Revert "dma-buf: heaps: Add heap helpers"

This reverts commit 7b87ea704fd9606eaafa9150116536d72f5c4b1f.

This patchset doesn't meet the UAPI requirements set out in [1] for the DRM
subsystem. Once the userspace component is reviewed and ready for merge
we can try again.

[1]- https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-uapi.html#open-source-userspace-requirements

Fixes: 7b87ea704fd9 ("dma-buf: heaps: Add heap helpers")
Cc: Laura Abbott <labbott@redhat.com>
Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Pratik Patel <pratikp@codeaurora.org>
Cc: Brian Starkey <Brian.Starkey@arm.com>
Cc: Vincent Donnefort <Vincent.Donnefort@arm.com>
Cc: Sudipto Paul <Sudipto.Paul@arm.com>
Cc: Andrew F. Davis <afd@ti.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Chenbo Feng <fengc@google.com>
Cc: Alistair Strachan <astrachan@google.com>
Cc: Hridya Valsaraju <hridya@google.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: dri-devel@lists.freedesktop.org
Cc: Brian Starkey <brian.starkey@arm.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: "Andrew F. Davis" <afd@ti.com>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Acked-by: David Airlie <airlied@linux.ie>
Signed-off-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20191030203003.101156-5-sean@poorly.run

3 files changed, 0 insertions, 325 deletions

diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile
deleted file mode 100644
index de49898112db..000000000000
--- a/drivers/dma-buf/heaps/Makefile
+++ /dev/null
@@ -1,2 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-obj-y					+= heap-helpers.o
diff --git a/drivers/dma-buf/heaps/heap-helpers.c b/drivers/dma-buf/heaps/heap-helpers.c
deleted file mode 100644
index 750bef4e902d..000000000000
--- a/drivers/dma-buf/heaps/heap-helpers.c
+++ /dev/null
@@ -1,268 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/device.h>
-#include <linux/dma-buf.h>
-#include <linux/err.h>
-#include <linux/highmem.h>
-#include <linux/idr.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <linux/vmalloc.h>
-#include <uapi/linux/dma-heap.h>
-
-#include "heap-helpers.h"
-
-void init_heap_helper_buffer(struct heap_helper_buffer *buffer,
-			     void (*free)(struct heap_helper_buffer *))
-{
-	buffer->priv_virt = NULL;
-	mutex_init(&buffer->lock);
-	buffer->vmap_cnt = 0;
-	buffer->vaddr = NULL;
-	buffer->pagecount = 0;
-	buffer->pages = NULL;
-	INIT_LIST_HEAD(&buffer->attachments);
-	buffer->free = free;
-}
-
-struct dma_buf *heap_helper_export_dmabuf(struct heap_helper_buffer *buffer,
-					  int fd_flags)
-{
-	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
-
-	exp_info.ops = &heap_helper_ops;
-	exp_info.size = buffer->size;
-	exp_info.flags = fd_flags;
-	exp_info.priv = buffer;
-
-	return dma_buf_export(&exp_info);
-}
-
-static void *dma_heap_map_kernel(struct heap_helper_buffer *buffer)
-{
-	void *vaddr;
-
-	vaddr = vmap(buffer->pages, buffer->pagecount, VM_MAP, PAGE_KERNEL);
-	if (!vaddr)
-		return ERR_PTR(-ENOMEM);
-
-	return vaddr;
-}
-
-static void dma_heap_buffer_destroy(struct heap_helper_buffer *buffer)
-{
-	if (buffer->vmap_cnt > 0) {
-		WARN("%s: buffer still mapped in the kernel\n", __func__);
-		vunmap(buffer->vaddr);
-	}
-
-	buffer->free(buffer);
-}
-
-static void *dma_heap_buffer_vmap_get(struct heap_helper_buffer *buffer)
