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-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch525
1 files changed, 525 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch b/target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch
new file mode 100644
index 0000000000..f60d402379
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch
@@ -0,0 +1,525 @@
+From 4c5a9a5db543b5fd998fbc3e15fd4a2d2a3971a9 Mon Sep 17 00:00:00 2001
+From: "Andrew F. Davis" <afd@ti.com>
+Date: Tue, 3 Dec 2019 17:26:37 +0000
+Subject: [PATCH] dma-buf: Add dma-buf heaps framework
+
+Commit c02a81fba74fe3488ad6b08bfb5a1329005418f8 upstream.
+This framework allows a unified userspace interface for dma-buf
+exporters, allowing userland to allocate specific types of memory
+for use in dma-buf sharing.
+
+Each heap is given its own device node, which a user can allocate
+a dma-buf fd from using the DMA_HEAP_IOC_ALLOC.
+
+This code is an evoluiton of the Android ION implementation,
+and a big thanks is due to its authors/maintainers over time
+for their effort:
+ Rebecca Schultz Zavin, Colin Cross, Benjamin Gaignard,
+ Laura Abbott, and many other contributors!
+
+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: Brian Starkey <brian.starkey@arm.com>
+Acked-by: Sandeep Patil <sspatil@android.com>
+Signed-off-by: Andrew F. Davis <afd@ti.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/20191203172641.66642-2-john.stultz@linaro.org
+---
+ MAINTAINERS | 18 +++
+ drivers/dma-buf/Kconfig | 9 ++
+ drivers/dma-buf/Makefile | 1 +
+ drivers/dma-buf/dma-heap.c | 297 ++++++++++++++++++++++++++++++++++
+ include/linux/dma-heap.h | 59 +++++++
+ include/uapi/linux/dma-heap.h | 53 ++++++
+ 6 files changed, 437 insertions(+)
+ create mode 100644 drivers/dma-buf/dma-heap.c
+ create mode 100644 include/linux/dma-heap.h
+ create mode 100644 include/uapi/linux/dma-heap.h
+
+--- a/MAINTAINERS
++++ b/MAINTAINERS
+@@ -4963,6 +4963,24 @@ F: include/linux/*fence.h
+ F: Documentation/driver-api/dma-buf.rst
+ T: git git://anongit.freedesktop.org/drm/drm-misc
+
++DMA-BUF HEAPS FRAMEWORK
++M: Sumit Semwal <sumit.semwal@linaro.org>
++R: Andrew F. Davis <afd@ti.com>
++R: Benjamin Gaignard <benjamin.gaignard@linaro.org>
++R: Liam Mark <lmark@codeaurora.org>
++R: Laura Abbott <labbott@redhat.com>
++R: Brian Starkey <Brian.Starkey@arm.com>
++R: John Stultz <john.stultz@linaro.org>
++S: Maintained
++L: linux-media@vger.kernel.org
++L: dri-devel@lists.freedesktop.org
++L: linaro-mm-sig@lists.linaro.org (moderated for non-subscribers)
++F: include/uapi/linux/dma-heap.h
++F: include/linux/dma-heap.h
++F: drivers/dma-buf/dma-heap.c
++F: drivers/dma-buf/heaps/*
++T: git git://anongit.freedesktop.org/drm/drm-misc
++
+ DMA GENERIC OFFLOAD ENGINE SUBSYSTEM
+ M: Vinod Koul <vkoul@kernel.org>
+ L: dmaengine@vger.kernel.org
+--- a/drivers/dma-buf/Kconfig
++++ b/drivers/dma-buf/Kconfig
+@@ -44,4 +44,13 @@ config DMABUF_SELFTESTS
+ default n
+ depends on DMA_SHARED_BUFFER
+
++menuconfig DMABUF_HEAPS
++ bool "DMA-BUF Userland Memory Heaps"
++ select DMA_SHARED_BUFFER
++ help
++ Choose this option to enable the DMA-BUF userland memory heaps.
++ This options creates per heap chardevs in /dev/dma_heap/ which
++ allows userspace to allocate dma-bufs that can be shared
++ between drivers.
++
+ endmenu
+--- a/drivers/dma-buf/Makefile
++++ b/drivers/dma-buf/Makefile
+@@ -3,6 +3,7 @@ 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
+ 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/dma-heap.c
+@@ -0,0 +1,297 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * Framework for userspace DMA-BUF allocations
++ *
++ * Copyright (C) 2011 Google, Inc.
