1 files changed, 122 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/intr.c b/drivers/gpu/nvgpu/os/linux/intr.c
new file mode 100644
index 00000000..7ffc7e87
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/intr.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2014-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <trace/events/gk20a.h>
+#include <linux/irqreturn.h>
+
+#include "gk20a/gk20a.h"
+#include "gk20a/mc_gk20a.h"
+
+#include <nvgpu/atomic.h>
+#include <nvgpu/unit.h>
+#include "os_linux.h"
+
+irqreturn_t nvgpu_intr_stall(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        u32 mc_intr_0;
+
+        trace_mc_gk20a_intr_stall(g->name);
+
+        if (!g->power_on)
+                return IRQ_NONE;
+
+        /* not from gpu when sharing irq with others */
+        mc_intr_0 = g->ops.mc.intr_stall(g);
+        if (unlikely(!mc_intr_0))
+                return IRQ_NONE;
+
+        g->ops.mc.intr_stall_pause(g);
+
+        atomic_inc(&l->hw_irq_stall_count);
+
+        trace_mc_gk20a_intr_stall_done(g->name);
+
+        return IRQ_WAKE_THREAD;
+}
+
+irqreturn_t nvgpu_intr_thread_stall(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        int hw_irq_count;
+
+        nvgpu_log(g, gpu_dbg_intr, "interrupt thread launched");
+
+        trace_mc_gk20a_intr_thread_stall(g->name);
+
+        hw_irq_count = atomic_read(&l->hw_irq_stall_count);
+        g->ops.mc.isr_stall(g);
+        g->ops.mc.intr_stall_resume(g);
+        /* sync handled irq counter before re-enabling interrupts */
+        atomic_set(&l->sw_irq_stall_last_handled, hw_irq_count);
+
+        nvgpu_cond_broadcast(&l->sw_irq_stall_last_handled_wq);
+
+        trace_mc_gk20a_intr_thread_stall_done(g->name);
+
+        return IRQ_HANDLED;
+}
+
+irqreturn_t nvgpu_intr_nonstall(struct gk20a *g)
+{
+        u32 non_stall_intr_val;
+        u32 hw_irq_count;
+        int ops_old, ops_new, ops = 0;
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        if (!g->power_on)
+                return IRQ_NONE;
+
+        /* not from gpu when sharing irq with others */
+        non_stall_intr_val = g->ops.mc.intr_nonstall(g);
+        if (unlikely(!non_stall_intr_val))
+                return IRQ_NONE;
+
+        g->ops.mc.intr_nonstall_pause(g);
+
+        ops = g->ops.mc.isr_nonstall(g);
+        if (ops) {
+                do {
+                        ops_old = atomic_read(&l->nonstall_ops);
+                        ops_new  = ops_old | ops;
+                } while (ops_old != atomic_cmpxchg(&l->nonstall_ops,
+                                                ops_old, ops_new));
+
+                queue_work(l->nonstall_work_queue, &l->nonstall_fn_work);
+        }
+
+        hw_irq_count = atomic_inc_return(&l->hw_irq_nonstall_count);
+
+        /* sync handled irq counter before re-enabling interrupts */
+        atomic_set(&l->sw_irq_nonstall_last_handled, hw_irq_count);
+
+        g->ops.mc.intr_nonstall_resume(g);
+
+        nvgpu_cond_broadcast(&l->sw_irq_nonstall_last_handled_wq);
+
+        return IRQ_HANDLED;
+}
+
+void nvgpu_intr_nonstall_cb(struct work_struct *work)
+{
+        struct nvgpu_os_linux *l =
+                container_of(work, struct nvgpu_os_linux, nonstall_fn_work);
+        struct gk20a *g = &l->g;
+
+        do {
+                u32 ops;
+
+                ops = atomic_xchg(&l->nonstall_ops, 0);
+                mc_gk20a_handle_intr_nonstall(g, ops);
+        } while (atomic_read(&l->nonstall_ops) != 0);
+}