aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch')
-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch525
1 files changed, 0 insertions, 525 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
deleted file mode 100644
index f60d402379..0000000000
--- a/target/linux/bcm27xx/patches-5.4/950-0722-dma-buf-Add-dma-buf-heaps-framework.patch
+++ /dev/null
@@ -1,525 +0,0 @@
-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 */
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-03 01:07:18 +0000