nvdla: add NVDLA driver

Additional update from Prashant Gaikwad <pgaikwad@nvidia.com>
Adapted for Linux 5.13 and the BeagleV Starlight board by
<cybergaszcz@gmail.com>

kernel test robot: fix platform_no_drv_owner.cocci warnings
Geert: Use div_u64() in dla_get_time_us()

Signed-off-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20220119060057.GA1143@7f39e361da8f
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2203090905560.780932@ramsan.of.borg
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>

Author: farzad64

drivers/Kconfig

@@ -245,4 +245,6 @@ source "drivers/hte/Kconfig"
 
 source "drivers/cdx/Kconfig"
 
+source "drivers/nvdla/Kconfig"
+
 endmenu

drivers/Makefile

@@ -196,3 +196,4 @@ obj-$(CONFIG_PECI)		+= peci/
 obj-$(CONFIG_HTE)		+= hte/
 obj-$(CONFIG_DRM_ACCEL)		+= accel/
 obj-$(CONFIG_CDX_BUS)		+= cdx/
+obj-$(CONFIG_NVDLA)		+= nvdla/

drivers/nvdla/Kconfig

@@ -0,0 +1,4 @@
+config NVDLA
+	tristate "The NVIDIA Deep Learning Accelerator"
+	depends on DRM
+	select DRM_GEM_DMA_HELPER

drivers/nvdla/Makefile

@@ -0,0 +1,21 @@
+
+ccflags-y += -I$(srctree)/$(src)
+ccflags-y += -I$(srctree)/$(src)/include
+
+nvdla-y := scheduler.o \
+	   engine.o \
+	   bdma.o \
+	   conv.o \
+	   sdp.o \
+	   cdp.o \
+	   pdp.o \
+	   rubik.o \
+	   cache.o \
+	   common.o \
+	   engine_data.o \
+	   engine_isr.o \
+	   engine_debug.o \
+	   nvdla_core_callbacks.o \
+	   nvdla_gem.o
+
+obj-$(CONFIG_NVDLA) += nvdla.o

