From: Sinclair Yeh <syeh@vmware.com>
Date: Wed, 5 Jul 2017 01:49:32 -0700
Subject: drm/vmwgfx: Add export fence to file descriptor support
Git-commit: c906965dee22d5e95d0651759ba107b420212a9f
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Added code to link a fence to a out_fence_fd file descriptor and
thread out_fence_fd down to vmw_execbuf_copy_fence_user() so it can be
copied into the IOCTL reply and be passed back up the the user.
v2:
Make sure to sync and clean up in case of failure
Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Deepak Singh Rawat <drawat@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 8 ++-
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 69 ++++++++++++++++++++++++++++----
drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 2
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 2
4 files changed, 70 insertions(+), 11 deletions(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -40,6 +40,7 @@
#include <drm/ttm/ttm_execbuf_util.h>
#include <drm/ttm/ttm_module.h>
#include "vmwgfx_fence.h"
+#include <linux/sync_file.h>
#define VMWGFX_DRIVER_NAME "vmwgfx"
#define VMWGFX_DRIVER_DATE "20170607"
@@ -826,7 +827,8 @@ extern int vmw_execbuf_process(struct dr
uint32_t dx_context_handle,
struct drm_vmw_fence_rep __user
*user_fence_rep,
- struct vmw_fence_obj **out_fence);
+ struct vmw_fence_obj **out_fence,
+ uint32_t flags);
extern void __vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv,
struct vmw_fence_obj *fence);
extern void vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv);
@@ -841,7 +843,9 @@ extern void vmw_execbuf_copy_fence_user(
struct drm_vmw_fence_rep __user
*user_fence_rep,
struct vmw_fence_obj *fence,
- uint32_t fence_handle);
+ uint32_t fence_handle,
+ int32_t out_fence_fd,
+ struct sync_file *sync_file);
extern int vmw_validate_single_buffer(struct vmw_private *dev_priv,
struct ttm_buffer_object *bo,
bool interruptible,
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3830,6 +3830,8 @@ int vmw_execbuf_fence_commands(struct dr
* which the information should be copied.
* @fence: Pointer to the fenc object.
* @fence_handle: User-space fence handle.
+ * @out_fence_fd: exported file descriptor for the fence. -1 if not used
+ * @sync_file: Only used to clean up in case of an error in this function.
*
* This function copies fence information to user-space. If copying fails,
* The user-space struct drm_vmw_fence_rep::error member is hopefully
@@ -3845,7 +3847,9 @@ vmw_execbuf_copy_fence_user(struct vmw_p
int ret,
struct drm_vmw_fence_rep __user *user_fence_rep,
struct vmw_fence_obj *fence,
- uint32_t fence_handle)
+ uint32_t fence_handle,
+ int32_t out_fence_fd,
+ struct sync_file *sync_file)
{
struct drm_vmw_fence_rep fence_rep;
@@ -3855,6 +3859,7 @@ vmw_execbuf_copy_fence_user(struct vmw_p
memset(&fence_rep, 0, sizeof(fence_rep));
fence_rep.error = ret;
+ fence_rep.fd = out_fence_fd;
if (ret == 0) {
BUG_ON(fence == NULL);
@@ -3877,6 +3882,14 @@ vmw_execbuf_copy_fence_user(struct vmw_p
* and unreference the handle.