++ * Copyright (C) 2019 Linaro Ltd.
++ */
++
++#include <linux/cdev.h>
++#include <linux/debugfs.h>
++#include <linux/device.h>
++#include <linux/dma-buf.h>
++#include <linux/err.h>
++#include <linux/xarray.h>
++#include <linux/list.h>
++#include <linux/slab.h>
++#include <linux/uaccess.h>
++#include <linux/syscalls.h>
++#include <linux/dma-heap.h>
++#include <uapi/linux/dma-heap.h>
++
++#define DEVNAME "dma_heap"
++
++#define NUM_HEAP_MINORS 128
++
++/**
++ * struct dma_heap - represents a dmabuf heap in the system
++ * @name: used for debugging/device-node name
++ * @ops: ops struct for this heap
++ * @heap_devt heap device node
++ * @list list head connecting to list of heaps
++ * @heap_cdev heap char device
++ *
++ * Represents a heap of memory from which buffers can be made.
++ */
++struct dma_heap {
++ const char *name;
++ const struct dma_heap_ops *ops;
++ void *priv;
++ dev_t heap_devt;
++ struct list_head list;
++ struct cdev heap_cdev;
++};
++
++static LIST_HEAD(heap_list);
++static DEFINE_MUTEX(heap_list_lock);
++static dev_t dma_heap_devt;
++static struct class *dma_heap_class;
++static DEFINE_XARRAY_ALLOC(dma_heap_minors);
++
++static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
++ unsigned int fd_flags,
++ unsigned int heap_flags)
++{
++ /*
++ * Allocations from all heaps have to begin
++ * and end on page boundaries.
++ */
++ len = PAGE_ALIGN(len);
++ if (!len)
++ return -EINVAL;
++
++ return heap->ops->allocate(heap, len, fd_flags, heap_flags);
++}
++
++static int dma_heap_open(struct inode *inode, struct file *file)
++{
++ struct dma_heap *heap;
++
++ heap = xa_load(&dma_heap_minors, iminor(inode));
++ if (!heap) {
++ pr_err("dma_heap: minor %d unknown.\n", iminor(inode));
++ return -ENODEV;
++ }
++
++ /* instance data as context */
++ file->private_data = heap;
++ nonseekable_open(inode, file);
++
++ return 0;
++}
++
++static long dma_heap_ioctl_allocate(struct file *file, void *data)
++{
++ struct dma_heap_allocation_data *heap_allocation = data;
++ struct dma_heap *heap = file->private_data;
++ int fd;
++
++ if (heap_allocation->fd)
++ return -EINVAL;
++
++ if (heap_allocation->fd_flags & ~DMA_HEAP_VALID_FD_FLAGS)
++ return -EINVAL;
++
++ if (heap_allocation->heap_flags & ~DMA_HEAP_VALID_HEAP_FLAGS)
++ return -EINVAL;
++
++ fd = dma_heap_buffer_alloc(heap, heap_allocation->len,
++ heap_allocation->fd_flags,
++ heap_allocation->heap_flags);
++ if (fd < 0)
++ return fd;
++
++ heap_allocation->fd = fd;
++
++ return 0;
++}
++
++unsigned int dma_heap_ioctl_cmds[] = {
++ DMA_HEAP_IOC_ALLOC,
++};
++
++static long dma_heap_ioctl(struct file *file, unsigned int ucmd,
++ unsigned long arg)
++{
++ char stack_kdata[128];
++ char *kdata = stack_kdata;
++ unsigned int kcmd;
++ unsigned int in_size, out_size, drv_size, ksize;
++ int nr = _IOC_NR(ucmd);
++ int ret = 0;
++
++ if (nr >= ARRAY_SIZE(dma_heap_ioctl_cmds))
++ return -EINVAL;
++
++ /* Get the kernel ioctl cmd that matches */
++ kcmd = dma_heap_ioctl_cmds[nr];
++
++ /* Figure out the delta between user cmd size and kernel cmd size */
++ drv_size = _IOC_SIZE(kcmd);
++ out_size = _IOC_SIZE(ucmd);
++ in_size = out_size;
++ if ((ucmd & kcmd & IOC_IN) == 0)
++ in_size = 0;
++ if ((ucmd & kcmd & IOC_OUT) == 0)
++ out_size = 0;
++ ksize = max(max(in_size, out_size), drv_size);
++
++ /* If necessary, allocate buffer for ioctl argument */
++ if (ksize > sizeof(stack_kdata)) {
++ kdata = kmalloc(ksize, GFP_KERNEL);
++ if (!kdata)
++ return -ENOMEM;
++ }
++
++ if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
++ ret = -EFAULT;
++ goto err;
++ }
++
++ /* zero out any difference between the kernel/user structure size */
++ if (ksize > in_size)
++ memset(kdata + in_size, 0, ksize - in_size);
++
++ switch (kcmd) {
++ case DMA_HEAP_IOC_ALLOC:
++ ret = dma_heap_ioctl_allocate(file, kdata);
++ break;
++ default:
++ return -ENOTTY;
++ }
++
++ if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
++ ret = -EFAULT;
++err:
++ if (kdata != stack_kdata)
++ kfree(kdata);
++ return ret;
++}
++
++static const struct file_operations dma_heap_fops = {
++ .owner = THIS_MODULE,
++ .open = dma_heap_open,
++ .unlocked_ioctl = dma_heap_ioctl,
++#ifdef CONFIG_COMPAT
++ .compat_ioctl = dma_heap_ioctl,
++#endif
++};
++
++/**
++ * dma_heap_get_drvdata() - get per-subdriver data for the heap
++ * @heap: DMA-Heap to retrieve private data for
++ *
++ * Returns:
++ * The per-subdriver data for the heap.
