From d44960d4242ece619e9877601ba90af19ef2afc0 Mon Sep 17 00:00:00 2001
From: Sami Kiminki <skiminki@nvidia.com>
Date: Mon, 18 May 2020 17:11:31 +0300
Subject: [PATCH] gpu: nvgpu: add PDI reporting for GP10B (Linux)

Read the T186 SoC PDI fuse registers to retrieve the per-device
identifier for GP10B.

Bug 2957580

Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Change-Id: Ie5031a005ca251636614d27c2dc77bddfce0ea21
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2350930
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
---
 drivers/gpu/nvgpu/hal/init/hal_gp10b.c |  2 ++
 drivers/gpu/nvgpu/include/nvgpu/fuse.h | 19 +++++++++++++++++++
 drivers/gpu/nvgpu/os/linux/fuse.c      | 19 +++++++++++++++++++
 drivers/gpu/nvgpu/os/posix/fuse.c      |  7 +++++++
 4 files changed, 47 insertions(+)

diff --git a/drivers/gpu/nvgpu/hal/init/hal_gp10b.c b/drivers/gpu/nvgpu/hal/init/hal_gp10b.c
index 9275bfd19..ac8d7ad61 100644
--- a/drivers/gpu/nvgpu/hal/init/hal_gp10b.c
+++ b/drivers/gpu/nvgpu/hal/init/hal_gp10b.c
@@ -1217,6 +1217,8 @@ static const struct gpu_ops gp10b_ops = {
 		.read_vin_cal_gain_offset_fuse = NULL,
 		.read_gcplex_config_fuse =
 				nvgpu_tegra_fuse_read_gcplex_config_fuse,
+		.read_per_device_identifier =
+			nvgpu_tegra_fuse_read_per_device_identifier,
 	},
 	.top = {
 		.device_info_parse_enum = gm20b_device_info_parse_enum,
diff --git a/drivers/gpu/nvgpu/include/nvgpu/fuse.h b/drivers/gpu/nvgpu/include/nvgpu/fuse.h
index 547758c97..e52f77e8c 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/fuse.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/fuse.h
@@ -105,6 +105,18 @@ void nvgpu_tegra_fuse_write_opt_gpu_tpc1_disable(struct gk20a *g, u32 val);
  */
 int nvgpu_tegra_fuse_read_gcplex_config_fuse(struct gk20a *g, u32 *val);
 
+/**
+ * @brief - Reads the per-device identifier fuses.
+ *
+ * @param g [in] - GPU super structure.
+ * @param pdi [out] - Per-device identifier
+ *
+ * The per-device identifier fuses are FUSE_PDI0 and FUSE_PDI1.
+ *
+ * @return 0 on success
+ */
+int nvgpu_tegra_fuse_read_per_device_identifier(struct gk20a *g, u64 *pdi);
+
 #else /* CONFIG_NVGPU_TEGRA_FUSE */
 
 #ifdef CONFIG_NVGPU_NON_FUSA
@@ -150,5 +162,12 @@ static inline int nvgpu_tegra_fuse_read_gcplex_config_fuse(struct gk20a *g,
 	return 0;
 }
 
+static inline int nvgpu_tegra_fuse_read_per_device_identifier(struct gk20a *g, u64 *pdi)
+{
+	*pdi = 0U;
+
+	return 0;
+}
+
 #endif /* CONFIG_NVGPU_TEGRA_FUSE */
 #endif /* NVGPU_FUSE_H */
diff --git a/drivers/gpu/nvgpu/os/linux/fuse.c b/drivers/gpu/nvgpu/os/linux/fuse.c
index 3dc2013a7..ca2748d19 100644
--- a/drivers/gpu/nvgpu/os/linux/fuse.c
+++ b/drivers/gpu/nvgpu/os/linux/fuse.c
@@ -55,3 +55,22 @@ int nvgpu_tegra_fuse_read_reserved_calib(struct gk20a *g, u32 *val)
 {
 	return tegra_fuse_readl(FUSE_RESERVED_CALIB0_0, val);
 }
+
+int nvgpu_tegra_fuse_read_per_device_identifier(struct gk20a *g, u64 *pdi)
+{
+	u32 lo = 0U;
+	u32 hi = 0U;
+	int err;
+
+	err = tegra_fuse_readl(FUSE_PDI0, &lo);
+	if (err)
+		return err;
+
+	err = tegra_fuse_readl(FUSE_PDI1, &hi);
+	if (err)
+		return err;
+
+	*pdi = ((u64)lo) | (((u64)hi) << 32);
+
+	return 0;
+}
diff --git a/drivers/gpu/nvgpu/os/posix/fuse.c b/drivers/gpu/nvgpu/os/posix/fuse.c
index cab09f6ef..c97d9eb02 100644
--- a/drivers/gpu/nvgpu/os/posix/fuse.c
+++ b/drivers/gpu/nvgpu/os/posix/fuse.c
@@ -115,3 +115,10 @@ int nvgpu_tegra_fuse_read_reserved_calib(struct gk20a *g, u32 *val)
 	return p->callbacks->tegra_fuse_readl(FUSE_RESERVED_CALIB0_0, val);
 }
 #endif
+
+int nvgpu_tegra_fuse_read_per_device_identifier(struct gk20a *g, u64 *pdi)
+{
+	*pdi = 0;
+
+	return 0;
+}