Re: [PATCH 2/2 v2] efi_loader: Disable devices before handing over control
On 10/22/20 12:04 AM, Ilias Apalodimas wrote: > U-Boot Driver Model is supposed to remove devices with either > DM_REMOVE_ACTIVE_DMA or DM_REMOVE_OS_PREPARE flags set, before exiting. > Our bootm command does that by explicitly calling calling > "dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);" and we also disable any > USB devices. > > The EFI equivalent is doing none of those at the moment. As a result > probing an fTPM driver now renders it unusable in Linux. During our > (*probe) callback we open a session with OP-TEE, which is supposed to > close with our (*remove) callback. Since the (*remove) is never called, > once we boot into Linux and try to probe the device again we are getting > a busy error response. Moreover all uclass (*preremove) functions won't > run. > > So let's fix this by mimicking what bootm does and disconnect devices > when efi_exit_boot_services() is called. > > Signed-off-by: Ilias Apalodimas Reviewed-by: Heinrich Schuchardt
Re: [PATCH 2/2 v2] efi_loader: Disable devices before handing over control
+cc Mark On Thu, 22 Oct 2020 at 01:04, Ilias Apalodimas wrote: > > U-Boot Driver Model is supposed to remove devices with either > DM_REMOVE_ACTIVE_DMA or DM_REMOVE_OS_PREPARE flags set, before exiting. > Our bootm command does that by explicitly calling calling > "dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);" and we also disable any > USB devices. > > The EFI equivalent is doing none of those at the moment. As a result > probing an fTPM driver now renders it unusable in Linux. During our > (*probe) callback we open a session with OP-TEE, which is supposed to > close with our (*remove) callback. Since the (*remove) is never called, > once we boot into Linux and try to probe the device again we are getting > a busy error response. Moreover all uclass (*preremove) functions won't > run. > > So let's fix this by mimicking what bootm does and disconnect devices > when efi_exit_boot_services() is called. > > Signed-off-by: Ilias Apalodimas > --- > changes since v1: > - Add a patch sorting the .h files inclusions > - Fix compilation errors for sandbox_spl_defconfig > - TravisCI: https://travis-ci.com/github/apalos/u-boot/builds/191447335 > lib/efi_loader/efi_boottime.c | 6 ++ > 1 file changed, 6 insertions(+) > > diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c > index 2896c3ea5aa8..b26ac9fbfc79 100644 > --- a/lib/efi_loader/efi_boottime.c > +++ b/lib/efi_loader/efi_boottime.c > @@ -8,6 +8,8 @@ > #include > #include > #include > +#include > +#include > #include > #include > #include > @@ -15,6 +17,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -1993,7 +1996,10 @@ static efi_status_t EFIAPI > efi_exit_boot_services(efi_handle_t image_handle, > list_del(>link); > } > > + if IS_ENABLED(CONFIG_USB_DEVICE) > + udc_disconnect(); > board_quiesce_devices(); > + dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL); > > /* Patch out unsupported runtime function */ > efi_runtime_detach(); > -- > 2.28.0 >
[PATCH 2/2 v2] efi_loader: Disable devices before handing over control
U-Boot Driver Model is supposed to remove devices with either DM_REMOVE_ACTIVE_DMA or DM_REMOVE_OS_PREPARE flags set, before exiting. Our bootm command does that by explicitly calling calling "dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);" and we also disable any USB devices. The EFI equivalent is doing none of those at the moment. As a result probing an fTPM driver now renders it unusable in Linux. During our (*probe) callback we open a session with OP-TEE, which is supposed to close with our (*remove) callback. Since the (*remove) is never called, once we boot into Linux and try to probe the device again we are getting a busy error response. Moreover all uclass (*preremove) functions won't run. So let's fix this by mimicking what bootm does and disconnect devices when efi_exit_boot_services() is called. Signed-off-by: Ilias Apalodimas --- changes since v1: - Add a patch sorting the .h files inclusions - Fix compilation errors for sandbox_spl_defconfig - TravisCI: https://travis-ci.com/github/apalos/u-boot/builds/191447335 lib/efi_loader/efi_boottime.c | 6 ++ 1 file changed, 6 insertions(+) diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index 2896c3ea5aa8..b26ac9fbfc79 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -8,6 +8,8 @@ #include #include #include +#include +#include #include #include #include @@ -15,6 +17,7 @@ #include #include #include +#include #include #include @@ -1993,7 +1996,10 @@ static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle, list_del(>link); } + if IS_ENABLED(CONFIG_USB_DEVICE) + udc_disconnect(); board_quiesce_devices(); + dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL); /* Patch out unsupported runtime function */ efi_runtime_detach(); -- 2.28.0
