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* [PATCH 1/4] drm/amdgpu: Introduce gfx software ring (v9)
@ 2022-11-29  7:10 jiadong.zhu
  2022-11-29  7:10 ` [PATCH 2/4] drm/amdgpu: Add software ring callbacks for gfx9 (v8) jiadong.zhu
                   ` (4 more replies)
  0 siblings, 5 replies; 10+ messages in thread
From: jiadong.zhu @ 2022-11-29  7:10 UTC (permalink / raw)
  To: amd-gfx
  Cc: Andrey Grodzovsky, Michel Dänzer, Huang Rui, Luben Tuikov,
	Jiadong.Zhu, Christian Koenig

From: "Jiadong.Zhu" <Jiadong.Zhu@amd.com>

The software ring is created to support priority context while there is only
one hardware queue for gfx.

Every software ring has its fence driver and could be used as an ordinary ring
for the GPU scheduler.
Multiple software rings are bound to a real ring with the ring muxer. The
packages committed on the software ring are copied to the real ring.

v2: Use array to store software ring entry.
v3: Remove unnecessary prints.
v4: Remove amdgpu_ring_sw_init/fini functions,
using gtt for sw ring buffer for later dma copy
optimization.
v5: Allocate ring entry dynamically in the muxer.
v6: Update comments for the ring muxer.
v7: Modify for function naming.
v8: Combine software ring functions into amdgpu_ring_mux.c
v9: Use kernel-doc comment on the get_rptr function.

Cc: Christian Koenig <Christian.Koenig@amd.com>
Cc: Luben Tuikov <Luben.Tuikov@amd.com>
Cc: Andrey Grodzovsky  <Andrey.Grodzovsky@amd.com>
Cc: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Jiadong.Zhu <Jiadong.Zhu@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Acked-by: Luben Tuikov <luben.tuikov@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Makefile          |   3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h      |   3 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h     |   4 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c | 221 +++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h |  76 +++++++
 5 files changed, 306 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 74f109a56d90..f58aa5d2e83e 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -62,7 +62,8 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
 	amdgpu_vm_sdma.o amdgpu_discovery.o amdgpu_ras_eeprom.o amdgpu_nbio.o \
 	amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o \
 	amdgpu_fw_attestation.o amdgpu_securedisplay.o \
-	amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o
+	amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o \
+	amdgpu_ring_mux.o
 
 amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
index 1e6e35ff3f13..7c2692f29311 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
@@ -33,6 +33,7 @@
 #include "amdgpu_imu.h"
 #include "soc15.h"
 #include "amdgpu_ras.h"
+#include "amdgpu_ring_mux.h"
 
 /* GFX current status */
 #define AMDGPU_GFX_NORMAL_MODE			0x00000000L
@@ -363,6 +364,8 @@ struct amdgpu_gfx {
 	struct amdgpu_gfx_ras		*ras;
 
 	bool				is_poweron;
+
+	struct amdgpu_ring_mux          muxer;
 };
 
 #define amdgpu_gfx_get_gpu_clock_counter(adev) (adev)->gfx.funcs->get_gpu_clock_counter((adev))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 82c178a9033a..8be51ebfedd5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -279,6 +279,10 @@ struct amdgpu_ring {
 	bool			is_mes_queue;
 	uint32_t		hw_queue_id;
 	struct amdgpu_mes_ctx_data *mes_ctx;
+
+	bool            is_sw_ring;
+	unsigned int    entry_index;
+
 };
 
