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[v4,11/25] powerpc: Enable the OpenCAPI Persistent Memory driver for powernv_defconfig

Message ID 20200327071202.2159885-12-alastair@d-silva.org
State New, archived
Headers show
Series Add support for OpenCAPI Persistent Memory devices | expand

Commit Message

Alastair D'Silva March 27, 2020, 7:11 a.m. UTC
This patch enables the OpenCAPI Persistent Memory driver, as well
as DAX support, for the 'powernv' defconfig.

DAX is not a strict requirement for the functioning of the driver, but it
is likely that a user will want to create a DAX device on top of their
persistent memory device.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
---
 arch/powerpc/configs/powernv_defconfig | 5 +++++
 1 file changed, 5 insertions(+)

Comments

Dan Williams April 1, 2020, 8:26 p.m. UTC | #1
On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@d-silva.org> wrote:
>
> This patch enables the OpenCAPI Persistent Memory driver, as well
> as DAX support, for the 'powernv' defconfig.
>
> DAX is not a strict requirement for the functioning of the driver, but it
> is likely that a user will want to create a DAX device on top of their
> persistent memory device.
>
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
> ---
>  arch/powerpc/configs/powernv_defconfig | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/powerpc/configs/powernv_defconfig b/arch/powerpc/configs/powernv_defconfig
> index 71749377d164..921d77bbd3d2 100644
> --- a/arch/powerpc/configs/powernv_defconfig
> +++ b/arch/powerpc/configs/powernv_defconfig
> @@ -348,3 +348,8 @@ CONFIG_KVM_BOOK3S_64=m
>  CONFIG_KVM_BOOK3S_64_HV=m
>  CONFIG_VHOST_NET=m
>  CONFIG_PRINTK_TIME=y
> +CONFIG_ZONE_DEVICE=y
> +CONFIG_OCXL_PMEM=m
> +CONFIG_DEV_DAX=m
> +CONFIG_DEV_DAX_PMEM=m
> +CONFIG_FS_DAX=y

These options have dependencies. I think it would better to implement
a top-level configuration question called something like
PERSISTENT_MEMORY_ALL that goes and selects all the bus providers and
infrastructure and lets other defaults follow along. For example,
CONFIG_DEV_DAX could grow a "default LIBNVDIMM" and then
CONFIG_DEV_DAX_PMEM would default on as well. If
CONFIG_PERSISTENT_MEMORY_ALL selected all the bus providers and
ZONE_DEVICE then the Kconfig system could prompt you to where the
dependencies are not satisfied.
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Patch

diff --git a/arch/powerpc/configs/powernv_defconfig b/arch/powerpc/configs/powernv_defconfig
index 71749377d164..921d77bbd3d2 100644
--- a/arch/powerpc/configs/powernv_defconfig
+++ b/arch/powerpc/configs/powernv_defconfig
@@ -348,3 +348,8 @@  CONFIG_KVM_BOOK3S_64=m
 CONFIG_KVM_BOOK3S_64_HV=m
 CONFIG_VHOST_NET=m
 CONFIG_PRINTK_TIME=y
+CONFIG_ZONE_DEVICE=y
+CONFIG_OCXL_PMEM=m
+CONFIG_DEV_DAX=m
+CONFIG_DEV_DAX_PMEM=m
+CONFIG_FS_DAX=y