diff options
Diffstat (limited to 'target/linux/lantiq/patches-3.3/0018-cache-split.patch')
| -rw-r--r-- | target/linux/lantiq/patches-3.3/0018-cache-split.patch | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.3/0018-cache-split.patch b/target/linux/lantiq/patches-3.3/0018-cache-split.patch new file mode 100644 index 0000000..c571a45 --- /dev/null +++ b/target/linux/lantiq/patches-3.3/0018-cache-split.patch @@ -0,0 +1,321 @@ +From d38bc3854ee2fb9d3e6080b89dd6774dd5d39c2b Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Thu, 29 Sep 2011 20:31:54 +0200 +Subject: [PATCH 18/25] cache split + +--- + arch/mips/Kconfig | 22 ++++++ + arch/mips/kernel/vpe.c | 66 ++++++++++++++++++ + arch/mips/mm/c-r4k.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 260 insertions(+), 0 deletions(-) + +diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig +index e152c85..39e698f 100644 +--- a/arch/mips/Kconfig ++++ b/arch/mips/Kconfig +@@ -1955,6 +1955,28 @@ config IFX_VPE_EXT + help + IFX included extensions in APRP + ++config IFX_VPE_CACHE_SPLIT ++ bool "IFX Cache Split Ways" ++ depends on IFX_VPE_EXT ++ help ++ IFX extension for reserving (splitting) cache ways among VPEs. You must ++ give kernel command line arguments vpe_icache_shared=0 or ++ vpe_dcache_shared=0 to enable splitting of icache or dcache ++ respectively. Then you can specify which cache ways should be ++ assigned to which VPE. There are total 8 cache ways, 4 each ++ for dcache and icache: dcache_way0, dcache_way1,dcache_way2, ++ dcache_way3 and icache_way0,icache_way1, icache_way2,icache_way3. ++ ++ For example, if you specify vpe_icache_shared=0 and icache_way2=1, ++ then the 3rd icache way will be assigned to VPE0 and denied in VPE1. ++ ++ For icache, software is required to make at least one cache way available ++ for a VPE at all times i.e., one can't assign all the icache ways to one ++ VPE. ++ ++ By default, vpe_dcache_shared and vpe_icache_shared are set to 1 ++ (i.e., both icache and dcache are shared among VPEs) ++ + config PERFCTRS + bool "34K Performance counters" + depends on MIPS_MT && PROC_FS +diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c +index e338ba5..0511d11 100644 +--- a/arch/mips/kernel/vpe.c ++++ b/arch/mips/kernel/vpe.c +@@ -127,6 +127,13 @@ __setup("vpe1_wdog_timeout=", wdog_timeout); + EXPORT_SYMBOL(vpe1_wdog_timeout); + + #endif ++ ++#ifdef CONFIG_IFX_VPE_CACHE_SPLIT /* Code for splitting the cache ways among VPEs. */ ++extern int vpe_icache_shared,vpe_dcache_shared; ++extern int icache_way0,icache_way1,icache_way2,icache_way3; ++extern int dcache_way0,dcache_way1,dcache_way2,dcache_way3; ++#endif ++ + /* grab the likely amount of memory we will need. */ + #ifdef CONFIG_MIPS_VPE_LOADER_TOM + #define P_SIZE (2 * 1024 * 1024) +@@ -865,6 +872,65 @@ static int vpe_run(struct vpe * v) + /* enable this VPE */ + write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA); + ++#ifdef CONFIG_IFX_VPE_CACHE_SPLIT ++ if ( (!vpe_icache_shared) || (!vpe_dcache_shared) ) { ++ ++ /* PCP bit must be 1 to split the cache */ ++ if(read_c0_mvpconf0() & MVPCONF0_PCP) { ++ ++ if ( !vpe_icache_shared ){ ++ write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0()) & ~VPECONF0_ICS); ++ ++ /* ++ * If any cache way is 1, then that way is denied ++ * in VPE1. Otherwise assign that way to VPE1. ++ */ ++ if (!icache_way0) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX0 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX0 ); ++ if (!icache_way1) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX1 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX1 ); ++ if (!icache_way2) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX2 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX2 ); ++ if (!icache_way3) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_IWX3 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_IWX3 ); ++ } ++ ++ if ( !vpe_dcache_shared ) { ++ write_vpe_c0_vpeconf0((read_vpe_c0_vpeconf0()) & ~VPECONF0_DCS); ++ ++ /* ++ * If any cache way is 1, then that way is denied ++ * in VPE1. Otherwise assign that way to VPE1. ++ */ ++ if (!dcache_way0) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX0 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX0 ); ++ if (!dcache_way1) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX1 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX1 ); ++ if (!dcache_way2) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX2 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX2 ); ++ if (!dcache_way3) ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() | VPEOPT_DWX3 ); ++ else ++ write_vpe_c0_vpeopt(read_vpe_c0_vpeopt() & ~VPEOPT_DWX3 ); ++ } ++ } ++ } ++#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */ ++ + /* clear out any left overs from a previous program */ + write_vpe_c0_status(0); + write_vpe_c0_cause(0); +diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c +index de3475e..41aee8b 100644 +--- a/arch/mips/mm/c-r4k.c ++++ b/arch/mips/mm/c-r4k.c +@@ -1389,6 +1389,106 @@ static int __init