lkml.org 
[lkml]   [2022]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V4 1/1] riscv/efi_stub: Add support for RISCV_EFI_BOOT_PROTOCOL
Date
This patch adds the support for getting the boot hart ID in
Linux EFI stub using RISCV_EFI_BOOT_PROTOCOL. This protocol
is preferred method over existing DT based solution since it
works irrespective of DT or ACPI.

The specification of the protocol is hosted at:
https://github.com/riscv-non-isa/riscv-uefi

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
---
drivers/firmware/efi/libstub/efistub.h | 7 ++++++
drivers/firmware/efi/libstub/riscv-stub.c | 29 +++++++++++++++++++----
include/linux/efi.h | 1 +
3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index edb77b0621ea..aced62a0907e 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -720,6 +720,13 @@ union efi_tcg2_protocol {
} mixed_mode;
};

+struct riscv_efi_boot_protocol {
+ u64 revision;
+
+ efi_status_t (__efiapi * get_boot_hartid)(struct riscv_efi_boot_protocol *this,
+ size_t *boot_hartid);
+};
+
typedef union efi_load_file_protocol efi_load_file_protocol_t;
typedef union efi_load_file_protocol efi_load_file2_protocol_t;

diff --git a/drivers/firmware/efi/libstub/riscv-stub.c b/drivers/firmware/efi/libstub/riscv-stub.c
index 9c460843442f..012504f6f9a4 100644
--- a/drivers/firmware/efi/libstub/riscv-stub.c
+++ b/drivers/firmware/efi/libstub/riscv-stub.c
@@ -23,7 +23,7 @@

typedef void __noreturn (*jump_kernel_func)(unsigned int, unsigned long);

-static u32 hartid;
+static size_t hartid;

static int get_boot_hartid_from_fdt(void)
{
@@ -47,14 +47,33 @@ static int get_boot_hartid_from_fdt(void)
return 0;
}

+static efi_status_t get_boot_hartid_from_efi(void)
+{
+ efi_guid_t boot_protocol_guid = RISCV_EFI_BOOT_PROTOCOL_GUID;
+ efi_status_t status;
+ struct riscv_efi_boot_protocol *boot_protocol;
+
+ status = efi_bs_call(locate_protocol, &boot_protocol_guid, NULL,
+ (void **)&boot_protocol);
+ if (status == EFI_SUCCESS) {
+ status = efi_call_proto(boot_protocol,
+ get_boot_hartid, &hartid);
+ }
+ return status;
+}
+
efi_status_t check_platform_features(void)
{
int ret;
+ efi_status_t status;

- ret = get_boot_hartid_from_fdt();
- if (ret) {
- efi_err("/chosen/boot-hartid missing or invalid!\n");
- return EFI_UNSUPPORTED;
+ status = get_boot_hartid_from_efi();
+ if (status != EFI_SUCCESS) {
+ ret = get_boot_hartid_from_fdt();
+ if (ret) {
+ efi_err("Failed to get boot hartid!\n");
+ return EFI_UNSUPPORTED;
+ }
}
return EFI_SUCCESS;
}
diff --git a/include/linux/efi.h b/include/linux/efi.h
index ccd4d3f91c98..9822c730207c 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -380,6 +380,7 @@ void efi_native_runtime_setup(void);
#define EFI_CONSOLE_OUT_DEVICE_GUID EFI_GUID(0xd3b36f2c, 0xd551, 0x11d4, 0x9a, 0x46, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
#define APPLE_PROPERTIES_PROTOCOL_GUID EFI_GUID(0x91bd12fe, 0xf6c3, 0x44fb, 0xa5, 0xb7, 0x51, 0x22, 0xab, 0x30, 0x3a, 0xe0)
#define EFI_TCG2_PROTOCOL_GUID EFI_GUID(0x607f766c, 0x7455, 0x42be, 0x93, 0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f)
+#define RISCV_EFI_BOOT_PROTOCOL_GUID EFI_GUID(0xccd15fec, 0x6f73, 0x4eec, 0x83, 0x95, 0x3e, 0x69, 0xe4, 0xb9, 0x40, 0xbf)
#define EFI_LOAD_FILE_PROTOCOL_GUID EFI_GUID(0x56ec3091, 0x954c, 0x11d2, 0x8e, 0x3f, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b)
#define EFI_LOAD_FILE2_PROTOCOL_GUID EFI_GUID(0x4006c0c1, 0xfcb3, 0x403e, 0x99, 0x6d, 0x4a, 0x6c, 0x87, 0x24, 0xe0, 0x6d)
#define EFI_RT_PROPERTIES_TABLE_GUID EFI_GUID(0xeb66918a, 0x7eef, 0x402a, 0x84, 0x2e, 0x93, 0x1d, 0x21, 0xc3, 0x8a, 0xe9)
--
2.25.1
\
 
 \ /
  Last update: 2022-05-18 12:00    [W:1.454 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site