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From: Russ Weight <russell.h.weight@intel.com>
To: mdf@kernel.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: trix@redhat.com, lgoncalv@redhat.com, yilun.xu@intel.com,
	hao.wu@intel.com, matthew.gerlach@intel.com,
	Russ Weight <russell.h.weight@intel.com>
Subject: [PATCH v7 3/7] fpga: sec-mgr: expose sec-mgr update status
Date: Thu,  3 Dec 2020 13:09:54 -0800	[thread overview]
Message-ID: <20201203210958.241329-4-russell.h.weight@intel.com> (raw)
In-Reply-To: <20201203210958.241329-1-russell.h.weight@intel.com>

Extend the FPGA Security Manager class driver to
include an update/status sysfs node that can be polled
and read to monitor the progress of an ongoing secure
update. Sysfs_notify() is used to signal transitions
between different phases of the update process.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Reviewed-by: Tom Rix <trix@redhat.com>
---
v7:
  - Changed Date in documentation file to December 2020
v6:
  - No change
v5:
  - Use new function sysfs_emit() in the status_show() function
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:
  - Use a local variable to read progress once in status_show()
  - Use dev_err to report invalid progress status
v2:
  - Bumped documentation date and version
  - Changed progress state "read_file" to "reading"
---
 .../ABI/testing/sysfs-class-fpga-sec-mgr      | 11 +++++
 drivers/fpga/fpga-sec-mgr.c                   | 42 +++++++++++++++++--
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
index e9334f986380..d3be25d63a08 100644
--- a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
+++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr
@@ -16,3 +16,14 @@ Description:	Write only. Write the filename of an image
 		BMC images, BMC firmware, Static Region images,
 		and Root Entry Hashes, and to cancel Code Signing
 		Keys (CSK).
+
+What: 		/sys/class/fpga_sec_mgr/fpga_secX/update/status
+Date:		December 2020
+KernelVersion:  5.11
+Contact:	Russ Weight <russell.h.weight@intel.com>
+Description:	Read-only. Returns a string describing the current
+		status of an update. The string will be one of the
+		following: idle, reading, preparing, writing,
+		programming. Userspace code can poll on this file,
+		as it will be signaled by sysfs_notify() on each
+		state change.
diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c
index 7347ba1ba73e..dd60014b7511 100644
--- a/drivers/fpga/fpga-sec-mgr.c
+++ b/drivers/fpga/fpga-sec-mgr.c
@@ -25,6 +25,13 @@ struct fpga_sec_mgr_devres {
 
 #define to_sec_mgr(d) container_of(d, struct fpga_sec_mgr, dev)
 
+static void update_progress(struct fpga_sec_mgr *smgr,
+			    enum fpga_sec_prog new_progress)
+{
+	smgr->progress = new_progress;
+	sysfs_notify(&smgr->dev.kobj, "update", "status");
+}
+
 static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr,
 			       enum fpga_sec_err err_code)
 {
@@ -35,7 +42,7 @@ static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr,
 static void progress_complete(struct fpga_sec_mgr *smgr)
 {
 	mutex_lock(&smgr->lock);
-	smgr->progress = FPGA_SEC_PROG_IDLE;
+	update_progress(smgr, FPGA_SEC_PROG_IDLE);
 	complete_all(&smgr->update_done);
 	mutex_unlock(&smgr->lock);
 }
@@ -63,14 +70,14 @@ static void fpga_sec_mgr_update(struct work_struct *work)
 		goto release_fw_exit;
 	}
 
-	smgr->progress = FPGA_SEC_PROG_PREPARING;
+	update_progress(smgr, FPGA_SEC_PROG_PREPARING);
 	ret = smgr->sops->prepare(smgr);
 	if (ret != FPGA_SEC_ERR_NONE) {
 		fpga_sec_dev_error(smgr, ret);
 		goto modput_exit;
 	}
 
-	smgr->progress = FPGA_SEC_PROG_WRITING;
+	update_progress(smgr, FPGA_SEC_PROG_WRITING);
 	size = smgr->remaining_size;
 	while (size) {
 		blk_size = min_t(u32, size, WRITE_BLOCK_SIZE);
@@ -85,7 +92,7 @@ static void fpga_sec_mgr_update(struct work_struct *work)
 		offset += blk_size;
 	}
 
-	smgr->progress = FPGA_SEC_PROG_PROGRAMMING;
+	update_progress(smgr, FPGA_SEC_PROG_PROGRAMMING);
 	ret = smgr->sops->poll_complete(smgr);
 	if (ret != FPGA_SEC_ERR_NONE)
 		fpga_sec_dev_error(smgr, ret);
@@ -113,6 +120,32 @@ static void fpga_sec_mgr_update(struct work_struct *work)
 	progress_complete(smgr);
 }
 
+static const char * const sec_mgr_prog_str[] = {
+	"idle",			/* FPGA_SEC_PROG_IDLE */
+	"reading",		/* FPGA_SEC_PROG_READING */
+	"preparing",		/* FPGA_SEC_PROG_PREPARING */
+	"writing",		/* FPGA_SEC_PROG_WRITING */
+	"programming"		/* FPGA_SEC_PROG_PROGRAMMING */
+};
+
+static ssize_t
+status_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct fpga_sec_mgr *smgr = to_sec_mgr(dev);
+	const char *status = "unknown-status";
+	enum fpga_sec_prog progress;
+
+	progress = smgr->progress;
+	if (progress < FPGA_SEC_PROG_MAX)
+		status = sec_mgr_prog_str[progress];
+	else
+		dev_err(dev, "Invalid status during secure update: %d\n",
+			progress);
+
+	return sysfs_emit(buf, "%s\n", status);
+}
+static DEVICE_ATTR_RO(status);
+
 static ssize_t filename_store(struct device *dev, struct device_attribute *attr,
 			      const char *buf, size_t count)
 {
@@ -147,6 +180,7 @@ static DEVICE_ATTR_WO(filename);
 
 static struct attribute *sec_mgr_update_attrs[] = {
 	&dev_attr_filename.attr,
+	&dev_attr_status.attr,
 	NULL,
 };
 
-- 
2.25.1


  parent reply	other threads:[~2020-12-03 21:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-03 21:09 [PATCH v7 0/7] FPGA Security Manager Class Driver Russ Weight
2020-12-03 21:09 ` [PATCH v7 1/7] fpga: sec-mgr: fpga security manager class driver Russ Weight
2020-12-04 19:45   ` Randy Dunlap
2020-12-07 18:09     ` Russ Weight
2020-12-03 21:09 ` [PATCH v7 2/7] fpga: sec-mgr: enable secure updates Russ Weight
2020-12-03 21:09 ` Russ Weight [this message]
2020-12-03 21:09 ` [PATCH v7 4/7] fpga: sec-mgr: expose sec-mgr update errors Russ Weight
2020-12-03 21:09 ` [PATCH v7 5/7] fpga: sec-mgr: expose sec-mgr update size Russ Weight
2020-12-03 21:09 ` [PATCH v7 6/7] fpga: sec-mgr: enable cancel of secure update Russ Weight
2020-12-03 21:09 ` [PATCH v7 7/7] fpga: sec-mgr: expose hardware error info Russ Weight

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