Am Montag, 12. Dezember 2022, 12:55:00 CET schrieb Prabhakar: > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> > > Introduce ALTERNATIVE_3() macro. > > A vendor wants to replace an old_content, but another vendor has used > ALTERNATIVE_2() to patch its customized content at the same location. > In this case, this vendor can use macro ALTERNATIVE_3() and then replace > ALTERNATIVE_2() with ALTERNATIVE_3() to append its customized content. > > While at it update comment above ALTERNATIVE_2() macro and make it generic > so that the comment holds good for any new addition of ALTERNATIVE_X() > macros. > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> Reviewed-by: Heiko Stuebner <heiko.stuebner@xxxxxxxx> > --- > v4->v5 > * Rebased the patch on top of Andrew's series (now in Palmers for next-branch) > * Updated comment for ALTERNATIVE_x() as suggested by Heiko > > RFC v3 -> v4 > * New patch > --- > arch/riscv/include/asm/alternative-macros.h | 46 ++++++++++++++++++--- > 1 file changed, 41 insertions(+), 5 deletions(-) > > diff --git a/arch/riscv/include/asm/alternative-macros.h b/arch/riscv/include/asm/alternative-macros.h > index 7226e2462584..a5b4691520da 100644 > --- a/arch/riscv/include/asm/alternative-macros.h > +++ b/arch/riscv/include/asm/alternative-macros.h > @@ -50,8 +50,17 @@ > ALT_NEW_CONTENT \vendor_id_2, \errata_id_2, \enable_2, \new_c_2 > .endm > > +.macro ALTERNATIVE_CFG_3 old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \ > + new_c_2, vendor_id_2, errata_id_2, enable_2, \ > + new_c_3, vendor_id_3, errata_id_3, enable_3 > + ALTERNATIVE_CFG_2 \old_c, \new_c_1, \vendor_id_1, \errata_id_1, \enable_1, \ > + \new_c_2, \vendor_id_2, \errata_id_2, \enable_2 > + ALT_NEW_CONTENT \vendor_id_3, \errata_id_3, \enable_3, \new_c_3 > +.endm > + > #define __ALTERNATIVE_CFG(...) ALTERNATIVE_CFG __VA_ARGS__ > #define __ALTERNATIVE_CFG_2(...) ALTERNATIVE_CFG_2 __VA_ARGS__ > +#define __ALTERNATIVE_CFG_3(...) ALTERNATIVE_CFG_3 __VA_ARGS__ > > #else /* !__ASSEMBLY__ */ > > @@ -98,6 +107,13 @@ > __ALTERNATIVE_CFG(old_c, new_c_1, vendor_id_1, errata_id_1, enable_1) \ > ALT_NEW_CONTENT(vendor_id_2, errata_id_2, enable_2, new_c_2) > > +#define __ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \ > + new_c_2, vendor_id_2, errata_id_2, enable_2, \ > + new_c_3, vendor_id_3, errata_id_3, enable_3) \ > + __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, enable_1, \ > + new_c_2, vendor_id_2, errata_id_2, enable_2) \ > + ALT_NEW_CONTENT(vendor_id_3, errata_id_3, enable_3, new_c_3) > + > #endif /* __ASSEMBLY__ */ > > #define _ALTERNATIVE_CFG(old_c, new_c, vendor_id, errata_id, CONFIG_k) \ > @@ -108,6 +124,13 @@ > __ALTERNATIVE_CFG_2(old_c, new_c_1, vendor_id_1, errata_id_1, IS_ENABLED(CONFIG_k_1), \ > new_c_2, vendor_id_2, errata_id_2, IS_ENABLED(CONFIG_k_2)) > > +#define _ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ > + new_c_2, vendor_id_2, errata_id_2, CONFIG_k_2, \ > + new_c_3, vendor_id_3, errata_id_3, CONFIG_k_3) \ > + __ALTERNATIVE_CFG_3(old_c, new_c_1, vendor_id_1, errata_id_1, IS_ENABLED(CONFIG_k_1), \ > + new_c_2, vendor_id_2, errata_id_2, IS_ENABLED(CONFIG_k_2), \ > + new_c_3, vendor_id_3, errata_id_3, IS_ENABLED(CONFIG_k_3)) > + > #else /* CONFIG_RISCV_ALTERNATIVE */ > #ifdef __ASSEMBLY__ > > @@ -152,15 +175,28 @@ > _ALTERNATIVE_CFG(old_content, new_content, vendor_id, errata_id, CONFIG_k) > > /* > - * A vendor wants to replace an old_content, but another vendor has used > - * ALTERNATIVE() to patch its customized content at the same location. In > - * this case, this vendor can create a new macro ALTERNATIVE_2() based > - * on the following sample code and then replace ALTERNATIVE() with > - * ALTERNATIVE_2() to append its customized content. > + * ALTERNATIVE_x macros allow providing multiple replacement options > + * for an ALTERNATIVE code section. This is helpful if multiple > + * implementation variants for the same functionality exist for > + * different cpu cores. > + * > + * Usage: > + * ALTERNATIVE_x(old_content, > + * new_content1, vendor_id1, errata_id1, CONFIG_k1, > + * new_content2, vendor_id2, errata_id2, CONFIG_k2, > + * ... > + * new_contentx, vendor_idx, errata_idx, CONFIG_kx) > */ > #define ALTERNATIVE_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ > new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2) \ > _ALTERNATIVE_CFG_2(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ > new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2) > > +#define ALTERNATIVE_3(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ > + new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2, \ > + new_content_3, vendor_id_3, errata_id_3, CONFIG_k_3) \ > + _ALTERNATIVE_CFG_3(old_content, new_content_1, vendor_id_1, errata_id_1, CONFIG_k_1, \ > + new_content_2, vendor_id_2, errata_id_2, CONFIG_k_2, \ > + new_content_3, vendor_id_3, errata_id_3, CONFIG_k_3) > + > #endif >
