From 1786bf56e4180dfd6a51929230e60d11b899032e Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Tue, 11 Dec 2018 14:50:02 +1000
Subject: [PATCH] drm/nouveau/imem/nv50: support pinning objects in BAR2 and returning address
Git-commit: 1786bf56e4180dfd6a51929230e60d11b899032e
Patch-mainline: v5.0-rc1
References: bsc#1133593

Various structures are accessed by the GPU through BAR2 for some reason
on newer GPUs.  This commit makes it more convenient to handle.

Will be used for GP100- fault buffers, and GV100- fault method buffers.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/nouveau/include/nvkm/core/memory.h |  2 ++
 drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c | 16 +++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/core/memory.h b/drivers/gpu/drm/nouveau/include/nvkm/core/memory.h
index 05f505de0075..f34c80310861 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/core/memory.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/core/memory.h
@@ -29,6 +29,7 @@ struct nvkm_memory_func {
 	void *(*dtor)(struct nvkm_memory *);
 	enum nvkm_memory_target (*target)(struct nvkm_memory *);
 	u8 (*page)(struct nvkm_memory *);
+	u64 (*bar2)(struct nvkm_memory *);
 	u64 (*addr)(struct nvkm_memory *);
 	u64 (*size)(struct nvkm_memory *);
 	void (*boot)(struct nvkm_memory *, struct nvkm_vmm *);
@@ -56,6 +57,7 @@ void nvkm_memory_tags_put(struct nvkm_memory *, struct nvkm_device *,
 
 #define nvkm_memory_target(p) (p)->func->target(p)
 #define nvkm_memory_page(p) (p)->func->page(p)
+#define nvkm_memory_bar2(p) (p)->func->bar2(p)
 #define nvkm_memory_addr(p) (p)->func->addr(p)
 #define nvkm_memory_size(p) (p)->func->size(p)
 #define nvkm_memory_boot(p,v) (p)->func->boot((p),(v))
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
index db48a1daca0c..02c4eb28cef4 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/instmem/nv50.c
@@ -288,6 +288,19 @@ nv50_instobj_addr(struct nvkm_memory *memory)
 	return nvkm_memory_addr(nv50_instobj(memory)->ram);
 }
 
+static u64
+nv50_instobj_bar2(struct nvkm_memory *memory)
+{
+	struct nv50_instobj *iobj = nv50_instobj(memory);
+	u64 addr = ~0ULL;
+	if (nv50_instobj_acquire(&iobj->base.memory)) {
+		iobj->lru.next = NULL; /* Exclude from eviction. */
+		addr = iobj->bar->addr;
+	}
+	nv50_instobj_release(&iobj->base.memory);
+	return addr;
+}
+
 static enum nvkm_memory_target
 nv50_instobj_target(struct nvkm_memory *memory)
 {
@@ -325,8 +338,9 @@ static const struct nvkm_memory_func
 nv50_instobj_func = {
 	.dtor = nv50_instobj_dtor,
 	.target = nv50_instobj_target,
-	.size = nv50_instobj_size,
+	.bar2 = nv50_instobj_bar2,
 	.addr = nv50_instobj_addr,
+	.size = nv50_instobj_size,
 	.boot = nv50_instobj_boot,
 	.acquire = nv50_instobj_acquire,
 	.release = nv50_instobj_release,
-- 
2.16.4