[PATCH 13/83] hsa/radeon: Add 2 new IOCTL to kfd, CREATE_QUEUE and DESTROY_QUEUE
From: Oded Gabbay <hidden>
Date: 2014-07-10 21:51:39
This patch adds 2 new IOCTL to kfd driver. The first IOCTL is KFD_IOC_CREATE_QUEUE that is used by the user-mode application to create a compute queue on the GPU. The second IOCTL is KFD_IOC_DESTROY_QUEUE that is used by the user-mode application to destroy an existing compute queue on the GPU. Signed-off-by: Oded Gabbay <redacted> --- drivers/gpu/hsa/radeon/kfd_chardev.c | 155 ++++++++++++++++++++++++++++++++++ drivers/gpu/hsa/radeon/kfd_doorbell.c | 11 +++ include/uapi/linux/kfd_ioctl.h | 69 +++++++++++++++ 3 files changed, 235 insertions(+) create mode 100644 include/uapi/linux/kfd_ioctl.h
diff --git a/drivers/gpu/hsa/radeon/kfd_chardev.c b/drivers/gpu/hsa/radeon/kfd_chardev.c
index 0b5bc74..4e7d5d0 100644
--- a/drivers/gpu/hsa/radeon/kfd_chardev.c
+++ b/drivers/gpu/hsa/radeon/kfd_chardev.c@@ -27,11 +27,13 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <uapi/linux/kfd_ioctl.h> #include "kfd_priv.h" #include "kfd_scheduler.h" static long kfd_ioctl(struct file *, unsigned int, unsigned long); static int kfd_open(struct inode *, struct file *); +static int kfd_mmap(struct file *, struct vm_area_struct *); static const char kfd_dev_name[] = "kfd";
@@ -108,17 +110,170 @@ kfd_open(struct inode *inode, struct file *filep) return 0; } +static long +kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p, void __user *arg) +{ + struct kfd_ioctl_create_queue_args args; + struct kfd_dev *dev; + int err = 0; + unsigned int queue_id; + struct kfd_queue *queue; + struct kfd_process_device *pdd; + + if (copy_from_user(&args, arg, sizeof(args))) + return -EFAULT; + + dev = radeon_kfd_device_by_id(args.gpu_id); + if (dev == NULL) + return -EINVAL; + + queue = kzalloc( + offsetof(struct kfd_queue, scheduler_queue) + dev->device_info->scheduler_class->queue_size, + GFP_KERNEL); + + if (!queue) + return -ENOMEM; + + queue->dev = dev; + + mutex_lock(&p->mutex); + + pdd = radeon_kfd_bind_process_to_device(dev, p); + if (IS_ERR(pdd) < 0) { + err = PTR_ERR(pdd); + goto err_bind_pasid; + } + + pr_debug("kfd: creating queue number %d for PASID %d on GPU 0x%x\n", + pdd->queue_count, + p->pasid, + dev->id); + + if (pdd->queue_count++ == 0) { + err = dev->device_info->scheduler_class->register_process(dev->scheduler, p, &pdd->scheduler_process); + if (err < 0) + goto err_register_process; + } + + if (!radeon_kfd_allocate_queue_id(p, &queue_id)) + goto err_allocate_queue_id; + + err = dev->device_info->scheduler_class->create_queue(dev->scheduler, pdd->scheduler_process, + &queue->scheduler_queue, + (void __user *)args.ring_base_address, + args.ring_size, + (void __user *)args.read_pointer_address, + (void __user *)args.write_pointer_address, + radeon_kfd_queue_id_to_doorbell(dev, p, queue_id)); + if (err) + goto err_create_queue; + + radeon_kfd_install_queue(p, queue_id, queue); + + args.queue_id = queue_id; + args.doorbell_address = (uint64_t)(uintptr_t)radeon_kfd_get_doorbell(filep, p, dev, queue_id); + + if (copy_to_user(arg, &args, sizeof(args))) { + err = -EFAULT; + goto err_copy_args_out; + } + + mutex_unlock(&p->mutex); + + pr_debug("kfd: queue id %d was created successfully.\n" + " ring buffer address == 0x%016llX\n" + " read ptr address == 0x%016llX\n" + " write ptr address == 0x%016llX\n" + " doorbell address == 0x%016llX\n", + args.queue_id, + args.ring_base_address, + args.read_pointer_address, + args.write_pointer_address, + args.doorbell_address); + + return 0; + +err_copy_args_out: + dev->device_info->scheduler_class->destroy_queue(dev->scheduler, &queue->scheduler_queue); +err_create_queue: + radeon_kfd_remove_queue(p, queue_id); +err_allocate_queue_id: + if (--pdd->queue_count == 0) { + dev->device_info->scheduler_class->deregister_process(dev->scheduler, pdd->scheduler_process); + pdd->scheduler_process = NULL; + } +err_register_process: +err_bind_pasid: + kfree(queue); + mutex_unlock(&p->mutex); + return err; +} + +static int +kfd_ioctl_destroy_queue(struct file *filp, struct