* [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION)
@ 2019-12-03 17:26 John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework John Stultz
` (4 more replies)
0 siblings, 5 replies; 10+ messages in thread
From: John Stultz @ 2019-12-03 17:26 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Laura Abbott, Benjamin Gaignard, Sumit Semwal,
Liam Mark, Pratik Patel, Brian Starkey, Vincent Donnefort,
Sudipto Paul, Andrew F . Davis, Christoph Hellwig, Chenbo Feng,
Alistair Strachan, Hridya Valsaraju, Sandeep Patil, Hillf Danton,
Dave Airlie, dri-devel
Just wanted to resend v16.
This patchset implements per-heap devices which can be opened
directly and then an ioctl is used to allocate a dmabuf from the
heap.
The interface is similar, but much simpler then IONs, only
providing an ALLOC ioctl.
Also, I've provided relatively simple system and cma heaps.
I've booted and tested these patches with AOSP on the HiKey960
using the kernel tree here:
https://git.linaro.org/people/john.stultz/android-dev.git/log/?h=dev/dma-buf-heap
And the reviewed (+2'ed) userspace changes here:
https://android-review.googlesource.com/c/device/linaro/hikey/+/909436
Compared to ION, this patchset is missing the system-contig,
carveout and chunk heaps, as I don't have a device that uses
those, so I'm unable to do much useful validation there.
Additionally we have no upstream users of chunk or carveout,
and the system-contig has been deprecated in the common/andoid-*
kernels, so this should be ok.
I've also removed the stats accounting, since any such
accounting should be implemented by dma-buf core or the heaps
themselves.
New in v16:
* Typo fix suggested by Hridya Valsaraju <hridya@google.com>
* Add extra error and ioctl compatibility testing suggested by
Daniel Vetter to the kselftest test
Thanks again for all the reviews and feedback!
-john
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
Andrew F. Davis (1):
dma-buf: Add dma-buf heaps framework
John Stultz (4):
dma-buf: heaps: Add heap helpers
dma-buf: heaps: Add system heap to dmabuf heaps
dma-buf: heaps: Add CMA heap to dmabuf heaps
kselftests: Add dma-heap test
MAINTAINERS | 18 +
drivers/dma-buf/Kconfig | 11 +
drivers/dma-buf/Makefile | 2 +
drivers/dma-buf/dma-heap.c | 297 +++++++++++++
drivers/dma-buf/heaps/Kconfig | 14 +
drivers/dma-buf/heaps/Makefile | 4 +
drivers/dma-buf/heaps/cma_heap.c | 177 ++++++++
drivers/dma-buf/heaps/heap-helpers.c | 271 ++++++++++++
drivers/dma-buf/heaps/heap-helpers.h | 53 +++
drivers/dma-buf/heaps/system_heap.c | 123 ++++++
include/linux/dma-heap.h | 59 +++
include/uapi/linux/dma-heap.h | 53 +++
tools/testing/selftests/dmabuf-heaps/Makefile | 6 +
.../selftests/dmabuf-heaps/dmabuf-heap.c | 396 ++++++++++++++++++
14 files changed, 1484 insertions(+)
create mode 100644 drivers/dma-buf/dma-heap.c
create mode 100644 drivers/dma-buf/heaps/Kconfig
create mode 100644 drivers/dma-buf/heaps/Makefile
create mode 100644 drivers/dma-buf/heaps/cma_heap.c
create mode 100644 drivers/dma-buf/heaps/heap-helpers.c
create mode 100644 drivers/dma-buf/heaps/heap-helpers.h
create mode 100644 drivers/dma-buf/heaps/system_heap.c
create mode 100644 include/linux/dma-heap.h
create mode 100644 include/uapi/linux/dma-heap.h
create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile
create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
--
2.17.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework
2019-12-03 17:26 [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION) John Stultz
@ 2019-12-03 17:26 ` John Stultz
2019-12-12 16:52 ` Andrew F. Davis
2019-12-03 17:26 ` [RESEND][PATCH v16 2/5] dma-buf: heaps: Add heap helpers John Stultz
` (3 subsequent siblings)
4 siblings, 1 reply; 10+ messages in thread
From: John Stultz @ 2019-12-03 17:26 UTC (permalink / raw)
To: lkml
Cc: Andrew F. Davis, Laura Abbott, Benjamin Gaignard, Sumit Semwal,
Liam Mark, Pratik Patel, Brian Starkey, Vincent Donnefort,
Sudipto Paul, Christoph Hellwig, Chenbo Feng, Alistair Strachan,
Hridya Valsaraju, Sandeep Patil, Hillf Danton, Dave Airlie,
dri-devel, John Stultz
From: "Andrew F. Davis" <afd@ti.com>
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>
---
v2:
* Folded down fixes I had previously shared in implementing
heaps
* Make flags a u64 (Suggested by Laura)
* Add PAGE_ALIGN() fix to the core alloc funciton
* IOCTL fixups suggested by Brian
* Added fixes suggested by Benjamin
* Removed core stats mgmt, as that should be implemented by
per-heap code
* Changed alloc to return a dma-buf fd, rather than a buffer
(as it simplifies error handling)
v3:
* Removed scare-quotes in MAINTAINERS email address
* Get rid of .release function as it didn't do anything (from
Christoph)
* Renamed filp to file (suggested by Christoph)
* Split out ioctl handling to separate function (suggested by
Christoph)
* Add comment documenting PAGE_ALIGN usage (suggested by Brian)
* Switch from idr to Xarray (suggested by Brian)
* Fixup cdev creation (suggested by Brian)
* Avoid EXPORT_SYMBOL until we finalize modules (suggested by
Brian)
* Make struct dma_heap internal only (folded in from Andrew)
* Small cleanups suggested by GregKH
* Provide class->devnode callback to get consistent /dev/
subdirectory naming (Suggested by Bjorn)
v4:
* Folded down dma-heap.h change that was in a following patch
