+	mutex_destroy(&dev_priv->mmap_mutex);
+}
+
 void psb_gtt_fini(struct drm_device *dev)
 {
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
 
-	iounmap(dev_priv->vram_addr);
 	iounmap(dev_priv->gtt_map);
 
 	pci_write_config_word(pdev, PSB_GMCH_CTRL, dev_priv->gmch_ctrl);
 	PSB_WVDC32(dev_priv->pge_ctl, PSB_PGETBL_CTL);
 	(void)PSB_RVDC32(PSB_PGETBL_CTL);
 
-	mutex_destroy(&dev_priv->mmap_mutex);
 	mutex_destroy(&dev_priv->gtt_mutex);
 }
 
@@ -211,12 +218,10 @@ int psb_gtt_init(struct drm_device *dev)
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	unsigned gtt_pages;
-	unsigned long stolen_size, vram_stolen_size;
 	struct psb_gtt *pg;
 	int ret = 0;
 
 	mutex_init(&dev_priv->gtt_mutex);
-	mutex_init(&dev_priv->mmap_mutex);
 
 	pg = &dev_priv->gtt;
 
@@ -274,49 +279,63 @@ int psb_gtt_init(struct drm_device *dev)
 		dev_priv->gtt_mem = &fudge;
 	}
 
+	pg->gtt_pages = gtt_pages;
+
+	dev_priv->gtt_map = ioremap(pg->gtt_phys_start, gtt_pages << PAGE_SHIFT);
+	if (!dev_priv->gtt_map) {
+		dev_err(dev->dev, "Failure to map gtt.\n");
+		ret = -ENOMEM;
+		goto err_gtt_disable;
+	}
+
+	psb_gtt_clear(dev_priv);
+
+	return 0;
+
+err_gtt_disable:
+	pci_write_config_word(pdev, PSB_GMCH_CTRL, dev_priv->gmch_ctrl);
+	PSB_WVDC32(dev_priv->pge_ctl, PSB_PGETBL_CTL);
+	(void)PSB_RVDC32(PSB_PGETBL_CTL);
+	mutex_destroy(&dev_priv->gtt_mutex);
+	return ret;
+}
+
+int psb_gem_mm_init(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	unsigned long stolen_size, vram_stolen_size;
+	struct psb_gtt *pg;
+	int ret;
+
+	mutex_init(&dev_priv->mmap_mutex);
+
+	pg = &dev_priv->gtt;
+
 	pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
-	vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base
-								- PAGE_SIZE;
+	vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;
 
 	stolen_size = vram_stolen_size;
 
 	dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n",
 		dev_priv->stolen_base, vram_stolen_size / 1024);
 
-	pg->gtt_pages = gtt_pages;
 	pg->stolen_size = stolen_size;
 	dev_priv->vram_stolen_size = vram_stolen_size;
 
-	/*
-	 *	Map the GTT and the stolen memory area
-	 */
-	dev_priv->gtt_map = ioremap(pg->gtt_phys_start, gtt_pages << PAGE_SHIFT);
-	if (!dev_priv->gtt_map) {
-		dev_err(dev->dev, "Failure to map gtt.\n");
-		ret = -ENOMEM;
-		goto err_gtt_disable;
-	}
-
 	dev_priv->vram_addr = ioremap_wc(dev_priv->stolen_base, stolen_size);
 	if (!dev_priv->vram_addr) {
 		dev_err(dev->dev, "Failure to map stolen base.\n");
 		ret = -ENOMEM;
-		goto err_iounmap;
+		goto err_mutex_destroy;
 	}
 
-	psb_gtt_clear(dev_priv);
 	psb_gtt_populate_stolen(dev_priv);
 
 	return 0;
 
-err_iounmap:
-	iounmap(dev_priv->gtt_map);
-err_gtt_disable:
-	pci_write_config_word(pdev, PSB_GMCH_CTRL, dev_priv->gmch_ctrl);
-	PSB_WVDC32(dev_priv->pge_ctl, PSB_PGETBL_CTL);
-	(void)PSB_RVDC32(PSB_PGETBL_CTL);
+err_mutex_destroy:
 	mutex_destroy(&dev_priv->mmap_mutex);
-	mutex_destroy(&dev_priv->gtt_mutex);
 	return ret;
 }
 
