drm/amdkfd: Add the events module

This patch adds the events module (kfd_events.c) and the interrupt
handle module for Kaveri (cik_event_interrupt.c).

The patch updates the interrupt_is_wanted(), so that it now calls the
interrupt isr function specific for the device that received the
interrupt. That function(implemented in cik_event_interrupt.c)
returns whether this interrupt is of interest to us or not.

The patch also updates the interrupt_wq(), so that it now calls the
device's specific wq function, which checks the interrupt source
and tries to signal relevant events.

v2:

Increase limit of signal events to 4096 per process
Remove bitfields from struct cik_ih_ring_entry
Rename radeon_kfd_event_mmap to kfd_event_mmap
Add debug prints to allocate_free_slot and allocate_signal_page
Make allocate_event_notification_slot return a correct value
Add warning prints to create_signal_event
Remove error print from IOCTL path
Reformatted debug prints in kfd_event_mmap
Map correct size (as received from mmap) in kfd_event_mmap

v3:

Reduce limit of signal events back to 256 per process
Fix allocation of kernel memory for signal events
Signed-off-by: Andrew Lewycky <Andrew.Lewycky@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/gpu/drm/amd/amdkfd/Makefile

@@ -12,6 +12,6 @@ amdkfd-y	:= kfd_module.o kfd_device.o kfd_chardev.o kfd_topology.o \
 		kfd_kernel_queue_vi.o kfd_packet_manager.o \
 		kfd_process_queue_manager.o kfd_device_queue_manager.o \
 		kfd_device_queue_manager_cik.o kfd_device_queue_manager_vi.o \
-		kfd_interrupt.o
+		kfd_interrupt.o kfd_events.o cik_event_interrupt.o
 
 obj-$(CONFIG_HSA_AMD)	+= amdkfd.o

drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c

+/*
+ * 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 "kfd_priv.h"
+#include "kfd_events.h"
+#include "cik_int.h"
+
+static bool cik_event_interrupt_isr(struct kfd_dev *dev,
+					const uint32_t *ih_ring_entry)
+{
+	unsigned int pasid;
+	const struct cik_ih_ring_entry *ihre =
+			(const struct cik_ih_ring_entry *)ih_ring_entry;
+
+	pasid = (ihre->ring_id & 0xffff0000) >> 16;
+
+	/* Do not process in ISR, just request it to be forwarded to WQ. */
+	return (pasid != 0) &&
+		(ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE ||
+		ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG);
+}
+
+static void cik_event_interrupt_wq(struct kfd_dev *dev,
+					const uint32_t *ih_ring_entry)
+{
+	unsigned int pasid;
+	const struct cik_ih_ring_entry *ihre =
+			(const struct cik_ih_ring_entry *)ih_ring_entry;
+
+	pasid = (ihre->ring_id & 0xffff0000) >> 16;
+
+	if (pasid == 0)
+		return;
+
+	if (ihre->source_id == CIK_INTSRC_CP_END_OF_PIPE)
+		kfd_signal_event_interrupt(pasid, 0, 0);
+	else if (ihre->source_id == CIK_INTSRC_SQ_INTERRUPT_MSG)
+		kfd_signal_event_interrupt(pasid, ihre->data & 0xFF, 8);
+}
+
+const struct kfd_event_interrupt_class event_interrupt_class_cik = {
+	.interrupt_isr = cik_event_interrupt_isr,
+	.interrupt_wq = cik_event_interrupt_wq,
+};

drivers/gpu/drm/amd/amdkfd/cik_int.h

+/*
+ * 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 HSA_RADEON_CIK_INT_H_INCLUDED
+#define HSA_RADEON_CIK_INT_H_INCLUDED
+
+#include <linux/types.h>
+
+struct cik_ih_ring_entry {
+	uint32_t source_id;
+	uint32_t data;
+	uint32_t ring_id;
+	uint32_t reserved;
+};
+
+#define CIK_INTSRC_DEQUEUE_COMPLETE	0xC6
+#define CIK_INTSRC_CP_END_OF_PIPE	0xB5
+#define CIK_INTSRC_SQ_INTERRUPT_MSG	0xEF
+
+#endif
+

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -289,8 +289,10 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 
 	args->queue_id = queue_id;
 
+
 	/* Return gpu_id as doorbell offset for mmap usage */
-	args->doorbell_offset = args->gpu_id << PAGE_SHIFT;
+	args->doorbell_offset = (KFD_MMAP_DOORBELL_MASK | args->gpu_id);
+	args->doorbell_offset <<= PAGE_SHIFT;
 
 	mutex_unlock(&p->mutex);
 
