diff options
| author | Alison Schofield <alison.schofield@intel.com> | 2023-04-18 20:39:07 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2023-04-23 21:46:06 +0300 |
| commit | f0832a58639691af575fa28ffaeb657c51f3ca06 (patch) | |
| tree | c65835aaa444e052ccd27077e3096548e864d0ee /drivers/cxl/core/memdev.c | |
| parent | 7ff6ad1075885fdc71f6fea94b95109a582dec29 (diff) | |
| download | linux-f0832a58639691af575fa28ffaeb657c51f3ca06.tar.xz | |
cxl/region: Provide region info to the cxl_poison trace event
User space may need to know which region, if any, maps the poison
address(es) logged in a cxl_poison trace event. Since the mapping
of DPAs (device physical addresses) to a region can change, the
kernel must provide this information at the time the poison list
is read. The event informs user space that at event <timestamp>
this <region> mapped to this <DPA>, which is poisoned.
The cxl_poison trace event is already wired up to log the region
name and uuid if it receives param 'struct cxl_region'.
In order to provide that cxl_region, add another method for gathering
poison - by committed endpoint decoder mappings. This method is only
available with CONFIG_CXL_REGION and is only used if a region actually
maps the memdev where poison is being read. After the region driver
reads the poison list for all the mapped resources, poison is read for
any remaining unmapped resources.
The default method remains: read the poison by memdev resource.
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/438b01ccaa70592539e8eda4eb2b1d617ba03160.1681838292.git.alison.schofield@intel.com
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/core/memdev.c')
| -rw-r--r-- | drivers/cxl/core/memdev.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index 8be01479d40b..185b6d27b698 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -136,13 +136,24 @@ static int cxl_get_poison_by_memdev(struct cxl_memdev *cxlmd) int cxl_trigger_poison_list(struct cxl_memdev *cxlmd) { + struct cxl_port *port; int rc; + port = dev_get_drvdata(&cxlmd->dev); + if (!port || !is_cxl_endpoint(port)) + return -EINVAL; + rc = down_read_interruptible(&cxl_dpa_rwsem); if (rc) return rc; - rc = cxl_get_poison_by_memdev(cxlmd); + if (port->commit_end == -1) { + /* No regions mapped to this memdev */ + rc = cxl_get_poison_by_memdev(cxlmd); + } else { + /* Regions mapped, collect poison by endpoint */ + rc = cxl_get_poison_by_endpoint(port); + } up_read(&cxl_dpa_rwsem); return rc; |