projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 30edc14b KRW |
1 | /* |
| 2 | * PCI Backend -- Configuration overlay for MSI capability | |
| 3 | */ | |
| 4 | #include <linux/pci.h> | |
| 5 | #include <linux/slab.h> | |
| 6 | #include "conf_space.h" | |
| 7 | #include "conf_space_capability.h" | |
| 8 | #include <xen/interface/io/pciif.h> | |
| 9 | #include <xen/events.h> | |
| 10 | #include "pciback.h" | |
| 11 | ||
| 12 | int pciback_enable_msi(struct pciback_device *pdev, | |
| 13 | struct pci_dev *dev, struct xen_pci_op *op) | |
| 14 | { | |
| 0513fe9e | 15 | struct pciback_dev_data *dev_data; |
| 30edc14b KRW |
16 | int otherend = pdev->xdev->otherend_id; |
| 17 | int status; | |
| 18 | ||
| 19 | status = pci_enable_msi(dev); | |
| 20 | ||
| 21 | if (status) { | |
| 22 | printk(KERN_ERR "error enable msi for guest %x status %x\n", | |
| 23 | otherend, status); | |
| 24 | op->value = 0; | |
| 25 | return XEN_PCI_ERR_op_failed; | |
| 26 | } | |
| 27 | ||
| 28 | /* The value the guest needs is actually the IDT vector, not the | |
| 29 | * the local domain's IRQ number. */ | |
| 30 | ||
| 31 | op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0; | |
| 0513fe9e KRW |
32 | dev_data = pci_get_drvdata(dev); |
| 33 | if (dev_data) | |
| 34 | dev_data->ack_intr = 0; | |
| 30edc14b KRW |
35 | return 0; |
| 36 | } | |
| 37 | ||
| 38 | int pciback_disable_msi(struct pciback_device *pdev, | |
| 39 | struct pci_dev *dev, struct xen_pci_op *op) | |
| 40 | { | |
| 0513fe9e | 41 | struct pciback_dev_data *dev_data; |
| 30edc14b KRW |
42 | pci_disable_msi(dev); |
| 43 | ||
| 44 | op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0; | |
| 0513fe9e KRW |
45 | dev_data = pci_get_drvdata(dev); |
| 46 | if (dev_data) | |
| 47 | dev_data->ack_intr = 1; | |
| 30edc14b KRW |
48 | return 0; |
| 49 | } | |
| 50 | ||
| 51 | int pciback_enable_msix(struct pciback_device *pdev, | |
| 52 | struct pci_dev *dev, struct xen_pci_op *op) | |
| 53 | { | |
| 0513fe9e | 54 | struct pciback_dev_data *dev_data; |
| 30edc14b KRW |
55 | int i, result; |
| 56 | struct msix_entry *entries; | |
| 57 | ||
| 58 | if (op->value > SH_INFO_MAX_VEC) | |
| 59 | return -EINVAL; | |
| 60 | ||
| 61 | entries = kmalloc(op->value * sizeof(*entries), GFP_KERNEL); | |
| 62 | if (entries == NULL) | |
| 63 | return -ENOMEM; | |
| 64 | ||
| 65 | for (i = 0; i < op->value; i++) { | |
| 66 | entries[i].entry = op->msix_entries[i].entry; | |
| 67 | entries[i].vector = op->msix_entries[i].vector; | |
| 68 | } | |
| 69 | ||
| 70 | result = pci_enable_msix(dev, entries, op->value); | |
| 71 | ||
| 72 | if (result == 0) { | |
| 73 | for (i = 0; i < op->value; i++) { | |
| 74 | op->msix_entries[i].entry = entries[i].entry; | |
| 75 | if (entries[i].vector) | |
| 76 | op->msix_entries[i].vector = | |
| 77 | xen_pirq_from_irq(entries[i].vector); | |
| 78 | } | |
| 79 | } else { | |
| 80 | printk(KERN_WARNING "pciback: %s: failed to enable MSI-X: err %d!\n", | |
| 81 | pci_name(dev), result); | |
| 82 | } | |
| 83 | kfree(entries); | |
| 84 | ||
| 85 | op->value = result; | |
| 0513fe9e KRW |
86 | dev_data = pci_get_drvdata(dev); |
| 87 | if (dev_data) | |
| 88 | dev_data->ack_intr = 0; | |
| 30edc14b KRW |
89 | |
| 90 | return result; | |
| 91 | } | |
| 92 | ||
| 93 | int pciback_disable_msix(struct pciback_device *pdev, | |
| 94 | struct pci_dev *dev, struct xen_pci_op *op) | |
| 95 | { | |
| 0513fe9e | 96 | struct pciback_dev_data *dev_data; |
| 30edc14b KRW |
97 | |
| 98 | pci_disable_msix(dev); | |
| 99 | ||
| 100 | /* | |
| 101 | * SR-IOV devices (which don't have any legacy IRQ) have | |
| 102 | * an undefined IRQ value of zero. | |
| 103 | */ | |
| 104 | op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0; | |
| 0513fe9e KRW |
105 | dev_data = pci_get_drvdata(dev); |
| 106 | if (dev_data) | |
| 107 | dev_data->ack_intr = 1; | |
| 108 | ||
| 30edc14b KRW |
109 | return 0; |
| 110 | } | |
| 111 |