@@ -684,5 +686,15 @@ static int kfd_mmap(struct file *filp, struct vm_area_struct *vma)
 	if (IS_ERR(process))
 		return PTR_ERR(process);
 
+	if ((vma->vm_pgoff & KFD_MMAP_DOORBELL_MASK) ==
+			KFD_MMAP_DOORBELL_MASK) {
+		vma->vm_pgoff = vma->vm_pgoff ^ KFD_MMAP_DOORBELL_MASK;
 		return kfd_doorbell_mmap(process, vma);
+	} else if ((vma->vm_pgoff & KFD_MMAP_EVENTS_MASK) ==
+			KFD_MMAP_EVENTS_MASK) {
+		vma->vm_pgoff = vma->vm_pgoff ^ KFD_MMAP_EVENTS_MASK;
+		return kfd_event_mmap(process, vma);
+	}
+
+	return -EFAULT;
 }

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -34,6 +34,7 @@ static const struct kfd_device_info kaveri_device_info = {
 	.asic_family = CHIP_KAVERI,
 	.max_pasid_bits = 16,
 	.ih_ring_entry_size = 4 * sizeof(uint32_t),
+	.event_interrupt_class = &event_interrupt_class_cik,
 	.mqd_size_aligned = MQD_SIZE_ALIGNED
 };
 

drivers/gpu/drm/amd/amdkfd/kfd_events.h

+/*
+ * 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_EVENTS_H_INCLUDED
+#define KFD_EVENTS_H_INCLUDED
+
+#include <linux/kernel.h>
+#include <linux/hashtable.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include "kfd_priv.h"
+
+#define KFD_EVENT_ID_NONSIGNAL_MASK 0x80000000U
+#define KFD_FIRST_NONSIGNAL_EVENT_ID KFD_EVENT_ID_NONSIGNAL_MASK
+#define KFD_LAST_NONSIGNAL_EVENT_ID UINT_MAX
+
+/*
+ * Written into kfd_signal_slot_t to indicate that the event is not signaled.
+ * Since the event protocol may need to write the event ID into memory, this
+ * must not be a valid event ID.
+ * For the sake of easy memset-ing, this must be a byte pattern.
+ */
+#define UNSIGNALED_EVENT_SLOT ((uint64_t)-1)
+
+struct kfd_event_waiter;
+struct signal_page;
+
+struct kfd_event {
+	/* All events in process, rooted at kfd_process.events. */
+	struct hlist_node events;
+
+	u32 event_id;
+
+	bool signaled;
+	bool auto_reset;
+
+	int type;
+
+	struct list_head waiters; /* List of kfd_event_waiter by waiters. */
+
+	/* Only for signal events. */
+	struct signal_page *signal_page;
+	unsigned int signal_slot_index;
+	uint64_t __user *user_signal_address;
+};
+
+#define KFD_EVENT_TIMEOUT_IMMEDIATE 0
+#define KFD_EVENT_TIMEOUT_INFINITE 0xFFFFFFFFu
+
+/* Matching HSA_EVENTTYPE */
+#define KFD_EVENT_TYPE_SIGNAL 0
+#define KFD_EVENT_TYPE_DEBUG 5
+
+extern void kfd_signal_event_interrupt(unsigned int pasid, uint32_t partial_id,
+					uint32_t valid_id_bits);
+
+#endif

drivers/gpu/drm/amd/amdkfd/kfd_interrupt.c

@@ -172,10 +172,17 @@ static void interrupt_wq(struct work_struct *work)
 				sizeof(uint32_t))];
 
 	while (dequeue_ih_ring_entry(dev, ih_ring_entry))
-		;
+		dev->device_info->event_interrupt_class->interrupt_wq(dev,
+								ih_ring_entry);
 }
 
 bool interrupt_is_wanted(struct kfd_dev *dev, const uint32_t *ih_ring_entry)
 {
-	return false;
+	/* integer and bitwise OR so there is no boolean short-circuiting */
+	unsigned wanted = 0;
+
+	wanted |= dev->device_info->event_interrupt_class->interrupt_isr(dev,
+								ih_ring_entry);
+
+	return wanted != 0;
 }

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

@@ -35,6 +35,9 @@
 
 #define KFD_SYSFS_FILE_MODE 0444
 
+#define KFD_MMAP_DOORBELL_MASK 0x8000000000000
+#define KFD_MMAP_EVENTS_MASK 0x4000000000000
+
 /*
  * When working with cp scheduler we should assign the HIQ manually or via
  * the radeon driver to a fixed hqd slot, here are the fixed HIQ hqd slot
@@ -108,8 +111,16 @@ enum asic_family_type {
 	CHIP_CARRIZO
 };
 
