[PATCH v4 05/16] riscv: Extend cpufeature.c to detect vendor extensions

[Conor Dooley]

On Fri, Apr 26, 2024 at 02:29:19PM -0700, Charlie Jenkins wrote:
> @@ -353,6 +336,10 @@ static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct risc
>  		bool ext_long = false, ext_err = false;
>  
>  		switch (*ext) {
> +		case 'x':
> +		case 'X':
> +			pr_warn_once("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.");
> +			continue;

Yeah, so this is not right - you need to find the end of the extension
before containing - for example if I had a system with
rv64imafdcxconorkwe, you get something like:
[    0.000000] CPU with hartid=0 is not available
[    0.000000] Falling back to deprecated "riscv,isa"
[    0.000000] Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.
[    0.000000] riscv: base ISA extensions acdefikmnorw
[    0.000000] riscv: ELF capabilities acdfim

kwe are all pretty safe letters, but suppose one was a v..
I think you can just yoink the code from the s/z case:

diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index 20bc9ba6b7a2..4daedba7961f 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -338,8 +338,19 @@ static void __init riscv_parse_isa_string(unsigned long *this_hwcap, struct risc
 		switch (*ext) {
 		case 'x':
 		case 'X':
-			pr_warn_once("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.");
-			continue;
+			if (acpi_disabled)
+				pr_warn_once("Vendor extensions are ignored in riscv,isa. Use riscv,isa-extensions instead.");
+			/*
+			 * To skip an extension, we find its end.
+			 * As multi-letter extensions must be split from other multi-letter
+			 * extensions with an "_", the end of a multi-letter extension will
+			 * either be the null character or the "_" at the start of the next
+			 * multi-letter extension.
+			 */
+			for (; *isa && *isa != '_'; ++isa)
+				;
+			ext_err = true;
+			break;
 		case 's':
 			/*
 			 * Workaround for invalid single-letter 's' & 'u' (QEMU).

You'll note that I made the dt property error dt only, this function
gets called for ACPI too. I think the skip is pretty safe there though
at the moment, we've not established any meanings yet for vendor stuff
on ACPI.
I think breaking is probably better than using continue - we get the _
skip from outside the switch statement out of that. And ye, I am lazy
so I kept it as a for loop.

Cheers,
Conor.
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