Merge tag 'drm-next-2022-12-13' of git://anongit.freedesktop.org/drm/drm

Pull drm updates from Dave Airlie:
 "The biggest highlight is that the accel subsystem framework is merged.
  Hopefully for 6.3 we will be able to line up a driver to use it.

  In drivers land, i915 enables DG2 support by default now, and nouveau
  has a big stability refactoring and initial ampere support, AMD
  includes new hw IP support and should build on ARM again. There is
  also an ofdrm driver to take over offb on platforms it's used.

  Stuff outside my tree, the dma-buf patches hit a few places, the vc4
  firmware changes also do, and i915 has some interactions with MEI for
  discrete GPUs. I think all of those should have been acked/reviewed by
  relevant parties.

  New driver:
   - ofdrm - replacement for offb

  fbdev:
   - add support for nomodeset

  fourcc:
   - add Vivante tiled modifier

  core:
   - atomic-helpers: CRTC primary plane test fixes, fb access hooks
   - connector: TV API consistency, cmdline parser improvements
   - send connector hotplug on cleanup
   - sort makefile objects

  tests:
   - sort kunit tests
   - improve DP-MST tests
   - add kunit helpers to create a device

  sched:
   - module param for scheduling policy
   - refcounting fix

  buddy:
   - add back random seed log

  ttm:
   - convert ttm_resource to size_t
   - optimize pool allocations

  edid:
   - HFVSDB parsing support fixes
   - logging/debug improvements
   - DSC quirks

  dma-buf:
   - Add unlocked vmap and attachment mapping
   - move drivers to common locking convention
   - locking improvements

  firmware:
   - new API for rPI firmware and vc4

  xilinx:
   - zynqmp: displayport bridge support
   - dpsub fix

  bridge:
   - adv7533: Remove dynamic lane switching
   - it6505: Runtime PM support, sync improvements
   - ps8640: Handle AUX defer messages
   - tc358775: Drop soft-reset over I2C

  panel:
   - panel-edp: Add INX N116BGE-EA2 C2 and C4 support.
   - Jadard JD9365DA-H3
   - NewVision NV3051D

  amdgpu:
   - DCN support on ARM
   - DCN 2.1 secure display
   - Sienna Cichlid mode2 reset fixes
   - new GC 11.x firmware versions
   - drop AMD specific DSC workarounds in favour of drm code
   - clang warning fixes
   - scheduler rework
   - SR-IOV fixes
   - GPUVM locking fixes
   - fix memory leak in CS IOCTL error path
   - flexible array updates
   - enable new GC/PSP/SMU/NBIO IP
   - GFX preemption support for gfx9

  amdkfd:
   - cache size fixes
   - userptr fixes
   - enable cooperative launch on gfx 10.3
   - enable GC 11.0.4 KFD support

  radeon:
   - replace kmap with kmap_local_page
   - ACPI ref count fix
   - HDA audio notifier support

  i915:
   - DG2 enabled by default
   - MTL enablement work
   - hotplug refactoring
   - VBT improvements
   - Display and watermark refactoring
   - ADL-P workaround
   - temp disable runtime_pm for discrete-
   - fix for A380 as a secondary GPU
   - Wa_18017747507 for DG2
   - CS timestamp support fixes for gen5 and earlier
   - never purge busy TTM objects
   - use i915_sg_dma_sizes for all backends
   - demote GuC kernel contexts to normal priority
   - gvt: refactor for new MDEV interface
   - enable DC power states on eDP ports
   - fix gen 2/3 workarounds

  nouveau:
   - fix page fault handling
   - Ampere acceleration support
   - driver stability improvements
   - nva3 backlight support

  msm:
   - MSM_INFO_GET_FLAGS support
   - DPU: XR30 and P010 image formats
   - Qualcomm SM6115 support
   - DSI PHY support for QCM2290
   - HDMI: refactored dev init path
   - remove exclusive-fence hack
   - fix speed-bin detection
   - enable clamp to idle on 7c3
   - improved hangcheck detection

  vmwgfx:
   - fb and cursor refactoring
   - convert to generic hashtable
   - cursor improvements

  etnaviv:
   - hw workarounds
   - softpin MMU fixes

  ast:
   - atomic gamma LUT support
   - convert to SHMEM

  lcdif:
   - support YUV planes
   - Increase DMA burst size
   - FIFO threshold tuning

