Linux-USB Archive on lore.kernel.org
 help / color / Atom feed
From: Mario Limonciello <mario.limonciello@dell.com>
To: Andreas Noever <andreas.noever@gmail.com>,
	Michael Jamet <michael.jamet@intel.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Yehezkel Bernat <YehezkelShB@gmail.com>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	perry.yuan@dell.com,
	Mario Limonciello <mario.limonciello@dell.com>
Subject: [PATCH v3 1/2] thunderbolt: Add support for separating the flush to SPI and authenticate
Date: Tue, 23 Jun 2020 11:14:28 -0500
Message-ID: <20200623161429.24214-2-mario.limonciello@dell.com> (raw)
In-Reply-To: <20200623161429.24214-1-mario.limonciello@dell.com>

This allows userspace to have a shorter period of time that the device
is unusable and to call it at a more convenient time.

For example flushing the image may happen while the user is using the
machine and authenticating/rebooting may happen while logging out.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
---
 .../ABI/testing/sysfs-bus-thunderbolt         | 11 ++++-
 drivers/thunderbolt/nvm.c                     |  1 +
 drivers/thunderbolt/switch.c                  | 42 ++++++++++++-------
 drivers/thunderbolt/tb.h                      |  2 +
 4 files changed, 39 insertions(+), 17 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-thunderbolt b/Documentation/ABI/testing/sysfs-bus-thunderbolt
index bd504ed323e8..7d0500b4d58a 100644
--- a/Documentation/ABI/testing/sysfs-bus-thunderbolt
+++ b/Documentation/ABI/testing/sysfs-bus-thunderbolt
@@ -178,11 +178,18 @@ KernelVersion:	4.13
 Contact:	thunderbolt-software@lists.01.org
 Description:	When new NVM image is written to the non-active NVM
 		area (through non_activeX NVMem device), the
-		authentication procedure is started by writing 1 to
-		this file. If everything goes well, the device is
+		authentication procedure is started by writing to
+		this file.
+		If everything goes well, the device is
 		restarted with the new NVM firmware. If the image
 		verification fails an error code is returned instead.
 
+		This file will accept writing values "1" or "2"
+		- Writing "1" will flush the image to the storage
+		area and authenticate the image in one action.
+		- Writing "2" will run some basic validation on the image
+		and flush it to the storage area.
+
 		When read holds status of the last authentication
 		operation if an error occurred during the process. This
 		is directly the status value from the DMA configuration
diff --git a/drivers/thunderbolt/nvm.c b/drivers/thunderbolt/nvm.c
index 4c6aa06ab3d5..29de6d95c6e7 100644
--- a/drivers/thunderbolt/nvm.c
+++ b/drivers/thunderbolt/nvm.c
@@ -100,6 +100,7 @@ int tb_nvm_write_buf(struct tb_nvm *nvm, unsigned int offset, void *val,
 			return -ENOMEM;
 	}
 
+	nvm->flushed = false;
 	nvm->buf_data_size = offset + bytes;
 	memcpy(nvm->buf + offset, val, bytes);
 	return 0;
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 817c66c7adcf..bbfbfebeee7f 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -26,6 +26,11 @@ struct nvm_auth_status {
 	u32 status;
 };
 
+enum nvm_write_ops {
+	WRITE_AND_AUTHENTICATE = 1,
+	WRITE_ONLY = 2,
+};
+
 /*
  * Hold NVM authentication failure status per switch This information
  * needs to stay around even when the switch gets power cycled so we
@@ -155,8 +160,12 @@ static int nvm_validate_and_write(struct tb_switch *sw)
 	}
 
 	if (tb_switch_is_usb4(sw))
-		return usb4_switch_nvm_write(sw, 0, buf, image_size);
-	return dma_port_flash_write(sw->dma_port, 0, buf, image_size);
+		ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
+	else
+		ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
+	if (!ret)
+		sw->nvm->flushed = true;
+	return ret;
 }
 
 static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
@@ -1488,7 +1497,7 @@ static ssize_t nvm_authenticate_store(struct device *dev,
 	struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct tb_switch *sw = tb_to_switch(dev);
-	bool val;
+	int val;
 	int ret;
 
 	pm_runtime_get_sync(&sw->dev);
@@ -1504,25 +1513,28 @@ static ssize_t nvm_authenticate_store(struct device *dev,
 		goto exit_unlock;
 	}
 
-	ret = kstrtobool(buf, &val);
+	ret = kstrtoint(buf, 10, &val);
 	if (ret)
 		goto exit_unlock;
 
 	/* Always clear the authentication status */
 	nvm_clear_auth_status(sw);
 
-	if (val) {
-		if (!sw->nvm->buf) {
-			ret = -EINVAL;
-			goto exit_unlock;
-		}
-
-		ret = nvm_validate_and_write(sw);
-		if (ret)
-			goto exit_unlock;
+	if (val > 0) {
+		if (!sw->nvm->flushed) {
+			if (!sw->nvm->buf) {
+				ret = -EINVAL;
+				goto exit_unlock;
+			}
 
-		sw->nvm->authenticating = true;
-		ret = nvm_authenticate(sw);
+			ret = nvm_validate_and_write(sw);
+			if (ret || val == WRITE_ONLY)
+				goto exit_unlock;
+		}
+		if (val == WRITE_AND_AUTHENTICATE) {
+			sw->nvm->authenticating = true;
+			ret = nvm_authenticate(sw);
+		}
 	}
 
 exit_unlock:
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 736d1589c31e..b04a2da9128b 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -39,6 +39,7 @@
  * @buf_data_size: Number of bytes actually consumed by the new NVM
  *		   image
  * @authenticating: The device is authenticating the new NVM
+ * @flushed: The image has been flushed to the storage area
  *
  * The user of this structure needs to handle serialization of possible
  * concurrent access.
@@ -53,6 +54,7 @@ struct tb_nvm {
 	void *buf;
 	size_t buf_data_size;
 	bool authenticating;
+	bool flushed;
 };
 
 #define TB_SWITCH_KEY_SIZE		32
-- 
2.25.1


  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-23 16:14 [PATCH v3 0/2] Allow breaking up Thunderbolt/USB4 updates Mario Limonciello
2020-06-23 16:14 ` Mario Limonciello [this message]
2020-06-23 16:14 ` [PATCH v3 2/2] thunderbolt: Add support for authenticate on disconnect Mario Limonciello
2020-07-01 10:55 ` [PATCH v3 0/2] Allow breaking up Thunderbolt/USB4 updates Mika Westerberg

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200623161429.24214-2-mario.limonciello@dell.com \
    --to=mario.limonciello@dell.com \
    --cc=YehezkelShB@gmail.com \
    --cc=andreas.noever@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=michael.jamet@intel.com \
    --cc=mika.westerberg@linux.intel.com \
    --cc=perry.yuan@dell.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-USB Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-usb/0 linux-usb/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-usb linux-usb/ https://lore.kernel.org/linux-usb \
		linux-usb@vger.kernel.org
	public-inbox-index linux-usb

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-usb


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git