[libata] Disable R_OK (Early ACK) on SII 3726 PMP

In 2009, While running "cache read" performance test of drives behind
SII PMP we encountered a "all 5 drives" timeout on more than 30% of the
machines under test.  This patch reduces the rate by a factor of about 70.
Low enough that we didn't care to further investigate the issue.

Performance impact with any sort of "normal" use was ~2%+ CPU and less
than 1% throughput degradation.  Worst case impact (cached read) was
6% IOPS reduction. This is with NCQ off (q=1) but I believe FIS based
switching enabled in the SATA driver.

The patch disables "Early ACK" in the 3726 port multiplier.
"Early ACK" is issued when device sends a FIS to the host (via PMP)
and the PMP sends an ACK immediately back to the device - well before
the host gets the response. Under worst case IOPs load (cached read
test) and more than 2 PMPs connected to a 4-port SATA controller,
I suspect the time to service all of the PMPs is exceeding the PMPs
ability to keep track of outstanding FIS it owes the Host. Reducing
the number of PMPs to 2 (or 1) reduces the frequency by several orders
of magnitude. Kudos to Gwendal for initial debugging of this issue.
[Any errors in the description are mine, not his.]

Patch is currently in production on Google servers.

Signed-off-by: Grant Grundler <grundler@google.com>
Signed-off-by: Gwendal Grignou <gwendal@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 29 insertions, 3 deletions

diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index 00305f41ed86..224faabd7b7e 100644
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -231,10 +231,14 @@ static const char *sata_pmp_spec_rev_str(const u32 *gscr)
         return "<unknown>";
 }
 
+#define PMP_GSCR_SII_POL 129
+
 static int sata_pmp_configure(struct ata_device *dev, int print_info)
 {
         struct ata_port *ap = dev->link->ap;
         u32 *gscr = dev->gscr;
+        u16 vendor = sata_pmp_gscr_vendor(gscr);
+        u16 devid = sata_pmp_gscr_devid(gscr);
         unsigned int err_mask = 0;
         const char *reason;
         int nr_ports, rc;
@@ -260,12 +264,34 @@ static int sata_pmp_configure(struct ata_device *dev, int print_info)
                 goto fail;
         }
 
+        /* Disable sending Early R_OK.
+         * With "cached read" HDD testing and multiple ports busy on a SATA
+         * host controller, 3726 PMP will very rarely drop a deferred
+         * R_OK that was intended for the host. Symptom will be all
+         * 5 drives under test will timeout, get reset, and recover.
+         */
+        if (vendor == 0x1095 && devid == 0x3726) {
+                u32 reg;
+
+                err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, &reg);
+                if (err_mask) {
+                        rc = -EIO;
+                        reason = "failed to read Sil3726 Private Register";
+                        goto fail;
+                }
+                reg &= ~0x1;
+                err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
+                if (err_mask) {
+                        rc = -EIO;
+                        reason = "failed to write Sil3726 Private Register";
+                        goto fail;
+                }
+        }
+
         if (print_info) {
                 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
                                "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
-                               sata_pmp_spec_rev_str(gscr),
-                               sata_pmp_gscr_vendor(gscr),
-                               sata_pmp_gscr_devid(gscr),
+                               sata_pmp_spec_rev_str(gscr), vendor, devid,
                                sata_pmp_gscr_rev(gscr),
                                nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
                                gscr[SATA_PMP_GSCR_FEAT]);