forked from Minki/linux
scsi: vmw_pvscsi: switch to pci_alloc_irq_vectors
And simplify the interrupt handler by splitting the INTx case that needs to deal with shared interrupts into a separate helper. [mkp: typo fixage] Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jim Gill <jgill@vmware.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig
Martin K. Petersen
parent
223e4b93e6
commit
2e48e34911
@ -68,10 +68,7 @@ struct pvscsi_ctx {
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struct pvscsi_adapter {
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char *mmioBase;
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unsigned int irq;
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u8 rev;
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bool use_msi;
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bool use_msix;
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bool use_msg;
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bool use_req_threshold;
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@ -1161,30 +1158,26 @@ static bool pvscsi_setup_req_threshold(struct pvscsi_adapter *adapter,
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static irqreturn_t pvscsi_isr(int irq, void *devp)
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{
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struct pvscsi_adapter *adapter = devp;
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int handled;
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unsigned long flags;
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if (adapter->use_msi || adapter->use_msix)
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handled = true;
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else {
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u32 val = pvscsi_read_intr_status(adapter);
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handled = (val & PVSCSI_INTR_ALL_SUPPORTED) != 0;
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if (handled)
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pvscsi_write_intr_status(devp, val);
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}
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spin_lock_irqsave(&adapter->hw_lock, flags);
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pvscsi_process_completion_ring(adapter);
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if (adapter->use_msg && pvscsi_msg_pending(adapter))
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queue_work(adapter->workqueue, &adapter->work);
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spin_unlock_irqrestore(&adapter->hw_lock, flags);
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if (handled) {
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unsigned long flags;
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return IRQ_HANDLED;
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}
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spin_lock_irqsave(&adapter->hw_lock, flags);
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static irqreturn_t pvscsi_shared_isr(int irq, void *devp)
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{
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struct pvscsi_adapter *adapter = devp;
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u32 val = pvscsi_read_intr_status(adapter);
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pvscsi_process_completion_ring(adapter);
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if (adapter->use_msg && pvscsi_msg_pending(adapter))
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queue_work(adapter->workqueue, &adapter->work);
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spin_unlock_irqrestore(&adapter->hw_lock, flags);
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}
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return IRQ_RETVAL(handled);
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if (!(val & PVSCSI_INTR_ALL_SUPPORTED))
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return IRQ_NONE;
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pvscsi_write_intr_status(devp, val);
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return pvscsi_isr(irq, devp);
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}
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static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
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@ -1196,34 +1189,10 @@ static void pvscsi_free_sgls(const struct pvscsi_adapter *adapter)
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free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
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}
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static int pvscsi_setup_msix(const struct pvscsi_adapter *adapter,
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unsigned int *irq)
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{
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struct msix_entry entry = { 0, PVSCSI_VECTOR_COMPLETION };
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int ret;
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ret = pci_enable_msix_exact(adapter->dev, &entry, 1);
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if (ret)
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return ret;
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*irq = entry.vector;
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return 0;
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}
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static void pvscsi_shutdown_intr(struct pvscsi_adapter *adapter)
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{
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if (adapter->irq) {
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free_irq(adapter->irq, adapter);
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adapter->irq = 0;
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}
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if (adapter->use_msi) {
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pci_disable_msi(adapter->dev);
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adapter->use_msi = 0;
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} else if (adapter->use_msix) {
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pci_disable_msix(adapter->dev);
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adapter->use_msix = 0;
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}
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free_irq(pci_irq_vector(adapter->dev, 0), adapter);
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pci_free_irq_vectors(adapter->dev);
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}
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static void pvscsi_release_resources(struct pvscsi_adapter *adapter)
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@ -1359,11 +1328,11 @@ exit:
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static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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unsigned int irq_flag = PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY;
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struct pvscsi_adapter *adapter;
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struct pvscsi_adapter adapter_temp;
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struct Scsi_Host *host = NULL;
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unsigned int i;
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unsigned long flags = 0;
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int error;
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u32 max_id;
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@ -1512,30 +1481,33 @@ static int pvscsi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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goto out_reset_adapter;
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}
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if (!pvscsi_disable_msix &&
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pvscsi_setup_msix(adapter, &adapter->irq) == 0) {
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printk(KERN_INFO "vmw_pvscsi: using MSI-X\n");
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adapter->use_msix = 1;
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} else if (!pvscsi_disable_msi && pci_enable_msi(pdev) == 0) {
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printk(KERN_INFO "vmw_pvscsi: using MSI\n");
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adapter->use_msi = 1;
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adapter->irq = pdev->irq;
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} else {
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printk(KERN_INFO "vmw_pvscsi: using INTx\n");
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adapter->irq = pdev->irq;
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flags = IRQF_SHARED;
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}
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if (pvscsi_disable_msix)
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irq_flag &= ~PCI_IRQ_MSIX;
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if (pvscsi_disable_msi)
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irq_flag &= ~PCI_IRQ_MSI;
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error = pci_alloc_irq_vectors(adapter->dev, 1, 1, irq_flag);
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if (error)
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goto out_reset_adapter;
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adapter->use_req_threshold = pvscsi_setup_req_threshold(adapter, true);
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printk(KERN_DEBUG "vmw_pvscsi: driver-based request coalescing %sabled\n",
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adapter->use_req_threshold ? "en" : "dis");
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error = request_irq(adapter->irq, pvscsi_isr, flags,
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"vmw_pvscsi", adapter);
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if (adapter->dev->msix_enabled || adapter->dev->msi_enabled) {
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printk(KERN_INFO "vmw_pvscsi: using MSI%s\n",
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adapter->dev->msix_enabled ? "-X" : "");
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error = request_irq(pci_irq_vector(pdev, 0), pvscsi_isr,
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0, "vmw_pvscsi", adapter);
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} else {
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printk(KERN_INFO "vmw_pvscsi: using INTx\n");
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error = request_irq(pci_irq_vector(pdev, 0), pvscsi_shared_isr,
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IRQF_SHARED, "vmw_pvscsi", adapter);
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}
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if (error) {
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printk(KERN_ERR
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"vmw_pvscsi: unable to request IRQ: %d\n", error);
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adapter->irq = 0;
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goto out_reset_adapter;
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}
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@ -422,11 +422,6 @@ struct PVSCSIConfigPageController {
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*/
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#define PVSCSI_MAX_INTRS 24
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/*
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* Enumeration of supported MSI-X vectors
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*/
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#define PVSCSI_VECTOR_COMPLETION 0
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/*
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* Misc constants for the rings.
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*/
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