IB/ipath: MAD performance sampling registers support

Add support for QLogic HCAs which have hardware performance sampling
registers for PortSamplesControl and PortSamplesResult MADs.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

5 files changed, 101 insertions, 44 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_kernel.h b/drivers/infiniband/hw/ipath/ipath_kernel.h
index 7bb0d08820d8..a59c06943de6 100644
--- a/drivers/infiniband/hw/ipath/ipath_kernel.h
+++ b/drivers/infiniband/hw/ipath/ipath_kernel.h
@@ -930,6 +930,15 @@ static inline u32 ipath_read_creg32(const struct ipath_devdata *dd,
                       (char __iomem *)dd->ipath_kregbase));
 }
 
+static inline void ipath_write_creg(const struct ipath_devdata *dd,
+                                    ipath_creg regno, u64 value)
+{
+        if (dd->ipath_kregbase)
+                writeq(value, regno + (u64 __iomem *)
+                       (dd->ipath_cregbase +
+                        (char __iomem *)dd->ipath_kregbase));
+}
+
 static inline void ipath_clear_rcvhdrtail(const struct ipath_portdata *pd)
 {
         *((u64 *) pd->port_rcvhdrtail_kvaddr) = 0ULL;
diff --git a/drivers/infiniband/hw/ipath/ipath_mad.c b/drivers/infiniband/hw/ipath/ipath_mad.c
index 1978c346b5c5..d98d5f103700 100644
--- a/drivers/infiniband/hw/ipath/ipath_mad.c
+++ b/drivers/infiniband/hw/ipath/ipath_mad.c
@@ -934,6 +934,7 @@ static int recv_pma_get_portsamplescontrol(struct ib_perf *pmp,
         struct ib_pma_portsamplescontrol *p =
                 (struct ib_pma_portsamplescontrol *)pmp->data;
         struct ipath_ibdev *dev = to_idev(ibdev);
+        struct ipath_cregs const *crp = dev->dd->ipath_cregs;
         unsigned long flags;
         u8 port_select = p->port_select;
 
@@ -955,7 +956,10 @@ static int recv_pma_get_portsamplescontrol(struct ib_perf *pmp,
         p->counter_width = 4;   /* 32 bit counters */
         p->counter_mask0_9 = COUNTER_MASK0_9;
         spin_lock_irqsave(&dev->pending_lock, flags);
-        p->sample_status = dev->pma_sample_status;
+        if (crp->cr_psstat)
+                p->sample_status = ipath_read_creg32(dev->dd, crp->cr_psstat);
+        else
+                p->sample_status = dev->pma_sample_status;
         p->sample_start = cpu_to_be32(dev->pma_sample_start);
         p->sample_interval = cpu_to_be32(dev->pma_sample_interval);
         p->tag = cpu_to_be16(dev->pma_tag);
@@ -975,8 +979,9 @@ static int recv_pma_set_portsamplescontrol(struct ib_perf *pmp,
         struct ib_pma_portsamplescontrol *p =
                 (struct ib_pma_portsamplescontrol *)pmp->data;
         struct ipath_ibdev *dev = to_idev(ibdev);
+        struct ipath_cregs const *crp = dev->dd->ipath_cregs;
         unsigned long flags;
-        u32 start;
+        u8 status;
         int ret;
 
         if (pmp->attr_mod != 0 ||
@@ -986,59 +991,67 @@ static int recv_pma_set_portsamplescontrol(struct ib_perf *pmp,
                 goto bail;
         }
 
