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Subject[RFC PATCH v2 6/9] hyper_dmabuf: hyper_DMABUF synchronization across VM
Date
All of hyper_DMABUF operations now (hyper_dmabuf_ops.c) send a message
to the exporting VM for synchronization between two VMs. For this, every
mapping done by importer will make exporter perform shadow mapping of
original DMA-BUF. Then all consecutive DMA-BUF operations (attach, detach,
map/unmap and so on) will be mimicked on this shadowed DMA-BUF for tracking
and synchronization purpose (e.g. +-reference count to check the status).

Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
Signed-off-by: Mateusz Polrola <mateuszx.potrola@intel.com>
---
drivers/dma-buf/hyper_dmabuf/Makefile | 1 +
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c | 53 +++-
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h | 2 +
drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c | 157 +++++++++-
.../hyper_dmabuf/hyper_dmabuf_remote_sync.c | 324 +++++++++++++++++++++
.../hyper_dmabuf/hyper_dmabuf_remote_sync.h | 32 ++
6 files changed, 565 insertions(+), 4 deletions(-)
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
create mode 100644 drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.h

diff --git a/drivers/dma-buf/hyper_dmabuf/Makefile b/drivers/dma-buf/hyper_dmabuf/Makefile
index b9ab4eeca6f2..702696f29215 100644
--- a/drivers/dma-buf/hyper_dmabuf/Makefile
+++ b/drivers/dma-buf/hyper_dmabuf/Makefile
@@ -9,6 +9,7 @@ ifneq ($(KERNELRELEASE),)
hyper_dmabuf_ops.o \
hyper_dmabuf_msg.o \
hyper_dmabuf_id.o \
+ hyper_dmabuf_remote_sync.o \

ifeq ($(CONFIG_HYPER_DMABUF_XEN), y)
$(TARGET_MODULE)-objs += backends/xen/hyper_dmabuf_xen_comm.o \
diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c
index 7176fa8fb139..1592d5cfaa52 100644
--- a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c
+++ b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.c
@@ -34,6 +34,7 @@
#include <linux/workqueue.h>
#include "hyper_dmabuf_drv.h"
#include "hyper_dmabuf_msg.h"
+#include "hyper_dmabuf_remote_sync.h"
#include "hyper_dmabuf_list.h"

struct cmd_process {
@@ -92,6 +93,25 @@ void hyper_dmabuf_create_req(struct hyper_dmabuf_req *req,
req->op[i] = op[i];
break;

+ case HYPER_DMABUF_OPS_TO_REMOTE:
+ /* notifying dmabuf map/unmap to importer (probably not needed)
+ * for dmabuf synchronization
+ */
+ break;
+
+ case HYPER_DMABUF_OPS_TO_SOURCE:
+ /* notifying dmabuf map/unmap to exporter, map will make
+ * the driver to do shadow mapping or unmapping for
+ * synchronization with original exporter (e.g. i915)
+ *
+ * command : DMABUF_OPS_TO_SOURCE.
+ * op0~3 : hyper_dmabuf_id
+ * op4 : map(=1)/unmap(=2)/attach(=3)/detach(=4)
+ */
+ for (i = 0; i < 5; i++)
+ req->op[i] = op[i];
+ break;
+
default:
/* no command found */
return;
@@ -201,6 +221,12 @@ static void cmd_process_work(struct work_struct *work)

break;

+ case HYPER_DMABUF_OPS_TO_REMOTE:
+ /* notifying dmabuf map/unmap to importer
+ * (probably not needed) for dmabuf synchronization
+ */
+ break;
+
default:
/* shouldn't get here */
break;
@@ -217,6 +243,7 @@ int hyper_dmabuf_msg_parse(int domid, struct hyper_dmabuf_req *req)
struct imported_sgt_info *imported;
struct exported_sgt_info *exported;
hyper_dmabuf_id_t hid;
+ int ret;

if (!req) {
dev_err(hy_drv_priv->dev, "request is NULL\n");
@@ -229,7 +256,7 @@ int hyper_dmabuf_msg_parse(int domid, struct hyper_dmabuf_req *req)
hid.rng_key[2] = req->op[3];

if ((req->cmd < HYPER_DMABUF_EXPORT) ||
- (req->cmd > HYPER_DMABUF_NOTIFY_UNEXPORT)) {
+ (req->cmd > HYPER_DMABUF_OPS_TO_SOURCE)) {
dev_err(hy_drv_priv->dev, "invalid command\n");
return -EINVAL;
}
@@ -271,6 +298,30 @@ int hyper_dmabuf_msg_parse(int domid, struct hyper_dmabuf_req *req)
return req->cmd;
}

