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Subject[PATCH v1 5/8] firmware_loader: Add sysfs nodes to monitor fw_upload
Date
Add additional sysfs nodes to monitor the transfer of firmware upload data
to the target device:

cancel: Write 1 to cancel the data transfer
error: Display error status for a failed firmware upload
remaining_size: Display the remaining amount of data to be transferred
status: Display the progress of the firmware upload

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
---
v1:
- Adapted to enums and filename changes. Otherwise no changes.
---
.../ABI/testing/sysfs-class-firmware | 45 +++++++
.../driver-api/firmware/fw_upload.rst | 19 ++-
drivers/base/firmware_loader/sysfs.c | 9 ++
drivers/base/firmware_loader/sysfs_upload.c | 121 ++++++++++++++++++
drivers/base/firmware_loader/sysfs_upload.h | 5 +
5 files changed, 198 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-class-firmware b/Documentation/ABI/testing/sysfs-class-firmware
index a2e518f0bf8a..5653cb2d6e23 100644
--- a/Documentation/ABI/testing/sysfs-class-firmware
+++ b/Documentation/ABI/testing/sysfs-class-firmware
@@ -10,6 +10,30 @@ Description: The data sysfs file is used for firmware-fallback and for
signal the lower-level driver that the firmware data is
available.

+What: /sys/class/firmware/.../cancel
+Date: Mar 2022
+KernelVersion: 5.18
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Write-only. For firmware uploads, write a "1" to this file to
+ request that the transfer of firmware data to the lower-level
+ device be canceled. This request will be rejected (EBUSY) if
+ the update cannot be canceled (e.g. a FLASH write is in
+ progress) or (ENODEV) if there is no firmware update in progress.
+
+What: /sys/class/firmware/.../error
+Date: Mar 2022
+KernelVersion: 5.18
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Read-only. Returns a string describing a failed firmware
+ upload. This string will be in the form of <STATUS>:<ERROR>,
+ where <STATUS> will be one of the status strings described
+ for the status sysfs file and <ERROR> will be one of the
+ following: "hw-error", "timeout", "user-abort", "device-busy",
+ "invalid-file-size", "read-write-error", "flash-wearout". The
+ error sysfs file is only meaningful when the current firmware
+ upload status is "idle". If this file is read while a firmware
+ transfer is in progress, then the read will fail with EBUSY.
+
What: /sys/class/firmware/.../loading
Date: Mar 2022
KernelVersion: 5.18
@@ -22,6 +46,27 @@ Description: The loading sysfs file is used for both firmware-fallback and
uploads, the zero value also triggers the transfer of the
firmware data to the lower-level device driver.

+What: /sys/class/firmware/.../remaining_size
+Date: Mar 2022
+KernelVersion: 5.18
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Read-only. For firmware upload, this file contains the size
+ of the firmware data that remains to be transferred to the
+ lower-level device driver. The size value is initialized to
+ the full size of the firmware image that was previously
+ written to the data sysfs file. This value is periodically
+ updated during the "transferring" phase of the firmware
+ upload.
+ Format: "%u".
+
+What: /sys/class/firmware/.../status
+Date: Mar 2022
+KernelVersion: 5.18
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Read-only. Returns a string describing the current status of
+ a firmware upload. The string will be one of the following:
+ idle, "receiving", "preparing", "transferring", "programming".
+
What: /sys/class/firmware/.../timeout
Date: Mar 2022
KernelVersion: 5.18
diff --git a/Documentation/driver-api/firmware/fw_upload.rst b/Documentation/driver-api/firmware/fw_upload.rst
index 2aaac9c70e41..00c8e19d99b7 100644
--- a/Documentation/driver-api/firmware/fw_upload.rst
+++ b/Documentation/driver-api/firmware/fw_upload.rst
@@ -9,7 +9,8 @@ persistent sysfs nodes to enable users to initiate firmware updates for
that device. It is the responsibility of the device driver and/or the
device itself to perform any validation on the data received. Firmware
upload uses the same *loading* and *data* sysfs files described in the
-documentation for firmware fallback.
+documentation for firmware fallback. It also adds additional sysfs files
+to provide status on the transfer of the firmware image to the device.

