Signed-off-by: Wendy Liang <wendy.liang@xxxxxxxxxx>
Signed-off-by: Hyun Kwon <hyun.kwon@xxxxxxxxxx>
---
MAINTAINERS | 8 +
drivers/misc/Kconfig | 12 +
drivers/misc/Makefile | 1 +
drivers/misc/xilinx-ai-engine/Makefile | 11 +
drivers/misc/xilinx-ai-engine/ai-engine-aie.c | 115 +++++
drivers/misc/xilinx-ai-engine/ai-engine-dev.c | 448 ++++++++++++++++++
drivers/misc/xilinx-ai-engine/ai-engine-internal.h | 226 ++++++++++
drivers/misc/xilinx-ai-engine/ai-engine-part.c | 498
+++++++++++++++++++++
drivers/misc/xilinx-ai-engine/ai-engine-res.c | 114 +++++
include/uapi/linux/xlnx-ai-engine.h | 107 +++++
10 files changed, 1540 insertions(+)
create mode 100644 drivers/misc/xilinx-ai-engine/Makefile
create mode 100644 drivers/misc/xilinx-ai-engine/ai-engine-aie.c
create mode 100644 drivers/misc/xilinx-ai-engine/ai-engine-dev.c
create mode 100644 drivers/misc/xilinx-ai-engine/ai-engine-internal.h
create mode 100644 drivers/misc/xilinx-ai-engine/ai-engine-part.c
create mode 100644 drivers/misc/xilinx-ai-engine/ai-engine-res.c
create mode 100644 include/uapi/linux/xlnx-ai-engine.h
diff --git a/MAINTAINERS b/MAINTAINERS
index 5cc595a..40e3351 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19283,6 +19283,14 @@ T: git https://github.com/Xilinx/linux-xlnx.git
F: Documentation/devicetree/bindings/phy/xlnx,zynqmp-psgtr.yaml
F: drivers/phy/xilinx/phy-zynqmp.c
+XILINX AI ENGINE DRIVER
+M: Wendy Liang <wendy.liang@xxxxxxxxxx>
+S: Supported
+F: Documentation/devicetree/bindings/soc/xilinx/xlnx,ai-engine.yaml
+F: drivers/misc/xilinx-ai-engine/
+F: include/linux/xlnx-ai-engine.h
+F: include/uapi/linux/xlnx-ai-engine.h
+
XILLYBUS DRIVER
M: Eli Billauer <eli.billauer@xxxxxxxxx>
L: linux-kernel@xxxxxxxxxxxxxxx
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index fafa8b0..0b8ce4d 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -444,6 +444,18 @@ config XILINX_SDFEC
If unsure, say N.
+config XILINX_AIE
+ tristate "Xilinx AI engine"
+ depends on ARM64 || COMPILE_TEST
+ help
+ This option enables support for the Xilinx AI engine driver.
+ One Xilinx AI engine device can have multiple partitions (groups of
+ AI engine tiles). Xilinx AI engine device driver instance manages
+ AI engine partitions. User application access its partitions through
+ AI engine partition instance file operations.
+
+ If unsure, say N
+
config MISC_RTSX
tristate
default MISC_RTSX_PCI || MISC_RTSX_USB
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index d23231e..2176b18 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -57,3 +57,4 @@ obj-$(CONFIG_HABANA_AI) += habanalabs/
obj-$(CONFIG_UACCE) += uacce/
obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o
obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o
+obj-$(CONFIG_XILINX_AIE) += xilinx-ai-engine/
diff --git a/drivers/misc/xilinx-ai-engine/Makefile b/drivers/misc/xilinx-ai-
engine/Makefile
new file mode 100644
index 0000000..7827a0a
--- /dev/null
+++ b/drivers/misc/xilinx-ai-engine/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for Xilinx AI engine device driver
+#
+
+obj-$(CONFIG_XILINX_AIE) += xilinx-aie.o
+
+xilinx-aie-$(CONFIG_XILINX_AIE) := ai-engine-aie.o \
+ ai-engine-dev.o \
+ ai-engine-part.o \
+ ai-engine-res.o
diff --git a/drivers/misc/xilinx-ai-engine/ai-engine-aie.c
b/drivers/misc/xilinx-ai-engine/ai-engine-aie.c
new file mode 100644
index 0000000..319260f
--- /dev/null
+++ b/drivers/misc/xilinx-ai-engine/ai-engine-aie.c
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx AI Engine driver AIE device specific implementation
+ *
+ * Copyright (C) 2020 Xilinx, Inc.
+ */
+
+#include <linux/slab.h>
+
+#include "ai-engine-internal.h"
+
+#define AIE_ARRAY_SHIFT 30U
+#define AIE_COL_SHIFT 23U
+#define AIE_ROW_SHIFT 18U
+
+/*
+ * Registers offsets
+ */
+#define AIE_SHIMNOC_L2INTR_MASK_REGOFF 0x00015000U
+#define AIE_SHIMNOC_L2INTR_INTR_REGOFF 0x00015010U
+#define AIE_SHIMNOC_DMA_BD0_ADDRLOW_REGOFF 0x0001d000U
+#define AIE_SHIMNOC_DMA_BD15_PACKET_REGOFF 0x0001d13cU
+#define AIE_SHIMNOC_AXIMM_REGOFF 0x0001e020U
+#define AIE_SHIMPL_L1INTR_MASK_A_REGOFF 0x00035000U
+#define AIE_SHIMPL_L1INTR_BLOCK_NORTH_B_REGOFF 0x00035050U
+#define AIE_SHIMPL_CLKCNTR_REGOFF 0x00036040U
+#define AIE_SHIMPL_RESET_REGOFF 0x0003604cU
+#define AIE_TILE_CORE_CLKCNTR_REGOFF 0x00036040U
+
+static const struct aie_tile_regs aie_kernel_regs[] = {
+ /* SHIM AXI MM Config */
+ {.attribute = AIE_TILE_TYPE_SHIMNOC << AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_SHIMNOC_AXIMM_REGOFF,
+ .eoff = AIE_SHIMNOC_AXIMM_REGOFF,
+ },
+ /* SHIM DMA ADDRESS range */
+ {.attribute = AIE_TILE_TYPE_SHIMNOC << AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_SHIMNOC_DMA_BD0_ADDRLOW_REGOFF,
+ .eoff = AIE_SHIMNOC_DMA_BD15_PACKET_REGOFF,
+ },
+ /* SHIM 2nd level interrupt controller */
+ {.attribute = AIE_TILE_TYPE_SHIMNOC << AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_SHIMNOC_L2INTR_MASK_REGOFF,
+ .eoff = AIE_SHIMNOC_L2INTR_INTR_REGOFF,
+ },
+ /* SHIM 1st level interrupt controller */
+ {.attribute = (AIE_TILE_TYPE_SHIMPL | AIE_TILE_TYPE_SHIMNOC) <<
+ AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_SHIMPL_L1INTR_MASK_A_REGOFF,
+ .eoff = AIE_SHIMPL_L1INTR_BLOCK_NORTH_B_REGOFF,
+ },
+ /* SHIM reset Enable */
+ {.attribute = (AIE_TILE_TYPE_SHIMPL | AIE_TILE_TYPE_SHIMNOC) <<
+ AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_SHIMPL_RESET_REGOFF,
+ .eoff = AIE_SHIMPL_RESET_REGOFF,
+ },
+ /* SHIM clock control */
+ {.attribute = (AIE_TILE_TYPE_SHIMPL | AIE_TILE_TYPE_SHIMNOC) <<
+ AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_SHIMPL_CLKCNTR_REGOFF,
+ .eoff = AIE_SHIMPL_CLKCNTR_REGOFF,
+ },
+ /* Tile clock control */
+ {.attribute = AIE_TILE_TYPE_TILE << AIE_REGS_ATTR_TILE_TYPE_SHIFT,
+ .soff = AIE_TILE_CORE_CLKCNTR_REGOFF,
+ .eoff = AIE_TILE_CORE_CLKCNTR_REGOFF,
+ },
+};
+
+static u32 aie_get_tile_type(struct aie_location *loc)
+{
+ if (loc->row)
+ return AIE_TILE_TYPE_TILE;
+ /* SHIM row */
+ if ((loc->col % 4) < 2)
+ return AIE_TILE_TYPE_SHIMPL;
+
+ return AIE_TILE_TYPE_SHIMNOC;
+}
+
+static const struct aie_tile_operations aie_ops = {
+ .get_tile_type = aie_get_tile_type,
+};
+
+/**
+ * aie_device_init() - Initialize AI engine device struct AIE specific
+ * properties
+ * @adev: AI engine device
+ * @return: 0 for success, negative value for failure.