 #define amdgpu_ring_parse_cs(r, p, job, ib) ((r)->funcs->parse_cs((p), (job), (ib)))
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..6fbf71451e29
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
@@ -0,0 +1,221 @@
+/*
+ * 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)
+
+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;
+	spin_lock_init(&mux->lock);
+
+	return 0;
+}
+
+void amdgpu_ring_mux_fini(struct amdgpu_ring_mux *mux)
+{
+	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;
+
+	mux->num_ring_entries += 1;
+	return 0;
+}
+
+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);
+	}
+}
+
+void amdgpu_ring_mux_set_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring, u64 wptr)
+{
+	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;
+	}
+
+	spin_lock(&mux->lock);
+	e->sw_cptr = e->sw_wptr;
+	e->sw_wptr = wptr;
+	e->start_ptr_in_hw_ring = mux->real_ring->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);
+
+	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);
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
new file mode 100644
index 000000000000..f58672a8e0ad
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
@@ -0,0 +1,76 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __AMDGPU_RING_MUX__
+#define __AMDGPU_RING_MUX__
+
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include "amdgpu_ring.h"
+
+struct amdgpu_ring;
+/**
+ * struct amdgpu_mux_entry - the entry recording software rings copying information.
+ * @ring: the pointer to the software ring.
+ * @start_ptr_in_hw_ring: last start location copied to in the hardware ring.
+ * @end_ptr_in_hw_ring: last end location copied to in the hardware ring.
+ * @sw_cptr: the position of the copy pointer in the sw ring.
+ * @sw_rptr: the read pointer in software ring.
+ * @sw_wptr: the write pointer in software ring.
+ */
+struct amdgpu_mux_entry {
+	struct amdgpu_ring      *ring;
+	u64                     start_ptr_in_hw_ring;
+	u64                     end_ptr_in_hw_ring;
+	u64                     sw_cptr;
+	u64                     sw_rptr;
+	u64                     sw_wptr;
+};
+
+struct amdgpu_ring_mux {
+	struct amdgpu_ring      *real_ring;
+
+	struct amdgpu_mux_entry *ring_entry;
+	unsigned int            num_ring_entries;
+	unsigned int            ring_entry_size;
+	/*the lock for copy data from different software rings*/
+	spinlock_t              lock;
+};
+
+int amdgpu_ring_mux_init(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring,
+			 unsigned int entry_size);
+void amdgpu_ring_mux_fini(struct amdgpu_ring_mux *mux);
+int amdgpu_ring_mux_add_sw_ring(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+void amdgpu_ring_mux_set_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring, u64 wptr);
+u64 amdgpu_ring_mux_get_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+u64 amdgpu_ring_mux_get_rptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+
+u64 amdgpu_sw_ring_get_rptr_gfx(struct amdgpu_ring *ring);
+u64 amdgpu_sw_ring_get_wptr_gfx(struct amdgpu_ring *ring);
+void amdgpu_sw_ring_set_wptr_gfx(struct amdgpu_ring *ring);
+
+void amdgpu_sw_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count);
+void amdgpu_sw_ring_ib_begin(struct amdgpu_ring *ring);
+void amdgpu_sw_ring_ib_end(struct amdgpu_ring *ring);
+
+#endif
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread
* [PATCH 4/4] drm/amdgpu: MCBP based on DRM scheduler (v9)
@ 2022-12-01 10:32 jiadong.zhu
  0 siblings, 0 replies; 10+ messages in thread
From: jiadong.zhu @ 2022-12-01 10:32 UTC (permalink / raw)
  To: amd-gfx
  Cc: Andrey Grodzovsky, Michel Dänzer, Huang Rui, Luben Tuikov,
	Jiadong.Zhu, Christian König

From: "Jiadong.Zhu" <Jiadong.Zhu@amd.com>

Trigger Mid-Command Buffer Preemption according to the priority of the software
rings and the hw fence signalling condition.

The muxer saves the locations of the indirect buffer frames from the software
ring together with the fence sequence number in its fifo queue, and pops out
those records when the fences are signalled. The locations are used to resubmit
packages in preemption scenarios by coping the chunks from the software ring.

v2: Update comment style.
v3: Fix conflict caused by previous modifications.
v4: Remove unnecessary prints.
v5: Fix corner cases for resubmission cases.
v6: Refactor functions for resubmission, calling fence_process in irq handler.
v7: Solve conflict for removing amdgpu_sw_ring.c.
v8: Add time threshold to judge if preemption request is needed.
v9: Correct comment spelling. Set fence emit timestamp before rsu assignment.

