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: If190f2d89f7148520ee274ca674f972987c8056d
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1157215
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

drivers/gpu/nvgpu/Makefile

@@ -80,6 +80,7 @@ nvgpu-y := \
 	gm206/hal_gm206.o \
 	gm206/gr_gm206.o \
 	gm206/acr_gm206.o \
+	gm206/mm_gm206.o \
 	gm206/pmu_gm206.o \
 	gm206/ce_gm206.o
 

drivers/gpu/nvgpu/gk20a/gk20a.h

@@ -524,6 +524,7 @@ struct gpu_ops {
 		u64 (*get_iova_addr)(struct gk20a *g, struct scatterlist *sgl,
 					 u32 flags);
 		int (*bar1_bind)(struct gk20a *g, u64 bar1_iova);
+		size_t (*get_vidmem_size)(struct gk20a *g);
 	} mm;
 	struct {
 		int (*init_therm_setup_hw)(struct gk20a *g);

drivers/gpu/nvgpu/gk20a/mm_gk20a.c

@@ -613,6 +613,20 @@ static void gk20a_init_pramin(struct mm_gk20a *mm)
 	mm->force_pramin = GK20A_FORCE_PRAMIN_DEFAULT;
 }
 
+static int gk20a_init_vidmem(struct mm_gk20a *mm)
+{
+	struct gk20a *g = mm->g;
+	size_t size = g->ops.mm.get_vidmem_size ?
+		g->ops.mm.get_vidmem_size(g) : 0;
+
+	if (!size)
+		return 0;
+
+	mm->vidmem_size = size;
+
+	return 0;
+}
+
 int gk20a_init_mm_setup_sw(struct gk20a *g)
 {
 	struct mm_gk20a *mm = &g->mm;
@@ -637,6 +651,7 @@ int gk20a_init_mm_setup_sw(struct gk20a *g)
 		       (int)(mm->channel.kernel_size >> 20));
 
 	gk20a_init_pramin(mm);
+	gk20a_init_vidmem(mm);
 
 	err = gk20a_alloc_sysmem_flush(g);
 	if (err)

drivers/gpu/nvgpu/gk20a/mm_gk20a.h

@@ -372,6 +372,8 @@ struct mm_gk20a {
 #else
 	bool force_pramin; /* via debugfs */
 #endif
+
+	size_t vidmem_size;
 };
 
 int gk20a_mm_init(struct mm_gk20a *mm);

drivers/gpu/nvgpu/gm206/hal_gm206.c

@@ -21,6 +21,7 @@
 #include "gm20b/mc_gm20b.h"
 #include "gm20b/ltc_gm20b.h"
 #include "gm20b/mm_gm20b.h"
+#include "gm206/mm_gm206.h"
 #include "ce_gm206.h"
 #include "gm20b/fb_gm20b.h"
 #include "gm20b/pmu_gm20b.h"
@@ -188,7 +189,7 @@ int gm206_init_hal(struct gk20a *g)
 	gm206_init_fifo(gops);
 	gm206_init_ce(gops);
 	gm20b_init_gr_ctx(gops);
-	gm20b_init_mm(gops);
+	gm206_init_mm(gops);
 	gm206_init_pmu_ops(gops);
 	gm20b_init_clk_ops(gops);
 	gm20b_init_regops(gops);

drivers/gpu/nvgpu/gm206/hw_fbpa_gm206.h

@@ -0,0 +1,61 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Function naming determines intended use:
+ *
+ *     <x>_r(void) : Returns the offset for register <x>.
+ *
+ *     <x>_o(void) : Returns the offset for element <x>.
+ *
+ *     <x>_w(void) : Returns the word offset for word (4 byte) element <x>.
+ *
+ *     <x>_<y>_s(void) : Returns size of field <y> of register <x> in bits.
+ *
+ *     <x>_<y>_f(u32 v) : Returns a value based on 'v' which has been shifted
+ *         and masked to place it at field <y> of register <x>.  This value
+ *         can be |'d with others to produce a full register value for
+ *         register <x>.
+ *
+ *     <x>_<y>_m(void) : Returns a mask for field <y> of register <x>.  This
+ *         value can be ~'d and then &'d to clear the value of field <y> for
+ *         register <x>.
+ *
+ *     <x>_<y>_<z>_f(void) : Returns the constant value <z> after being shifted
+ *         to place it at field <y> of register <x>.  This value can be |'d
+ *         with others to produce a full register value for <x>.
+ *
+ *     <x>_<y>_v(u32 r) : Returns the value of field <y> from a full register
+ *         <x> value 'r' after being shifted to place its LSB at bit 0.
+ *         This value is suitable for direct comparison with other unshifted
+ *         values appropriate for use in field <y> of register <x>.
+ *
+ *     <x>_<y>_<z>_v(void) : Returns the constant value for <z> defined for
+ *         field <y> of register <x>.  This value is suitable for direct
+ *         comparison with unshifted values appropriate for use in field <y>
+ *         of register <x>.
+ */
+#ifndef _hw_fbpa_gp106_h_
+#define _hw_fbpa_gp106_h_
+
+static inline u32 fbpa_cstatus_r(void)
+{
+	return 0x0010f20c;
+}
+static inline u32 fbpa_cstatus_ramamount_v(u32 r)
+{
+	return (r >> 0) & 0x1ffff;
+}
+#endif

drivers/gpu/nvgpu/gm206/hw_top_gm206.h

@@ -74,6 +74,14 @@ static inline u32 top_num_fbps_value_v(u32 r)
 {
 	return (r >> 0) & 0x1f;
 }
+static inline u32 top_num_fbpas_r(void)
+{
+	return 0x0002243c;
+}
+static inline u32 top_num_fbpas_value_v(u32 r)
+{
+	return (r >> 0) & 0x1f;
+}
 static inline u32 top_ltc_per_fbp_r(void)
 {
 	return 0x00022450;

drivers/gpu/nvgpu/gm206/mm_gm206.c

@@ -0,0 +1,35 @@
+/*
+ * GM206 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 "gm20b/mm_gm20b.h"
+
+#include "hw_fbpa_gm206.h"
+#include "hw_top_gm206.h"
+
+static size_t gm206_mm_get_vidmem_size(struct gk20a *g)
+{
+	u32 fbpas = top_num_fbpas_value_v(
+			gk20a_readl(g, top_num_fbpas_r()));
+	u32 ram = fbpa_cstatus_ramamount_v(
+			gk20a_readl(g, fbpa_cstatus_r()));
+	return (size_t)fbpas * ram * SZ_1M;
+}
+
+void gm206_init_mm(struct gpu_ops *gops)
+{
+	gm20b_init_mm(gops);
+	gops->mm.get_vidmem_size = gm206_mm_get_vidmem_size;
+}

drivers/gpu/nvgpu/gm206/mm_gm206.h

@@ -0,0 +1,24 @@
+/*
+ * GM206 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.
+ */
+
+#ifndef MM_GM206_H
+#define MM_GM206_H
+
+struct gpu_ops;
+
+void gm206_init_mm(struct gpu_ops *gops);
+
+#endif
+