drm/gma500: Move helpers for struct gtt_range from gtt.c to gem.c

Allocation and pinning helpers for struct gtt_range are GEM functions,
so move them to gem.c. No functional changes.

v2:
	* keep docs for psb_gtt_{attach,detach}_pages() (Patrik)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211015084053.13708-2-tzimmermann@suse.de

7 files changed, 147 insertions, 209 deletions

diff --git a/drivers/gpu/drm/gma500/framebuffer.c b/drivers/gpu/drm/gma500/framebuffer.c
index 321e416489a9..ce92d11bd20f 100644
--- a/drivers/gpu/drm/gma500/framebuffer.c
+++ b/drivers/gpu/drm/gma500/framebuffer.c
@@ -25,7 +25,6 @@
 
 #include "framebuffer.h"
 #include "gem.h"
-#include "gtt.h"
 #include "psb_drv.h"
 #include "psb_intel_drv.h"
 #include "psb_intel_reg.h"
diff --git a/drivers/gpu/drm/gma500/gem.c b/drivers/gpu/drm/gma500/gem.c
index 5ae54c9d2819..a41990dbcc0e 100644
--- a/drivers/gpu/drm/gma500/gem.c
+++ b/drivers/gpu/drm/gma500/gem.c
@@ -19,6 +19,100 @@
 #include "gem.h"
 #include "psb_drv.h"
 
+/*
+ * Pin and build an in-kernel list of the pages that back our GEM object.
+ * While we hold this the pages cannot be swapped out. This is protected
+ * via the gtt mutex which the caller must hold.
+ */
+static int psb_gtt_attach_pages(struct gtt_range *gt)
+{
+	struct page **pages;
+
+	WARN_ON(gt->pages);
+
+	pages = drm_gem_get_pages(&gt->gem);
+	if (IS_ERR(pages))
+		return PTR_ERR(pages);
+
+	gt->npage = gt->gem.size / PAGE_SIZE;
+	gt->pages = pages;
+
+	return 0;
+}
+
+/*
+ * Undo the effect of psb_gtt_attach_pages. At this point the pages
+ * must have been removed from the GTT as they could now be paged out
+ * and move bus address. This is protected via the gtt mutex which the
+ * caller must hold.
+ */
+static void psb_gtt_detach_pages(struct gtt_range *gt)
+{
+	drm_gem_put_pages(&gt->gem, gt->pages, true, false);
+	gt->pages = NULL;
+}
+
+int psb_gtt_pin(struct gtt_range *gt)
+{
+	int ret = 0;
+	struct drm_device *dev = gt->gem.dev;
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+	u32 gpu_base = dev_priv->gtt.gatt_start;
+
+	mutex_lock(&dev_priv->gtt_mutex);
+
+	if (gt->in_gart == 0 && gt->stolen == 0) {
+		ret = psb_gtt_attach_pages(gt);
+		if (ret < 0)
+			goto out;
+		ret = psb_gtt_insert(dev, gt, 0);
+		if (ret < 0) {
+			psb_gtt_detach_pages(gt);
+			goto out;
+		}
+		psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu),
+				     gt->pages, (gpu_base + gt->offset),
+				     gt->npage, 0, 0, PSB_MMU_CACHED_MEMORY);
+	}
+	gt->in_gart++;
+out:
+	mutex_unlock(&dev_priv->gtt_mutex);
+	return ret;
+}
+
+void psb_gtt_unpin(struct gtt_range *gt)
+{
+	struct drm_device *dev = gt->gem.dev;
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+	u32 gpu_base = dev_priv->gtt.gatt_start;
+
+	mutex_lock(&dev_priv->gtt_mutex);
+
+	WARN_ON(!gt->in_gart);
+
+	gt->in_gart--;
+	if (gt->in_gart == 0 && gt->stolen == 0) {
+		psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
+				     (gpu_base + gt->offset), gt->npage, 0, 0);
+		psb_gtt_remove(dev, gt);
+		psb_gtt_detach_pages(gt);
+	}
+
+	mutex_unlock(&dev_priv->gtt_mutex);
+}
+
+void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
+{
+	/* Undo the mmap pin if we are destroying the object */
+	if (gt->mmapping) {
+		psb_gtt_unpin(gt);
+		gt->mmapping = 0;
+	}
+	WARN_ON(gt->in_gart && !gt->stolen);
+	release_resource(&gt->resource);
+	kfree(gt);
+}
+
 static vm_fault_t psb_gem_fault(struct vm_fault *vmf);
 