+ /* dma buf remote synchronization */
+ if (req->cmd == HYPER_DMABUF_OPS_TO_SOURCE) {
+ /* notifying dmabuf map/unmap to exporter, map will
+ * make the driver to do shadow mapping
+ * or unmapping for synchronization with original
+ * exporter (e.g. i915)
+ *
+ * command : DMABUF_OPS_TO_SOURCE.
+ * op0~3 : hyper_dmabuf_id
+ * op1 : enum hyper_dmabuf_ops {....}
+ */
+ dev_dbg(hy_drv_priv->dev,
+ "%s: HYPER_DMABUF_OPS_TO_SOURCE\n", __func__);
+
+ ret = hyper_dmabuf_remote_sync(hid, req->op[4]);
+
+ if (ret)
+ req->stat = HYPER_DMABUF_REQ_ERROR;
+ else
+ req->stat = HYPER_DMABUF_REQ_PROCESSED;
+
+ return req->cmd;
+ }
+
/* synchronous dma_buf_fd export */
if (req->cmd == HYPER_DMABUF_EXPORT_FD) {
/* find a corresponding SGT for the id */
diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h
index 63a39d068d69..82d2900d3077 100644
--- a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h
+++ b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_msg.h
@@ -48,6 +48,8 @@ enum hyper_dmabuf_command {
HYPER_DMABUF_EXPORT_FD,
HYPER_DMABUF_EXPORT_FD_FAILED,
HYPER_DMABUF_NOTIFY_UNEXPORT,
+ HYPER_DMABUF_OPS_TO_REMOTE,
+ HYPER_DMABUF_OPS_TO_SOURCE,
};

enum hyper_dmabuf_ops {
diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c
index b4d3c2caad73..02d42c099ad9 100644
--- a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c
+++ b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_ops.c
@@ -51,16 +51,71 @@ static int dmabuf_refcount(struct dma_buf *dma_buf)
return -EINVAL;
}

+static int sync_request(hyper_dmabuf_id_t hid, int dmabuf_ops)
+{
+ struct hyper_dmabuf_req *req;
+ struct hyper_dmabuf_bknd_ops *bknd_ops = hy_drv_priv->bknd_ops;
+ int op[5];
+ int i;
+ int ret;
+
+ op[0] = hid.id;
+
+ for (i = 0; i < 3; i++)
+ op[i+1] = hid.rng_key[i];
+
+ op[4] = dmabuf_ops;
+
+ req = kcalloc(1, sizeof(*req), GFP_KERNEL);
+
+ if (!req)
+ return -ENOMEM;
+
+ hyper_dmabuf_create_req(req, HYPER_DMABUF_OPS_TO_SOURCE, &op[0]);
+
+ /* send request and wait for a response */
+ ret = bknd_ops->send_req(HYPER_DMABUF_DOM_ID(hid), req,
+ WAIT_AFTER_SYNC_REQ);
+
+ if (ret < 0) {
+ dev_dbg(hy_drv_priv->dev,
+ "dmabuf sync request failed:%d\n", req->op[4]);
+ }
+
+ kfree(req);
+
+ return ret;
+}
+
static int hyper_dmabuf_ops_attach(struct dma_buf *dmabuf,
struct device *dev,
struct dma_buf_attachment *attach)
{
- return 0;
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!attach->dmabuf->priv)
+ return -EINVAL;
+
+ imported = (struct imported_sgt_info *)attach->dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_ATTACH);
+
+ return ret;
}

