Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
PCI/TSM: Report active IDE streams
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.
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Link: https://patch.msgid.link/20251031212902.2256310-10-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
+47
+10
Documentation/ABI/testing/sysfs-class-tsm
+10
Documentation/ABI/testing/sysfs-class-tsm
···
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signals when the PCI layer is able to support establishment of
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link encryption and other device-security features coordinated
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through a platform tsm.
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What: /sys/class/tsm/tsmN/streamH.R.E
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Contact: linux-pci@vger.kernel.org
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Description:
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(RO) When a host bridge has established a secure connection via
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the platform TSM, symlink appears. The primary function of this
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is have a system global review of TSM resource consumption
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across host bridges. The link points to the endpoint PCI device
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and matches the same link published by the host bridge. See
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Documentation/ABI/testing/sysfs-devices-pci-host-bridge.
+4
drivers/pci/ide.c
+4
drivers/pci/ide.c
···
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#include <linux/pci_regs.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/tsm.h>
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#include "pci.h"
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···
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if (ide->partner[PCI_IDE_EP].enable)
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pci_ide_stream_disable(pdev, ide);
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if (ide->tsm_dev)
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tsm_ide_stream_unregister(ide);
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if (ide->partner[PCI_IDE_RP].setup)
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pci_ide_stream_teardown(rp, ide);
+28
drivers/virt/coco/tsm-core.c
+28
drivers/virt/coco/tsm-core.c
···
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/tsm.h>
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#include <linux/pci.h>
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#include <linux/rwsem.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/cleanup.h>
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#include <linux/pci-tsm.h>
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#include <linux/pci-ide.h>
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static struct class *tsm_class;
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static DECLARE_RWSEM(tsm_rwsem);
···
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device_unregister(&tsm_dev->dev);
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}
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EXPORT_SYMBOL_GPL(tsm_unregister);
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/* must be invoked between tsm_register / tsm_unregister */
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int tsm_ide_stream_register(struct pci_ide *ide)
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{
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struct pci_dev *pdev = ide->pdev;
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struct pci_tsm *tsm = pdev->tsm;
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struct tsm_dev *tsm_dev = tsm->tsm_dev;
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int rc;
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rc = sysfs_create_link(&tsm_dev->dev.kobj, &pdev->dev.kobj, ide->name);
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if (rc)
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return rc;
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ide->tsm_dev = tsm_dev;
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return 0;
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}
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EXPORT_SYMBOL_GPL(tsm_ide_stream_register);
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void tsm_ide_stream_unregister(struct pci_ide *ide)
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{
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struct tsm_dev *tsm_dev = ide->tsm_dev;
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ide->tsm_dev = NULL;
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sysfs_remove_link(&tsm_dev->dev.kobj, ide->name);
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}
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EXPORT_SYMBOL_GPL(tsm_ide_stream_unregister);
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static void tsm_release(struct device *dev)
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{
+2
include/linux/pci-ide.h
+2
include/linux/pci-ide.h
···
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* @host_bridge_stream: allocated from host bridge @ide_stream_ida pool
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* @stream_id: unique Stream ID (within Partner Port pairing)
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* @name: name of the established Selective IDE Stream in sysfs
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* @tsm_dev: For TSM established IDE, the TSM device context
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*
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* Negative @stream_id values indicate "uninitialized" on the
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* expectation that with TSM established IDE the TSM owns the stream_id
···
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u8 host_bridge_stream;
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int stream_id;
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const char *name;
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struct tsm_dev *tsm_dev;
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};
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void pci_ide_set_nr_streams(struct pci_host_bridge *hb, u16 nr);
+3
include/linux/tsm.h
+3
include/linux/tsm.h
···
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struct tsm_dev *tsm_register(struct device *parent, struct pci_tsm_ops *ops);
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void tsm_unregister(struct tsm_dev *tsm_dev);
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struct tsm_dev *find_tsm_dev(int id);
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struct pci_ide;
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int tsm_ide_stream_register(struct pci_ide *ide);
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void tsm_ide_stream_unregister(struct pci_ide *ide);
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#endif /* __TSM_H */