 static void psb_gem_free_object(struct drm_gem_object *obj)
@@ -44,19 +138,43 @@ const struct drm_gem_object_funcs psb_gem_object_funcs = {
 	.vm_ops = &psb_gem_vm_ops,
 };
 
-/**
- *	psb_gem_create		-	create a mappable object
- *	@file: the DRM file of the client
- *	@dev: our device
- *	@size: the size requested
- *	@handlep: returned handle (opaque number)
- *	@stolen: unused
- *	@align: unused
- *
- *	Create a GEM object, fill in the boilerplate and attach a handle to
- *	it so that userspace can speak about it. This does the core work
- *	for the various methods that do/will create GEM objects for things
- */
+struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
+				      const char *name, int backed, u32 align)
+{
+	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+	struct gtt_range *gt;
+	struct resource *r = dev_priv->gtt_mem;
+	int ret;
+	unsigned long start, end;
+
+	if (backed) {
+		/* The start of the GTT is the stolen pages */
+		start = r->start;
+		end = r->start + dev_priv->gtt.stolen_size - 1;
+	} else {
+		/* The rest we will use for GEM backed objects */
+		start = r->start + dev_priv->gtt.stolen_size;
+		end = r->end;
+	}
+
+	gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL);
+	if (gt == NULL)
+		return NULL;
+	gt->resource.name = name;
+	gt->stolen = backed;
+	gt->in_gart = backed;
+	/* Ensure this is set for non GEM objects */
+	gt->gem.dev = dev;
+	ret = allocate_resource(dev_priv->gtt_mem, &gt->resource,
+				len, start, end, align, NULL, NULL);
+	if (ret == 0) {
+		gt->offset = gt->resource.start - r->start;
+		return gt;
+	}
+	kfree(gt);
+	return NULL;
+}
+
 int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size,
 		   u32 *handlep, int stolen, u32 align)
 {
diff --git a/drivers/gpu/drm/gma500/gem.h b/drivers/gpu/drm/gma500/gem.h
index bae6454ead29..275494aedd4c 100644
--- a/drivers/gpu/drm/gma500/gem.h
+++ b/drivers/gpu/drm/gma500/gem.h
@@ -8,6 +8,8 @@
 #ifndef _GEM_H
 #define _GEM_H
 
+#include <drm/drm_gem.h>
+
 struct drm_device;
 
 extern const struct drm_gem_object_funcs psb_gem_object_funcs;
@@ -15,4 +17,10 @@ extern const struct drm_gem_object_funcs psb_gem_object_funcs;
 extern int psb_gem_create(struct drm_file *file, struct drm_device *dev,
 			  u64 size, u32 *handlep, int stolen, u32 align);
 
+struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len, const char *name,
+				      int backed, u32 align);
+void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt);
+int psb_gtt_pin(struct gtt_range *gt);
+void psb_gtt_unpin(struct gtt_range *gt);
+
 #endif
diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c
index cbcecbaa041b..ecf8153416ac 100644
--- a/drivers/gpu/drm/gma500/gma_display.c
+++ b/drivers/gpu/drm/gma500/gma_display.c
@@ -15,6 +15,7 @@
 #include <drm/drm_vblank.h>
 
