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Date:	Sun, 20 Jul 2014 19:06:05 -0400
From:	Jerome Glisse <j.glisse@...il.com>
To:	Oded Gabbay <oded.gabbay@....com>
Cc:	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexdeucher@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Bridgman <John.Bridgman@....com>,
	Joerg Roedel <joro@...tes.org>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Christian König <deathsimple@...afone.de>,
	Michel Dänzer <michel.daenzer@....com>,
	Ben Goz <Ben.Goz@....com>,
	Alexey Skidanov <Alexey.Skidanov@....com>,
	Evgeny Pinchuk <Evgeny.Pinchuk@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 13/25] amdkfd: Add queue module

On Thu, Jul 17, 2014 at 04:29:20PM +0300, Oded Gabbay wrote:
> From: Ben Goz <ben.goz@....com>
> 
> The queue module enables allocating and initializing queues uniformly.
> 
> Signed-off-by: Ben Goz <ben.goz@....com>
> Signed-off-by: Oded Gabbay <oded.gabbay@....com>
> ---
>  drivers/gpu/drm/radeon/amdkfd/Makefile    |   2 +-
>  drivers/gpu/drm/radeon/amdkfd/kfd_priv.h  |  48 +++++++++++++
>  drivers/gpu/drm/radeon/amdkfd/kfd_queue.c | 109 ++++++++++++++++++++++++++++++
>  3 files changed, 158 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/radeon/amdkfd/kfd_queue.c
> 
> diff --git a/drivers/gpu/drm/radeon/amdkfd/Makefile b/drivers/gpu/drm/radeon/amdkfd/Makefile
> index daf75a8..dbff147 100644
> --- a/drivers/gpu/drm/radeon/amdkfd/Makefile
> +++ b/drivers/gpu/drm/radeon/amdkfd/Makefile
> @@ -6,6 +6,6 @@ ccflags-y := -Iinclude/drm
>  
>  amdkfd-y	:= kfd_module.o kfd_device.o kfd_chardev.o kfd_topology.o \
>  		kfd_pasid.o kfd_doorbell.o kfd_vidmem.o kfd_aperture.o \
> -		kfd_process.o
> +		kfd_process.o kfd_queue.o
>  
>  obj-$(CONFIG_HSA_RADEON)	+= amdkfd.o
> diff --git a/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h b/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h
> index 604c317..94ff1c3 100644
> --- a/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h
> +++ b/drivers/gpu/drm/radeon/amdkfd/kfd_priv.h
> @@ -65,6 +65,9 @@ typedef unsigned int pasid_t;
>  /* Type that represents a HW doorbell slot. */
>  typedef u32 doorbell_t;
>  
> +/* Type that represents queue pointer */
> +typedef u32 qptr_t;
> +
>  struct kfd_device_info {
>  	const struct kfd_scheduler_class *scheduler_class;
>  	unsigned int max_pasid_bits;
> @@ -125,12 +128,57 @@ void kfd_vidmem_unkmap(struct kfd_dev *kfd, kfd_mem_obj mem_obj);
>  int kfd_vidmem_alloc_map(struct kfd_dev *kfd, kfd_mem_obj *mem_obj, void **ptr,
>  			uint64_t *vmid0_address, size_t size);
>  void kfd_vidmem_free_unmap(struct kfd_dev *kfd, kfd_mem_obj mem_obj);
> +
>  /* Character device interface */
>  int kfd_chardev_init(void);
>  void kfd_chardev_exit(void);
>  struct device *kfd_chardev(void);
>  
>  
> +enum kfd_queue_type  {
> +	KFD_QUEUE_TYPE_COMPUTE,
> +	KFD_QUEUE_TYPE_SDMA,
> +	KFD_QUEUE_TYPE_HIQ,
> +	KFD_QUEUE_TYPE_DIQ
> +};
> +
> +struct queue_properties {
> +	enum kfd_queue_type type;
> +	unsigned int queue_id;
> +	uint64_t queue_address;
> +	uint64_t  queue_size;
> +	uint32_t priority;
> +	uint32_t queue_percent;
> +	qptr_t *read_ptr;
> +	qptr_t *write_ptr;
> +	qptr_t *doorbell_ptr;
> +	qptr_t doorbell_off;
> +	bool is_interop;
> +	bool is_active;
> +	/* Not relevant for user mode queues in cp scheduling */
> +	unsigned int vmid;
> +};
> +
> +struct queue {
> +	struct list_head list;
> +	void *mqd;
> +	/* kfd_mem_obj contains the mqd */
> +	kfd_mem_obj mqd_mem_obj;
> +	uint64_t gart_mqd_addr; /* needed for cp scheduling */
> +	struct queue_properties properties;
> +
> +	/*
> +	 * Used by the queue device manager to track the hqd slot per queue
> +	 * when using no cp scheduling
> +	 */
> +	uint32_t mec;
> +	uint32_t pipe;
> +	uint32_t queue;
> +
> +	struct kfd_process	*process;
> +	struct kfd_dev		*device;
> +};
> +
>  /* Data that is per-process-per device. */
>  struct kfd_process_device {
>  	/*
> diff --git a/drivers/gpu/drm/radeon/amdkfd/kfd_queue.c b/drivers/gpu/drm/radeon/amdkfd/kfd_queue.c
> new file mode 100644
> index 0000000..646b6d1
> --- /dev/null
> +++ b/drivers/gpu/drm/radeon/amdkfd/kfd_queue.c
> @@ -0,0 +1,109 @@
> +/*
> + * 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.
> + *
> + */
> +
> +#include <linux/slab.h>
> +#include "kfd_priv.h"
> +
> +void print_queue_properties(struct queue_properties *q)
> +{
> +	if (!q)
> +		return;
> +
> +	pr_debug("Printing queue properties\n"
> +			"Queue Type: %u\n"
> +			"Queue Size: %llu\n"
> +			"Queue percent: %u\n"
> +			"Queue Address: 0x%llX\n"
> +			"Queue Id: %u\n"
> +			"Queue Process Vmid: %u\n"
> +			"Queue Read Pointer: 0x%p\n"
> +			"Queue Write Pointer: 0x%p\n"
> +			"Queue Doorbell Pointer: 0x%p\n"
> +			"Queue Doorbell Offset: %u\n",  q->type,
> +							q->queue_size,
> +							q->queue_percent,
> +							q->queue_address,
> +							q->queue_id,
> +							q->vmid,
> +							q->read_ptr,
> +							q->write_ptr,
> +							q->doorbell_ptr,
> +							q->doorbell_off);

