kernel/arch/powerpc/platforms/pseries/vas-sysfs.c, branch linux-6.2.y

powerpc/pseries/vas: Call misc_deregister if sysfs init fails

2022-05-22T05:58:31Z

Undo effects of misc_register if sysfs init fails after misc_register. Signed-off-by: Zheng Bin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220511033507.2745992-1-zhengbin13@huawei.com

powerpc/pseries/vas: sysfs comments with the correct entries

2022-05-22T05:58:27Z

VAS entry is created as a misc device and the sysfs comments should list the proper entries Reported-by: Matheus Castanho Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/6dee950c7b72a4965c102208041f14a063cf5a8c.camel@linux.ibm.com

Merge branch 'fixes' into next

2022-05-18T14:11:51Z

Merge our fixes branch from this cycle. In particular this brings in a papr_scm.c change which a subsequent patch has a dependency on.

powerpc: fix typos in comments

2022-05-05T12:12:44Z

Various spelling mistakes in comments. Detected with the help of Coccinelle. Signed-off-by: Julia Lawall Reviewed-by: Joel Stanley Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220430185654.5855-1-Julia.Lawall@inria.fr

powerpc/pseries/vas: Use QoS credits from the userspace

2022-05-04T12:00:47Z

The user can change the QoS credits dynamically with the management console interface which notifies OS with sysfs. After returning from the OS interface successfully, the management console updates the hypervisor. Since the VAS capabilities in the hypervisor is not updated when the OS gets the update, the kernel is using the old total credits value from the hypervisor. Fix this issue by using the new QoS credits from the userspace instead of depending on VAS capabilities from the hypervisor. Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/76d156f8af1e03cc09369d68e0bfad0c40031bcc.camel@linux.ibm.com

powerpc/pseries/vas: use default_groups in kobj_type

2022-04-05T13:38:30Z

There are currently 2 ways to create a set of sysfs files for a kobj_type, through the default_attrs field, and the default_groups field. Move the pseries vas sysfs code to use default_groups field which has been the preferred way since aa30f47cf666 ("kobject: Add support for default attribute groups to kobj_type") so that we can soon get rid of the obsolete default_attrs field. Cc: Michael Ellerman Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Haren Myneni Cc: Nicholas Piggin Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Link: https://lore.kernel.org/r/20220329142552.558339-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

powerpc/pseries/vas: Add 'update_total_credits' entry for QoS capabilities

2022-03-07T13:04:56Z

pseries supports two types of credits - Default (uses normal priority FIFO) and Qality of service (QoS uses high priority FIFO). The user decides the number of QoS credits and sets this value with HMC interface. The total credits for QoS capabilities can be changed dynamically with HMC interface which invokes drmgr to communicate to the kernel. This patch creats 'update_total_credits' entry for QoS capabilities so that drmgr command can write the new target QoS credits in sysfs. Instead of using this value, the kernel gets the new QoS capabilities from the hypervisor whenever update_total_credits is updated to make sure sync with the QoS target credits in the hypervisor. Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/b01ef31a0f964686d00243e7de7f09c73c07e69e.camel@linux.ibm.com

powerpc/pseries/vas: sysfs interface to export capabilities

2022-03-07T13:04:56Z

The hypervisor provides the available VAS GZIP capabilities such as default or QoS window type and the target available credits in each type. This patch creates sysfs entries and exports the target, used and the available credits for each feature. This interface can be used by the user space to determine the credits usage or to set the target credits in the case of QoS type (for DLPAR). /sys/devices/vas/vas0/gzip/default_capabilities (default GZIP capabilities) nr_total_credits /* Total credits available. Can be /* changed with DLPAR operation */ nr_used_credits /* Used credits */ /sys/devices/vas/vas0/gzip/qos_capabilities (QoS GZIP capabilities) nr_total_credits nr_used_credits Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/702d8b626ebfac2b52f4995eebeafe1c9a6fcb75.camel@linux.ibm.com