Register for firmware upload
============================
@@ -98,3 +99,19 @@ failure:

.. kernel-doc:: include/linux/firmware.h
:identifiers: fw_upload_err
+
+Sysfs Attributes
+================
+
+In addition to the *loading* and *data* sysfs files, there are additional
+sysfs files to monitor the status of the data transfer to the target
+device and to determine the final pass/fail status of the transfer.
+Depending on the device and the size of the firmware image, a firmware
+update could take milliseconds or minutes.
+
+The additional sysfs files are:
+
+* status - provides an indication of the progress of a firmware update
+* error - provides error information for a failed firmware update
+* remaining_size - tracks the data transfer portion of an update
+* cancel - echo 1 to this file to cancel the update
diff --git a/drivers/base/firmware_loader/sysfs.c b/drivers/base/firmware_loader/sysfs.c
index 4beb0685d90a..dbfb61e144be 100644
--- a/drivers/base/firmware_loader/sysfs.c
+++ b/drivers/base/firmware_loader/sysfs.c
@@ -381,6 +381,12 @@ static struct bin_attribute firmware_attr_data = {

static struct attribute *fw_dev_attrs[] = {
&dev_attr_loading.attr,
+#ifdef CONFIG_FW_UPLOAD
+ &dev_attr_cancel.attr,
+ &dev_attr_status.attr,
+ &dev_attr_error.attr,
+ &dev_attr_remaining_size.attr,
+#endif
NULL
};

@@ -392,6 +398,9 @@ static struct bin_attribute *fw_dev_bin_attrs[] = {
static const struct attribute_group fw_dev_attr_group = {
.attrs = fw_dev_attrs,
.bin_attrs = fw_dev_bin_attrs,
+#ifdef CONFIG_FW_UPLOAD
+ .is_visible = fw_upload_is_visible,
+#endif
};

static const struct attribute_group *fw_dev_attr_groups[] = {
diff --git a/drivers/base/firmware_loader/sysfs_upload.c b/drivers/base/firmware_loader/sysfs_upload.c
index 4c24f50d57e0..0b308fff65a9 100644
--- a/drivers/base/firmware_loader/sysfs_upload.c
+++ b/drivers/base/firmware_loader/sysfs_upload.c
@@ -11,6 +11,127 @@
* Support for user-space to initiate a firmware upload to a device.
*/

