[PATCH 52/83] hsa/radeon: Add process queue manager module

[Oded Gabbay <oded.gabbay@gmail.com>]

From: Ben Goz <ben.goz@amd.com>

The queue scheduler divides into two sections, one section is process bounded
and the other section is device bounded.
The process bounded section is handled by this module. The PQM handles HSA queue setup, updates and tear-down.

Signed-off-by: Ben Goz <ben.goz@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
---
 drivers/gpu/hsa/radeon/Makefile                    |   3 +-
 drivers/gpu/hsa/radeon/kfd_priv.h                  |  29 ++
 drivers/gpu/hsa/radeon/kfd_process_queue_manager.c | 370 +++++++++++++++++++++
 3 files changed, 401 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/hsa/radeon/kfd_process_queue_manager.c

diff --git a/drivers/gpu/hsa/radeon/Makefile b/drivers/gpu/hsa/radeon/Makefile
index 4978915..341fa67 100644
--- a/drivers/gpu/hsa/radeon/Makefile
+++ b/drivers/gpu/hsa/radeon/Makefile
@@ -7,6 +7,7 @@ radeon_kfd-y	:= kfd_module.o kfd_device.o kfd_chardev.o \
 		kfd_doorbell.o kfd_sched_cik_static.o kfd_registers.o \
 		kfd_vidmem.o kfd_interrupt.o kfd_aperture.o \
 		kfd_queue.o kfd_hw_pointer_store.o kfd_mqd_manager.o \
-		kfd_kernel_queue.o kfd_packet_manager.o
+		kfd_kernel_queue.o kfd_packet_manager.o \
+		kfd_process_queue_manager.o
 
 obj-$(CONFIG_HSA_RADEON)	+= radeon_kfd.o
diff --git a/drivers/gpu/hsa/radeon/kfd_priv.h b/drivers/gpu/hsa/radeon/kfd_priv.h
index b3889aa..e716745 100644
--- a/drivers/gpu/hsa/radeon/kfd_priv.h
+++ b/drivers/gpu/hsa/radeon/kfd_priv.h
@@ -311,6 +311,9 @@ struct kfd_process_device {
 	/* Scheduler process data for this device. */
 	struct kfd_scheduler_process *scheduler_process;
 
+	/* per-process-per device QCM data structure */
+	struct qcm_process_device qpd;
+
 	/* Is this process/pasid bound to this device? (amd_iommu_bind_pasid) */
 	bool bound;
 
@@ -342,6 +345,11 @@ struct kfd_process {
 	/* List of kfd_process_device structures, one for each device the process is using. */
 	struct list_head per_device_data;
 
+	struct hw_pointer_store_properties write_ptr;
+	struct hw_pointer_store_properties read_ptr;
+
+	struct process_queue_manager pqm;
+
 	/* The process's queues. */
 	size_t queue_array_size;
 	struct kfd_queue **queues;	/* Size is queue_array_size, up to MAX_PROCESS_QUEUES. */
@@ -431,6 +439,27 @@ struct mqd_manager *mqd_manager_init(enum KFD_MQD_TYPE type, struct kfd_dev *dev
 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev, enum kfd_queue_type type);
 void kernel_queue_uninit(struct kernel_queue *kq);
 
+/* Process Queue Manager */
+struct process_queue_node {
+	struct queue *q;
+	struct kernel_queue *kq;
+	struct list_head process_queue_list;
+};
+
+int pqm_init(struct process_queue_manager *pqm, struct kfd_process *p);
+void pqm_uninit(struct process_queue_manager *pqm);
+int pqm_create_queue(struct process_queue_manager *pqm,
+			    struct kfd_dev *dev,
+			    struct file *f,
+			    struct queue_properties *properties,
+			    unsigned int flags,
+			    enum kfd_queue_type type,
+			    unsigned int *qid);
+int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid);
+int pqm_update_queue(struct process_queue_manager *pqm, unsigned int qid, struct queue_properties *p);
+struct kernel_queue *pqm_get_kernel_queue(struct process_queue_manager *pqm, unsigned int qid);
+void test_diq(struct kfd_dev *dev, struct process_queue_manager *pqm);
+
 /* Packet Manager */
 