+ *
+ * This function initialize the AI engine device structure device version
+ * specific elements such as register addressing related array shift,
+ * column shift, and row shift; AIE specific device operations, device
+ * columns resource.
+ */
+int aie_device_init(struct aie_device *adev)
+{
+ int ret;
+
+ adev->array_shift = AIE_ARRAY_SHIFT;
+ adev->col_shift = AIE_COL_SHIFT;
+ adev->row_shift = AIE_ROW_SHIFT;
+ adev->ops = &aie_ops;
+ adev->num_kernel_regs = ARRAY_SIZE(aie_kernel_regs);
+ adev->kernel_regs = aie_kernel_regs;
+
+ /* Get the columns resource */
+ /* Get number of columns from AI engine memory resource */
+ ret = aie_resource_initialize(&adev->cols_res, 50);
+ if (ret)
+ dev_err(&adev->dev, "failed to initialize columns
resource.\n");
+
+ return ret;
+}
diff --git a/drivers/misc/xilinx-ai-engine/ai-engine-dev.c
b/drivers/misc/xilinx-ai-engine/ai-engine-dev.c
new file mode 100644
index 0000000..2ab2dc8
--- /dev/null
+++ b/drivers/misc/xilinx-ai-engine/ai-engine-dev.c
@@ -0,0 +1,448 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx AI Engine device driver
+ *
+ * Copyright (C) 2020 Xilinx, Inc.
+ */
+
+#include <linux/anon_inodes.h>
+#include <linux/cdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/idr.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <uapi/linux/xlnx-ai-engine.h>
+
+#include "ai-engine-internal.h"
+
+#define AIE_DEV_MAX (MINORMASK + 1)
+
+static dev_t aie_major;
+struct class *aie_class;
+
+static DEFINE_IDA(aie_device_ida);
+static DEFINE_IDA(aie_minor_ida);
+
+/**
+ * aie_get_partition_fd() - Get AI engine partition file descriptor
+ * @apart: AI engine partition
+ * @return: file descriptor for AI engine partition for success, or negative
+ * value for failure.
+ *
+ * This function gets a file descriptor for the AI engine partition.
+ */
+static int aie_get_partition_fd(struct aie_partition *apart)
+{
+ struct file *filep;
+ int ret;
+
+ /*
+ * We can't use anon_inode_getfd() because we need to modify
+ * the f_mode flags directly to allow more than just ioctls
+ */
+ ret = get_unused_fd_flags(O_CLOEXEC);
+ if (ret < 0)
+ return ret;
+
+ filep = anon_inode_getfile(dev_name(&apart->dev), &aie_part_fops,
+ apart, O_RDWR);
+ if (IS_ERR(filep)) {
+ put_unused_fd(ret);
+ ret = PTR_ERR(filep);
+ return ret;
+ }
+ filep->f_mode |= (FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
+ fd_install(ret, filep);
+
+ return ret;
+}
+
+/**
+ * aie_enquire_partitions() - get AI engine partitions information
+ * @adev: AI engine device
+ * @query: data struct to store the partition information
+ * @return: 0 for success, and negative value for failure.
+ */
+static int aie_enquire_partitions(struct aie_device *adev,
+ struct aie_partition_query *query)
+{
+ struct aie_partition *apart;
+ u32 partition_cnt, i = 0;
+ int ret;
+
+ if (!query->partitions) {
+ /*
+ * If partitions information buffer is NULL.
+ * It is to get the number of partitions.
+ */
+ query->partition_cnt = 0;
+ list_for_each_entry(apart, &adev->partitions, node)
+ query->partition_cnt++;
+ return 0;
+ }
+
+ partition_cnt = query->partition_cnt;
+ if (!partition_cnt)
+ return 0;
+
+ ret = mutex_lock_interruptible(&adev->mlock);
+ if (ret)
+ return ret;
+
+ list_for_each_entry(apart, &adev->partitions, node) {
+ struct aie_range_args part;
+
+ if (i >= partition_cnt)
+ break;
+ part.partition_id = apart->partition_id;
+ /*
+ * TBD: check with PLM that if the partition is programmed
+ * and get the UID of the image which is loaded on the AI
+ * engine partition.
+ */
+ part.uid = 0;
+ part.range.start.col = apart->range.start.col;
+ part.range.start.row = apart->range.start.row;
+ part.range.size.col = apart->range.size.col;
+ part.range.size.row = apart->range.size.row;
+ /* Check if partition is in use */
+ part.status = apart->status;
+ if (copy_to_user((void __user *)&query->partitions[i], &part,
+ sizeof(part))) {
+ mutex_unlock(&adev->mlock);
+ return -EFAULT;
+ }
+ i++;
+ }
+ mutex_unlock(&adev->mlock);
+ query->partition_cnt = i;
+
+ return 0;
+}
+
+/**
+ * aie_get_partition_from_id() - get AI engine partition from id
+ * @adev: AI engine device
+ * @partition_id: partition id to check
+ * @return: partition pointer if partition exists, otherwise, NULL.
+ *
+ * This function checks defined partitions with partition id.
