IB/ipath: Verify host bus bandwidth to chip will not limit performance

There have been a number of issues where host bandwidth via HT or PCIe
to the InfiniPath chip has been limited in some fashion (BIOS,
configuration, etc.), resulting in user confusion.  This check gives a
clear warning that something is wrong and needs to be resolved.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ipath/ipath_driver.c b/drivers/infiniband/hw/ipath/ipath_driver.c
index 6ccba365a24c90821edfd3a247692221318bf57b..5248f57fe198b02a2da550eb1d7d4a4ddc8f0d6a 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_driver.c
+++ b/drivers/infiniband/hw/ipath/ipath_driver.c
@@ -34,6 +34,7 @@
 #include <linux/spinlock.h>
 #include <linux/idr.h>
 #include <linux/pci.h>
+#include <linux/io.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/vmalloc.h>
@@ -280,6 +281,89 @@ void __attribute__((weak)) ipath_disable_wc(struct ipath_devdata *dd)
 {
 }
 
+/*
+ * Perform a PIO buffer bandwidth write test, to verify proper system
+ * configuration.  Even when all the setup calls work, occasionally
+ * BIOS or other issues can prevent write combining from working, or
+ * can cause other bandwidth problems to the chip.
+ *
+ * This test simply writes the same buffer over and over again, and
+ * measures close to the peak bandwidth to the chip (not testing
+ * data bandwidth to the wire).   On chips that use an address-based
+ * trigger to send packets to the wire, this is easy.  On chips that
+ * use a count to trigger, we want to make sure that the packet doesn't
+ * go out on the wire, or trigger flow control checks.
+ */
+static void ipath_verify_pioperf(struct ipath_devdata *dd)
+{
+       u32 pbnum, cnt, lcnt;
+       u32 __iomem *piobuf;
+       u32 *addr;
+       u64 msecs, emsecs;
+
+       piobuf = ipath_getpiobuf(dd, &pbnum);
+       if (!piobuf) {
+               dev_info(&dd->pcidev->dev,
+                       "No PIObufs for checking perf, skipping\n");
+               return;
+       }
+
+       /*
+        * Enough to give us a reasonable test, less than piobuf size, and
+        * likely multiple of store buffer length.
+        */
+       cnt = 1024;
+
+       addr = vmalloc(cnt);
+       if (!addr) {
+               dev_info(&dd->pcidev->dev,
+                       "Couldn't get memory for checking PIO perf,"
+                       " skipping\n");
+               goto done;
+       }
+
+       preempt_disable();  /* we want reasonably accurate elapsed time */
+       msecs = 1 + jiffies_to_msecs(jiffies);
+       for (lcnt = 0; lcnt < 10000U; lcnt++) {
+               /* wait until we cross msec boundary */
+               if (jiffies_to_msecs(jiffies) >= msecs)
+                       break;
+               udelay(1);
+       }
+
+       writeq(0, piobuf); /* length 0, no dwords actually sent */
+       ipath_flush_wc();
+
+       /*
+        * this is only roughly accurate, since even with preempt we
+        * still take interrupts that could take a while.   Running for
+        * >= 5 msec seems to get us "close enough" to accurate values
+        */
+       msecs = jiffies_to_msecs(jiffies);
+       for (emsecs = lcnt = 0; emsecs <= 5UL; lcnt++) {
+               __iowrite32_copy(piobuf + 64, addr, cnt >> 2);
+               emsecs = jiffies_to_msecs(jiffies) - msecs;
+       }
+
+       /* 1 GiB/sec, slightly over IB SDR line rate */
+       if (lcnt < (emsecs * 1024U))
+               ipath_dev_err(dd,
+                       "Performance problem: bandwidth to PIO buffers is "
+                       "only %u MiB/sec\n",
+                       lcnt / (u32) emsecs);
+       else
+               ipath_dbg("PIO buffer bandwidth %u MiB/sec is OK\n",
+                       lcnt / (u32) emsecs);
+
+       preempt_enable();
+
+       vfree(addr);
+
+done:
+       /* disarm piobuf, so it's available again */
+       ipath_disarm_piobufs(dd, pbnum, 1);
+}
+
 static int __devinit ipath_init_one(struct pci_dev *pdev,
                                    const struct pci_device_id *ent)
 {
@@ -515,6 +599,8 @@ static int __devinit ipath_init_one(struct pci_dev *pdev,
                ret = 0;
        }
 
+       ipath_verify_pioperf(dd);
+
        ipath_device_create_group(&pdev->dev, dd);
        ipathfs_add_device(dd);
        ipath_user_add(dd);