Cc: Christian Koenig <Christian.Koenig@amd.com>
Cc: Luben Tuikov <Luben.Tuikov@amd.com>
Cc: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Cc: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Jiadong.Zhu <Jiadong.Zhu@amd.com>
Acked-by: Luben Tuikov <luben.tuikov@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c    |  54 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c       |   2 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c     |  12 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h     |   8 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c | 351 +++++++++++++++++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h |  29 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c       |   2 +
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c        |   7 +-
 8 files changed, 422 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index d0d99ed607dd..00444203220d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -55,6 +55,7 @@ struct amdgpu_fence {
 
 	/* RB, DMA, etc. */
 	struct amdgpu_ring		*ring;
+	ktime_t				start_timestamp;
 };
 
 static struct kmem_cache *amdgpu_fence_slab;
@@ -199,6 +200,8 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amd
 		}
 	}
 
+	to_amdgpu_fence(fence)->start_timestamp = ktime_get();
+
 	/* This function can't be called concurrently anyway, otherwise
 	 * emitting the fence would mess up the hardware ring buffer.
 	 */
@@ -406,6 +409,57 @@ unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring)
 	return lower_32_bits(emitted);
 }
 
+/**
+ * amdgpu_fence_last_unsignaled_time_us - the time fence emitted until now
+ * @ring: ring the fence is associated with
+ *
+ * Find the earliest fence unsignaled until now, calculate the time delta
+ * between the time fence emitted and now.
+ */
+u64 amdgpu_fence_last_unsignaled_time_us(struct amdgpu_ring *ring)
+{
+	struct amdgpu_fence_driver *drv = &ring->fence_drv;
+	struct dma_fence *fence;
+	uint32_t last_seq, sync_seq;
+
+	last_seq = atomic_read(&ring->fence_drv.last_seq);
+	sync_seq = READ_ONCE(ring->fence_drv.sync_seq);
+	if (last_seq == sync_seq)
+		return 0;
+
+	++last_seq;
+	last_seq &= drv->num_fences_mask;
+	fence = drv->fences[last_seq];
+	if (!fence)
+		return 0;
+
+	return ktime_us_delta(ktime_get(),
+		to_amdgpu_fence(fence)->start_timestamp);
+}
+
+/**
+ * amdgpu_fence_update_start_timestamp - update the timestamp of the fence
+ * @ring: ring the fence is associated with
+ * @seq: the fence seq number to update.
+ * @timestamp: the start timestamp to update.
+ *
+ * The function called at the time the fence and related ib is about to
+ * resubmit to gpu in MCBP scenario. Thus we do not consider race condition
+ * with amdgpu_fence_process to modify the same fence.
+ */
+void amdgpu_fence_update_start_timestamp(struct amdgpu_ring *ring, uint32_t seq, ktime_t timestamp)
+{
+	struct amdgpu_fence_driver *drv = &ring->fence_drv;
+	struct dma_fence *fence;
+
+	seq &= drv->num_fences_mask;
+	fence = drv->fences[seq];
+	if (!fence)
+		return;
+
+	to_amdgpu_fence(fence)->start_timestamp = timestamp;
+}
+
 /**
  * amdgpu_fence_driver_start_ring - make the fence driver
  * ready for use on the requested ring.
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
index 258cffe3c06a..af86d87e2f3b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -211,6 +211,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 		}
 	}
 
+	amdgpu_ring_ib_begin(ring);
 	if (job && ring->funcs->init_cond_exec)
 		patch_offset = amdgpu_ring_init_cond_exec(ring);
 
@@ -285,6 +286,7 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
 	    ring->hw_prio == AMDGPU_GFX_PIPE_PRIO_HIGH)
 		ring->funcs->emit_wave_limit(ring, false);
 
+	amdgpu_ring_ib_end(ring);
 	amdgpu_ring_commit(ring);
 	return 0;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index d3558c34d406..dc474b809604 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -569,3 +569,15 @@ int amdgpu_ring_init_mqd(struct amdgpu_ring *ring)
 
 	return mqd_mgr->init_mqd(adev, ring->mqd_ptr, &prop);
 }
+
+void amdgpu_ring_ib_begin(struct amdgpu_ring *ring)
+{
+	if (ring->is_sw_ring)
+		amdgpu_sw_ring_ib_begin(ring);
+}
+
+void amdgpu_ring_ib_end(struct amdgpu_ring *ring)
+{
+	if (ring->is_sw_ring)
+		amdgpu_sw_ring_ib_end(ring);
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 073e767c057f..f752c7ae7f60 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -145,8 +145,13 @@ signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
 				      uint32_t wait_seq,
 				      signed long timeout);
 unsigned amdgpu_fence_count_emitted(struct amdgpu_ring *ring);
+
 void amdgpu_fence_driver_isr_toggle(struct amdgpu_device *adev, bool stop);
 
+u64 amdgpu_fence_last_unsignaled_time_us(struct amdgpu_ring *ring);
+void amdgpu_fence_update_start_timestamp(struct amdgpu_ring *ring, uint32_t seq,
+					 ktime_t timestamp);
+
 /*
  * Rings.
  */
@@ -313,6 +318,9 @@ struct amdgpu_ring {
 #define amdgpu_ring_preempt_ib(r) (r)->funcs->preempt_ib(r)
 
 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw);
+void amdgpu_ring_ib_begin(struct amdgpu_ring *ring);
+void amdgpu_ring_ib_end(struct amdgpu_ring *ring);
+
 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count);
 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib);
 void amdgpu_ring_commit(struct amdgpu_ring *ring);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
index a52c4e7e8c39..3348337379da 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
@@ -28,6 +28,7 @@
 #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;
@@ -37,23 +38,145 @@ static const struct ring_info {
 	{ 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;
@@ -73,62 +196,48 @@ int amdgpu_ring_mux_add_sw_ring(struct amdgpu_ring_mux *mux, struct amdgpu_ring
 	ring->entry_index = mux->num_ring_entries;
 	e->ring = ring;
 
+	INIT_LIST_HEAD(&e->list);
 	mux->num_ring_entries += 1;
 	return 0;
 }
 
-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);
-	}
-}
-
 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;
 	}
 
-	spin_lock(&mux->lock);
 	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;
 
-	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);
-
+	/* 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);
 }
 
@@ -239,3 +348,169 @@ 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.*/
+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. */
+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, size = 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);
+		} else {
+			size++;
+		}
+	}
+}
+
+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;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
index f67970dc3dbd..4be45fc14954 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
@@ -29,6 +29,7 @@
 #include "amdgpu_ring.h"
 
 struct amdgpu_ring;
+
 /**
  * struct amdgpu_mux_entry - the entry recording software rings copying information.
  * @ring: the pointer to the software ring.
@@ -37,6 +38,7 @@ struct amdgpu_ring;
  * @sw_cptr: the position of the copy pointer in the sw ring.
  * @sw_rptr: the read pointer in software ring.
  * @sw_wptr: the write pointer in software ring.
+ * @list: list head for amdgpu_mux_chunk
  */
 struct amdgpu_mux_entry {
 	struct amdgpu_ring      *ring;
@@ -45,6 +47,7 @@ struct amdgpu_mux_entry {
 	u64                     sw_cptr;
 	u64                     sw_rptr;
 	u64                     sw_wptr;
+	struct list_head        list;
 };
 
 struct amdgpu_ring_mux {
@@ -55,6 +58,26 @@ struct amdgpu_ring_mux {
 	unsigned int            ring_entry_size;
 	/*the lock for copy data from different software rings*/
 	spinlock_t              lock;
+	bool                    s_resubmit;
+	uint32_t                seqno_to_resubmit;
+	u64                     wptr_resubmit;
+	struct timer_list       resubmit_timer;
+
+	bool                    pending_trailing_fence_signaled;
+};
+
+/**
+ * struct amdgpu_mux_chunk - save the location of indirect buffer's package on softare rings.
+ * @entry: the list entry.
+ * @sync_seq: the fence seqno related with the saved IB.
+ * @start:- start location on the software ring.
+ * @end:- end location on the software ring.
+ */
+struct amdgpu_mux_chunk {
+	struct list_head        entry;
+	uint32_t                sync_seq;
+	u64                     start;
+	u64                     end;
 };
 