setcoherentio(char *str) + __setup("coherentio", setcoherentio); + #endif + ++#ifdef CONFIG_IFX_VPE_CACHE_SPLIT /* Code for splitting the cache ways among VPEs. */ ++ ++#include <asm/mipsmtregs.h> ++ ++/* ++ * By default, vpe_icache_shared and vpe_dcache_shared ++ * values are 1 i.e., both icache and dcache are shared ++ * among the VPEs. ++ */ ++ ++int vpe_icache_shared = 1; ++static int __init vpe_icache_shared_val(char *str) ++{ ++ get_option(&str, &vpe_icache_shared); ++ return 1; ++} ++__setup("vpe_icache_shared=", vpe_icache_shared_val); ++EXPORT_SYMBOL(vpe_icache_shared); ++ ++int vpe_dcache_shared = 1; ++static int __init vpe_dcache_shared_val(char *str) ++{ ++ get_option(&str, &vpe_dcache_shared); ++ return 1; ++} ++__setup("vpe_dcache_shared=", vpe_dcache_shared_val); ++EXPORT_SYMBOL(vpe_dcache_shared); ++ ++/* ++ * Software is required to make atleast one icache ++ * way available for a VPE at all times i.e., one ++ * can't assign all the icache ways to one VPE. ++ */ ++ ++int icache_way0 = 0; ++static int __init icache_way0_val(char *str) ++{ ++ get_option(&str, &icache_way0); ++ return 1; ++} ++__setup("icache_way0=", icache_way0_val); ++ ++int icache_way1 = 0; ++static int __init icache_way1_val(char *str) ++{ ++ get_option(&str, &icache_way1); ++ return 1; ++} ++__setup("icache_way1=", icache_way1_val); ++ ++int icache_way2 = 0; ++static int __init icache_way2_val(char *str) ++{ ++ get_option(&str, &icache_way2); ++ return 1; ++} ++__setup("icache_way2=", icache_way2_val); ++ ++int icache_way3 = 0; ++static int __init icache_way3_val(char *str) ++{ ++ get_option(&str, &icache_way3); ++ return 1; ++} ++__setup("icache_way3=", icache_way3_val); ++ ++int dcache_way0 = 0; ++static int __init dcache_way0_val(char *str) ++{ ++ get_option(&str, &dcache_way0); ++ return 1; ++} ++__setup("dcache_way0=", dcache_way0_val); ++ ++int dcache_way1 = 0; ++static int __init dcache_way1_val(char *str) ++{ ++ get_option(&str, &dcache_way1); ++ return 1; ++} ++__setup("dcache_way1=", dcache_way1_val); ++ ++int dcache_way2 = 0; ++static int __init dcache_way2_val(char *str) ++{ ++ get_option(&str, &dcache_way2); ++ return 1; ++} ++__setup("dcache_way2=", dcache_way2_val); ++ ++int dcache_way3 = 0; ++static int __init dcache_way3_val(char *str) ++{ ++ get_option(&str, &dcache_way3); ++ return 1; ++} ++__setup("dcache_way3=", dcache_way3_val); ++ ++#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */ ++ + void __cpuinit r4k_cache_init(void) + { + extern void build_clear_page(void); +@@ -1408,6 +1508,78 @@ void __cpuinit r4k_cache_init(void) + break; + } + ++#ifdef CONFIG_IFX_VPE_CACHE_SPLIT ++ /* ++ * We split the cache ways appropriately among the VPEs ++ * based on cache ways values we received as command line ++ * arguments ++ */ ++ if ( (!vpe_icache_shared) || (!vpe_dcache_shared) ){ ++ ++ /* PCP bit must be 1 to split the cache */ ++ if(read_c0_mvpconf0() & MVPCONF0_PCP) { ++ ++ /* Set CPA bit which enables us to modify VPEOpt register */ ++ write_c0_mvpcontrol((read_c0_mvpcontrol()) | MVPCONTROL_CPA); ++ ++ if ( !vpe_icache_shared ){ ++ write_c0_vpeconf0((read_c0_vpeconf0()) & ~VPECONF0_ICS); ++ /* ++ * If any cache way is 1, then that way is denied ++ * in VPE0. Otherwise assign that way to VPE0. ++ */ ++ printk(KERN_DEBUG "icache is split\n"); ++ printk(KERN_DEBUG "icache_way0=%d icache_way1=%d icache_way2=%d icache_way3=%d\n", ++ icache_way0, icache_way1,icache_way2, icache_way3); ++ if (icache_way0) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX0 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX0 ); ++ if (icache_way1) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX1 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX1 ); ++ if (icache_way2) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX2 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX2 ); ++ if (icache_way3) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_IWX3 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_IWX3 ); ++ } ++ ++ if ( !vpe_dcache_shared ) { ++ /* ++ * If any cache way is 1, then that way is denied ++ * in VPE0. Otherwise assign that way to VPE0. ++ */ ++ printk(KERN_DEBUG "dcache is split\n"); ++ printk(KERN_DEBUG "dcache_way0=%d dcache_way1=%d dcache_way2=%d dcache_way3=%d\n", ++ dcache_way0, dcache_way1, dcache_way2, dcache_way3); ++ write_c0_vpeconf0((read_c0_vpeconf0()) & ~VPECONF0_DCS); ++ if (dcache_way0) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX0 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX0 ); ++ if (dcache_way1) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX1 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX1 ); ++ if (dcache_way2) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX2 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX2 ); ++ if (dcache_way3) ++ write_c0_vpeopt(read_c0_vpeopt() | VPEOPT_DWX3 ); ++ else ++ write_c0_vpeopt(read_c0_vpeopt() & ~VPEOPT_DWX3 ); ++ } ++ } ++ } ++ ++#endif /* endif CONFIG_IFX_VPE_CACHE_SPLIT */ ++ + probe_pcache(); + setup_scache(); + +-- +1.7.9.1 + |