gpu: nvgpu: vgpu: handle fifo and gr exceptions

Handle the gr and fifo exceptions delivered from the server
and update the channel state as needed.

Bug 1551865

Change-Id: Ie19626c6e8a72f92ffd134983fe6d84e5c6c8736
Signed-off-by: Aingara Paramakuru <aparamakuru@nvidia.com>
Reviewed-on: http://git-master/r/670329
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

drivers/gpu/nvgpu/vgpu/fifo_vgpu.c

@@ -1,7 +1,7 @@
 /*
  * Virtualized GPU Fifo
  *
- * Copyright (c) 2014 NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2015, 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,
@@ -551,6 +551,57 @@ static int vgpu_fifo_wait_engine_idle(struct gk20a *g)
 	return 0;
 }
 
+static void vgpu_fifo_set_ctx_mmu_error(struct gk20a *g,
+		struct channel_gk20a *ch)
+{
+	if (ch->error_notifier) {
+		if (ch->error_notifier->status == 0xffff) {
+			/* If error code is already set, this mmu fault
+			 * was triggered as part of recovery from other
+			 * error condition.
+			 * Don't overwrite error flag. */
+		} else {
+			gk20a_set_error_notifier(ch,
+				NVGPU_CHANNEL_FIFO_ERROR_MMU_ERR_FLT);
+		}
+	}
+	/* mark channel as faulted */
+	ch->has_timedout = true;
+	wmb();
+	/* unblock pending waits */
+	wake_up(&ch->semaphore_wq);
+	wake_up(&ch->notifier_wq);
+	wake_up(&ch->submit_wq);
+}
+
+int vgpu_fifo_isr(struct gk20a *g, struct tegra_vgpu_fifo_intr_info *info)
+{
+	struct fifo_gk20a *f = &g->fifo;
+	struct channel_gk20a *ch = &f->channel[info->chid];
+
+	gk20a_err(dev_from_gk20a(g), "fifo intr (%d) on ch %u",
+		info->type, info->chid);
+
+	switch (info->type) {
+	case TEGRA_VGPU_FIFO_INTR_PBDMA:
+		gk20a_set_error_notifier(ch, NVGPU_CHANNEL_PBDMA_ERROR);
+		break;
+	case TEGRA_VGPU_FIFO_INTR_CTXSW_TIMEOUT:
+		gk20a_set_error_notifier(ch,
+					NVGPU_CHANNEL_FIFO_ERROR_IDLE_TIMEOUT);
+		break;
+	case TEGRA_VGPU_FIFO_INTR_MMU_FAULT:
+		gk20a_channel_abort(ch);
+		vgpu_fifo_set_ctx_mmu_error(g, ch);
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
+
+	return 0;
+}
+
 void vgpu_init_fifo_ops(struct gpu_ops *gops)
 {
 	gops->fifo.bind_channel = vgpu_channel_bind;

drivers/gpu/nvgpu/vgpu/gr_vgpu.c

@@ -1,7 +1,7 @@
 /*
  * Virtualized GPU Graphics
  *
- * Copyright (c) 2014 NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2015, 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,
@@ -668,38 +668,51 @@ int vgpu_init_gr_support(struct gk20a *g)
 	return vgpu_gr_init_gr_setup_sw(g);
 }
 
-struct gr_isr_data {
-	u32 addr;
-	u32 data_lo;
-	u32 data_hi;
-	u32 curr_ctx;
-	u32 chid;
-	u32 offset;
-	u32 sub_chan;
-	u32 class_num;
-};
-
-static int vgpu_gr_handle_notify_pending(struct gk20a *g,
-					struct gr_isr_data *isr_data)
-{
-	struct fifo_gk20a *f = &g->fifo;
-	struct channel_gk20a *ch = &f->channel[isr_data->chid];
-
-	gk20a_dbg_fn("");
-	wake_up(&ch->notifier_wq);
-	return 0;
-}
-
 int vgpu_gr_isr(struct gk20a *g, struct tegra_vgpu_gr_intr_info *info)
 {
-	struct gr_isr_data isr_data;
+	struct fifo_gk20a *f = &g->fifo;
+	struct channel_gk20a *ch = &f->channel[info->chid];
 
 	gk20a_dbg_fn("");
+	if (info->type != TEGRA_VGPU_GR_INTR_NOTIFY)
+		gk20a_err(dev_from_gk20a(g), "gr intr (%d) on ch %u",
+			info->type, info->chid);
 
-	isr_data.chid = info->chid;
-
-	if (info->type == TEGRA_VGPU_GR_INTR_NOTIFY)
-		vgpu_gr_handle_notify_pending(g, &isr_data);
+	switch (info->type) {
+	case TEGRA_VGPU_GR_INTR_NOTIFY:
+		wake_up(&ch->notifier_wq);
+		break;
+	case TEGRA_VGPU_GR_INTR_SEMAPHORE_TIMEOUT:
+		gk20a_set_error_notifier(ch,
+				NVGPU_CHANNEL_GR_SEMAPHORE_TIMEOUT);
+		break;
+	case TEGRA_VGPU_GR_INTR_ILLEGAL_NOTIFY:
+		gk20a_set_error_notifier(ch,
+					NVGPU_CHANNEL_GR_ILLEGAL_NOTIFY);
+	case TEGRA_VGPU_GR_INTR_ILLEGAL_METHOD:
+		break;
+	case TEGRA_VGPU_GR_INTR_ILLEGAL_CLASS:
+		gk20a_set_error_notifier(ch,
+					NVGPU_CHANNEL_GR_ERROR_SW_NOTIFY);
+		break;
+	case TEGRA_VGPU_GR_INTR_FECS_ERROR:
+		break;
+	case TEGRA_VGPU_GR_INTR_CLASS_ERROR:
+		gk20a_set_error_notifier(ch,
+					NVGPU_CHANNEL_GR_ERROR_SW_NOTIFY);
+		break;
+	case TEGRA_VGPU_GR_INTR_FIRMWARE_METHOD:
+		gk20a_set_error_notifier(ch,
+				NVGPU_CHANNEL_GR_ERROR_SW_NOTIFY);
+		break;
+	case TEGRA_VGPU_GR_INTR_EXCEPTION:
+		gk20a_set_error_notifier(ch,
+				NVGPU_CHANNEL_GR_ERROR_SW_NOTIFY);
+		break;
+	default:
+		WARN_ON(1);
+		break;
+	}
 