static void hyper_dmabuf_ops_detach(struct dma_buf *dmabuf,
struct dma_buf_attachment *attach)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!attach->dmabuf->priv)
+ return;
+
+ imported = (struct imported_sgt_info *)attach->dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_DETACH);
}

static struct sg_table *hyper_dmabuf_ops_map(
@@ -70,6 +125,7 @@ static struct sg_table *hyper_dmabuf_ops_map(
struct sg_table *st;
struct imported_sgt_info *imported;
struct pages_info *pg_info;
+ int ret;

if (!attachment->dmabuf->priv)
return NULL;
@@ -91,6 +147,8 @@ static struct sg_table *hyper_dmabuf_ops_map(
if (!dma_map_sg(attachment->dev, st->sgl, st->nents, dir))
goto err_free_sg;

+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_MAP);
+
kfree(pg_info->pgs);
kfree(pg_info);

@@ -113,6 +171,7 @@ static void hyper_dmabuf_ops_unmap(struct dma_buf_attachment *attachment,
enum dma_data_direction dir)
{
struct imported_sgt_info *imported;
+ int ret;

if (!attachment->dmabuf->priv)
return;
@@ -123,12 +182,15 @@ static void hyper_dmabuf_ops_unmap(struct dma_buf_attachment *attachment,

sg_free_table(sg);
kfree(sg);
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_UNMAP);
}

static void hyper_dmabuf_ops_release(struct dma_buf *dma_buf)
{
struct imported_sgt_info *imported;
struct hyper_dmabuf_bknd_ops *bknd_ops = hy_drv_priv->bknd_ops;
+ int ret;
int finish;

if (!dma_buf->priv)
@@ -155,6 +217,8 @@ static void hyper_dmabuf_ops_release(struct dma_buf *dma_buf)
finish = imported && !imported->valid &&
!imported->importers;

+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_RELEASE);
+
/*
* Check if buffer is still valid and if not remove it
* from imported list. That has to be done after sending
@@ -169,18 +233,48 @@ static void hyper_dmabuf_ops_release(struct dma_buf *dma_buf)
static int hyper_dmabuf_ops_begin_cpu_access(struct dma_buf *dmabuf,
enum dma_data_direction dir)
{
- return 0;
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return -EINVAL;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_BEGIN_CPU_ACCESS);
+
+ return ret;
}

static int hyper_dmabuf_ops_end_cpu_access(struct dma_buf *dmabuf,
enum dma_data_direction dir)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return -EINVAL;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_END_CPU_ACCESS);
+
return 0;
}

static void *hyper_dmabuf_ops_kmap_atomic(struct dma_buf *dmabuf,
unsigned long pgnum)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return NULL;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_KMAP_ATOMIC);
+
/* TODO: NULL for now. Need to return the addr of mapped region */
return NULL;
}
@@ -188,10 +282,29 @@ static void *hyper_dmabuf_ops_kmap_atomic(struct dma_buf *dmabuf,
static void hyper_dmabuf_ops_kunmap_atomic(struct dma_buf *dmabuf,
unsigned long pgnum, void *vaddr)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_KUNMAP_ATOMIC);
}

static void *hyper_dmabuf_ops_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return NULL;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_KMAP);
+
/* for now NULL.. need to return the address of mapped region */
return NULL;
}
@@ -199,21 +312,59 @@ static void *hyper_dmabuf_ops_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
static void hyper_dmabuf_ops_kunmap(struct dma_buf *dmabuf, unsigned long pgnum,
void *vaddr)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_KUNMAP);
}

static int hyper_dmabuf_ops_mmap(struct dma_buf *dmabuf,
struct vm_area_struct *vma)
{
- return 0;
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return -EINVAL;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_MMAP);
+
+ return ret;
}

static void *hyper_dmabuf_ops_vmap(struct dma_buf *dmabuf)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return NULL;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_VMAP);
+
return NULL;
}

