* [Accel-config] Re: [PATCH v1 2/4] accel-config: Add compatibility mode detection
@ 2021-03-11 18:24 Dave Jiang
0 siblings, 0 replies; 2+ messages in thread
From: Dave Jiang @ 2021-03-11 18:24 UTC (permalink / raw)
To: accel-config
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On 3/11/2021 11:03 AM, ramesh.thomas(a)intel.com wrote:
> From: Ramesh Thomas <ramesh.thomas(a)intel.com>
>
> Add a flag in accfg context to store commpatibility mode. Absence of
> /sys/bus/dsa/drivers/idxd indicates compatibility mode.
>
> Signed-off-by: Ramesh Thomas <ramesh.thomas(a)intel.com>
> ---
> accfg/lib/libaccfg.c | 5 +++++
> accfg/lib/private.h | 1 +
> 2 files changed, 6 insertions(+)
>
> diff --git a/accfg/lib/libaccfg.c b/accfg/lib/libaccfg.c
> index 450be4f..25d783c 100644
> --- a/accfg/lib/libaccfg.c
> +++ b/accfg/lib/libaccfg.c
> @@ -28,6 +28,8 @@
> #include "private.h"
>
> #define MDEV_POSTFIX "mdev_supported_types"
> +#define IDXD_DRIVER_PATH "/sys/bus/dsa/drivers/"
> +#define IDXD_DRIVER_PORTAL "idxd"
Portal is actually a device term. We have portal drivers for the WQ but
not the device. Maybe IDXD_DRIVER_BIND_PATH?
>
> const char *accfg_wq_mode_str[] = {
> [ACCFG_WQ_SHARED] = "shared",
> @@ -310,6 +312,9 @@ ACCFG_EXPORT int accfg_new(struct accfg_ctx **ctx)
> c->refcount = 1;
> log_init(&c->ctx, "libaccfg", "ACCFG_LOG");
> c->timeout = 5000;
> + if (access(IDXD_DRIVER_PATH IDXD_DRIVER_PORTAL, R_OK))
I think you want to detect /sys/bus/dsa/drivers/dsa to be in compat
mode? If COMPAT is turned off, /sys/bus/dsa/drivers/dsa would not exist.
> + c->compat = true;
> +
> list_head_init(&c->devices);
>
> info(c, "ctx %p created\n", c);
> diff --git a/accfg/lib/private.h b/accfg/lib/private.h
> index 0fdc5d5..f407643 100644
> --- a/accfg/lib/private.h
> +++ b/accfg/lib/private.h
> @@ -146,6 +146,7 @@ struct accfg_ctx {
> struct list_head devices;
> uint64_t timeout;
> void *private_data;
> + bool compat;
> };
>
> static inline int check_udev(struct udev *udev)
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Accel-config] Re: [PATCH v1 2/4] accel-config: Add compatibility mode detection
@ 2021-03-11 19:25 Thomas, Ramesh
0 siblings, 0 replies; 2+ messages in thread
From: Thomas, Ramesh @ 2021-03-11 19:25 UTC (permalink / raw)
To: accel-config
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On Thu, Mar 11, 2021 at 11:24:06AM -0700, Dave Jiang wrote:
>
> On 3/11/2021 11:03 AM, ramesh.thomas(a)intel.com wrote:
> > From: Ramesh Thomas <ramesh.thomas(a)intel.com>
> >
> > Add a flag in accfg context to store commpatibility mode. Absence of
> > /sys/bus/dsa/drivers/idxd indicates compatibility mode.
> >
> > Signed-off-by: Ramesh Thomas <ramesh.thomas(a)intel.com>
> > ---
> > accfg/lib/libaccfg.c | 5 +++++
> > accfg/lib/private.h | 1 +
> > 2 files changed, 6 insertions(+)
> >
> > diff --git a/accfg/lib/libaccfg.c b/accfg/lib/libaccfg.c
> > index 450be4f..25d783c 100644
> > --- a/accfg/lib/libaccfg.c
> > +++ b/accfg/lib/libaccfg.c
> > @@ -28,6 +28,8 @@
> > #include "private.h"
> >
> > #define MDEV_POSTFIX "mdev_supported_types"
> > +#define IDXD_DRIVER_PATH "/sys/bus/dsa/drivers/"
> > +#define IDXD_DRIVER_PORTAL "idxd"
>
> Portal is actually a device term. We have portal drivers for the WQ but
> not the device. Maybe IDXD_DRIVER_BIND_PATH?
Ok, will combine the 2 into one.
#define IDXD_DRIVER_BIND_PATH "/sys/bus/dsa/drivers/idxd"
(Looks like there was a merge issue. This will be in patch #2 in next
version.)
>
> >
> > const char *accfg_wq_mode_str[] = {
> > [ACCFG_WQ_SHARED] = "shared",
> > @@ -310,6 +312,9 @@ ACCFG_EXPORT int accfg_new(struct accfg_ctx **ctx)
> > c->refcount = 1;
> > log_init(&c->ctx, "libaccfg", "ACCFG_LOG");
> > c->timeout = 5000;
> > + if (access(IDXD_DRIVER_PATH IDXD_DRIVER_PORTAL, R_OK))
>
> I think you want to detect /sys/bus/dsa/drivers/dsa to be in compat
> mode? If COMPAT is turned off, /sys/bus/dsa/drivers/dsa would not exist.
"compat mode" in accel-config refers to it being compatible with ABI in
older kernels. It does not mean the kernel mode enabled by
CONFIG_INTEL_IDXD_COMPAT.
There can be a case in older kernels with only iax devices being
present, resulting in /sys/bus/iax/drivers/iax. Whereas
/sys/bus/dsa/drivers/idxd will never be present in older kernels. In
kernels with the new ABI, if ".../idxd" is found then accel-config will
use new ABI as it should, irrespective of the kernel being built with
CONFIG_INTEL_IDXD_COMPAT enabled or not.
>
>
> > + c->compat = true;
> > +
> > list_head_init(&c->devices);
> >
> > info(c, "ctx %p created\n", c);
> > diff --git a/accfg/lib/private.h b/accfg/lib/private.h
> > index 0fdc5d5..f407643 100644
> > --- a/accfg/lib/private.h
> > +++ b/accfg/lib/private.h
> > @@ -146,6 +146,7 @@ struct accfg_ctx {
> > struct list_head devices;
> > uint64_t timeout;
> > void *private_data;
> > + bool compat;
> > };
> >
> > static inline int check_udev(struct udev *udev)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-03-11 18:24 [Accel-config] Re: [PATCH v1 2/4] accel-config: Add compatibility mode detection Dave Jiang
2021-03-11 19:25 Thomas, Ramesh
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