nouveau: take extra push space into account for pushbuf_space calls

Ever since a long time ago when I messed around with fences, I ensure
that after a PUSH_SPACE call there is enough space to write a fence out
into the pushbuf.

However the PUSH_SPACE macro is not all-knowing, and so sometimes we
have to invoke nouveau_pushbuf_space manually with the relocs/pushes
args set. If we don't take the extra allocation from PUSH_SPACE into
account, then we will end up accidentally flushing when the code was not
expecting a flush. This can lead to various runtime and rendering
failures.

The amount of extra allocation isn't that important - it has to be at
least 8 based on the current nouveau_winsys.h setting, but even more
won't hurt. I just rounded up to powers of 2.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99354
Cc: "12.0 13.0" <[email protected]>
Signed-off-by: Ilia Mirkin <[email protected]>
Acked-by: Ben Skeggs <[email protected]>

15 files changed, 26 insertions, 56 deletions

diff --git a/src/gallium/drivers/nouveau/nouveau_video.c b/src/gallium/drivers/nouveau/nouveau_video.c
index bb3aad784c5..95d8866bae8 100644
--- a/src/gallium/drivers/nouveau/nouveau_video.c
+++ b/src/gallium/drivers/nouveau/nouveau_video.c
@@ -73,7 +73,7 @@ nouveau_vpe_fini(struct nouveau_decoder *dec) {
    if (!dec->cmds)
       return;
 
-   nouveau_pushbuf_space(push, 8, 2, 0);
+   nouveau_pushbuf_space(push, 16, 2, 0);
    nouveau_bufctx_reset(dec->bufctx, NV31_VIDEO_BIND_CMD);
 
 #define BCTX_ARGS dec->bufctx, NV31_VIDEO_BIND_CMD, NOUVEAU_BO_RD
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_clear.c b/src/gallium/drivers/nouveau/nv30/nv30_clear.c
index 4217bca6da0..4e6df1eff60 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_clear.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_clear.c
@@ -128,7 +128,7 @@ nv30_clear_render_target(struct pipe_context *pipe, struct pipe_surface *ps,
 
    refn.bo = mt->base.bo;
    refn.flags = NOUVEAU_BO_VRAM | NOUVEAU_BO_WR;
-   if (nouveau_pushbuf_space(push, 16, 1, 0) ||
+   if (nouveau_pushbuf_space(push, 32, 1, 0) ||
        nouveau_pushbuf_refn (push, &refn, 1))
       return;
 
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_transfer.c b/src/gallium/drivers/nouveau/nv30/nv30_transfer.c
index e4b9497259f..6f06ee6b1c4 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_transfer.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_transfer.c
@@ -431,7 +431,7 @@ nv30_transfer_rect_sifm(XFER_ARGS)
       si_arg |= NV03_SIFM_FORMAT_FILTER_BILINEAR;
    }
 
-   if (nouveau_pushbuf_space(push, 32, 6, 0) ||
+   if (nouveau_pushbuf_space(push, 64, 6, 0) ||
        nouveau_pushbuf_refn (push, refs, 2))
       return;
 
@@ -516,7 +516,7 @@ nv30_transfer_rect_m2mf(XFER_ARGS)
    while (h) {
       unsigned lines = (h > 2047) ? 2047 : h;
 
-      if (nouveau_pushbuf_space(push, 13, 2, 0) ||
+      if (nouveau_pushbuf_space(push, 32, 2, 0) ||
           nouveau_pushbuf_refn (push, refs, 2))
          return;
 
@@ -708,7 +708,7 @@ nv30_transfer_copy_data(struct nouveau_context *nv,
       lines  = (pages > 2047) ? 2047 : pages;
       pages -= lines;
 
-      if (nouveau_pushbuf_space(push, 13, 2, 0) ||
+      if (nouveau_pushbuf_space(push, 32, 2, 0) ||
           nouveau_pushbuf_refn (push, refs, 2))
          return;
 
@@ -732,7 +732,7 @@ nv30_transfer_copy_data(struct nouveau_context *nv,
    }
 
    if (size) {
-      if (nouveau_pushbuf_space(push, 13, 2, 0) ||
+      if (nouveau_pushbuf_space(push, 32, 2, 0) ||
           nouveau_pushbuf_refn (push, refs, 2))
          return;
 
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_surface.c b/src/gallium/drivers/nouveau/nv50/nv50_surface.c
index a6c0bbc2671..f5fa9d6cada 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_surface.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_surface.c
@@ -295,7 +295,7 @@ nv50_clear_render_target(struct pipe_context *pipe,
    PUSH_DATAf(push, color->f[2]);
    PUSH_DATAf(push, color->f[3]);
 