static void hyper_dmabuf_ops_vunmap(struct dma_buf *dmabuf, void *vaddr)
{
+ struct imported_sgt_info *imported;
+ int ret;
+
+ if (!dmabuf->priv)
+ return;
+
+ imported = (struct imported_sgt_info *)dmabuf->priv;
+
+ ret = sync_request(imported->hid, HYPER_DMABUF_OPS_VUNMAP);
}

static const struct dma_buf_ops hyper_dmabuf_ops = {
diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
new file mode 100644
index 000000000000..55c2c1828859
--- /dev/null
+++ b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.c
@@ -0,0 +1,324 @@
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * SPDX-License-Identifier: (MIT OR GPL-2.0)
+ *
+ * Authors:
+ * Dongwon Kim <dongwon.kim@intel.com>
+ * Mateusz Polrola <mateuszx.potrola@intel.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/dma-buf.h>
+#include "hyper_dmabuf_drv.h"
+#include "hyper_dmabuf_struct.h"
+#include "hyper_dmabuf_list.h"
+#include "hyper_dmabuf_msg.h"
+#include "hyper_dmabuf_id.h"
+#include "hyper_dmabuf_sgl_proc.h"
+
+/* Whenever importer does dma operations from remote domain,
+ * a notification is sent to the exporter so that exporter
+ * issues equivalent dma operation on the original dma buf
+ * for indirect synchronization via shadow operations.
+ *
+ * All ptrs and references (e.g struct sg_table*,
+ * struct dma_buf_attachment) created via these operations on
+ * exporter's side are kept in stack (implemented as circular
+ * linked-lists) separately so that those can be re-referenced
+ * later when unmapping operations are invoked to free those.
+ *
+ * The very first element on the bottom of each stack holds
+ * is what is created when initial exporting is issued so it
+ * should not be modified or released by this fuction.
+ */
+int hyper_dmabuf_remote_sync(hyper_dmabuf_id_t hid, int ops)
+{
+ struct exported_sgt_info *exported;
+ struct sgt_list *sgtl;
+ struct attachment_list *attachl;
+ struct kmap_vaddr_list *va_kmapl;
+ struct vmap_vaddr_list *va_vmapl;
+ int ret;
+
+ /* find a coresponding SGT for the id */
+ exported = hyper_dmabuf_find_exported(hid);
+
+ if (!exported) {
+ dev_err(hy_drv_priv->dev,
+ "dmabuf remote sync::can't find exported list\n");
+ return -ENOENT;
+ }
+
+ switch (ops) {
+ case HYPER_DMABUF_OPS_ATTACH:
+ attachl = kcalloc(1, sizeof(*attachl), GFP_KERNEL);
+
+ if (!attachl)
+ return -ENOMEM;
+
+ attachl->attach = dma_buf_attach(exported->dma_buf,
+ hy_drv_priv->dev);
+
+ if (!attachl->attach) {
+ kfree(attachl);
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_ATTACH\n");
+ return -ENOMEM;
+ }
+
+ list_add(&attachl->list, &exported->active_attached->list);
+ break;
+
+ case HYPER_DMABUF_OPS_DETACH:
+ if (list_empty(&exported->active_attached->list)) {
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_DETACH\n");
+ dev_err(hy_drv_priv->dev,
+ "no more dmabuf attachment left to be detached\n");
+ return -EFAULT;
+ }
+
+ attachl = list_first_entry(&exported->active_attached->list,
+ struct attachment_list, list);
+
+ dma_buf_detach(exported->dma_buf, attachl->attach);
