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-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0731-dma-buf-heaps-Add-heap-helpers.patch394
1 files changed, 394 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0731-dma-buf-heaps-Add-heap-helpers.patch b/target/linux/bcm27xx/patches-5.4/950-0731-dma-buf-heaps-Add-heap-helpers.patch
new file mode 100644
index 0000000000..10eb46ca7b
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0731-dma-buf-heaps-Add-heap-helpers.patch
@@ -0,0 +1,394 @@
+From adde2d6532428cdcaeb60081abb299ce6e5aa76b Mon Sep 17 00:00:00 2001
+From: John Stultz <john.stultz@linaro.org>
+Date: Tue, 3 Dec 2019 17:26:38 +0000
+Subject: [PATCH] dma-buf: heaps: Add heap helpers
+
+Commit 5248eb12fea890a03b4cdc3ef546d6319d4d9b73 upstream.
+
+Add generic helper dmabuf ops for dma heaps, so we can reduce
+the amount of duplicative code for the exported dmabufs.
+
+This code is an evolution of the Android ION implementation, so
+thanks to its original authors and maintainters:
+ Rebecca Schultz Zavin, Colin Cross, Laura Abbott, and others!
+
+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: Sandeep Patil <sspatil@google.com>
+Cc: Hillf Danton <hdanton@sina.com>
+Cc: Dave Airlie <airlied@gmail.com>
+Cc: dri-devel@lists.freedesktop.org
+Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
+Reviewed-by: Brian Starkey <brian.starkey@arm.com>
+Acked-by: Sandeep Patil <sspatil@android.com>
+Acked-by: Laura Abbott <labbott@redhat.com>
+Tested-by: Ayan Kumar Halder <ayan.halder@arm.com>
+Signed-off-by: John Stultz <john.stultz@linaro.org>
+Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
+Link: https://patchwork.freedesktop.org/patch/msgid/20191203172641.66642-3-john.stultz@linaro.org
+---
+ drivers/dma-buf/Makefile | 1 +
+ drivers/dma-buf/heaps/Makefile | 2 +
+ drivers/dma-buf/heaps/heap-helpers.c | 271 +++++++++++++++++++++++++++
+ drivers/dma-buf/heaps/heap-helpers.h | 53 ++++++
+ 4 files changed, 327 insertions(+)
+ create mode 100644 drivers/dma-buf/heaps/Makefile
+ create mode 100644 drivers/dma-buf/heaps/heap-helpers.c
+ create mode 100644 drivers/dma-buf/heaps/heap-helpers.h
+
+--- a/drivers/dma-buf/Makefile
++++ b/drivers/dma-buf/Makefile
+@@ -4,6 +4,7 @@ obj-$(CONFIG_DMA_SHARED_BUFFER) := dma-s
+ dma-buf-objs-y := dma-buf.o dma-fence.o dma-fence-array.o dma-fence-chain.o \
+ dma-resv.o seqno-fence.o
+ obj-$(CONFIG_DMABUF_HEAPS) += dma-heap.o
++obj-$(CONFIG_DMABUF_HEAPS) += heaps/
+ dma-buf-objs-$(CONFIG_SYNC_FILE) += sync_file.o
+ dma-buf-objs-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o
+ dma-buf-objs-$(CONFIG_UDMABUF) += udmabuf.o
+--- /dev/null
++++ b/drivers/dma-buf/heaps/Makefile
+@@ -0,0 +1,2 @@
++# SPDX-License-Identifier: GPL-2.0
++obj-y += heap-helpers.o
+--- /dev/null
++++ b/drivers/dma-buf/heaps/heap-helpers.c
+@@ -0,0 +1,271 @@
++// 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(1, "%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;
++
++ if (vmf->pgoff > buffer->pagecount)
++ return VM_FAULT_SIGBUS;
++
++ 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,
++};
+--- /dev/null
++++ b/drivers/dma-buf/heaps/heap-helpers.h
+@@ -0,0 +1,53 @@
++/* 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
++ * @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;
++
++ 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 */
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