linux-kernel - Re: [RFC PATCH 6/6] ACPI/IORT: Drop code to set the PMCG software-defined model

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Date:   Tue, 15 Oct 2019 11:06:59 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     John Garry <john.garry@...wei.com>, <lorenzo.pieralisi@....com>,
        <sudeep.holla@....com>, <robin.murphy@....com>,
        <mark.rutland@....com>, <will@...nel.org>
CC:     <shameerali.kolothum.thodi@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <rjw@...ysocki.net>, <lenb@...nel.org>, <nleeder@...eaurora.org>,
        <linuxarm@...wei.com>
Subject: Re: [RFC PATCH 6/6] ACPI/IORT: Drop code to set the PMCG
 software-defined model

On 2019/9/30 22:33, John Garry wrote:
> Now that we can identify a PMCG implementation from the parent SMMUv3
> IIDR, drop all the code to match based on the ACPI OEM ID.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/acpi/arm64/iort.c | 35 +----------------------------------
>  include/linux/acpi_iort.h |  8 --------
>  2 files changed, 1 insertion(+), 42 deletions(-)
> 
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 0b687520c3e7..d04888cb8cff 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -1377,27 +1377,6 @@ static void __init arm_smmu_v3_pmcg_init_resources(struct resource *res,
>  				       ACPI_EDGE_SENSITIVE, &res[2]);
>  }
>  
> -static struct acpi_platform_list pmcg_plat_info[] __initdata = {
> -	/* HiSilicon Hip08 Platform */
> -	{"HISI  ", "HIP08   ", 0, ACPI_SIG_IORT, greater_than_or_equal,
> -	 "Erratum #162001800", IORT_SMMU_V3_PMCG_HISI_HIP08},
> -	{ }
> -};
> -
> -static int __init arm_smmu_v3_pmcg_add_platdata(struct platform_device *pdev)
> -{
> -	u32 model;
> -	int idx;
> -
> -	idx = acpi_match_platform_list(pmcg_plat_info);
> -	if (idx >= 0)
> -		model = pmcg_plat_info[idx].data;
> -	else
> -		model = IORT_SMMU_V3_PMCG_GENERIC;
> -
> -	return platform_device_add_data(pdev, &model, sizeof(model));
> -}
> -
>  struct iort_dev_config {
>  	const char *name;
>  	int (*dev_init)(struct acpi_iort_node *node);
> @@ -1408,7 +1387,6 @@ struct iort_dev_config {
>  				     struct acpi_iort_node *node);
>  	int (*dev_set_proximity)(struct device *dev,
>  				    struct acpi_iort_node *node);
> -	int (*dev_add_platdata)(struct platform_device *pdev);
>  };
>  
>  static const struct iort_dev_config iort_arm_smmu_v3_cfg __initconst = {
> @@ -1430,7 +1408,6 @@ static const struct iort_dev_config iort_arm_smmu_v3_pmcg_cfg __initconst = {
>  	.name = "arm-smmu-v3-pmcg",
>  	.dev_count_resources = arm_smmu_v3_pmcg_count_resources,
>  	.dev_init_resources = arm_smmu_v3_pmcg_init_resources,
> -	.dev_add_platdata = arm_smmu_v3_pmcg_add_platdata,
>  };
>  
>  static __init const struct iort_dev_config *iort_get_dev_cfg(
> @@ -1494,17 +1471,7 @@ static int __init iort_add_platform_device(struct acpi_iort_node *node,
>  	if (ret)
>  		goto dev_put;
>  
> -	/*
> -	 * Platform devices based on PMCG nodes uses platform_data to
> -	 * pass the hardware model info to the driver. For others, add
> -	 * a copy of IORT node pointer to platform_data to be used to
> -	 * retrieve IORT data information.
> -	 */
> -	if (ops->dev_add_platdata)
> -		ret = ops->dev_add_platdata(pdev);
> -	else
> -		ret = platform_device_add_data(pdev, &node, sizeof(node));
> -
> +	ret = platform_device_add_data(pdev, &node, sizeof(node));
>  	if (ret)
>  		goto dev_put;
>  
> diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> index 8e7e2ec37f1b..7a8961e6a8bb 100644
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -14,14 +14,6 @@
>  #define IORT_IRQ_MASK(irq)		(irq & 0xffffffffULL)
>  #define IORT_IRQ_TRIGGER_MASK(irq)	((irq >> 32) & 0xffffffffULL)
>  
> -/*
> - * PMCG model identifiers for use in smmu pmu driver. Please note
> - * that this is purely for the use of software and has nothing to
> - * do with hardware or with IORT specification.
> - */
> -#define IORT_SMMU_V3_PMCG_GENERIC        0x00000000 /* Generic SMMUv3 PMCG */
> -#define IORT_SMMU_V3_PMCG_HISI_HIP08     0x00000001 /* HiSilicon HIP08 PMCG */

Since only HiSilicon platform has such erratum, and I think it works with
both old version of firmware, I'm fine with removing this erratum framework.

Acked-by: Hanjun Guo <guohanjun@...wei.com>

Thanks
Hanjun