+ * This function expect the caller to lock mlock of @adev.
+ */
+struct aie_partition *aie_get_partition_from_id(struct aie_device *adev,
+ u32 partition_id)
+{
+ struct aie_partition *apart;
+
+ list_for_each_entry(apart, &adev->partitions, node) {
+ if (apart->partition_id == partition_id)
+ return apart;
+ }
+
+ return NULL;
+}
+
+/**
+ * aie_request_partition() - request AI engine partition
+ * @adev: AI engine device
+ * @req: partition request, includes the requested AI engine information
+ * such as partition node ID and the UID of the image which is
+ * loaded on the partition.
+ * @return: partition pointer if partition exists, otherwise, NULL.
+ *
+ * This function finds a defined partition which matches the specified
+ * partition id, request it if it hasn't been requested, and returns it.
+ */
+struct aie_partition *aie_request_partition(struct aie_device *adev,
+ struct aie_partition_req *req)
+{
+ struct aie_partition *apart;
+ int ret;
+
+ ret = mutex_lock_interruptible(&adev->mlock);
+ if (ret)
+ return ERR_PTR(ret);
+
+ apart = aie_get_partition_from_id(adev, req->partition_id);
+ if (!apart) {
+ dev_err(&adev->dev,
+ "request partition %u failed, not exist.\n",
+ req->partition_id);
+ mutex_unlock(&adev->mlock);
+ return ERR_PTR(-EINVAL);
+ }
+ /*
+ * TBD: It will check image UID too to see if the user matches
+ * what's loaded in the AI engine partition. And check the meta
+ * data to see which resources used by application.
+ */
+
+ ret = mutex_lock_interruptible(&apart->mlock);
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (apart->status & XAIE_PART_STATUS_INUSE) {
+ mutex_unlock(&apart->mlock);
+ dev_err(&adev->dev,
+ "request partition %u failed, partition in use.\n",
+ req->partition_id);
+ apart = ERR_PTR(-EBUSY);
+ } else {
+ /*
+ * TBD:
+ * 1. setup NOC AXI MM config to only generate error events
+ * for slave error and decode error.
+ * 2. scan to see which tiles have been clock gated.
+ *
+ * This needs to be done before the AI engine partition is
+ * exported for user to access.
+ */
+ apart->status = XAIE_PART_STATUS_INUSE;
+ mutex_unlock(&apart->mlock);
+ }
+ mutex_unlock(&adev->mlock);
+
+ return apart;
+}
+
+static long xilinx_ai_engine_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct aie_device *adev = cdev_to_aiedev(inode->i_cdev);
+ void __user *argp = (void __user *)arg;
+ int ret;
+
+ switch (cmd) {
+ case AIE_ENQUIRE_PART_IOCTL:
+ {
+ struct aie_partition_query query;
+ struct aie_partition_query __user *uquery_ptr = argp;
+
+ if (copy_from_user(&query, uquery_ptr, sizeof(query)))
+ return -EFAULT;
+ ret = aie_enquire_partitions(adev, &query);
+ if (ret < 0)
+ return ret;
+ if (copy_to_user((void __user *)&uquery_ptr->partition_cnt,
+ &query.partition_cnt,
+ sizeof(query.partition_cnt)))
+ return -EFAULT;
+ break;
+ }
+ case AIE_REQUEST_PART_IOCTL:
+ {
+ struct aie_partition_req req;
+ struct aie_partition *apart;
+
+ if (copy_from_user(&req, argp, sizeof(req)))
+ return -EFAULT;
+ apart = aie_request_partition(adev, &req);
+ if (IS_ERR(apart))
+ return PTR_ERR(apart);
+ ret = aie_get_partition_fd(apart);
+ if (ret < 0) {
+ dev_err(&apart->dev, "failed to get fd.\n");
+ break;
+ }
+ break;
+ }
+ default:
+ dev_err(&adev->dev, "Invalid ioctl command %u.\n", cmd);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static const struct file_operations aie_device_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = xilinx_ai_engine_ioctl,
+};
+
+static void xilinx_ai_engine_release_device(struct device *dev)
+{
+ struct aie_device *adev = dev_to_aiedev(dev);
+
+ ida_simple_remove(&aie_device_ida, dev->id);
+ ida_simple_remove(&aie_minor_ida, MINOR(dev->devt));
+ cdev_del(&adev->cdev);
+ aie_resource_uninitialize(&adev->cols_res);
+}
+
+/**
+ * of_xilinx_ai_engine_part_probe() - probes for AI engine partition nodes
+ * @adev: AI engine device
+ *
+ * This function will probe for children AI engine partition nodes and create
+ * an AI engine partition instance for each node.
+ */
+static void of_xilinx_ai_engine_part_probe(struct aie_device *adev)
+{
+ struct device_node *nc;
+
+ for_each_available_child_of_node(adev->dev.of_node, nc) {
+ struct aie_partition *apart;
+
+ if (of_node_test_and_set_flag(nc, OF_POPULATED))
+ continue;
+ apart = of_aie_part_probe(adev, nc);
+ if (IS_ERR(apart)) {
+ dev_err(&adev->dev,
+ "Failed to probe AI engine part for %pOF\n",
+ nc);
+ of_node_clear_flag(nc, OF_POPULATED);
+ }
+ }
+}
+
+static int xilinx_ai_engine_probe(struct platform_device *pdev)
+{
+ struct aie_device *adev;
+ struct device *dev;
+ int ret;
+
+ adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, adev);
+ INIT_LIST_HEAD(&adev->partitions);
+ mutex_init(&adev->mlock);
+
+ adev->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!adev->res) {
+ dev_err(&pdev->dev, "No memory resource.\n");
+ return -EINVAL;
+ }
+ adev->base = devm_ioremap_resource(&pdev->dev, adev->res);
+ if (IS_ERR(adev->base)) {
+ dev_err(&pdev->dev, "no io memory resource.\n");
+ return PTR_ERR(adev->base);
+ }
+
+ /* Initialize AIE device specific instance. */
+ ret = aie_device_init(adev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to initialize device
instance.\n");
+ return ret;
+ }
+
+ dev = &adev->dev;
+ device_initialize(dev);
+ dev->class = aie_class;
+ dev->parent = &pdev->dev;
+ dev->of_node = pdev->dev.of_node;
+
+ ret = ida_simple_get(&aie_minor_ida, 0, AIE_DEV_MAX, GFP_KERNEL);
+ if (ret < 0)
+ goto free_dev;
+ dev->devt = MKDEV(MAJOR(aie_major), ret);
+ ret = ida_simple_get(&aie_device_ida, 0, 0, GFP_KERNEL);
+ if (ret < 0)
+ goto free_minor_ida;
+ dev->id = ret;
+ dev_set_name(&adev->dev, "aie%d", dev->id);
+
+ cdev_init(&adev->cdev, &aie_device_fops);
+ adev->cdev.owner = THIS_MODULE;
+ ret = cdev_add(&adev->cdev, dev->devt, 1);
