drm/amdgpu: Enable reading FRU chip via I2C v3

Allow for reading of information like manufacturer, product number
and serial number from the FRU chip. Report the serial number as
the new sysfs file serial_number. Note that this only works on
server cards, as consumer cards do not feature the FRU chip, which
contains this information.

v2: Add documentation to amdgpu.rst, add helper functions,
    rename functions for consistency, fix bad starting offset
v3: Remove testing definitions

Signed-off-by: Kent Russell <kent.russell@amd.com>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 90 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index faa3e7102156..f422ef58b4d8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -64,6 +64,7 @@
 #include "amdgpu_xgmi.h"
 #include "amdgpu_ras.h"
 #include "amdgpu_pmu.h"
+#include "amdgpu_fru_eeprom.h"
 
 #include <linux/suspend.h>
 #include <drm/task_barrier.h>
@@ -138,6 +139,72 @@ static DEVICE_ATTR(pcie_replay_count, S_IRUGO,
 static void amdgpu_device_get_pcie_info(struct amdgpu_device *adev);
 
 /**
+ * DOC: product_name
+ *
+ * The amdgpu driver provides a sysfs API for reporting the product name
+ * for the device
+ * The file serial_number is used for this and returns the product name
+ * as returned from the FRU.
+ * NOTE: This is only available for certain server cards
+ */
+
+static ssize_t amdgpu_device_get_product_name(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", adev->product_name);
+}
+
+static DEVICE_ATTR(product_name, S_IRUGO,
+		amdgpu_device_get_product_name, NULL);
+
+/**
+ * DOC: product_number
+ *
+ * The amdgpu driver provides a sysfs API for reporting the part number
+ * for the device
+ * The file serial_number is used for this and returns the part number
+ * as returned from the FRU.
+ * NOTE: This is only available for certain server cards
+ */
+
+static ssize_t amdgpu_device_get_product_number(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", adev->product_number);
+}
+
+static DEVICE_ATTR(product_number, S_IRUGO,
+		amdgpu_device_get_product_number, NULL);
+
+/**
+ * DOC: serial_number
+ *
+ * The amdgpu driver provides a sysfs API for reporting the serial number
+ * for the device
+ * The file serial_number is used for this and returns the serial number
+ * as returned from the FRU.
+ * NOTE: This is only available for certain server cards
+ */
+
+static ssize_t amdgpu_device_get_serial_number(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = ddev->dev_private;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n", adev->serial);
+}
+
+static DEVICE_ATTR(serial_number, S_IRUGO,
+		amdgpu_device_get_serial_number, NULL);
+
+/**
  * amdgpu_device_supports_boco - Is the device a dGPU with HG/PX power control
  *
  * @dev: drm_device pointer
@@ -1975,6 +2042,8 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
 		amdgpu_xgmi_add_device(adev);
 	amdgpu_amdkfd_device_init(adev);
 
+	amdgpu_fru_get_product_info(adev);
+
 init_failed:
 	if (amdgpu_sriov_vf(adev))
 		amdgpu_virt_release_full_gpu(adev, true);
@@ -3189,6 +3258,24 @@ fence_driver_init:
 		return r;
 	}
 
+	r = device_create_file(adev->dev, &dev_attr_product_name);
+	if (r) {
+		dev_err(adev->dev, "Could not create product_name");
+		return r;
+	}
+
+	r = device_create_file(adev->dev, &dev_attr_product_number);
+	if (r) {
+		dev_err(adev->dev, "Could not create product_number");
+		return r;
+	}
+
+	r = device_create_file(adev->dev, &dev_attr_serial_number);
+	if (r) {
+		dev_err(adev->dev, "Could not create serial_number");
+		return r;
+	}
+
 	if (IS_ENABLED(CONFIG_PERF_EVENTS))
 		r = amdgpu_pmu_init(adev);
 	if (r)
@@ -3271,6 +3358,9 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
 	device_remove_file(adev->dev, &dev_attr_pcie_replay_count);
 	if (adev->ucode_sysfs_en)
 		amdgpu_ucode_sysfs_fini(adev);
+	device_remove_file(adev->dev, &dev_attr_product_name);
+	device_remove_file(adev->dev, &dev_attr_product_number);
+	device_remove_file(adev->dev, &dev_attr_serial_number);
 	if (IS_ENABLED(CONFIG_PERF_EVENTS))
 		amdgpu_pmu_fini(adev);
 	if (amdgpu_discovery && adev->asic_type >= CHIP_NAVI10)