Given that the platform TSM owns IDE Stream ID allocation, report the
active streams via the TSM class device. Establish a symlink from the
class device to the PCI endpoint device consuming the stream, named by
the Stream ID.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-class-tsm | 10 ++++++++++
drivers/virt/coco/host/tsm-core.c | 17 +++++++++++++++++
include/linux/tsm.h | 4 ++++
3 files changed, 31 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-tsm b/Documentation/ABI/testing/sysfs-class-tsm
index 7503f04a9eb9..75ee2b9bc555 100644
--- a/Documentation/ABI/testing/sysfs-class-tsm
+++ b/Documentation/ABI/testing/sysfs-class-tsm
@@ -8,3 +8,13 @@ Description:
signals when the PCI layer is able to support establishment of
link encryption and other device-security features coordinated
through the platform tsm.
+
+What: /sys/class/tsm/tsm0/streamN:DDDD:BB:DD:F
+Date: December, 2024
+Contact: linux-pci@xxxxxxxxxxxxxxx
+Description:
+ (RO) When a host bridge has established a secure connection via
+ the platform TSM, symlink appears. The primary function of this
+ is have a system global review of TSM resource consumption
+ across host bridges. The link points to the endpoint PCI device
+ at domain:DDDD bus:BB device:DD function:F.
diff --git a/drivers/virt/coco/host/tsm-core.c b/drivers/virt/coco/host/tsm-core.c
index 51146f226a64..bd9e09b07412 100644
--- a/drivers/virt/coco/host/tsm-core.c
+++ b/drivers/virt/coco/host/tsm-core.c
@@ -2,13 +2,16 @@
/* Copyright(c) 2024 Intel Corporation. All rights reserved. */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#define dev_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/tsm.h>
+#include <linux/pci.h>
#include <linux/rwsem.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/cleanup.h>
#include <linux/pci-tsm.h>
+#include <linux/pci-ide.h>
static DECLARE_RWSEM(tsm_core_rwsem);
static struct class *tsm_class;
@@ -99,6 +102,20 @@ void tsm_unregister(struct tsm_core_dev *core)
}
EXPORT_SYMBOL_GPL(tsm_unregister);
+/* must be invoked between tsm_register / tsm_unregister */
+int tsm_ide_stream_register(struct pci_dev *pdev, struct pci_ide *ide)
+{
+ return sysfs_create_link(&tsm_core->dev.kobj, &pdev->dev.kobj,
+ ide->name);
+}
+EXPORT_SYMBOL_GPL(tsm_ide_stream_register);
+
+void tsm_ide_stream_unregister(struct pci_ide *ide)
+{
+ sysfs_remove_link(&tsm_core->dev.kobj, ide->name);
+}
+EXPORT_SYMBOL_GPL(tsm_ide_stream_unregister);
+
static void tsm_release(struct device *dev)
{
struct tsm_core_dev *core = container_of(dev, typeof(*core), dev);
diff --git a/include/linux/tsm.h b/include/linux/tsm.h
index 59d3848404e1..915c4c8b061b 100644
--- a/include/linux/tsm.h
+++ b/include/linux/tsm.h
@@ -116,4 +116,8 @@ struct tsm_core_dev *tsm_register(struct device *parent,
const struct attribute_group **groups,
const struct pci_tsm_ops *ops);
void tsm_unregister(struct tsm_core_dev *tsm_core);
+struct pci_dev;
+struct pci_ide;
+int tsm_ide_stream_register(struct pci_dev *pdev, struct pci_ide *ide);
+void tsm_ide_stream_unregister(struct pci_ide *ide);
#endif /* __TSM_H */
--
2.49.0
