On 11/15/2017 12:09 PM, Michael Bringmann wrote: > Firmware Features: Define new bit flag representing the presence of > new device tree property "ibm,drc-info". The flag is used to tell > the front end processor whether the Linux kernel supports the new > property, and by the front end processor to tell the Linux kernel > that the new property is present in the device tree.
This patch seems to be adding a bit for the drc-info feature so that we can use the firmware_has_feature() interface to determine if the device tree has the new ibm,drc-info properties. I'm not sure what front-end processor you're referring to? Is this in reference to the architecture vector that is exchanged with firmware? -Nathan > > Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com> > --- > arch/powerpc/include/asm/firmware.h | 3 ++- > arch/powerpc/include/asm/prom.h | 1 + > arch/powerpc/platforms/pseries/firmware.c | 1 + > 3 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/arch/powerpc/include/asm/firmware.h > b/arch/powerpc/include/asm/firmware.h > index 8645897..329d537 100644 > --- a/arch/powerpc/include/asm/firmware.h > +++ b/arch/powerpc/include/asm/firmware.h > @@ -51,6 +51,7 @@ > #define FW_FEATURE_BEST_ENERGY ASM_CONST(0x0000000080000000) > #define FW_FEATURE_TYPE1_AFFINITY ASM_CONST(0x0000000100000000) > #define FW_FEATURE_PRRN ASM_CONST(0x0000000200000000) > +#define FW_FEATURE_DRC_INFO ASM_CONST(0x0000000400000000) > > #ifndef __ASSEMBLY__ > > @@ -67,7 +68,7 @@ enum { > FW_FEATURE_CMO | FW_FEATURE_VPHN | FW_FEATURE_XCMO | > FW_FEATURE_SET_MODE | FW_FEATURE_BEST_ENERGY | > FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN | > - FW_FEATURE_HPT_RESIZE, > + FW_FEATURE_HPT_RESIZE | FW_FEATURE_DRC_INFO, > FW_FEATURE_PSERIES_ALWAYS = 0, > FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL, > FW_FEATURE_POWERNV_ALWAYS = 0, > diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h > index 825bd59..3243455 100644 > --- a/arch/powerpc/include/asm/prom.h > +++ b/arch/powerpc/include/asm/prom.h > @@ -175,6 +175,7 @@ struct of_drconf_cell { > #define OV5_HASH_GTSE 0x1940 /* Guest Translation Shoot Down > Avail */ > /* Radix Table Extensions */ > #define OV5_RADIX_GTSE 0x1A40 /* Guest Translation Shoot Down > Avail */ > +#define OV5_DRC_INFO 0x1640 /* Redef Prop Structures: drc-info */ > > /* Option Vector 6: IBM PAPR hints */ > #define OV6_LINUX 0x02 /* Linux is our OS */ > diff --git a/arch/powerpc/platforms/pseries/firmware.c > b/arch/powerpc/platforms/pseries/firmware.c > index 63cc82a..757d757 100644 > --- a/arch/powerpc/platforms/pseries/firmware.c > +++ b/arch/powerpc/platforms/pseries/firmware.c > @@ -114,6 +114,7 @@ struct vec5_fw_feature { > vec5_fw_features_table[] = { > {FW_FEATURE_TYPE1_AFFINITY, OV5_TYPE1_AFFINITY}, > {FW_FEATURE_PRRN, OV5_PRRN}, > + {FW_FEATURE_DRC_INFO, OV5_DRC_INFO}, > }; > > static void __init fw_vec5_feature_init(const char *vec5, unsigned long len) >