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SubjectRe: [PATCH 03/20] lightnvm: fix capabilities for 2.0 sysfs
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On 02/22/2018 11:25 AM, Javier Gonzalez wrote:
>
>
>> On 22 Feb 2018, at 10.39, Matias Bjørling <mb@lightnvm.io> wrote:
>>
>> On 02/22/2018 08:47 AM, Javier Gonzalez wrote:
>>>> On 22 Feb 2018, at 08.28, Matias Bjørling <mb@lightnvm.io> wrote:
>>>>
>>>>> 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@cnexlabs.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.
>>> The change adds mccap, but sysfs points to cap, which is wrong. This
>>> patch is needed. Otherwise, we change the name of mccap to cap, which
>>> is _very_ confusing to people familiar to both specs. We can change
>>> the name of mccap to cap in a future spec revision.
>>> Javier
>>
>> Think of the sysfs capabilities as an abstract value that defines generic capabilities. It is not directly tied to either 1.2 or 2.0.
>
> I’m thinking about the user looking at sysfs and at the spec at the same time - I myself get confused when names don’t match.
>
> Anyway, I’ll keep it the way it was and add a comment for clarification. Would that work for you?
>

That works. One may also wait until it is going to be used, e.g., when
vector copy is implemented. Then it's natural to revisit.

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