One pr_debug call per line.

> +}
> +
> +void print_queue(struct queue *q)
> +{
> +	if (!q)
> +		return;
> +	pr_debug("Printing queue\n"
> +			"Queue Type: %u\n"
> +			"Queue Size: %llu\n"
> +			"Queue percent: %u\n"
> +			"Queue Address: 0x%llX\n"
> +			"Queue Id: %u\n"
> +			"Queue Process Vmid: %u\n"
> +			"Queue Read Pointer: 0x%p\n"
> +			"Queue Write Pointer: 0x%p\n"
> +			"Queue Doorbell Pointer: 0x%p\n"
> +			"Queue Doorbell Offset: %u\n"
> +			"Queue MQD Address: 0x%p\n"
> +			"Queue MQD Gart: 0x%llX\n"
> +			"Queue Process Address: 0x%p\n"
> +			"Queue Device Address: 0x%p\n",
> +					q->properties.type,
> +					q->properties.queue_size,
> +					q->properties.queue_percent,
> +					q->properties.queue_address,
> +					q->properties.queue_id,
> +					q->properties.vmid,
> +					q->properties.read_ptr,
> +					q->properties.write_ptr,
> +					q->properties.doorbell_ptr,
> +					q->properties.doorbell_off,
> +					q->mqd,
> +					q->gart_mqd_addr,
> +					q->process,
> +					q->device);

Ditto

> +}
> +
> +int init_queue(struct queue **q, struct queue_properties properties)
> +{
> +	struct queue *tmp;
> +
> +	BUG_ON(!q);
> +
> +	tmp = kzalloc(sizeof(struct queue), GFP_KERNEL);
> +	if (!tmp)
> +		return -ENOMEM;
> +
> +	memset(&tmp->properties, 0, sizeof(struct queue_properties));

memset uselss because of the memcpy below.

> +	memcpy(&tmp->properties, &properties, sizeof(struct queue_properties));
> +
> +	*q = tmp;
> +	return 0;
> +}
> +
> +void uninit_queue(struct queue *q)
> +{
> +	kfree(q);
> +}
> -- 
> 1.9.1
> 
--
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