 int amdgpu_ring_mux_init(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring,
@@ -64,15 +87,17 @@ int amdgpu_ring_mux_add_sw_ring(struct amdgpu_ring_mux *mux, struct amdgpu_ring
 void amdgpu_ring_mux_set_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring, u64 wptr);
 u64 amdgpu_ring_mux_get_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
 u64 amdgpu_ring_mux_get_rptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+void amdgpu_ring_mux_start_ib(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+void amdgpu_ring_mux_end_ib(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+bool amdgpu_mcbp_handle_trailing_fence_irq(struct amdgpu_ring_mux *mux);
 
 u64 amdgpu_sw_ring_get_rptr_gfx(struct amdgpu_ring *ring);
 u64 amdgpu_sw_ring_get_wptr_gfx(struct amdgpu_ring *ring);
 void amdgpu_sw_ring_set_wptr_gfx(struct amdgpu_ring *ring);
-
 void amdgpu_sw_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count);
 void amdgpu_sw_ring_ib_begin(struct amdgpu_ring *ring);
 void amdgpu_sw_ring_ib_end(struct amdgpu_ring *ring);
-
 const char *amdgpu_sw_ring_name(int idx);
 unsigned int amdgpu_sw_ring_priority(int idx);
+
 #endif
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 003aa9e47085..37b461a19117 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -541,6 +541,7 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job,
 	if (!vm_flush_needed && !gds_switch_needed && !need_pipe_sync)
 		return 0;
 
+	amdgpu_ring_ib_begin(ring);
 	if (ring->funcs->init_cond_exec)
 		patch_offset = amdgpu_ring_init_cond_exec(ring);
 
@@ -601,6 +602,7 @@ int amdgpu_vm_flush(struct amdgpu_ring *ring, struct amdgpu_job *job,
 		amdgpu_ring_emit_switch_buffer(ring);
 		amdgpu_ring_emit_switch_buffer(ring);
 	}
+	amdgpu_ring_ib_end(ring);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index afcc6e397c72..f202b45c413c 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -5456,7 +5456,7 @@ static int gfx_v9_0_ring_preempt_ib(struct amdgpu_ring *ring)
 	ring->trail_seq += 1;
 	amdgpu_ring_alloc(ring, 13);
 	gfx_v9_0_ring_emit_fence(ring, ring->trail_fence_gpu_addr,
-				 ring->trail_seq, AMDGPU_FENCE_FLAG_EXEC);
+				 ring->trail_seq, AMDGPU_FENCE_FLAG_EXEC | AMDGPU_FENCE_FLAG_INT);
 	/*reset the CP_VMID_PREEMPT after trailing fence*/
 	amdgpu_ring_emit_wreg(ring,
 			      SOC15_REG_OFFSET(GC, 0, mmCP_VMID_PREEMPT),
@@ -5882,8 +5882,9 @@ static int gfx_v9_0_eop_irq(struct amdgpu_device *adev,
 
 	switch (me_id) {
 	case 0:
-		/* Fence signals are handled on the software rings*/
-		if (adev->gfx.num_gfx_rings) {
+		if (adev->gfx.num_gfx_rings &&
+		    !amdgpu_mcbp_handle_trailing_fence_irq(&adev->gfx.muxer)) {
+			/* Fence signals are handled on the software rings*/
 			for (i = 0; i < GFX9_NUM_SW_GFX_RINGS; i++)
 				amdgpu_fence_process(&adev->gfx.sw_gfx_ring[i]);
 		}
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread
* [PATCH 1/4] drm/amdgpu: Introduce gfx software ring (v8)
@ 2022-11-17  3:04 jiadong.zhu
  2022-11-17  3:04 ` [PATCH 4/4] drm/amdgpu: MCBP based on DRM scheduler (v9) jiadong.zhu
  0 siblings, 1 reply; 10+ messages in thread
From: jiadong.zhu @ 2022-11-17  3:04 UTC (permalink / raw)
  To: amd-gfx
  Cc: Andrey Grodzovsky, Michel Dänzer, Huang Rui, Luben Tuikov,
	Jiadong.Zhu, Christian Koenig

