[U-Boot,v2,3/3] efi_loader: implement OpenProtocolInformation

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.glpk@gmx.de>
---
v2:
	new patch
---
 lib/efi_loader/efi_boottime.c | 77 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 76 insertions(+), 1 deletion(-)

On Sat, Aug 5, 2017 at 12:58 PM, Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
> 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.glpk@gmx.de>
> ---
> v2:
>         new patch
> ---
>  lib/efi_loader/efi_boottime.c | 77 ++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 76 insertions(+), 1 deletion(-)
>
> diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
> index 65a7a79dc1..941d07192d 100644
> --- a/lib/efi_loader/efi_boottime.c
> +++ b/lib/efi_loader/efi_boottime.c
> @@ -984,14 +984,89 @@ 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;

looks like something went awry with the indentation here?

(btw, one could wish UEFI was more consistent with caller vs callee
allocations... sigh..)

> +       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;
> +       struct list_head *lhandle;
> +       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(lhandle, &efi_obj_list) {
> +               efiobj = list_entry(lhandle, struct efi_object, link);

list_for_each_entry()?

with those minor nits addressed, you can add my r-b

BR,
-R


> +
> +               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
>