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[10/11] PCI/TSM: Report active IDE streams

Message ID 173343745420.1074769.13008006909323222504.stgit@dwillia2-xfh.jf.intel.com (mailing list archive)
State New
Headers show
Series PCI/TSM: Core infrastructure for PCI device security (TDISP) | expand

Commit Message

Dan Williams Dec. 5, 2024, 10:24 p.m. UTC 
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@intel.com>
---
 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(+)

Comments

Bjorn Helgaas Dec. 10, 2024, 6:49 p.m. UTC | #1 
On Thu, Dec 05, 2024 at 02:24:14PM -0800, Dan Williams wrote:
> 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.

s/stream id/Stream ID/ to match spec usage as a proper noun

> +++ 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:DDDDD:BB:DD:F

Typical formatting of domain is %04x, including in existing sysfs
docs.
diff mbox series

Patch

diff --git a/Documentation/ABI/testing/sysfs-class-tsm b/Documentation/ABI/testing/sysfs-class-tsm
index 7503f04a9eb9..d6830f5f8628 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:DDDDD:BB:DD:F
+Date:		December, 2024
+Contact:	linux-pci@vger.kernel.org
+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:DDDDD 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 21270210b03f..d78a9faf507d 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;
@@ -100,6 +103,20 @@  void tsm_unregister(struct tsm_subsys *subsys)
 }
 EXPORT_SYMBOL_GPL(tsm_unregister);
 
+/* must be invoked between tsm_register / tsm_unregister */
+int tsm_register_ide_stream(struct pci_dev *pdev, struct pci_ide *ide)
+{
+	return sysfs_create_link(&tsm_subsys->dev.kobj, &pdev->dev.kobj,
+				 ide->name);
+}
+EXPORT_SYMBOL_GPL(tsm_register_ide_stream);
+
+void tsm_unregister_ide_stream(struct pci_ide *ide)
+{
+	sysfs_remove_link(&tsm_subsys->dev.kobj, ide->name);
+}
+EXPORT_SYMBOL_GPL(tsm_unregister_ide_stream);
+
 static void tsm_release(struct device *dev)
 {
 	struct tsm_subsys *subsys = container_of(dev, typeof(*subsys), dev);
diff --git a/include/linux/tsm.h b/include/linux/tsm.h
index 46b9a0c6ea4e..ce95e9130436 100644
--- a/include/linux/tsm.h
+++ b/include/linux/tsm.h
@@ -116,4 +116,8 @@  struct tsm_subsys *tsm_register(struct device *parent,
 				const struct attribute_group **groups,
 				const struct pci_tsm_ops *ops);
 void tsm_unregister(struct tsm_subsys *subsys);
+struct pci_dev;
+struct pci_ide;
+int tsm_register_ide_stream(struct pci_dev *pdev, struct pci_ide *ide);
+void tsm_unregister_ide_stream(struct pci_ide *ide);
 #endif /* __TSM_H */