[Nouveau] [PATCH v3 2/2] fb/nvaa: Enable non-isometric poller on NVAA/NVAC

[Pierre Moreau]

(This is a v3 of patch "drm/nouveau/fb/nv50: Add PFB writes")

This fix a GPU lockup on 9400M (NVAC) when using acceleration, see
https://bugs.freedesktop.org/show_bug.cgi?id=27501

v2:
- Move code to subdev/fb/nv50.c as suggested by Roy Spliet;
- Remove arbitrary writes to 100c18/100c24
- Replace write to 100c1c of arbitrary value by the address of a scratch page
  as proposed by Ilia Mirkin;
- Remove enabling of bits 16 and 0 as they don't yield in any changes.

v3:
- Move code to subdev/fb/nvaa.c as suggested by Ilia Mirkin.
The following changes were made thanks to information provided by Robert Morell
from NVidia:
- Allocate a dma page for use by the pollers;
- Re-enable pollers at bits 16 and 0;
- Set pollers address to a proper value.

Signed-off-by: Pierre Moreau <pierre.morrow at free.fr>
---
 drm/core/subdev/fb/nvaa.h |  1 +
 nvkm/subdev/fb/nv50.h     |  4 +++
 nvkm/subdev/fb/nvaa.c     | 74 ++++++++++++++++++++++++++++++++++++++++++++---
 nvkm/subdev/fb/nvaa.h     | 19 ++++++++++++
 4 files changed, 94 insertions(+), 4 deletions(-)
 create mode 120000 drm/core/subdev/fb/nvaa.h
 create mode 100644 nvkm/subdev/fb/nvaa.h

diff --git a/drm/core/subdev/fb/nvaa.h b/drm/core/subdev/fb/nvaa.h
new file mode 120000
index 0000000..b450e8c
--- /dev/null
+++ b/drm/core/subdev/fb/nvaa.h
@@ -0,0 +1 @@
+../../../../nvkm/subdev/fb/nvaa.h
\ No newline at end of file
diff --git a/nvkm/subdev/fb/nv50.h b/nvkm/subdev/fb/nv50.h
index c5e5a88..0b20975 100644
--- a/nvkm/subdev/fb/nv50.h
+++ b/nvkm/subdev/fb/nv50.h
@@ -9,6 +9,10 @@ struct nv50_fb_priv {
 	dma_addr_t r100c08;
 };
 
+#define nv50_fb_create(p,e,c,d,o)                                              \
+	nv50_fb_ctor((p), (e), (c), (d), sizeof(**o),                          \
+			(struct nouveau_object **)o)
+
 int  nv50_fb_ctor(struct nouveau_object *, struct nouveau_object *,
 		  struct nouveau_oclass *, void *, u32,
 		  struct nouveau_object **);
diff --git a/nvkm/subdev/fb/nvaa.c b/nvkm/subdev/fb/nvaa.c
index cba8e68..b70ab2f 100644
--- a/nvkm/subdev/fb/nvaa.c
+++ b/nvkm/subdev/fb/nvaa.c
@@ -22,15 +22,81 @@
  * Authors: Ben Skeggs
  */
 
-#include "nv50.h"
+#include "nvaa.h"
+
+int
+nvaa_fb_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
+	     struct nouveau_oclass *oclass, void *data, u32 size,
+	     struct nouveau_object **pobject)
+{
+	struct nouveau_device *device = nv_device(parent);
+	struct nvaa_fb_priv *priv;
+	int ret;
+
+	ret = nv50_fb_create(parent, engine, oclass, data, &priv);
+	*pobject = nv_object(priv);
+	if (ret)
+		return ret;
+
+	priv = (struct nvaa_fb_priv *)(*pobject);
+
+	priv->r100c18_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+	if (priv->r100c18_page) {
+		priv->r100c18 = dma_map_page(nv_device_base(device),
+					     priv->r100c18_page, 0, PAGE_SIZE,
+					     DMA_BIDIRECTIONAL);
+		if (dma_mapping_error(nv_device_base(device), priv->r100c18))
+			return -EFAULT;
+	} else {
+		nv_warn(priv, "failed 0x100c18 page alloc\n");
+	}
+	return 0;
+}
+
+void
+nvaa_fb_dtor(struct nouveau_object *object)
+{
+	struct nouveau_device *device = nv_device(object);
+	struct nvaa_fb_priv *priv = (void *)object;
+
+	if (priv->r100c18_page) {
+		dma_unmap_page(nv_device_base(device), priv->r100c18, PAGE_SIZE,
+			       DMA_BIDIRECTIONAL);
+		__free_page(priv->r100c18_page);
+	}
+
+	nv50_fb_dtor(object);
+}
+
+int
+nvaa_fb_init(struct nouveau_object *object)
+{
+	struct nvaa_fb_priv *priv = (void *)object;
+	int ret;
+
+	ret = nv50_fb_init(object);
+	if (ret)
+		return ret;
+
+	/* Enable NISO poller for various clients and set their associated
+	 * read address, only for MCP77/78 and MCP79/7A. (fd#25701)
+	 */
+	nv_wr32(priv, 0x100c18, priv->r100c18 >> 8);
+	nv_mask(priv, 0x100c14, 0x00000000, 0x00000001);
+	nv_wr32(priv, 0x100c1c, (priv->r100c18 >> 8) + 1);
+	nv_mask(priv, 0x100c14, 0x00000000, 0x00000002);
+	nv_wr32(priv, 0x100c24, (priv->r100c18 >> 8) + 2);
+	nv_mask(priv, 0x100c14, 0x00000000, 0x00010000);
+	return 0;
+}
 
 struct nouveau_oclass *
 nvaa_fb_oclass = &(struct nv50_fb_impl) {
 	.base.base.handle = NV_SUBDEV(FB, 0xaa),
 	.base.base.ofuncs = &(struct nouveau_ofuncs) {
-		.ctor = nv50_fb_ctor,
-		.dtor = nv50_fb_dtor,
-		.init = nv50_fb_init,
+		.ctor = nvaa_fb_ctor,
+		.dtor = nvaa_fb_dtor,
+		.init = nvaa_fb_init,
 		.fini = _nouveau_fb_fini,
 	},
 	.base.memtype = nv50_fb_memtype_valid,
diff --git a/nvkm/subdev/fb/nvaa.h b/nvkm/subdev/fb/nvaa.h
new file mode 100644
index 0000000..84e1eca
--- /dev/null
+++ b/nvkm/subdev/fb/nvaa.h
@@ -0,0 +1,19 @@
+#ifndef __NVKM_FB_NVAA_H__
+#define __NVKM_FB_NVAA_H__
+
+#include "nv50.h"
+
+struct nvaa_fb_priv {
+	struct nv50_fb_priv base;
+	struct page *r100c18_page;
+	dma_addr_t r100c18;
+};
+
+int  nvaa_fb_ctor(struct nouveau_object *, struct nouveau_object *,
+		  struct nouveau_oclass *, void *, u32,
+		  struct nouveau_object **);
+void nvaa_fb_dtor(struct nouveau_object *);
+int  nvaa_fb_init(struct nouveau_object *);
+
+
+#endif
-- 
2.1.3