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| author | Li Ming <ming.li@zohomail.com> | 2026-04-01 15:49:51 +0300 |
|---|---|---|
| committer | Dave Jiang <dave.jiang@intel.com> | 2026-04-01 19:59:58 +0300 |
| commit | d585bc86fb9f405ed1f2f56cc50c82d9aaada297 (patch) | |
| tree | b8801abf540238b1090cd1536e405d71c883199c /drivers | |
| parent | 261a02b93d9b6dfdc49b3e675be1a0e677cf71f3 (diff) | |
| download | linux-d585bc86fb9f405ed1f2f56cc50c82d9aaada297.tar.xz | |
cxl/region: Add a region sysfs interface for region lock status
There are 3 scenarios that leads to a locked region:
1. A region is created on a root decoder with Fixed Device Confiuration
attribute.
2. CXL_HDM_DECODER0_CTRL_LOCK.
Both 1 & 1 are well described in:
commit 2230c4bdc412 ("cxl: Add handling of locked CXL decoder")
3) Platform that has region creation with PRMT address translation always
locks the region, regardless of the FIXED attribute or decoder ctrl bit.
Region locked means region destroy operations are not permitted. CXL
region driver returns -EPERM for region destroy operations.
Although the locked status of the corresponding root decoder implies the
region is also locked, exposing the region lock status directly to
userspace improves usability for users who may not be aware of this
relationship.
[ dj: Amended commit log with additional locking scenarios. ]
Signed-off-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alejandro Lucero <alucerop@amd.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20260401124951.1290041-1-ming.li@zohomail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cxl/core/region.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 42874948b589..95d81816008e 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -767,6 +767,22 @@ static ssize_t extended_linear_cache_size_show(struct device *dev, } static DEVICE_ATTR_RO(extended_linear_cache_size); +static ssize_t locked_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct cxl_region *cxlr = to_cxl_region(dev); + int rc; + + ACQUIRE(rwsem_read_intr, rwsem)(&cxl_rwsem.region); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, &rwsem))) + return rc; + + rc = test_bit(CXL_REGION_F_LOCK, &cxlr->flags); + return sysfs_emit(buf, "%d\n", rc); +} +static DEVICE_ATTR_RO(locked); + static struct attribute *cxl_region_attrs[] = { &dev_attr_uuid.attr, &dev_attr_commit.attr, @@ -776,6 +792,7 @@ static struct attribute *cxl_region_attrs[] = { &dev_attr_size.attr, &dev_attr_mode.attr, &dev_attr_extended_linear_cache_size.attr, + &dev_attr_locked.attr, NULL, }; |