bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)

1 files changed, 200 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0724-dma-buf-heaps-Add-system-heap-to-dmabuf-heaps.patch b/target/linux/bcm27xx/patches-5.4/950-0724-dma-buf-heaps-Add-system-heap-to-dmabuf-heaps.patch
new file mode 100644
index 0000000000..55c2450821
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0724-dma-buf-heaps-Add-system-heap-to-dmabuf-heaps.patch
@@ -0,0 +1,200 @@
+From 8392cd87592f31737286ea16f11781a234de3564 Mon Sep 17 00:00:00 2001
+From: John Stultz <john.stultz@linaro.org>
+Date: Tue, 3 Dec 2019 17:26:39 +0000
+Subject: [PATCH] dma-buf: heaps: Add system heap to dmabuf heaps
+
+Commit efa04fefebbd724ffda7f49e42d057a7217c45b0 upstream.
+
+This patch adds system heap to the dma-buf heaps framework.
+
+This allows applications to get a page-allocator backed dma-buf
+for non-contiguous memory.
+
+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/20191203172641.66642-4-john.stultz@linaro.org
+---
+ drivers/dma-buf/Kconfig             |   2 +
+ drivers/dma-buf/heaps/Kconfig       |   6 ++
+ drivers/dma-buf/heaps/Makefile      |   1 +
+ drivers/dma-buf/heaps/system_heap.c | 123 ++++++++++++++++++++++++++++
+ 4 files changed, 132 insertions(+)
+ create mode 100644 drivers/dma-buf/heaps/Kconfig
+ create mode 100644 drivers/dma-buf/heaps/system_heap.c
+
+--- a/drivers/dma-buf/Kconfig
++++ b/drivers/dma-buf/Kconfig
+@@ -53,4 +53,6 @@ menuconfig DMABUF_HEAPS
+ 	  allows userspace to allocate dma-bufs that can be shared
+ 	  between drivers.
+ 
++source "drivers/dma-buf/heaps/Kconfig"
++
+ endmenu
+--- /dev/null
++++ b/drivers/dma-buf/heaps/Kconfig
+@@ -0,0 +1,6 @@
++config DMABUF_HEAPS_SYSTEM
++	bool "DMA-BUF System Heap"
++	depends on DMABUF_HEAPS
++	help
++	  Choose this option to enable the system dmabuf heap. The system heap
++	  is backed by pages from the buddy allocator. If in doubt, say Y.
+--- a/drivers/dma-buf/heaps/Makefile
++++ b/drivers/dma-buf/heaps/Makefile
+@@ -1,2 +1,3 @@
+ # SPDX-License-Identifier: GPL-2.0
+ obj-y					+= heap-helpers.o
++obj-$(CONFIG_DMABUF_HEAPS_SYSTEM)	+= system_heap.o
+--- /dev/null
++++ b/drivers/dma-buf/heaps/system_heap.c
+@@ -0,0 +1,123 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * DMABUF System heap exporter
++ *
++ * Copyright (C) 2011 Google, Inc.
++ * Copyright (C) 2019 Linaro Ltd.
++ */
++
++#include <linux/dma-buf.h>
++#include <linux/dma-mapping.h>
++#include <linux/dma-heap.h>
++#include <linux/err.h>
++#include <linux/highmem.h>
++#include <linux/mm.h>
++#include <linux/module.h>
++#include <linux/scatterlist.h>
++#include <linux/slab.h>
++#include <linux/sched/signal.h>
++#include <asm/page.h>
++
++#include "heap-helpers.h"
++
++struct dma_heap *sys_heap;
++
++static void system_heap_free(struct heap_helper_buffer *buffer)
++{
++	pgoff_t pg;
++
++	for (pg = 0; pg < buffer->pagecount; pg++)
++		__free_page(buffer->pages[pg]);
++	kfree(buffer->pages);
++	kfree(buffer);
++}
++
++static int system_heap_allocate(struct dma_heap *heap,
++				unsigned long len,
++				unsigned long fd_flags,
++				unsigned long heap_flags)
++{
++	struct heap_helper_buffer *helper_buffer;
++	struct dma_buf *dmabuf;
++	int ret = -ENOMEM;
++	pgoff_t pg;
++
++	helper_buffer = kzalloc(sizeof(*helper_buffer), GFP_KERNEL);
++	if (!helper_buffer)
++		return -ENOMEM;
++
++	init_heap_helper_buffer(helper_buffer, system_heap_free);
++	helper_buffer->heap = heap;
++	helper_buffer->size = len;
++
++	helper_buffer->pagecount = len / PAGE_SIZE;
++	helper_buffer->pages = kmalloc_array(helper_buffer->pagecount,
++					     sizeof(*helper_buffer->pages),
++					     GFP_KERNEL);
++	if (!helper_buffer->pages) {
++		ret = -ENOMEM;
++		goto err0;
++	}
++
++	for (pg = 0; pg < helper_buffer->pagecount; pg++) {
++		/*
++		 * Avoid trying to allocate memory if the process
++		 * has been killed by by SIGKILL
++		 */
++		if (fatal_signal_pending(current))
++			goto err1;
++
++		helper_buffer->pages[pg] = alloc_page(GFP_KERNEL | __GFP_ZERO);
++		if (!helper_buffer->pages[pg])
++			goto err1;
++	}
++
++	/* create the dmabuf */
++	dmabuf = heap_helper_export_dmabuf(helper_buffer, fd_flags);
++	if (IS_ERR(dmabuf)) {
++		ret = PTR_ERR(dmabuf);
++		goto err1;
++	}
++
++	helper_buffer->dmabuf = dmabuf;
++
++	ret = dma_buf_fd(dmabuf, fd_flags);
++	if (ret < 0) {
++		dma_buf_put(dmabuf);
++		/* just return, as put will call release and that will free */
++		return ret;
++	}
++
++	return ret;
++
++err1:
++	while (pg > 0)
++		__free_page(helper_buffer->pages[--pg]);
++	kfree(helper_buffer->pages);
++err0:
++	kfree(helper_buffer);
++
++	return ret;
++}
++
++static const struct dma_heap_ops system_heap_ops = {
++	.allocate = system_heap_allocate,
++};
++
++static int system_heap_create(void)
++{
++	struct dma_heap_export_info exp_info;
++	int ret = 0;
++
++	exp_info.name = "system_heap";
++	exp_info.ops = &system_heap_ops;
++	exp_info.priv = NULL;
++
++	sys_heap = dma_heap_add(&exp_info);
++	if (IS_ERR(sys_heap))
++		ret = PTR_ERR(sys_heap);
++
++	return ret;
++}
++module_init(system_heap_create);
++MODULE_LICENSE("GPL v2");