drivers/nvdla/bdma.c

@@ -0,0 +1,280 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of NVIDIA CORPORATION nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <opendla.h>
+#include <dla_debug.h>
+#include <dla_err.h>
+#include <dla_interface.h>
+
+#include "dla_engine_internal.h"
+#include "engine_debug.h"
+
+static const uint8_t map_mem[] = {
+	FIELD_ENUM(BDMA_CFG_CMD_0, SRC_RAM_TYPE, MC),
+	FIELD_ENUM(BDMA_CFG_CMD_0, SRC_RAM_TYPE, CVSRAM),
+};
+
+#if STAT_ENABLE
+void
+dla_bdma_stat_data(struct dla_processor *processor,
+					struct dla_processor_group *group)
+{
+	uint64_t end_time = 0;
+	struct dla_bdma_stat_desc *bdma_stat;
+
+	bdma_stat = &processor->stat_data_desc->bdma_stat;
+
+	end_time = dla_get_time_us();
+
+	if (group->id == (uint32_t)0) {
+		bdma_stat->read_stall = bdma_reg_read(STATUS_GRP0_READ_STALL);
+		bdma_stat->write_stall = bdma_reg_read(STATUS_GRP0_WRITE_STALL);
+	} else {
+		bdma_stat->read_stall = bdma_reg_read(STATUS_GRP1_READ_STALL);
+		bdma_stat->write_stall = bdma_reg_read(STATUS_GRP1_WRITE_STALL);
+	}
+	bdma_stat->runtime = (uint32_t)(end_time - group->start_time);
+}
+
+void
+dla_bdma_dump_stat(struct dla_processor *processor)
+{
+	struct dla_bdma_stat_desc *bdma_stat;
+
+	bdma_stat = &processor->stat_data_desc->bdma_stat;
+
+	dla_debug_bdma_stats(bdma_stat);
+}
+#endif /* STAT_ENABLE */
+
+void
+dla_bdma_set_producer(int32_t group_id, int32_t rdma_group_id)
+{
+	/*
+	 * There is no producer bit for BDMA operation,
+	 * interrupt pointer decides which outstanding request
+	 * to use for this BDMA operation
+	 */
+}
+
+int
+dla_bdma_enable(struct dla_processor_group *group)
+{
+	struct dla_engine *engine = dla_get_engine();
+
+	dla_debug("Enter: %s\n", __func__);
+
+	if (group->surface_desc->bdma_surface.num_transfers == (uint16_t)0) {
+		group->events |= ((uint8_t)1 << DLA_EVENT_OP_COMPLETED);
+		goto exit;
+	}
+
+	if (engine->stat_enable == (uint32_t)1) {
+		bdma_reg_write(CFG_STATUS, FIELD_ENUM(BDMA_CFG_STATUS_0,
+							STALL_COUNT_EN, YES));
+		group->start_time = dla_get_time_us();
+	}
+
+	/*
+	 * Launch BDMA transfer
+	 */
+	if (group->id == 0)
+		bdma_reg_write(CFG_LAUNCH0, FIELD_ENUM(BDMA_CFG_LAUNCH0_0,
+							GRP0_LAUNCH, YES));
+	else
+		bdma_reg_write(CFG_LAUNCH1, FIELD_ENUM(BDMA_CFG_LAUNCH1_0,
+							GRP1_LAUNCH, YES));
+
+exit:
+	dla_debug("Exit: %s\n", __func__);
+	return 0;
+}
+
+void
+dla_bdma_rdma_check(struct dla_processor_group *group)
+{
+	group->is_rdma_needed = 0;
+}
+
+/*
+ * Program BDMA slot for transfer
+ */
+static int32_t
+processor_bdma_program_slot(struct dla_bdma_surface_desc *bdma_surface,
+				struct dla_bdma_transfer_desc *transfer)
+{
+	int32_t ret = 0;
+	uint64_t source_addr = 0;
+	uint64_t destination_addr = 0;
+	uint32_t high, low, reg;
+	uint8_t  bdma_free_slots = 0;
+	struct dla_engine *engine = dla_get_engine();
+
+	dla_debug("Enter: %s\n", __func__);
+
+	/* make sure there're enough free slots */
+	if (bdma_free_slots <= 0) {
+		do {
+			reg = bdma_reg_read(STATUS);
+			reg = (reg & MASK(BDMA_STATUS_0, FREE_SLOT)) >>
+					SHIFT(BDMA_STATUS_0, FREE_SLOT);
+		} while (reg == 0);
+		bdma_free_slots = (uint8_t)reg;
+	}
+
+	dla_get_dma_address(engine->driver_context, engine->task->task_data,
+						transfer->source_address,
+						(void *)&source_addr,
+						DESTINATION_DMA);
+	dla_get_dma_address(engine->driver_context, engine->task->task_data,
+						transfer->destination_address,
+						(void *)&destination_addr,
+						DESTINATION_DMA);
+
+	ASSERT_GOTO((transfer->line_repeat <= 8192),
+				ret, ERR(INVALID_INPUT), exit);
+	ASSERT_GOTO((transfer->surface_repeat <= 8192),
+				ret, ERR(INVALID_INPUT), exit);
