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drm/nouveau: use ttm_bo_reserve_slowpath in validate_init, v2

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Similar rationale to the identical commit in drm/ttm.
Instead of only waiting for unreservation, we make sure we actually
own the reservation, then retry to get the rest.

Changes since v1:
 - Increase the seqno before calling ttm_bo_reserve_slowpath

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
This commit is contained in:
Maarten Lankhorst 2013-01-15 14:57:20 +01:00
parent f2d476a110
commit c354c893dd
1 changed files with 17 additions and 5 deletions
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22
drivers/gpu/drm/nouveau/nouveau_gem.c
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@ -320,9 +320,10 @@ validate_init(struct nouveau_channel *chan, struct drm_file *file_priv,
uint32_t sequence;
int trycnt = 0;
int ret, i;
struct nouveau_bo *res_bo = NULL;
retry:
sequence = atomic_add_return(1, &drm->ttm.validate_sequence);
retry:
if (++trycnt > 100000) {
NV_ERROR(drm, "%s failed and gave up.\n", __func__);
return -EINVAL;
@ -340,6 +341,11 @@ retry:
return -ENOENT;
}
nvbo = gem->driver_private;
if (nvbo == res_bo) {
res_bo = NULL;
drm_gem_object_unreference_unlocked(gem);
continue;
}
if (nvbo->reserved_by && nvbo->reserved_by == file_priv) {
NV_ERROR(drm, "multiple instances of buffer %d on "
@ -352,15 +358,19 @@ retry:
ret = ttm_bo_reserve(&nvbo->bo, true, false, true, sequence);
if (ret) {
validate_fini(op, NULL);
if (unlikely(ret == -EAGAIN))
ret = ttm_bo_wait_unreserved(&nvbo->bo, true);
drm_gem_object_unreference_unlocked(gem);
if (unlikely(ret == -EAGAIN)) {
sequence = atomic_add_return(1, &drm->ttm.validate_sequence);
ret = ttm_bo_reserve_slowpath(&nvbo->bo, true,
sequence);
if (!ret)
res_bo = nvbo;
}
if (unlikely(ret)) {
drm_gem_object_unreference_unlocked(gem);
if (ret != -ERESTARTSYS)
NV_ERROR(drm, "fail reserve\n");
return ret;
}
goto retry;
}
b->user_priv = (uint64_t)(unsigned long)nvbo;
@ -382,6 +392,8 @@ retry:
validate_fini(op, NULL);
return -EINVAL;
}
if (nvbo == res_bo)
goto retry;
}
return 0;