-   if (nouveau_pushbuf_space(push, 32 + sf->depth, 1, 0))
+   if (nouveau_pushbuf_space(push, 64 + sf->depth, 1, 0))
       return;
 
    PUSH_REFN(push, bo, mt->base.domain | NOUVEAU_BO_WR);
@@ -394,7 +394,7 @@ nv50_clear_depth_stencil(struct pipe_context *pipe,
       mode |= NV50_3D_CLEAR_BUFFERS_S;
    }
 
-   if (nouveau_pushbuf_space(push, 32 + sf->depth, 1, 0))
+   if (nouveau_pushbuf_space(push, 64 + sf->depth, 1, 0))
       return;
 
    PUSH_REFN(push, bo, mt->base.domain | NOUVEAU_BO_WR);
@@ -752,7 +752,7 @@ nv50_clear_buffer(struct pipe_context *pipe,
    PUSH_DATAf(push, color.f[2]);
    PUSH_DATAf(push, color.f[3]);
 
-   if (nouveau_pushbuf_space(push, 32, 1, 0))
+   if (nouveau_pushbuf_space(push, 64, 1, 0))
       return;
 
    PUSH_REFN(push, buf->bo, buf->domain | NOUVEAU_BO_WR);
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_vbo.c b/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
index d608e7bef9d..4c46ed020a5 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_vbo.c
@@ -636,7 +636,7 @@ nv50_draw_elements(struct nv50_context *nv50, bool shorten,
          BEGIN_NV04(push, NV50_3D(VERTEX_BEGIN_GL), 1);
          PUSH_DATA (push, prim);
 
-         nouveau_pushbuf_space(push, 8, 0, 1);
+         nouveau_pushbuf_space(push, 16, 0, 1);
          PUSH_REFN(push, buf->bo, NOUVEAU_BO_RD | buf->domain);
 
          switch (index_size) {
diff --git a/src/gallium/drivers/nouveau/nv50/nv98_video.c b/src/gallium/drivers/nouveau/nv50/nv98_video.c
index 177a7e0274b..92526d9f643 100644
--- a/src/gallium/drivers/nouveau/nv50/nv98_video.c
+++ b/src/gallium/drivers/nouveau/nv50/nv98_video.c
@@ -273,7 +273,7 @@ nv98_create_decoder(struct pipe_context *context,
    dec->comm = (struct comm *)(dec->fence_map + (COMM_OFFSET/sizeof(*dec->fence_map)));
 
    /* So lets test if the fence is working? */
-   nouveau_pushbuf_space(push[0], 6, 1, 0);
+   nouveau_pushbuf_space(push[0], 16, 1, 0);
    PUSH_REFN (push[0], dec->fence_bo, NOUVEAU_BO_GART|NOUVEAU_BO_RDWR);
    BEGIN_NV04(push[0], SUBC_BSP(0x240), 3);
    PUSH_DATAh(push[0], dec->fence_bo->offset);
@@ -284,7 +284,7 @@ nv98_create_decoder(struct pipe_context *context,
    PUSH_DATA (push[0], 0);
    PUSH_KICK (push[0]);
 
-   nouveau_pushbuf_space(push[1], 6, 1, 0);
+   nouveau_pushbuf_space(push[1], 16, 1, 0);
    PUSH_REFN (push[1], dec->fence_bo, NOUVEAU_BO_GART|NOUVEAU_BO_RDWR);
    BEGIN_NV04(push[1], SUBC_VP(0x240), 3);
    PUSH_DATAh(push[1], (dec->fence_bo->offset + 0x10));
@@ -295,7 +295,7 @@ nv98_create_decoder(struct pipe_context *context,
    PUSH_DATA (push[1], 0);
    PUSH_KICK (push[1]);
 
-   nouveau_pushbuf_space(push[2], 6, 1, 0);
+   nouveau_pushbuf_space(push[2], 16, 1, 0);
    PUSH_REFN (push[2], dec->fence_bo, NOUVEAU_BO_GART|NOUVEAU_BO_RDWR);
    BEGIN_NV04(push[2], SUBC_PPP(0x240), 3);
    PUSH_DATAh(push[2], (dec->fence_bo->offset + 0x20));
diff --git a/src/gallium/drivers/nouveau/nv50/nv98_video_bsp.c b/src/gallium/drivers/nouveau/nv50/nv98_video_bsp.c
index 4fe0e05c96b..f77258de850 100644
--- a/src/gallium/drivers/nouveau/nv50/nv98_video_bsp.c
+++ b/src/gallium/drivers/nouveau/nv50/nv98_video_bsp.c
@@ -47,7 +47,6 @@ nv98_decoder_bsp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    int ret;
    struct nouveau_bo *bsp_bo = dec->bsp_bo[comm_seq % NOUVEAU_VP3_VIDEO_QDEPTH];
    struct nouveau_bo *inter_bo = dec->inter_bo[comm_seq & 1];
-   unsigned fence_extra = 0;
    struct nouveau_pushbuf_refn bo_refs[] = {
       { bsp_bo, NOUVEAU_BO_RD | NOUVEAU_BO_VRAM },
       { inter_bo, NOUVEAU_BO_WR | NOUVEAU_BO_VRAM },
@@ -61,10 +60,6 @@ nv98_decoder_bsp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    if (!dec->bitplane_bo)
       num_refs--;
 
