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| 1 | +/* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | +/* |
| 3 | + * Minimal wrappers to allow compiling igb_uio on older kernels. |
| 4 | + */ |
| 5 | + |
| 6 | +#ifndef RHEL_RELEASE_VERSION |
| 7 | +#define RHEL_RELEASE_VERSION(a, b) (((a) << 8) + (b)) |
| 8 | +#endif |
| 9 | + |
| 10 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0) |
| 11 | +#define pci_cfg_access_lock pci_block_user_cfg_access |
| 12 | +#define pci_cfg_access_unlock pci_unblock_user_cfg_access |
| 13 | +#endif |
| 14 | + |
| 15 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0) |
| 16 | +#define HAVE_PTE_MASK_PAGE_IOMAP |
| 17 | +#endif |
| 18 | + |
| 19 | +#ifndef PCI_MSIX_ENTRY_SIZE |
| 20 | +#define PCI_MSIX_ENTRY_SIZE 16 |
| 21 | +#define PCI_MSIX_ENTRY_VECTOR_CTRL 12 |
| 22 | +#define PCI_MSIX_ENTRY_CTRL_MASKBIT 1 |
| 23 | +#endif |
| 24 | + |
| 25 | +/* |
| 26 | + * for kernels < 2.6.38 and backported patch that moves MSI-X entry definition |
| 27 | + * to pci_regs.h Those kernels has PCI_MSIX_ENTRY_SIZE defined but not |
| 28 | + * PCI_MSIX_ENTRY_CTRL_MASKBIT |
| 29 | + */ |
| 30 | +#ifndef PCI_MSIX_ENTRY_CTRL_MASKBIT |
| 31 | +#define PCI_MSIX_ENTRY_CTRL_MASKBIT 1 |
| 32 | +#endif |
| 33 | + |
| 34 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34) && \ |
| 35 | + (!(defined(RHEL_RELEASE_CODE) && \ |
| 36 | + RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(5, 9))) |
| 37 | + |
| 38 | +static int pci_num_vf(struct pci_dev *dev) |
| 39 | +{ |
| 40 | + struct iov { |
| 41 | + int pos; |
| 42 | + int nres; |
| 43 | + u32 cap; |
| 44 | + u16 ctrl; |
| 45 | + u16 total; |
| 46 | + u16 initial; |
| 47 | + u16 nr_virtfn; |
| 48 | + } *iov = (struct iov *)dev->sriov; |
| 49 | + |
| 50 | + if (!dev->is_physfn) |
| 51 | + return 0; |
| 52 | + |
| 53 | + return iov->nr_virtfn; |
| 54 | +} |
| 55 | + |
| 56 | +#endif /* < 2.6.34 */ |
| 57 | + |
| 58 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) && \ |
| 59 | + (!(defined(RHEL_RELEASE_CODE) && \ |
| 60 | + RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(6, 4))) |
| 61 | + |
| 62 | +#define kstrtoul strict_strtoul |
| 63 | + |
| 64 | +#endif /* < 2.6.39 */ |
| 65 | + |
| 66 | +#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0) && \ |
| 67 | + (!(defined(RHEL_RELEASE_CODE) && \ |
| 68 | + RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(6, 3))) |
| 69 | + |
| 70 | +/* Check if INTX works to control irq's. |
| 71 | + * Set's INTX_DISABLE flag and reads it back |
| 72 | + */ |
| 73 | +static bool pci_intx_mask_supported(struct pci_dev *pdev) |
| 74 | +{ |
| 75 | + bool mask_supported = false; |
| 76 | + uint16_t orig, new; |
| 77 | + |
| 78 | + pci_block_user_cfg_access(pdev); |
| 79 | + pci_read_config_word(pdev, PCI_COMMAND, &orig); |
| 80 | + pci_write_config_word(pdev, PCI_COMMAND, |
| 81 | + orig ^ PCI_COMMAND_INTX_DISABLE); |
| 82 | + pci_read_config_word(pdev, PCI_COMMAND, &new); |
| 83 | + |
| 84 | + if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) { |
| 85 | + dev_err(&pdev->dev, "Command register changed from " |
| 86 | + "0x%x to 0x%x: driver or hardware bug?\n", orig, new); |
| 87 | + } else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) { |
| 88 | + mask_supported = true; |
| 89 | + pci_write_config_word(pdev, PCI_COMMAND, orig); |
| 90 | + } |
| 91 | + pci_unblock_user_cfg_access(pdev); |
| 92 | + |
| 93 | + return mask_supported; |
| 94 | +} |
| 95 | + |
| 96 | +static bool pci_check_and_mask_intx(struct pci_dev *pdev) |
| 97 | +{ |
| 98 | + bool pending; |
| 99 | + uint32_t status; |
| 100 | + |
| 101 | + pci_block_user_cfg_access(pdev); |
| 102 | + pci_read_config_dword(pdev, PCI_COMMAND, &status); |
| 103 | + |
| 104 | + /* interrupt is not ours, goes to out */ |
| 105 | + pending = (((status >> 16) & PCI_STATUS_INTERRUPT) != 0); |
| 106 | + if (pending) { |
| 107 | + uint16_t old, new; |
| 108 | + |
| 109 | + old = status; |
| 110 | + if (status != 0) |
| 111 | + new = old & (~PCI_COMMAND_INTX_DISABLE); |
| 112 | + else |
| 113 | + new = old | PCI_COMMAND_INTX_DISABLE; |
| 114 | + |
| 115 | + if (old != new) |
| 116 | + pci_write_config_word(pdev, PCI_COMMAND, new); |
| 117 | + } |
| 118 | + pci_unblock_user_cfg_access(pdev); |
| 119 | + |
| 120 | + return pending; |
| 121 | +} |
| 122 | + |
| 123 | +#endif /* < 3.3.0 */ |
| 124 | + |
| 125 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0) |
| 126 | +#define HAVE_PCI_IS_BRIDGE_API 1 |
| 127 | +#endif |
| 128 | + |
| 129 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 3, 0) |
| 130 | +#define HAVE_MSI_LIST_IN_GENERIC_DEVICE 1 |
| 131 | +#endif |
| 132 | + |
| 133 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0) |
| 134 | +#define HAVE_PCI_MSI_MASK_IRQ 1 |
| 135 | +#endif |
| 136 | + |
| 137 | +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0) |
| 138 | +#define HAVE_ALLOC_IRQ_VECTORS 1 |
| 139 | +#endif |
| 140 | + |
| 141 | +static inline bool igbuio_kernel_is_locked_down(void) |
| 142 | +{ |
| 143 | +#ifdef CONFIG_LOCK_DOWN_KERNEL |
| 144 | +#ifdef CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT |
| 145 | + return kernel_is_locked_down(NULL); |
| 146 | +#elif defined(CONFIG_EFI_SECURE_BOOT_LOCK_DOWN) |
| 147 | + return kernel_is_locked_down(); |
| 148 | +#else |
| 149 | + return false; |
| 150 | +#endif |
| 151 | +#else |
| 152 | + return false; |
| 153 | +#endif |
| 154 | +} |
| 155 | + |
| 156 | +#ifndef fallthrough |
| 157 | + |
| 158 | +#ifndef __has_attribute |
| 159 | +#define __has_attribute(x) 0 |
| 160 | +#endif |
| 161 | + |
| 162 | +#if __has_attribute(__fallthrough__) |
| 163 | +#define fallthrough __attribute__((__fallthrough__)) |
| 164 | +#else |
| 165 | +#define fallthrough do {} while (0) /* fallthrough */ |
| 166 | +#endif |
| 167 | + |
| 168 | +#endif |
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