From 1782199f96eab4ad28c0334f27eb5a52b6c62428 Mon Sep 17 00:00:00 2001 From: Mithlesh Thukral Date: Fri, 6 Feb 2009 19:32:28 +0530 Subject: [PATCH] Staging: sxg: Make SXG driver use MSI-X interrupts if possible Make Sahara SXG driver use MSI-X interrupts instead of line based interrupts if possible. In case of problems in getting MSI-X vectors or MSI-X not being supported, driver will fall back to use previous line based interrupts. Signed-off-by: LinSysSoft Sahara Team Signed-off-by: Mithlesh Thukral Signed-off-by: Greg Kroah-Hartman --- drivers/staging/sxg/sxg.c | 162 +++++++++++++++++++++++++++++++++----- drivers/staging/sxg/sxg.h | 5 +- 2 files changed, 146 insertions(+), 21 deletions(-) diff --git a/drivers/staging/sxg/sxg.c b/drivers/staging/sxg/sxg.c index 75c4982d6a3f..287edb7b86f1 100644 --- a/drivers/staging/sxg/sxg.c +++ b/drivers/staging/sxg/sxg.c @@ -132,6 +132,9 @@ void sxg_free_sgl_buffers(struct adapter_t *adapter); void sxg_unmap_resources(struct adapter_t *adapter); void sxg_free_mcast_addrs(struct adapter_t *adapter); void sxg_collect_statistics(struct adapter_t *adapter); +static int sxg_register_interrupt(struct adapter_t *adapter); +static void sxg_remove_isr(struct adapter_t *adapter); +static irqreturn_t sxg_isr(int irq, void *dev_id); #define XXXTODO 0 @@ -250,6 +253,131 @@ static struct sxg_trace_buffer LSxgTraceBuffer; #endif /* ATKDBG */ static struct sxg_trace_buffer *SxgTraceBuffer = NULL; +/* + * MSI Related API's + */ +int sxg_register_intr(struct adapter_t *adapter); +int sxg_enable_msi_x(struct adapter_t *adapter); +int sxg_add_msi_isr(struct adapter_t *adapter); +void sxg_remove_msix_isr(struct adapter_t *adapter); +int sxg_set_interrupt_capability(struct adapter_t *adapter); + +int sxg_set_interrupt_capability(struct adapter_t *adapter) +{ + int ret; + + ret = sxg_enable_msi_x(adapter); + if (ret != STATUS_SUCCESS) { + adapter->msi_enabled = FALSE; + DBG_ERROR("sxg_set_interrupt_capability MSI-X Disable\n"); + } else { + adapter->msi_enabled = TRUE; + DBG_ERROR("sxg_set_interrupt_capability MSI-X Enable\n"); + } + return ret; +} + +int sxg_register_intr(struct adapter_t *adapter) +{ + int ret = 0; + + if (adapter->msi_enabled) { + ret = sxg_add_msi_isr(adapter); + } + else { + DBG_ERROR("MSI-X Enable Failed. Using Pin INT\n"); + ret = sxg_register_interrupt(adapter); + if (ret != STATUS_SUCCESS) { + DBG_ERROR("sxg_register_interrupt Failed\n"); + } + } + return ret; +} + +int sxg_enable_msi_x(struct adapter_t *adapter) +{ + int ret; + + adapter->nr_msix_entries = 1; + adapter->msi_entries = kmalloc(adapter->nr_msix_entries * + sizeof(struct msix_entry),GFP_KERNEL); + if (!adapter->msi_entries) { + DBG_ERROR("%s:MSI Entries memory allocation Failed\n",__func__); + return -ENOMEM; + } + memset(adapter->msi_entries, 0, adapter->nr_msix_entries * + sizeof(struct msix_entry)); + + ret = pci_enable_msix(adapter->pcidev, adapter->msi_entries, + adapter->nr_msix_entries); + if (ret) { + DBG_ERROR("Enabling MSI-X with %d vectors failed\n", + adapter->nr_msix_entries); + /*Should try with less vector returned.*/ + kfree(adapter->msi_entries); + return STATUS_FAILURE; /*MSI-X Enable failed.