From 894f1d58d93073d290f35d1090b03717bc7b4dc0 Mon Sep 17 00:00:00 2001 From: Victor Kamensky Date: Mon, 19 Oct 2020 15:21:45 -0700 Subject: Revert "qemu: add 34Kf-64tlb fictitious cpu type" This reverts commit 4470a04943352224955f17e004962f0f9e1c9b0c. Will be replaced with upstreamed solution instead, that just bumped number of TLBs to 64 in original 34Kf CPU model. Signed-off-by: Richard Purdie --- meta/recipes-devtools/qemu/qemu.inc | 1 - ...Kf-64tlb-fictitious-cpu-type-like-34Kf-bu.patch | 118 --------------------- 2 files changed, 119 deletions(-) delete mode 100644 meta/recipes-devtools/qemu/qemu/0001-mips-add-34Kf-64tlb-fictitious-cpu-type-like-34Kf-bu.patch (limited to 'meta/recipes-devtools') diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc index 6c0edcb706..bbb9038961 100644 --- a/meta/recipes-devtools/qemu/qemu.inc +++ b/meta/recipes-devtools/qemu/qemu.inc @@ -31,7 +31,6 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \ file://0001-qemu-Do-not-include-file-if-not-exists.patch \ file://find_datadir.patch \ file://usb-fix-setup_len-init.patch \ - file://0001-mips-add-34Kf-64tlb-fictitious-cpu-type-like-34Kf-bu.patch \ " UPSTREAM_CHECK_REGEX = "qemu-(?P\d+(\.\d+)+)\.tar" diff --git a/meta/recipes-devtools/qemu/qemu/0001-mips-add-34Kf-64tlb-fictitious-cpu-type-like-34Kf-bu.patch b/meta/recipes-devtools/qemu/qemu/0001-mips-add-34Kf-64tlb-fictitious-cpu-type-like-34Kf-bu.patch deleted file mode 100644 index b6312e1543..0000000000 --- a/meta/recipes-devtools/qemu/qemu/0001-mips-add-34Kf-64tlb-fictitious-cpu-type-like-34Kf-bu.patch +++ /dev/null @@ -1,118 +0,0 @@ -From b3fcc7d96523ad8e3ea28c09d495ef08529d01ce Mon Sep 17 00:00:00 2001 -From: Victor Kamensky -Date: Wed, 7 Oct 2020 10:19:42 -0700 -Subject: [PATCH] mips: add 34Kf-64tlb fictitious cpu type like 34Kf but with - 64 TLBs - -In Yocto Project CI runs it was observed that test run -of 32 bit mips image takes almost twice longer than 64 bit -mips image with the same logical load and CI execution -hits timeout. - -See https://bugzilla.yoctoproject.org/show_bug.cgi?id=13992 - -Yocto project uses 34Kf cpu type to run 32 bit mips image, -and MIPS64R2-generic cpu type to run 64 bit mips64 image. - -Upon qemu behavior differences investigation between mips -and mips64 two prominent observations came up: under -logically similar load (same definition and configuration -of user-land image) in case of mips get_physical_address -function is called almost twice more often, meaning -twice more memory accesses involved in this case. Also -number of tlbwr instruction executed (r4k_helper_tlbwr -qemu function) almost 16 time bigger in mips case than in -mips64. - -It turns out that 34Kf cpu has 16 TLBs, but in case of -MIPS64R2-generic it is 64 TLBs. So that explains why -some many more tlbwr had to be execute by kernel TLB refill -handler in case of 32 bit misp. - -The idea of the fix is to come up with new 34Kf-64tlb fictitious -cpu type, that would behave exactly as 34Kf but it would -contain 64 TLBs to reduce TLB trashing. After all, adding -more TLBs to soft mmu is easy. - -Experiment with some significant non-trvial load in Yocto -environment by running do_testimage load shows