+	ASSERT_GOTO((transfer->line_size % 32) == 0,
+				ret, ERR(INVALID_INPUT), exit);
+	ASSERT_GOTO(transfer->source_line >= transfer->line_size,
+				ret, ERR(INVALID_INPUT), exit);
+	ASSERT_GOTO(transfer->destination_line >= transfer->line_size,
+				ret, ERR(INVALID_INPUT), exit);
+	ASSERT_GOTO(transfer->source_surface >=
+			(transfer->source_line * transfer->line_repeat),
+				ret, ERR(INVALID_INPUT), exit);
+	ASSERT_GOTO(transfer->destination_surface >=
+			(transfer->destination_line * transfer->line_repeat),
+				ret, ERR(INVALID_INPUT), exit);
+
+	/* config registers */
+	high = HIGH32BITS(source_addr);
+	low = LOW32BITS(source_addr);
+	bdma_reg_write(CFG_SRC_ADDR_LOW, low);
+	bdma_reg_write(CFG_SRC_ADDR_HIGH, high);
+	high = HIGH32BITS(destination_addr);
+	low = LOW32BITS(destination_addr);
+	bdma_reg_write(CFG_DST_ADDR_LOW, low);
+	bdma_reg_write(CFG_DST_ADDR_HIGH, high);
+	bdma_reg_write(CFG_LINE, (transfer->line_size >> 5) - 1);
+	reg = (map_mem[bdma_surface->source_type] <<
+				SHIFT(BDMA_CFG_CMD_0, SRC_RAM_TYPE)) |
+		(map_mem[bdma_surface->destination_type] <<
+				SHIFT(BDMA_CFG_CMD_0, DST_RAM_TYPE));
+	bdma_reg_write(CFG_CMD, reg);
+	bdma_reg_write(CFG_LINE_REPEAT, transfer->line_repeat - 1);
+	bdma_reg_write(CFG_SRC_LINE, transfer->source_line);
+	bdma_reg_write(CFG_DST_LINE, transfer->destination_line);
+	bdma_reg_write(CFG_SURF_REPEAT, transfer->surface_repeat - 1);
+	bdma_reg_write(CFG_SRC_SURF, transfer->source_surface);
+	bdma_reg_write(CFG_DST_SURF, transfer->destination_surface);
+	bdma_reg_write(CFG_OP, FIELD_ENUM(BDMA_CFG_OP_0, EN, ENABLE));
+
+	dla_debug("Exit: %s\n", __func__);
+
+exit:
+	RETURN(ret);
+}
+
+int
+dla_bdma_is_ready(struct dla_processor *processor,
+			    struct dla_processor_group *group)
+{
+	struct dla_processor_group *next_group;
+
+	next_group = &processor->groups[!group->id];
+
+	/*
+	 * If another group is already programmed but not active then
+	 * do not program this operation as BDMA does not really
+	 * have shadow copies for groups. It will end programming
+	 * same group. Wait for another group to get enabled.
+	 */
+	if ((processor->group_status & (1 << next_group->id)) &&
+						!next_group->active)
+		return 0;
+
+	return 1;
+}
+
+void
+dla_bdma_dump_config(struct dla_processor_group *group)
+{
+	struct dla_bdma_op_desc *bdma_op;
+	struct dla_bdma_surface_desc *bdma_surface;
+
+	bdma_surface = &group->surface_desc->bdma_surface;
+	bdma_op = &group->operation_desc->bdma_op;
+
+	dla_debug_bdma_surface_desc(bdma_surface, group->roi_index);
+	dla_debug_bdma_op_desc(bdma_op, group->roi_index);
+}
+
+int
+dla_bdma_program(struct dla_processor_group *group)
+{
+	int32_t i;
+	int32_t ret = 0;
+	struct dla_bdma_surface_desc *bdma_surface;
+	struct dla_engine *engine = dla_get_engine();
+
+	dla_debug("Enter: %s\n", __func__);
+
+	if (!engine->config_data->bdma_enable) {
+		dla_error("BDMA is not supported for this configuration\n");
+		ret = ERR(INVALID_INPUT);
+		goto exit;
+	}
+
+	bdma_surface = &group->surface_desc->bdma_surface;
+
+	dla_debug("Num of transfers %u\n", bdma_surface->num_transfers);
+	if (bdma_surface->num_transfers == (uint16_t)0)
+		goto exit;
+
+	if (bdma_surface->num_transfers > NUM_MAX_BDMA_OPS) {
+		dla_error("Invalid number of transfers\n");
+		ret = ERR(INVALID_INPUT);
+		goto exit;
+	}
+
+	for (i = 0; i < bdma_surface->num_transfers; i++) {
+		ret = processor_bdma_program_slot(bdma_surface,
+					&bdma_surface->transfers[i]);
+		if (ret)
+			goto exit;
+	}
+
+	dla_enable_intr(MASK(GLB_S_INTR_MASK_0, BDMA_DONE_MASK1) |
+			MASK(GLB_S_INTR_MASK_0, BDMA_DONE_MASK0));
+
+exit:
+	dla_debug("Exit: %s\n", __func__);
+	RETURN(ret);
+}