* Added fd_flags entry to allocation structure and pass it
through to heap code for use on dma-buf fd creation (suggested
by Benjamin)
v5:
* Minor cleanups
v6:
* Improved error path handling, minor whitespace fixes, both
suggested by Brian
v7:
* Longer Kconfig description to quiet checkpatch warnings
* Re-add compat_ioctl bits (Hridya noticed 32bit userland wasn't
working)
v8:
* Make struct dma_heap_ops consts (Suggested by Christoph)
* Checkpatch whitespace fixups
v9:
* Minor cleanups suggested by Brian Starkey
* Rename dma_heap_get_data->dma_heap_get_drvdata suggested
by Hilf Danton
v11:
* Kconfig text improvements suggested by Randy Dunlap
v12:
* Add logic to prevent duplicately named heaps being added
* Add symbol exports for heaps as modules
v13:
* Re-remove symbol exports per discussion w/ Brian. Will
resubmit in a separte patch for review
v14:
* Reworked ioctl handler to zero fill any difference in
structure size, similar to what the DRM core does, as
suggested by Dave Airlie
* Removed now unnecessary reserved bits in allocate_data
* Added get_features ioctl as suggested by Dave Airlie
* Removed pr_warn_once messages as requested by Dave
Airlie
v15:
* Dropped the get_features ioctl as suggested by Brian
Starkey and Daniel Vetter
* Add listhead comment suggested by Sandeep Patil
* Dropped minor value in struct dma_heap as suggested by
Sandeep Patil
* Fix grammar typo from Brian Starkey
v16:
* Typo fix suggested by Hridya Valsaraju <hridya@google.com>
---
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
diff --git a/MAINTAINERS b/MAINTAINERS
index 8608724835dd..44b7cbc0ec29 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4971,6 +4971,24 @@ 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
diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
index a23b6752d11a..bffa58fc3e6e 100644
--- 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
diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile
index 03479da06422..caee5eb3d351 100644
--- a/drivers/dma-buf/Makefile
+++ b/drivers/dma-buf/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-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_SYNC_FILE) += sync_file.o
obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o
obj-$(CONFIG_UDMABUF) += udmabuf.o
diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
new file mode 100644
index 000000000000..4f04d104ae61
--- /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);
diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
new file mode 100644
index 000000000000..454e354d1ffb
--- /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 */
diff --git a/include/uapi/linux/dma-heap.h b/include/uapi/linux/dma-heap.h
new file mode 100644
index 000000000000..73e7f66c1cae
--- /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 */
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [RESEND][PATCH v16 2/5] dma-buf: heaps: Add heap helpers
2019-12-03 17:26 [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION) John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework John Stultz
@ 2019-12-03 17:26 ` John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps John Stultz
` (2 subsequent siblings)
4 siblings, 0 replies; 10+ messages in thread
From: John Stultz @ 2019-12-03 17:26 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Laura Abbott, Benjamin Gaignard, Sumit Semwal,
Liam Mark, Pratik Patel, Brian Starkey, Vincent Donnefort,
Sudipto Paul, Andrew F . Davis, Christoph Hellwig, Chenbo Feng,
Alistair Strachan, Hridya Valsaraju, Sandeep Patil, Hillf Danton,
Dave Airlie, dri-devel
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>
---
v2:
* Removed cache management performance hack that I had
accidentally folded in.
* Removed stats code that was in helpers
* Lots of checkpatch cleanups
v3:
* Uninline INIT_HEAP_HELPER_BUFFER (suggested by Christoph)
* Switch to WARN on buffer destroy failure (suggested by Brian)
* buffer->kmap_cnt decrementing cleanup (suggested by Christoph)
* Extra buffer->vaddr checking in dma_heap_dma_buf_kmap
(suggested by Brian)
* Switch to_helper_buffer from macro to inline function
(suggested by Benjamin)
* Rename kmap->vmap (folded in from Andrew)
* Use vmap for vmapping - not begin_cpu_access (folded in from
Andrew)
* Drop kmap for now, as its optional (folded in from Andrew)
* Fold dma_heap_map_user into the single caller (foled in from
Andrew)
* Folded in patch from Andrew to track page list per heap not
sglist, which simplifies the tracking logic
v4:
* Moved dma-heap.h change out to previous patch
v6:
* Minor cleanups and typo fixes suggested by Brian
v7:
* Removed stray ;
* Make init_heap_helper_buffer lowercase, as suggested by Christoph
* Add dmabuf export helper to reduce boilerplate code
v8:
* Remove unused private_flags value
* Condense dma_heap_buffer and heap_helper_buffer (suggested by
Christoph)
* Fix indentation by using shorter argument names (suggested by
Christoph)
* Add flush_kernel_vmap_range/invalidate_kernel_vmap_range calls
(suggested by Christoph)
* Checkpatch whitespace fixups
v9:
* Minor cleanups suggested by Brian Starkey
v10:
* Fix missing vmalloc.h inclusion in heap helpers (found by
kbuild test robot <lkp@intel.com>)
v12:
* Add symbol exports for heaps as modules
v13:
* Re-remove symbol exports, per discussion with Brian, as I'll
resubmit the change for review independently.
