[PATCH] Enable reading FRU chip via I2C v3
Kent Russell
kent.russell at amd.com
Thu Mar 19 14:16:00 UTC 2020
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 at amd.com>
---
Documentation/gpu/amdgpu.rst | 24 +++
drivers/gpu/drm/amd/amdgpu/Makefile | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 5 +
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 90 +++++++++++
.../gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c | 143 ++++++++++++++++++
.../gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.h | 29 ++++
6 files changed, 292 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.h
diff --git a/Documentation/gpu/amdgpu.rst b/Documentation/gpu/amdgpu.rst
index 0efede580039..d9ea09ec8e24 100644
--- a/Documentation/gpu/amdgpu.rst
+++ b/Documentation/gpu/amdgpu.rst
@@ -202,3 +202,27 @@ busy_percent
.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
:doc: busy_percent
+
+GPU Product Information
+=======================
+
+Information about the GPU can be obtained on certain cards
+via sysfs
+
+product_name
+------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+ :doc: product_name
+
+product_number
+--------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+ :doc: product_name
+
+serial_number
+-------------
+
+.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+ :doc: serial_number
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index c2bbcdd9c875..210d57a4afc8 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -55,7 +55,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
amdgpu_vf_error.o amdgpu_sched.o amdgpu_debugfs.o amdgpu_ids.o \
amdgpu_gmc.o amdgpu_mmhub.o amdgpu_xgmi.o amdgpu_csa.o amdgpu_ras.o amdgpu_vm_cpu.o \
amdgpu_vm_sdma.o amdgpu_discovery.o amdgpu_ras_eeprom.o amdgpu_nbio.o \
- amdgpu_umc.o smu_v11_0_i2c.o
+ amdgpu_umc.o smu_v11_0_i2c.o amdgpu_fru_eeprom.o
amdgpu-$(CONFIG_PERF_EVENTS) += amdgpu_pmu.o
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 87c2523076af..7dd74253e7b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -979,6 +979,11 @@ struct amdgpu_device {
bool pm_sysfs_en;
bool ucode_sysfs_en;
+
+ /* Chip product information */
+ char product_number[16];
+ char product_name[32];
+ char serial[16];
};
static inline struct amdgpu_device *amdgpu_ttm_adev(struct ttm_bo_device *bdev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 729565f79cfe..80a654326190 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>
@@ -137,6 +138,72 @@ 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
*
@@ -1977,6 +2044,8 @@ 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);
@@ -3188,6 +3257,24 @@ int amdgpu_device_init(struct amdgpu_device *adev,
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)
@@ -3270,6 +3357,9 @@ 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)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
new file mode 100644
index 000000000000..990dee6e22d5
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2019 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+#include "amdgpu.h"
+#include "amdgpu_i2c.h"
+#include "smu_v11_0_i2c.h"
+#include "atom.h"
+
+#define I2C_PRODUCT_INFO_ADDR 0xAC
+#define I2C_PRODUCT_INFO_ADDR_SIZE 0x2
+#define I2C_PRODUCT_INFO_OFFSET 0xC0
+
+int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr,
+ unsigned char *buff)
+{
+ int ret, size;
+ struct i2c_msg msg = {
+ .addr = I2C_PRODUCT_INFO_ADDR,
+ .flags = I2C_M_RD,
+ .buf = buff,
+ };
+ buff[0] = 0;
+ buff[1] = addrptr;
+ msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + 1;
+ ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1);
+
+ if (ret < 1) {
+ DRM_WARN("FRU: Failed to get size field");
+ return ret;
+ }
+
+ /* The size returned by the i2c requires subtraction of 0xC0 since the
+ * size apparently always reports as 0xC0+actual size.
+ */
+ size = buff[2] - I2C_PRODUCT_INFO_OFFSET;
+ /* Add 1 since address field was 1 byte */
+ buff[1] = addrptr + 1;
+
+ msg.len = I2C_PRODUCT_INFO_ADDR_SIZE + size;
+ ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1);
+
+ if (ret < 1) {
+ DRM_WARN("FRU: Failed to get data field");
+ return ret;
+ }
+
+ return size;
+}
+
+int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
+{
+ unsigned char buff[32];
+ int addrptr = 0, size = 0;
+
+ /* If algo exists, it means that the i2c_adapter's initialized */
+ if (!adev->pm.smu_i2c.algo) {
+ DRM_WARN("Cannot access FRU, EEPROM accessor not initialized");
+ return 0;
+ }
+
+ /* There's a lot of repetition here. This is due to the FRU having
+ * variable-length fields. To get the information, we have to find the
+ * size of each field, and then keep reading along and reading along
+ * until we get all of the data that we want. We use addrptr to track
+ * the address as we go
+ */
+
+ /* The first fields are all of size 1-byte, from 0-7 are offsets that
+ * contain information that isn't useful to us.
+ * Bytes 8-a are all 1-byte and refer to the size of the entire struct,
+ * and the language field, so just start from 0xb, manufacturer size
+ */
+ addrptr = 0xb;
+ size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+ if (size < 1) {
+ DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size);
+ return size;
+ }
+
+ /* Increment the addrptr by the size of the field, and 1 due to the
+ * size field being 1 byte. This pattern continues below.
+ */
+ addrptr += size + 1;
+ size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+ if (size < 1) {
+ DRM_ERROR("Failed to read FRU product name, ret:%d", size);
+ return size;
+ }
+
+ /* Start at 2 due to buff using fields 0 and 1 for the address */
+ memcpy(adev->product_name, &buff[2], size);
+ adev->product_name[size] = '\0';
+
+ addrptr += size + 1;
+ size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+ if (size < 1) {
+ DRM_ERROR("Failed to read FRU product number, ret:%d", size);
+ return size;
+ }
+
+ memcpy(adev->product_number, &buff[2], size);
+ adev->product_number[size] = '\0';
+
+ addrptr += size + 1;
+ size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+
+ if (size < 1) {
+ DRM_ERROR("Failed to read FRU product version, ret:%d", size);
+ return size;
+ }
+
+ addrptr += size + 1;
+ size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+
+ if (size < 1) {
+ DRM_ERROR("Failed to read FRU serial number, ret:%d", size);
+ return size;
+ }
+
+ memcpy(adev->serial, &buff[2], size);
+ adev->serial[size] = '\0';
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.h
new file mode 100644
index 000000000000..968115c97e33
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __AMDGPU_PRODINFO_H__
+#define __AMDGPU_PRODINFO_H__
+
+int amdgpu_fru_get_product_info(struct amdgpu_device *adev);
+
+#endif // __AMDGPU_PRODINFO_H__
--
2.17.1
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