Re: [PATCH v2 2/9] misc: Add Xilinx AI engine device driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 11/19/20 12:12 PM, Dave Airlie wrote:
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

Not really a review but don't use pointers in ioctls, don't use enums in ioctl

For ptrs use __u64 and enums use __u32
Will make the change

I think aie_partition_req also may need a __u32 pad to align to 64-bit properly.
I don't quite get this comment, partition_id and uid are __u32, there should be no hole before meta_data. and flag after meta_data is __u32, i am not clear on the usage of adding __u32 pad.

Thanks,
Wendy


Dave.

_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel




[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux