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Re: [PATCH v5 1/5] target/ppc: reduce code duplication across Power9/10

From: BALATON Zoltan
Subject: Re: [PATCH v5 1/5] target/ppc: reduce code duplication across Power9/10 init code
Date: Wed, 24 Jul 2024 14:04:06 +0200 (CEST) 
On Wed, 24 Jul 2024, Aditya Gupta wrote:

Hi Nick,


While doing the renaming, codes similar to this come up:



#define PPC_INSNS_FLAGS_POWER9                                      \
     PPC_INSNS_BASE | PPC_ISEL | PPC_STRING | PPC_MFTB |             \
     PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |                   \
     PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE | PPC_FLOAT_FRSQRTES |      \
    PPC_FLOAT_STFIWX | PPC_FLOAT_EXT |PPC_CACHE | PPC_CACHE_ICBI |  \
     PPC_CACHE_DCBZ | PPC_MEM_SYNC | PPC_MEM_EIEIO | PPC_MEM_TLBIE | \
     PPC_MEM_TLBSYNC | PPC_64B | PPC_64H | PPC_64BX | PPC_ALTIVEC |  \
     PPC_SEGMENT_64B | PPC_SLBI | PPC_POPCNTB | PPC_POPCNTWD |       \
    PPC_CILDST
Will flag names starting with POWERPC_* be better ? (eg. POWERPC_INSNS_FLAGS_POWER9)
Idea behind that is, that POWERPC_* are the ones expected to be used in code, and the PPC_* are the flags that can be used in header files like this to make up some complex flags.
In above case, `PPC_INSNS_FLAGS_POWER9` and `PPC_INSNS_BASE` seem somewhat similar to me, but are very different considering the values. 

What do you think ?
These are already prefixed with PPC_INSNS_ instead of just PPC_ so they are already distinguished enough IMO. Having mixed POWERPC_ and PPC_ prefix might be more confusing than helpful but that's just my opinion. 

Regards,
BALATON Zoltan




- Aditya Gupta


On 23/07/24 10:52, Nicholas Piggin wrote:

On Thu Jun 6, 2024 at 10:16 PM AEST, Aditya Gupta wrote:

From: Harsh Prateek Bora <harshpb@linux.ibm.com>

Power9/10 initialization code consists of a lot of logical OR of
various flag bits as supported by respective Power platform during its
initialization, most of which is duplicated and only selected bits are
added or removed as needed with each new platform support being added.
Remove the duplicate code and share using common macros.

Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
---
  target/ppc/cpu_init.c | 124 +++++-------------------------------------
  target/ppc/cpu_init.h |  78 ++++++++++++++++++++++++++
  2 files changed, 93 insertions(+), 109 deletions(-)
  create mode 100644 target/ppc/cpu_init.h

diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 01e358a4a5ac..3d8a112935ae 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -51,6 +51,7 @@
  #include "kvm_ppc.h"
  #endif
  +#include "cpu_init.h"
  /* #define PPC_DEBUG_SPR */
  /* #define USE_APPLE_GDB */
@@ -6508,58 +6509,15 @@ POWERPC_FAMILY(POWER9)(ObjectClass *oc, void *data) 
      dc->fw_name = "PowerPC,POWER9";
      dc->desc = "POWER9";
      pcc->pvr_match = ppc_pvr_match_power9;
-    pcc->pcr_mask = PCR_COMPAT_2_05 | PCR_COMPAT_2_06 | PCR_COMPAT_2_07;
- pcc->pcr_supported = PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | 
-                         PCR_COMPAT_2_05;
+    pcc->pcr_mask = POWERPC_POWER9_PCC_PCR_MASK;
+    pcc->pcr_supported = POWERPC_POWER9_PCC_PCR_SUPPORTED;
      pcc->init_proc = init_proc_POWER9;
      pcc->check_pow = check_pow_nocheck;
      pcc->check_attn = check_attn_hid0_power9;
- pcc->insns_flags = PPC_INSNS_BASE | PPC_ISEL | PPC_STRING | PPC_MFTB | 
-                       PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |
-                       PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |
-                       PPC_FLOAT_FRSQRTES |
-                       PPC_FLOAT_STFIWX |
-                       PPC_FLOAT_EXT |
-                       PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |
-                       PPC_MEM_SYNC | PPC_MEM_EIEIO |
-                       PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |
-                       PPC_64B | PPC_64H | PPC_64BX | PPC_ALTIVEC |
-                       PPC_SEGMENT_64B | PPC_SLBI |
-                       PPC_POPCNTB | PPC_POPCNTWD |
-                       PPC_CILDST;
-    pcc->insns_flags2 = PPC2_VSX | PPC2_VSX207 | PPC2_DFP | PPC2_DBRX |
-                        PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 |
-                        PPC2_ATOMIC_ISA206 | PPC2_FP_CVT_ISA206 |
-                        PPC2_FP_TST_ISA206 | PPC2_BCTAR_ISA207 |
-                        PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
-                        PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 |
- PPC2_TM | PPC2_ISA300 | PPC2_PRCNTL | PPC2_MEM_LWSYNC | 
-                        PPC2_BCDA_ISA206;
-    pcc->msr_mask = (1ull << MSR_SF) |
-                    (1ull << MSR_HV) |
-                    (1ull << MSR_TM) |
-                    (1ull << MSR_VR) |
-                    (1ull << MSR_VSX) |
-                    (1ull << MSR_EE) |
-                    (1ull << MSR_PR) |
-                    (1ull << MSR_FP) |
-                    (1ull << MSR_ME) |
-                    (1ull << MSR_FE0) |
-                    (1ull << MSR_SE) |
-                    (1ull << MSR_DE) |
-                    (1ull << MSR_FE1) |
-                    (1ull << MSR_IR) |
-                    (1ull << MSR_DR) |
-                    (1ull << MSR_PMM) |
-                    (1ull << MSR_RI) |
-                    (1ull << MSR_LE);
-    pcc->lpcr_mask = LPCR_VPM1 | LPCR_ISL | LPCR_KBV | LPCR_DPFD |
-        (LPCR_PECE_U_MASK & LPCR_HVEE) | LPCR_ILE | LPCR_AIL |
-        LPCR_UPRT | LPCR_EVIRT | LPCR_ONL | LPCR_HR | LPCR_LD |
-        (LPCR_PECE_L_MASK & (LPCR_PDEE | LPCR_HDEE | LPCR_EEE |
-                             LPCR_DEE | LPCR_OEE))
-        | LPCR_MER | LPCR_GTSE | LPCR_TC |
-        LPCR_HEIC | LPCR_LPES0 | LPCR_HVICE | LPCR_HDICE;
+    pcc->insns_flags = POWERPC_FAMILY_POWER9_INSNS_FLAGS;
+    pcc->insns_flags2 = POWERPC_FAMILY_POWER9_INSNS_FLAGS2;
+    pcc->msr_mask = POWERPC_POWER9_PCC_MSR_MASK;
+    pcc->lpcr_mask = POWERPC_POWER9_PCC_LPCR_MASK;
pcc->lpcr_pm = LPCR_PDEE | LPCR_HDEE | LPCR_EEE | LPCR_DEE | LPCR_OEE; 
      pcc->mmu_model = POWERPC_MMU_3_00;
  #if !defined(CONFIG_USER_ONLY)
@@ -6572,10 +6530,7 @@ POWERPC_FAMILY(POWER9)(ObjectClass *oc, void *data)
      pcc->excp_model = POWERPC_EXCP_POWER9;
      pcc->bus_model = PPC_FLAGS_INPUT_POWER9;
      pcc->bfd_mach = bfd_mach_ppc64;
-    pcc->flags = POWERPC_FLAG_VRE | POWERPC_FLAG_SE |
-                 POWERPC_FLAG_BE | POWERPC_FLAG_PMM |
-                 POWERPC_FLAG_BUS_CLK | POWERPC_FLAG_CFAR |
-                 POWERPC_FLAG_VSX | POWERPC_FLAG_TM | POWERPC_FLAG_SCV;
+    pcc->flags = POWERPC_POWER9_PCC_FLAGS;
      pcc->l1_dcache_size = 0x8000;
      pcc->l1_icache_size = 0x8000;
  }
@@ -6688,60 +6643,15 @@ POWERPC_FAMILY(POWER10)(ObjectClass *oc, void *data) 
