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Subject[PATCH v6 6/7] fpga: sec-mgr: enable cancel of secure update
Date
Extend the FPGA Security Manager class driver to include
an update/cancel sysfs file that can be written to request
that an update be canceled. The write may return EBUSY if
the update has progressed to the point that it cannot be
canceled by software or ENODEV if there is no update in
progress.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
---
v6:
- No change
v5:
- No change
v4:
- Changed from "Intel FPGA Security Manager" to FPGA Security Manager"
and removed unnecessary references to "Intel".
- Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_
v3:
- No change
v2:
- Bumped documentation date and version
- Minor code cleanup per review comments
---
.../ABI/testing/sysfs-class-fpga-sec-mgr | 10 ++++
drivers/fpga/fpga-sec-mgr.c | 59 +++++++++++++++++--
include/linux/fpga/fpga-sec-mgr.h | 1 +
3 files changed, 66 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
index 848b830c5db6..93e634bc695f 100644
--- a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
+++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
@@ -17,6 +17,16 @@ Description: Write only. Write the filename of an image
and Root Entry Hashes, and to cancel Code Signing
Keys (CSK).

+What: /sys/class/fpga_sec_mgr/fpga_secX/update/cancel
+Date: Oct 2020
+KernelVersion: 5.11
+Contact: Russ Weight <russell.h.weight@intel.com>
+Description: Write-only. Write a "1" to this file to request
+ that a current update be canceled. This request
+ will be rejected (EBUSY) if the programming phase
+ has already started or (ENODEV) if there is no
+ update in progress.
+
What: /sys/class/fpga_sec_mgr/fpga_secX/update/status
Date: Oct 2020
KernelVersion: 5.11
diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c
index 62633e75ba53..cf78fec6dd19 100644
--- a/drivers/fpga/fpga-sec-mgr.c
+++ b/drivers/fpga/fpga-sec-mgr.c
@@ -45,6 +45,23 @@ static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr,
smgr->sops->cancel(smgr);
}

+static int progress_transition(struct fpga_sec_mgr *smgr,
+ enum fpga_sec_prog new_progress)
+{
+ int ret = 0;
+
+ mutex_lock(&smgr->lock);
+ if (smgr->request_cancel) {
+ set_error(smgr, FPGA_SEC_ERR_CANCELED);
+ smgr->sops->cancel(smgr);
+ ret = -ECANCELED;
+ } else {
+ update_progress(smgr, new_progress);
+ }
+ mutex_unlock(&smgr->lock);
+ return ret;
+}
+
static void progress_complete(struct fpga_sec_mgr *smgr)
{
mutex_lock(&smgr->lock);
@@ -76,16 +93,20 @@ static void fpga_sec_mgr_update(struct work_struct *work)
goto release_fw_exit;
}

- update_progress(smgr, FPGA_SEC_PROG_PREPARING);
+ if (progress_transition(smgr, FPGA_SEC_PROG_PREPARING))
+ goto modput_exit;
+
ret = smgr->sops->prepare(smgr);
if (ret != FPGA_SEC_ERR_NONE) {
fpga_sec_dev_error(smgr, ret);
goto modput_exit;
}

- update_progress(smgr, FPGA_SEC_PROG_WRITING);
+ if (progress_transition(smgr, FPGA_SEC_PROG_WRITING))
+ goto done;
+
size = smgr->remaining_size;
- while (size) {
+ while (size && !smgr->request_cancel) {
blk_size = min_t(u32, size, WRITE_BLOCK_SIZE);
size -= blk_size;
ret = smgr->sops->write_blk(smgr, offset, blk_size);
@@ -98,7 +119,9 @@ static void fpga_sec_mgr_update(struct work_struct *work)
offset += blk_size;
}

- update_progress(smgr, FPGA_SEC_PROG_PROGRAMMING);
+ if (progress_transition(smgr, FPGA_SEC_PROG_PROGRAMMING))
+ goto done;
+
ret = smgr->sops->poll_complete(smgr);
if (ret != FPGA_SEC_ERR_NONE)
fpga_sec_dev_error(smgr, ret);
@@ -235,6 +258,7 @@ static ssize_t filename_store(struct device *dev, struct device_attribute *attr,
}

smgr->err_code = FPGA_SEC_ERR_NONE;
+ smgr->request_cancel = false;
smgr->progress = FPGA_SEC_PROG_READING;
reinit_completion(&smgr->update_done);
schedule_work(&smgr->work);
@@ -245,8 +269,32 @@ static ssize_t filename_store(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_WO(filename);

+static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fpga_sec_mgr *smgr = to_sec_mgr(dev);
+ bool cancel;
+ int ret = count;
+
+ if (kstrtobool(buf, &cancel) || !cancel)
+ return -EINVAL;
+
+ mutex_lock(&smgr->lock);
+ if (smgr->progress == FPGA_SEC_PROG_PROGRAMMING)
+ ret = -EBUSY;
+ else if (smgr->progress == FPGA_SEC_PROG_IDLE)
+ ret = -ENODEV;
+ else
+ smgr->request_cancel = true;
+ mutex_unlock(&smgr->lock);
+
+ return ret;
+}
+static DEVICE_ATTR_WO(cancel);
+
static struct attribute *sec_mgr_update_attrs[] = {
&dev_attr_filename.attr,
+ &dev_attr_cancel.attr,
&dev_attr_status.attr,
&dev_attr_error.attr,
&dev_attr_remaining_size.attr,
@@ -468,6 +516,9 @@ void fpga_sec_mgr_unregister(struct fpga_sec_mgr *smgr)
goto unregister;
}

+ if (smgr->progress != FPGA_SEC_PROG_PROGRAMMING)
+ smgr->request_cancel = true;
+
mutex_unlock(&smgr->lock);
wait_for_completion(&smgr->update_done);

diff --git a/include/linux/fpga/fpga-sec-mgr.h b/include/linux/fpga/fpga-sec-mgr.h
index 78f8dc51a508..e63e6437f394 100644
--- a/include/linux/fpga/fpga-sec-mgr.h
+++ b/include/linux/fpga/fpga-sec-mgr.h
@@ -73,6 +73,7 @@ struct fpga_sec_mgr {
enum fpga_sec_prog progress;
enum fpga_sec_prog err_state; /* progress state at time of failure */
enum fpga_sec_err err_code; /* security manager error code */
+ bool request_cancel;
bool driver_unload;
void *priv;
};
--
2.25.1
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