+ if (ret)
+ goto free_ida;
+ /* We can now rely on the release function for cleanup */
+ dev->release = xilinx_ai_engine_release_device;
+
+ ret = device_add(dev);
+ if (ret) {
+ dev_err(&pdev->dev, "device_add failed: %d\n", ret);
+ put_device(dev);
+ return ret;
+ }
+
+ of_xilinx_ai_engine_part_probe(adev);
+ dev_info(&pdev->dev, "Xilinx AI Engine device(cols=%u) probed\n",
+ adev->cols_res.total);
+ return 0;
+
+free_ida:
+ ida_simple_remove(&aie_device_ida, dev->id);
+free_minor_ida:
+ ida_simple_remove(&aie_minor_ida, MINOR(dev->devt));
+free_dev:
+ put_device(dev);
+
+ return ret;
+}
+
+static int xilinx_ai_engine_remove(struct platform_device *pdev)
+{
+ struct aie_device *adev = platform_get_drvdata(pdev);
+ struct aie_partition *apart;
+
+ list_for_each_entry(apart, &adev->partitions, node)
+ aie_part_remove(apart);
+
+ device_del(&adev->dev);
+ put_device(&adev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id xilinx_ai_engine_of_match[] = {
+ { .compatible = "xlnx,ai-engine-v1.0", },
+ { /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, xilinx_ai_engine_of_match);
+
+static struct platform_driver xilinx_ai_engine_driver = {
+ .probe = xilinx_ai_engine_probe,
+ .remove = xilinx_ai_engine_remove,
+ .driver = {
+ .name = "xilinx-ai-engine",
+ .of_match_table = xilinx_ai_engine_of_match,
+ },
+};
+
+static int __init xilinx_ai_engine_init(void)
+{
+ int ret;
+
+ ret = alloc_chrdev_region(&aie_major, 0, AIE_DEV_MAX, "aie");
+ if (ret < 0) {
+ pr_err("aie: failed to allocate aie region\n");
+ return ret;
+ }
+
+ aie_class = class_create(THIS_MODULE, "aie");
+ if (IS_ERR(aie_class)) {
+ pr_err("failed to create aie class\n");
+ unregister_chrdev_region(aie_major, AIE_DEV_MAX);
+ return PTR_ERR(aie_class);
+ }
+
+ platform_driver_register(&xilinx_ai_engine_driver);
+
+ return 0;
+}
+postcore_initcall(xilinx_ai_engine_init);
+
+static void __exit xilinx_ai_engine_exit(void)
+{
+ platform_driver_unregister(&xilinx_ai_engine_driver);
+ class_destroy(aie_class);
+ unregister_chrdev_region(aie_major, AIE_DEV_MAX);
+}
+module_exit(xilinx_ai_engine_exit);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/misc/xilinx-ai-engine/ai-engine-internal.h
b/drivers/misc/xilinx-ai-engine/ai-engine-internal.h
new file mode 100644
index 0000000..6a69946
--- /dev/null
+++ b/drivers/misc/xilinx-ai-engine/ai-engine-internal.h
@@ -0,0 +1,226 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Xilinx AI Engine driver internal header
+ *
+ * Copyright (C) 2020 Xilinx, Inc.
+ */
+
+#ifndef AIE_INTERNAL_H
+#define AIE_INTERNAL_H
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <uapi/linux/xlnx-ai-engine.h>
+
+/*
+ * Macros for AI engine tile type bitmasks
+ */
+#define AIE_TILE_TYPE_TILE BIT(0)
+#define AIE_TILE_TYPE_SHIMPL BIT(1)
+/* SHIM NOC tile includes SHIM PL and SHIM NOC modules */
+#define AIE_TILE_TYPE_SHIMNOC BIT(2)
+
+/*
+ * Macros for attribute property of AI engine registers accessed by kernel
+ * 0 - 7 bits: tile type bits
+ * 8 - 15 bits: permission bits. If it is 1, it allows write from userspace
+ */
+#define AIE_REGS_ATTR_TILE_TYPE_SHIFT 0U
+#define AIE_REGS_ATTR_PERM_SHIFT 8U
+#define AIE_REGS_ATTR_TILE_TYPE_MASK GENMASK(AIE_REGS_ATTR_PERM_SHIFT - 1,
\
+ AIE_REGS_ATTR_TILE_TYPE_SHIFT)
+#define AIE_REGS_ATTR_PERM_MASK GENMASK(15, \
+ AIE_REGS_ATTR_PERM_SHIFT)
+
+/**
+ * struct aie_tile_regs - contiguous range of AI engine register
+ * within an AI engine tile
+ * @soff: start offset of the range
+ * @eoff: end offset of the range
+ * @attribute: registers attribute. It uses AIE_REGS_ATTR_* macros defined
+ * above.
+ */
+struct aie_tile_regs {
+ size_t soff;
+ size_t eoff;
+ u32 attribute;
+};
+
+struct aie_device;
+struct aie_partition;
+
+/**
+ * struct aie_tile_operations - AI engine device operations
+ * @get_tile_type: get type of tile based on tile operation
+ *
+ * Different AI engine device version has its own device
+ * operation.
+ */
+struct aie_tile_operations {
+ u32 (*get_tile_type)(struct aie_location *loc);
+};
+
+/**
+ * struct aie_resource - AI engine resource structure
+ * @bitmap: resource bitmap
+ * @total: total number of resource
+ */
+struct aie_resource {
+ unsigned long *bitmap;
+ u32 total;
+};
+
+/**
+ * struct aie_device - AI engine device structure
+ * @partitions: list of partitions requested
+ * @cdev: cdev for the AI engine
+ * @dev: device for the AI engine device
+ * @mlock: protection for AI engine device operations
+ * @base: AI engine device base virtual address
+ * @res: memory resource of AI engine device
+ * @kernel_regs: array of kernel only registers
+ * @ops: tile operations
+ * @size: size of the AI engine address space
+ * @array_shift: array address shift
+ * @col_shift: column address shift
+ * @row_shift: row address shift
+ * @cols_res: AI engine columns resources to indicate
+ * while columns are occupied by partitions.
+ * @num_kernel_regs: number of kernel only registers range
+ * @version: AI engine device version
+ */
+struct aie_device {
+ struct list_head partitions;
+ struct cdev cdev;
+ struct device dev;
+ struct mutex mlock; /* protection for AI engine partitions */
+ void __iomem *base;
+ struct resource *res;
+ const struct aie_tile_regs *kernel_regs;
+ const struct aie_tile_operations *ops;
+ size_t size;
+ struct aie_resource cols_res;
+ u32 array_shift;
+ u32 col_shift;
+ u32 row_shift;
+ u32 num_kernel_regs;
+ int version;
+};
+
+/**
+ * struct aie_partition - AI engine partition structure
+ * @node: list node
+ * @adev: pointer to AI device instance
+ * @range: range of partition
+ * @mlock: protection for AI engine partition operations
+ * @dev: device for the AI engine partition
+ * @partition_id: partition id. Partition ID is the identifier
+ * of the AI engine partition in the system.
