drm/nve0/ibus: handle PIBUS interrupts to prevent storm

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/Makefile

@@ -73,6 +73,7 @@ nouveau-y += core/subdev/gpio/nvd0.o
 nouveau-y += core/subdev/i2c/base.o
 nouveau-y += core/subdev/i2c/aux.o
 nouveau-y += core/subdev/i2c/bit.o
+nouveau-y += core/subdev/ibus/nve0.o
 nouveau-y += core/subdev/instmem/base.o
 nouveau-y += core/subdev/instmem/nv04.o
 nouveau-y += core/subdev/instmem/nv40.o

drivers/gpu/drm/nouveau/core/include/core/device.h

@@ -17,6 +17,7 @@ enum nv_subdev_type {
 	NVDEV_SUBDEV_TIMER,
 	NVDEV_SUBDEV_FB,
 	NVDEV_SUBDEV_LTCG,
+	NVDEV_SUBDEV_IBUS,
 	NVDEV_SUBDEV_INSTMEM,
 	NVDEV_SUBDEV_VM,
 	NVDEV_SUBDEV_BAR,

drivers/gpu/drm/nouveau/core/include/subdev/ibus.h

@@ -0,0 +1,33 @@
+#ifndef __NOUVEAU_IBUS_H__
+#define __NOUVEAU_IBUS_H__
+
+#include <core/subdev.h>
+#include <core/device.h>
+
+struct nouveau_ibus {
+	struct nouveau_subdev base;
+};
+
+static inline struct nouveau_ibus *
+nouveau_ibus(void *obj)
+{
+	return (void *)nv_device(obj)->subdev[NVDEV_SUBDEV_IBUS];
+}
+
+#define nouveau_ibus_create(p,e,o,d)                                           \
+	nouveau_subdev_create_((p), (e), (o), 0, "PIBUS", "ibus",              \
+			       sizeof(**d), (void **)d)
+#define nouveau_ibus_destroy(p)                                                \
+	nouveau_subdev_destroy(&(p)->base)
+#define nouveau_ibus_init(p)                                                   \
+	nouveau_subdev_init(&(p)->base)
+#define nouveau_ibus_fini(p,s)                                                 \
+	nouveau_subdev_fini(&(p)->base, (s))
+
+#define _nouveau_ibus_dtor _nouveau_subdev_dtor
+#define _nouveau_ibus_init _nouveau_subdev_init
+#define _nouveau_ibus_fini _nouveau_subdev_fini
+
+extern struct nouveau_oclass nve0_ibus_oclass;
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/device/nve0.c

@@ -33,6 +33,7 @@
 #include <subdev/timer.h>
 #include <subdev/fb.h>
 #include <subdev/ltcg.h>
+#include <subdev/ibus.h>
 #include <subdev/instmem.h>
 #include <subdev/vm.h>
 #include <subdev/bar.h>
@@ -60,6 +61,7 @@ nve0_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] = &nvc0_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_LTCG   ] = &nvc0_ltcg_oclass;
+		device->oclass[NVDEV_SUBDEV_IBUS   ] = &nve0_ibus_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
 		device->oclass[NVDEV_SUBDEV_VM     ] = &nvc0_vmmgr_oclass;
 		device->oclass[NVDEV_SUBDEV_BAR    ] = &nvc0_bar_oclass;
@@ -83,6 +85,7 @@ nve0_identify(struct nouveau_device *device)
 		device->oclass[NVDEV_SUBDEV_TIMER  ] = &nv04_timer_oclass;
 		device->oclass[NVDEV_SUBDEV_FB     ] = &nvc0_fb_oclass;
 		device->oclass[NVDEV_SUBDEV_LTCG   ] = &nvc0_ltcg_oclass;
+		device->oclass[NVDEV_SUBDEV_IBUS   ] = &nve0_ibus_oclass;
 		device->oclass[NVDEV_SUBDEV_INSTMEM] = &nv50_instmem_oclass;
 		device->oclass[NVDEV_SUBDEV_VM     ] = &nvc0_vmmgr_oclass;
 		device->oclass[NVDEV_SUBDEV_BAR    ] = &nvc0_bar_oclass;