+ list_del(&attachl->list);
+ kfree(attachl);
+ break;
+
+ case HYPER_DMABUF_OPS_MAP:
+ if (list_empty(&exported->active_attached->list)) {
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_MAP\n");
+ dev_err(hy_drv_priv->dev,
+ "no more dmabuf attachment left to be mapped\n");
+ return -EFAULT;
+ }
+
+ attachl = list_first_entry(&exported->active_attached->list,
+ struct attachment_list, list);
+
+ sgtl = kcalloc(1, sizeof(*sgtl), GFP_KERNEL);
+
+ if (!sgtl)
+ return -ENOMEM;
+
+ sgtl->sgt = dma_buf_map_attachment(attachl->attach,
+ DMA_BIDIRECTIONAL);
+ if (!sgtl->sgt) {
+ kfree(sgtl);
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_MAP\n");
+ return -ENOMEM;
+ }
+ list_add(&sgtl->list, &exported->active_sgts->list);
+ break;
+
+ case HYPER_DMABUF_OPS_UNMAP:
+ if (list_empty(&exported->active_sgts->list) ||
+ list_empty(&exported->active_attached->list)) {
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_UNMAP\n");
+ dev_err(hy_drv_priv->dev,
+ "no SGT or attach left to be unmapped\n");
+ return -EFAULT;
+ }
+
+ attachl = list_first_entry(&exported->active_attached->list,
+ struct attachment_list, list);
+ sgtl = list_first_entry(&exported->active_sgts->list,
+ struct sgt_list, list);
+
+ dma_buf_unmap_attachment(attachl->attach, sgtl->sgt,
+ DMA_BIDIRECTIONAL);
+ list_del(&sgtl->list);
+ kfree(sgtl);
+ break;
+
+ case HYPER_DMABUF_OPS_RELEASE:
+ dev_dbg(hy_drv_priv->dev,
+ "id:%d key:%d %d %d} released, ref left: %d\n",
+ exported->hid.id, exported->hid.rng_key[0],
+ exported->hid.rng_key[1], exported->hid.rng_key[2],
+ exported->active - 1);
+
+ exported->active--;
+
+ /* If there are still importers just break, if no then
+ * continue with final cleanup
+ */
+ if (exported->active)
+ break;
+
+ /* Importer just released buffer fd, check if there is
+ * any other importer still using it.
+ * If not and buffer was unexported, clean up shared
+ * data and remove that buffer.
+ */
+ dev_dbg(hy_drv_priv->dev,
+ "Buffer {id:%d key:%d %d %d} final released\n",
+ exported->hid.id, exported->hid.rng_key[0],
+ exported->hid.rng_key[1], exported->hid.rng_key[2]);
+
+ if (!exported->valid && !exported->active &&
+ !exported->unexport_sched) {
+ hyper_dmabuf_cleanup_sgt_info(exported, false);
+ hyper_dmabuf_remove_exported(hid);
+ kfree(exported);
+ /* store hyper_dmabuf_id in the list for reuse */
+ hyper_dmabuf_store_hid(hid);
+ }
+
+ break;
+
+ case HYPER_DMABUF_OPS_BEGIN_CPU_ACCESS:
+ ret = dma_buf_begin_cpu_access(exported->dma_buf,
+ DMA_BIDIRECTIONAL);
+ if (ret) {
+ dev_err(hy_drv_priv->dev,
+ "HYPER_DMABUF_OPS_BEGIN_CPU_ACCESS\n");
+ return ret;
+ }
+ break;
+
+ case HYPER_DMABUF_OPS_END_CPU_ACCESS:
+ ret = dma_buf_end_cpu_access(exported->dma_buf,
+ DMA_BIDIRECTIONAL);
+ if (ret) {
+ dev_err(hy_drv_priv->dev,
+ "HYPER_DMABUF_OPS_END_CPU_ACCESS\n");
+ return ret;
+ }
+ break;
+
+ case HYPER_DMABUF_OPS_KMAP_ATOMIC:
+ case HYPER_DMABUF_OPS_KMAP:
+ va_kmapl = kcalloc(1, sizeof(*va_kmapl), GFP_KERNEL);
+ if (!va_kmapl)
+ return -ENOMEM;
+
+ /* dummy kmapping of 1 page */