that 34Kf-64tlb -cpu performs 40% or so better than original 34Kf cpu wrt test -execution real time. - -It is not ideal to have cpu type that does not exist in the -wild but given performance gains it seems to be justified. - -Signed-off-by: Victor Kamensky ---- - target/mips/translate_init.inc.c | 55 ++++++++++++++++++++++++++++++++++++++++ - 1 file changed, 55 insertions(+) - -diff --git a/target/mips/translate_init.inc.c b/target/mips/translate_init.inc.c -index 637caccd89..b73ab48231 100644 ---- a/target/mips/translate_init.inc.c -+++ b/target/mips/translate_init.inc.c -@@ -297,6 +297,61 @@ const mips_def_t mips_defs[] = - .insn_flags = CPU_MIPS32R2 | ASE_MIPS16 | ASE_DSP | ASE_MT, - .mmu_type = MMU_TYPE_R4000, - }, -+ /* -+ * Verbatim copy of "34Kf" cpu, only bumped up number of TLB entries -+ * from 16 to 64 (see CP0_Config0 value at CP0C1_MMU bits) to improve -+ * performance by reducing number of TLB refill exceptions and -+ * eliminating need to run all corresponding TLB refill handling -+ * instructions. -+ */ -+ { -+ .name = "34Kf-64tlb", -+ .CP0_PRid = 0x00019500, -+ .CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR) | -+ (MMU_TYPE_R4000 << CP0C0_MT), -+ .CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (63 << CP0C1_MMU) | -+ (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) | -+ (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA) | -+ (1 << CP0C1_CA), -+ .CP0_Config2 = MIPS_CONFIG2, -+ .CP0_Config3 = MIPS_CONFIG3 | (1 << CP0C3_VInt) | (1 << CP0C3_MT) | -+ (1 << CP0C3_DSPP), -+ .CP0_LLAddr_rw_bitmask = 0, -+ .CP0_LLAddr_shift = 0, -+ .SYNCI_Step = 32, -+ .CCRes = 2, -+ .CP0_Status_rw_bitmask = 0x3778FF1F, -+ .CP0_TCStatus_rw_bitmask = (0 << CP0TCSt_TCU3) | (0 << CP0TCSt_TCU2) | -+ (1 << CP0TCSt_TCU1) | (1 << CP0TCSt_TCU0) | -+ (0 << CP0TCSt_TMX) | (1 << CP0TCSt_DT) | -+ (1 << CP0TCSt_DA) | (1 << CP0TCSt_A) | -+ (0x3 << CP0TCSt_TKSU) | (1 << CP0TCSt_IXMT) | -+ (0xff << CP0TCSt_TASID), -+ .CP1_fcr0 = (1 << FCR0_F64) | (1 << FCR0_L) | (1 << FCR0_W) | -+ (1 << FCR0_D) | (1 << FCR0_S) | (0x95 << FCR0_PRID), -+ .CP1_fcr31 = 0, -+ .CP1_fcr31_rw_bitmask = 0xFF83FFFF, -+ .CP0_SRSCtl = (0xf << CP0SRSCtl_HSS), -+ .CP0_SRSConf0_rw_bitmask = 0x3fffffff, -+ .CP0_SRSConf0 = (1U << CP0SRSC0_M) | (0x3fe << CP0SRSC0_SRS3) | -+ (0x3fe << CP0SRSC0_SRS2) | (0x3fe << CP0SRSC0_SRS1), -+ .CP0_SRSConf1_rw_bitmask = 0x3fffffff, -+ .CP0_SRSConf1 = (1U << CP0SRSC1_M) | (0x3fe << CP0SRSC1_SRS6) | -+ (0x3fe << CP0SRSC1_SRS5) | (0x3fe << CP0SRSC1_SRS4), -+ .CP0_SRSConf2_rw_bitmask = 0x3fffffff, -+ .CP0_SRSConf2 = (1U << CP0SRSC2_M) | (0x3fe << CP0SRSC2_SRS9) | -+ (0x3fe << CP0SRSC2_SRS8) | (0x3fe << CP0SRSC2_SRS7), -+ .CP0_SRSConf3_rw_bitmask = 0x3fffffff, -+ .CP0_SRSConf3 = (1U << CP0SRSC3_M) | (0x3fe << CP0SRSC3_SRS12) | -+ (0x3fe << CP0SRSC3_SRS11) | (0x3fe << CP0SRSC3_SRS10), -+ .CP0_SRSConf4_rw_bitmask = 0x3fffffff, -+ .CP0_SRSConf4 = (0x3fe << CP0SRSC4_SRS15) | -+ (0x3fe << CP0SRSC4_SRS14) | (0x3fe << CP0SRSC4_SRS13), -+ .SEGBITS = 32, -+ .PABITS = 32, -+ .insn_flags = CPU_MIPS32R2 | ASE_MIPS16 | ASE_DSP | ASE_MT, -+ .mmu_type = MMU_TYPE_R4000, -+ }, - { - .name = "74Kf", - .CP0_PRid = 0x00019700, --- -2.14.5 - -- cgit 1.2.3-korg