 #include "framebuffer.h"
+#include "gem.h"
 #include "gma_display.h"
 #include "psb_drv.h"
 #include "psb_intel_drv.h"
diff --git a/drivers/gpu/drm/gma500/gtt.c b/drivers/gpu/drm/gma500/gtt.c
index 55a2a6919533..0aacf7122e32 100644
--- a/drivers/gpu/drm/gma500/gtt.c
+++ b/drivers/gpu/drm/gma500/gtt.c
@@ -71,8 +71,7 @@ static u32 __iomem *psb_gtt_entry(struct drm_device *dev, struct gtt_range *r)
  *	the GTT. This is protected via the gtt mutex which the caller
  *	must hold.
  */
-static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r,
-			  int resume)
+int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r, int resume)
 {
 	u32 __iomem *gtt_slot;
 	u32 pte;
@@ -116,7 +115,7 @@ static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r,
  *	page table entries with the dummy page. This is protected via the gtt
  *	mutex which the caller must hold.
  */
-static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
+void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
 {
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	u32 __iomem *gtt_slot;
@@ -135,191 +134,6 @@ static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
 	set_pages_array_wb(r->pages, r->npage);
 }
 
-/**
- *	psb_gtt_attach_pages	-	attach and pin GEM pages
- *	@gt: the gtt range
- *
- *	Pin and build an in kernel list of the pages that back our GEM object.
- *	While we hold this the pages cannot be swapped out. This is protected
- *	via the gtt mutex which the caller must hold.
- */
-static int psb_gtt_attach_pages(struct gtt_range *gt)
-{
-	struct page **pages;
-
-	WARN_ON(gt->pages);
-
-	pages = drm_gem_get_pages(&gt->gem);
-	if (IS_ERR(pages))
-		return PTR_ERR(pages);
-
-	gt->npage = gt->gem.size / PAGE_SIZE;
-	gt->pages = pages;
-
-	return 0;
-}
-
-/**
- *	psb_gtt_detach_pages	-	attach and pin GEM pages
- *	@gt: the gtt range
- *
- *	Undo the effect of psb_gtt_attach_pages. At this point the pages
- *	must have been removed from the GTT as they could now be paged out
- *	and move bus address. This is protected via the gtt mutex which the
- *	caller must hold.
- */
-static void psb_gtt_detach_pages(struct gtt_range *gt)
-{
-	drm_gem_put_pages(&gt->gem, gt->pages, true, false);
-	gt->pages = NULL;
-}
-
-/**
- *	psb_gtt_pin		-	pin pages into the GTT
- *	@gt: range to pin
- *
- *	Pin a set of pages into the GTT. The pins are refcounted so that
- *	multiple pins need multiple unpins to undo.
- *
- *	Non GEM backed objects treat this as a no-op as they are always GTT
- *	backed objects.
- */
-int psb_gtt_pin(struct gtt_range *gt)
-{
-	int ret = 0;
-	struct drm_device *dev = gt->gem.dev;
-	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
-	u32 gpu_base = dev_priv->gtt.gatt_start;
-
-	mutex_lock(&dev_priv->gtt_mutex);
-
-	if (gt->in_gart == 0 && gt->stolen == 0) {
-		ret = psb_gtt_attach_pages(gt);
-		if (ret < 0)
-			goto out;
-		ret = psb_gtt_insert(dev, gt, 0);
-		if (ret < 0) {
-			psb_gtt_detach_pages(gt);
-			goto out;
-		}
-		psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu),
-				     gt->pages, (gpu_base + gt->offset),
-				     gt->npage, 0, 0, PSB_MMU_CACHED_MEMORY);
-	}
-	gt->in_gart++;
-out:
-	mutex_unlock(&dev_priv->gtt_mutex);
-	return ret;
-}
-
-/**
- *	psb_gtt_unpin		-	Drop a GTT pin requirement
- *	@gt: range to pin
- *
- *	Undoes the effect of psb_gtt_pin. On the last drop the GEM object
- *	will be removed from the GTT which will also drop the page references
- *	and allow the VM to clean up or page stuff.
- *
- *	Non GEM backed objects treat this as a no-op as they are always GTT
- *	backed objects.
- */
-void psb_gtt_unpin(struct gtt_range *gt)
-{
-	struct drm_device *dev = gt->gem.dev;
-	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
-	u32 gpu_base = dev_priv->gtt.gatt_start;
-
-	mutex_lock(&dev_priv->gtt_mutex);
-