++ */
++void *dma_heap_get_drvdata(struct dma_heap *heap)
++{
++ return heap->priv;
++}
++
++struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
++{
++ struct dma_heap *heap, *h, *err_ret;
++ struct device *dev_ret;
++ unsigned int minor;
++ int ret;
++
++ if (!exp_info->name || !strcmp(exp_info->name, "")) {
++ pr_err("dma_heap: Cannot add heap without a name\n");
++ return ERR_PTR(-EINVAL);
++ }
++
++ if (!exp_info->ops || !exp_info->ops->allocate) {
++ pr_err("dma_heap: Cannot add heap with invalid ops struct\n");
++ return ERR_PTR(-EINVAL);
++ }
++
++ /* check the name is unique */
++ mutex_lock(&heap_list_lock);
++ list_for_each_entry(h, &heap_list, list) {
++ if (!strcmp(h->name, exp_info->name)) {
++ mutex_unlock(&heap_list_lock);
++ pr_err("dma_heap: Already registered heap named %s\n",
++ exp_info->name);
++ return ERR_PTR(-EINVAL);
++ }
++ }
++ mutex_unlock(&heap_list_lock);
++
++ heap = kzalloc(sizeof(*heap), GFP_KERNEL);
++ if (!heap)
++ return ERR_PTR(-ENOMEM);
++
++ heap->name = exp_info->name;
++ heap->ops = exp_info->ops;
++ heap->priv = exp_info->priv;
++
++ /* Find unused minor number */
++ ret = xa_alloc(&dma_heap_minors, &minor, heap,
++ XA_LIMIT(0, NUM_HEAP_MINORS - 1), GFP_KERNEL);
++ if (ret < 0) {
++ pr_err("dma_heap: Unable to get minor number for heap\n");
++ err_ret = ERR_PTR(ret);
++ goto err0;
++ }
++
++ /* Create device */
++ heap->heap_devt = MKDEV(MAJOR(dma_heap_devt), minor);
++
++ cdev_init(&heap->heap_cdev, &dma_heap_fops);
++ ret = cdev_add(&heap->heap_cdev, heap->heap_devt, 1);
++ if (ret < 0) {
++ pr_err("dma_heap: Unable to add char device\n");
++ err_ret = ERR_PTR(ret);
++ goto err1;
++ }
++
++ dev_ret = device_create(dma_heap_class,
++ NULL,
++ heap->heap_devt,
++ NULL,
++ heap->name);
++ if (IS_ERR(dev_ret)) {
++ pr_err("dma_heap: Unable to create device\n");
++ err_ret = ERR_CAST(dev_ret);
++ goto err2;
++ }
++ /* Add heap to the list */
++ mutex_lock(&heap_list_lock);
++ list_add(&heap->list, &heap_list);
++ mutex_unlock(&heap_list_lock);
++
++ return heap;
++
++err2:
++ cdev_del(&heap->heap_cdev);
++err1:
++ xa_erase(&dma_heap_minors, minor);
++err0:
++ kfree(heap);
++ return err_ret;
++}
++
++static char *dma_heap_devnode(struct device *dev, umode_t *mode)
++{
++ return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));
++}
++
++static int dma_heap_init(void)
++{
++ int ret;
++
++ ret = alloc_chrdev_region(&dma_heap_devt, 0, NUM_HEAP_MINORS, DEVNAME);
++ if (ret)
++ return ret;
++
++ dma_heap_class = class_create(THIS_MODULE, DEVNAME);
++ if (IS_ERR(dma_heap_class)) {
++ unregister_chrdev_region(dma_heap_devt, NUM_HEAP_MINORS);
++ return PTR_ERR(dma_heap_class);
++ }
++ dma_heap_class->devnode = dma_heap_devnode;
++
++ return 0;
++}
++subsys_initcall(dma_heap_init);
+--- /dev/null
++++ b/include/linux/dma-heap.h
+@@ -0,0 +1,59 @@
++/* SPDX-License-Identifier: GPL-2.0 */
++/*
++ * DMABUF Heaps Allocation Infrastructure
++ *
++ * Copyright (C) 2011 Google, Inc.