-        start = be32_to_cpu(p->sample_start);
-        if (start != 0) {
-                spin_lock_irqsave(&dev->pending_lock, flags);
-                if (dev->pma_sample_status == IB_PMA_SAMPLE_STATUS_DONE) {
-                        dev->pma_sample_status =
-                                IB_PMA_SAMPLE_STATUS_STARTED;
-                        dev->pma_sample_start = start;
-                        dev->pma_sample_interval =
-                                be32_to_cpu(p->sample_interval);
-                        dev->pma_tag = be16_to_cpu(p->tag);
-                        if (p->counter_select[0])
-                                dev->pma_counter_select[0] =
-                                        p->counter_select[0];
-                        if (p->counter_select[1])
-                                dev->pma_counter_select[1] =
-                                        p->counter_select[1];
-                        if (p->counter_select[2])
-                                dev->pma_counter_select[2] =
-                                        p->counter_select[2];
-                        if (p->counter_select[3])
-                                dev->pma_counter_select[3] =
-                                        p->counter_select[3];
-                        if (p->counter_select[4])
-                                dev->pma_counter_select[4] =
-                                        p->counter_select[4];
-                }
-                spin_unlock_irqrestore(&dev->pending_lock, flags);
+        spin_lock_irqsave(&dev->pending_lock, flags);
+        if (crp->cr_psstat)
+                status = ipath_read_creg32(dev->dd, crp->cr_psstat);
+        else
+                status = dev->pma_sample_status;
+        if (status == IB_PMA_SAMPLE_STATUS_DONE) {
+                dev->pma_sample_start = be32_to_cpu(p->sample_start);
+                dev->pma_sample_interval = be32_to_cpu(p->sample_interval);
+                dev->pma_tag = be16_to_cpu(p->tag);
+                dev->pma_counter_select[0] = p->counter_select[0];
+                dev->pma_counter_select[1] = p->counter_select[1];
+                dev->pma_counter_select[2] = p->counter_select[2];
+                dev->pma_counter_select[3] = p->counter_select[3];
+                dev->pma_counter_select[4] = p->counter_select[4];
+                if (crp->cr_psstat) {
+                        ipath_write_creg(dev->dd, crp->cr_psinterval,
+                                         dev->pma_sample_interval);
+                        ipath_write_creg(dev->dd, crp->cr_psstart,
+                                         dev->pma_sample_start);
+                } else
+                        dev->pma_sample_status = IB_PMA_SAMPLE_STATUS_STARTED;
         }
+        spin_unlock_irqrestore(&dev->pending_lock, flags);
+
         ret = recv_pma_get_portsamplescontrol(pmp, ibdev, port);
 
 bail:
         return ret;
 }
 
-static u64 get_counter(struct ipath_ibdev *dev, __be16 sel)
+static u64 get_counter(struct ipath_ibdev *dev,
+                       struct ipath_cregs const *crp,
+                       __be16 sel)
 {
         u64 ret;
 
         switch (sel) {
         case IB_PMA_PORT_XMIT_DATA:
-                ret = dev->ipath_sword;
+                ret = (crp->cr_psxmitdatacount) ?
+                        ipath_read_creg32(dev->dd, crp->cr_psxmitdatacount) :
+                        dev->ipath_sword;
                 break;
         case IB_PMA_PORT_RCV_DATA:
-                ret = dev->ipath_rword;
+                ret = (crp->cr_psrcvdatacount) ?
+                        ipath_read_creg32(dev->dd, crp->cr_psrcvdatacount) :
+                        dev->ipath_rword;
                 break;
         case IB_PMA_PORT_XMIT_PKTS:
-                ret = dev->ipath_spkts;
+                ret = (crp->cr_psxmitpktscount) ?
+                        ipath_read_creg32(dev->dd, crp->cr_psxmitpktscount) :
+                        dev->ipath_spkts;
                 break;
         case IB_PMA_PORT_RCV_PKTS:
-                ret = dev->ipath_rpkts;
+                ret = (crp->cr_psrcvpktscount) ?
+                        ipath_read_creg32(dev->dd, crp->cr_psrcvpktscount) :
+                        dev->ipath_rpkts;
                 break;
         case IB_PMA_PORT_XMIT_WAIT:
-                ret = dev->ipath_xmit_wait;
+                ret = (crp->cr_psxmitwaitcount) ?
+                        ipath_read_creg32(dev->dd, crp->cr_psxmitwaitcount) :
+                        dev->ipath_xmit_wait;
                 break;
         default:
                 ret = 0;
@@ -1053,14 +1066,21 @@ static int recv_pma_get_portsamplesresult(struct ib_perf *pmp,
         struct ib_pma_portsamplesresult *p =
                 (struct ib_pma_portsamplesresult *)pmp->data;
         struct ipath_ibdev *dev = to_idev(ibdev);
+        struct ipath_cregs const *crp = dev->dd->ipath_cregs;
+        u8 status;
         int i;
 