From: "Jiadong.Zhu" <Jiadong.Zhu@amd.com>

The software ring is created to support priority context while there is only
one hardware queue for gfx.

Every software ring has its fence driver and could be used as an ordinary ring
for the GPU scheduler.
Multiple software rings are bound to a real ring with the ring muxer. The
packages committed on the software ring are copied to the real ring.

v2: Use array to store software ring entry.
v3: Remove unnecessary prints.
v4: Remove amdgpu_ring_sw_init/fini functions,
using gtt for sw ring buffer for later dma copy
optimization.
v5: Allocate ring entry dynamically in the muxer.
v6: Update comments for the ring muxer.
v7: Modify for function naming.
v8: Combine software ring functions into amdgpu_ring_mux.c

Cc: Christian Koenig <Christian.Koenig@amd.com>
Cc: Luben Tuikov <Luben.Tuikov@amd.com>
Cc: Andrey Grodzovsky  <Andrey.Grodzovsky@amd.com>
Cc: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Jiadong.Zhu <Jiadong.Zhu@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Makefile          |   3 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h      |   3 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h     |   4 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c | 217 +++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h |  76 +++++++
 5 files changed, 302 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 74f109a56d90..f58aa5d2e83e 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -62,7 +62,8 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
 	amdgpu_vm_sdma.o amdgpu_discovery.o amdgpu_ras_eeprom.o amdgpu_nbio.o \
 	amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o amdgpu_rap.o \
 	amdgpu_fw_attestation.o amdgpu_securedisplay.o \
-	amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o
+	amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o \
+	amdgpu_ring_mux.o
 
 amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
index 1e6e35ff3f13..7c2692f29311 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
@@ -33,6 +33,7 @@
 #include "amdgpu_imu.h"
 #include "soc15.h"
 #include "amdgpu_ras.h"
+#include "amdgpu_ring_mux.h"
 
 /* GFX current status */
 #define AMDGPU_GFX_NORMAL_MODE			0x00000000L
@@ -363,6 +364,8 @@ struct amdgpu_gfx {
 	struct amdgpu_gfx_ras		*ras;
 
 	bool				is_poweron;
+
+	struct amdgpu_ring_mux          muxer;
 };
 
 #define amdgpu_gfx_get_gpu_clock_counter(adev) (adev)->gfx.funcs->get_gpu_clock_counter((adev))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 82c178a9033a..8be51ebfedd5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -279,6 +279,10 @@ struct amdgpu_ring {
 	bool			is_mes_queue;
 	uint32_t		hw_queue_id;
 	struct amdgpu_mes_ctx_data *mes_ctx;
+
+	bool            is_sw_ring;
+	unsigned int    entry_index;
+
 };
 
