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cxl/core: Add CXL EINJ debugfs files

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Export CXL helper functions in einj-cxl.c for getting/injecting
available CXL protocol error types to sysfs under kernel/debug/cxl.

The kernel/debug/cxl/einj_types file will print the available CXL
protocol errors in the same format as the available_error_types
file provided by the einj module. The
kernel/debug/cxl/$dport_dev/einj_inject file is functionally the same
as the error_type and error_inject files provided by the EINJ module,
i.e.: writing an error type into $dport_dev/einj_inject will inject
said error type into the CXL dport represented by $dport_dev.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ben Cheatham <Benjamin.Cheatham@amd.com>
Link: https://lore.kernel.org/r/20240311142508.31717-4-Benjamin.Cheatham@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ben Cheatham 2024-03-11 09:25:07 -05:00 committed by Dan Williams
parent 12fb28ea6b
commit 8039804cfa
2 changed files with 71 additions and 0 deletions
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30
Documentation/ABI/testing/debugfs-cxl
View File

@ -33,3 +33,33 @@ Description:
device cannot clear poison from the address, -ENXIO is returned.
The clear_poison attribute is only visible for devices
supporting the capability.
What: /sys/kernel/debug/cxl/einj_types
Date: January, 2024
KernelVersion: v6.9
Contact: linux-cxl@vger.kernel.org
Description:
(RO) Prints the CXL protocol error types made available by
the platform in the format "0x<error number> <error type>".
The possible error types are (as of ACPI v6.5):
0x1000 CXL.cache Protocol Correctable
0x2000 CXL.cache Protocol Uncorrectable non-fatal
0x4000 CXL.cache Protocol Uncorrectable fatal
0x8000 CXL.mem Protocol Correctable
0x10000 CXL.mem Protocol Uncorrectable non-fatal
0x20000 CXL.mem Protocol Uncorrectable fatal
The <error number> can be written to einj_inject to inject
<error type> into a chosen dport.
What: /sys/kernel/debug/cxl/$dport_dev/einj_inject
Date: January, 2024
KernelVersion: v6.9
Contact: linux-cxl@vger.kernel.org
Description:
(WO) Writing an integer to this file injects the corresponding
CXL protocol error into $dport_dev ($dport_dev will be a device
name from /sys/bus/pci/devices). The integer to type mapping for
injection can be found by reading from einj_types. If the dport
was enumerated in RCH mode, a CXL 1.1 error is injected, otherwise
a CXL 2.0 error is injected.

41
drivers/cxl/core/port.c
View File

@ -3,6 +3,7 @@
#include <linux/platform_device.h>
#include <linux/memregion.h>
#include <linux/workqueue.h>
#include <linux/einj-cxl.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/module.h>
@ -793,6 +794,40 @@ static int cxl_dport_setup_regs(struct device *host, struct cxl_dport *dport,
return rc;
}
DEFINE_SHOW_ATTRIBUTE(einj_cxl_available_error_type);
static int cxl_einj_inject(void *data, u64 type)
{
struct cxl_dport *dport = data;
if (dport->rch)
return einj_cxl_inject_rch_error(dport->rcrb.base, type);
return einj_cxl_inject_error(to_pci_dev(dport->dport_dev), type);
}
DEFINE_DEBUGFS_ATTRIBUTE(cxl_einj_inject_fops, NULL, cxl_einj_inject,
"0x%llx\n");
static void cxl_debugfs_create_dport_dir(struct cxl_dport *dport)
{
struct dentry *dir;
if (!einj_cxl_is_initialized())
return;
/*
* dport_dev needs to be a PCIe port for CXL 2.0+ ports because
* EINJ expects a dport SBDF to be specified for 2.0 error injection.
*/
if (!dport->rch && !dev_is_pci(dport->dport_dev))
return;
dir = cxl_debugfs_create_dir(dev_name(dport->dport_dev));
debugfs_create_file("einj_inject", 0200, dir, dport,
&cxl_einj_inject_fops);
}
static struct cxl_port *__devm_cxl_add_port(struct device *host,
struct device *uport_dev,
resource_size_t component_reg_phys,
@ -1149,6 +1184,8 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
if (dev_is_pci(dport_dev))
dport->link_latency = cxl_pci_get_latency(to_pci_dev(dport_dev));
cxl_debugfs_create_dport_dir(dport);
return dport;
}
@ -2221,6 +2258,10 @@ static __init int cxl_core_init(void)
cxl_debugfs = debugfs_create_dir("cxl", NULL);
if (einj_cxl_is_initialized())
debugfs_create_file("einj_types", 0400, cxl_debugfs, NULL,
&einj_cxl_available_error_type_fops);
cxl_mbox_init();
rc = cxl_memdev_init();