+ if (ops == HYPER_DMABUF_OPS_KMAP_ATOMIC)
+ va_kmapl->vaddr = dma_buf_kmap_atomic(
+ exported->dma_buf, 1);
+ else
+ va_kmapl->vaddr = dma_buf_kmap(
+ exported->dma_buf, 1);
+
+ if (!va_kmapl->vaddr) {
+ kfree(va_kmapl);
+ dev_err(hy_drv_priv->dev,
+ "HYPER_DMABUF_OPS_KMAP(_ATOMIC)\n");
+ return -ENOMEM;
+ }
+ list_add(&va_kmapl->list, &exported->va_kmapped->list);
+ break;
+
+ case HYPER_DMABUF_OPS_KUNMAP_ATOMIC:
+ case HYPER_DMABUF_OPS_KUNMAP:
+ if (list_empty(&exported->va_kmapped->list)) {
+ dev_err(hy_drv_priv->dev,
+ "HYPER_DMABUF_OPS_KUNMAP(_ATOMIC)\n");
+ dev_err(hy_drv_priv->dev,
+ "no more dmabuf VA to be freed\n");
+ return -EFAULT;
+ }
+
+ va_kmapl = list_first_entry(&exported->va_kmapped->list,
+ struct kmap_vaddr_list, list);
+ if (!va_kmapl->vaddr) {
+ dev_err(hy_drv_priv->dev,
+ "HYPER_DMABUF_OPS_KUNMAP(_ATOMIC)\n");
+ return PTR_ERR(va_kmapl->vaddr);
+ }
+
+ /* unmapping 1 page */
+ if (ops == HYPER_DMABUF_OPS_KUNMAP_ATOMIC)
+ dma_buf_kunmap_atomic(exported->dma_buf,
+ 1, va_kmapl->vaddr);
+ else
+ dma_buf_kunmap(exported->dma_buf,
+ 1, va_kmapl->vaddr);
+
+ list_del(&va_kmapl->list);
+ kfree(va_kmapl);
+ break;
+
+ case HYPER_DMABUF_OPS_MMAP:
+ /* currently not supported: looking for a way to create
+ * a dummy vma
+ */
+ dev_warn(hy_drv_priv->dev,
+ "remote sync::sychronized mmap is not supported\n");
+ break;
+
+ case HYPER_DMABUF_OPS_VMAP:
+ va_vmapl = kcalloc(1, sizeof(*va_vmapl), GFP_KERNEL);
+
+ if (!va_vmapl)
+ return -ENOMEM;
+
+ /* dummy vmapping */
+ va_vmapl->vaddr = dma_buf_vmap(exported->dma_buf);
+
+ if (!va_vmapl->vaddr) {
+ kfree(va_vmapl);
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_VMAP\n");
+ return -ENOMEM;
+ }
+ list_add(&va_vmapl->list, &exported->va_vmapped->list);
+ break;
+
+ case HYPER_DMABUF_OPS_VUNMAP:
+ if (list_empty(&exported->va_vmapped->list)) {
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_VUNMAP\n");
+ dev_err(hy_drv_priv->dev,
+ "no more dmabuf VA to be freed\n");
+ return -EFAULT;
+ }
+ va_vmapl = list_first_entry(&exported->va_vmapped->list,
+ struct vmap_vaddr_list, list);
+ if (!va_vmapl || va_vmapl->vaddr == NULL) {
+ dev_err(hy_drv_priv->dev,
+ "remote sync::HYPER_DMABUF_OPS_VUNMAP\n");
+ return -EFAULT;
+ }
+
+ dma_buf_vunmap(exported->dma_buf, va_vmapl->vaddr);
+
+ list_del(&va_vmapl->list);
+ kfree(va_vmapl);
+ break;
+
+ default:
+ /* program should not get here */
+ break;
+ }
+
+ return 0;
+}
diff --git a/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.h b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.h
new file mode 100644
index 000000000000..a659c83c8f27
--- /dev/null
+++ b/drivers/dma-buf/hyper_dmabuf/hyper_dmabuf_remote_sync.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * SPDX-License-Identifier: (MIT OR GPL-2.0)
+ *
+ */
+
+#ifndef __HYPER_DMABUF_REMOTE_SYNC_H__
+#define __HYPER_DMABUF_REMOTE_SYNC_H__
+
+int hyper_dmabuf_remote_sync(hyper_dmabuf_id_t hid, int ops);
+
+#endif // __HYPER_DMABUF_REMOTE_SYNC_H__
--
2.16.1
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