[PATCH 39/73] drm/amdgpu/mes: manage mes doorbell allocation

[Alex Deucher]

From: Jack Xiao <Jack.Xiao at amd.com>

It is used to manage the doorbell allocation of mes processes and queues.
Driver calls into process doorbell allocation to get the slice doorbell
for the process, then the doorbell for a queue is allocated from the
process doorbell slice.

Signed-off-by: Jack Xiao <Jack.Xiao at amd.com>
Acked-by: Christian König <christian.koenig at amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Makefile     |   1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c | 133 ++++++++++++++++++++++++
 2 files changed, 134 insertions(+)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 7a1b13fabebb..803e7f5dc458 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -144,6 +144,7 @@ amdgpu-y += \
 
 # add MES block
 amdgpu-y += \
+	amdgpu_mes.o \
 	mes_v10_1.o
 
 # add UVD block
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
new file mode 100644
index 000000000000..1c591cb45fd9
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mes.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2019 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 "amdgpu_mes.h"
+#include "amdgpu.h"
+#include "soc15_common.h"
+#include "amdgpu_mes_ctx.h"
+
+#define AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS 1024
+#define AMDGPU_ONE_DOORBELL_SIZE 8
+
+static int amdgpu_mes_doorbell_process_slice(struct amdgpu_device *adev)
+{
+	return roundup(AMDGPU_ONE_DOORBELL_SIZE *
+		       AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS,
+		       PAGE_SIZE);
+}
+
+static int amdgpu_mes_alloc_process_doorbells(struct amdgpu_device *adev,
+				      struct amdgpu_mes_process *process)
+{
+	int r = ida_simple_get(&adev->mes.doorbell_ida, 2,
+			       adev->mes.max_doorbell_slices,
+			       GFP_KERNEL);
+	if (r > 0)
+		process->doorbell_index = r;
+
+	return r;
+}
+
+static void amdgpu_mes_free_process_doorbells(struct amdgpu_device *adev,
+				      struct amdgpu_mes_process *process)
+{
+	if (process->doorbell_index)
+		ida_simple_remove(&adev->mes.doorbell_ida,
+				  process->doorbell_index);
+}
+
+static int amdgpu_mes_queue_doorbell_get(struct amdgpu_device *adev,
+					 struct amdgpu_mes_process *process,
+					 int ip_type, uint64_t *doorbell_index)
+{
+	unsigned int offset, found;
+
+	if (ip_type == AMDGPU_RING_TYPE_SDMA) {
+		offset = adev->doorbell_index.sdma_engine[0];
+		found = find_next_zero_bit(process->doorbell_bitmap,
+					   AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS,
+					   offset);
+	} else {
+		found = find_first_zero_bit(process->doorbell_bitmap,
+					    AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS);
+	}
+
+	if (found >= AMDGPU_MES_MAX_NUM_OF_QUEUES_PER_PROCESS) {
+		DRM_WARN("No doorbell available\n");
+		return -ENOSPC;
+	}
+
+	set_bit(found, process->doorbell_bitmap);
+
+	*doorbell_index =
+		(process->doorbell_index *
+		 amdgpu_mes_doorbell_process_slice(adev)) / sizeof(u32) +
+		found * 2;
+
+	return 0;
+}
+
+static void amdgpu_mes_queue_doorbell_free(struct amdgpu_device *adev,
+					   struct amdgpu_mes_process *process,
+					   uint32_t doorbell_index)
+{
+	unsigned int old, doorbell_id;
+
+	doorbell_id = doorbell_index -
+		(process->doorbell_index *
+		 amdgpu_mes_doorbell_process_slice(adev)) / sizeof(u32);
+	doorbell_id /= 2;
+
+	old = test_and_clear_bit(doorbell_id, process->doorbell_bitmap);
+	WARN_ON(!old);
+}
+
+static int amdgpu_mes_doorbell_init(struct amdgpu_device *adev)
+{
+	size_t doorbell_start_offset;
+	size_t doorbell_aperture_size;
+	size_t doorbell_process_limit;
+
+	doorbell_start_offset = (adev->doorbell_index.max_assignment+1) * sizeof(u32);
+	doorbell_start_offset =
+		roundup(doorbell_start_offset,
+			amdgpu_mes_doorbell_process_slice(adev));
+
+	doorbell_aperture_size = adev->doorbell.size;
+	doorbell_aperture_size =
+			rounddown(doorbell_aperture_size,
+				  amdgpu_mes_doorbell_process_slice(adev));
+
+	if (doorbell_aperture_size > doorbell_start_offset)
+		doorbell_process_limit =
+			(doorbell_aperture_size - doorbell_start_offset) /
+			amdgpu_mes_doorbell_process_slice(adev);
+	else
+		return -ENOSPC;
+
+	adev->mes.doorbell_id_offset = doorbell_start_offset / sizeof(u32);
+	adev->mes.max_doorbell_slices = doorbell_process_limit;
+
+	DRM_INFO("max_doorbell_slices=%ld\n", doorbell_process_limit);
+	return 0;
+}
-- 
2.35.1