UbiquitousOS
/
anolis-cloud-kernel
mirror of https://gitee.com/anolis/cloud-kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit() 

ANBZ: #1293

commit 6b7fe77c33 upstream.

SMCCC callers are currently amassing a collection of enums for the SMCCC
conduit, and are having to dig into the PSCI driver's internals in order
to figure out what to do.

Let's clean this up, with common SMCCC_CONDUIT_* definitions, and an
arm_smccc_1_1_get_conduit() helper that abstracts the PSCI driver's
internal state.

We can kill off the PSCI_CONDUIT_* definitions once we've migrated users
over to the new interface.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Shawn Wang <shawnwang@linux.alibaba.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/966
This commit is contained in:
Mark Rutland 2019-08-09 14:22:40 +01:00 committed by 小龙
parent 88b22258f8
commit 605552e9a9
2 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/firmware/psci.c
View File

@ -64,6 +64,21 @@ struct psci_operations psci_ops = {
.smccc_version = SMCCC_VERSION_1_0,
};
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
{
if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
return SMCCC_CONDUIT_NONE;
switch (psci_ops.conduit) {
case PSCI_CONDUIT_SMC:
return SMCCC_CONDUIT_SMC;
case PSCI_CONDUIT_HVC:
return SMCCC_CONDUIT_HVC;
default:
return SMCCC_CONDUIT_NONE;
}
}
typedef unsigned long (psci_fn)(unsigned long, unsigned long,
unsigned long, unsigned long);
static psci_fn *invoke_psci_fn;

16
include/linux/arm-smccc.h
View File

@ -89,6 +89,22 @@
#include <linux/linkage.h>
#include <linux/types.h>
enum arm_smccc_conduit {
SMCCC_CONDUIT_NONE,
SMCCC_CONDUIT_SMC,
SMCCC_CONDUIT_HVC,
};
/**
* arm_smccc_1_1_get_conduit()
*
* Returns the conduit to be used for SMCCCv1.1 or later.
*
* When SMCCCv1.1 is not present, returns SMCCC_CONDUIT_NONE.
*/
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void);
/**
* struct arm_smccc_res - Result from SMC/HVC call
* @a0-a3 result values from registers 0 to 3