On 1/12/23 18:54, Mark Rutland wrote:

Hi Anshuman,

On Thu, Jan 05, 2023 at 08:40:35AM +0530, Anshuman Khandual wrote:

quoted

This adds BRBE related register definitions and various other related field
macros there in. These will be used subsequently in a BRBE driver which is
being added later on.

I haven't verified the specific values, but this looks good to me aside from
one minor nit below.

[...]

quoted

+# This is just a dummy register declaration to get all common field masks and
+# shifts for accessing given BRBINF contents.
+Sysreg	BRBINF_EL1	2	1	8	0	0

We don't need a dummy declaration, as we have 'SysregFields' that can be used
for this, e.g.

  SysregFields BRBINFx_EL1
  ...
  EndSysregFields

... which will avoid accidental usage of the register encoding. Note that I've
also added an 'x' there in place of the index, which we do for other registers,
e.g. TTBRx_EL1.

Could you please update to that?

There is a problem in defining SysregFields (which I did explore earlier as well).
SysregFields unfortunately does not support enums fields. Following build failure
comes up, while trying to convert BRBINFx_EL1 into a SysregFields definition.

Error at 932: unexpected Enum (inside SysregFields)

===============================================================================

diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index a7f9054bd84c..519c4f080898 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg

@@ -921,10 +921,7 @@ Enum       3:0     BT
 EndEnum
 EndSysreg
 
-
-# This is just a dummy register declaration to get all common field masks and
-# shifts for accessing given BRBINF contents.
-Sysreg BRBINF_EL1      2       1       8       0       0
+SysregFields BRBINFx_EL1
 Res0   63:47
 Field  46      CCU
 Field  45:32   CC

@@ -967,7 +964,7 @@ Enum        1:0     VALID
        0b10    SOURCE
        0b11    FULL
 EndEnum
-EndSysreg
+EndSysregFields
 
 Sysreg BRBCR_EL1       2       1       9       0       0
 Res0   63:24

===============================================================================

There are three enum fields in BRBINFx_EL1 as listed here.

Enum    13:8            TYPE
Enum    7:6		EL
Enum    1:0     	VALID

However, BRBINF_EL1 can be changed as BRBINFx_EL1, indicating its more generic
nature with a potential to be used for any index value register thereafter.

With that:

Acked-by: Mark Rutland <mark.rutland@arm.com>

Mark.

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