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| author | Dan Williams <dan.j.williams@intel.com> | 2022-05-26 12:15:25 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-10 10:10:30 -0700 |
| commit | cc2a4878700b2467f36e03f581a0a877ae6a568d (patch) | |
| tree | 735495d6c22d8060fe2212631050aaa37e08d75a /drivers/cxl/mem.c | |
| parent | 9b99ecf5a316f056d7139fa76198c8a2297846d1 (diff) | |
| download | lwn-cc2a4878700b2467f36e03f581a0a877ae6a568d.tar.gz lwn-cc2a4878700b2467f36e03f581a0a877ae6a568d.zip | |
cxl/mem: Add a debugfs version of 'iomem' for DPA, 'dpamem'
Dump the device-physical-address map for a CXL expander in /proc/iomem
style format. E.g.:
cat /sys/kernel/debug/cxl/mem1/dpamem
00000000-0fffffff : ram
10000000-1fffffff : pmem
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165603885318.551046.8308248564880066726.stgit@dwillia2-xfh
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/mem.c')
| -rw-r--r-- | drivers/cxl/mem.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index a979d0b484d5..7513bea55145 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2022 Intel Corporation. All rights reserved. */ +#include <linux/debugfs.h> #include <linux/device.h> #include <linux/module.h> #include <linux/pci.h> @@ -56,10 +57,26 @@ static void enable_suspend(void *data) cxl_mem_active_dec(); } +static void remove_debugfs(void *dentry) +{ + debugfs_remove_recursive(dentry); +} + +static int cxl_mem_dpa_show(struct seq_file *file, void *data) +{ + struct device *dev = file->private; + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + + cxl_dpa_debug(file, cxlmd->cxlds); + + return 0; +} + static int cxl_mem_probe(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_port *parent_port; + struct dentry *dentry; int rc; /* @@ -73,6 +90,12 @@ static int cxl_mem_probe(struct device *dev) if (work_pending(&cxlmd->detach_work)) return -EBUSY; + dentry = cxl_debugfs_create_dir(dev_name(dev)); + debugfs_create_devm_seqfile(dev, "dpamem", dentry, cxl_mem_dpa_show); + rc = devm_add_action_or_reset(dev, remove_debugfs, dentry); + if (rc) + return rc; + rc = devm_cxl_enumerate_ports(cxlmd); if (rc) return rc; |