-{
-	void *vaddr;
-
-	if (buffer->vmap_cnt) {
-		buffer->vmap_cnt++;
-		return buffer->vaddr;
-	}
-	vaddr = dma_heap_map_kernel(buffer);
-	if (IS_ERR(vaddr))
-		return vaddr;
-	buffer->vaddr = vaddr;
-	buffer->vmap_cnt++;
-	return vaddr;
-}
-
-static void dma_heap_buffer_vmap_put(struct heap_helper_buffer *buffer)
-{
-	if (!--buffer->vmap_cnt) {
-		vunmap(buffer->vaddr);
-		buffer->vaddr = NULL;
-	}
-}
-
-struct dma_heaps_attachment {
-	struct device *dev;
-	struct sg_table table;
-	struct list_head list;
-};
-
-static int dma_heap_attach(struct dma_buf *dmabuf,
-			   struct dma_buf_attachment *attachment)
-{
-	struct dma_heaps_attachment *a;
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-	int ret;
-
-	a = kzalloc(sizeof(*a), GFP_KERNEL);
-	if (!a)
-		return -ENOMEM;
-
-	ret = sg_alloc_table_from_pages(&a->table, buffer->pages,
-					buffer->pagecount, 0,
-					buffer->pagecount << PAGE_SHIFT,
-					GFP_KERNEL);
-	if (ret) {
-		kfree(a);
-		return ret;
-	}
-
-	a->dev = attachment->dev;
-	INIT_LIST_HEAD(&a->list);
-
-	attachment->priv = a;
-
-	mutex_lock(&buffer->lock);
-	list_add(&a->list, &buffer->attachments);
-	mutex_unlock(&buffer->lock);
-
-	return 0;
-}
-
-static void dma_heap_detach(struct dma_buf *dmabuf,
-			    struct dma_buf_attachment *attachment)
-{
-	struct dma_heaps_attachment *a = attachment->priv;
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-
-	mutex_lock(&buffer->lock);
-	list_del(&a->list);
-	mutex_unlock(&buffer->lock);
-
-	sg_free_table(&a->table);
-	kfree(a);
-}
-
-static
-struct sg_table *dma_heap_map_dma_buf(struct dma_buf_attachment *attachment,
-				      enum dma_data_direction direction)
-{
-	struct dma_heaps_attachment *a = attachment->priv;
-	struct sg_table *table;
-
-	table = &a->table;
-
-	if (!dma_map_sg(attachment->dev, table->sgl, table->nents,
-			direction))
-		table = ERR_PTR(-ENOMEM);
-	return table;
-}
-
-static void dma_heap_unmap_dma_buf(struct dma_buf_attachment *attachment,
-				   struct sg_table *table,
-				   enum dma_data_direction direction)
-{
-	dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction);
-}
-
-static vm_fault_t dma_heap_vm_fault(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-	struct heap_helper_buffer *buffer = vma->vm_private_data;
-
-	vmf->page = buffer->pages[vmf->pgoff];
-	get_page(vmf->page);
-
-	return 0;
-}
-
-static const struct vm_operations_struct dma_heap_vm_ops = {
-	.fault = dma_heap_vm_fault,
-};
-
-static int dma_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
-{
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-
-	if ((vma->vm_flags & (VM_SHARED | VM_MAYSHARE)) == 0)
-		return -EINVAL;
-
-	vma->vm_ops = &dma_heap_vm_ops;
-	vma->vm_private_data = buffer;
-
-	return 0;
-}
-
-static void dma_heap_dma_buf_release(struct dma_buf *dmabuf)
-{
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-
-	dma_heap_buffer_destroy(buffer);
-}
-
-static int dma_heap_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
-					     enum dma_data_direction direction)
-{
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-	struct dma_heaps_attachment *a;
-	int ret = 0;
-
-	mutex_lock(&buffer->lock);
-
-	if (buffer->vmap_cnt)
-		invalidate_kernel_vmap_range(buffer->vaddr, buffer->size);
-
-	list_for_each_entry(a, &buffer->attachments, list) {