v14:
* Fix missing argment to WARN() in dma_heap_buffer_destroy()
found and fixed by Dan Carpenter <dan.carpenter@oracle.com>
* Add check in fault hanlder that pgoff isn't larger then
pagecount, reported by Dan Carpenter
v15:
* Drop unused flags field from heap_helper_buffer as suggested
by Sandeep Patil
---
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
diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile
index caee5eb3d351..9c190026bfab 100644
--- a/drivers/dma-buf/Makefile
+++ b/drivers/dma-buf/Makefile
@@ -2,6 +2,7 @@
obj-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/
obj-$(CONFIG_SYNC_FILE) += sync_file.o
obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o
obj-$(CONFIG_UDMABUF) += udmabuf.o
diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile
new file mode 100644
index 000000000000..de49898112db
--- /dev/null
+++ b/drivers/dma-buf/heaps/Makefile
@@ -0,0 +1,2 @@
+# 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
new file mode 100644
index 000000000000..9f964ca3f59c
--- /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,
+};
diff --git a/drivers/dma-buf/heaps/heap-helpers.h b/drivers/dma-buf/heaps/heap-helpers.h
new file mode 100644
index 000000000000..805d2df88024
--- /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 */
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps
2019-12-03 17:26 [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION) John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 2/5] dma-buf: heaps: Add heap helpers John Stultz
@ 2019-12-03 17:26 ` John Stultz
2019-12-12 16:20 ` Andrew F. Davis
2019-12-03 17:26 ` [RESEND][PATCH v16 4/5] dma-buf: heaps: Add CMA " John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 5/5] kselftests: Add dma-heap test John Stultz
4 siblings, 1 reply; 10+ messages in thread
From: John Stultz @ 2019-12-03 17:26 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Laura Abbott, Benjamin Gaignard, Sumit Semwal,
Liam Mark, Pratik Patel, Brian Starkey, Vincent Donnefort,
Sudipto Paul, Andrew F . Davis, Christoph Hellwig, Chenbo Feng,
Alistair Strachan, Hridya Valsaraju, Sandeep Patil, Hillf Danton,
Dave Airlie, dri-devel
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>
---
v2:
* Switch allocate to return dmabuf fd
* Simplify init code
* Checkpatch fixups
* Droped dead system-contig code
v3:
* Whitespace fixups from Benjamin
* Make sure we're zeroing the allocated pages (from Liam)
* Use PAGE_ALIGN() consistently (suggested by Brian)
* Fold in new registration style from Andrew
* Avoid needless dynamic allocation of sys_heap (suggested by
Christoph)
* Minor cleanups
* Folded in changes from Andrew to use simplified page list
from the heap helpers
v4:
* Optimization to allocate pages in chunks, similar to old
pagepool code
* Use fd_flags when creating dmabuf fd (Suggested by Benjamin)
v5:
* Back out large order page allocations (was leaking memory,
as the page array didn't properly track order size)
v6:
* Minor whitespace change suggested by Brian
* Remove unused variable
v7:
* Use newly lower-cased init_heap_helper_buffer helper
* Add system heap DOS avoidance suggested by Laura from ION code
* Use new dmabuf export helper
v8:
* Make struct dma_heap_ops consts (suggested by Christoph)
* Get rid of needless struct system_heap (suggested by Christoph)
* Condense dma_heap_buffer and heap_helper_buffer (suggested by
Christoph)
* Add forgotten include file to fix build issue on x86
v12:
* Minor tweaks to prep loading heap from module
v14:
* Fix "redundant assignment to variable ret" issue reported
by Colin King and fixed by Andrew Davis
v15:
* Drop unused heap flag from heap_helper_buffer as suggested
by Sandeep Patil
---
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
diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
index bffa58fc3e6e..0613bb7770f5 100644
--- 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
diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig
new file mode 100644
index 000000000000..205052744169
--- /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.
diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile
index de49898112db..d1808eca2581 100644
--- 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
diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
new file mode 100644
index 000000000000..1aa01e98c595
--- /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");
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [RESEND][PATCH v16 4/5] dma-buf: heaps: Add CMA heap to dmabuf heaps
2019-12-03 17:26 [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION) John Stultz
` (2 preceding siblings ...)
2019-12-03 17:26 ` [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps John Stultz
@ 2019-12-03 17:26 ` John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 5/5] kselftests: Add dma-heap test John Stultz
4 siblings, 0 replies; 10+ messages in thread
From: John Stultz @ 2019-12-03 17:26 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Laura Abbott, Benjamin Gaignard, Sumit Semwal,
Liam Mark, Pratik Patel, Brian Starkey, Vincent Donnefort,
Sudipto Paul, Andrew F . Davis, Christoph Hellwig, Chenbo Feng,
Alistair Strachan, Hridya Valsaraju, Sandeep Patil, Hillf Danton,
Dave Airlie, dri-devel
This adds a CMA heap, which allows userspace to allocate
a dma-buf of contiguous memory out of a CMA region.
This code is an evolution of the Android ION implementation, so
thanks to its original author and maintainters:
Benjamin Gaignard, Laura Abbott, and others!
NOTE: This patch only adds the default CMA heap. We will enable
selectively adding other CMA memory regions to the dmabuf heaps
interface with a later patch (which requires a dt binding)
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>
---
v2:
* Switch allocate to return dmabuf fd
* Simplify init code
* Checkpatch fixups
v3:
* Switch to inline function for to_cma_heap()
* Minor cleanups suggested by Brian
* Fold in new registration style from Andrew
* Folded in changes from Andrew to use simplified page list
from the heap helpers
v4:
* Use the fd_flags when creating dmabuf fd (Suggested by
Benjamin)
* Use precalculated pagecount (Suggested by Andrew)
v6:
* Changed variable names to improve clarity, as suggested
by Brian
v7:
* Use newly lower-cased init_heap_helper_buffer helper
* Use new dmabuf export helper
v8:
* Make struct dma_heap_ops const (Suggested by Christoph)
* Condense dma_heap_buffer and heap_helper_buffer (suggested by
Christoph)
* Checkpatch whitespace fixups
v9:
* Removing needless check noted by Brian Starkey
* Rename dma_heap_get_data->dma_heap_get_drvdata suggested
by Hilf Danton
* Check signals after clearing memory pages to avoid doing
needless work if the task is killed as suggested by Hilf
v12:
* Rework to only add the default CMA heap
v15:
* Drop unused flags field from heap_helper_buffer as suggested
by Sandeep Patil
---
drivers/dma-buf/heaps/Kconfig | 8 ++
drivers/dma-buf/heaps/Makefile | 1 +
drivers/dma-buf/heaps/cma_heap.c | 177 +++++++++++++++++++++++++++++++
3 files changed, 186 insertions(+)
create mode 100644 drivers/dma-buf/heaps/cma_heap.c
diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig
index 205052744169..a5eef06c4226 100644
--- a/drivers/dma-buf/heaps/Kconfig
+++ b/drivers/dma-buf/heaps/Kconfig
@@ -4,3 +4,11 @@ config DMABUF_HEAPS_SYSTEM
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.
+
+config DMABUF_HEAPS_CMA
+ bool "DMA-BUF CMA Heap"
+ depends on DMABUF_HEAPS && DMA_CMA
+ help
+ Choose this option to enable dma-buf CMA heap. This heap is backed
+ by the Contiguous Memory Allocator (CMA). If your system has these
+ regions, you should say Y here.
diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile
index d1808eca2581..6e54cdec3da0 100644
--- a/drivers/dma-buf/heaps/Makefile
+++ b/drivers/dma-buf/heaps/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += heap-helpers.o
obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o
+obj-$(CONFIG_DMABUF_HEAPS_CMA) += cma_heap.o
diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
new file mode 100644
index 000000000000..626cf7fd033a
--- /dev/null
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DMABUF CMA heap exporter
+ *
+ * Copyright (C) 2012, 2019 Linaro Ltd.
+ * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
+ */
+
+#include <linux/cma.h>
+#include <linux/device.h>
+#include <linux/dma-buf.h>
+#include <linux/dma-heap.h>
+#include <linux/dma-contiguous.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/highmem.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/scatterlist.h>
+#include <linux/sched/signal.h>
+
+#include "heap-helpers.h"
+
+struct cma_heap {
+ struct dma_heap *heap;
+ struct cma *cma;
+};
+
+static void cma_heap_free(struct heap_helper_buffer *buffer)
+{
+ struct cma_heap *cma_heap = dma_heap_get_drvdata(buffer->heap);
+ unsigned long nr_pages = buffer->pagecount;
+ struct page *cma_pages = buffer->priv_virt;
+
+ /* free page list */
+ kfree(buffer->pages);
+ /* release memory */
+ cma_release(cma_heap->cma, cma_pages, nr_pages);
+ kfree(buffer);
+}
+
+/* dmabuf heap CMA operations functions */
+static int cma_heap_allocate(struct dma_heap *heap,
+ unsigned long len,
+ unsigned long fd_flags,
+ unsigned long heap_flags)
+{
+ struct cma_heap *cma_heap = dma_heap_get_drvdata(heap);
+ struct heap_helper_buffer *helper_buffer;
+ struct page *cma_pages;
+ size_t size = PAGE_ALIGN(len);
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+ unsigned long align = get_order(size);
+ struct dma_buf *dmabuf;
+ int ret = -ENOMEM;
+ pgoff_t pg;
+
+ if (align > CONFIG_CMA_ALIGNMENT)
+ align = CONFIG_CMA_ALIGNMENT;
+
+ helper_buffer = kzalloc(sizeof(*helper_buffer), GFP_KERNEL);
+ if (!helper_buffer)
+ return -ENOMEM;
+
+ init_heap_helper_buffer(helper_buffer, cma_heap_free);
+ helper_buffer->heap = heap;
+ helper_buffer->size = len;
+
+ cma_pages = cma_alloc(cma_heap->cma, nr_pages, align, false);
+ if (!cma_pages)
+ goto free_buf;
+
+ if (PageHighMem(cma_pages)) {
+ unsigned long nr_clear_pages = nr_pages;
+ struct page *page = cma_pages;
+
+ while (nr_clear_pages > 0) {
+ void *vaddr = kmap_atomic(page);
+
+ memset(vaddr, 0, PAGE_SIZE);
+ kunmap_atomic(vaddr);
+ /*
+ * Avoid wasting time zeroing memory if the process
+ * has been killed by by SIGKILL
+ */
+ if (fatal_signal_pending(current))
+ goto free_cma;
+
+ page++;
+ nr_clear_pages--;
+ }
+ } else {
+ memset(page_address(cma_pages), 0, size);
+ }
+
+ helper_buffer->pagecount = nr_pages;
+ helper_buffer->pages = kmalloc_array(helper_buffer->pagecount,
+ sizeof(*helper_buffer->pages),
+ GFP_KERNEL);
+ if (!helper_buffer->pages) {
+ ret = -ENOMEM;
+ goto free_cma;
+ }
+
+ for (pg = 0; pg < helper_buffer->pagecount; pg++)
+ helper_buffer->pages[pg] = &cma_pages[pg];
+
+ /* create the dmabuf */
+ dmabuf = heap_helper_export_dmabuf(helper_buffer, fd_flags);
+ if (IS_ERR(dmabuf)) {
+ ret = PTR_ERR(dmabuf);
+ goto free_pages;
+ }
+
+ helper_buffer->dmabuf = dmabuf;
+ helper_buffer->priv_virt = cma_pages;
+
+ 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;
+
+free_pages:
+ kfree(helper_buffer->pages);
+free_cma:
+ cma_release(cma_heap->cma, cma_pages, nr_pages);
+free_buf:
+ kfree(helper_buffer);
+ return ret;
+}
+
+static const struct dma_heap_ops cma_heap_ops = {
+ .allocate = cma_heap_allocate,
+};
+
+static int __add_cma_heap(struct cma *cma, void *data)
+{
+ struct cma_heap *cma_heap;
+ struct dma_heap_export_info exp_info;
+
+ cma_heap = kzalloc(sizeof(*cma_heap), GFP_KERNEL);
+ if (!cma_heap)
+ return -ENOMEM;
+ cma_heap->cma = cma;
+
+ exp_info.name = cma_get_name(cma);
+ exp_info.ops = &cma_heap_ops;
+ exp_info.priv = cma_heap;
+
+ cma_heap->heap = dma_heap_add(&exp_info);
+ if (IS_ERR(cma_heap->heap)) {
+ int ret = PTR_ERR(cma_heap->heap);
+
+ kfree(cma_heap);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int add_default_cma_heap(void)
+{
+ struct cma *default_cma = dev_get_cma_area(NULL);
+ int ret = 0;
+
+ if (default_cma)
+ ret = __add_cma_heap(default_cma, NULL);
+
+ return ret;
+}
+module_init(add_default_cma_heap);
+MODULE_DESCRIPTION("DMA-BUF CMA Heap");
+MODULE_LICENSE("GPL v2");
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread
* [RESEND][PATCH v16 5/5] kselftests: Add dma-heap test
2019-12-03 17:26 [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION) John Stultz
` (3 preceding siblings ...)
2019-12-03 17:26 ` [RESEND][PATCH v16 4/5] dma-buf: heaps: Add CMA " John Stultz
@ 2019-12-03 17:26 ` John Stultz
4 siblings, 0 replies; 10+ messages in thread
From: John Stultz @ 2019-12-03 17:26 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Benjamin Gaignard, Sumit Semwal, Liam Mark,
Pratik Patel, Brian Starkey, Vincent Donnefort, Sudipto Paul,
Andrew F . Davis, Christoph Hellwig, Chenbo Feng,
Alistair Strachan, Hridya Valsaraju, Sandeep Patil, Hillf Danton,
Dave Airlie, dri-devel
Add very trivial allocation and import test for dma-heaps,
utilizing the vgem driver as a test importer.