 #define KFD_HIQ_TIMEOUT (500)
diff --git a/drivers/gpu/hsa/radeon/kfd_process_queue_manager.c b/drivers/gpu/hsa/radeon/kfd_process_queue_manager.c
new file mode 100644
index 0000000..6e38ca4
--- /dev/null
+++ b/drivers/gpu/hsa/radeon/kfd_process_queue_manager.c
@@ -0,0 +1,370 @@
+/*
+ * 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.
+ *
+ * Author: Ben Goz
+ */
+
+#include <linux/slab.h>
+#include <linux/list.h>
+#include "kfd_device_queue_manager.h"
+#include "kfd_priv.h"
+#include "kfd_hw_pointer_store.h"
+#include "kfd_kernel_queue.h"
+
+static inline struct process_queue_node *get_queue_by_qid(struct process_queue_manager *pqm, unsigned int qid)
+{
+	struct process_queue_node *pqn;
+
+	BUG_ON(!pqm);
+
+	list_for_each_entry(pqn, &pqm->queues, process_queue_list) {
+		if (pqn->q && pqn->q->properties.queue_id == qid)
+			return pqn;
+		if (pqn->kq && pqn->kq->queue->properties.queue_id == qid)
+			return pqn;
+	}
+
+	return NULL;
+}
+
+static int allocate_hw_pointers(struct process_queue_manager *pqm,
+				struct queue_properties *q_properties,
+				struct file *f, struct kfd_dev *dev,
+				unsigned int qid)
+{
+	int retval;
+
+	BUG_ON(!pqm || !q_properties);
+
+	retval = 0;
+
+	pr_debug("kfd: In func %s\n", __func__);
+
+	/* allocates r/w pointers in lazy mode */
+	if (pqm->process->read_ptr.page_mapping == NULL)
+		if (hw_pointer_store_init(&pqm->process->read_ptr, KFD_HW_POINTER_STORE_TYPE_RPTR) != 0)
+			return -EBUSY;
+	if (pqm->process->write_ptr.page_mapping == NULL)
+		if (hw_pointer_store_init(&pqm->process->write_ptr, KFD_HW_POINTER_STORE_TYPE_WPTR) != 0) {
+			hw_pointer_store_destroy(&pqm->process->read_ptr);
+			return -EBUSY;
+		}
+
+	q_properties->read_ptr = hw_pointer_store_create_queue(&pqm->process->read_ptr, qid, f);
+	if (!q_properties->read_ptr)
+		return -ENOMEM;
+
+	q_properties->write_ptr = hw_pointer_store_create_queue(&pqm->process->write_ptr, qid, f);
+	if (!q_properties->write_ptr)
+		return -ENOMEM;
+
+	q_properties->doorbell_ptr = radeon_kfd_get_doorbell(f, pqm->process, dev, qid);
+	if (!q_properties->doorbell_ptr)
+		return -ENOMEM;
+
+	q_properties->doorbell_off = radeon_kfd_queue_id_to_doorbell(dev, pqm->process, qid);
+
+	return retval;
+}
+
+static int find_available_queue_slot(struct process_queue_manager *pqm, unsigned int *qid)
+{
+	unsigned long found;
+
+	BUG_ON(!pqm || !qid);
+
+	pr_debug("kfd: in %s\n", __func__);
+
+	found = find_first_zero_bit(pqm->queue_slot_bitmap, MAX_PROCESS_QUEUES);
+
+	pr_debug("kfd: the new slot id %lu\n", found);
+
+	if (found >= MAX_PROCESS_QUEUES)
+		return -ENOMEM;
+
+	set_bit(found, pqm->queue_slot_bitmap);
+	*qid = found;
+
+	return 0;
+}
+
+int pqm_init(struct process_queue_manager *pqm, struct kfd_process *p)
+{
+	BUG_ON(!pqm);
+
+	INIT_LIST_HEAD(&pqm->queues);
+	pqm->queue_slot_bitmap = kzalloc(DIV_ROUND_UP(MAX_PROCESS_QUEUES, BITS_PER_BYTE), GFP_KERNEL);
+	if (pqm->queue_slot_bitmap == NULL)
+		return -ENOMEM;
+	pqm->process = p;
