From bbdd34d62863d2cc870568890dac0eb0f8be358c Mon Sep 17 00:00:00 2001 From: Curtis Dunham Date: Fri, 27 Jan 2017 20:16:23 +0000 Subject: arm: refactor packet processing in Pl390 GIC Change-Id: I696703418506522ba90df5c2c4ca45c95a6efbea Reviewed-by: Andreas Sandberg Reviewed-on: https://gem5-review.googlesource.com/2441 Maintainer: Andreas Sandberg Reviewed-by: Weiping Liao --- src/dev/arm/gic_pl390.cc | 250 +++++++++++++++++++++++++---------------------- src/dev/arm/gic_pl390.hh | 5 + 2 files changed, 138 insertions(+), 117 deletions(-) (limited to 'src') diff --git a/src/dev/arm/gic_pl390.cc b/src/dev/arm/gic_pl390.cc index 22788b375..b65014d23 100644 --- a/src/dev/arm/gic_pl390.cc +++ b/src/dev/arm/gic_pl390.cc @@ -129,46 +129,64 @@ Pl390::readDistributor(PacketPtr pkt) DPRINTF(GIC, "gic distributor read register %#x\n", daddr); + const uint32_t resp = readDistributor(ctx, daddr, pkt->getSize()); + + switch (pkt->getSize()) { + case 1: + pkt->set(resp); + break; + case 2: + pkt->set(resp); + break; + case 4: + pkt->set(resp); + break; + default: + panic("Invalid size while reading Distributor regs in GIC: %d\n", + pkt->getSize()); + } + + pkt->makeAtomicResponse(); + return distPioDelay; +} + +uint32_t +Pl390::readDistributor(ContextID ctx, Addr daddr, size_t resp_sz) +{ if (GICD_ISENABLER.contains(daddr)) { uint32_t ix = (daddr - GICD_ISENABLER.start()) >> 2; assert(ix < 32); - pkt->set(getIntEnabled(ctx, ix)); - goto done; + return getIntEnabled(ctx, ix); } if (GICD_ICENABLER.contains(daddr)) { uint32_t ix = (daddr - GICD_ICENABLER.start()) >> 2; assert(ix < 32); - pkt->set(getIntEnabled(ctx, ix)); - goto done; + return getIntEnabled(ctx, ix); } if (GICD_ISPENDR.contains(daddr)) { uint32_t ix = (daddr - GICD_ISPENDR.start()) >> 2; assert(ix < 32); - pkt->set(getPendingInt(ctx, ix)); - goto done; + return getPendingInt(ctx, ix); } if (GICD_ICPENDR.contains(daddr)) { uint32_t ix = (daddr - GICD_ICPENDR.start()) >> 2; assert(ix < 32); - pkt->set(getPendingInt(ctx, ix)); - goto done; + return getPendingInt(ctx, ix); } if (GICD_ISACTIVER.contains(daddr)) { uint32_t ix = (daddr - GICD_ISACTIVER.start()) >> 2; assert(ix < 32); - pkt->set(getActiveInt(ctx, ix)); - goto done; + return getActiveInt(ctx, ix); } if (GICD_ICACTIVER.contains(daddr)) { uint32_t ix = (daddr - GICD_ICACTIVER.start()) >> 2; assert(ix < 32); - pkt->set(getActiveInt(ctx, ix)); - goto done; + return getActiveInt(ctx, ix); } if (GICD_IPRIORITYR.contains(daddr)) { @@ -176,27 +194,21 @@ Pl390::readDistributor(PacketPtr pkt) assert(int_num < INT_LINES_MAX); DPRINTF(Interrupt, "Reading interrupt priority at int# %#x \n",int_num); - switch (pkt->getSize()) { + switch (resp_sz) { + default: // will panic() after return to caller anyway case 1: - pkt->set(getIntPriority(ctx, int_num)); - break; + return getIntPriority(ctx, int_num); case 2: assert((int_num + 1) < INT_LINES_MAX); - pkt->set(getIntPriority(ctx, int_num) | - getIntPriority(ctx, int_num+1) << 8); - break; + return (getIntPriority(ctx, int_num) | + getIntPriority(ctx, int_num+1) << 8); case 4: assert((int_num + 3) < INT_LINES_MAX); - pkt->set(getIntPriority(ctx, int_num) | - getIntPriority(ctx, int_num+1) << 8 | - getIntPriority(ctx, int_num+2) << 16 | - getIntPriority(ctx, int_num+3) << 24); - break; - default: - panic("Invalid size while reading priority regs in GIC: %d\n", - pkt->getSize()); + return (getIntPriority(ctx, int_num) | + getIntPriority(ctx, int_num+1) << 8 | + getIntPriority(ctx, int_num+2) << 16 | + getIntPriority(ctx, int_num+3) << 24); } - goto done; } if (GICD_ITARGETSR.contains(daddr)) { @@ -207,15 +219,15 @@ Pl390::readDistributor(PacketPtr pkt) // First 31 interrupts only target single processor (SGI) if (int_num > 31) { - if (pkt->getSize() == 1) { - pkt->set(cpuTarget[int_num]); + if (resp_sz == 1) { + return cpuTarget[int_num]; } else { - assert(pkt->getSize() == 4); + assert(resp_sz == 4); int_num = mbits(int_num, 31, 2); - pkt->set(cpuTarget[int_num] | - cpuTarget[int_num+1] << 8 | - cpuTarget[int_num+2] << 16 | - cpuTarget[int_num+3] << 24) ; + return (cpuTarget[int_num] | + cpuTarget[int_num+1] << 8 | + cpuTarget[int_num+2] << 16 | + cpuTarget[int_num+3] << 24) ; } } else { assert(ctx < sys->numRunningContexts()); @@ -229,9 +241,8 @@ Pl390::readDistributor(PacketPtr pkt) // replicate the 8-bit mask 4 times in a 32-bit word ctx_mask |= ctx_mask << 8; ctx_mask |= ctx_mask << 16; - pkt->set(ctx_mask); + return ctx_mask; } - goto done; } if (GICD_ICFGR.contains(daddr)) { @@ -239,30 +250,23 @@ Pl390::readDistributor(PacketPtr pkt) assert(ix < 64); /** @todo software generated interrupts and PPIs * can't be configured in some ways */ - pkt->set(intConfig[ix]); - goto done; + return intConfig[ix]; } switch(daddr) { case GICD_CTLR: - pkt->set(enabled); - break; - case GICD_TYPER: { + return enabled; + case GICD_TYPER: /* The 0x100 is a made-up flag to show that gem5 extensions * are available, * write 0x200 to this register to enable it. */ - uint32_t tmp = ((sys->numRunningContexts() - 1) << 5) | - (itLines/INT_BITS_MAX -1) | - (haveGem5Extensions ? 0x100 : 0x0); - pkt->set(tmp); - } break; + return (((sys->numRunningContexts() - 1) << 5) | + (itLines/INT_BITS_MAX -1) | + (haveGem5Extensions ? 0x100 : 0x0)); default: panic("Tried to read Gic distributor at offset %#x\n", daddr); break; } -done: - pkt->makeAtomicResponse(); - return distPioDelay; } Tick @@ -277,19 +281,24 @@ Pl390::readCpu(PacketPtr pkt) DPRINTF(GIC, "gic cpu read register %#x cpu context: %d\n", daddr, ctx); + pkt->set(readCpu(ctx, daddr)); + + pkt->makeAtomicResponse(); + return cpuPioDelay; +} + +uint32_t +Pl390::readCpu(ContextID ctx, Addr daddr) +{ switch(daddr) { case GICC_IIDR: - pkt->set(0); - break; + return 0; case GICC_CTLR: - pkt->set(cpuEnabled[ctx]); - break; + return cpuEnabled[ctx]; case GICC_PMR: - pkt->set(cpuPriority[ctx]); - break; + return cpuPriority[ctx]; case GICC_BPR: - pkt->set(cpuBpr[ctx]); - break; + return cpuBpr[ctx]; case GICC_IAR: if (enabled && cpuEnabled[ctx]) { int active_int = cpuHighestInt[ctx]; @@ -337,26 +346,22 @@ Pl390::readCpu(PacketPtr pkt) ctx, iar.ack_id, iar.cpu_id, iar); cpuHighestInt[ctx] = SPURIOUS_INT; updateIntState(-1); - pkt->set(iar); platform->intrctrl->clear(ctx, ArmISA::INT_IRQ, 0); + return iar; } else { - pkt->set(SPURIOUS_INT); + return SPURIOUS_INT; } break; case GICC_RPR: - pkt->set(iccrpr[0]); - break; + return iccrpr[0]; case GICC_HPPIR: - pkt->set(0); panic("Need