A good chunk of this code taken from:
tools/testing/selftests/android/ion/ionmap_test.c
Originally by 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>
---
v2:
* Switched to use reworked dma-heap apis
v3:
* Add simple mmap
* Utilize dma-buf testdev to test importing
v4:
* Rework to use vgem
* Pass in fd_flags to match interface changes
* Skip . and .. dirs
v6:
* Number of style/cleanups suggested by Brian
v7:
* Whitespace fixup for checkpatch
v8:
* More checkpatch whitespace fixups
v9:
* Better handling error returns out to main, suggested
by Brian Starkey
* Switch to using snprintf, suggested by Brian
v14:
* Fix a missing return value
* Add calls to test the GET_FEATURES ioctl
* Build fix reported by kernel test robot <lkp@intel.com>
and fixed by Xiao Yang <ice_yangxiao@163.com>
* Minor Makefile cleanups
v15:
* Remove usage of dropped get_features ioctl
v16:
* Add extra ioctl compatibility testing suggested by
Daniel Vetter
---
tools/testing/selftests/dmabuf-heaps/Makefile | 6 +
.../selftests/dmabuf-heaps/dmabuf-heap.c | 396 ++++++++++++++++++
2 files changed, 402 insertions(+)
create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile
create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
diff --git a/tools/testing/selftests/dmabuf-heaps/Makefile b/tools/testing/selftests/dmabuf-heaps/Makefile
new file mode 100644
index 000000000000..607c2acd2082
--- /dev/null
+++ b/tools/testing/selftests/dmabuf-heaps/Makefile
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -static -O3 -Wl,-no-as-needed -Wall -I../../../../usr/include
+
+TEST_GEN_PROGS = dmabuf-heap
+
+include ../lib.mk
diff --git a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
new file mode 100644
index 000000000000..3e53ad331bdc
--- /dev/null
+++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
@@ -0,0 +1,396 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <linux/dma-buf.h>
+#include <drm/drm.h>
+
+#include "../../../../include/uapi/linux/dma-heap.h"
+
+#define DEVPATH "/dev/dma_heap"
+
+static int check_vgem(int fd)
+{
+ drm_version_t version = { 0 };
+ char name[5];
+ int ret;
+
+ version.name_len = 4;
+ version.name = name;
+
+ ret = ioctl(fd, DRM_IOCTL_VERSION, &version);
+ if (ret)
+ return 0;
+
+ return !strcmp(name, "vgem");
+}
+
+static int open_vgem(void)
+{
+ int i, fd;
+ const char *drmstr = "/dev/dri/card";
+
+ fd = -1;
+ for (i = 0; i < 16; i++) {
+ char name[80];
+
+ snprintf(name, 80, "%s%u", drmstr, i);
+
+ fd = open(name, O_RDWR);
+ if (fd < 0)
+ continue;
+
+ if (!check_vgem(fd)) {
+ close(fd);
+ fd = -1;
+ continue;
+ } else {
+ break;
+ }
+ }
+ return fd;
+}
+
+static int import_vgem_fd(int vgem_fd, int dma_buf_fd, uint32_t *handle)
+{
+ struct drm_prime_handle import_handle = {
+ .fd = dma_buf_fd,
+ .flags = 0,
+ .handle = 0,
+ };
+ int ret;
+
+ ret = ioctl(vgem_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &import_handle);
+ if (ret == 0)
+ *handle = import_handle.handle;
+ return ret;
+}
+
+static void close_handle(int vgem_fd, uint32_t handle)
+{
+ struct drm_gem_close close = {
+ .handle = handle,
+ };
+
+ ioctl(vgem_fd, DRM_IOCTL_GEM_CLOSE, &close);
+}
+
+static int dmabuf_heap_open(char *name)
+{
+ int ret, fd;
+ char buf[256];
+
+ ret = snprintf(buf, 256, "%s/%s", DEVPATH, name);
+ if (ret < 0) {
+ printf("snprintf failed!\n");
+ return ret;
+ }
+
+ fd = open(buf, O_RDWR);
+ if (fd < 0)
+ printf("open %s failed!\n", buf);
+ return fd;
+}
+
+static int dmabuf_heap_alloc_fdflags(int fd, size_t len, unsigned int fd_flags,
+ unsigned int heap_flags, int *dmabuf_fd)
+{
+ struct dma_heap_allocation_data data = {
+ .len = len,
+ .fd = 0,
+ .fd_flags = fd_flags,
+ .heap_flags = heap_flags,
+ };
+ int ret;
+
+ if (!dmabuf_fd)
+ return -EINVAL;
+
+ ret = ioctl(fd, DMA_HEAP_IOC_ALLOC, &data);
+ if (ret < 0)
+ return ret;
+ *dmabuf_fd = (int)data.fd;
+ return ret;
+}
+
+static int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags,
+ int *dmabuf_fd)
+{
+ return dmabuf_heap_alloc_fdflags(fd, len, O_RDWR | O_CLOEXEC, flags,
+ dmabuf_fd);
+}
+
+static void dmabuf_sync(int fd, int start_stop)
+{
+ struct dma_buf_sync sync = {
+ .flags = start_stop | DMA_BUF_SYNC_RW,
+ };
+ int ret;
+
+ ret = ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync);
+ if (ret)
+ printf("sync failed %d\n", errno);
+}
+
+#define ONE_MEG (1024 * 1024)
+
+static int test_alloc_and_import(char *heap_name)
+{
+ int heap_fd = -1, dmabuf_fd = -1, importer_fd = -1;
+ uint32_t handle = 0;
+ void *p = NULL;
+ int ret;
+
+ printf("Testing heap: %s\n", heap_name);
+
+ heap_fd = dmabuf_heap_open(heap_name);
+ if (heap_fd < 0)
+ return -1;
+
+ printf("Allocating 1 MEG\n");
+ ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0, &dmabuf_fd);
+ if (ret) {
+ printf("Allocation Failed!\n");
+ ret = -1;
+ goto out;
+ }
+ /* mmap and write a simple pattern */
+ p = mmap(NULL,
+ ONE_MEG,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED,
+ dmabuf_fd,
+ 0);
+ if (p == MAP_FAILED) {
+ printf("mmap() failed: %m\n");
+ ret = -1;
+ goto out;
+ }
+ printf("mmap passed\n");
+
+ dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
+ memset(p, 1, ONE_MEG / 2);
+ memset((char *)p + ONE_MEG / 2, 0, ONE_MEG / 2);
+ dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
+
+ importer_fd = open_vgem();
+ if (importer_fd < 0) {
+ ret = importer_fd;
+ printf("Failed to open vgem\n");
+ goto out;
+ }
+
+ ret = import_vgem_fd(importer_fd, dmabuf_fd, &handle);
+ if (ret < 0) {
+ printf("Failed to import buffer\n");
