@@ -21,6 +21,7 @@
#include <linux/nmi.h>
#include <linux/delay.h>
#include <linux/mm.h>
+#include <linux/cxl.h>
#include <asm/unaligned.h>
#include "apei-internal.h"
@@ -36,6 +37,7 @@
#define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
ACPI_EINJ_MEMORY_UNCORRECTABLE | \
ACPI_EINJ_MEMORY_FATAL)
+#define CXL_ERROR_MASK GENMASK(17, 12)
/*
* ACPI version 5 provides a SET_ERROR_TYPE_WITH_ADDRESS action.
@@ -512,6 +514,24 @@ static int __einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
return rc;
}
+static int is_valid_cxl_addr(u64 addr)
+{
+ struct cxl_dport *dport;
+
+ if (IS_REACHABLE(CONFIG_CXL_ACPI)) {
+ dport = cxl_find_rch_dport_by_rcrb((resource_size_t) addr);
+
+ if (!IS_ERR_OR_NULL(dport))
+ return 1;
+ } else {
+ pr_err("CONFIG_CXL_ACPI is not reachable.\n");
+ return 0;
+ }
+
+ pr_info("Could not find dport with rcrb 0x%llx\n", addr);
+ return 0;
+}
+
/* Inject the specified hardware error */
static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
u64 param3, u64 param4)
@@ -537,8 +557,11 @@ static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
if (type & ACPI5_VENDOR_BIT) {
if (vendor_flags != SETWA_FLAGS_MEM)
goto inject;
- } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM))
+ } else if (!(type & MEM_ERROR_MASK) && !(flags & SETWA_FLAGS_MEM)) {
goto inject;
+ } else if (type & CXL_ERROR_MASK && is_valid_cxl_addr(param1)) {
+ goto inject;
+ }
/*
* Disallow crazy address masks that give BIOS leeway to pick
@@ -807,3 +830,4 @@ module_exit(einj_exit);
MODULE_AUTHOR("Huang Ying");
MODULE_DESCRIPTION("APEI Error INJection support");
MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(CXL);
@@ -1122,6 +1122,23 @@ struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
}
EXPORT_SYMBOL_NS_GPL(devm_cxl_add_rch_dport, CXL);
+struct cxl_dport *cxl_find_rch_dport_by_rcrb(resource_size_t rcrb_base)
+{
+ struct cxl_dport *dport;
+ unsigned long index;
+
+ if (!cxl_root)
+ return ERR_PTR(-ENODEV);
+
+ xa_for_each(&cxl_root->dports, index, dport)
+ if ((dport->rch && dport->rcrb.base != CXL_RESOURCE_NONE)
+ && dport->rcrb.base == rcrb_base)
+ return dport;
+
+ return NULL;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_find_rch_dport_by_rcrb, CXL);
+
static int add_ep(struct cxl_ep *new)
{
struct cxl_port *port = new->dport->port;
@@ -8,6 +8,7 @@
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/log2.h>
+#include <linux/cxl.h>
#include <linux/io.h>
/**
new file mode 100644
@@ -0,0 +1,18 @@
+#ifndef _LINUX_CXL_H
+#define _LINUX_CXL_H
+
+#include <linux/xarray.h>
+#include <linux/errno.h>
+
+struct cxl_dport;
+
+#if IS_ENABLED(CONFIG_CXL_ACPI)
+struct cxl_dport *cxl_find_rch_dport_by_rcrb(resource_size_t rcrb_base);
+#else
+struct cxl_dport *cxl_find_rch_dport_by_rcrb(resource_size_t rcrb_base)
+{
+ return NULL;
+}
+#endif
+
+#endif
Add support for CXL EINJ error types for CXL 1.1 hosts added in ACPI v6.5. Because these error types target memory-mapped CXL 1.1 compliant downstream ports and not physical (normal/persistent) memory, these error types are not currently allowed through the memory range validation done by the EINJ driver. The MMIO address of a CXL 1.1 downstream port can be found in the cxl_rcrb_addr file in the corresponding dport directory under /sys/bus/cxl/devices/portX. CXL 1.1 error types follow the same procedure as a memory error type, but with param1 set to the downstream port MMIO address. Example usage: $ cd /sys/kernel/debug/apei/einj $ cat available_error_type 0x00000008 Memory Correctable 0x00000010 Memory Uncorrectable non-fatal 0x00000020 Memory Uncorrectable fatal 0x00000040 PCI Express Correctable 0x00000080 PCI Express Uncorrectable non-fatal 0x00000100 PCI Express Uncorrectable fatal 0x00008000 CXL.mem Protocol Correctable 0x00020000 CXL.mem Protocol Uncorrectable fatal $ echo 0x8000 > error_type $ echo 0xfffffffffffff000 > param2 $ echo 0x3 > flags $ cat /sys/bus/cxl/devices/portX/dportY/cxl_rcrb_addr 0xb2f00000 $ echo 0xb2f00000 > param1 $ echo 1 > error_inject Signed-off-by: Ben Cheatham <Benjamin.Cheatham@amd.com> --- drivers/acpi/apei/einj.c | 26 +++++++++++++++++++++++++- drivers/cxl/core/port.c | 17 +++++++++++++++++ drivers/cxl/cxl.h | 1 + include/linux/cxl.h | 18 ++++++++++++++++++ 4 files changed, 61 insertions(+), 1 deletion(-) create mode 100644 include/linux/cxl.h