[U-Boot] [PATCH 07/16] efi_loader: implement OpenProtocolInformation

[Heinrich Schuchardt]

efi_open_protocol_information provides the agent and controller
handles as well as the attributes and open count of an protocol
on a handle.

Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
 lib/efi_loader/efi_boottime.c | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index a527e33141..44c9da0a7c 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1722,9 +1722,48 @@ static efi_status_t EFIAPI 
efi_open_protocol_information(efi_handle_t handle,
                        struct efi_open_protocol_info_entry **entry_buffer,
                        efi_uintn_t *entry_count)
 {
+       unsigned long buffer_size;
+       unsigned long count;
+       struct efi_handler *handler;
+       struct efi_open_protocol_info_item *item;
+       efi_status_t r;
+
        EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
                  entry_count);
-       return EFI_EXIT(EFI_NOT_FOUND);
+
+       /* Check parameters */
+       if (!entry_buffer) {
+               r = EFI_INVALID_PARAMETER;
+               goto out;
+       }
+       r = efi_search_protocol(handle, protocol, &handler);
+       if (r != EFI_SUCCESS)
+               goto out;
+
+       /* Count entries */
+       count = 0;
+       list_for_each_entry(item, &handler->open_infos, link) {
+               ++count;
+       }
+       *entry_count = count;
+       *entry_buffer = NULL;
+       if (!count) {
+               r = EFI_SUCCESS;
+               goto out;
+       }
+
+       /* 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)
+               goto out;
+       list_for_each_entry_reverse(item, &handler->open_infos, link) {
+               if (item->info.open_count)
+                       (*entry_buffer)[--count] = item->info;
+       }
+out:
+       return EFI_EXIT(r);
 }
 
 /*
-- 
2.14.2

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