+ goto out;
+ }
+ printf("import passed\n");
+
+ dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
+ memset(p, 0xff, ONE_MEG);
+ dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
+ printf("syncs passed\n");
+
+ close_handle(importer_fd, handle);
+ ret = 0;
+
+out:
+ if (p)
+ munmap(p, ONE_MEG);
+ if (importer_fd >= 0)
+ close(importer_fd);
+ if (dmabuf_fd >= 0)
+ close(dmabuf_fd);
+ if (heap_fd >= 0)
+ close(heap_fd);
+
+ return ret;
+}
+
+/* Test the ioctl version compatibility w/ a smaller structure then expected */
+static int dmabuf_heap_alloc_older(int fd, size_t len, unsigned int flags,
+ int *dmabuf_fd)
+{
+ int ret;
+ unsigned int older_alloc_ioctl;
+ struct dma_heap_allocation_data_smaller {
+ __u64 len;
+ __u32 fd;
+ __u32 fd_flags;
+ } data = {
+ .len = len,
+ .fd = 0,
+ .fd_flags = O_RDWR | O_CLOEXEC,
+ };
+
+ older_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
+ struct dma_heap_allocation_data_smaller);
+ if (!dmabuf_fd)
+ return -EINVAL;
+
+ ret = ioctl(fd, older_alloc_ioctl, &data);
+ if (ret < 0)
+ return ret;
+ *dmabuf_fd = (int)data.fd;
+ return ret;
+}
+
+/* Test the ioctl version compatibility w/ a larger structure then expected */
+static int dmabuf_heap_alloc_newer(int fd, size_t len, unsigned int flags,
+ int *dmabuf_fd)
+{
+ int ret;
+ unsigned int newer_alloc_ioctl;
+ struct dma_heap_allocation_data_bigger {
+ __u64 len;
+ __u32 fd;
+ __u32 fd_flags;
+ __u64 heap_flags;
+ __u64 garbage1;
+ __u64 garbage2;
+ __u64 garbage3;
+ } data = {
+ .len = len,
+ .fd = 0,
+ .fd_flags = O_RDWR | O_CLOEXEC,
+ .heap_flags = flags,
+ .garbage1 = 0xffffffff,
+ .garbage2 = 0x88888888,
+ .garbage3 = 0x11111111,
+ };
+
+ newer_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
+ struct dma_heap_allocation_data_bigger);
+ if (!dmabuf_fd)
+ return -EINVAL;
+
+ ret = ioctl(fd, newer_alloc_ioctl, &data);
+ if (ret < 0)
+ return ret;
+
+ *dmabuf_fd = (int)data.fd;
+ return ret;
+}
+
+static int test_alloc_compat(char *heap_name)
+{
+ int heap_fd = -1, dmabuf_fd = -1;
+ int ret;
+
+ heap_fd = dmabuf_heap_open(heap_name);
+ if (heap_fd < 0)
+ return -1;
+
+ printf("Testing (theoretical)older alloc compat\n");
+ ret = dmabuf_heap_alloc_older(heap_fd, ONE_MEG, 0, &dmabuf_fd);
+ if (ret) {
+ printf("Older compat allocation failed!\n");
+ ret = -1;
+ goto out;
+ }
+ close(dmabuf_fd);
+
+ printf("Testing (theoretical)newer alloc compat\n");
+ ret = dmabuf_heap_alloc_newer(heap_fd, ONE_MEG, 0, &dmabuf_fd);
+ if (ret) {
+ printf("Newer compat allocation failed!\n");
+ ret = -1;
+ goto out;
+ }
+ printf("Ioctl compatibility tests passed\n");
+out:
+ if (dmabuf_fd >= 0)
+ close(dmabuf_fd);
+ if (heap_fd >= 0)
+ close(heap_fd);
+
+ return ret;
+}
+
+static int test_alloc_errors(char *heap_name)
+{
+ int heap_fd = -1, dmabuf_fd = -1;
+ int ret;
+
+ heap_fd = dmabuf_heap_open(heap_name);
+ if (heap_fd < 0)
+ return -1;
+
+ printf("Testing expected error cases\n");
+ ret = dmabuf_heap_alloc(0, ONE_MEG, 0x111111, &dmabuf_fd);
+ if (!ret) {
+ printf("Did not see expected error (invalid fd)!\n");
+ ret = -1;
+ goto out;
+ }
+
+ ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0x111111, &dmabuf_fd);
+ if (!ret) {
+ printf("Did not see expected error (invalid heap flags)!\n");
+ ret = -1;
+ goto out;
+ }
+
+ ret = dmabuf_heap_alloc_fdflags(heap_fd, ONE_MEG,
+ ~(O_RDWR | O_CLOEXEC), 0, &dmabuf_fd);
+ if (!ret) {
+ printf("Did not see expected error (invalid fd flags)!\n");
+ ret = -1;
+ goto out;
+ }
+
+ printf("Expected error checking passed\n");
+out:
+ if (dmabuf_fd >= 0)
+ close(dmabuf_fd);
+ if (heap_fd >= 0)
+ close(heap_fd);
+
+ return ret;
+}
+
+int main(void)
+{
+ DIR *d;
+ struct dirent *dir;
+ int ret = -1;
+
+ d = opendir(DEVPATH);
+ if (!d) {
+ printf("No %s directory?\n", DEVPATH);
+ return -1;
+ }
+
+ while ((dir = readdir(d)) != NULL) {
+ if (!strncmp(dir->d_name, ".", 2))
+ continue;
+ if (!strncmp(dir->d_name, "..", 3))
+ continue;
+
+ ret = test_alloc_and_import(dir->d_name);
+ if (ret)
+ break;
+
+ ret = test_alloc_compat(dir->d_name);
+ if (ret)
+ break;
+
+ ret = test_alloc_errors(dir->d_name);
+ if (ret)
+ break;
+ }
+ closedir(d);
+
+ return ret;
+}
--
2.17.1
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps
2019-12-03 17:26 ` [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps John Stultz
@ 2019-12-12 16:20 ` Andrew F. Davis
2019-12-12 18:37 ` John Stultz
0 siblings, 1 reply; 10+ messages in thread
From: Andrew F. Davis @ 2019-12-12 16:20 UTC (permalink / raw)
To: John Stultz, lkml
Cc: Laura Abbott, Benjamin Gaignard, Sumit Semwal, Liam Mark,
Pratik Patel, Brian Starkey, Vincent Donnefort, Sudipto Paul,
Christoph Hellwig, Chenbo Feng, Alistair Strachan,
Hridya Valsaraju, Sandeep Patil, Hillf Danton, Dave Airlie,
dri-devel
On 12/3/19 12:26 PM, John Stultz wrote:
> 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>
> ---
> v2:
> * Switch allocate to return dmabuf fd
> * Simplify init code
> * Checkpatch fixups
> * Droped dead system-contig code
> v3:
> * Whitespace fixups from Benjamin
> * Make sure we're zeroing the allocated pages (from Liam)
> * Use PAGE_ALIGN() consistently (suggested by Brian)
> * Fold in new registration style from Andrew
> * Avoid needless dynamic allocation of sys_heap (suggested by
> Christoph)
> * Minor cleanups
> * Folded in changes from Andrew to use simplified page list
> from the heap helpers
> v4:
> * Optimization to allocate pages in chunks, similar to old
> pagepool code
> * Use fd_flags when creating dmabuf fd (Suggested by Benjamin)
> v5:
> * Back out large order page allocations (was leaking memory,
> as the page array didn't properly track order size)
> v6:
> * Minor whitespace change suggested by Brian
> * Remove unused variable
> v7:
> * Use newly lower-cased init_heap_helper_buffer helper
> * Add system heap DOS avoidance suggested by Laura from ION code
> * Use new dmabuf export helper
> v8:
> * Make struct dma_heap_ops consts (suggested by Christoph)
> * Get rid of needless struct system_heap (suggested by Christoph)
> * Condense dma_heap_buffer and heap_helper_buffer (suggested by
> Christoph)
> * Add forgotten include file to fix build issue on x86
> v12:
> * Minor tweaks to prep loading heap from module
> v14:
> * Fix "redundant assignment to variable ret" issue reported
> by Colin King and fixed by Andrew Davis
> v15:
> * Drop unused heap flag from heap_helper_buffer as suggested
> by Sandeep Patil
> ---
> 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
>
> diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
> index bffa58fc3e6e..0613bb7770f5 100644
> --- 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
> diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig
> new file mode 100644
> index 000000000000..205052744169
> --- /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.
> diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile
> index de49898112db..d1808eca2581 100644
> --- 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
> diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
> new file mode 100644
> index 000000000000..1aa01e98c595
> --- /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";
nit: Would prefer the name just be "system", the heap part is redundant
given it will be in a "heaps" directory, other heaps don't have that. As
the heap will be accessed by users using this name:
(/sys/dma_heap/system_heap) we need to think of it like an ABI and get
it right the first time. The directory name should probably also be
plural "heaps" as it is a collection of heaps..
Andrew
> + 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");
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework
2019-12-03 17:26 ` [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework John Stultz
@ 2019-12-12 16:52 ` Andrew F. Davis
2019-12-12 18:33 ` John Stultz
0 siblings, 1 reply; 10+ messages in thread
From: Andrew F. Davis @ 2019-12-12 16:52 UTC (permalink / raw)
To: John Stultz, lkml
Cc: Laura Abbott, Benjamin Gaignard, Sumit Semwal, Liam Mark,
Pratik Patel, Brian Starkey, Vincent Donnefort, Sudipto Paul,
Christoph Hellwig, Chenbo Feng, Alistair Strachan,
Hridya Valsaraju, Sandeep Patil, Hillf Danton, Dave Airlie,
dri-devel
On 12/3/19 12:26 PM, John Stultz wrote:
> From: "Andrew F. Davis" <afd@ti.com>
>
> 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>
> ---
> v2:
> * Folded down fixes I had previously shared in implementing
> heaps
> * Make flags a u64 (Suggested by Laura)
> * Add PAGE_ALIGN() fix to the core alloc funciton
> * IOCTL fixups suggested by Brian
> * Added fixes suggested by Benjamin
> * Removed core stats mgmt, as that should be implemented by
> per-heap code
> * Changed alloc to return a dma-buf fd, rather than a buffer
> (as it simplifies error handling)
> v3:
> * Removed scare-quotes in MAINTAINERS email address
> * Get rid of .release function as it didn't do anything (from
> Christoph)
> * Renamed filp to file (suggested by Christoph)
> * Split out ioctl handling to separate function (suggested by
> Christoph)
> * Add comment documenting PAGE_ALIGN usage (suggested by Brian)
> * Switch from idr to Xarray (suggested by Brian)
> * Fixup cdev creation (suggested by Brian)
> * Avoid EXPORT_SYMBOL until we finalize modules (suggested by
> Brian)
> * Make struct dma_heap internal only (folded in from Andrew)
> * Small cleanups suggested by GregKH
> * Provide class->devnode callback to get consistent /dev/
> subdirectory naming (Suggested by Bjorn)
> v4:
> * Folded down dma-heap.h change that was in a following patch
> * Added fd_flags entry to allocation structure and pass it
> through to heap code for use on dma-buf fd creation (suggested
> by Benjamin)
> v5:
> * Minor cleanups
> v6:
> * Improved error path handling, minor whitespace fixes, both
> suggested by Brian
> v7:
> * Longer Kconfig description to quiet checkpatch warnings
> * Re-add compat_ioctl bits (Hridya noticed 32bit userland wasn't
> working)
> v8:
> * Make struct dma_heap_ops consts (Suggested by Christoph)
> * Checkpatch whitespace fixups
> v9:
> * Minor cleanups suggested by Brian Starkey
> * Rename dma_heap_get_data->dma_heap_get_drvdata suggested
> by Hilf Danton
> v11:
> * Kconfig text improvements suggested by Randy Dunlap
> v12:
> * Add logic to prevent duplicately named heaps being added
> * Add symbol exports for heaps as modules
> v13:
> * Re-remove symbol exports per discussion w/ Brian. Will
> resubmit in a separte patch for review
> v14:
> * Reworked ioctl handler to zero fill any difference in
> structure size, similar to what the DRM core does, as
> suggested by Dave Airlie
> * Removed now unnecessary reserved bits in allocate_data
> * Added get_features ioctl as suggested by Dave Airlie
> * Removed pr_warn_once messages as requested by Dave
> Airlie
> v15:
> * Dropped the get_features ioctl as suggested by Brian
> Starkey and Daniel Vetter
> * Add listhead comment suggested by Sandeep Patil
> * Dropped minor value in struct dma_heap as suggested by
> Sandeep Patil
> * Fix grammar typo from Brian Starkey
> v16:
> * Typo fix suggested by Hridya Valsaraju <hridya@google.com>
> ---
> 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
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8608724835dd..44b7cbc0ec29 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4971,6 +4971,24 @@ 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
> diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
> index a23b6752d11a..bffa58fc3e6e 100644
> --- 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
> diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile
> index 03479da06422..caee5eb3d351 100644
> --- a/drivers/dma-buf/Makefile
> +++ b/drivers/dma-buf/Makefile
> @@ -1,6 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> obj-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-$(CONFIG_SYNC_FILE) += sync_file.o
> obj-$(CONFIG_SW_SYNC) += sw_sync.o sync_debug.o
> obj-$(CONFIG_UDMABUF) += udmabuf.o
> diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
> new file mode 100644
> index 000000000000..4f04d104ae61
> --- /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);
> diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
> new file mode 100644
> index 000000000000..454e354d1ffb
> --- /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 */
> diff --git a/include/uapi/linux/dma-heap.h b/include/uapi/linux/dma-heap.h
> new file mode 100644
> index 000000000000..73e7f66c1cae
> --- /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)
> +
<subsytem>_IOC_
Seems more common for the internal numberings and such, what the user
calls is more often (espesially in DRM and DMA_BUF):
<subsytem>_IOCTL_<function>
This is really just another naming nit but becouse this one really *is*
ABI then getting our prefrence right is a must, up to you here.
Andrew
> +#endif /* _UAPI_LINUX_DMABUF_POOL_H */
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework
2019-12-12 16:52 ` Andrew F. Davis
@ 2019-12-12 18:33 ` John Stultz
0 siblings, 0 replies; 10+ messages in thread
From: John Stultz @ 2019-12-12 18:33 UTC (permalink / raw)
To: Andrew F. Davis
Cc: lkml, Laura Abbott, Benjamin Gaignard, Sumit Semwal, Liam Mark,
Pratik Patel, Brian Starkey, Vincent Donnefort, Sudipto Paul,
Christoph Hellwig, Chenbo Feng, Alistair Strachan,
Hridya Valsaraju, Sandeep Patil, Hillf Danton, Dave Airlie,
dri-devel
On Thu, Dec 12, 2019 at 8:52 AM Andrew F. Davis <afd@ti.com> wrote:
> On 12/3/19 12:26 PM, John Stultz wrote:
> > +#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)
> > +
>
> <subsytem>_IOC_
>
> Seems more common for the internal numberings and such, what the user
> calls is more often (espesially in DRM and DMA_BUF):
>
> <subsytem>_IOCTL_<function>
>
> This is really just another naming nit but becouse this one really *is*
> ABI then getting our prefrence right is a must, up to you here.
So yea, Sumit has already pulled these into drm-misc-next, so this
feedback is just a few days too late.
But it's not a bad suggestion, so if you want to submit a tack-on
patch to drm-misc-next I suspect we can, try to pull it in.
thanks
-john
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps
2019-12-12 16:20 ` Andrew F. Davis
@ 2019-12-12 18:37 ` John Stultz
0 siblings, 0 replies; 10+ messages in thread
From: John Stultz @ 2019-12-12 18:37 UTC (permalink / raw)
To: Andrew F. Davis
Cc: lkml, Laura Abbott, Benjamin Gaignard, Sumit Semwal, Liam Mark,
Pratik Patel, Brian Starkey, Vincent Donnefort, Sudipto Paul,
Christoph Hellwig, Chenbo Feng, Alistair Strachan,
Hridya Valsaraju, Sandeep Patil, Hillf Danton, Dave Airlie,
dri-devel
On Thu, Dec 12, 2019 at 8:20 AM Andrew F. Davis <afd@ti.com> wrote:
> On 12/3/19 12:26 PM, John Stultz wrote:
> > +static int system_heap_create(void)
> > +{
> > + struct dma_heap_export_info exp_info;
> > + int ret = 0;
> > +
> > + exp_info.name = "system_heap";
>
>
> nit: Would prefer the name just be "system", the heap part is redundant
> given it will be in a "heaps" directory, other heaps don't have that. As
> the heap will be accessed by users using this name:
> (/sys/dma_heap/system_heap) we need to think of it like an ABI and get
> it right the first time. The directory name should probably also be
> plural "heaps" as it is a collection of heaps..
Wish this thought had come up earlier. Again, not bad suggestions,
just a bit late as the patches have been queued in drm-misc-next.
Can you submit a tack-on patch to address this, and we can see about
pulling it in so it lands before the code heads to Linus?
thanks
-john
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2019-12-12 18:37 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-12-03 17:26 [RESEND][PATCH v16 0/5] DMA-BUF Heaps (destaging ION) John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 1/5] dma-buf: Add dma-buf heaps framework John Stultz
2019-12-12 16:52 ` Andrew F. Davis
2019-12-12 18:33 ` John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 2/5] dma-buf: heaps: Add heap helpers John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 3/5] dma-buf: heaps: Add system heap to dmabuf heaps John Stultz
2019-12-12 16:20 ` Andrew F. Davis
2019-12-12 18:37 ` John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 4/5] dma-buf: heaps: Add CMA " John Stultz
2019-12-03 17:26 ` [RESEND][PATCH v16 5/5] kselftests: Add dma-heap test John Stultz
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).