 	return 0;
 }

drivers/gpu/nvgpu/vgpu/vgpu.c

@@ -1,7 +1,7 @@
 /*
  * Virtualized GPU
  *
- * Copyright (c) 2014-2015 NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2014-2015, 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,
@@ -114,6 +114,8 @@ static int vgpu_intr_thread(void *dev_id)
 
 		if (msg->unit == TEGRA_VGPU_INTR_GR)
 			vgpu_gr_isr(g, &msg->info.gr_intr);
+		else if (msg->unit == TEGRA_VGPU_INTR_FIFO)
+			vgpu_fifo_isr(g, &msg->info.fifo_intr);
 
 		tegra_gr_comm_release(handle);
 	}

drivers/gpu/nvgpu/vgpu/vgpu.h

@@ -27,6 +27,7 @@ int vgpu_probe(struct platform_device *dev);
 int vgpu_remove(struct platform_device *dev);
 u64 vgpu_bar1_map(struct gk20a *g, struct sg_table **sgt, u64 size);
 int vgpu_gr_isr(struct gk20a *g, struct tegra_vgpu_gr_intr_info *info);
+int vgpu_fifo_isr(struct gk20a *g, struct tegra_vgpu_fifo_intr_info *info);
 void vgpu_init_fifo_ops(struct gpu_ops *gops);
 void vgpu_init_gr_ops(struct gpu_ops *gops);
 void vgpu_init_ltc_ops(struct gpu_ops *gops);
@@ -56,11 +57,18 @@ static inline int vgpu_remove(struct platform_device *dev)
 {
 	return -ENOSYS;
 }
-static inline u64 vgpu_bar1_map(struct gk20a *g, struct sg_table **sgt, u64 size)
+static inline u64 vgpu_bar1_map(struct gk20a *g, struct sg_table **sgt,
+				u64 size)
 {
 	return 0;
 }
-static inline int vgpu_gr_isr(struct gk20a *g, struct tegra_vgpu_gr_intr_info *info)
+static inline int vgpu_gr_isr(struct gk20a *g,
+			struct tegra_vgpu_gr_intr_info *info)
+{
+	return 0;
+}
+static inline int vgpu_fifo_isr(struct gk20a *g,
+			struct tegra_vgpu_fifo_intr_info *info)
 {
 	return 0;
 }

include/linux/tegra_vgpu.h

@@ -1,7 +1,7 @@
 /*
  * Tegra GPU Virtualization Interfaces to Server
  *
- * Copyright (c) 2014, NVIDIA Corporation. All rights reserved.
+ * Copyright (c) 2014-2015, 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,
@@ -210,7 +210,18 @@ struct tegra_vgpu_cmd_msg {
 };
 
 enum {
-	TEGRA_VGPU_GR_INTR_NOTIFY = 0
+	TEGRA_VGPU_GR_INTR_NOTIFY = 0,
+	TEGRA_VGPU_GR_INTR_SEMAPHORE_TIMEOUT,
+	TEGRA_VGPU_GR_INTR_ILLEGAL_NOTIFY,
+	TEGRA_VGPU_GR_INTR_ILLEGAL_METHOD,
+	TEGRA_VGPU_GR_INTR_ILLEGAL_CLASS,
+	TEGRA_VGPU_GR_INTR_FECS_ERROR,
+	TEGRA_VGPU_GR_INTR_CLASS_ERROR,
+	TEGRA_VGPU_GR_INTR_FIRMWARE_METHOD,
+	TEGRA_VGPU_GR_INTR_EXCEPTION,
+	TEGRA_VGPU_FIFO_INTR_PBDMA,
+	TEGRA_VGPU_FIFO_INTR_CTXSW_TIMEOUT,
+	TEGRA_VGPU_FIFO_INTR_MMU_FAULT
 };
 
 struct tegra_vgpu_gr_intr_info {
@@ -218,8 +229,14 @@ struct tegra_vgpu_gr_intr_info {
 	u32 chid;
 };
 
+struct tegra_vgpu_fifo_intr_info {
+	u32 type;
+	u32 chid;
+};
+
 enum {
-	TEGRA_VGPU_INTR_GR = 0
+	TEGRA_VGPU_INTR_GR = 0,
+	TEGRA_VGPU_INTR_FIFO
 };
 
 enum {
@@ -232,6 +249,7 @@ struct tegra_vgpu_intr_msg {
 	u32 unit;
 	union {
 		struct tegra_vgpu_gr_intr_info gr_intr;
+		struct tegra_vgpu_fifo_intr_info fifo_intr;
 	} info;
 };