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Subject[PATCH 8/9] x86, RAS: Add attributes needed for HW injection
Date
From: Borislav Petkov <borislav.petkov@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.petkov@amd.com>
---
arch/x86/kernel/cpu/ras/amd/mce-inject.c | 55 ++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/cpu/ras/amd/mce-inject.c b/arch/x86/kernel/cpu/ras/amd/mce-inject.c
index 1b797bd..8646080 100644
--- a/arch/x86/kernel/cpu/ras/amd/mce-inject.c
+++ b/arch/x86/kernel/cpu/ras/amd/mce-inject.c
@@ -77,6 +77,59 @@ 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_HW_MSR_INJECT);
+
+ 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_HW_MSR_INJECT;
+ break;
+
+ case 1:
+ m->inject_flags |= MCJ_HW_MSR_INJECT;
+ break;
+
+ default:
+ printk(KERN_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 >= num_online_cpus()) {
+ printk(KERN_ERR "%s: Non-existent 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.
*/
@@ -116,6 +169,8 @@ 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)
--
1.7.4.rc2


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