1 files changed, 154 insertions, 0 deletions
diff --git a/kernel/linux/igb_uio/compat.h b/kernel/linux/igb_uio/compat.h
new file mode 100644
index 00000000..8dbb896a
--- /dev/null
+++ b/kernel/linux/igb_uio/compat.h
@@ -0,0 +1,154 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Minimal wrappers to allow compiling igb_uio on older kernels.
+ */
+
+#ifndef RHEL_RELEASE_VERSION
+#define RHEL_RELEASE_VERSION(a, b) (((a) << 8) + (b))
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0)
+#define pci_cfg_access_lock   pci_block_user_cfg_access
+#define pci_cfg_access_unlock pci_unblock_user_cfg_access
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
+#define HAVE_PTE_MASK_PAGE_IOMAP
+#endif
+
+#ifndef PCI_MSIX_ENTRY_SIZE
+#define PCI_MSIX_ENTRY_SIZE            16
+#define PCI_MSIX_ENTRY_VECTOR_CTRL     12
+#define PCI_MSIX_ENTRY_CTRL_MASKBIT    1
+#endif
+
+/*
+ * for kernels < 2.6.38 and backported patch that moves MSI-X entry definition
+ * to pci_regs.h Those kernels has PCI_MSIX_ENTRY_SIZE defined but not
+ * PCI_MSIX_ENTRY_CTRL_MASKBIT
+ */
+#ifndef PCI_MSIX_ENTRY_CTRL_MASKBIT
+#define PCI_MSIX_ENTRY_CTRL_MASKBIT    1
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34) && \
+	(!(defined(RHEL_RELEASE_CODE) && \
+	 RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(5, 9)))
+
+static int pci_num_vf(struct pci_dev *dev)
+{
+	struct iov {
+		int pos;
+		int nres;
+		u32 cap;
+		u16 ctrl;
+		u16 total;
+		u16 initial;
+		u16 nr_virtfn;
+	} *iov = (struct iov *)dev->sriov;
+
+	if (!dev->is_physfn)
+		return 0;
+
+	return iov->nr_virtfn;
+}
+
+#endif /* < 2.6.34 */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39) && \
+	(!(defined(RHEL_RELEASE_CODE) && \
+	   RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(6, 4)))
+
+#define kstrtoul strict_strtoul
+
+#endif /* < 2.6.39 */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 3, 0) && \
+	(!(defined(RHEL_RELEASE_CODE) && \
+	   RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(6, 3)))
+
+/* Check if INTX works to control irq's.
+ * Set's INTX_DISABLE flag and reads it back
+ */
+static bool pci_intx_mask_supported(struct pci_dev *pdev)
+{
+	bool mask_supported = false;
+	uint16_t orig, new;
+
+	pci_block_user_cfg_access(pdev);
+	pci_read_config_word(pdev, PCI_COMMAND, &orig);
+	pci_write_config_word(pdev, PCI_COMMAND,
+			      orig ^ PCI_COMMAND_INTX_DISABLE);
+	pci_read_config_word(pdev, PCI_COMMAND, &new);
+
+	if ((new ^ orig) & ~PCI_COMMAND_INTX_DISABLE) {
+		dev_err(&pdev->dev, "Command register changed from "
+			"0x%x to 0x%x: driver or hardware bug?\n", orig, new);
+	} else if ((new ^ orig) & PCI_COMMAND_INTX_DISABLE) {
+		mask_supported = true;
+		pci_write_config_word(pdev, PCI_COMMAND, orig);
+	}
+	pci_unblock_user_cfg_access(pdev);
+
+	return mask_supported;
+}
+
+static bool pci_check_and_mask_intx(struct pci_dev *pdev)
+{
+	bool pending;
+	uint32_t status;
+
+	pci_block_user_cfg_access(pdev);
+	pci_read_config_dword(pdev, PCI_COMMAND, &status);
+
+	/* interrupt is not ours, goes to out */
+	pending = (((status >> 16) & PCI_STATUS_INTERRUPT) != 0);
+	if (pending) {
+		uint16_t old, new;
+
+		old = status;
+		if (status != 0)
+			new = old & (~PCI_COMMAND_INTX_DISABLE);
+		else
+			new = old | PCI_COMMAND_INTX_DISABLE;
+
+		if (old != new)
+			pci_write_config_word(pdev, PCI_COMMAND, new);
+	}
+	pci_unblock_user_cfg_access(pdev);
+
+	return pending;
+}
+
+#endif /* < 3.3.0 */
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
+#define HAVE_PCI_IS_BRIDGE_API 1
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 3, 0)
+#define HAVE_MSI_LIST_IN_GENERIC_DEVICE 1
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
+#define HAVE_PCI_MSI_MASK_IRQ 1
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0)
+#define HAVE_ALLOC_IRQ_VECTORS 1
+#endif
+
+static inline bool igbuio_kernel_is_locked_down(void)
+{
+#ifdef CONFIG_LOCK_DOWN_KERNEL
+#ifdef CONFIG_LOCK_DOWN_IN_EFI_SECURE_BOOT
+	return kernel_is_locked_down(NULL);
+#elif defined(CONFIG_EFI_SECURE_BOOT_LOCK_DOWN)
+	return kernel_is_locked_down();
+#else
+	return false;
+#endif
+#else
+	return false;
+#endif
+}