+ * @status: indicate if the partition is in use
+ */
+struct aie_partition {
+ struct list_head node;
+ struct aie_device *adev;
+ struct aie_range range;
+ struct mutex mlock; /* protection for AI engine partition operations
*/
+ struct device dev;
+ u32 partition_id;
+ u32 status;
+};
+
+extern struct class *aie_class;
+extern const struct file_operations aie_part_fops;
+
+#define cdev_to_aiedev(i_cdev) container_of((i_cdev), struct aie_device,
cdev)
+#define dev_to_aiedev(_dev) container_of((_dev), struct aie_device, dev)
+#define dev_to_aiepart(_dev) container_of((_dev), struct aie_partition, dev)
+
+#define aie_col_mask(adev) ({ \
+ struct aie_device *_adev = (adev); \
+ GENMASK_ULL(_adev->array_shift - 1, _adev->col_shift); \
+ })
+
+#define aie_row_mask(adev) ({ \
+ struct aie_device *_adev = (adev); \
+ GENMASK_ULL(_adev->col_shift - 1, _adev->row_shift); \
+ })
+
+#define aie_tile_reg_mask(adev) ({ \
+ struct aie_device *_adev = (adev); \
+ GENMASK_ULL(_adev->row_shift - 1, 0); \
+ })
+
+/*
+ * Need to define field get, as AI engine shift mask is not constant.
+ * Cannot use FIELD_GET()
+ */
+#define aie_tile_reg_field_get(mask, shift, regoff) ( \
+ ((regoff) & (mask)) >> (shift))
+
+#define aie_cal_tile_reg(adev, regoff) ( \
+ aie_tile_reg_field_get(aie_tile_reg_mask(adev), 0, regoff))
+
+/**
+ * aie_cal_regoff() - calculate register offset to the whole AI engine
+ * device start address
+ * @adev: AI engine device
+ * @loc: AI engine tile location
+ * @regoff_intile: register offset within a tile
+ * @return: register offset to the whole AI engine device start address
+ */
+static inline u32 aie_cal_regoff(struct aie_device *adev,
+ struct aie_location loc, u32 regoff_intile)
+{
+ return regoff_intile + (loc.col << adev->col_shift) +
+ (loc.row << adev->row_shift);
+}
+
+/**
+ * aie_validate_location() - validate tile location within an AI engine
+ * partition
+ * @apart: AI engine partition
+ * @loc: AI engine tile location
+ * @return: return 0 if it is valid, negative value for errors.
+ *
+ * This function checks if the AI engine location is within the AI engine
+ * partition.
+ */
+static inline int aie_validate_location(struct aie_partition *apart,
+ struct aie_location loc)
+{
+ if (loc.col < apart->range.start.col ||
+ loc.col >= apart->range.start.col + apart->range.size.col ||
+ loc.row < apart->range.start.row ||
+ loc.row >= apart->range.start.row + apart->range.size.row)
+ return -EINVAL;
+
+ return 0;
+}
+
+int aie_resource_initialize(struct aie_resource *res, int count);
+void aie_resource_uninitialize(struct aie_resource *res);
+int aie_resource_check_region(struct aie_resource *res, u32 start,
+ u32 count);
+int aie_resource_get_region(struct aie_resource *res, u32 start,
+ u32 count);
+void aie_resource_put_region(struct aie_resource *res, int start, u32 count);
+
+const struct file_operations *aie_part_get_fops(void);
+u8 aie_part_in_use(struct aie_partition *apart);
+struct aie_partition *aie_get_partition_from_id(struct aie_device *adev,
+ u32 partition_id);
+struct aie_partition *aie_request_partition(struct aie_device *adev,
+ struct aie_partition_req *req);
+struct aie_partition *of_aie_part_probe(struct aie_device *adev,
+ struct device_node *nc);
+void aie_part_remove(struct aie_partition *apart);
+
+int aie_device_init(struct aie_device *adev);
+#endif /* AIE_INTERNAL_H */
diff --git a/drivers/misc/xilinx-ai-engine/ai-engine-part.c
b/drivers/misc/xilinx-ai-engine/ai-engine-part.c
new file mode 100644
index 0000000..fc8f9f5
--- /dev/null
+++ b/drivers/misc/xilinx-ai-engine/ai-engine-part.c
@@ -0,0 +1,498 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx AI Engine partition driver
+ *
+ * Copyright (C) 2020 Xilinx, Inc.
+ */
+
+#include <linux/cdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/mmu_context.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/uio.h>
+#include <uapi/linux/xlnx-ai-engine.h>
+
+#include "ai-engine-internal.h"
+
+/**
+ * aie_cal_loc() - calculate tile location from register offset to the AI
+ * engine device
+ * @adev: AI engine device
+ * @loc: memory pointer to restore returning location information
+ * @regoff: tile internal register offset
+ *
+ * This function returns the tile location.
+ */
+static void aie_cal_loc(struct aie_device *adev,
+ struct aie_location *loc, u64 regoff)
+{
+ loc->col = (u32)aie_tile_reg_field_get(aie_col_mask(adev),
+ adev->col_shift, regoff);
+ loc->row = (u32)aie_tile_reg_field_get(aie_row_mask(adev),
+ adev->row_shift, regoff);
+}
+
+/**
+ * aie_part_reg_validation() - validate AI engine partition register access
+ * @apart: AI engine partition
+ * @offset: AI engine register offset
+ * @len: len of data to write/read
+ * @is_write: is the access to write to register
+ * @return: 0 for success, or negative value for failure.
+ *
+ * This function validate if the register to access is within the AI engine
+ * partition. If it is write access, if the register is writable by user.