         memset(pmp->data, 0, sizeof(pmp->data));
         p->tag = cpu_to_be16(dev->pma_tag);
-        p->sample_status = cpu_to_be16(dev->pma_sample_status);
+        if (crp->cr_psstat)
+                status = ipath_read_creg32(dev->dd, crp->cr_psstat);
+        else
+                status = dev->pma_sample_status;
+        p->sample_status = cpu_to_be16(status);
         for (i = 0; i < ARRAY_SIZE(dev->pma_counter_select); i++)
-                p->counter[i] = cpu_to_be32(
-                        get_counter(dev, dev->pma_counter_select[i]));
+                p->counter[i] = (status != IB_PMA_SAMPLE_STATUS_DONE) ? 0 :
+                    cpu_to_be32(
+                        get_counter(dev, crp, dev->pma_counter_select[i]));
 
         return reply((struct ib_smp *) pmp);
 }
@@ -1071,16 +1091,23 @@ static int recv_pma_get_portsamplesresult_ext(struct ib_perf *pmp,
         struct ib_pma_portsamplesresult_ext *p =
                 (struct ib_pma_portsamplesresult_ext *)pmp->data;
         struct ipath_ibdev *dev = to_idev(ibdev);
+        struct ipath_cregs const *crp = dev->dd->ipath_cregs;
+        u8 status;
         int i;
 
         memset(pmp->data, 0, sizeof(pmp->data));
         p->tag = cpu_to_be16(dev->pma_tag);
-        p->sample_status = cpu_to_be16(dev->pma_sample_status);
+        if (crp->cr_psstat)
+                status = ipath_read_creg32(dev->dd, crp->cr_psstat);
+        else
+                status = dev->pma_sample_status;
+        p->sample_status = cpu_to_be16(status);
         /* 64 bits */
         p->extended_width = __constant_cpu_to_be32(0x80000000);
         for (i = 0; i < ARRAY_SIZE(dev->pma_counter_select); i++)
-                p->counter[i] = cpu_to_be64(
-                        get_counter(dev, dev->pma_counter_select[i]));
+                p->counter[i] = (status != IB_PMA_SAMPLE_STATUS_DONE) ? 0 :
+                    cpu_to_be64(
+                        get_counter(dev, crp, dev->pma_counter_select[i]));
 
         return reply((struct ib_smp *) pmp);
 }
@@ -1113,6 +1140,8 @@ static int recv_pma_get_portcounters(struct ib_perf *pmp,
                 dev->z_local_link_integrity_errors;
         cntrs.excessive_buffer_overrun_errors -=
                 dev->z_excessive_buffer_overrun_errors;
+        cntrs.vl15_dropped -= dev->z_vl15_dropped;
+        cntrs.vl15_dropped += dev->n_vl15_dropped;
 
         memset(pmp->data, 0, sizeof(pmp->data));
 