-#if NOUVEAU_VP3_DEBUG_FENCE
-   fence_extra = 4;
-#endif
-
    bsp_size = NOUVEAU_VP3_BSP_RESERVED_SIZE;
    for (i = 0; i < num_buffers; i++)
       bsp_size += num_bytes[i];
@@ -112,7 +107,7 @@ nv98_decoder_bsp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
 
    nouveau_vp3_vp_caps(dec, desc, target, comm_seq, vp_caps, is_ref, refs);
 
-   nouveau_pushbuf_space(push, 6 + (codec == PIPE_VIDEO_FORMAT_MPEG4_AVC ? 9 : 8) + fence_extra + 2, num_refs, 0);
+   nouveau_pushbuf_space(push, 32, num_refs, 0);
    nouveau_pushbuf_refn(push, bo_refs, num_refs);
 
    bsp_addr = bsp_bo->offset >> 8;
diff --git a/src/gallium/drivers/nouveau/nv50/nv98_video_ppp.c b/src/gallium/drivers/nouveau/nv50/nv98_video_ppp.c
index 48f16211afc..3fce65ba55b 100644
--- a/src/gallium/drivers/nouveau/nv50/nv98_video_ppp.c
+++ b/src/gallium/drivers/nouveau/nv50/nv98_video_ppp.c
@@ -93,13 +93,8 @@ nv98_decoder_ppp(struct nouveau_vp3_decoder *dec, union pipe_desc desc, struct n
    enum pipe_video_format codec = u_reduce_video_profile(dec->base.profile);
    struct nouveau_pushbuf *push = dec->pushbuf[2];
    unsigned ppp_caps = 0x10;
-   unsigned fence_extra = 0;
 
-#if NOUVEAU_VP3_DEBUG_FENCE
-   fence_extra = 4;
-#endif
-
-   nouveau_pushbuf_space(push, 11 + (codec == PIPE_VIDEO_FORMAT_VC1 ? 2 : 0) + 3 + fence_extra + 2, 4, 0);
+   nouveau_pushbuf_space(push, 32, 4, 0);
 
    switch (codec) {
    case PIPE_VIDEO_FORMAT_MPEG12: {
diff --git a/src/gallium/drivers/nouveau/nv50/nv98_video_vp.c b/src/gallium/drivers/nouveau/nv50/nv98_video_vp.c
index 37d7d443289..f1cdf168ed4 100644
--- a/src/gallium/drivers/nouveau/nv50/nv98_video_vp.c
+++ b/src/gallium/drivers/nouveau/nv50/nv98_video_vp.c
@@ -76,7 +76,7 @@ nv98_decoder_vp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    enum pipe_video_format codec = u_reduce_video_profile(dec->base.profile);
    struct nouveau_bo *bsp_bo = dec->bsp_bo[comm_seq % NOUVEAU_VP3_VIDEO_QDEPTH];
    struct nouveau_bo *inter_bo = dec->inter_bo[comm_seq & 1];
-   u32 fence_extra = 0, codec_extra = 0;
+   u32 codec_extra = 0;
    struct nouveau_pushbuf_refn bo_refs[] = {
       { inter_bo, NOUVEAU_BO_WR | NOUVEAU_BO_VRAM },
       { dec->ref_bo, NOUVEAU_BO_WR | NOUVEAU_BO_VRAM },
@@ -88,10 +88,6 @@ nv98_decoder_vp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    };
    int num_refs = ARRAY_SIZE(bo_refs) - !dec->fw_bo;
 
-#if NOUVEAU_VP3_DEBUG_FENCE
-   fence_extra = 4;
-#endif
-
    if (codec == PIPE_VIDEO_FORMAT_MPEG4_AVC) {
       nouveau_vp3_inter_sizes(dec, desc.h264->slice_count, &slice_size, &bucket_size, &ring_size);
       codec_extra += 2;
@@ -115,8 +111,7 @@ nv98_decoder_vp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    if (!is_ref && (dec->refs[target->valid_ref].decoded_top && dec->refs[target->valid_ref].decoded_bottom))
       nv98_decoder_kick_ref(dec, target);
 