  meson:
   - fix return type of cvbs mode_valid

  mgag200:
   - fix PLL setup on some revisions

  sun4i:
   - A100 and D1 support

  udl:
   - modesetting improvements
   - hot unplug support

  vc4:
   - support PAL-M
   - fix regression preventing 4K @ 60Hz
   - fix NULL ptr deref

  v3d:
   - switch to drm managed resources

  renesas:
   - RZ/G2L DSI support
   - DU Kconfig cleanup

  mediatek:
   - fixup dpi and hdmi
   - MT8188 dpi support
   - MT8195 AFBC support

  tegra:
   - NVDEC hardware on Tegra234 SoC

  hdlcd:
   - switch to drm managed resources

  ingenic:
   - fix registration error path

  hisilicon:
   - convert to drm_mode_init

  maildp:
   - use managed resources

  mtk:
   - use drm_mode_init

  rockchip:
   - use drm_mode_copy"

* tag 'drm-next-2022-12-13' of git://anongit.freedesktop.org/drm/drm: (1397 commits)
  drm/amdgpu: fix mmhub register base coding error
  drm/amdgpu: add tmz support for GC IP v11.0.4
  drm/amdgpu: enable GFX Clock Gating control for GC IP v11.0.4
  drm/amdgpu: enable GFX Power Gating for GC IP v11.0.4
  drm/amdgpu: enable GFX IP v11.0.4 CG support
  drm/amdgpu: Make amdgpu_ring_mux functions as static
  drm/amdgpu: generally allow over-commit during BO allocation
  drm/amd/display: fix array index out of bound error in DCN32 DML
  drm/amd/display: 3.2.215
  drm/amd/display: set optimized required for comp buf changes
  drm/amd/display: Add debug option to skip PSR CRTC disable
  drm/amd/display: correct DML calc error of UrgentLatency
  drm/amd/display: correct static_screen_event_mask
  drm/amd/display: Ensure commit_streams returns the DC return code
  drm/amd/display: read invalid ddc pin status cause engine busy
  drm/amd/display: Bypass DET swath fill check for max clocks
  drm/amd/display: Disable uclk pstate for subvp pipes
  drm/amd/display: Fix DCN2.1 default DSC clocks
  drm/amd/display: Enable dp_hdmi21_pcon support
  drm/amd/display: prevent seamless boot on displays that don't have the preferred dig
  ...

