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// SPDX-License-Identifier: GPL-2.0-only
/*
* CXL Error INJection support. Used by CXL core to inject
* protocol errors into CXL ports.
*
* Copyright (C) 2023 Advanced Micro Devices, Inc.
*
* Author: Ben Cheatham <benjamin.cheatham@amd.com>
*/
#include <linux/seq_file.h>
#include <linux/pci.h>
#include <cxl/einj.h>
#include "apei-internal.h"
/* Defined in einj-core.c */
extern bool einj_initialized;
static struct { u32 mask; const char *str; } const einj_cxl_error_type_string[] = {
{ ACPI_EINJ_CXL_CACHE_CORRECTABLE, "CXL.cache Protocol Correctable" },
{ ACPI_EINJ_CXL_CACHE_UNCORRECTABLE, "CXL.cache Protocol Uncorrectable non-fatal" },
{ ACPI_EINJ_CXL_CACHE_FATAL, "CXL.cache Protocol Uncorrectable fatal" },
{ ACPI_EINJ_CXL_MEM_CORRECTABLE, "CXL.mem Protocol Correctable" },
{ ACPI_EINJ_CXL_MEM_UNCORRECTABLE, "CXL.mem Protocol Uncorrectable non-fatal" },
{ ACPI_EINJ_CXL_MEM_FATAL, "CXL.mem Protocol Uncorrectable fatal" },
};
int einj_cxl_available_error_type_show(struct seq_file *m, void *v)
{
int cxl_err, rc;
u32 available_error_type = 0;
rc = einj_get_available_error_type(&available_error_type);
if (rc)
return rc;
for (int pos = 0; pos < ARRAY_SIZE(einj_cxl_error_type_string); pos++) {
cxl_err = ACPI_EINJ_CXL_CACHE_CORRECTABLE << pos;
if (available_error_type & cxl_err)
seq_printf(m, "0x%08x\t%s\n",
einj_cxl_error_type_string[pos].mask,
einj_cxl_error_type_string[pos].str);
}
return 0;
}
EXPORT_SYMBOL_NS_GPL(einj_cxl_available_error_type_show, CXL);
static int cxl_dport_get_sbdf(struct pci_dev *dport_dev, u64 *sbdf)
{
struct pci_bus *pbus;
struct pci_host_bridge *bridge;
u64 seg = 0, bus;
pbus = dport_dev->bus;
bridge = pci_find_host_bridge(pbus);
if (!bridge)
return -ENODEV;
if (bridge->domain_nr != PCI_DOMAIN_NR_NOT_SET)
seg = bridge->domain_nr;
bus = pbus->number;
*sbdf = (seg << 24) | (bus << 16) | dport_dev->devfn;
return 0;
}
int einj_cxl_inject_rch_error(u64 rcrb, u64 type)
{
int rc;
/* Only CXL error types can be specified */
if (!einj_is_cxl_error_type(type))
return -EINVAL;
rc = einj_validate_error_type(type);
if (rc)
return rc;
return einj_cxl_rch_error_inject(type, 0x2, rcrb, GENMASK_ULL(63, 0),
0, 0);
}
EXPORT_SYMBOL_NS_GPL(einj_cxl_inject_rch_error, CXL);
int einj_cxl_inject_error(struct pci_dev *dport, u64 type)
{
u64 param4 = 0;
int rc;
/* Only CXL error types can be specified */
if (!einj_is_cxl_error_type(type))
return -EINVAL;
rc = einj_validate_error_type(type);
if (rc)
return rc;
rc = cxl_dport_get_sbdf(dport, ¶m4);
if (rc)
return rc;
return einj_error_inject(type, 0x4, 0, 0, 0, param4);
}
EXPORT_SYMBOL_NS_GPL(einj_cxl_inject_error, CXL);
bool einj_cxl_is_initialized(void)
{
return einj_initialized;
}
EXPORT_SYMBOL_NS_GPL(einj_cxl_is_initialized, CXL);
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