@@ -1156,10 +1185,10 @@ static int recv_pma_get_portcounters(struct ib_perf *pmp,
                 cntrs.excessive_buffer_overrun_errors = 0xFUL;
         p->lli_ebor_errors = (cntrs.local_link_integrity_errors << 4) |
                 cntrs.excessive_buffer_overrun_errors;
-        if (dev->n_vl15_dropped > 0xFFFFUL)
+        if (cntrs.vl15_dropped > 0xFFFFUL)
                 p->vl15_dropped = __constant_cpu_to_be16(0xFFFF);
         else
-                p->vl15_dropped = cpu_to_be16((u16)dev->n_vl15_dropped);
+                p->vl15_dropped = cpu_to_be16((u16)cntrs.vl15_dropped);
         if (cntrs.port_xmit_data > 0xFFFFFFFFUL)
                 p->port_xmit_data = __constant_cpu_to_be32(0xFFFFFFFF);
         else
@@ -1262,8 +1291,10 @@ static int recv_pma_set_portcounters(struct ib_perf *pmp,
                 dev->z_excessive_buffer_overrun_errors =
                         cntrs.excessive_buffer_overrun_errors;
 
-        if (p->counter_select & IB_PMA_SEL_PORT_VL15_DROPPED)
+        if (p->counter_select & IB_PMA_SEL_PORT_VL15_DROPPED) {
                 dev->n_vl15_dropped = 0;
+                dev->z_vl15_dropped = cntrs.vl15_dropped;
+        }
 
         if (p->counter_select & IB_PMA_SEL_PORT_XMIT_DATA)
                 dev->z_port_xmit_data = cntrs.port_xmit_data;
diff --git a/drivers/infiniband/hw/ipath/ipath_registers.h b/drivers/infiniband/hw/ipath/ipath_registers.h
index d7181d444ed7..156ef1473466 100644
--- a/drivers/infiniband/hw/ipath/ipath_registers.h
+++ b/drivers/infiniband/hw/ipath/ipath_registers.h
@@ -469,6 +469,20 @@ struct ipath_cregs {
         ipath_creg cr_unsupvlcnt;
         ipath_creg cr_wordrcvcnt;
         ipath_creg cr_wordsendcnt;
+        ipath_creg cr_vl15droppedpktcnt;
+        ipath_creg cr_rxotherlocalphyerrcnt;
+        ipath_creg cr_excessbufferovflcnt;
+        ipath_creg cr_locallinkintegrityerrcnt;
+        ipath_creg cr_rxvlerrcnt;
+        ipath_creg cr_rxdlidfltrcnt;
+        ipath_creg cr_psstat;
+        ipath_creg cr_psstart;
+        ipath_creg cr_psinterval;
+        ipath_creg cr_psrcvdatacount;
+        ipath_creg cr_psrcvpktscount;
+        ipath_creg cr_psxmitdatacount;
+        ipath_creg cr_psxmitpktscount;
+        ipath_creg cr_psxmitwaitcount;
 };
 
 #endif                          /* _IPATH_REGISTERS_H */
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index c4c998446c7b..a2baa618daf2 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -1641,6 +1641,7 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
                 cntrs.local_link_integrity_errors;
         idev->z_excessive_buffer_overrun_errors =
                 cntrs.excessive_buffer_overrun_errors;
+        idev->z_vl15_dropped = cntrs.vl15_dropped;
 
         /*
          * The system image GUID is supposed to be the same for all
diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.h b/drivers/infiniband/hw/ipath/ipath_verbs.h
index 6ccb54f104a3..1c8985012743 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h
@@ -554,6 +554,7 @@ struct ipath_ibdev {
         u32 z_pkey_violations;                  /* starting count for PMA */
         u32 z_local_link_integrity_errors;      /* starting count for PMA */
         u32 z_excessive_buffer_overrun_errors;  /* starting count for PMA */
+        u32 z_vl15_dropped;                     /* starting count for PMA */
         u32 n_rc_resends;
         u32 n_rc_acks;
         u32 n_rc_qacks;
@@ -598,6 +599,7 @@ struct ipath_verbs_counters {
         u64 port_rcv_packets;
         u32 local_link_integrity_errors;
         u32 excessive_buffer_overrun_errors;
+        u32 vl15_dropped;
 };
 
 static inline struct ipath_mr *to_imr(struct ib_mr *ibmr)