 #define amdgpu_ring_parse_cs(r, p, job, ib) ((r)->funcs->parse_cs((p), (job), (ib)))
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..43cab8a37754
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
@@ -0,0 +1,217 @@
+/*
+ * 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)
+
+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;
+	spin_lock_init(&mux->lock);
+
+	return 0;
+}
+
+void amdgpu_ring_mux_fini(struct amdgpu_ring_mux *mux)
+{
+	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;
+
+	mux->num_ring_entries += 1;
+	return 0;
+}
+
+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);
+	}
+}
+
+void amdgpu_ring_mux_set_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring, u64 wptr)
+{
+	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;
+	}
+
+	spin_lock(&mux->lock);
+	e->sw_cptr = e->sw_wptr;
+	e->sw_wptr = wptr;
+	e->start_ptr_in_hw_ring = mux->real_ring->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);
+
+	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;
+}
+
+/*
+ * 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);
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
new file mode 100644
index 000000000000..d91629589577
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.h
@@ -0,0 +1,76 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __AMDGPU_RING_MUX__
+#define __AMDGPU_RING_MUX__
+
+#include <linux/timer.h>
+#include <linux/spinlock.h>
+#include "amdgpu_ring.h"
+
+struct amdgpu_ring;
+/**
+ * struct amdgpu_mux_entry - the entry recording software rings copying information.
+ * @ring: the pointer to the software ring.
+ * @start_ptr_in_hw_ring: last start location copied to in the hardware ring.
+ * @end_ptr_in_hw_ring: last end location copied to in the hardware ring.
+ * @sw_cptr: the position of the copy pointer in the sw ring.
+ * @sw_rptr: the read pointer in software ring.
+ * @sw_wptr: the write pointer in software ring.
+ */
+struct amdgpu_mux_entry {
+	struct                  amdgpu_ring *ring;
+	u64                     start_ptr_in_hw_ring;
+	u64                     end_ptr_in_hw_ring;
+	u64                     sw_cptr;
+	u64                     sw_rptr;
+	u64                     sw_wptr;
+};
+
+struct amdgpu_ring_mux {
+	struct amdgpu_ring      *real_ring;
+
+	struct amdgpu_mux_entry *ring_entry;
+	unsigned int            num_ring_entries;
+	unsigned int            ring_entry_size;
+	/*the lock for copy data from different software rings*/
+	spinlock_t              lock;
+};
+
+int amdgpu_ring_mux_init(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring,
+			 unsigned int entry_size);
+void amdgpu_ring_mux_fini(struct amdgpu_ring_mux *mux);
+int amdgpu_ring_mux_add_sw_ring(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+void amdgpu_ring_mux_set_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring, u64 wptr);
+u64 amdgpu_ring_mux_get_wptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+u64 amdgpu_ring_mux_get_rptr(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring);
+
+u64 amdgpu_sw_ring_get_rptr_gfx(struct amdgpu_ring *ring);
+u64 amdgpu_sw_ring_get_wptr_gfx(struct amdgpu_ring *ring);
+void amdgpu_sw_ring_set_wptr_gfx(struct amdgpu_ring *ring);
+
+void amdgpu_sw_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count);
+void amdgpu_sw_ring_ib_begin(struct amdgpu_ring *ring);
+void amdgpu_sw_ring_ib_end(struct amdgpu_ring *ring);
+
+#endif
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2022-12-10 13:47 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-11-29  7:10 [PATCH 1/4] drm/amdgpu: Introduce gfx software ring (v9) jiadong.zhu
2022-11-29  7:10 ` [PATCH 2/4] drm/amdgpu: Add software ring callbacks for gfx9 (v8) jiadong.zhu
2022-11-29  7:10 ` [PATCH 3/4] drm/amdgpu: Modify unmap_queue format for gfx9 (v6) jiadong.zhu
2022-12-01  8:25   ` Luben Tuikov
2022-11-29  7:10 ` [PATCH 4/4] drm/amdgpu: MCBP based on DRM scheduler (v9) jiadong.zhu
2022-12-01  8:34   ` Luben Tuikov
2022-11-29 11:46 ` [PATCH 1/4] drm/amdgpu: Introduce gfx software ring (v9) Christian König
2022-12-10 13:47 ` Michel Dänzer
  -- strict thread matches above, loose matches on Subject: below --
2022-12-01 10:32 [PATCH 4/4] drm/amdgpu: MCBP based on DRM scheduler (v9) jiadong.zhu
2022-11-17  3:04 [PATCH 1/4] drm/amdgpu: Introduce gfx software ring (v8) jiadong.zhu
2022-11-17  3:04 ` [PATCH 4/4] drm/amdgpu: MCBP based on DRM scheduler (v9) jiadong.zhu

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