+ */
+static int aie_part_reg_validation(struct aie_partition *apart, size_t
offset,
+ size_t len, u8 is_write)
+{
+ struct aie_device *adev;
+ u32 regend32, ttype;
+ u64 regoff, regend64;
+ struct aie_location loc;
+ unsigned int i;
+
+ adev = apart->adev;
+ if (offset % sizeof(u32)) {
+ dev_err(&apart->dev,
+ "Invalid reg off(0x%zx), not 32bit aligned.\n",
+ offset);
+ return -EINVAL;
+ }
+
+ if (len % sizeof(u32)) {
+ dev_err(&apart->dev, "Invalid reg operation len %zu.\n", len);
+ return -EINVAL;
+ }
+
+ regoff = aie_cal_tile_reg(adev, offset);
+ regend64 = regoff + len;
+ if (regend64 >= BIT_ULL(adev->row_shift)) {
+ dev_err(&apart->dev,
+ "Invalid reg operation len %zu.\n", len);
+ return -EINVAL;
+ }
+
+ aie_cal_loc(adev, &loc, offset);
+ if (aie_validate_location(apart, loc)) {
+ dev_err(&apart->dev,
+ "Invalid (%d,%d) out of part(%d,%d),(%d,%d)\n",
+ loc.col, loc.row,
+ apart->range.start.col, apart->range.start.row,
+ apart->range.size.col, apart->range.size.row);
+ return -EINVAL;
+ }
+
+ if (!is_write)
+ return 0;
+
+ regend32 = lower_32_bits(regend64);
+ ttype = adev->ops->get_tile_type(&loc);
+ for (i = 0; i < adev->num_kernel_regs; i++) {
+ const struct aie_tile_regs *regs;
+ u32 rttype, writable;
+
+ regs = &adev->kernel_regs[i];
+ rttype = (regs->attribute & AIE_REGS_ATTR_TILE_TYPE_MASK) >>
+ AIE_REGS_ATTR_TILE_TYPE_SHIFT;
+ writable = (regs->attribute & AIE_REGS_ATTR_PERM_MASK) >>
+ AIE_REGS_ATTR_PERM_SHIFT;
+ if (!(ttype & rttype))
+ continue;
+ if ((regoff >= regs->soff && regoff <= regs->eoff) ||
+ (regend32 >= regs->soff && regend32 <= regs->eoff)) {
+ if (!writable) {
+ dev_err(&apart->dev,
+ "reg 0x%zx,0x%zx not writable.\n",
+ offset, len);
+ return -EINVAL;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * aie_part_write_register() - AI engine partition write register
+ * @apart: AI engine partition
+ * @offset: AI engine register offset
+ * @len: len of data to write
+ * @data: data to write
+ * @mask: mask, if it is non 0, it is mask write.
+ * @return: number of bytes write for success, or negative value for failure.
+ *
+ * This function writes data to the specified registers.
+ * If the mask is non 0, it is mask write.
+ */
+static int aie_part_write_register(struct aie_partition *apart, size_t
offset,
+ size_t len, void *data, u32 mask)
+{
+ int ret;
+ void __iomem *va;
+
+ if (mask && len > sizeof(u32)) {
+ /* For mask write, only allow 32bit. */
+ dev_err(&apart->dev,
+ "failed mask write, len is more that 32bit.\n");
+ return -EINVAL;
+ }
+
+ /* offset is expected to be relative to the start of the partition */
+ offset += aie_cal_regoff(apart->adev, apart->range.start, 0);
+ ret = aie_part_reg_validation(apart, offset, len, 1);
+ if (ret < 0) {
+ dev_err(&apart->dev, "failed to write to 0x%zx,0x%zx.\n",
+ offset, len);
+ return ret;
+ }
+
+ va = apart->adev->base + offset;
+ if (!mask) {
+ if (len == sizeof(u32))
+ iowrite32(*((u32 *)data), va);
+ else
+ memcpy_toio(va, data, len);
+ } else {
+ u32 val = ioread32(va);
+
+ val &= ~mask;
+ val |= *((u32 *)data) & mask;
+ iowrite32(val, va);
+ }
+
+ return (int)len;
+}
+
+/**
+ * aie_part_access_regs() - AI engine partition registers access
+ * @apart: AI engine partition
+ * @num_reqs: number of access requests
+ * @reqs: array of registers access
+ * @return: 0 for success, and negative value for failure.
+ *
+ * This function executes AI engine partition register access requests.
+ */
+static int aie_part_access_regs(struct aie_partition *apart, u32 num_reqs,
+ struct aie_reg_args *reqs)
+{
+ u32 i;
+
+ for (i = 0; i < num_reqs; i++) {
+ struct aie_reg_args *args = &reqs[i];
+ int ret;
+
+ if (args->op != AIE_REG_WRITE) {
+ dev_err(&apart->dev,
+ "Invalid register command type: %u.\n",
+ args->op);
+ return -EINVAL;
+ }
+ ret = aie_part_write_register(apart,
+ (size_t)args->offset,
+ sizeof(args->val),
+ &args->val, args->mask);
+ if (ret < 0) {
+ dev_err(&apart->dev, "reg op %u failed: 0x%llx.\n",
+ args->op, args->offset);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int aie_part_release(struct inode *inode, struct file *filp)
+{
+ struct aie_partition *apart = filp->private_data;
+ int ret;
+
+ /*
+ * TODO: It will need to reset the SHIM columns and gate the
+ * tiles of the partition.
+ */
+ ret = mutex_lock_interruptible(&apart->mlock);
+ if (ret)
+ return ret;
+
+ apart->status = 0;
+ mutex_unlock(&apart->mlock);
+
+ return 0;
+}
+
+static const struct vm_operations_struct aie_part_physical_vm_ops = {
+#ifdef CONFIG_HAVE_IOREMAP_PROT
+ .access = generic_access_phys,
+#endif
+};
+
+static int aie_part_mmap(struct file *fp, struct vm_area_struct *vma)
+{
+ struct aie_partition *apart = fp->private_data;
+ struct aie_device *adev = apart->adev;
+ unsigned long offset = vma->vm_pgoff * PAGE_SIZE;
+ phys_addr_t addr;
+ size_t size;
+
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ /* Only allow userspace directly read registers */
+ if (vma->vm_flags & VM_WRITE) {
+ dev_err(&apart->dev, "%s: do not support writable mmap.\n",
+ __func__);
+ return -EINVAL;
+ }
+ vma->vm_private_data = apart;
+ vma->vm_ops = &aie_part_physical_vm_ops;
+ size = apart->range.size.col << adev->col_shift;
+ if ((vma->vm_end - vma->vm_start) > (size - offset)) {
+ dev_err(&apart->dev,
+ "%s: size exceed.\n", __func__);
+ return -EINVAL;
+ }
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ /* Calculate the partition address */
+ addr = adev->res->start;
+ addr += apart->range.start.col << adev->col_shift;
+ addr += apart->range.start.row << adev->row_shift;
+ addr += offset;
+ return remap_pfn_range(vma,
+ vma->vm_start,
+ addr >> PAGE_SHIFT,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot);
+}
+
+static long aie_part_ioctl(struct file *fp, unsigned int cmd, unsigned long
arg)
+{
+ struct aie_partition *apart = fp->private_data;
+ void __user *argp = (void __user *)arg;
+ long ret;
+
+ switch (cmd) {
+ case AIE_REG_IOCTL:
+ {
+ struct aie_reg_args raccess;
+
+ if (copy_from_user(&raccess, argp, sizeof(raccess)))
+ return -EFAULT;
+
+ ret = mutex_lock_interruptible(&apart->mlock);
+ if (ret)
+ return ret;
+
+ ret = aie_part_access_regs(apart, 1, &raccess);
+ mutex_unlock(&apart->mlock);
+ break;
+ }
+ default:
+ dev_err(&apart->dev, "Invalid ioctl command %u.\n", cmd);
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+const struct file_operations aie_part_fops = {
+ .owner = THIS_MODULE,
+ .release = aie_part_release,
+ .mmap = aie_part_mmap,
+ .unlocked_ioctl = aie_part_ioctl,
+};
+
+/**
+ * aie_part_release_device() - release an AI engine partition instance
+ * @dev: AI engine partition device
+ *
+ * It will be called by device driver core when no one holds a valid
+ * pointer to @dev anymore.
