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Subject[PATCH AUTOSEL 4.19 12/42] iscsi_ibft: make ISCSI_IBFT dependson ACPI instead of ISCSI_IBFT_FIND
Date
From: Thomas Tai <thomas.tai@oracle.com>

[ Upstream commit 94bccc34071094c165c79b515d21b63c78f7e968 ]

iscsi_ibft can use ACPI to find the iBFT entry during bootup,
currently, ISCSI_IBFT depends on ISCSI_IBFT_FIND which is
a X86 legacy way to find the iBFT by searching through the
low memory. This patch changes the dependency so that other
arch like ARM64 can use ISCSI_IBFT as long as the arch supports
ACPI.

ibft_init() needs to use the global variable ibft_addr declared
in iscsi_ibft_find.c. A #ifndef CONFIG_ISCSI_IBFT_FIND is needed
to declare the variable if CONFIG_ISCSI_IBFT_FIND is not selected.
Moving ibft_addr into the iscsi_ibft.c does not work because if
ISCSI_IBFT is selected as a module, the arch/x86/kernel/setup.c won't
be able to find the variable at compile time.

Signed-off-by: Thomas Tai <thomas.tai@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/firmware/Kconfig | 5 +++--
drivers/firmware/iscsi_ibft.c | 4 ++++
2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 6e83880046d78..ed212c8b41083 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -198,7 +198,7 @@ config DMI_SCAN_MACHINE_NON_EFI_FALLBACK

config ISCSI_IBFT_FIND
bool "iSCSI Boot Firmware Table Attributes"
- depends on X86 && ACPI
+ depends on X86 && ISCSI_IBFT
default n
help
This option enables the kernel to find the region of memory
@@ -209,7 +209,8 @@ config ISCSI_IBFT_FIND
config ISCSI_IBFT
tristate "iSCSI Boot Firmware Table Attributes module"
select ISCSI_BOOT_SYSFS
- depends on ISCSI_IBFT_FIND && SCSI && SCSI_LOWLEVEL
+ select ISCSI_IBFT_FIND if X86
+ depends on ACPI && SCSI && SCSI_LOWLEVEL
default n
help
This option enables support for detection and exposing of iSCSI
diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c
index c51462f5aa1e4..966aef334c420 100644
--- a/drivers/firmware/iscsi_ibft.c
+++ b/drivers/firmware/iscsi_ibft.c
@@ -93,6 +93,10 @@ MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
MODULE_LICENSE("GPL");
MODULE_VERSION(IBFT_ISCSI_VERSION);

+#ifndef CONFIG_ISCSI_IBFT_FIND
+struct acpi_table_ibft *ibft_addr;
+#endif
+
struct ibft_hdr {
u8 id;
u8 version;
--
2.20.1
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