+struct kfd_event_interrupt_class {
+	bool (*interrupt_isr)(struct kfd_dev *dev,
+				const uint32_t *ih_ring_entry);
+	void (*interrupt_wq)(struct kfd_dev *dev,
+				const uint32_t *ih_ring_entry);
+};
+
 struct kfd_device_info {
 	unsigned int asic_family;
+	const struct kfd_event_interrupt_class *event_interrupt_class;
 	unsigned int max_pasid_bits;
 	size_t ih_ring_entry_size;
 	uint8_t num_of_watch_points;
@@ -490,6 +501,15 @@ struct kfd_process {
 
 	/*Is the user space process 32 bit?*/
 	bool is_32bit_user_mode;
+
+	/* Event-related data */
+	struct mutex event_mutex;
+	/* All events in process hashed by ID, linked on kfd_event.events. */
+	DECLARE_HASHTABLE(events, 4);
+	struct list_head signal_event_pages;	/* struct slot_page_header.
+								event_pages */
+	u32 next_nonsignal_event_id;
+	size_t signal_event_count;
 };
 
 /**
@@ -514,6 +534,7 @@ void kfd_process_create_wq(void);
 void kfd_process_destroy_wq(void);
 struct kfd_process *kfd_create_process(const struct task_struct *);
 struct kfd_process *kfd_get_process(const struct task_struct *);
+struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid);
 
 struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
 							struct kfd_process *p);
@@ -659,4 +680,30 @@ uint64_t kfd_get_number_elems(struct kfd_dev *kfd);
 phys_addr_t kfd_get_process_doorbells(struct kfd_dev *dev,
 					struct kfd_process *process);
 
+/* Events */
+extern const struct kfd_event_interrupt_class event_interrupt_class_cik;
+
+enum kfd_event_wait_result {
+	KFD_WAIT_COMPLETE,
+	KFD_WAIT_TIMEOUT,
+	KFD_WAIT_ERROR
+};
+
+void kfd_event_init_process(struct kfd_process *p);
+void kfd_event_free_process(struct kfd_process *p);
+int kfd_event_mmap(struct kfd_process *process, struct vm_area_struct *vma);
+int kfd_wait_on_events(struct kfd_process *p,
+		       uint32_t num_events, const uint32_t __user *event_ids,
+		       bool all, uint32_t user_timeout_ms,
+		       enum kfd_event_wait_result *wait_result);
+void kfd_signal_event_interrupt(unsigned int pasid, uint32_t partial_id,
+				uint32_t valid_id_bits);
+int kfd_set_event(struct kfd_process *p, uint32_t event_id);
+int kfd_reset_event(struct kfd_process *p, uint32_t event_id);
+int kfd_event_create(struct file *devkfd, struct kfd_process *p,
+		     uint32_t event_type, bool auto_reset, uint32_t node_id,
+		     uint32_t *event_id, uint32_t *event_trigger_data,
+		     uint64_t *event_page_offset, uint32_t *event_slot_index);
+int kfd_event_destroy(struct kfd_process *p, uint32_t event_id);
+
 #endif

drivers/gpu/drm/amd/amdkfd/kfd_process.c

@@ -178,6 +178,8 @@ static void kfd_process_wq_release(struct work_struct *work)
 		kfree(pdd);
 	}
 
+	kfd_event_free_process(p);
+
 	kfd_pasid_free(p->pasid);
 
 	mutex_unlock(&p->mutex);
@@ -288,6 +290,8 @@ static struct kfd_process *create_process(const struct task_struct *thread)
 
 	INIT_LIST_HEAD(&process->per_device_data);
 
+	kfd_event_init_process(process);
+
 	err = pqm_init(&process->pqm, process);
 	if (err != 0)
 		goto err_process_pqm_init;
@@ -430,3 +434,23 @@ bool kfd_has_process_device_data(struct kfd_process *p)
 {
 	return !(list_empty(&p->per_device_data));
 }
+
+/* This returns with process->mutex locked. */
+struct kfd_process *kfd_lookup_process_by_pasid(unsigned int pasid)
+{
+	struct kfd_process *p;
+	unsigned int temp;
+
+	int idx = srcu_read_lock(&kfd_processes_srcu);
+
+	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+		if (p->pasid == pasid) {
+			mutex_lock(&p->mutex);
+			break;
+		}
+	}
+
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+
+	return p;
+}