++ * Copyright (C) 2019 Linaro Ltd.
++ */
++
++#ifndef _DMA_HEAPS_H
++#define _DMA_HEAPS_H
++
++#include <linux/cdev.h>
++#include <linux/types.h>
++
++struct dma_heap;
++
++/**
++ * struct dma_heap_ops - ops to operate on a given heap
++ * @allocate: allocate dmabuf and return fd
++ *
++ * allocate returns dmabuf fd on success, -errno on error.
++ */
++struct dma_heap_ops {
++ int (*allocate)(struct dma_heap *heap,
++ unsigned long len,
++ unsigned long fd_flags,
++ unsigned long heap_flags);
++};
++
++/**
++ * struct dma_heap_export_info - information needed to export a new dmabuf heap
++ * @name: used for debugging/device-node name
++ * @ops: ops struct for this heap
++ * @priv: heap exporter private data
++ *
++ * Information needed to export a new dmabuf heap.
++ */
++struct dma_heap_export_info {
++ const char *name;
++ const struct dma_heap_ops *ops;
++ void *priv;
++};
++
++/**
++ * dma_heap_get_drvdata() - get per-heap driver data
++ * @heap: DMA-Heap to retrieve private data for
++ *
++ * Returns:
++ * The per-heap data for the heap.
++ */
++void *dma_heap_get_drvdata(struct dma_heap *heap);
++
++/**
++ * dma_heap_add - adds a heap to dmabuf heaps
++ * @exp_info: information needed to register this heap
++ */
++struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
++
++#endif /* _DMA_HEAPS_H */
+--- /dev/null
++++ b/include/uapi/linux/dma-heap.h
+@@ -0,0 +1,53 @@
++/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
++/*
++ * DMABUF Heaps Userspace API
++ *
++ * Copyright (C) 2011 Google, Inc.
++ * Copyright (C) 2019 Linaro Ltd.
++ */
++#ifndef _UAPI_LINUX_DMABUF_POOL_H
++#define _UAPI_LINUX_DMABUF_POOL_H
++
++#include <linux/ioctl.h>
++#include <linux/types.h>
++
++/**
++ * DOC: DMABUF Heaps Userspace API
++ */
++
++/* Valid FD_FLAGS are O_CLOEXEC, O_RDONLY, O_WRONLY, O_RDWR */
++#define DMA_HEAP_VALID_FD_FLAGS (O_CLOEXEC | O_ACCMODE)
++
++/* Currently no heap flags */
++#define DMA_HEAP_VALID_HEAP_FLAGS (0)
++
++/**
++ * struct dma_heap_allocation_data - metadata passed from userspace for
++ * allocations
++ * @len: size of the allocation
++ * @fd: will be populated with a fd which provides the
++ * handle to the allocated dma-buf
++ * @fd_flags: file descriptor flags used when allocating
++ * @heap_flags: flags passed to heap
++ *
++ * Provided by userspace as an argument to the ioctl
++ */
++struct dma_heap_allocation_data {
++ __u64 len;
++ __u32 fd;
++ __u32 fd_flags;
++ __u64 heap_flags;
++};
++
++#define DMA_HEAP_IOC_MAGIC 'H'
++
++/**
++ * DOC: DMA_HEAP_IOC_ALLOC - allocate memory from pool
++ *
++ * Takes a dma_heap_allocation_data struct and returns it with the fd field
++ * populated with the dmabuf handle of the allocation.
++ */
++#define DMA_HEAP_IOC_ALLOC _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,\
++ struct dma_heap_allocation_data)
++
++#endif /* _UAPI_LINUX_DMABUF_POOL_H */