-	WARN_ON(!gt->in_gart);
-
-	gt->in_gart--;
-	if (gt->in_gart == 0 && gt->stolen == 0) {
-		psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
-				     (gpu_base + gt->offset), gt->npage, 0, 0);
-		psb_gtt_remove(dev, gt);
-		psb_gtt_detach_pages(gt);
-	}
-
-	mutex_unlock(&dev_priv->gtt_mutex);
-}
-
-/*
- *	GTT resource allocator - allocate and manage GTT address space
- */
-
-/**
- *	psb_gtt_alloc_range	-	allocate GTT address space
- *	@dev: Our DRM device
- *	@len: length (bytes) of address space required
- *	@name: resource name
- *	@backed: resource should be backed by stolen pages
- *	@align: requested alignment
- *
- *	Ask the kernel core to find us a suitable range of addresses
- *	to use for a GTT mapping.
- *
- *	Returns a gtt_range structure describing the object, or NULL on
- *	error. On successful return the resource is both allocated and marked
- *	as in use.
- */
-struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
-				      const char *name, int backed, u32 align)
-{
-	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
-	struct gtt_range *gt;
-	struct resource *r = dev_priv->gtt_mem;
-	int ret;
-	unsigned long start, end;
-
-	if (backed) {
-		/* The start of the GTT is the stolen pages */
-		start = r->start;
-		end = r->start + dev_priv->gtt.stolen_size - 1;
-	} else {
-		/* The rest we will use for GEM backed objects */
-		start = r->start + dev_priv->gtt.stolen_size;
-		end = r->end;
-	}
-
-	gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL);
-	if (gt == NULL)
-		return NULL;
-	gt->resource.name = name;
-	gt->stolen = backed;
-	gt->in_gart = backed;
-	/* Ensure this is set for non GEM objects */
-	gt->gem.dev = dev;
-	ret = allocate_resource(dev_priv->gtt_mem, &gt->resource,
-				len, start, end, align, NULL, NULL);
-	if (ret == 0) {
-		gt->offset = gt->resource.start - r->start;
-		return gt;
-	}
-	kfree(gt);
-	return NULL;
-}
-
-/**
- *	psb_gtt_free_range	-	release GTT address space
- *	@dev: our DRM device
- *	@gt: a mapping created with psb_gtt_alloc_range
- *
- *	Release a resource that was allocated with psb_gtt_alloc_range. If the
- *	object has been pinned by mmap users we clean this up here currently.
- */
-void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
-{
-	/* Undo the mmap pin if we are destroying the object */
-	if (gt->mmapping) {
-		psb_gtt_unpin(gt);
-		gt->mmapping = 0;
-	}
-	WARN_ON(gt->in_gart && !gt->stolen);
-	release_resource(&gt->resource);
-	kfree(gt);
-}
-
 static void psb_gtt_alloc(struct drm_device *dev)
 {
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
diff --git a/drivers/gpu/drm/gma500/gtt.h b/drivers/gpu/drm/gma500/gtt.h
index 2bf165849ebe..36162b545570 100644
--- a/drivers/gpu/drm/gma500/gtt.h
+++ b/drivers/gpu/drm/gma500/gtt.h
@@ -41,12 +41,9 @@ struct gtt_range {
 
 #define to_gtt_range(x) container_of(x, struct gtt_range, gem)
 
-extern struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
-					     const char *name, int backed,
-					     u32 align);
-extern void psb_gtt_kref_put(struct gtt_range *gt);
-extern void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt);
-extern int psb_gtt_pin(struct gtt_range *gt);
-extern void psb_gtt_unpin(struct gtt_range *gt);
 extern int psb_gtt_restore(struct drm_device *dev);
+
+int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r, int resume);
+void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r);
+
 #endif
diff --git a/drivers/gpu/drm/gma500/psb_intel_display.c b/drivers/gpu/drm/gma500/psb_intel_display.c
index f5f259fde88e..18d5f7e5889e 100644
--- a/drivers/gpu/drm/gma500/psb_intel_display.c
+++ b/drivers/gpu/drm/gma500/psb_intel_display.c
@@ -12,6 +12,7 @@
 #include <drm/drm_plane_helper.h>
 
 #include "framebuffer.h"
+#include "gem.h"
 #include "gma_display.h"
 #include "power.h"
 #include "psb_drv.h"