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cxl/core: Add locked variants of the poison inject and clear funcs 

The core functions that validate and send inject and clear commands
to the memdev devices require holding both the dpa_rwsem and the
region_rwsem.

In preparation for another caller of these functions that must hold
the locks upon entry, split the work into a locked and unlocked pair.

Consideration was given to moving the locking to both callers,
however, the existing caller is not in the core (mem.c) and cannot
access the locks.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/1d601f586975195733984ca63d1b5789bbe8690f.1754290144.git.alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Alison Schofield 2025-08-04 01:00:12 -07:00 committed by Dave Jiang
parent dc18117049
commit 25a0207828
2 changed files with 38 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/cxl/core/memdev.c
View File

@ -276,7 +276,7 @@ static int cxl_validate_poison_dpa(struct cxl_memdev *cxlmd, u64 dpa)
return 0;
}
int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa)
int cxl_inject_poison_locked(struct cxl_memdev *cxlmd, u64 dpa)
{
struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox;
struct cxl_mbox_inject_poison inject;
@ -288,13 +288,8 @@ int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa)
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &region_rwsem)))
return rc;
ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem)))
return rc;
lockdep_assert_held(&cxl_rwsem.dpa);
lockdep_assert_held(&cxl_rwsem.region);
rc = cxl_validate_poison_dpa(cxlmd, dpa);
if (rc)
@ -324,9 +319,24 @@ int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa)
return 0;
}
int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa)
{
int rc;
ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &region_rwsem)))
return rc;
ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem)))
return rc;
return cxl_inject_poison_locked(cxlmd, dpa);
}
EXPORT_SYMBOL_NS_GPL(cxl_inject_poison, "CXL");
int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa)
int cxl_clear_poison_locked(struct cxl_memdev *cxlmd, u64 dpa)
{
struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox;
struct cxl_mbox_clear_poison clear;
@ -338,13 +348,8 @@ int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa)
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return 0;
ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &region_rwsem)))
return rc;
ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem)))
return rc;
lockdep_assert_held(&cxl_rwsem.dpa);
lockdep_assert_held(&cxl_rwsem.region);
rc = cxl_validate_poison_dpa(cxlmd, dpa);
if (rc)
@ -383,6 +388,21 @@ int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa)
return 0;
}
int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa)
{
int rc;
ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &region_rwsem)))
return rc;
ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa);
if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem)))
return rc;
return cxl_clear_poison_locked(cxlmd, dpa);
}
EXPORT_SYMBOL_NS_GPL(cxl_clear_poison, "CXL");
static struct attribute *cxl_memdev_attributes[] = {

2
drivers/cxl/cxlmem.h
View File

@ -869,6 +869,8 @@ int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
int cxl_trigger_poison_list(struct cxl_memdev *cxlmd);
int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa);
int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa);
int cxl_inject_poison_locked(struct cxl_memdev *cxlmd, u64 dpa);
int cxl_clear_poison_locked(struct cxl_memdev *cxlmd, u64 dpa);
#ifdef CONFIG_CXL_EDAC_MEM_FEATURES
int devm_cxl_memdev_edac_register(struct cxl_memdev *cxlmd);