*/ + } + return (STATUS_SUCCESS); +} + +int sxg_add_msi_isr(struct adapter_t *adapter) +{ + int ret,i; + + if (!adapter->intrregistered) { + for (i=0; inr_msix_entries; i++) { + ret = request_irq (adapter->msi_entries[i].vector, + sxg_isr, + IRQF_SHARED, + adapter->netdev->name, + adapter->netdev); + if (ret) { + DBG_ERROR("sxg: MSI-X request_irq (%s) " + "FAILED [%x]\n", adapter->netdev->name, + ret); + return (ret); + } + } + } + adapter->msi_enabled = TRUE; + adapter->intrregistered = 1; + adapter->IntRegistered = TRUE; + return (STATUS_SUCCESS); +} + +void sxg_remove_msix_isr(struct adapter_t *adapter) +{ + int i,vector; + struct net_device *netdev = adapter->netdev; + + for(i=0; i< adapter->nr_msix_entries;i++) + { + vector = adapter->msi_entries[i].vector; + DBG_ERROR("%s : Freeing IRQ vector#%d\n",__FUNCTION__,vector); + free_irq(vector,netdev); + } +} + + +static void sxg_remove_isr(struct adapter_t *adapter) +{ + struct net_device *netdev = adapter->netdev; + if (adapter->msi_enabled) + sxg_remove_msix_isr(adapter); + else + free_irq(adapter->netdev->irq, netdev); +} + +void sxg_reset_interrupt_capability(struct adapter_t *adapter) +{ + if (adapter->msi_enabled) { + pci_disable_msix(adapter->pcidev); + kfree(adapter->msi_entries); + adapter->msi_entries = NULL; + } + return; +} + /* * sxg_download_microcode * @@ -462,7 +590,7 @@ static int sxg_allocate_resources(struct adapter_t *adapter) /* Windows tells us how many CPUs it plans to use for */ /* RSS */ RssIds = SXG_RSS_CPU_COUNT(adapter); - IsrCount = adapter->MsiEnabled ? RssIds : 1; + IsrCount = adapter->msi_enabled ? RssIds : 1; DBG_ERROR("%s Setup the spinlocks\n", __func__); @@ -950,6 +1078,9 @@ static int sxg_entry_probe(struct pci_dev *pcidev, netdev->get_stats = sxg_get_stats; netdev->set_multicast_list = sxg_mcast_set_list; SET_ETHTOOL_OPS(netdev, &sxg_nic_ethtool_ops); + err = sxg_set_interrupt_capability(adapter); + if (err != STATUS_SUCCESS) + DBG_ERROR("Cannot enable MSI-X capability\n"); strcpy(netdev->name, "eth%d"); /* strcpy(netdev->name, pci_name(pcidev)); */ @@ -1025,7 +1156,6 @@ static void sxg_disable_interrupt(struct adapter_t *adapter) adapter, adapter->InterruptsEnabled, 0, 0); /* For now, RSS is disabled with line based interrupts */ ASSERT(adapter->RssEnabled == FALSE); - ASSERT(adapter->MsiEnabled == FALSE); /* Turn off interrupts by writing to the icr register. */ WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_DISABLE), TRUE); @@ -1053,7 +1183,6 @@ static void sxg_enable_interrupt(struct adapter_t *adapter) adapter, adapter->InterruptsEnabled, 0, 0); /* For now, RSS is disabled with line based interrupts */ ASSERT(adapter->RssEnabled == FALSE); - ASSERT(adapter->MsiEnabled == FALSE); /* Turn on interrupts by writing to the icr register. */ WRITE_REG(adapter->UcodeRegs[0].Icr, SXG_ICR(0, SXG_ICR_ENABLE), TRUE); @@ -1154,7 +1283,6 @@ static void sxg_handle_interrupt(struct adapter_t *adapter, int *work_done, adapter, adapter->IsrCopy[0], 0, 0); /* For now, RSS is disabled with line based interrupts */ ASSERT(adapter->RssEnabled == FALSE); - ASSERT(adapter->MsiEnabled == FALSE); adapter->IsrCopy[0] = adapter->Isr[0]; adapter->Isr[0] = 0; @@ -1197,7 +1325,6 @@ static int sxg_poll(struct napi_struct *napi, int budget) netif_rx_complete(napi); WRITE_REG(adapter->UcodeRegs[0].Isr, 0, TRUE); } - return work_done; } @@ -1845,7 +1972,6 @@ static int sxg_register_interrupt(struct adapter_t *adapter) adapter->intrregistered = 1; adapter->IntRegistered = TRUE; /* Disable RSS with line-based interrupts */ - adapter->MsiEnabled = FALSE; adapter->RssEnabled = FALSE; DBG_ERROR("sxg: %s AllocAdaptRsrcs adapter[%p] dev->irq[%x]\n", __func__, adapter, adapter->netdev->irq); @@ -1919,9 +2045,9 @@ static int sxg_if_init(struct adapter_t *adapter) } DBG_ERROR("\n"); } - status = sxg_register_interrupt(adapter); + status = sxg_register_intr(adapter); if (status != STATUS_SUCCESS) { - DBG_ERROR("sxg_if_init: sxg_register_interrupt FAILED %x\n", + DBG_ERROR("sxg_if_init: sxg_register_intr FAILED %x\n", status); sxg_deregister_interrupt(adapter); return (status); @@ -2081,8 +2207,8 @@ int sxg_second_open(struct net_device * dev) SXG_ENABLE_ALL_INTERRUPTS(adapter); netif_carrier_on(dev); - spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags); sxg_register_interrupt(adapter); + spin_unlock_irqrestore(&sxg_global.driver_lock, sxg_global.flags); return (STATUS_SUCCESS); } @@ -2099,6 +2225,7 @@ static void __devexit sxg_entry_remove(struct pci_dev *pcidev) /* Deallocate Resources */ unregister_netdev(dev); + sxg_reset_interrupt_capability(adapter); sxg_free_resources(adapter); ASSERT(adapter); @@ -2133,7 +2260,7 @@ static int sxg_entry_halt(struct net_device *dev) unsigned long flags; RssIds = SXG_RSS_CPU_COUNT(adapter); - IsrCount = adapter->MsiEnabled ? RssIds : 1; + IsrCount = adapter->msi_enabled ? RssIds : 1; napi_disable(&adapter->napi); spin_lock_irqsave(&sxg_global.driver_lock, sxg_global.flags); @@ -2147,9 +2274,6 @@ static int sxg_entry_halt(struct net_device *dev) DBG_ERROR("sxg: %s (%s) set adapter[%p] state to ADAPT_DOWN(%d)\n", __func__, dev->name, adapter, adapter->state); - DBG_ERROR("sxg: %s (%s) EXIT\n", __func__, dev->name); - DBG_ERROR("sxg: %s EXIT\n", __func__); - /* Disable interrupts */ SXG_DISABLE_ALL_INTERRUPTS(adapter); @@ -2196,11 +2320,13 @@ static int sxg_entry_halt(struct net_device *dev) memset(adapter->XmtRingZeroIndex, 0, sizeof(u32)); spin_unlock_irqrestore(&adapter->XmtZeroLock, flags); - for (i = 0; i < SXG_MAX_RSS; i++) { adapter->NextEvent[i] = 0; } atomic_set(&adapter->pending_allocations, 0); + adapter->intrregistered = 0; + sxg_remove_isr(adapter); + DBG_ERROR("sxg: %s (%s) EXIT\n", __FUNCTION__, dev->name); return (STATUS_SUCCESS); } @@ -3451,9 +3577,8 @@ void sxg_unmap_resources(struct adapter_t *adapter) void sxg_free_resources(struct adapter_t *adapter) { u32 RssIds, IsrCount; - struct net_device *netdev = adapter->netdev; RssIds = SXG_RSS_CPU_COUNT(adapter); - IsrCount = adapter->MsiEnabled ? RssIds : 1; + IsrCount = adapter->msi_enabled ? RssIds : 1; if (adapter->BasicAllocations == FALSE) { /* @@ -3463,9 +3588,6 @@ void sxg_free_resources(struct adapter_t *adapter) return; } - /* Free Irq */ - free_irq(adapter->netdev->irq, netdev); - if (!(IsListEmpty(&adapter->AllRcvBlocks))) { sxg_free_rcvblocks(adapter); } @@ -3877,7 +3999,7 @@ static int sxg_initialize_adapter(struct adapter_t *adapter) adapter, 0, 0, 0); RssIds = 1; /* XXXTODO SXG_RSS_CPU_COUNT(adapter); */ - IsrCount = adapter->MsiEnabled ? RssIds : 1; + IsrCount = adapter->msi_enabled ? RssIds : 1; /* * Sanity check SXG_UCODE_REGS structure definition to diff --git a/drivers/staging/sxg/sxg.h b/drivers/staging/sxg/sxg.h index e937d4b8e811..7bf0a436a8e4 100644 --- a/drivers/staging/sxg/sxg.h +++ b/drivers/staging/sxg/sxg.h @@ -676,7 +676,7 @@ struct adapter_t { u32 DumpCmdRunning:1; /* Dump command in progress */ u32 DebugRunning:1; /* AGDB debug in progress */ u32 JumboEnabled:1; /* Jumbo frames enabled */ - u32 MsiEnabled:1; /* MSI interrupt enabled */ + u32 msi_enabled:1; /* MSI interrupt enabled */ u32 RssEnabled:1; /* RSS Enabled */ u32 FailOnBadEeprom:1; /* Fail on Bad Eeprom */ u32 DiagStart:1; /* Init adapter for diagnostic start */ @@ -709,6 +709,9 @@ struct adapter_t { /* PSXG_DUMP_CMD DumpBuffer; */ /* 68k - Cmd and Buffer */ /* dma_addr_t PDumpBuffer; */ /* Physical address */ /*#endif */ /* SXG_FAILURE_DUMP */ + /*MSI-X related data elements*/ + u32 nr_msix_entries; + struct msix_entry *msi_entries; }; #if SLIC_DUMP_ENABLED