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Subject[RFC PATCH 03/60] hyper_dmabuf: re-use dma_buf previously exported if exist
Date
Now we re-use dma_buf instead of exporting it via normal process
(including new mappings). For this, hyper_dmabuf list entries can
be searched with "struct dma_buf*". Also, ioctl (export_remote) is
modified to just return hyper_dmabuf_id if the specific dmabuf
has already been exported to the target domain.

This patch also Includes changes in printk calles for debugging.

Signed-off-by: Dongwon Kim <dongwon.kim@intel.com>
---
drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c | 28 +++++++++++++--------------
drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c | 17 ++++++++--------
drivers/xen/hyper_dmabuf/hyper_dmabuf_list.c | 4 ++--
drivers/xen/hyper_dmabuf/hyper_dmabuf_list.h | 2 +-
4 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c
index faa5c1b..7cb5c35 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_imp.c
@@ -532,7 +532,7 @@ static int hyper_dmabuf_ops_attach(struct dma_buf* dmabuf, struct device* dev,
HYPER_DMABUF_OPS_ATTACH);

if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return ret;
@@ -552,7 +552,7 @@ static void hyper_dmabuf_ops_detach(struct dma_buf* dmabuf, struct dma_buf_attac
HYPER_DMABUF_OPS_DETACH);

if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}
}

@@ -586,7 +586,7 @@ static struct sg_table* hyper_dmabuf_ops_map(struct dma_buf_attachment *attachme
HYPER_DMABUF_OPS_MAP);

if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return st;
@@ -618,7 +618,7 @@ static void hyper_dmabuf_ops_unmap(struct dma_buf_attachment *attachment,
HYPER_DMABUF_OPS_UNMAP);

if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}
}

@@ -636,7 +636,7 @@ static void hyper_dmabuf_ops_release(struct dma_buf *dmabuf)
HYPER_DMABUF_OPS_RELEASE);

if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}
}

@@ -653,7 +653,7 @@ static int hyper_dmabuf_ops_begin_cpu_access(struct dma_buf *dmabuf, enum dma_da
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_BEGIN_CPU_ACCESS);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return ret;
@@ -672,7 +672,7 @@ static int hyper_dmabuf_ops_end_cpu_access(struct dma_buf *dmabuf, enum dma_data
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_END_CPU_ACCESS);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return 0;
@@ -691,7 +691,7 @@ static void *hyper_dmabuf_ops_kmap_atomic(struct dma_buf *dmabuf, unsigned long
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_KMAP_ATOMIC);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return NULL; /* for now NULL.. need to return the address of mapped region */
@@ -710,7 +710,7 @@ static void hyper_dmabuf_ops_kunmap_atomic(struct dma_buf *dmabuf, unsigned long
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_KUNMAP_ATOMIC);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}
}

@@ -727,7 +727,7 @@ static void *hyper_dmabuf_ops_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_KMAP);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return NULL; /* for now NULL.. need to return the address of mapped region */
@@ -746,7 +746,7 @@ static void hyper_dmabuf_ops_kunmap(struct dma_buf *dmabuf, unsigned long pgnum,
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_KUNMAP);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}
}

@@ -763,7 +763,7 @@ static int hyper_dmabuf_ops_mmap(struct dma_buf *dmabuf, struct vm_area_struct *
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_MMAP);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return ret;
@@ -782,7 +782,7 @@ static void *hyper_dmabuf_ops_vmap(struct dma_buf *dmabuf)
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_VMAP);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}

return NULL;
@@ -801,7 +801,7 @@ static void hyper_dmabuf_ops_vunmap(struct dma_buf *dmabuf, void *vaddr)
ret = hyper_dmabuf_sync_request_and_wait(HYPER_DMABUF_ID_IMPORTER_GET_SDOMAIN_ID(sgt_info->hyper_dmabuf_id),
HYPER_DMABUF_OPS_VUNMAP);
if (ret < 0) {
- printk("send dmabuf sync request failed\n");
+ printk("hyper_dmabuf::%s Error:send dmabuf sync request failed\n", __func__);
}
}

diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c
index 5e50908..665cada 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_ioctl.c
@@ -86,27 +86,28 @@ static int hyper_dmabuf_export_remote(void *data)
export_remote_attr = (struct ioctl_hyper_dmabuf_export_remote *)data;

dma_buf = dma_buf_get(export_remote_attr->dmabuf_fd);
+
if (!dma_buf) {
printk("Cannot get dma buf\n");
return -1;
}

- attachment = dma_buf_attach(dma_buf, hyper_dmabuf_private.device);
- if (!attachment) {
- printk("Cannot get attachment\n");
- return -1;
- }
-
/* we check if this specific attachment was already exported
* to the same domain and if yes, it returns hyper_dmabuf_id
* of pre-exported sgt */
- ret = hyper_dmabuf_find_id(attachment, export_remote_attr->remote_domain);
+ ret = hyper_dmabuf_find_id(dma_buf, export_remote_attr->remote_domain);
if (ret != -1) {
- dma_buf_detach(dma_buf, attachment);
dma_buf_put(dma_buf);
export_remote_attr->hyper_dmabuf_id = ret;
return 0;
}
+
+ attachment = dma_buf_attach(dma_buf, hyper_dmabuf_private.device);
+ if (!attachment) {
+ printk("Cannot get attachment\n");
+ return -1;
+ }
+
/* Clear ret, as that will cause whole ioctl to return failure to userspace, which is not true */
ret = 0;

diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.c b/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.c
index 77a7e65..ad2109c 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.c
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.c
@@ -65,13 +65,13 @@ struct hyper_dmabuf_sgt_info *hyper_dmabuf_find_exported(int id)
}

/* search for pre-exported sgt and return id of it if it exist */
-int hyper_dmabuf_find_id(struct dma_buf_attachment *attach, int domid)
+int hyper_dmabuf_find_id(struct dma_buf *dmabuf, int domid)
{
struct hyper_dmabuf_info_entry_exported *info_entry;
int bkt;

hash_for_each(hyper_dmabuf_hash_exported, bkt, info_entry, node)
- if(info_entry->info->attachment == attach &&
+ if(info_entry->info->attachment->dmabuf == dmabuf &&
info_entry->info->hyper_dmabuf_rdomain == domid)
return info_entry->info->hyper_dmabuf_id;

diff --git a/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.h b/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.h
index 869cd9a..463a6da 100644
--- a/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.h
+++ b/drivers/xen/hyper_dmabuf/hyper_dmabuf_list.h
@@ -25,7 +25,7 @@ int hyper_dmabuf_table_destroy(void);
int hyper_dmabuf_register_exported(struct hyper_dmabuf_sgt_info *info);

/* search for pre-exported sgt and return id of it if it exist */
-int hyper_dmabuf_find_id(struct dma_buf_attachment *attach, int domid);
+int hyper_dmabuf_find_id(struct dma_buf *dmabuf, int domid);

int hyper_dmabuf_register_imported(struct hyper_dmabuf_imported_sgt_info* info);

--
2.7.4
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