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efi_loader: open_info in OpenProtocol

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efi_open_protocol has to keep track of opened protocols.

OpenProtocol enters the agent and controller handle
information into this list.

A unit test is supplied with a subsequent patch.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2018-01-11 08:15:58 +01:00 committed by Alexander Graf
parent fe1599daf5
commit 191a41cc32
1 changed files with 103 additions and 4 deletions
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107
lib/efi_loader/efi_boottime.c
View file

@ -2120,6 +2120,101 @@ static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
EFI_EXIT(EFI_SUCCESS);
}
/*
* Open protocol interface on a handle.
*
* @handler handler of a protocol
* @protocol_interface interface implementing the protocol
* @agent_handle handle of the driver
* @controller_handle handle of the controller
* @attributes attributes indicating how to open the protocol
* @return status code
*/
static efi_status_t efi_protocol_open(
struct efi_handler *handler,
void **protocol_interface, void *agent_handle,
void *controller_handle, uint32_t attributes)
{
struct efi_open_protocol_info_item *item;
struct efi_open_protocol_info_entry *match = NULL;
bool opened_by_driver = false;
bool opened_exclusive = false;
/* If there is no agent, only return the interface */
if (!agent_handle)
goto out;
/* For TEST_PROTOCOL ignore interface attribute */
if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
*protocol_interface = NULL;
/*
* Check if the protocol is already opened by a driver with the same
* attributes or opened exclusively
*/
list_for_each_entry(item, &handler->open_infos, link) {
if (item->info.agent_handle == agent_handle) {
if ((attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) &&
(item->info.attributes == attributes))
return EFI_ALREADY_STARTED;
}
if (item->info.attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE)
opened_exclusive = true;
}
/* Only one controller can open the protocol exclusively */
if (opened_exclusive && attributes &
(EFI_OPEN_PROTOCOL_EXCLUSIVE | EFI_OPEN_PROTOCOL_BY_DRIVER))
return EFI_ACCESS_DENIED;
/* Prepare exclusive opening */
if (attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE) {
/* Try to disconnect controllers */
list_for_each_entry(item, &handler->open_infos, link) {
if (item->info.attributes ==
EFI_OPEN_PROTOCOL_BY_DRIVER)
EFI_CALL(efi_disconnect_controller(
item->info.controller_handle,
item->info.agent_handle,
NULL));
}
opened_by_driver = false;
/* Check if all controllers are disconnected */
list_for_each_entry(item, &handler->open_infos, link) {
if (item->info.attributes & EFI_OPEN_PROTOCOL_BY_DRIVER)
opened_by_driver = true;
}
/* Only one controller can be conncected */
if (opened_by_driver)
return EFI_ACCESS_DENIED;
}
/* Find existing entry */
list_for_each_entry(item, &handler->open_infos, link) {
if (item->info.agent_handle == agent_handle &&
item->info.controller_handle == controller_handle)
match = &item->info;
}
/* None found, create one */
if (!match) {
match = efi_create_open_info(handler);
if (!match)
return EFI_OUT_OF_RESOURCES;
}
match->agent_handle = agent_handle;
match->controller_handle = controller_handle;
match->attributes = attributes;
match->open_count++;
out:
/* For TEST_PROTOCOL ignore interface attribute. */
if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
*protocol_interface = handler->protocol_interface;
return EFI_SUCCESS;
}
/*
* Open protocol interface on a handle.
*
@ -2161,12 +2256,16 @@ static efi_status_t EFIAPI efi_open_protocol(
case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
if (controller_handle == handle)
goto out;
/* fall-through */
case EFI_OPEN_PROTOCOL_BY_DRIVER:
case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
if (controller_handle == NULL)
/* Check that the controller handle is valid */
if (!efi_search_obj(controller_handle))
goto out;
/* fall-through */
case EFI_OPEN_PROTOCOL_EXCLUSIVE:
if (agent_handle == NULL)
/* Check that the agent handle is valid */
if (!efi_search_obj(agent_handle))
goto out;
break;
default:
@ -2177,8 +2276,8 @@ static efi_status_t EFIAPI efi_open_protocol(
if (r != EFI_SUCCESS)
goto out;
if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
*protocol_interface = handler->protocol_interface;
r = efi_protocol_open(handler, protocol_interface, agent_handle,
controller_handle, attributes);
out:
return EFI_EXIT(r);
}