-   nouveau_pushbuf_space(push, 8 + 3 * (codec != PIPE_VIDEO_FORMAT_MPEG12) +
-              6 + codec_extra + fence_extra + 2, num_refs, 0);
+   nouveau_pushbuf_space(push, 32 + codec_extra, num_refs, 0);
 
    nouveau_pushbuf_refn(push, bo_refs, num_refs);
 
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_query_hw.c b/src/gallium/drivers/nouveau/nvc0/nvc0_query_hw.c
index 4c34593ef9c..ff20fe6355b 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_query_hw.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_query_hw.c
@@ -403,7 +403,7 @@ nvc0_hw_get_query_result_resource(struct nvc0_context *nvc0,
    if (wait && hq->state != NVC0_HW_QUERY_STATE_READY)
       nvc0_hw_query_fifo_wait(nvc0, q);
 
-   nouveau_pushbuf_space(push, 16, 2, 0);
+   nouveau_pushbuf_space(push, 32, 2, 0);
    PUSH_REFN (push, hq->bo, NOUVEAU_BO_GART | NOUVEAU_BO_RD);
    PUSH_REFN (push, buf->bo, buf->domain | NOUVEAU_BO_WR);
    BEGIN_NVC0(push, NVC0_3D(QUERY_ADDRESS_HIGH), 2);
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c b/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
index 650c736f5f2..9a3eb06bd4b 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
@@ -799,7 +799,7 @@ nvc0_draw_stream_output(struct nvc0_context *nvc0,
    }
 
    while (num_instances--) {
-      nouveau_pushbuf_space(push, 9, 0, 1);
+      nouveau_pushbuf_space(push, 16, 0, 1);
       BEGIN_NVC0(push, NVC0_3D(VERTEX_BEGIN_GL), 1);
       PUSH_DATA (push, mode);
       BEGIN_NVC0(push, NVC0_3D(DRAW_TFB_BASE), 1);
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_video.c b/src/gallium/drivers/nouveau/nvc0/nvc0_video.c
index a9fd1d20942..b5e7bba5f9e 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_video.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_video.c
@@ -297,7 +297,7 @@ nvc0_create_decoder(struct pipe_context *context,
    dec->comm = (struct comm *)(dec->fence_map + (COMM_OFFSET/sizeof(*dec->fence_map)));
 
    /* So lets test if the fence is working? */
-   nouveau_pushbuf_space(push[0], 6, 1, 0);
+   nouveau_pushbuf_space(push[0], 16, 1, 0);
    PUSH_REFN (push[0], dec->fence_bo, NOUVEAU_BO_GART|NOUVEAU_BO_RDWR);
    BEGIN_NVC0(push[0], SUBC_BSP(0x240), 3);
    PUSH_DATAh(push[0], dec->fence_bo->offset);
@@ -308,7 +308,7 @@ nvc0_create_decoder(struct pipe_context *context,
    PUSH_DATA (push[0], 0);
    PUSH_KICK (push[0]);
 
-   nouveau_pushbuf_space(push[1], 6, 1, 0);
+   nouveau_pushbuf_space(push[1], 16, 1, 0);
    PUSH_REFN (push[1], dec->fence_bo, NOUVEAU_BO_GART|NOUVEAU_BO_RDWR);
    BEGIN_NVC0(push[1], SUBC_VP(0x240), 3);
    PUSH_DATAh(push[1], (dec->fence_bo->offset + 0x10));
@@ -319,7 +319,7 @@ nvc0_create_decoder(struct pipe_context *context,
    PUSH_DATA (push[1], 0);
    PUSH_KICK (push[1]);
 
-   nouveau_pushbuf_space(push[2], 6, 1, 0);
+   nouveau_pushbuf_space(push[2], 16, 1, 0);
    PUSH_REFN (push[2], dec->fence_bo, NOUVEAU_BO_GART|NOUVEAU_BO_RDWR);
    BEGIN_NVC0(push[2], SUBC_PPP(0x240), 3);
    PUSH_DATAh(push[2], (dec->fence_bo->offset + 0x20));
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_video_bsp.c b/src/gallium/drivers/nouveau/nvc0/nvc0_video_bsp.c
index af072a8acdc..52a031c519a 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_video_bsp.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_video_bsp.c
@@ -143,7 +143,6 @@ nvc0_decoder_bsp_end(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    uint32_t caps;
    struct nouveau_bo *bsp_bo = dec->bsp_bo[comm_seq % NOUVEAU_VP3_VIDEO_QDEPTH];
    struct nouveau_bo *inter_bo = dec->inter_bo[comm_seq & 1];
-   unsigned fence_extra = 0;
    struct nouveau_pushbuf_refn bo_refs[] = {
       { bsp_bo, NOUVEAU_BO_RD | NOUVEAU_BO_VRAM },
       { inter_bo, NOUVEAU_BO_WR | NOUVEAU_BO_VRAM },
@@ -157,15 +156,11 @@ nvc0_decoder_bsp_end(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    if (!dec->bitplane_bo)
       num_refs--;
 
