diff options
| author | Davidlohr Bueso <dave@stgolabs.net> | 2023-06-12 21:10:35 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2023-06-26 01:21:16 +0300 |
| commit | 48dcdbb16e5dc0947f949ce17bc2d09a625a0d5c (patch) | |
| tree | 2efe734b220cec7d3122913813509f199ef0ccdd /drivers/cxl/pci.c | |
| parent | 0c36b6ad436a38b167af16e6c690c890b8b2df62 (diff) | |
| download | linux-48dcdbb16e5dc0947f949ce17bc2d09a625a0d5c.tar.xz | |
cxl/mem: Wire up Sanitization support
Implement support for CXL 3.0 8.2.9.8.5.1 Sanitize. This is done by
adding a security/sanitize' memdev sysfs file to trigger the operation
and extend the status file to make it poll(2)-capable for completion.
Unlike all other background commands, this is the only operation that
is special and monopolizes the device for long periods of time.
In addition to the traditional pmem security requirements, all regions
must also be offline in order to perform the operation. This permits
avoiding explicit global CPU cache management, relying instead on the
implict cache management when a region transitions between
CXL_CONFIG_ACTIVE and CXL_CONFIG_COMMIT.
The expectation is that userspace can use it such as:
cxl disable-memdev memX
echo 1 > /sys/bus/cxl/devices/memX/security/sanitize
cxl wait-sanitize memX
cxl enable-memdev memX
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Link: https://lore.kernel.org/r/20230612181038.14421-5-dave@stgolabs.net
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/pci.c')
| -rw-r--r-- | drivers/cxl/pci.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 8f1309577653..8bc19cae0850 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -126,6 +126,9 @@ static irqreturn_t cxl_pci_mbox_irq(int irq, void *id) reg = readq(cxlds->regs.mbox + CXLDEV_MBOX_BG_CMD_STATUS_OFFSET); opcode = FIELD_GET(CXLDEV_MBOX_BG_CMD_COMMAND_OPCODE_MASK, reg); if (opcode == CXL_MBOX_OP_SANITIZE) { + if (cxlds->security.sanitize_node) + sysfs_notify_dirent(cxlds->security.sanitize_node); + dev_dbg(cxlds->dev, "Sanitization operation ended\n"); } else { /* short-circuit the wait in __cxl_pci_mbox_send_cmd() */ @@ -150,6 +153,9 @@ static void cxl_mbox_sanitize_work(struct work_struct *work) cxlds->security.poll_tmo_secs = 0; put_device(cxlds->dev); + if (cxlds->security.sanitize_node) + sysfs_notify_dirent(cxlds->security.sanitize_node); + dev_dbg(cxlds->dev, "Sanitization operation ended\n"); } else { int timeout = cxlds->security.poll_tmo_secs + 10; |