+ */
+static void aie_part_release_device(struct device *dev)
+{
+ struct aie_partition *apart = dev_to_aiepart(dev);
+ struct aie_device *adev = apart->adev;
+ int ret;
+
+ ret = mutex_lock_interruptible(&adev->mlock);
+ if (ret) {
+ dev_warn(&apart->dev,
+ "getting adev->mlock is interrupted by signal\n");
+ }
+
+ aie_resource_put_region(&adev->cols_res, apart->range.start.col,
+ apart->range.size.col);
+ list_del(&apart->node);
+ mutex_unlock(&adev->mlock);
+ put_device(apart->dev.parent);
+}
+
+/**
+ * aie_create_partition() - create AI engine partition instance
+ * @adev: AI engine device
+ * @range: AI engine partition range to check. A range describes a group
+ * of AI engine tiles.
+ * @return: created AI engine partition pointer for success, and PTR_ERR
+ * for failure.
+ *
+ * This function creates an AI engine partition instance.
+ * It creates AI engine partition, the AI engine partition device and
+ * the AI engine partition character device.
+ */
+static struct aie_partition *aie_create_partition(struct aie_device *adev,
+ struct aie_range *range)
+{
+ struct aie_partition *apart;
+ struct device *dev;
+ char devname[32];
+ int ret;
+
+ ret = mutex_lock_interruptible(&adev->mlock);
+ if (ret)
+ return ERR_PTR(ret);
+
+ ret = aie_resource_check_region(&adev->cols_res, range->start.col,
+ range->size.col);
+ if (ret != range->start.col) {
+ dev_err(&adev->dev, "invalid partition (%u,%u)(%u,%u).\n",
+ range->start.col, range->start.row,
+ range->size.col, range->size.row);
+ mutex_unlock(&adev->mlock);
+ return ERR_PTR(-EINVAL);
+ }
+ ret = aie_resource_get_region(&adev->cols_res, range->start.col,
+ range->size.col);
+ if (ret != range->start.col) {
+ dev_err(&adev->dev, "failed to get partition
(%u,%u)(%u,%u).\n",
+ range->start.col, range->start.row,
+ range->size.col, range->size.row);
+ mutex_unlock(&adev->mlock);
+ return ERR_PTR(-EFAULT);
+ }
+ mutex_unlock(&adev->mlock);
+
+ apart = devm_kzalloc(&adev->dev, sizeof(*apart), GFP_KERNEL);
+ if (!apart)
+ return ERR_PTR(-ENOMEM);
+
+ apart->adev = adev;
+ memcpy(&apart->range, range, sizeof(*range));
+ mutex_init(&apart->mlock);
+
+ /* Create AI engine partition device */
+ dev = &apart->dev;
+ device_initialize(dev);
+ dev->parent = &adev->dev;
+ dev->class = aie_class;
+ dev_set_drvdata(dev, apart);
+ snprintf(devname, sizeof(devname) - 1, "aiepart_%d_%d",
+ apart->range.start.col, apart->range.size.col);
+ dev_set_name(dev, devname);
+ /* We can now rely on the release function for cleanup */
+ dev->release = aie_part_release_device;
+ ret = device_add(dev);
+ if (ret) {
+ dev_err(dev, "device_add failed: %d\n", ret);
+ put_device(dev);
+ return ERR_PTR(ret);
+ }
+
+ ret = mutex_lock_interruptible(&adev->mlock);
+ if (ret) {
+ put_device(dev);
+ return ERR_PTR(ret);
+ }
+
+ list_add_tail(&apart->node, &adev->partitions);
+ mutex_unlock(&adev->mlock);
+ get_device(&adev->dev);
+ dev_dbg(dev, "created AIE partition device.\n");
+
+ return apart;
+}
+
+struct aie_partition *
+of_aie_part_probe(struct aie_device *adev, struct device_node *nc)
+{
+ struct aie_partition *apart;
+ struct aie_range range;
+ u32 partition_id, regs[4];
+ int ret;
+
+ /* Select device driver */
+ ret = of_property_read_u32_array(nc, "reg", regs, ARRAY_SIZE(regs));
+ if (ret < 0) {
+ dev_err(&adev->dev,
+ "probe %pOF failed, no tiles range information.\n",
+ nc);
+ return ERR_PTR(ret);
+ }
+ range.start.col = regs[0];
+ range.start.row = regs[1];
+ range.size.col = regs[2];
+ range.size.row = regs[3];
+
+ ret = of_property_read_u32_index(nc, "xlnx,partition-id", 0,
+ &partition_id);
+ if (ret < 0) {
+ dev_err(&adev->dev,
+ "probe %pOF failed, no partition id.\n", nc);
+ return ERR_PTR(ret);
+ }
+
+ ret = mutex_lock_interruptible(&adev->mlock);
+ if (ret)
+ return ERR_PTR(ret);
+
+ apart = aie_get_partition_from_id(adev, partition_id);
+ mutex_unlock(&adev->mlock);
+ if (apart) {
+ dev_err(&adev->dev,
+ "probe failed: partition %u exists.\n",
+ partition_id);
+ return ERR_PTR(ret);
+ }
+
+ apart = aie_create_partition(adev, &range);
+ if (IS_ERR(apart)) {
+ dev_err(&adev->dev,
+ "%s: failed to create part(%u,%u),(%u,%u).\n",
+ __func__, range.start.col, range.start.row,
+ range.size.col, range.size.row);
+ return apart;
+ }
+
+ of_node_get(nc);
+ apart->dev.of_node = nc;
+ apart->partition_id = partition_id;
+
+ dev_info(&adev->dev,
+ "AI engine part(%u,%u),(%u,%u), id %u is probed
successfully.\n",
+ range.start.col, range.start.row,
+ range.size.col, range.size.row, apart->partition_id);
+
+ return apart;
+}
+
+/**
+ * aie_destroy_part() - destroy AI engine partition
+ * @apart: AI engine partition
+ *
+ * This function will remove AI engine partition.
+ */
+void aie_part_remove(struct aie_partition *apart)
+{
+ device_del(&apart->dev);
+ put_device(&apart->dev);
+}
diff --git a/drivers/misc/xilinx-ai-engine/ai-engine-res.c
b/drivers/misc/xilinx-ai-engine/ai-engine-res.c
new file mode 100644
index 0000000..36f08bf
--- /dev/null
+++ b/drivers/misc/xilinx-ai-engine/ai-engine-res.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx AI Engine device driver
+ *
+ * Copyright (C) 2020 Xilinx, Inc.