kfd_process *p, void __user *arg) +{ + struct kfd_ioctl_destroy_queue_args args; + struct kfd_queue *queue; + struct kfd_dev *dev; + struct kfd_process_device *pdd; + + if (copy_from_user(&args, arg, sizeof(args))) + return -EFAULT; + + mutex_lock(&p->mutex); + + queue = radeon_kfd_get_queue(p, args.queue_id); + if (!queue) { + mutex_unlock(&p->mutex); + return -EINVAL; + } + + dev = queue->dev; + + pr_debug("kfd: destroying queue id %d for PASID %d\n", + args.queue_id, + p->pasid); + + radeon_kfd_remove_queue(p, args.queue_id); + dev->device_info->scheduler_class->destroy_queue(dev->scheduler, &queue->scheduler_queue); + + kfree(queue); + + pdd = radeon_kfd_get_process_device_data(dev, p); + BUG_ON(pdd == NULL); /* Because a queue exists. */ + + if (--pdd->queue_count == 0) { + dev->device_info->scheduler_class->deregister_process(dev->scheduler, pdd->scheduler_process); + pdd->scheduler_process = NULL; + } + + mutex_unlock(&p->mutex); + return 0; +} static long kfd_ioctl(struct file *filep, unsigned int cmd, unsigned long arg) { + struct kfd_process *process; long err = -EINVAL; dev_info(kfd_device, "ioctl cmd 0x%x (#%d), arg 0x%lx\n", cmd, _IOC_NR(cmd), arg); + process = radeon_kfd_get_process(current); + if (IS_ERR(process)) + return PTR_ERR(process); + switch (cmd) { + case KFD_IOC_CREATE_QUEUE: + err = kfd_ioctl_create_queue(filep, process, (void __user *)arg); + break; + + case KFD_IOC_DESTROY_QUEUE: + err = kfd_ioctl_destroy_queue(filep, process, (void __user *)arg); + break; + default: dev_err(kfd_device, "unknown ioctl cmd 0x%x, arg 0x%lx)\n",
diff --git a/drivers/gpu/hsa/radeon/kfd_doorbell.c b/drivers/gpu/hsa/radeon/kfd_doorbell.c
index e1d8506..3de8a02 100644
--- a/drivers/gpu/hsa/radeon/kfd_doorbell.c
+++ b/drivers/gpu/hsa/radeon/kfd_doorbell.c@@ -155,3 +155,14 @@ doorbell_t __user *radeon_kfd_get_doorbell(struct file *devkfd, struct kfd_proce return &pdd->doorbell_mapping[doorbell_index]; } +/* + * queue_ids are in the range [0,MAX_PROCESS_QUEUES) and are mapped 1:1 + * to doorbells with the process's doorbell page + */ +unsigned int radeon_kfd_queue_id_to_doorbell(struct kfd_dev *kfd, struct kfd_process *process, unsigned int queue_id) +{ + /* doorbell_id_offset accounts for doorbells taken by KGD. + * pasid * doorbell_process_allocation/sizeof(doorbell_t) adjusts to the process's doorbells */ + return kfd->doorbell_id_offset + process->pasid * (doorbell_process_allocation()/sizeof(doorbell_t)) + queue_id; +} +
diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
new file mode 100644
index 0000000..dcc5fe0
--- /dev/null
+++ b/include/uapi/linux/kfd_ioctl.h@@ -0,0 +1,69 @@ +/* + * Copyright 2014 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + +#ifndef KFD_IOCTL_H_INCLUDED +#define KFD_IOCTL_H_INCLUDED + +#include <linux/types.h> +#include <linux/ioctl.h> + +#define KFD_IOCTL_CURRENT_VERSION 1 + +/* The 64-bit ABI is the authoritative version. */ +#pragma pack(push, 8) + +struct kfd_ioctl_get_version_args { + uint32_t min_supported_version; /* from KFD */ + uint32_t max_supported_version; /* from KFD */ +}; + +/* For kfd_ioctl_create_queue_args.queue_type. */ +#define KFD_IOC_QUEUE_TYPE_COMPUTE 0 +#define KFD_IOC_QUEUE_TYPE_SDMA 1 + +struct kfd_ioctl_create_queue_args { + uint64_t ring_base_address; /* to KFD */ + uint32_t ring_size; /* to KFD */ + uint32_t gpu_id; /* to KFD */ + uint32_t queue_type; /* to KFD */ + uint32_t queue_percentage; /* to KFD */ + uint32_t queue_priority; /* to KFD */ + uint64_t write_pointer_address; /* to KFD */ + uint64_t read_pointer_address; /* to KFD */ + + uint64_t doorbell_address; /* from KFD */ + uint32_t queue_id; /* from KFD */ +}; + +struct kfd_ioctl_destroy_queue_args { + uint32_t queue_id; /* to KFD */ +}; + +#define KFD_IOC_MAGIC 'K' + +#define KFD_IOC_GET_VERSION _IOR(KFD_IOC_MAGIC, 1, struct kfd_ioctl_get_version_args) +#define KFD_IOC_CREATE_QUEUE _IOWR(KFD_IOC_MAGIC, 2, struct kfd_ioctl_create_queue_args) +#define KFD_IOC_DESTROY_QUEUE _IOWR(KFD_IOC_MAGIC, 3, struct kfd_ioctl_destroy_queue_args) + +#pragma pack(pop) + +#endif
--
1.9.1