      dc->fw_name = "PowerPC,POWER10";
      dc->desc = "POWER10";
      pcc->pvr_match = ppc_pvr_match_power10;
-    pcc->pcr_mask = PCR_COMPAT_2_05 | PCR_COMPAT_2_06 | PCR_COMPAT_2_07 |
-                    PCR_COMPAT_3_00;
- pcc->pcr_supported = PCR_COMPAT_3_10 | PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | 
-                         PCR_COMPAT_2_06 | PCR_COMPAT_2_05;
+    pcc->pcr_mask = POWERPC_POWER10_PCC_PCR_MASK;
+    pcc->pcr_supported = POWERPC_POWER10_PCC_PCR_SUPPORTED;
      pcc->init_proc = init_proc_POWER10;
      pcc->check_pow = check_pow_nocheck;
      pcc->check_attn = check_attn_hid0_power9;
- pcc->insns_flags = PPC_INSNS_BASE | PPC_ISEL | PPC_STRING | PPC_MFTB | 
-                       PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |
-                       PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE |
-                       PPC_FLOAT_FRSQRTES |
-                       PPC_FLOAT_STFIWX |
-                       PPC_FLOAT_EXT |
-                       PPC_CACHE | PPC_CACHE_ICBI | PPC_CACHE_DCBZ |
-                       PPC_MEM_SYNC | PPC_MEM_EIEIO |
-                       PPC_MEM_TLBIE | PPC_MEM_TLBSYNC |
-                       PPC_64B | PPC_64H | PPC_64BX | PPC_ALTIVEC |
-                       PPC_SEGMENT_64B | PPC_SLBI |
-                       PPC_POPCNTB | PPC_POPCNTWD |
-                       PPC_CILDST;
-    pcc->insns_flags2 = PPC2_VSX | PPC2_VSX207 | PPC2_DFP | PPC2_DBRX |
-                        PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 |
-                        PPC2_ATOMIC_ISA206 | PPC2_FP_CVT_ISA206 |
-                        PPC2_FP_TST_ISA206 | PPC2_BCTAR_ISA207 |
-                        PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 |
-                        PPC2_ISA205 | PPC2_ISA207S | PPC2_FP_CVT_S64 |
-                        PPC2_ISA300 | PPC2_PRCNTL | PPC2_ISA310 |
-                        PPC2_MEM_LWSYNC | PPC2_BCDA_ISA206;
-    pcc->msr_mask = (1ull << MSR_SF) |
-                    (1ull << MSR_HV) |
-                    (1ull << MSR_VR) |
-                    (1ull << MSR_VSX) |
-                    (1ull << MSR_EE) |
-                    (1ull << MSR_PR) |
-                    (1ull << MSR_FP) |
-                    (1ull << MSR_ME) |
-                    (1ull << MSR_FE0) |
-                    (1ull << MSR_SE) |
-                    (1ull << MSR_DE) |
-                    (1ull << MSR_FE1) |
-                    (1ull << MSR_IR) |
-                    (1ull << MSR_DR) |
-                    (1ull << MSR_PMM) |
-                    (1ull << MSR_RI) |
-                    (1ull << MSR_LE);
-    pcc->lpcr_mask = LPCR_VPM1 | LPCR_ISL | LPCR_KBV | LPCR_DPFD |
-        (LPCR_PECE_U_MASK & LPCR_HVEE) | LPCR_ILE | LPCR_AIL |
-        LPCR_UPRT | LPCR_EVIRT | LPCR_ONL | LPCR_HR | LPCR_LD |
-        (LPCR_PECE_L_MASK & (LPCR_PDEE | LPCR_HDEE | LPCR_EEE |
-                             LPCR_DEE | LPCR_OEE))
-        | LPCR_MER | LPCR_GTSE | LPCR_TC |
-        LPCR_HEIC | LPCR_LPES0 | LPCR_HVICE | LPCR_HDICE;
-    /* DD2 adds an extra HAIL bit */
-    pcc->lpcr_mask |= LPCR_HAIL;
+ pcc->insns_flags = POWERPC_FAMILY_POWER9_INSNS_FLAGS; /* same as P9 */ 
+    pcc->insns_flags2 = POWERPC_FAMILY_POWER10_INSNS_FLAGS2;
+    pcc->msr_mask = POWERPC_POWER10_PCC_MSR_MASK;
+    pcc->lpcr_mask = POWERPC_POWER10_PCC_LPCR_MASK;
pcc->lpcr_pm = LPCR_PDEE | LPCR_HDEE | LPCR_EEE | LPCR_DEE | LPCR_OEE; 
      pcc->mmu_model = POWERPC_MMU_3_00;
@@ -6754,11 +6664,7 @@ POWERPC_FAMILY(POWER10)(ObjectClass *oc, void *data) 
      pcc->excp_model = POWERPC_EXCP_POWER10;
      pcc->bus_model = PPC_FLAGS_INPUT_POWER9;
      pcc->bfd_mach = bfd_mach_ppc64;
-    pcc->flags = POWERPC_FLAG_VRE | POWERPC_FLAG_SE |
-                 POWERPC_FLAG_BE | POWERPC_FLAG_PMM |
-                 POWERPC_FLAG_BUS_CLK | POWERPC_FLAG_CFAR |
-                 POWERPC_FLAG_VSX | POWERPC_FLAG_SCV |
-                 POWERPC_FLAG_BHRB;
+    pcc->flags = POWERPC_POWER10_PCC_FLAGS;
      pcc->l1_dcache_size = 0x8000;
      pcc->l1_icache_size = 0x8000;
  }
diff --git a/target/ppc/cpu_init.h b/target/ppc/cpu_init.h
new file mode 100644
index 000000000000..e04be6a655d8
--- /dev/null
+++ b/target/ppc/cpu_init.h
@@ -0,0 +1,78 @@
+#ifndef TARGET_PPC_CPU_INIT_H
+#define TARGET_PPC_CPU_INIT_H
+
+#define POWERPC_FAMILY_POWER9_INSNS_FLAGS                           \