*/
if (unlikely(ret != 0) && (fence_rep.error == 0)) {
+ if (sync_file)
+ fput(sync_file->file);
+
+ if (fence_rep.fd != -1) {
+ put_unused_fd(fence_rep.fd);
+ fence_rep.fd = -1;
+ }
+
ttm_ref_object_base_unref(vmw_fp->tfile,
fence_handle, TTM_REF_USAGE);
DRM_ERROR("Fence copy error. Syncing.\n");
@@ -4052,7 +4065,8 @@ int vmw_execbuf_process(struct drm_file
uint64_t throttle_us,
uint32_t dx_context_handle,
struct drm_vmw_fence_rep __user *user_fence_rep,
- struct vmw_fence_obj **out_fence)
+ struct vmw_fence_obj **out_fence,
+ uint32_t flags)
{
struct vmw_sw_context *sw_context = &dev_priv->ctx;
struct vmw_fence_obj *fence = NULL;
@@ -4062,20 +4076,33 @@ int vmw_execbuf_process(struct drm_file
struct ww_acquire_ctx ticket;
uint32_t handle;
int ret;
+ int32_t out_fence_fd = -1;
+ struct sync_file *sync_file = NULL;
+
+
+ if (flags & DRM_VMW_EXECBUF_FLAG_EXPORT_FENCE_FD) {
+ out_fence_fd = get_unused_fd_flags(O_CLOEXEC);
+ if (out_fence_fd < 0) {
+ DRM_ERROR("Failed to get a fence file descriptor.\n");
+ return out_fence_fd;
+ }
+ }
if (throttle_us) {
ret = vmw_wait_lag(dev_priv, &dev_priv->fifo.marker_queue,
throttle_us);
if (ret)
- return ret;
+ goto out_free_fence_fd;
}
kernel_commands = vmw_execbuf_cmdbuf(dev_priv, user_commands,
kernel_commands, command_size,
&header);
- if (IS_ERR(kernel_commands))
- return PTR_ERR(kernel_commands);
+ if (IS_ERR(kernel_commands)) {
+ ret = PTR_ERR(kernel_commands);
+ goto out_free_fence_fd;
+ }
ret = mutex_lock_interruptible(&dev_priv->cmdbuf_mutex);
if (ret) {
@@ -4211,8 +4238,32 @@ int vmw_execbuf_process(struct drm_file
__vmw_execbuf_release_pinned_bo(dev_priv, fence);
vmw_clear_validations(sw_context);
+
+ /*
+ * If anything fails here, give up trying to export the fence
+ * and do a sync since the user mode will not be able to sync
+ * the fence itself. This ensures we are still functionally
+ * correct.
+ */
+ if (flags & DRM_VMW_EXECBUF_FLAG_EXPORT_FENCE_FD) {
+
+ sync_file = sync_file_create(&fence->base);
+ if (!sync_file) {
+ DRM_ERROR("Unable to create sync file for fence\n");
+ put_unused_fd(out_fence_fd);
+ out_fence_fd = -1;
+
+ (void) vmw_fence_obj_wait(fence, false, false,
+ VMW_FENCE_WAIT_TIMEOUT);
+ } else {
+ /* Link the fence with the FD created earlier */
+ fd_install(out_fence_fd, sync_file->file);
+ }
+ }
+
vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv), ret,
- user_fence_rep, fence, handle);
+ user_fence_rep, fence, handle,
+ out_fence_fd, sync_file);
/* Don't unreference when handing fence out */
if (unlikely(out_fence != NULL)) {
@@ -4263,6 +4314,9 @@ out_unlock:
out_free_header:
if (header)
vmw_cmdbuf_header_free(header);
+out_free_fence_fd:
+ if (out_fence_fd >= 0)
+ put_unused_fd(out_fence_fd);
return ret;
}
@@ -4479,7 +4533,8 @@ int vmw_execbuf_ioctl(struct drm_device
NULL, arg.command_size, arg.throttle_us,
arg.context_handle,
(void __user *)(unsigned long)arg.fence_rep,
- NULL);
+ NULL,
+ arg.flags);
ttm_read_unlock(&dev_priv->reservation_sem);
if (unlikely(ret != 0))
goto out;
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
@@ -1150,7 +1150,7 @@ int vmw_fence_event_ioctl(struct drm_dev
}
vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
- handle);
+ handle, -1, NULL);
vmw_fence_obj_unreference(&fence);
return 0;
out_no_create:
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -2518,7 +2518,7 @@ void vmw_kms_helper_buffer_finish(struct
if (file_priv)
vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv),
ret, user_fence_rep, fence,
- handle);
+ handle, -1, NULL);
if (out_fence)
*out_fence = fence;
else