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/********************************************************** |
* Copyright 2009-2011 VMware, Inc. All rights reserved. |
* |
* 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 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. |
* |
**********************************************************/ |
/* |
* TODO: |
* |
* Fencing is currently a bit inefficient, since we need to call the |
* kernel do determine a fence object signaled status if the fence is not |
* signaled. This can be greatly improved upon by using the fact that the |
* execbuf ioctl returns the last signaled fence seqno, as does the |
* fence signaled ioctl. We should set up a ring of fence objects and |
* walk through them checking for signaled status each time we receive a |
* new passed fence seqno. |
*/ |
|
#include "util/u_memory.h" |
#include "util/u_atomic.h" |
|
#include "pipebuffer/pb_buffer_fenced.h" |
|
#include "vmw_screen.h" |
#include "vmw_fence.h" |
|
struct vmw_fence_ops |
{ |
struct pb_fence_ops base; |
|
struct vmw_winsys_screen *vws; |
}; |
|
struct vmw_fence |
{ |
int32_t refcount; |
uint32_t handle; |
uint32_t mask; |
int32_t signalled; |
}; |
|
/** |
* vmw_fence - return the vmw_fence object identified by a |
* struct pipe_fence_handle * |
* |
* @fence: The opaque pipe fence handle. |
*/ |
static INLINE struct vmw_fence * |
vmw_fence(struct pipe_fence_handle *fence) |
{ |
return (struct vmw_fence *) fence; |
} |
|
/** |
* vmw_fence_create - Create a user-space fence object. |
* |
* @handle: Handle identifying the kernel fence object. |
* @mask: Mask of flags that this fence object may signal. |
* |
* Returns NULL on failure. |
*/ |
struct pipe_fence_handle * |
vmw_fence_create(uint32_t handle, uint32_t mask) |
{ |
struct vmw_fence *fence = CALLOC_STRUCT(vmw_fence); |
|
if (!fence) |
return NULL; |
|
p_atomic_set(&fence->refcount, 1); |
fence->handle = handle; |
fence->mask = mask; |
p_atomic_set(&fence->signalled, 0); |
|
return (struct pipe_fence_handle *) fence; |
} |
|
/** |
* vmw_fence_ops - Return the vmw_fence_ops structure backing a |
* struct pb_fence_ops pointer. |
* |
* @ops: Pointer to a struct pb_fence_ops. |
* |
*/ |
static INLINE struct vmw_fence_ops * |
vmw_fence_ops(struct pb_fence_ops *ops) |
{ |
assert(ops); |
return (struct vmw_fence_ops *)ops; |
} |
|
|
|
/** |
* vmw_fence_reference - Reference / unreference a vmw fence object. |
* |
* @vws: Pointer to the winsys screen. |
* @ptr: Pointer to reference transfer destination. |
* @fence: Pointer to object to reference. May be NULL. |
*/ |
void |
vmw_fence_reference(struct vmw_winsys_screen *vws, |
struct pipe_fence_handle **ptr, |
struct pipe_fence_handle *fence) |
{ |
if (*ptr) { |
struct vmw_fence *vfence = vmw_fence(*ptr); |
|
if (p_atomic_dec_zero(&vfence->refcount)) { |
vmw_ioctl_fence_unref(vws, vfence->handle); |
FREE(vfence); |
} |
} |
|
if (fence) { |
struct vmw_fence *vfence = vmw_fence(fence); |
|
p_atomic_inc(&vfence->refcount); |
} |
|
*ptr = fence; |
} |
|
|
/** |
* vmw_fence_signalled - Check whether a fence object is signalled. |
* |
* @vws: Pointer to the winsys screen. |
* @fence: Handle to the fence object. |
* @flag: Fence flags to check. If the fence object can't signal |
* a flag, it is assumed to be already signaled. |
* |
* Returns 0 if the fence object was signaled, nonzero otherwise. |
*/ |
int |
vmw_fence_signalled(struct vmw_winsys_screen *vws, |
struct pipe_fence_handle *fence, |
unsigned flag) |
{ |
struct vmw_fence *vfence; |
int32_t vflags = SVGA_FENCE_FLAG_EXEC; |
int ret; |
uint32_t old; |
|
if (!fence) |
return 0; |
|
vfence = vmw_fence(fence); |