1 files changed, 514 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
new file mode 100644
index 000000000000..62079f0e3ee8
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
@@ -0,0 +1,514 @@
+/*
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ *
+ * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ */
+#include <linux/slab.h>
+#include <drm/drm_print.h>
+
+#include "amdgpu_ring_mux.h"
+#include "amdgpu_ring.h"
+#include "amdgpu.h"
+
+#define AMDGPU_MUX_RESUBMIT_JIFFIES_TIMEOUT (HZ / 2)
+#define AMDGPU_MAX_LAST_UNSIGNALED_THRESHOLD_US 10000
+
+static const struct ring_info {
+	unsigned int hw_pio;
+	const char *ring_name;
+} sw_ring_info[] = {
+	{ AMDGPU_RING_PRIO_DEFAULT, "gfx_low"},
+	{ AMDGPU_RING_PRIO_2, "gfx_high"},
+};
+
+static struct kmem_cache *amdgpu_mux_chunk_slab;
+
+static inline struct amdgpu_mux_entry *amdgpu_ring_mux_sw_entry(struct amdgpu_ring_mux *mux,
+								struct amdgpu_ring *ring)
+{
+	return ring->entry_index < mux->ring_entry_size ?
+			&mux->ring_entry[ring->entry_index] : NULL;
+}
+
+/* copy packages on sw ring range[begin, end) */
+static void amdgpu_ring_mux_copy_pkt_from_sw_ring(struct amdgpu_ring_mux *mux,
+						  struct amdgpu_ring *ring,
+						  u64 s_start, u64 s_end)
+{
+	u64 start, end;
+	struct amdgpu_ring *real_ring = mux->real_ring;
+
+	start = s_start & ring->buf_mask;
+	end = s_end & ring->buf_mask;
+
+	if (start == end) {
+		DRM_ERROR("no more data copied from sw ring\n");
+		return;
+	}
+	if (start > end) {
+		amdgpu_ring_alloc(real_ring, (ring->ring_size >> 2) + end - start);
+		amdgpu_ring_write_multiple(real_ring, (void *)&ring->ring[start],
+					   (ring->ring_size >> 2) - start);
+		amdgpu_ring_write_multiple(real_ring, (void *)&ring->ring[0], end);
+	} else {
+		amdgpu_ring_alloc(real_ring, end - start);
+		amdgpu_ring_write_multiple(real_ring, (void *)&ring->ring[start], end - start);
+	}
+}
+
+static void amdgpu_mux_resubmit_chunks(struct amdgpu_ring_mux *mux)
+{
+	struct amdgpu_mux_entry *e = NULL;
+	struct amdgpu_mux_chunk *chunk;
+	uint32_t seq, last_seq;
+	int i;
+
+	/*find low priority entries:*/
+	if (!mux->s_resubmit)
+		return;
+
+	for (i = 0; i < mux->num_ring_entries; i++) {
+		if (mux->ring_entry[i].ring->hw_prio <= AMDGPU_RING_PRIO_DEFAULT) {
+			e = &mux->ring_entry[i];
+			break;
+		}
+	}
+
+	if (!e) {
+		DRM_ERROR("%s no low priority ring found\n", __func__);
+		return;
+	}
+
+	last_seq = atomic_read(&e->ring->fence_drv.last_seq);
+	seq = mux->seqno_to_resubmit;
+	if (last_seq < seq) {
+		/*resubmit all the fences between (last_seq, seq]*/
+		list_for_each_entry(chunk, &e->list, entry) {
+			if (chunk->sync_seq > last_seq && chunk->sync_seq <= seq) {
+				amdgpu_fence_update_start_timestamp(e->ring,
+								    chunk->sync_seq,
+								    ktime_get());
+				amdgpu_ring_mux_copy_pkt_from_sw_ring(mux, e->ring,
+								      chunk->start,
+								      chunk->end);
+				mux->wptr_resubmit = chunk->end;
+				amdgpu_ring_commit(mux->real_ring);
+			}
+		}
+	}
+
+	del_timer(&mux->resubmit_timer);
+	mux->s_resubmit = false;
+}
+
+static void amdgpu_ring_mux_schedule_resubmit(struct amdgpu_ring_mux *mux)
+{
+	mod_timer(&mux->resubmit_timer, jiffies + AMDGPU_MUX_RESUBMIT_JIFFIES_TIMEOUT);
+}
+
+static void amdgpu_mux_resubmit_fallback(struct timer_list *t)
+{
+	struct amdgpu_ring_mux *mux = from_timer(mux, t, resubmit_timer);
+
+	if (!spin_trylock(&mux->lock)) {
+		amdgpu_ring_mux_schedule_resubmit(mux);
+		DRM_ERROR("reschedule resubmit\n");
+		return;
+	}
+	amdgpu_mux_resubmit_chunks(mux);
+	spin_unlock(&mux->lock);
+}
+
+int amdgpu_ring_mux_init(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring,
+			 unsigned int entry_size)
+{
+	mux->real_ring = ring;
+	mux->num_ring_entries = 0;
+
+	mux->ring_entry = kcalloc(entry_size, sizeof(struct amdgpu_mux_entry), GFP_KERNEL);
+	if (!mux->ring_entry)
+		return -ENOMEM;
+
+	mux->ring_entry_size = entry_size;
+	mux->s_resubmit = false;
+
+	amdgpu_mux_chunk_slab = kmem_cache_create("amdgpu_mux_chunk",
+						  sizeof(struct amdgpu_mux_chunk), 0,
+						  SLAB_HWCACHE_ALIGN, NULL);
+	if (!amdgpu_mux_chunk_slab) {
+		DRM_ERROR("create amdgpu_mux_chunk cache failed\n");
+		return -ENOMEM;
+	}
+
+	spin_lock_init(&mux->lock);
+	timer_setup(&mux->resubmit_timer, amdgpu_mux_resubmit_fallback, 0);
+
+	return 0;
+}
+
+void amdgpu_ring_mux_fini(struct amdgpu_ring_mux *mux)
+{
+	struct amdgpu_mux_entry *e;
+	struct amdgpu_mux_chunk *chunk, *chunk2;
+	int i;
+
+	for (i = 0; i < mux->num_ring_entries; i++) {
+		e = &mux->ring_entry[i];
+		list_for_each_entry_safe(chunk, chunk2, &e->list, entry) {
+			list_del(&chunk->entry);
+			kmem_cache_free(amdgpu_mux_chunk_slab, chunk);
+		}
+	}
+	kmem_cache_destroy(amdgpu_mux_chunk_slab);
+	kfree(mux->ring_entry);
+	mux->ring_entry = NULL;
+	mux->num_ring_entries = 0;
+	mux->ring_entry_size = 0;
+}
+
+int amdgpu_ring_mux_add_sw_ring(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring)
+{
+	struct amdgpu_mux_entry *e;
+
+	if (mux->num_ring_entries >= mux->ring_entry_size) {
+		DRM_ERROR("add sw ring exceeding max entry size\n");
+		return -ENOENT;
+	}
+
+	e = &mux->ring_entry[mux->num_ring_entries];
+	ring->entry_index = mux->num_ring_entries;
+	e->ring = ring;
+
+	INIT_LIST_HEAD(&e->list);
+	mux->num_ring_entries += 1;
+	return 0;
+}
+
+void amdgpu_ring_mux_set_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring, u64 wptr)
+{
+	struct amdgpu_mux_entry *e;
+
+	spin_lock(&mux->lock);
+
+	if (ring->hw_prio <= AMDGPU_RING_PRIO_DEFAULT)
+		amdgpu_mux_resubmit_chunks(mux);
+
+	e = amdgpu_ring_mux_sw_entry(mux, ring);
+	if (!e) {
+		DRM_ERROR("cannot find entry for sw ring\n");
+		spin_unlock(&mux->lock);
+		return;
+	}
+
+	/* We could skip this set wptr as preemption in process. */
+	if (ring->hw_prio <= AMDGPU_RING_PRIO_DEFAULT && mux->pending_trailing_fence_signaled) {
+		spin_unlock(&mux->lock);
+		return;
+	}
+
+	e->sw_cptr = e->sw_wptr;
+	/* Update cptr if the package already copied in resubmit functions */
+	if (ring->hw_prio <= AMDGPU_RING_PRIO_DEFAULT && e->sw_cptr < mux->wptr_resubmit)
+		e->sw_cptr = mux->wptr_resubmit;
+	e->sw_wptr = wptr;
+	e->start_ptr_in_hw_ring = mux->real_ring->wptr;
+
+	/* Skip copying for the packages already resubmitted.*/
+	if (ring->hw_prio > AMDGPU_RING_PRIO_DEFAULT || mux->wptr_resubmit < wptr) {
+		amdgpu_ring_mux_copy_pkt_from_sw_ring(mux, ring, e->sw_cptr, wptr);
+		e->end_ptr_in_hw_ring = mux->real_ring->wptr;
+		amdgpu_ring_commit(mux->real_ring);
+	} else {
+		e->end_ptr_in_hw_ring = mux->real_ring->wptr;
+	}
+	spin_unlock(&mux->lock);
+}
+
+u64 amdgpu_ring_mux_get_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring)
+{
+	struct amdgpu_mux_entry *e;
+
+	e = amdgpu_ring_mux_sw_entry(mux, ring);
+	if (!e) {
+		DRM_ERROR("cannot find entry for sw ring\n");
+		return 0;
+	}
+
+	return e->sw_wptr;
+}
+
+/**
+ * amdgpu_ring_mux_get_rptr - get the readptr of the software ring
