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author | Mike Marciniszyn <mike.marciniszyn@intel.com> | 2014-03-07 08:40:49 -0500 |
---|---|---|
committer | Roland Dreier <roland@purestorage.com> | 2014-03-17 16:16:51 -0700 |
commit | 1ed88dd7d0b361e677b2690f573e5c274bb25c87 (patch) | |
tree | d78f5aa8f9983b92b7db9f876817199b136c3a2b /drivers/infiniband/hw | |
parent | f8b6c47a44c063062317646683a73371c24c69ee (diff) | |
download | op-kernel-dev-1ed88dd7d0b361e677b2690f573e5c274bb25c87.zip op-kernel-dev-1ed88dd7d0b361e677b2690f573e5c274bb25c87.tar.gz |
IB/qib: Add percpu counter replacing qib_devdata int_counter
This patch replaces the dd->int_counter with a percpu counter.
The maintanance of qib_stats.sps_ints and int_counter are
combined into the new counter.
There are two new functions added to read the counter:
- qib_int_counter (for a particular qib_devdata)
- qib_sps_ints (for all HCAs)
A z_int_counter is added to allow the interrupt detection logic
to determine if interrupts have occured since z_int_counter
was "reset".
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw')
-rw-r--r-- | drivers/infiniband/hw/qib/qib.h | 10 | ||||
-rw-r--r-- | drivers/infiniband/hw/qib/qib_fs.c | 1 | ||||
-rw-r--r-- | drivers/infiniband/hw/qib/qib_iba6120.c | 7 | ||||
-rw-r--r-- | drivers/infiniband/hw/qib/qib_iba7220.c | 8 | ||||
-rw-r--r-- | drivers/infiniband/hw/qib/qib_iba7322.c | 31 | ||||
-rw-r--r-- | drivers/infiniband/hw/qib/qib_init.c | 36 |
6 files changed, 59 insertions, 34 deletions
diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h index 1946101..f044430 100644 --- a/drivers/infiniband/hw/qib/qib.h +++ b/drivers/infiniband/hw/qib/qib.h @@ -868,8 +868,10 @@ struct qib_devdata { /* last buffer for user use */ u32 lastctxt_piobuf; - /* saturating counter of (non-port-specific) device interrupts */ - u32 int_counter; + /* reset value */ + u64 z_int_counter; + /* percpu intcounter */ + u64 __percpu *int_counter; /* pio bufs allocated per ctxt */ u32 pbufsctxt; @@ -1449,6 +1451,10 @@ void qib_nomsi(struct qib_devdata *); void qib_nomsix(struct qib_devdata *); void qib_pcie_getcmd(struct qib_devdata *, u16 *, u8 *, u8 *); void qib_pcie_reenable(struct qib_devdata *, u16, u8, u8); +/* interrupts for device */ +u64 qib_int_counter(struct qib_devdata *); +/* interrupt for all devices */ +u64 qib_sps_ints(void); /* * dma_addr wrappers - all 0's invalid for hw diff --git a/drivers/infiniband/hw/qib/qib_fs.c b/drivers/infiniband/hw/qib/qib_fs.c index c61e2a9..cab610c 100644 --- a/drivers/infiniband/hw/qib/qib_fs.c +++ b/drivers/infiniband/hw/qib/qib_fs.c @@ -105,6 +105,7 @@ static int create_file(const char *name, umode_t mode, static ssize_t driver_stats_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { + qib_stats.sps_ints = qib_sps_ints(); return simple_read_from_buffer(buf, count, ppos, &qib_stats, sizeof qib_stats); } diff --git a/drivers/infiniband/hw/qib/qib_iba6120.c b/drivers/infiniband/hw/qib/qib_iba6120.c index 84e593d..b9bea2e 100644 --- a/drivers/infiniband/hw/qib/qib_iba6120.c +++ b/drivers/infiniband/hw/qib/qib_iba6120.c @@ -1634,9 +1634,7 @@ static irqreturn_t qib_6120intr(int irq, void *data) goto bail; } - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); if (unlikely(istat & (~QLOGIC_IB_I_BITSEXTANT | QLOGIC_IB_I_GPIO | QLOGIC_IB_I_ERROR))) @@ -1808,7 +1806,8 @@ static int qib_6120_setup_reset(struct qib_devdata *dd) * isn't set. */ dd->flags &= ~(QIB_INITTED | QIB_PRESENT); - dd->int_counter = 0; /* so we check interrupts work again */ + /* so we check interrupts work again */ + dd->z_int_counter = qib_int_counter(dd); val = dd->control | QLOGIC_IB_C_RESET; writeq(val, &dd->kregbase[kr_control]); mb(); /* prevent compiler re-ordering around actual reset */ diff --git a/drivers/infiniband/hw/qib/qib_iba7220.c b/drivers/infiniband/hw/qib/qib_iba7220.c index 454c2e7..28063d4 100644 --- a/drivers/infiniband/hw/qib/qib_iba7220.c +++ b/drivers/infiniband/hw/qib/qib_iba7220.c @@ -1962,10 +1962,7 @@ static irqreturn_t qib_7220intr(int irq, void *data) goto bail; } - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; - + this_cpu_inc(*dd->int_counter); if (unlikely(istat & (~QLOGIC_IB_I_BITSEXTANT | QLOGIC_IB_I_GPIO | QLOGIC_IB_I_ERROR))) unlikely_7220_intr(dd, istat); @@ -2120,7 +2117,8 @@ static int qib_setup_7220_reset(struct qib_devdata *dd) * isn't set. */ dd->flags &= ~(QIB_INITTED | QIB_PRESENT); - dd->int_counter = 0; /* so we check interrupts work again */ + /* so we check interrupts work again */ + dd->z_int_counter = qib_int_counter(dd); val = dd->control | QLOGIC_IB_C_RESET; writeq(val, &dd->kregbase[kr_control]); mb(); /* prevent compiler reordering around actual reset */ diff --git a/drivers/infiniband/hw/qib/qib_iba7322.c b/drivers/infiniband/hw/qib/qib_iba7322.c index d1bd213..8441579 100644 --- a/drivers/infiniband/hw/qib/qib_iba7322.c +++ b/drivers/infiniband/hw/qib/qib_iba7322.c @@ -3115,9 +3115,7 @@ static irqreturn_t qib_7322intr(int irq, void *data) goto bail; } - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* handle "errors" of various kinds first, device ahead of port */ if (unlikely(istat & (~QIB_I_BITSEXTANT | QIB_I_GPIO | @@ -3186,9 +3184,7 @@ static irqreturn_t qib_7322pintr(int irq, void *data) */ return IRQ_HANDLED; - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* Clear the interrupt bit we expect to be set. */ qib_write_kreg(dd, kr_intclear, ((1ULL << QIB_I_RCVAVAIL_LSB) | @@ -3215,9 +3211,7 @@ static irqreturn_t qib_7322bufavail(int irq, void *data) */ return IRQ_HANDLED; - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* Clear the interrupt bit we expect to be set. */ qib_write_kreg(dd, kr_intclear, QIB_I_SPIOBUFAVAIL); @@ -3248,9 +3242,7 @@ static irqreturn_t sdma_intr(int irq, void *data) */ return IRQ_HANDLED; - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* Clear the interrupt bit we expect to be set. */ qib_write_kreg(dd, kr_intclear, ppd->hw_pidx ? @@ -3277,9 +3269,7 @@ static irqreturn_t sdma_idle_intr(int irq, void *data) */ return IRQ_HANDLED; - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* Clear the interrupt bit we expect to be set. */ qib_write_kreg(dd, kr_intclear, ppd->hw_pidx ? @@ -3306,9 +3296,7 @@ static irqreturn_t sdma_progress_intr(int irq, void *data) */ return IRQ_HANDLED; - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* Clear the interrupt bit we expect to be set. */ qib_write_kreg(dd, kr_intclear, ppd->hw_pidx ? @@ -3336,9 +3324,7 @@ static irqreturn_t sdma_cleanup_intr(int irq, void *data) */ return IRQ_HANDLED; - qib_stats.sps_ints++; - if (dd->int_counter != (u32) -1) - dd->int_counter++; + this_cpu_inc(*dd->int_counter); /* Clear the interrupt bit we expect to be set. */ qib_write_kreg(dd, kr_intclear, ppd->hw_pidx ? @@ -3723,7 +3709,8 @@ static int qib_do_7322_reset(struct qib_devdata *dd) dd->pport->cpspec->ibsymdelta = 0; dd->pport->cpspec->iblnkerrdelta = 0; dd->pport->cpspec->ibmalfdelta = 0; - dd->int_counter = 0; /* so we check interrupts work again */ + /* so we check interrupts work again */ + dd->z_int_counter = qib_int_counter(dd); /* * Keep chip from being accessed until we are ready. Use diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c index 76c3e17..6d26299 100644 --- a/drivers/infiniband/hw/qib/qib_init.c +++ b/drivers/infiniband/hw/qib/qib_init.c @@ -525,6 +525,7 @@ static void enable_chip(struct qib_devdata *dd) static void verify_interrupt(unsigned long opaque) { struct qib_devdata *dd = (struct qib_devdata *) opaque; + u64 int_counter; if (!dd) return; /* being torn down */ @@ -533,7 +534,8 @@ static void verify_interrupt(unsigned long opaque) * If we don't have a lid or any interrupts, let the user know and * don't bother checking again. */ - if (dd->int_counter == 0) { + int_counter = qib_int_counter(dd) - dd->z_int_counter; + if (int_counter == 0) { if (!dd->f_intr_fallback(dd)) dev_err(&dd->pcidev->dev, "No interrupts detected, not usable.\n"); @@ -1079,9 +1081,34 @@ void qib_free_devdata(struct qib_devdata *dd) #ifdef CONFIG_DEBUG_FS qib_dbg_ibdev_exit(&dd->verbs_dev); #endif + free_percpu(dd->int_counter); ib_dealloc_device(&dd->verbs_dev.ibdev); } +u64 qib_int_counter(struct qib_devdata *dd) +{ + int cpu; + u64 int_counter = 0; + + for_each_possible_cpu(cpu) + int_counter += *per_cpu_ptr(dd->int_counter, cpu); + return int_counter; +} + +u64 qib_sps_ints(void) +{ + unsigned long flags; + struct qib_devdata *dd; + u64 sps_ints = 0; + + spin_lock_irqsave(&qib_devs_lock, flags); + list_for_each_entry(dd, &qib_dev_list, list) { + sps_ints += qib_int_counter(dd); + } + spin_unlock_irqrestore(&qib_devs_lock, flags); + return sps_ints; +} + /* * Allocate our primary per-unit data structure. Must be done via verbs * allocator, because the verbs cleanup process both does cleanup and @@ -1119,6 +1146,13 @@ struct qib_devdata *qib_alloc_devdata(struct pci_dev *pdev, size_t extra) "Could not allocate unit ID: error %d\n", -ret); goto bail; } + dd->int_counter = alloc_percpu(u64); + if (!dd->int_counter) { + ret = -ENOMEM; + qib_early_err(&pdev->dev, + "Could not allocate per-cpu int_counter\n"); + goto bail; + } if (!qib_cpulist_count) { u32 count = num_online_cpus(); |