drivers/gpu/drm/nouveau/core/subdev/ibus/nve0.c

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2012 Red Hat 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.
+ *
+ * Authors: Ben Skeggs
+ */
+
+#include <subdev/ibus.h>
+
+struct nve0_ibus_priv {
+	struct nouveau_ibus base;
+};
+
+static void
+nve0_ibus_intr_hub(struct nve0_ibus_priv *priv, int i)
+{
+	u32 addr = nv_rd32(priv, 0x122120 + (i * 0x0800));
+	u32 data = nv_rd32(priv, 0x122124 + (i * 0x0800));
+	u32 stat = nv_rd32(priv, 0x122128 + (i * 0x0800));
+	nv_error(priv, "HUB%d: 0x%06x 0x%08x (0x%08x)\n", i, addr, data, stat);
+	nv_mask(priv, 0x122128 + (i * 0x0800), 0x00000200, 0x00000000);
+}
+
+static void
+nve0_ibus_intr_rop(struct nve0_ibus_priv *priv, int i)
+{
+	u32 addr = nv_rd32(priv, 0x124120 + (i * 0x0800));
+	u32 data = nv_rd32(priv, 0x124124 + (i * 0x0800));
+	u32 stat = nv_rd32(priv, 0x124128 + (i * 0x0800));
+	nv_error(priv, "ROP%d: 0x%06x 0x%08x (0x%08x)\n", i, addr, data, stat);
+	nv_mask(priv, 0x124128 + (i * 0x0800), 0x00000200, 0x00000000);
+}
+
+static void
+nve0_ibus_intr_gpc(struct nve0_ibus_priv *priv, int i)
+{
+	u32 addr = nv_rd32(priv, 0x128120 + (i * 0x0800));
+	u32 data = nv_rd32(priv, 0x128124 + (i * 0x0800));
+	u32 stat = nv_rd32(priv, 0x128128 + (i * 0x0800));
+	nv_error(priv, "GPC%d: 0x%06x 0x%08x (0x%08x)\n", i, addr, data, stat);
+	nv_mask(priv, 0x128128 + (i * 0x0800), 0x00000200, 0x00000000);
+}
+
+static void
+nve0_ibus_intr(struct nouveau_subdev *subdev)
+{
+	struct nve0_ibus_priv *priv = (void *)subdev;
+	u32 intr0 = nv_rd32(priv, 0x120058);
+	u32 intr1 = nv_rd32(priv, 0x12005c);
+	u32 hubnr = nv_rd32(priv, 0x120070);
+	u32 ropnr = nv_rd32(priv, 0x120074);
+	u32 gpcnr = nv_rd32(priv, 0x120078);
+	u32 i;
+
+	for (i = 0; (intr0 & 0x0000ff00) && i < hubnr; i++) {
+		u32 stat = 0x00000100 << i;
+		if (intr0 & stat) {
+			nve0_ibus_intr_hub(priv, i);
+			intr0 &= ~stat;
+		}
+	}
+
+	for (i = 0; (intr0 & 0xffff0000) && i < ropnr; i++) {
+		u32 stat = 0x00010000 << i;
+		if (intr0 & stat) {
+			nve0_ibus_intr_rop(priv, i);
+			intr0 &= ~stat;
+		}
+	}
+
+	for (i = 0; intr1 && i < gpcnr; i++) {
+		u32 stat = 0x00000001 << i;
+		if (intr1 & stat) {
+			nve0_ibus_intr_gpc(priv, i);
+			intr1 &= ~stat;
+		}
+	}
+}
+
+static int
+nve0_ibus_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
+	       struct nouveau_oclass *oclass, void *data, u32 size,
+	       struct nouveau_object **pobject)
+{
+	struct nve0_ibus_priv *priv;
+	int ret;
+
+	ret = nouveau_ibus_create(parent, engine, oclass, &priv);
+	*pobject = nv_object(priv);
+	if (ret)
+		return ret;
+
+	nv_subdev(priv)->intr = nve0_ibus_intr;
+	return 0;
+}
+
+struct nouveau_oclass
+nve0_ibus_oclass = {
+	.handle = NV_SUBDEV(IBUS, 0xe0),
+	.ofuncs = &(struct nouveau_ofuncs) {
+		.ctor = nve0_ibus_ctor,
+		.dtor = _nouveau_ibus_dtor,
+		.init = _nouveau_ibus_init,
+		.fini = _nouveau_ibus_fini,
+	},
+};

drivers/gpu/drm/nouveau/core/subdev/mc/nvc0.c

@@ -40,6 +40,7 @@ nvc0_mc_intr[] = {
 	{ 0x00200000, NVDEV_SUBDEV_GPIO },
 	{ 0x02000000, NVDEV_SUBDEV_LTCG },
 	{ 0x04000000, NVDEV_ENGINE_DISP },
+	{ 0x40000000, NVDEV_SUBDEV_IBUS },
 	{ 0x80000000, NVDEV_ENGINE_SW },
 	{},
 };