-#if NOUVEAU_VP3_DEBUG_FENCE
-   fence_extra = 4;
-#endif
-
    caps = nouveau_vp3_bsp_end(dec, desc);
 
    nouveau_vp3_vp_caps(dec, desc, target, comm_seq, vp_caps, is_ref, refs);
 
-   nouveau_pushbuf_space(push, 6 + (codec == PIPE_VIDEO_FORMAT_MPEG4_AVC ? 9 : 7) + fence_extra + 2, num_refs, 0);
+   nouveau_pushbuf_space(push, 32, num_refs, 0);
    nouveau_pushbuf_refn(push, bo_refs, num_refs);
 
    bsp_addr = bsp_bo->offset >> 8;
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_video_ppp.c b/src/gallium/drivers/nouveau/nvc0/nvc0_video_ppp.c
index e4504e6c411..4f058628e31 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_video_ppp.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_video_ppp.c
@@ -93,13 +93,8 @@ nvc0_decoder_ppp(struct nouveau_vp3_decoder *dec, union pipe_desc desc, struct n
    enum pipe_video_format codec = u_reduce_video_profile(dec->base.profile);
    struct nouveau_pushbuf *push = dec->pushbuf[2];
    unsigned ppp_caps = 0x10;
-   unsigned fence_extra = 0;
 
-#if NOUVEAU_VP3_DEBUG_FENCE
-   fence_extra = 4;
-#endif
-
-   nouveau_pushbuf_space(push, 11 + (codec == PIPE_VIDEO_FORMAT_VC1 ? 2 : 0) + 3 + fence_extra + 2, 4, 0);
+   nouveau_pushbuf_space(push, 32, 4, 0);
 
    switch (codec) {
    case PIPE_VIDEO_FORMAT_MPEG12: {
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_video_vp.c b/src/gallium/drivers/nouveau/nvc0/nvc0_video_vp.c
index 73d55148151..3de4ec14867 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_video_vp.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_video_vp.c
@@ -76,7 +76,7 @@ nvc0_decoder_vp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    enum pipe_video_format codec = u_reduce_video_profile(dec->base.profile);
    struct nouveau_bo *bsp_bo = dec->bsp_bo[comm_seq % NOUVEAU_VP3_VIDEO_QDEPTH];
    struct nouveau_bo *inter_bo = dec->inter_bo[comm_seq & 1];
-   u32 fence_extra = 0, codec_extra = 0;
+   u32 codec_extra = 0;
    struct nouveau_pushbuf_refn bo_refs[] = {
       { inter_bo, NOUVEAU_BO_WR | NOUVEAU_BO_VRAM },
       { dec->ref_bo, NOUVEAU_BO_WR | NOUVEAU_BO_VRAM },
@@ -88,10 +88,6 @@ nvc0_decoder_vp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    };
    int num_refs = ARRAY_SIZE(bo_refs) - !dec->fw_bo;
 
-#if NOUVEAU_VP3_DEBUG_FENCE
-   fence_extra = 4;
-#endif
-
    if (codec == PIPE_VIDEO_FORMAT_MPEG4_AVC) {
       nouveau_vp3_inter_sizes(dec, desc.h264->slice_count, &slice_size, &bucket_size, &ring_size);
       codec_extra += 2;
@@ -115,8 +111,7 @@ nvc0_decoder_vp(struct nouveau_vp3_decoder *dec, union pipe_desc desc,
    if (!is_ref && (dec->refs[target->valid_ref].decoded_top && dec->refs[target->valid_ref].decoded_bottom))
       nvc0_decoder_kick_ref(dec, target);
 
-   nouveau_pushbuf_space(push, 8 + 3 * (codec != PIPE_VIDEO_FORMAT_MPEG12) +
-              6 + codec_extra + fence_extra + 2, num_refs, 0);
+   nouveau_pushbuf_space(push, 32 + codec_extra, num_refs, 0);
 
    nouveau_pushbuf_refn(push, bo_refs, num_refs);