EDAC, sb_edac: Remove double buffering of error records

In the bad old days the functions from x86_mce_decoder_chain could be
called in machine check context. So we used to carefully copy them and
defer processing until later. But in

  f29a7aff4bd60 ("x86/mce: Avoid potential deadlock due to printk() in MCE context")

we switched the logging code to save the record in a genpool, and call
the functions that registered to be notified later from a work queue.

So drop all the double buffering and do all the work we want to do as
soon as sbridge_mce_check_error() is called.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Aristeu Rozanski <arozansk@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: patrickg@supermicro.com
Link: http://lkml.kernel.org/r/100025611cd780d9bca72792b2b2146760da53e0.1460756761.git.tony.luck@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index 93f0d41..3421674 100644 (file)
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -363,16 +363,6 @@ struct sbridge_pvt {
        /* Memory type detection */
        bool                    is_mirrored, is_lockstep, is_close_pg;
 
-       /* Fifo double buffers */
-       struct mce              mce_entry[MCE_LOG_LEN];
-       struct mce              mce_outentry[MCE_LOG_LEN];
-
-       /* Fifo in/out counters */
-       unsigned                mce_in, mce_out;
-
-       /* Count indicator to show errors not got */
-       unsigned                mce_overrun;
-
        /* Memory description */
        u64                     tolm, tohm;
        struct knl_pvt knl;
@@ -3075,63 +3065,8 @@ err_parsing:
 }
 
 /*
- *     sbridge_check_error     Retrieve and process errors reported by the
- *                             hardware. Called by the Core module.
- */
-static void sbridge_check_error(struct mem_ctl_info *mci)
-{
-       struct sbridge_pvt *pvt = mci->pvt_info;
-       int i;
-       unsigned count = 0;
-       struct mce *m;
-
-       /*
-        * MCE first step: Copy all mce errors into a temporary buffer
-        * We use a double buffering here, to reduce the risk of
-        * loosing an error.
-        */
-       smp_rmb();
-       count = (pvt->mce_out + MCE_LOG_LEN - pvt->mce_in)
-               % MCE_LOG_LEN;
-       if (!count)
-               return;
-
-       m = pvt->mce_outentry;
-       if (pvt->mce_in + count > MCE_LOG_LEN) {
-               unsigned l = MCE_LOG_LEN - pvt->mce_in;
-
-               memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * l);
-               smp_wmb();
-               pvt->mce_in = 0;
-               count -= l;
-               m += l;
-       }
-       memcpy(m, &pvt->mce_entry[pvt->mce_in], sizeof(*m) * count);
-       smp_wmb();
-       pvt->mce_in += count;
-
-       smp_rmb();
-       if (pvt->mce_overrun) {
-               sbridge_printk(KERN_ERR, "Lost %d memory errors\n",
-                             pvt->mce_overrun);
-               smp_wmb();
-               pvt->mce_overrun = 0;
-       }
-
-       /*
-        * MCE second step: parse errors and display
-        */
-       for (i = 0; i < count; i++)
-               sbridge_mce_output_error(mci, &pvt->mce_outentry[i]);
-}
-
-/*
- * sbridge_mce_check_error     Replicates mcelog routine to get errors
- *                             This routine simply queues mcelog errors, and
- *                             return. The error itself should be handled later
- *                             by sbridge_check_error.
- * WARNING: As this routine should be called at NMI time, extra care should
- * be taken to avoid deadlocks, and to be as fast as possible.
+ * Check that logging is enabled and that this is the right type
+ * of error for us to handle.
  */
 static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
                                   void *data)
@@ -3176,21 +3111,7 @@ static int sbridge_mce_check_error(struct notifier_block *nb, unsigned long val,
                          "%u APIC %x\n", mce->cpuvendor, mce->cpuid,
                          mce->time, mce->socketid, mce->apicid);
 
-       smp_rmb();
-       if ((pvt->mce_out + 1) % MCE_LOG_LEN == pvt->mce_in) {
-               smp_wmb();
-               pvt->mce_overrun++;
-               return NOTIFY_DONE;
-       }
-
-       /* Copy memory error at the ringbuffer */
-       memcpy(&pvt->mce_entry[pvt->mce_out], mce, sizeof(*mce));
-       smp_wmb();
-       pvt->mce_out = (pvt->mce_out + 1) % MCE_LOG_LEN;
-
-       /* Handle fatal errors immediately */
-       if (mce->mcgstatus & 1)
-               sbridge_check_error(mci);
+       sbridge_mce_output_error(mci, mce);
 
        /* Advice mcelog that the error were handled */
        return NOTIFY_STOP;
@@ -3276,9 +3197,6 @@ static int sbridge_register_mci(struct sbridge_dev *sbridge_dev, enum type type)
        mci->dev_name = pci_name(pdev);
        mci->ctl_page_to_phys = NULL;
 
-       /* Set the function pointer to an actual operation function */
-       mci->edac_check = sbridge_check_error;
-
        pvt->info.type = type;
        switch (type) {
        case IVY_BRIDGE: