If poison is detected(reported from cxl memdev), OS should be notified to
handle it. Introduce this function:
1. translate DPA to HPA;
2. construct a MCE instance; (TODO: more details need to be filled)
3. log it into MCE event queue;
After that, MCE mechanism can walk over its notifier chain to execute
specific handlers.
Signed-off-by: Shiyang Ruan <ruansy.f...@fujitsu.com>
---
arch/x86/kernel/cpu/mce/core.c | 1 +
drivers/cxl/core/mbox.c | 33 +++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+)
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index bc39252bc54f..a64c0aceb7e0 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -131,6 +131,7 @@ void mce_setup(struct mce *m)
m->ppin = cpu_data(m->extcpu).ppin;
m->microcode = boot_cpu_data.microcode;
}
+EXPORT_SYMBOL_GPL(mce_setup);
DEFINE_PER_CPU(struct mce, injectm);
EXPORT_PER_CPU_SYMBOL_GPL(injectm);
diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 27166a411705..f9b6f50fbe80 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -4,6 +4,7 @@
#include <linux/debugfs.h>
#include <linux/ktime.h>
#include <linux/mutex.h>
+#include <asm/mce.h>
#include <asm/unaligned.h>
#include <cxlpci.h>
#include <cxlmem.h>
@@ -1290,6 +1291,38 @@ int cxl_set_timestamp(struct cxl_memdev_state *mds)
}
EXPORT_SYMBOL_NS_GPL(cxl_set_timestamp, CXL);
+static void cxl_mem_report_poison(struct cxl_memdev *cxlmd,
+ struct cxl_poison_record *poison)
+{
+ struct mce m;
+ u64 dpa = le64_to_cpu(poison->address) & CXL_POISON_START_MASK;
+ u64 len = le64_to_cpu(poison->length), i;
+ phys_addr_t phys_addr = cxl_memdev_dpa_to_hpa(cxlmd, dpa);
+
+ if (phys_addr)
+ return;
+
+ /*
+ * Initialize struct mce. Call preempt_disable() to avoid
+ * "BUG: using smp_processor_id() in preemptible" for now, not sure
+ * if this is a correct way.
+ */
+ preempt_disable();
+ mce_setup(&m);
+ preempt_enable();
+
+ m.bank = -1;
+ /* Fake a memory read error with unknown channel */
+ m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV |
+ MCI_STATUS_MISCV | 0x9f;
+ m.misc = (MCI_MISC_ADDR_PHYS << 6);
+
+ for (i = 0; i < len; i++) {
+ m.addr = phys_addr++;
+ mce_log(&m);
+ }
+}
+
int cxl_mem_get_poison(struct cxl_memdev *cxlmd, u64 offset, u64 len,
struct cxl_region *cxlr)
{
--
2.34.1
