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PCI/TSM: Report active IDE streams

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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>
This commit is contained in:
Dan Williams
2025-10-31 14:29:01 -07:00
parent 9ddaf9c3ed
commit a4438f06b1
5 changed files with 47 additions and 0 deletions
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28
drivers/virt/coco/tsm-core.c
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@@ -4,11 +4,13 @@
#define pr_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 struct class *tsm_class;
static DECLARE_RWSEM(tsm_rwsem);
@@ -106,6 +108,32 @@ void tsm_unregister(struct tsm_dev *tsm_dev)
}
EXPORT_SYMBOL_GPL(tsm_unregister);
/* must be invoked between tsm_register / tsm_unregister */
int tsm_ide_stream_register(struct pci_ide *ide)
{
struct pci_dev *pdev = ide->pdev;
struct pci_tsm *tsm = pdev->tsm;
struct tsm_dev *tsm_dev = tsm->tsm_dev;
int rc;
rc = sysfs_create_link(&tsm_dev->dev.kobj, &pdev->dev.kobj, ide->name);
if (rc)
return rc;
ide->tsm_dev = tsm_dev;
return 0;
}
EXPORT_SYMBOL_GPL(tsm_ide_stream_register);
void tsm_ide_stream_unregister(struct pci_ide *ide)
{
struct tsm_dev *tsm_dev = ide->tsm_dev;
ide->tsm_dev = NULL;
sysfs_remove_link(&tsm_dev->dev.kobj, ide->name);
}
EXPORT_SYMBOL_GPL(tsm_ide_stream_unregister);
static void tsm_release(struct device *dev)
{
struct tsm_dev *tsm_dev = container_of(dev, typeof(*tsm_dev), dev);