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/* 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
}
#ifndef fallthrough
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
#if __has_attribute(__fallthrough__)
#define fallthrough __attribute__((__fallthrough__))
#else
#define fallthrough do {} while (0) /* fallthrough */
#endif
#endif
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