+ */
+
+#include <linux/bitmap.h>
+
+#include "ai-engine-internal.h"
+
+/**
+ * aie_resource_initialize() - initialize AI engine resource
+ * @res: pointer to AI engine resource
+ * @count: total number of element of this resource
+ * @return: 0 for success, negative value for failure.
+ *
+ * This function will initialize the data structure for the
+ * resource.
+ */
+int aie_resource_initialize(struct aie_resource *res, int count)
+{
+ if (!res || !count)
+ return -EINVAL;
+ res->bitmap = bitmap_zalloc(count, GFP_KERNEL);
+ if (!res->bitmap)
+ return -ENOMEM;
+ res->total = count;
+
+ return 0;
+}
+
+/**
+ * aie_resource_uninitialize() - uninitialize AI engine resource
+ * @res: pointer to AI engine resource
+ *
+ * This function will release the AI engine resource data members.
+ */
+void aie_resource_uninitialize(struct aie_resource *res)
+{
+ res->total = 0;
+ if (res->bitmap)
+ bitmap_free(res->bitmap);
+}
+
+/**
+ * aie_resource_check() - check availability of requested resource
+ * @res: pointer to AI engine resource to check
+ * @start: start index of the required resource, it will only be used if
+ * @continuous is 1. It will check the available resource starting
from
+ * @start
+ * @count: number of requested element
+ * @return: start resource id if the requested number of resources are
available
+ * It will return negative value of errors.
+ *
+ * This function will check the availability. It will return start resource
id
+ * if the requested number of resources are available.
+ */
+int aie_resource_check_region(struct aie_resource *res,
+ u32 start, u32 count)
+{
+ unsigned long id;
+
+ if (!res || !res->bitmap || !count)
+ return -EINVAL;
+ id = bitmap_find_next_zero_area(res->bitmap, res->total, start,
+ count, 0);
+ if (id >= res->total)
+ return -ERANGE;
+
+ return (int)id;
+}
+
+/**
+ * aie_resource_get_region() - get requested AI engine resource
+ * @res: pointer to AI engine resource to check
+ * @count: number of requested element
+ * @start: start index of the required resource
+ * @return: start resource id for success, and negative value for failure.
+ *
+ * This function check if the requested AI engine resource is available.
+ * If it is available, mark it used and return the start resource id.
+ */
+int aie_resource_get_region(struct aie_resource *res, u32 start, u32 count)
+{
+ unsigned long off;
+
+ if (!res || !res->bitmap || !count)
+ return -EINVAL;
+ off = bitmap_find_next_zero_area(res->bitmap, res->total, start,
+ count, 0);
+ if (off >= res->total) {
+ pr_err("Failed to get available AI engine resource.\n");
+ return -ERANGE;
+ }
+ bitmap_set(res->bitmap, off, count);
+
+ return (int)off;
+}
+
+/**
+ * aie_resource_put_region() - release requested AI engine resource
+ * @res: pointer to AI engine resource to check
+ * @start: start index of the resource to release
+ * @count: number of elements to release
+ *
+ * This function release the requested AI engine resource.
+ */
+void aie_resource_put_region(struct aie_resource *res, int start, u32 count)
+{
+ if (!res || !count)
+ return;
+ bitmap_clear(res->bitmap, start, count);
+}
diff --git a/include/uapi/linux/xlnx-ai-engine.h b/include/uapi/linux/xlnx-ai-
engine.h
new file mode 100644
index 0000000..acbc781
--- /dev/null
+++ b/include/uapi/linux/xlnx-ai-engine.h
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (c) 2020, Xilinx Inc.
+ */
+
+#ifndef _UAPI_AI_ENGINE_H_
+#define _UAPI_AI_ENGINE_H_
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+enum aie_reg_op {
+ AIE_REG_WRITE,
+};
+
+/* AI engine partition is in use */
+#define XAIE_PART_STATUS_INUSE (1U << 0)
+
+/**
+ * struct aie_location - AIE location information
+ * @col: column id
+ * @row: row id
+ */
+struct aie_location {
+ __u32 col;
+ __u32 row;
+};
+
+/**
+ * struct aie_range - AIE range information
+ * @start: start tile location
+ * @size: size of the range, number of columns and rows
+ */
+struct aie_range {
+ struct aie_location start;
+ struct aie_location size;
+};
+
+/**
+ * struct aie_reg_args - AIE access register arguments
+ * @op: if this request is to read, write or poll register
+ * @mask: mask for mask write, 0 for not mask write
+ * @offset: offset of register to the start of an AI engine partition
+ * @val: value to write or get
+ */
+struct aie_reg_args {
+ enum aie_reg_op op;
+ __u32 mask;
+ __u64 offset;
+ __u32 val;
+};
+
+/**
+ * struct aie_range_args - AIE range request arguments
+ * @partition_id: partition id. It is used to identify the
+ * AI engine partition in the system.
+ * @uid: image identifier loaded on the AI engine partition
+ * @range: range of AIE tiles
+ * @status: indicate if the AI engine is in use.
+ * 0 means not in used, otherwise, in use.
+ */
+struct aie_range_args {
+ __u32 partition_id;
+ __u32 uid;
+ struct aie_range range;
+ __u32 status;
+};
+
+/**
+ * struct aie_partition_query - AIE partition query arguments
+ * @partition_cnt: number of defined partitions in the system
+ * @partitions: buffer to store defined partitions information.
+ */
+struct aie_partition_query {
+ struct aie_range_args *partitions;
+ __u32 partition_cnt;
+};
+
+/**
+ * struct aie_partition_req - AIE request partition arguments
+ * @partition_id: partition node id. It is used to identify the AI engine
+ * partition in the system.
+ * @uid: image identifier loaded on the AI engine partition
+ * @meta_data: meta data to indicate which resources used by application.
+ * @flag: used for application to indicate particular driver requirements
+ * application wants to have for the partition. e.g. do not clean
+ * resource when closing the partition.
+ */
+struct aie_partition_req {
+ __u32 partition_id;
+ __u32 uid;
+ __u64 meta_data;
+ __u32 flag;
+};
+
+#define AIE_IOCTL_BASE 'A'
+
+/* AI engine device IOCTL operations */
+#define AIE_ENQUIRE_PART_IOCTL _IOWR(AIE_IOCTL_BASE, 0x1, \
+ struct aie_partition_query)
+#define AIE_REQUEST_PART_IOCTL _IOR(AIE_IOCTL_BASE, 0x2, \
+ struct aie_partition_req)
+
+/* AI engine partition IOCTL operations */
+#define AIE_REG_IOCTL _IOWR(AIE_IOCTL_BASE, 0x8, \
+ struct aie_reg_args)
+#endif