+static const char * const fw_upload_prog_str[] = {
+ [FW_UPLOAD_PROG_IDLE] = "idle",
+ [FW_UPLOAD_PROG_RECEIVING] = "receiving",
+ [FW_UPLOAD_PROG_PREPARING] = "preparing",
+ [FW_UPLOAD_PROG_TRANSFERRING] = "transferring",
+ [FW_UPLOAD_PROG_PROGRAMMING] = "programming"
+};
+
+static const char * const fw_upload_err_str[] = {
+ [FW_UPLOAD_ERR_NONE] = "none",
+ [FW_UPLOAD_ERR_HW_ERROR] = "hw-error",
+ [FW_UPLOAD_ERR_TIMEOUT] = "timeout",
+ [FW_UPLOAD_ERR_CANCELED] = "user-abort",
+ [FW_UPLOAD_ERR_BUSY] = "device-busy",
+ [FW_UPLOAD_ERR_INVALID_SIZE] = "invalid-file-size",
+ [FW_UPLOAD_ERR_RW_ERROR] = "read-write-error",
+ [FW_UPLOAD_ERR_WEAROUT] = "flash-wearout",
+};
+
+static const char *fw_upload_progress(struct device *dev,
+ enum fw_upload_prog prog)
+{
+ const char *status = "unknown-status";
+
+ if (prog < FW_UPLOAD_PROG_MAX)
+ status = fw_upload_prog_str[prog];
+ else
+ dev_err(dev, "Invalid status during secure update: %d\n", prog);
+
+ return status;
+}
+
+static const char *fw_upload_error(struct device *dev,
+ enum fw_upload_err err_code)
+{
+ const char *error = "unknown-error";
+
+ if (err_code < FW_UPLOAD_ERR_MAX)
+ error = fw_upload_err_str[err_code];
+ else
+ dev_err(dev, "Invalid error code during secure update: %d\n",
+ err_code);
+
+ return error;
+}
+
+static ssize_t
+status_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct fw_upload_priv *fwlp = to_fw_sysfs(dev)->fw_upload_priv;
+
+ return sysfs_emit(buf, "%s\n", fw_upload_progress(dev, fwlp->progress));
+}
+DEVICE_ATTR_RO(status);
+
+static ssize_t
+error_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct fw_upload_priv *fwlp = to_fw_sysfs(dev)->fw_upload_priv;
+ int ret;
+
+ mutex_lock(&fwlp->lock);
+
+ if (fwlp->progress != FW_UPLOAD_PROG_IDLE)
+ ret = -EBUSY;
+ else if (!fwlp->err_code)
+ ret = 0;
+ else
+ ret = sysfs_emit(buf, "%s:%s\n",
+ fw_upload_progress(dev, fwlp->err_progress),
+ fw_upload_error(dev, fwlp->err_code));
+
+ mutex_unlock(&fwlp->lock);
+
+ return ret;
+}
+DEVICE_ATTR_RO(error);
+
+static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fw_upload_priv *fwlp = to_fw_sysfs(dev)->fw_upload_priv;
+ int ret = count;
+ bool cancel;
+
+ if (kstrtobool(buf, &cancel) || !cancel)
+ return -EINVAL;
+
+ mutex_lock(&fwlp->lock);
+ if (fwlp->progress == FW_UPLOAD_PROG_IDLE)
+ ret = -ENODEV;
+
+ fwlp->ops->cancel(fwlp->fw_upload);
+ mutex_unlock(&fwlp->lock);
+
+ return ret;
+}
+DEVICE_ATTR_WO(cancel);
+
+static ssize_t remaining_size_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fw_upload_priv *fwlp = to_fw_sysfs(dev)->fw_upload_priv;
+
+ return sysfs_emit(buf, "%u\n", fwlp->remaining_size);
+}
+DEVICE_ATTR_RO(remaining_size);
+
+umode_t
+fw_upload_is_visible(struct kobject *kobj, struct attribute *attr, int n)
+{
+ static struct fw_sysfs *fw_sysfs;
+
+ fw_sysfs = to_fw_sysfs(kobj_to_dev(kobj));
+
+ if (fw_sysfs->fw_upload_priv || attr == &dev_attr_loading.attr)
+ return attr->mode;
+
+ return 0;
+}
+
static void fw_upload_update_progress(struct fw_upload_priv *fwlp,
enum fw_upload_prog new_progress)
{
diff --git a/drivers/base/firmware_loader/sysfs_upload.h b/drivers/base/firmware_loader/sysfs_upload.h
index ca923265c62c..9afb1cfbc6f6 100644
--- a/drivers/base/firmware_loader/sysfs_upload.h
+++ b/drivers/base/firmware_loader/sysfs_upload.h
@@ -30,6 +30,11 @@ struct fw_upload_priv {
};

#ifdef CONFIG_FW_UPLOAD
+extern struct device_attribute dev_attr_status;
+extern struct device_attribute dev_attr_error;
+extern struct device_attribute dev_attr_cancel;
+extern struct device_attribute dev_attr_remaining_size;
+
int fw_upload_start(struct fw_sysfs *fw_sysfs);
umode_t fw_upload_is_visible(struct kobject *kobj, struct attribute *attr, int n);
#else
--
2.25.1
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