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>

1 files changed, 63 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
new file mode 100644
index 0000000..629510a
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/cik_event_interrupt.c
@@ -0,0 +1,63 @@
+/*
+ * 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,
+};