[PATCH v2 0/1] Enable SPCR table for console output on RISC-V

[PATCH v2 0/1] Enable SPCR table for console output on RISC-V

[Sia Jee Heng]

The ACPI SPCR code has been used to enable console output for ARM64 and
X86. The same code can be reused for RISC-V. Furthermore, SPCR table is
mandated for headless system as outlined in the RISC-V BRS
Specification, chapter 6.

Changes in v2:
- Added code to handle early_init_dt_scan_chosen_stdout().

Sia Jee Heng (1):
  RISC-V: ACPI: Enable SPCR table for console output on RISC-V

 arch/riscv/Kconfig       |  1 +
 arch/riscv/kernel/acpi.c | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)


base-commit: 0106679839f7c69632b3b9833c3268c316c0a9fc
-- 
2.34.1


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[PATCH v2 1/1] RISC-V: ACPI: Enable SPCR table for console output on RISC-V

[Sia Jee Heng]

The ACPI SPCR code has been used to enable console output for ARM64 and
X86. The same code can be reused for RISC-V. Furthermore, SPCR table is
mandated for headless system as outlined in the RISC-V BRS
Specification, chapter 6.

Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
---
 arch/riscv/Kconfig       |  1 +
 arch/riscv/kernel/acpi.c | 12 +++++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index be09c8836d56..ff2e270bbe01 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -14,6 +14,7 @@ config RISCV
 	def_bool y
 	select ACPI_GENERIC_GSI if ACPI
 	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
+	select ACPI_SPCR_TABLE if ACPI
 	select ARCH_DMA_DEFAULT_COHERENT
 	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c
index e619edc8b0cc..43a12c00ae8b 100644
--- a/arch/riscv/kernel/acpi.c
+++ b/arch/riscv/kernel/acpi.c
@@ -17,7 +17,9 @@
 #include <linux/efi.h>
 #include <linux/io.h>
 #include <linux/memblock.h>
+#include <linux/of_fdt.h>
 #include <linux/pci.h>
+#include <linux/serial_core.h>
 
 int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
 int acpi_disabled = 1;
@@ -131,7 +133,7 @@ void __init acpi_boot_table_init(void)
 	if (param_acpi_off ||
 	    (!param_acpi_on && !param_acpi_force &&
 	     efi.acpi20 == EFI_INVALID_TABLE_ADDR))
-		return;
+		goto done;
 
 	/*
 	 * ACPI is disabled at this point. Enable it in order to parse
@@ -151,6 +153,14 @@ void __init acpi_boot_table_init(void)
 		if (!param_acpi_force)
 			disable_acpi();
 	}
+
+done:
+	if (acpi_disabled) {
+		if (earlycon_acpi_spcr_enable)
+			early_init_dt_scan_chosen_stdout();
+	} else {
+		acpi_parse_spcr(earlycon_acpi_spcr_enable, true);
+	}
 }
 
 static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end)
-- 
2.34.1


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Re: [PATCH v2 1/1] RISC-V: ACPI: Enable SPCR table for console output on RISC-V

[Sunil V L]

On Thu, May 02, 2024 at 12:37:51AM -0700, Sia Jee Heng wrote:
> The ACPI SPCR code has been used to enable console output for ARM64 and
> X86. The same code can be reused for RISC-V. Furthermore, SPCR table is
> mandated for headless system as outlined in the RISC-V BRS
> Specification, chapter 6.
> 
> Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
> ---
>  arch/riscv/Kconfig       |  1 +
>  arch/riscv/kernel/acpi.c | 12 +++++++++++-
>  2 files changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index be09c8836d56..ff2e270bbe01 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -14,6 +14,7 @@ config RISCV
>  	def_bool y
>  	select ACPI_GENERIC_GSI if ACPI
>  	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
> +	select ACPI_SPCR_TABLE if ACPI
>  	select ARCH_DMA_DEFAULT_COHERENT
>  	select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
>  	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
> diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c
> index e619edc8b0cc..43a12c00ae8b 100644
> --- a/arch/riscv/kernel/acpi.c
> +++ b/arch/riscv/kernel/acpi.c
> @@ -17,7 +17,9 @@
>  #include <linux/efi.h>
>  #include <linux/io.h>
>  #include <linux/memblock.h>
> +#include <linux/of_fdt.h>
>  #include <linux/pci.h>
> +#include <linux/serial_core.h>
>  
>  int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
>  int acpi_disabled = 1;
> @@ -131,7 +133,7 @@ void __init acpi_boot_table_init(void)
>  	if (param_acpi_off ||
>  	    (!param_acpi_on && !param_acpi_force &&
>  	     efi.acpi20 == EFI_INVALID_TABLE_ADDR))
> -		return;
> +		goto done;
>  
>  	/*
>  	 * ACPI is disabled at this point. Enable it in order to parse
> @@ -151,6 +153,14 @@ void __init acpi_boot_table_init(void)
>  		if (!param_acpi_force)
>  			disable_acpi();
>  	}
> +
> +done:
> +	if (acpi_disabled) {
> +		if (earlycon_acpi_spcr_enable)
> +			early_init_dt_scan_chosen_stdout();
> +	} else {
> +		acpi_parse_spcr(earlycon_acpi_spcr_enable, true);
> +	}
LGTM.

Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>

Thanks,
Sunil
>  }
>  
>  static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end)
> -- 
> 2.34.1
> 

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Re: [PATCH v2 0/1] Enable SPCR table for console output on RISC-V

[patchwork-bot+linux-riscv]

Hello:

This patch was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer@rivosinc.com>:

On Thu,  2 May 2024 00:37:50 -0700 you wrote:
> The ACPI SPCR code has been used to enable console output for ARM64 and
> X86. The same code can be reused for RISC-V. Furthermore, SPCR table is
> mandated for headless system as outlined in the RISC-V BRS
> Specification, chapter 6.
> 
> Changes in v2:
> - Added code to handle early_init_dt_scan_chosen_stdout().
> 
> [...]

Here is the summary with links:
  - [v2,1/1] RISC-V: ACPI: Enable SPCR table for console output on RISC-V
    https://git.kernel.org/riscv/c/38738947db38

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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