@@ -325,9 +344,8 @@ static int psb_gtt_resume(struct drm_device *dev)
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	unsigned int gtt_pages;
-	unsigned long stolen_size, vram_stolen_size;
 	struct psb_gtt *pg;
-	int ret = 0;
+	int ret;
 
 	pg = &dev_priv->gtt;
 
@@ -387,27 +405,15 @@ static int psb_gtt_resume(struct drm_device *dev)
 		dev_priv->gtt_mem = &fudge;
 	}
 
-	pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
-	vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;
-	stolen_size = vram_stolen_size;
-
-	dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n",
-			dev_priv->stolen_base, vram_stolen_size / 1024);
-
-	if ((gtt_pages != pg->gtt_pages) && (stolen_size != pg->stolen_size)) {
+	if (gtt_pages != pg->gtt_pages) {
 		dev_err(dev->dev, "GTT resume error.\n");
 		ret = -EINVAL;
 		goto err_gtt_disable;
 	}
 
 	pg->gtt_pages = gtt_pages;
-	pg->stolen_size = stolen_size;
-	dev_priv->vram_stolen_size = vram_stolen_size;
 
 	psb_gtt_clear(dev_priv);
-	psb_gtt_populate_stolen(dev_priv);
-
-	return 0;
 
 err_gtt_disable:
 	pci_write_config_word(pdev, PSB_GMCH_CTRL, dev_priv->gmch_ctrl);
@@ -416,11 +422,39 @@ static int psb_gtt_resume(struct drm_device *dev)
 	return ret;
 }
 
+static int psb_gem_mm_resume(struct drm_device *dev)
+{
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+	struct pci_dev *pdev = to_pci_dev(dev->dev);
+	unsigned long stolen_size, vram_stolen_size;
+	struct psb_gtt *pg;
+
+	pg = &dev_priv->gtt;
+
+	pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
+	vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;
+
+	stolen_size = vram_stolen_size;
+
+	dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n", dev_priv->stolen_base,
+		vram_stolen_size / 1024);
+
+	if (stolen_size != pg->stolen_size) {
+		dev_err(dev->dev, "GTT resume error.\n");
+		return -EINVAL;
+	}
+
+	psb_gtt_populate_stolen(dev_priv);
+
+	return 0;
+}
+
 int psb_gtt_restore(struct drm_device *dev)
 {
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 
 	psb_gtt_resume(dev);
+	psb_gem_mm_resume(dev);
 
 	psb_gtt_populate_resources(dev_priv);
 

drivers/gpu/drm/gma500/gtt.h

@@ -37,4 +37,7 @@ void psb_gtt_insert_pages(struct drm_psb_private *pdev, const struct resource *r
 			  struct page **pages);
 void psb_gtt_remove_pages(struct drm_psb_private *pdev, const struct resource *res);
 
+int psb_gem_mm_init(struct drm_device *dev);
+void psb_gem_mm_fini(struct drm_device *dev);
+
 #endif

drivers/gpu/drm/gma500/psb_drv.c

@@ -192,6 +192,7 @@ static void psb_driver_unload(struct drm_device *dev)
 		psb_mmu_driver_takedown(dev_priv->mmu);
 		dev_priv->mmu = NULL;
 	}
+	psb_gem_mm_fini(dev);
 	psb_gtt_fini(dev);
 	if (dev_priv->scratch_page) {
 		set_pages_wb(dev_priv->scratch_page, 1);
@@ -325,6 +326,9 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
 	set_pages_uc(dev_priv->scratch_page, 1);
 
 	ret = psb_gtt_init(dev);
+	if (ret)
+		goto out_err;
+	ret = psb_gem_mm_init(dev);
 	if (ret)
 		goto out_err;