+ * @mux: the multiplexer the software rings attach to
+ * @ring: the software ring of which we calculate the readptr
+ *
+ * The return value of the readptr is not precise while the other rings could
+ * write data onto the real ring buffer.After overwriting on the real ring, we
+ * can not decide if our packages have been excuted or not read yet. However,
+ * this function is only called by the tools such as umr to collect the latest
+ * packages for the hang analysis. We assume the hang happens near our latest
+ * submit. Thus we could use the following logic to give the clue:
+ * If the readptr is between start and end, then we return the copy pointer
+ * plus the distance from start to readptr. If the readptr is before start, we
+ * return the copy pointer. Lastly, if the readptr is past end, we return the
+ * write pointer.
+ */
+u64 amdgpu_ring_mux_get_rptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring)
+{
+	struct amdgpu_mux_entry *e;
+	u64 readp, offset, start, end;
+
+	e = amdgpu_ring_mux_sw_entry(mux, ring);
+	if (!e) {
+		DRM_ERROR("no sw entry found!\n");
+		return 0;
+	}
+
+	readp = amdgpu_ring_get_rptr(mux->real_ring);
+
+	start = e->start_ptr_in_hw_ring & mux->real_ring->buf_mask;
+	end = e->end_ptr_in_hw_ring & mux->real_ring->buf_mask;
+	if (start > end) {
+		if (readp <= end)
+			readp += mux->real_ring->ring_size >> 2;
+		end += mux->real_ring->ring_size >> 2;
+	}
+
+	if (start <= readp && readp <= end) {
+		offset = readp - start;
+		e->sw_rptr = (e->sw_cptr + offset) & ring->buf_mask;
+	} else if (readp < start) {
+		e->sw_rptr = e->sw_cptr;
+	} else {
+		/* end < readptr */
+		e->sw_rptr = e->sw_wptr;
+	}
+
+	return e->sw_rptr;
+}
+
+u64 amdgpu_sw_ring_get_rptr_gfx(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ring_mux *mux = &adev->gfx.muxer;
+
+	WARN_ON(!ring->is_sw_ring);
+	return amdgpu_ring_mux_get_rptr(mux, ring);
+}
+
+u64 amdgpu_sw_ring_get_wptr_gfx(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ring_mux *mux = &adev->gfx.muxer;
+
+	WARN_ON(!ring->is_sw_ring);
+	return amdgpu_ring_mux_get_wptr(mux, ring);
+}
+
+void amdgpu_sw_ring_set_wptr_gfx(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ring_mux *mux = &adev->gfx.muxer;
+
+	WARN_ON(!ring->is_sw_ring);
+	amdgpu_ring_mux_set_wptr(mux, ring, ring->wptr);
+}
+
+/* Override insert_nop to prevent emitting nops to the software rings */
+void amdgpu_sw_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
+{
+	WARN_ON(!ring->is_sw_ring);
+}
+
+const char *amdgpu_sw_ring_name(int idx)
+{
+	return idx < ARRAY_SIZE(sw_ring_info) ?
+		sw_ring_info[idx].ring_name : NULL;
+}
+
+unsigned int amdgpu_sw_ring_priority(int idx)
+{
+	return idx < ARRAY_SIZE(sw_ring_info) ?
+		sw_ring_info[idx].hw_pio : AMDGPU_RING_PRIO_DEFAULT;
+}
+
+/*Scan on low prio rings to have unsignaled fence and high ring has no fence.*/
+static int amdgpu_mcbp_scan(struct amdgpu_ring_mux *mux)
+{
+	struct amdgpu_ring *ring;
+	int i, need_preempt;
+
+	need_preempt = 0;
+	for (i = 0; i < mux->num_ring_entries; i++) {
+		ring = mux->ring_entry[i].ring;
+		if (ring->hw_prio > AMDGPU_RING_PRIO_DEFAULT &&
+		    amdgpu_fence_count_emitted(ring) > 0)
+			return 0;
+		if (ring->hw_prio <= AMDGPU_RING_PRIO_DEFAULT &&
+		    amdgpu_fence_last_unsignaled_time_us(ring) >
+		    AMDGPU_MAX_LAST_UNSIGNALED_THRESHOLD_US)
+			need_preempt = 1;
+	}
+	return need_preempt && !mux->s_resubmit;
+}
+
