On Mon, Nov 02, 2015 at 11:55:39AM +0000, Will Deacon wrote:

On Thu, Oct 29, 2015 at 09:21:24AM +0100, Jens Wiklander wrote:

quoted

Switch to use a generic interface for issuing SMC/HVC based on ARM SMC
Calling Convention. Removes now the now unused psci-call.S.

Signed-off-by: Jens Wiklander <redacted>
---
 arch/arm/kernel/Makefile      |  1 -
 arch/arm/kernel/psci-call.S   | 31 -------------------------------
 arch/arm64/kernel/Makefile    |  2 +-
 arch/arm64/kernel/psci-call.S | 28 ----------------------------
 drivers/firmware/psci.c       | 21 +++++++++++++++++++--
 5 files changed, 20 insertions(+), 63 deletions(-)
 delete mode 100644 arch/arm/kernel/psci-call.S
 delete mode 100644 arch/arm64/kernel/psci-call.S

[...]

quoted

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 42700f0..53c9606 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c

@@ -19,6 +19,7 @@
 #include <linux/pm.h>
 #include <linux/printk.h>
 #include <linux/psci.h>
+#include <linux/arm-smccc.h>
 #include <linux/reboot.h>
 
 #include <uapi/linux/psci.h>

@@ -56,8 +57,6 @@ struct psci_operations psci_ops;
 
 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
 				unsigned long, unsigned long);
-asmlinkage psci_fn __invoke_psci_fn_hvc;
-asmlinkage psci_fn __invoke_psci_fn_smc;
 static psci_fn *invoke_psci_fn;
 
 enum psci_function {

@@ -70,6 +69,24 @@ enum psci_function {
 
 static u32 psci_function_id[PSCI_FN_MAX];
 
+static unsigned long __invoke_psci_fn_hvc(unsigned long a0, unsigned long a1,
+			unsigned long a2, unsigned long a3)

Minor comment, but could we keep these argument names the same as before
please?

You mean function_id, arg0, arg1... instead? I guess I should update
arm-smccc.h also then.

quoted

+{
+	struct smccc_res res;
+
+	smccc_hvc(a0, a1, a2, a3, 0, 0, 0, 0, &res);

It's slightly tempting to use varargs instead of the '0' argument padding,
but that will probably make the asm code unmanageable.

Agree.

Thanks,
Jens
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