[tip:ras/core] x86/MCE: Determine MCA banks' init state properly

[tip-bot for Yazen Ghannam]

Commit-ID:  068b053dca0e2ab40b3d953b102a178654eec282
Gitweb:     https://git.kernel.org/tip/068b053dca0e2ab40b3d953b102a178654eec282
Author:     Yazen Ghannam <yazen.ghannam@xxxxxxx>
AuthorDate: Fri, 7 Jun 2019 20:18:06 +0000
Committer:  Borislav Petkov <bp@xxxxxxx>
CommitDate: Tue, 11 Jun 2019 15:23:34 +0200

x86/MCE: Determine MCA banks' init state properly

The OS is expected to write all bits to MCA_CTL for each bank,
thus enabling error reporting in all banks. However, some banks
may be unused in which case the registers for such banks are
Read-as-Zero/Writes-Ignored. Also, the OS may avoid setting some control
bits because of quirks, etc.

A bank can be considered uninitialized if the MCA_CTL register returns
zero. This is because either the OS did not write anything or because
the hardware is enforcing RAZ/WI for the bank.

Set a bank's init value based on if the control bits are set or not in
hardware. Return an error code in the sysfs interface for uninitialized
banks.

Do a final bank init check in a separate function which is not part of
any user-controlled code flows. This is so a user may enable/disable a
bank during runtime without having to restart their system.

 [ bp: Massage a bit. Discover bank init state at boot. ]

Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "linux-edac@xxxxxxxxxxxxxxx" <linux-edac@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20190607201752.221446-6-Yazen.Ghannam@xxxxxxx
---
 arch/x86/kernel/cpu/mce/core.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 10f9f140985e..c2c93e9195ed 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1490,6 +1490,11 @@ static void __mcheck_cpu_mce_banks_init(void)
 	for (i = 0; i < n_banks; i++) {
 		struct mce_bank *b = &mce_banks[i];
 
+		/*
+		 * Init them all, __mcheck_cpu_apply_quirks() is going to apply
+		 * the required vendor quirks before
+		 * __mcheck_cpu_init_clear_banks() does the final bank setup.
+		 */
 		b->ctl = -1ULL;
 		b->init = 1;
 	}
@@ -1562,6 +1567,33 @@ static void __mcheck_cpu_init_clear_banks(void)
 	}
 }
 
+/*
+ * Do a final check to see if there are any unused/RAZ banks.
+ *
+ * This must be done after the banks have been initialized and any quirks have
+ * been applied.
+ *
+ * Do not call this from any user-initiated flows, e.g. CPU hotplug or sysfs.
+ * Otherwise, a user who disables a bank will not be able to re-enable it
+ * without a system reboot.
+ */
+static void __mcheck_cpu_check_banks(void)
+{
+	struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array);
+	u64 msrval;
+	int i;
+
+	for (i = 0; i < this_cpu_read(mce_num_banks); i++) {
+		struct mce_bank *b = &mce_banks[i];
+
+		if (!b->init)
+			continue;
+
+		rdmsrl(msr_ops.ctl(i), msrval);
+		b->init = !!msrval;
+	}
+}
+
 /*
  * During IFU recovery Sandy Bridge -EP4S processors set the RIPV and
  * EIPV bits in MCG_STATUS to zero on the affected logical processor (SDM
@@ -1849,6 +1881,7 @@ void mcheck_cpu_init(struct cpuinfo_x86 *c)
 	__mcheck_cpu_init_generic();
 	__mcheck_cpu_init_vendor(c);
 	__mcheck_cpu_init_clear_banks();
+	__mcheck_cpu_check_banks();
 	__mcheck_cpu_setup_timer();
 }
 
@@ -2085,6 +2118,9 @@ static ssize_t show_bank(struct device *s, struct device_attribute *attr,
 
 	b = &per_cpu(mce_banks_array, s->id)[bank];
 
+	if (!b->init)
+		return -ENODEV;
+
 	return sprintf(buf, "%llx\n", b->ctl);
 }
 
@@ -2103,6 +2139,9 @@ static ssize_t set_bank(struct device *s, struct device_attribute *attr,
 
 	b = &per_cpu(mce_banks_array, s->id)[bank];
 
+	if (!b->init)
+		return -ENODEV;
+
 	b->ctl = new;
 	mce_restart();