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Subject[PATCH 07/25] efi/libstub: use a helper to iterate over a EFI handle array
Date
Iterating over a EFI handle array is a bit finicky, since we have
to take mixed mode into account, where handles are only 32-bit
while the native efi_handle_t type is 64-bit.

So introduce a helper, and replace the various occurrences of
this pattern.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/boot/compressed/eboot.c | 14 +++++---------
drivers/firmware/efi/libstub/gop.c | 9 ++-------
include/linux/efi.h | 13 +++++++++++++
3 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 72b08fde6de6..959bcdd8c1fe 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -135,6 +135,7 @@ static void setup_efi_pci(struct boot_params *params)
unsigned long size = 0;
unsigned long nr_pci;
struct setup_data *data;
+ efi_handle_t h;
int i;

status = efi_call_early(locate_handle,
@@ -164,14 +165,11 @@ static void setup_efi_pci(struct boot_params *params)
while (data && data->next)
data = (struct setup_data *)(unsigned long)data->next;

- nr_pci = size / (efi_is_64bit() ? sizeof(u64) : sizeof(u32));
- for (i = 0; i < nr_pci; i++) {
+ for_each_efi_handle(h, pci_handle, size, i) {
efi_pci_io_protocol_t *pci = NULL;
struct pci_setup_rom *rom;

- status = efi_call_early(handle_protocol,
- efi_is_64bit() ? ((u64 *)pci_handle)[i]
- : ((u32 *)pci_handle)[i],
+ status = efi_call_early(handle_protocol, h,
&pci_proto, (void **)&pci);
if (status != EFI_SUCCESS || !pci)
continue;
@@ -266,6 +264,7 @@ setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
void **uga_handle = NULL;
efi_uga_draw_protocol_t *uga = NULL, *first_uga;
unsigned long nr_ugas;
+ efi_handle_t handle;
int i;

status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
@@ -283,13 +282,10 @@ setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
width = 0;

first_uga = NULL;
- nr_ugas = size / (efi_is_64bit() ? sizeof(u64) : sizeof(u32));
- for (i = 0; i < nr_ugas; i++) {
+ for_each_efi_handle(handle, uga_handle, size, i) {
efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
u32 w, h, depth, refresh;
void *pciio;
- unsigned long handle = efi_is_64bit() ? ((u64 *)uga_handle)[i]
- : ((u32 *)uga_handle)[i];

status = efi_call_early(handle_protocol, handle,
uga_proto, (void **)&uga);
diff --git a/drivers/firmware/efi/libstub/gop.c b/drivers/firmware/efi/libstub/gop.c
index 94045ab7dd3d..5f4fbc2ac687 100644
--- a/drivers/firmware/efi/libstub/gop.c
+++ b/drivers/firmware/efi/libstub/gop.c
@@ -91,7 +91,6 @@ setup_gop(efi_system_table_t *sys_table_arg, struct screen_info *si,
efi_guid_t *proto, unsigned long size, void **handles)
{
efi_graphics_output_protocol_t *gop, *first_gop;
- unsigned long nr_gops;
u16 width, height;
u32 pixels_per_scan_line;
u32 ext_lfb_base;
@@ -99,22 +98,18 @@ setup_gop(efi_system_table_t *sys_table_arg, struct screen_info *si,
efi_pixel_bitmask_t pixel_info;
int pixel_format;
efi_status_t status;
+ efi_handle_t h;
int i;
- bool is64 = efi_is_64bit();

first_gop = NULL;
gop = NULL;

- nr_gops = size / (is64 ? sizeof(u64) : sizeof(u32));
- for (i = 0; i < nr_gops; i++) {
+ for_each_efi_handle(h, handles, size, i) {
efi_graphics_output_protocol_mode_t *mode;
efi_graphics_output_mode_info_t *info = NULL;
efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
bool conout_found = false;
void *dummy = NULL;
- efi_handle_t h = (efi_handle_t)(unsigned long)
- (is64 ? ((u64 *)handles)[i]
- : ((u32 *)handles)[i]);
efi_physical_addr_t current_fb_base;

status = efi_call_early(handle_protocol, h,
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 561db9deedae..8d267715ce22 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -48,6 +48,19 @@ typedef u16 efi_char16_t; /* UNICODE character */
typedef u64 efi_physical_addr_t;
typedef void *efi_handle_t;

+#define efi_get_handle_at(array, idx) \
+ (efi_is_64bit() ? (efi_handle_t)(unsigned long)((u64 *)(array))[idx] \
+ : (efi_handle_t)(unsigned long)((u32 *)(array))[idx])
+
+#define efi_get_handle_num(size) \
+ ((size) / (efi_is_64bit() ? sizeof(u64) : sizeof(u32)))
+
+#define for_each_efi_handle(handle, array, size, i) \
+ for (i = 0; \
+ i < efi_get_handle_num(size) && \
+ ((handle = efi_get_handle_at((array), i)) || true); \
+ i++)
+
/*
* The UEFI spec and EDK2 reference implementation both define EFI_GUID as
* struct { u32 a; u16; b; u16 c; u8 d[8]; }; and so the implied alignment
--
2.20.1
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