[Nouveau] [PATCH 2/3] ltc/gf100: add flush/invalidate functions

[Alexandre Courbot]

Allow clients to manually flush and invalidate L2. This will be useful
for Tegra systems for which we want to write instmem using the CPU.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
---
 drm/nouveau/include/nvkm/subdev/ltc.h |  1 +
 drm/nouveau/nvkm/subdev/ltc/gf100.c   | 36 +++++++++++++++++++++++++++++++++++
 drm/nouveau/nvkm/subdev/ltc/gk104.c   |  2 ++
 drm/nouveau/nvkm/subdev/ltc/gm107.c   |  2 ++
 drm/nouveau/nvkm/subdev/ltc/priv.h    |  2 ++
 5 files changed, 43 insertions(+)

diff --git a/drm/nouveau/include/nvkm/subdev/ltc.h b/drm/nouveau/include/nvkm/subdev/ltc.h
index 5464fcf482f1..3d4dbbf9aab3 100644
--- a/drm/nouveau/include/nvkm/subdev/ltc.h
+++ b/drm/nouveau/include/nvkm/subdev/ltc.h
@@ -35,5 +35,6 @@ void nvkm_ltc_flush(struct nvkm_ltc *);
 
 int gf100_ltc_new(struct nvkm_device *, int, struct nvkm_ltc **);
 int gk104_ltc_new(struct nvkm_device *, int, struct nvkm_ltc **);
+int gk20a_ltc_new(struct nvkm_device *, int, struct nvkm_ltc **);
 int gm107_ltc_new(struct nvkm_device *, int, struct nvkm_ltc **);
 #endif
diff --git a/drm/nouveau/nvkm/subdev/ltc/gf100.c b/drm/nouveau/nvkm/subdev/ltc/gf100.c
index 45ac765b753e..42ae77533865 100644
--- a/drm/nouveau/nvkm/subdev/ltc/gf100.c
+++ b/drm/nouveau/nvkm/subdev/ltc/gf100.c
@@ -122,6 +122,40 @@ gf100_ltc_intr(struct nvkm_ltc *ltc)
 	}
 }
 
+void
+gf100_ltc_invalidate(struct nvkm_ltc *ltc)
+{
+	struct nvkm_device *device = ltc->subdev.device;
+	s64 taken;
+
+	nvkm_wr32(device, 0x70004, 0x00000001);
+	if ((taken = nvkm_msec(device, 2000,
+		if ((nvkm_rd32(device, 0x70004) & 0x00000003) == 0x00000000)
+			break;
+	)) < 0)
+		nvkm_warn(&ltc->subdev, "L2 invalidate timeout\n");
+
+	if (taken > 0)
+		nvkm_debug(&ltc->subdev, "LTC invalidate took %lld ns\n", taken);
+}
+
+void
+gf100_ltc_flush(struct nvkm_ltc *ltc)
+{
+	struct nvkm_device *device = ltc->subdev.device;
+	s64 taken;
+
+	nvkm_wr32(device, 0x70010, 0x00000001);
+	if ((taken = nvkm_msec(device, 2000,
+		if ((nvkm_rd32(device, 0x70010) & 0x00000003) == 0x00000000)
+			break;
+	)) < 0)
+		nvkm_warn(&ltc->subdev, "L2 flush timeout\n");
+
+	if (taken > 0)
+		nvkm_debug(&ltc->subdev, "LTC flush took %lld ns\n", taken);
+}
+
 /* TODO: Figure out tag memory details and drop the over-cautious allocation.
  */
 int
@@ -215,6 +249,8 @@ gf100_ltc = {
 	.zbc = 16,
 	.zbc_clear_color = gf100_ltc_zbc_clear_color,
 	.zbc_clear_depth = gf100_ltc_zbc_clear_depth,
+	.invalidate = gf100_ltc_invalidate,
+	.flush = gf100_ltc_flush,
 };
 
 int
diff --git a/drm/nouveau/nvkm/subdev/ltc/gk104.c b/drm/nouveau/nvkm/subdev/ltc/gk104.c
index 839e6b4c597b..b4f6e0034d58 100644
--- a/drm/nouveau/nvkm/subdev/ltc/gk104.c
+++ b/drm/nouveau/nvkm/subdev/ltc/gk104.c
@@ -45,6 +45,8 @@ gk104_ltc = {
 	.zbc = 16,
 	.zbc_clear_color = gf100_ltc_zbc_clear_color,
 	.zbc_clear_depth = gf100_ltc_zbc_clear_depth,
+	.invalidate = gf100_ltc_invalidate,
+	.flush = gf100_ltc_flush,
 };
 
 int
diff --git a/drm/nouveau/nvkm/subdev/ltc/gm107.c b/drm/nouveau/nvkm/subdev/ltc/gm107.c
index 389331bb63ba..3043bbfd7384 100644
--- a/drm/nouveau/nvkm/subdev/ltc/gm107.c
+++ b/drm/nouveau/nvkm/subdev/ltc/gm107.c
@@ -138,6 +138,8 @@ gm107_ltc = {
 	.zbc = 16,
 	.zbc_clear_color = gm107_ltc_zbc_clear_color,
 	.zbc_clear_depth = gm107_ltc_zbc_clear_depth,
+	.invalidate = gf100_ltc_invalidate,
+	.flush = gf100_ltc_flush,
 };
 
 int
diff --git a/drm/nouveau/nvkm/subdev/ltc/priv.h b/drm/nouveau/nvkm/subdev/ltc/priv.h
index 6f66bd03f829..4e3755b82769 100644
--- a/drm/nouveau/nvkm/subdev/ltc/priv.h
+++ b/drm/nouveau/nvkm/subdev/ltc/priv.h
@@ -29,4 +29,6 @@ void gf100_ltc_cbc_clear(struct nvkm_ltc *, u32, u32);
 void gf100_ltc_cbc_wait(struct nvkm_ltc *);
 void gf100_ltc_zbc_clear_color(struct nvkm_ltc *, int, const u32[4]);
 void gf100_ltc_zbc_clear_depth(struct nvkm_ltc *, int, const u32);
+void gf100_ltc_invalidate(struct nvkm_ltc *);
+void gf100_ltc_flush(struct nvkm_ltc *);
 #endif
-- 
2.5.1