diff options
Diffstat (limited to 'drivers/firmware/efi/libstub/efi-stub-helper.c')
| -rw-r--r-- | drivers/firmware/efi/libstub/efi-stub-helper.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c index fcc45ee94e02..74ddfb496140 100644 --- a/drivers/firmware/efi/libstub/efi-stub-helper.c +++ b/drivers/firmware/efi/libstub/efi-stub-helper.c @@ -33,6 +33,8 @@ static bool __efistub_global efi_nokaslr; static bool __efistub_global efi_quiet; static bool __efistub_global efi_novamap; static bool __efistub_global efi_nosoftreserve; +static bool __efistub_global efi_disable_pci_dma = + IS_ENABLED(CONFIG_EFI_DISABLE_PCI_DMA); bool __pure nokaslr(void) { @@ -490,6 +492,16 @@ efi_status_t efi_parse_options(char const *cmdline) efi_nosoftreserve = true; } + if (!strncmp(str, "disable_early_pci_dma", 21)) { + str += strlen("disable_early_pci_dma"); + efi_disable_pci_dma = true; + } + + if (!strncmp(str, "no_disable_early_pci_dma", 24)) { + str += strlen("no_disable_early_pci_dma"); + efi_disable_pci_dma = false; + } + /* Group words together, delimited by "," */ while (*str && *str != ' ' && *str != ',') str++; @@ -876,6 +888,9 @@ efi_status_t efi_exit_boot_services(void *handle, if (status != EFI_SUCCESS) goto free_map; + if (efi_disable_pci_dma) + efi_pci_disable_bridge_busmaster(); + status = efi_bs_call(exit_boot_services, handle, *map->key_ptr); if (status == EFI_INVALID_PARAMETER) { |