old = p_atomic_read(&vfence->signalled); |
|
vflags &= ~vfence->mask; |
|
if ((old & vflags) == vflags) |
return 0; |
|
ret = vmw_ioctl_fence_signalled(vws, vfence->handle, vflags); |
|
if (ret == 0) { |
int32_t prev = old; |
|
do { |
old = prev; |
prev = p_atomic_cmpxchg(&vfence->signalled, old, old | vflags); |
} while (prev != old); |
} |
|
return ret; |
} |
|
/** |
* vmw_fence_finish - Wait for a fence object to signal. |
* |
* @vws: Pointer to the winsys screen. |
* @fence: Handle to the fence object. |
* @flag: Fence flags to wait for. If the fence object can't signal |
* a flag, it is assumed to be already signaled. |
* |
* Returns 0 if the wait succeeded. Nonzero otherwise. |
*/ |
int |
vmw_fence_finish(struct vmw_winsys_screen *vws, |
struct pipe_fence_handle *fence, |
unsigned flag) |
{ |
struct vmw_fence *vfence; |
int32_t vflags = SVGA_FENCE_FLAG_EXEC; |
int ret; |
uint32_t old; |
|
if (!fence) |
return 0; |
|
vfence = vmw_fence(fence); |
old = p_atomic_read(&vfence->signalled); |
vflags &= ~vfence->mask; |
|
if ((old & vflags) == vflags) |
return 0; |
|
ret = vmw_ioctl_fence_finish(vws, vfence->handle, vflags); |
|
if (ret == 0) { |
int32_t prev = old; |
|
do { |
old = prev; |
prev = p_atomic_cmpxchg(&vfence->signalled, old, old | vflags); |
} while (prev != old); |
} |
|
return ret; |
} |
|
|
/** |
* vmw_fence_ops_fence_reference - wrapper for the pb_fence_ops api. |
* |
* wrapper around vmw_fence_reference. |
*/ |
static void |
vmw_fence_ops_fence_reference(struct pb_fence_ops *ops, |
struct pipe_fence_handle **ptr, |
struct pipe_fence_handle *fence) |
{ |
struct vmw_winsys_screen *vws = vmw_fence_ops(ops)->vws; |
|
vmw_fence_reference(vws, ptr, fence); |
} |
|
/** |
* vmw_fence_ops_fence_signalled - wrapper for the pb_fence_ops api. |
* |
* wrapper around vmw_fence_signalled. |
*/ |
static int |
vmw_fence_ops_fence_signalled(struct pb_fence_ops *ops, |
struct pipe_fence_handle *fence, |
unsigned flag) |
{ |
struct vmw_winsys_screen *vws = vmw_fence_ops(ops)->vws; |
|
return vmw_fence_signalled(vws, fence, flag); |
} |
|
|
/** |
* vmw_fence_ops_fence_finish - wrapper for the pb_fence_ops api. |
* |
* wrapper around vmw_fence_finish. |
*/ |
static int |
vmw_fence_ops_fence_finish(struct pb_fence_ops *ops, |
struct pipe_fence_handle *fence, |
unsigned flag) |
{ |
struct vmw_winsys_screen *vws = vmw_fence_ops(ops)->vws; |
|
return vmw_fence_finish(vws, fence, flag); |
} |
|
|
/** |
* vmw_fence_ops_destroy - Destroy a pb_fence_ops function table. |
* |
* @ops: The function table to destroy. |
* |
* Part of the pb_fence_ops api. |
*/ |
static void |
vmw_fence_ops_destroy(struct pb_fence_ops *ops) |
{ |
FREE(ops); |
} |
|
|
/** |
* vmw_fence_ops_create - Create a pb_fence_ops function table. |
* |
* @vws: Pointer to a struct vmw_winsys_screen. |
* |
* Returns a pointer to a pb_fence_ops function table to interface |
* with pipe_buffer. This function is typically called on driver setup. |
* |
* Returns NULL on failure. |
*/ |
struct pb_fence_ops * |
vmw_fence_ops_create(struct vmw_winsys_screen *vws) |
{ |
struct vmw_fence_ops *ops; |
|
ops = CALLOC_STRUCT(vmw_fence_ops); |
if(!ops) |
return NULL; |
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ops->base.destroy = &vmw_fence_ops_destroy; |
ops->base.fence_reference = &vmw_fence_ops_fence_reference; |
ops->base.fence_signalled = &vmw_fence_ops_fence_signalled; |
ops->base.fence_finish = &vmw_fence_ops_fence_finish; |
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ops->vws = vws; |
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return &ops->base; |
} |
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