diff options
Diffstat (limited to 'drivers/scsi/vmw_pvscsi.c')
| -rw-r--r-- | drivers/scsi/vmw_pvscsi.c | 49 |
1 files changed, 46 insertions, 3 deletions
diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c index 7c5abd7f6c67..b92ea94be98f 100644 --- a/drivers/scsi/vmw_pvscsi.c +++ b/drivers/scsi/vmw_pvscsi.c @@ -72,6 +72,7 @@ struct pvscsi_adapter { bool use_msi; bool use_msix; bool use_msg; + bool use_req_threshold; spinlock_t hw_lock; @@ -109,6 +110,7 @@ static int pvscsi_cmd_per_lun = PVSCSI_DEFAULT_QUEUE_DEPTH; static bool pvscsi_disable_msi; static bool pvscsi_disable_msix; static bool pvscsi_use_msg = true; +static bool pvscsi_use_req_threshold = true; #define PVSCSI_RW (S_IRUSR | S_IWUSR) @@ -133,6 +135,10 @@ MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)"); module_param_named(use_msg, pvscsi_use_msg, bool, PVSCSI_RW); MODULE_PARM_DESC(use_msg, "Use msg ring when available - (default=1)"); +module_param_named(use_req_threshold, pvscsi_use_req_threshold, + bool, PVSCSI_RW); +MODULE_PARM_DESC(use_req_threshold, "Use driver-based request coalescing if configured - (default=1)"); + static const struct pci_device_id pvscsi_pci_tbl[] = { { PCI_VDEVICE(VMWARE, PCI_DEVICE_ID_VMWARE_PVSCSI) }, { 0 } @@ -282,10 +288,15 @@ static int scsi_is_rw(unsigned char op) static void pvscsi_kick_io(const struct pvscsi_adapter *adapter, unsigned char op) { - if (scsi_is_rw(op)) - pvscsi_kick_rw_io(adapter); - else + if (scsi_is_rw(op)) { + struct PVSCSIRingsState *s = adapter->rings_state; + + if (!adapter->use_req_threshold || + s->reqProdIdx - s->reqConsIdx >= s->reqCallThreshold) + pvscsi_kick_rw_io(adapter); + } else { pvscsi_process_request_ring(adapter); + } } static void ll_adapter_reset(const struct pvscsi_adapter *adapter) @@ -1077,6 +1088,34 @@ static int pvscsi_setup_msg_workqueue(struct pvscsi_adapter *adapter) return 1; } +static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter, + bool enable) +{ + u32 val; + + if (!pvscsi_use_req_threshold) + return false; + + pvscsi_reg_write(adapter, PVSCSI_REG_OFFSET_COMMAND, + PVSCSI_CMD_SETUP_REQCALLTHRESHOLD); + val = pvscsi_reg_read(adapter, PVSCSI_REG_OFFSET_COMMAND_STATUS); + if (val == -1) { + printk(KERN_INFO "vmw_pvscsi: device does not support req_threshold\n"); + return false; + } else { + struct PVSCSICmdDescSetupReqCall cmd_msg = { 0 }; + cmd_msg.enable = enable; + printk(KERN_INFO + "vmw_pvscsi: %sabling reqCallThreshold\n", + enable ? "en" : "dis"); + pvscsi_write_cmd_desc(adapter, + PVSCSI_CMD_SETUP_REQCALLTHRESHOLD, + &cmd_msg, sizeof(cmd_msg)); + return pvscsi_reg_read(adapter, + PVSCSI_REG_OFFSET_COMMAND_STATUS) != 0; + } +} + static irqreturn_t pvscsi_isr(int irq, void *devp) { struct pvscsi_adapter *adapter = devp; @@ -1416,6 +1455,10 @@ static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id) flags = IRQF_SHARED; } + adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true); + printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n", + adapter->use_req_threshold ? "en" : "dis"); + error = request_irq(adapter->irq, pvscsi_isr, flags, "vmw_pvscsi", adapter); if (error) { |