From: Borislav Petkov <borislav.pet...@amd.com>
hw_inject denotes whether we want to do a hardware or a software
injection and, in the case of hardware injection, we want to do that on
a particular cpu, thus the 'cpu' attribute.
Signed-off-by: Borislav Petkov <borislav.pet...@amd.com>
---
arch/x86/ras/amd/mce-inject.c | 55 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff --git a/arch/x86/ras/amd/mce-inject.c b/arch/x86/ras/amd/mce-inject.c
index c0c811579ce9..b55d69fbd6e3 100644
--- a/arch/x86/ras/amd/mce-inject.c
+++ b/arch/x86/ras/amd/mce-inject.c
@@ -79,6 +79,59 @@ static int toggle_hw_mce_inject(unsigned int cpu, bool
enable)
}
/*
+ * HW or SW injection
+ */
+static int hw_inj_get(void *data, u64 *val)
+{
+ struct mce *m = (struct mce *)data;
+
+ *val = !!(m->inject_flags & MCJ_EXCEPTION);
+
+ return 0;
+}
+
+static int hw_inj_set(void *data, u64 val)
+{
+ struct mce *m = (struct mce *)data;
+
+ switch (val) {
+ case 0:
+ m->inject_flags &= (u8)~MCJ_EXCEPTION;
+ break;
+
+ case 1:
+ m->inject_flags |= MCJ_EXCEPTION;
+ break;
+
+ default:
+ pr_err("%s: Only 0 or 1 allowed!\n", __func__);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(hw_inj_fops, hw_inj_get, hw_inj_set, "%llu\n");
+
+/*
+ * On which CPU to inject?
+ */
+MCE_INJECT_GET(extcpu);
+
+static int inj_extcpu_set(void *data, u64 val)
+{
+ struct mce *m = (struct mce *)data;
+
+ if (val >= nr_cpu_ids || !cpu_online(val)) {
+ pr_err("%s: Invalid CPU: %llu\n", __func__, val);
+ return -EINVAL;
+ }
+ m->extcpu = val;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(extcpu_fops, inj_extcpu_get, inj_extcpu_set, "%llu\n");
+
+/*
* This denotes into which bank we're injecting and triggers
* the injection, at the same time.
*/
@@ -119,6 +172,8 @@ struct dfs_node {
{ .name = "misc", .fops = &misc_fops },
{ .name = "addr", .fops = &addr_fops },
{ .name = "bank", .fops = &bank_fops },
+ { .name = "hw_inject", .fops = &hw_inj_fops },
+ { .name = "cpu", .fops = &extcpu_fops },
};
static int __init init_mce_inject(void)
--
1.8.0.rc0.18.gf84667d
--
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