efi_open_protocol_information provides the agent and controller
handles as well as the attributes and open count of an protocol
on a handle.
Cc: Rob Clark <robdcl...@gmail.com>
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
v3:
use list_for_each_entry
correct indention
v2:
new patch
---
lib/efi_loader/efi_boottime.c | 74 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 73 insertions(+), 1 deletion(-)
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 65a7a79dc1..fa9b74d465 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -984,14 +984,86 @@ out:
return EFI_EXIT(r);
}
+static efi_status_t efi_copy_open_protocol_information(
+ struct efi_handler *protocol,
+ struct efi_open_protocol_info_entry **entry_buffer,
+ unsigned long *entry_count)
+{
+ unsigned long buffer_size;
+ unsigned long count = 0;
+ size_t i;
+ efi_status_t r;
+
+ *entry_buffer = NULL;
+
+ /* Count entries */
+ for (i = 0; i < ARRAY_SIZE(protocol->open_info); ++i) {
+ struct efi_open_protocol_info_entry *open_info =
+ &protocol->open_info[i];
+
+ if (open_info->open_count)
+ ++count;
+ }
+ *entry_count = count;
+ if (!count)
+ return EFI_SUCCESS;
+
+ /* Copy entries */
+ buffer_size = count * sizeof(struct efi_open_protocol_info_entry);
+ r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
+ (void **)entry_buffer);
+ if (r != EFI_SUCCESS)
+ return r;
+ count = 0;
+ for (i = 0; i < ARRAY_SIZE(protocol->open_info); ++i) {
+ struct efi_open_protocol_info_entry *open_info =
+ &protocol->open_info[i];
+
+ if (!open_info->open_count)
+ continue;
+ (*entry_buffer)[count] = *open_info;
+ ++count;
+ }
+
+ return EFI_SUCCESS;
+}
+
static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
efi_guid_t *protocol,
struct efi_open_protocol_info_entry **entry_buffer,
unsigned long *entry_count)
{
+ struct efi_object *efiobj;
+ size_t i;
+ efi_status_t r = EFI_NOT_FOUND;
+
EFI_ENTRY("%p, %p, %p, %p", handle, protocol, entry_buffer,
entry_count);
- return EFI_EXIT(EFI_NOT_FOUND);
+
+ if (!handle || !protocol || !entry_buffer)
+ EFI_EXIT(EFI_INVALID_PARAMETER);
+
+ EFI_PRINT_GUID("protocol:", protocol);
+
+ list_for_each_entry(efiobj, &efi_obj_list, link) {
+ if (efiobj->handle != handle)
+ continue;
+
+ for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
+ struct efi_handler *handler = &efiobj->protocols[i];
+ const efi_guid_t *hprotocol = handler->guid;
+ if (!hprotocol)
+ continue;
+ if (!guidcmp(hprotocol, protocol)) {
+ r = efi_copy_open_protocol_information(
+ handler, entry_buffer, entry_count);
+ goto out;
+ }
+ }
+ goto out;
+ }
+out:
+ return EFI_EXIT(r);
}
static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
--
2.11.0
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