+
+	return 0;
+}
+
+void pqm_uninit(struct process_queue_manager *pqm)
+{
+	int retval;
+	struct process_queue_node *pqn, *next;
+
+	BUG_ON(!pqm);
+
+	pr_debug("In func %s\n", __func__);
+
+	list_for_each_entry_safe(pqn, next, &pqm->queues, process_queue_list) {
+		retval = pqm_destroy_queue(
+				pqm,
+				(pqn->q != NULL) ?
+					pqn->q->properties.queue_id :
+					pqn->kq->queue->properties.queue_id);
+		if (retval != 0)
+			return;
+	}
+	kfree(pqm->queue_slot_bitmap);
+
+	if (pqm->process->read_ptr.page_mapping)
+		hw_pointer_store_destroy(&pqm->process->read_ptr);
+	if (pqm->process->write_ptr.page_mapping)
+		hw_pointer_store_destroy(&pqm->process->write_ptr);
+}
+
+static int create_cp_queue(struct process_queue_manager *pqm, struct kfd_dev *dev, struct queue **q,
+		struct queue_properties *q_properties, struct file *f, unsigned int qid)
+{
+	int retval;
+
+	retval = 0;
+
+	/* allocate hw pointers */
+	if (allocate_hw_pointers(pqm, q_properties, f, dev, qid) != 0) {
+		retval = -ENOMEM;
+		goto err_allocate_hw_pointers;
+	}
+
+	/* let DQM handle it*/
+	q_properties->vmid = 0;
+	q_properties->queue_id = qid;
+	q_properties->type = KFD_QUEUE_TYPE_COMPUTE;
+
+	retval = init_queue(q, *q_properties);
+	if (retval != 0)
+		goto err_init_queue;
+
+	(*q)->device = dev;
+	(*q)->process = pqm->process;
+
+	pr_debug("kfd: PQM After init queue");
+
+	return retval;
+
+err_init_queue:
+err_allocate_hw_pointers:
+	return retval;
+}
+
+int pqm_create_queue(struct process_queue_manager *pqm,
+			    struct kfd_dev *dev,
+			    struct file *f,
+			    struct queue_properties *properties,
+			    unsigned int flags,
+			    enum kfd_queue_type type,
+			    unsigned int *qid)
+{
+	int retval;
+	struct kfd_process_device *pdd;
+	struct queue_properties q_properties;
+	struct queue *q;
+	struct process_queue_node *pqn;
+	struct kernel_queue *kq;
+
+	BUG_ON(!pqm || !dev || !properties || !qid);
+
+	memset(&q_properties, 0, sizeof(struct queue_properties));
+	memcpy(&q_properties, properties, sizeof(struct queue_properties));
+
+	pdd = radeon_kfd_get_process_device_data(dev, pqm->process);
+	BUG_ON(!pdd);
+
+	retval = find_available_queue_slot(pqm, qid);
+	if (retval != 0)
+		return retval;
+
+	if (list_empty(&pqm->queues)) {
+		pdd->qpd.pqm = pqm;
+		dev->dqm->register_process(dev->dqm, &pdd->qpd);
+	}
+
+	pqn = kzalloc(sizeof(struct process_queue_node), GFP_KERNEL);
+	if (!pqn) {
+		retval = -ENOMEM;
+		goto err_allocate_pqn;
+	}
+
+	switch (type) {
+	case KFD_QUEUE_TYPE_COMPUTE:
+		retval = create_cp_queue(pqm, dev, &q, &q_properties, f, *qid);
+		if (retval != 0)
+			goto err_create_queue;
+		pqn->q = q;
+		pqn->kq = NULL;
+		retval = dev->dqm->create_queue(dev->dqm, q, &pdd->qpd, &q->properties.vmid);
+		print_queue(q);
+		break;
+	case KFD_QUEUE_TYPE_DIQ:
+		kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_DIQ);
+		if (kq == NULL) {
+			kernel_queue_uninit(kq);
+			goto err_create_queue;
+		}
