gpu: nvgpu: detect vidmem configuration from HW

Read video memory size from hardware during initialization for devices
that support it.

JIRA DNVGPU-14

Change-Id: I84e1bca0eaac8dc204e1fb82628acc6b52c3e5cc
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1157212
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gp106/mm_gp106.c b/drivers/gpu/nvgpu/gp106/mm_gp106.c
new file mode 100644
index 00000000..1a4b6dd1
--- /dev/null
+++ b/drivers/gpu/nvgpu/gp106/mm_gp106.c
@@ -0,0 +1,39 @@
+/*
+ * GP106 memory management
+ *
+ * Copyright (c) 2016, 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,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include "gk20a/gk20a.h"
+#include "gp10b/mm_gp10b.h"
+
+#include "hw_fb_gp106.h"
+
+static size_t gp106_mm_get_vidmem_size(struct gk20a *g)
+{
+        u32 range = gk20a_readl(g, fb_mmu_local_memory_range_r());
+        u32 mag = fb_mmu_local_memory_range_lower_mag_v(range);
+        u32 scale = fb_mmu_local_memory_range_lower_scale_v(range);
+        u32 ecc = fb_mmu_local_memory_range_ecc_mode_v(range);
+        size_t bytes = ((size_t)mag << scale) * SZ_1M;
+
+        if (ecc)
+                bytes = bytes / 16 * 15;
+
+        return bytes;
+}
+
+void gp106_init_mm(struct gpu_ops *gops)
+{
+        gp10b_init_mm(gops);
+        gops->mm.get_vidmem_size = gp106_mm_get_vidmem_size;
+}