+/* Trigger Mid-Command Buffer Preemption (MCBP) and find if we need to resubmit. */
+static int amdgpu_mcbp_trigger_preempt(struct amdgpu_ring_mux *mux)
+{
+	int r;
+
+	spin_lock(&mux->lock);
+	mux->pending_trailing_fence_signaled = true;
+	r = amdgpu_ring_preempt_ib(mux->real_ring);
+	spin_unlock(&mux->lock);
+	return r;
+}
+
+void amdgpu_sw_ring_ib_begin(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ring_mux *mux = &adev->gfx.muxer;
+
+	WARN_ON(!ring->is_sw_ring);
+	if (ring->hw_prio > AMDGPU_RING_PRIO_DEFAULT) {
+		if (amdgpu_mcbp_scan(mux) > 0)
+			amdgpu_mcbp_trigger_preempt(mux);
+		return;
+	}
+
+	amdgpu_ring_mux_start_ib(mux, ring);
+}
+
+void amdgpu_sw_ring_ib_end(struct amdgpu_ring *ring)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_ring_mux *mux = &adev->gfx.muxer;
+
+	WARN_ON(!ring->is_sw_ring);
+	if (ring->hw_prio > AMDGPU_RING_PRIO_DEFAULT)
+		return;
+	amdgpu_ring_mux_end_ib(mux, ring);
+}
+
+void amdgpu_ring_mux_start_ib(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring)
+{
+	struct amdgpu_mux_entry *e;
+	struct amdgpu_mux_chunk *chunk;
+
+	spin_lock(&mux->lock);
+	amdgpu_mux_resubmit_chunks(mux);
+	spin_unlock(&mux->lock);
+
+	e = amdgpu_ring_mux_sw_entry(mux, ring);
+	if (!e) {
+		DRM_ERROR("cannot find entry!\n");
+		return;
+	}
+
+	chunk = kmem_cache_alloc(amdgpu_mux_chunk_slab, GFP_KERNEL);
+	if (!chunk) {
+		DRM_ERROR("alloc amdgpu_mux_chunk_slab failed\n");
+		return;
+	}
+
+	chunk->start = ring->wptr;
+	list_add_tail(&chunk->entry, &e->list);
+}
+
+static void scan_and_remove_signaled_chunk(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring)
+{
+	uint32_t last_seq = 0;
+	struct amdgpu_mux_entry *e;
+	struct amdgpu_mux_chunk *chunk, *tmp;
+
+	e = amdgpu_ring_mux_sw_entry(mux, ring);
+	if (!e) {
+		DRM_ERROR("cannot find entry!\n");
+		return;
+	}
+
+	last_seq = atomic_read(&ring->fence_drv.last_seq);
+
+	list_for_each_entry_safe(chunk, tmp, &e->list, entry) {
+		if (chunk->sync_seq <= last_seq) {
+			list_del(&chunk->entry);
+			kmem_cache_free(amdgpu_mux_chunk_slab, chunk);
+		}
+	}
+}
+
+void amdgpu_ring_mux_end_ib(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring)
+{
+	struct amdgpu_mux_entry *e;
+	struct amdgpu_mux_chunk *chunk;
+
+	e = amdgpu_ring_mux_sw_entry(mux, ring);
+	if (!e) {
+		DRM_ERROR("cannot find entry!\n");
+		return;
+	}
+
+	chunk = list_last_entry(&e->list, struct amdgpu_mux_chunk, entry);
+	if (!chunk) {
+		DRM_ERROR("cannot find chunk!\n");
+		return;
+	}
+
+	chunk->end = ring->wptr;
+	chunk->sync_seq = READ_ONCE(ring->fence_drv.sync_seq);
+
+	scan_and_remove_signaled_chunk(mux, ring);
+}
+
+bool amdgpu_mcbp_handle_trailing_fence_irq(struct amdgpu_ring_mux *mux)
+{
+	struct amdgpu_mux_entry *e;
+	struct amdgpu_ring *ring = NULL;
+	int i;
+
+	if (!mux->pending_trailing_fence_signaled)
+		return false;
+
+	if (mux->real_ring->trail_seq != le32_to_cpu(*mux->real_ring->trail_fence_cpu_addr))
+		return false;
+
+	for (i = 0; i < mux->num_ring_entries; i++) {
+		e = &mux->ring_entry[i];
+		if (e->ring->hw_prio <= AMDGPU_RING_PRIO_DEFAULT) {
+			ring = e->ring;
+			break;
+		}
+	}
+
+	if (!ring) {
+		DRM_ERROR("cannot find low priority ring\n");
+		return false;
+	}
+
+	amdgpu_fence_process(ring);
+	if (amdgpu_fence_count_emitted(ring) > 0) {
+		mux->s_resubmit = true;
+		mux->seqno_to_resubmit = ring->fence_drv.sync_seq;
+		amdgpu_ring_mux_schedule_resubmit(mux);
+	}
+
+	mux->pending_trailing_fence_signaled = false;
+	return true;
+}