+		kq->queue->properties.queue_id = *qid;
+		pqn->kq = kq;
+		pqn->q = NULL;
+		retval = dev->dqm->create_kernel_queue(dev->dqm, kq, &pdd->qpd);
+		break;
+	default:
+		BUG();
+		break;
+	}
+
+	if (retval != 0) {
+		pr_err("kfd: error dqm create queue\n");
+		goto err_create_queue;
+	}
+
+	pr_debug("kfd: PQM After DQM create queue\n");
+
+	list_add(&pqn->process_queue_list, &pqm->queues);
+
+	retval = dev->dqm->execute_queues(dev->dqm);
+	if (retval != 0) {
+		if (pqn->kq)
+			dev->dqm->destroy_kernel_queue(dev->dqm, pqn->kq, &pdd->qpd);
+		if (pqn->q)
+			dev->dqm->destroy_queue(dev->dqm, &pdd->qpd, pqn->q);
+
+		goto err_execute_runlist;
+	}
+
+	*properties = q->properties;
+	pr_debug("kfd: PQM done creating queue\n");
+	print_queue_properties(properties);
+
+	return retval;
+
+err_execute_runlist:
+	list_del(&pqn->process_queue_list);
+err_create_queue:
+	kfree(pqn);
+err_allocate_pqn:
+	clear_bit(*qid, pqm->queue_slot_bitmap);
+	return retval;
+}
+
+int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid)
+{
+	struct process_queue_node *pqn;
+	struct kfd_process_device *pdd;
+	struct device_queue_manager *dqm;
+	struct kfd_dev *dev;
+	int retval;
+
+	dqm = NULL;
+
+	BUG_ON(!pqm);
+	retval = 0;
+
+	pr_debug("kfd: In Func %s\n", __func__);
+
+	pqn = get_queue_by_qid(pqm, qid);
+	BUG_ON(!pqn);
+
+	dev = NULL;
+	if (pqn->kq)
+		dev = pqn->kq->dev;
+	if (pqn->q)
+		dev = pqn->q->device;
+	BUG_ON(!dev);
+
+	pdd = radeon_kfd_get_process_device_data(dev, pqm->process);
+	BUG_ON(!pdd);
+
+	if (pqn->kq) {
+		/* destroy kernel queue (DIQ) */
+		dqm = pqn->kq->dev->dqm;
+		dqm->destroy_kernel_queue(dqm, pqn->kq, &pdd->qpd);
+		kernel_queue_uninit(pqn->kq);
+	}
+
+	if (pqn->q) {
+		dqm = pqn->q->device->dqm;
+		retval = dqm->destroy_queue(dqm, &pdd->qpd, pqn->q);
+		if (retval != 0)
+			return retval;
+
+		list_del(&pqn->process_queue_list);
+		uninit_queue(pqn->q);
+	}
+
+	kfree(pqn);
+	clear_bit(qid, pqm->queue_slot_bitmap);
+
+	if (list_empty(&pqm->queues))
+		dqm->unregister_process(dqm, &pdd->qpd);
+
+	retval = dqm->execute_queues(dqm);
+
+	return retval;
+}
+
+int pqm_update_queue(struct process_queue_manager *pqm, unsigned int qid, struct queue_properties *p)
+{
+	struct process_queue_node *pqn;
+
+	BUG_ON(!pqm);
+
+	pqn = get_queue_by_qid(pqm, qid);
+	BUG_ON(!pqn);
+
+	pqn->q->properties.queue_address = p->queue_address;
+	pqn->q->properties.queue_size = p->queue_size;
+	pqn->q->properties.queue_percent = p->queue_percent;
+	pqn->q->properties.priority = p->priority;
+
+	pqn->q->device->dqm->destroy_queues(pqn->q->device->dqm);
+	pqn->q->device->dqm->update_queue(pqn->q->device->dqm, pqn->q);
+	pqn->q->device->dqm->execute_queues(pqn->q->device->dqm);
+
+	return 0;
+}
+
+struct kernel_queue *pqm_get_kernel_queue(struct process_queue_manager *pqm, unsigned int qid)
+{
+	struct process_queue_node *pqn;
+
+	BUG_ON(!pqm);
+
+	pqn = get_queue_by_qid(pqm, qid);
+	if (pqn && pqn->kq)
+		return pqn->kq;
+
+	return NULL;
+}
+
+
-- 
1.9.1