-		dma_sync_sg_for_cpu(a->dev, a->table.sgl, a->table.nents,
-				    direction);
-	}
-	mutex_unlock(&buffer->lock);
-
-	return ret;
-}
-
-static int dma_heap_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
-					   enum dma_data_direction direction)
-{
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-	struct dma_heaps_attachment *a;
-
-	mutex_lock(&buffer->lock);
-
-	if (buffer->vmap_cnt)
-		flush_kernel_vmap_range(buffer->vaddr, buffer->size);
-
-	list_for_each_entry(a, &buffer->attachments, list) {
-		dma_sync_sg_for_device(a->dev, a->table.sgl, a->table.nents,
-				       direction);
-	}
-	mutex_unlock(&buffer->lock);
-
-	return 0;
-}
-
-static void *dma_heap_dma_buf_vmap(struct dma_buf *dmabuf)
-{
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-	void *vaddr;
-
-	mutex_lock(&buffer->lock);
-	vaddr = dma_heap_buffer_vmap_get(buffer);
-	mutex_unlock(&buffer->lock);
-
-	return vaddr;
-}
-
-static void dma_heap_dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr)
-{
-	struct heap_helper_buffer *buffer = dmabuf->priv;
-
-	mutex_lock(&buffer->lock);
-	dma_heap_buffer_vmap_put(buffer);
-	mutex_unlock(&buffer->lock);
-}
-
-const struct dma_buf_ops heap_helper_ops = {
-	.map_dma_buf = dma_heap_map_dma_buf,
-	.unmap_dma_buf = dma_heap_unmap_dma_buf,
-	.mmap = dma_heap_mmap,
-	.release = dma_heap_dma_buf_release,
-	.attach = dma_heap_attach,
-	.detach = dma_heap_detach,
-	.begin_cpu_access = dma_heap_dma_buf_begin_cpu_access,
-	.end_cpu_access = dma_heap_dma_buf_end_cpu_access,
-	.vmap = dma_heap_dma_buf_vmap,
-	.vunmap = dma_heap_dma_buf_vunmap,
-};
diff --git a/drivers/dma-buf/heaps/heap-helpers.h b/drivers/dma-buf/heaps/heap-helpers.h
deleted file mode 100644
index 911c931f7f06..000000000000
--- a/drivers/dma-buf/heaps/heap-helpers.h
+++ /dev/null
@@ -1,55 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * DMABUF Heaps helper code
- *
- * Copyright (C) 2011 Google, Inc.
- * Copyright (C) 2019 Linaro Ltd.
- */
-
-#ifndef _HEAP_HELPERS_H
-#define _HEAP_HELPERS_H
-
-#include <linux/dma-heap.h>
-#include <linux/list.h>
-
-/**
- * struct heap_helper_buffer - helper buffer metadata
- * @heap:		back pointer to the heap the buffer came from
- * @dmabuf:		backing dma-buf for this buffer
- * @size:		size of the buffer
- * @flags:		buffer specific flags
- * @priv_virt		pointer to heap specific private value
- * @lock		mutext to protect the data in this structure
- * @vmap_cnt		count of vmap references on the buffer
- * @vaddr		vmap'ed virtual address
- * @pagecount		number of pages in the buffer
- * @pages		list of page pointers
- * @attachments		list of device attachments
- *
- * @free		heap callback to free the buffer
- */
-struct heap_helper_buffer {
-	struct dma_heap *heap;
-	struct dma_buf *dmabuf;
-	size_t size;
-	unsigned long flags;
-
-	void *priv_virt;
-	struct mutex lock;
-	int vmap_cnt;
-	void *vaddr;
-	pgoff_t pagecount;
-	struct page **pages;
-	struct list_head attachments;
-
-	void (*free)(struct heap_helper_buffer *buffer);
-};
-
-void init_heap_helper_buffer(struct heap_helper_buffer *buffer,
-			     void (*free)(struct heap_helper_buffer *));
-
-struct dma_buf *heap_helper_export_dmabuf(struct heap_helper_buffer *buffer,
-					  int fd_flags);
-
-extern const struct dma_buf_ops heap_helper_ops;
-#endif /* _HEAP_HELPERS_H */