linux-kernel - Re: [PATCH 03/20] lightnvm: fix capabilities for 2.0 sysfs

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Message-ID: <23b494fb-264d-a8ef-6172-5330d5a63bea@lightnvm.io>
Date:   Thu, 22 Feb 2018 08:28:33 +0100
From:   Matias Bjørling <mb@...htnvm.io>
To:     Javier González <jg@...htnvm.io>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nvme@...ts.infradead.org,
        Javier González <javier@...xlabs.com>
Subject: Re: [PATCH 03/20] lightnvm: fix capabilities for 2.0 sysfs

On 02/21/2018 10:26 AM, Javier González wrote:
> Both 1.2 and 2.0 specs define a field for media and controller
> capabilities. Also, 1.2 defines a separate field dedicated to device
> capabilities.
> 
> In 2.0 sysfs, this values have been mixed. Revert them to the right
> value.
> 
> Signed-off-by: Javier González <javier@...xlabs.com>
> ---
>   drivers/nvme/host/lightnvm.c | 18 +++++++++---------
>   1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
> index 969bb874850c..598abba66f52 100644
> --- a/drivers/nvme/host/lightnvm.c
> +++ b/drivers/nvme/host/lightnvm.c
> @@ -914,8 +914,8 @@ static ssize_t nvm_dev_attr_show(struct device *dev,
>   
>   	if (strcmp(attr->name, "version") == 0) {
>   		return scnprintf(page, PAGE_SIZE, "%u\n", dev_geo->ver_id);
> -	} else if (strcmp(attr->name, "capabilities") == 0) {
> -		return scnprintf(page, PAGE_SIZE, "%u\n", dev_geo->c.cap);
> +	} else if (strcmp(attr->name, "media_capabilities") == 0) {
> +		return scnprintf(page, PAGE_SIZE, "%u\n", dev_geo->c.mccap);
>   	} else if (strcmp(attr->name, "read_typ") == 0) {
>   		return scnprintf(page, PAGE_SIZE, "%u\n", dev_geo->c.trdt);
>   	} else if (strcmp(attr->name, "read_max") == 0) {
> @@ -993,8 +993,8 @@ static ssize_t nvm_dev_attr_show_12(struct device *dev,
>   		return scnprintf(page, PAGE_SIZE, "%u\n", dev_geo->c.tbem);
>   	} else if (strcmp(attr->name, "multiplane_modes") == 0) {
>   		return scnprintf(page, PAGE_SIZE, "0x%08x\n", dev_geo->c.mpos);
> -	} else if (strcmp(attr->name, "media_capabilities") == 0) {
> -		return scnprintf(page, PAGE_SIZE, "0x%08x\n", dev_geo->c.mccap);
> +	} else if (strcmp(attr->name, "capabilities") == 0) {
> +		return scnprintf(page, PAGE_SIZE, "0x%08x\n", dev_geo->c.cap);
>   	} else if (strcmp(attr->name, "max_phys_secs") == 0) {
>   		return scnprintf(page, PAGE_SIZE, "%u\n", NVM_MAX_VLBA);
>   	} else {
> @@ -1055,7 +1055,7 @@ static ssize_t nvm_dev_attr_show_20(struct device *dev,
>   
>   /* general attributes */
>   static NVM_DEV_ATTR_RO(version);
> -static NVM_DEV_ATTR_RO(capabilities);
> +static NVM_DEV_ATTR_RO(media_capabilities);
>   
>   static NVM_DEV_ATTR_RO(read_typ);
>   static NVM_DEV_ATTR_RO(read_max);
> @@ -1080,12 +1080,12 @@ static NVM_DEV_ATTR_12_RO(prog_max);
>   static NVM_DEV_ATTR_12_RO(erase_typ);
>   static NVM_DEV_ATTR_12_RO(erase_max);
>   static NVM_DEV_ATTR_12_RO(multiplane_modes);
> -static NVM_DEV_ATTR_12_RO(media_capabilities);
> +static NVM_DEV_ATTR_12_RO(capabilities);
>   static NVM_DEV_ATTR_12_RO(max_phys_secs);
>   
>   static struct attribute *nvm_dev_attrs_12[] = {
>   	&dev_attr_version.attr,
> -	&dev_attr_capabilities.attr,
> +	&dev_attr_media_capabilities.attr,
>   
>   	&dev_attr_vendor_opcode.attr,
>   	&dev_attr_device_mode.attr,
> @@ -1108,7 +1108,7 @@ static struct attribute *nvm_dev_attrs_12[] = {
>   	&dev_attr_erase_typ.attr,
>   	&dev_attr_erase_max.attr,
>   	&dev_attr_multiplane_modes.attr,
> -	&dev_attr_media_capabilities.attr,
> +	&dev_attr_capabilities.attr,
>   	&dev_attr_max_phys_secs.attr,
>   
>   	NULL,
> @@ -1134,7 +1134,7 @@ static NVM_DEV_ATTR_20_RO(reset_max);
>   
>   static struct attribute *nvm_dev_attrs_20[] = {
>   	&dev_attr_version.attr,
> -	&dev_attr_capabilities.attr,
> +	&dev_attr_media_capabilities.attr,
>   
>   	&dev_attr_groups.attr,
>   	&dev_attr_punits.attr,
> 

With the mccap changes, it should make sense to keep the capabilities as is.