I would call this PPC_INSNS_FLAGS_POWER9


+    PPC_INSNS_BASE | PPC_ISEL | PPC_STRING | PPC_MFTB |             \
+    PPC_FLOAT | PPC_FLOAT_FSEL | PPC_FLOAT_FRES |                   \
+    PPC_FLOAT_FSQRT | PPC_FLOAT_FRSQRTE | PPC_FLOAT_FRSQRTES |      \
+    PPC_FLOAT_STFIWX | PPC_FLOAT_EXT |PPC_CACHE | PPC_CACHE_ICBI |  \
+    PPC_CACHE_DCBZ | PPC_MEM_SYNC | PPC_MEM_EIEIO | PPC_MEM_TLBIE | \
+    PPC_MEM_TLBSYNC | PPC_64B | PPC_64H | PPC_64BX | PPC_ALTIVEC |  \
+    PPC_SEGMENT_64B | PPC_SLBI | PPC_POPCNTB | PPC_POPCNTWD |       \
+    PPC_CILDST

Add this here

#define PPC_INSNS_FLAGS_POWER10 PPC_INSNS_FLAGS_POWER9


+
+#define POWERPC_FAMILY_POWER9_INSNS_FLAGS2_COMMON                   \

Suggest some other name change -

            PPC_INSNS_FLAGS2_POWER_COMMON


+    PPC2_VSX | PPC2_VSX207 | PPC2_DFP | PPC2_DBRX |                 \
+    PPC2_PERM_ISA206 | PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 |      \
+    PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206 | PPC2_BCTAR_ISA207 |   \
+    PPC2_LSQ_ISA207 | PPC2_ALTIVEC_207 | PPC2_ISA205 |              \
+    PPC2_ISA207S | PPC2_FP_CVT_S64 | PPC2_ISA300 | PPC2_PRCNTL |    \
+    PPC2_MEM_LWSYNC | PPC2_BCDA_ISA206
+
+#define POWERPC_FAMILY_POWER9_INSNS_FLAGS2                          \
+    POWERPC_FAMILY_POWER9_INSNS_FLAGS2_COMMON | PPC2_TM
+#define POWERPC_FAMILY_POWER10_INSNS_FLAGS2                         \
+    POWERPC_FAMILY_POWER9_INSNS_FLAGS2_COMMON | PPC2_ISA310
+
+#define POWERPC_POWER9_COMMON_PCC_MSR_MASK \

PPC_MSR_MASK_POWER_COMMON


+    (1ull << MSR_SF) |                     \
+    (1ull << MSR_HV) |                     \
+    (1ull << MSR_VR) |                     \
+    (1ull << MSR_VSX) |                    \
+    (1ull << MSR_EE) |                     \
+    (1ull << MSR_PR) |                     \
+    (1ull << MSR_FP) |                     \
+    (1ull << MSR_ME) |                     \
+    (1ull << MSR_FE0) |                    \
+    (1ull << MSR_SE) |                     \
+    (1ull << MSR_DE) |                     \
+    (1ull << MSR_FE1) |                    \
+    (1ull << MSR_IR) |                     \
+    (1ull << MSR_DR) |                     \
+    (1ull << MSR_PMM) |                    \
+    (1ull << MSR_RI) |                     \
+    (1ull << MSR_LE)
+
+#define POWERPC_POWER9_PCC_MSR_MASK \
+    POWERPC_POWER9_COMMON_PCC_MSR_MASK | (1ull << MSR_TM)

PPC_MSR_MASK_POWER9


+#define POWERPC_POWER10_PCC_MSR_MASK \
+    POWERPC_POWER9_COMMON_PCC_MSR_MASK
+#define POWERPC_POWER9_PCC_PCR_MASK \

PPC_PCR_MASK_POWER9


+    PCR_COMPAT_2_05 | PCR_COMPAT_2_06 | PCR_COMPAT_2_07
+#define POWERPC_POWER10_PCC_PCR_MASK \
+    POWERPC_POWER9_PCC_PCR_MASK | PCR_COMPAT_3_00
+#define POWERPC_POWER9_PCC_PCR_SUPPORTED \

PPC_PCR_SUPPORED_POWER9

etc


+    PCR_COMPAT_3_00 | PCR_COMPAT_2_07 | PCR_COMPAT_2_06 | PCR_COMPAT_2_05
+#define POWERPC_POWER10_PCC_PCR_SUPPORTED \
+    POWERPC_POWER9_PCC_PCR_SUPPORTED | PCR_COMPAT_3_10
+#define POWERPC_POWER9_PCC_LPCR_MASK \ + LPCR_VPM1 | LPCR_ISL | LPCR_KBV | LPCR_DPFD | \ + (LPCR_PECE_U_MASK & LPCR_HVEE) | LPCR_ILE | LPCR_AIL | \ + LPCR_UPRT | LPCR_EVIRT | LPCR_ONL | LPCR_HR | LPCR_LD | \ + (LPCR_PECE_L_MASK & (LPCR_PDEE|LPCR_HDEE|LPCR_EEE|LPCR_DEE|LPCR_OEE)) | \ + LPCR_MER | LPCR_GTSE | LPCR_TC | LPCR_HEIC | LPCR_LPES0 | LPCR_HVICE | \ 
+    LPCR_HDICE
+/* DD2 adds an extra HAIL bit */
+#define POWERPC_POWER10_PCC_LPCR_MASK \
+    POWERPC_POWER9_PCC_LPCR_MASK | LPCR_HAIL
+#define POWERPC_POWER9_PCC_FLAGS_COMMON                                 \

POWERPC_FLAG_POWER9


+    POWERPC_FLAG_VRE | POWERPC_FLAG_SE | POWERPC_FLAG_BE |              \
+    POWERPC_FLAG_PMM | POWERPC_FLAG_BUS_CLK | POWERPC_FLAG_CFAR |       \
+    POWERPC_FLAG_VSX | POWERPC_FLAG_SCV
+
+#define POWERPC_POWER9_PCC_FLAGS  \
+    POWERPC_POWER9_PCC_FLAGS_COMMON | POWERPC_FLAG_TM
+#define POWERPC_POWER10_PCC_FLAGS \
+    POWERPC_POWER9_PCC_FLAGS_COMMON | POWERPC_FLAG_BHRB
+
+#endif /* TARGET_PPC_CPU_INIT_H */
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