From 199cf8c3feec2947015da84643312790b21531cb Mon Sep 17 00:00:00 2001 From: Vishal Verma Date: Thu, 20 May 2021 13:47:45 -0600 Subject: cxl/pci.c: Add a 'label_storage_size' attribute to the memdev The 'Identify Device' mailbox command returns an 'lsa_size', which is the size of the label storage area on the device. Export it as a sysfs attribute so that userspace tooling to read/write the LSA can determine the size without having to run an 'Identify Device' on their own. Cc: Ben Widawsky Cc: Dan Williams Signed-off-by: Vishal Verma Reviewed-by: Dan Williams Link: https://lore.kernel.org/r/20210520194745.1095517-1-vishal.l.verma@intel.com Signed-off-by: Dan Williams --- drivers/cxl/pci.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/cxl/pci.c') diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index c7996c2a2054..606c88ca902b 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -1036,6 +1036,16 @@ static ssize_t payload_max_show(struct device *dev, } static DEVICE_ATTR_RO(payload_max); +static ssize_t label_storage_size_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_mem *cxlm = cxlmd->cxlm; + + return sysfs_emit(buf, "%zu\n", cxlm->lsa_size); +} +static DEVICE_ATTR_RO(label_storage_size); + static ssize_t ram_size_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1065,6 +1075,7 @@ static struct device_attribute dev_attr_pmem_size = static struct attribute *cxl_memdev_attributes[] = { &dev_attr_firmware_version.attr, &dev_attr_payload_max.attr, + &dev_attr_label_storage_size.attr, NULL, }; @@ -1397,6 +1408,7 @@ static int cxl_mem_identify(struct cxl_mem *cxlm) cxlm->pmem_range.end = le64_to_cpu(id.persistent_capacity) * SZ_256M - 1; + cxlm->lsa_size = le32_to_cpu(id.lsa_size); memcpy(cxlm->firmware_version, id.fw_revision, sizeof(id.fw_revision)); return 0; -- cgit v1.2.3