to implement HPIR"); break; default: panic("Tried to read Gic cpu at offset %#x\n", daddr); break; } - pkt->makeAtomicResponse(); - return cpuPioDelay; } Tick @@ -366,9 +371,10 @@ Pl390::writeDistributor(PacketPtr pkt) assert(pkt->req->hasContextId()); const ContextID ctx = pkt->req->contextId(); + const size_t data_sz = pkt->getSize(); uint32_t pkt_data M5_VAR_USED; - switch (pkt->getSize()) + switch (data_sz) { case 1: pkt_data = pkt->get(); @@ -381,97 +387,104 @@ Pl390::writeDistributor(PacketPtr pkt) break; default: panic("Invalid size when writing to priority regs in Gic: %d\n", - pkt->getSize()); + data_sz); } DPRINTF(GIC, "gic distributor write register %#x size %#x value %#x \n", - daddr, pkt->getSize(), pkt_data); + daddr, data_sz, pkt_data); + + writeDistributor(ctx, daddr, pkt_data, data_sz); + pkt->makeAtomicResponse(); + return distPioDelay; +} + +void +Pl390::writeDistributor(ContextID ctx, Addr daddr, uint32_t data, + size_t data_sz) +{ if (GICD_ISENABLER.contains(daddr)) { uint32_t ix = (daddr - GICD_ISENABLER.start()) >> 2; assert(ix < 32); - getIntEnabled(ctx, ix) |= pkt->get(); - goto done; + getIntEnabled(ctx, ix) |= data; + return; } if (GICD_ICENABLER.contains(daddr)) { uint32_t ix = (daddr - GICD_ICENABLER.start()) >> 2; assert(ix < 32); - getIntEnabled(ctx, ix) &= ~pkt->get(); - goto done; + getIntEnabled(ctx, ix) &= ~data; + return; } if (GICD_ISPENDR.contains(daddr)) { uint32_t ix = (daddr - GICD_ISPENDR.start()) >> 2; - auto mask = pkt->get(); + auto mask = data; if (ix == 0) mask &= SGI_MASK; // Don't allow SGIs to be changed getPendingInt(ctx, ix) |= mask; updateIntState(ix); - goto done; + return; } if (GICD_ICPENDR.contains(daddr)) { uint32_t ix = (daddr - GICD_ICPENDR.start()) >> 2; - auto mask = pkt->get(); + auto mask = data; if (ix == 0) mask &= SGI_MASK; // Don't allow SGIs to be changed getPendingInt(ctx, ix) &= ~mask; updateIntState(ix); - goto done; + return; } if (GICD_ISACTIVER.contains(daddr)) { uint32_t ix = (daddr - GICD_ISACTIVER.start()) >> 2; - getActiveInt(ctx, ix) |= pkt->get(); - goto done; + getActiveInt(ctx, ix) |= data; + return; } if (GICD_ICACTIVER.contains(daddr)) { uint32_t ix = (daddr - GICD_ICACTIVER.start()) >> 2; - getActiveInt(ctx, ix) &= ~pkt->get(); - goto done; + getActiveInt(ctx, ix) &= ~data; + return; } if (GICD_IPRIORITYR.contains(daddr)) { Addr int_num = daddr - GICD_IPRIORITYR.start(); - switch(pkt->getSize()) { + switch(data_sz) { case 1: - getIntPriority(ctx, int_num) = pkt->get(); + getIntPriority(ctx, int_num) = data; break; case 2: { - auto tmp16 = pkt->get(); - getIntPriority(ctx, int_num) = bits(tmp16, 7, 0); - getIntPriority(ctx, int_num + 1) = bits(tmp16, 15, 8); + getIntPriority(ctx, int_num) = bits(data, 7, 0); + getIntPriority(ctx, int_num + 1) = bits(data, 15, 8); break; } case 4: { - auto tmp32 = pkt->get(); - getIntPriority(ctx, int_num) = bits(tmp32, 7, 0); - getIntPriority(ctx, int_num + 1) = bits(tmp32, 15, 8); - getIntPriority(ctx, int_num + 2) = bits(tmp32, 23, 16); - getIntPriority(ctx, int_num + 3) = bits(tmp32, 31, 24); + getIntPriority(ctx, int_num) = bits(data, 7, 0); + getIntPriority(ctx, int_num + 1) = bits(data, 15, 8); + getIntPriority(ctx, int_num + 2) = bits(data, 23, 16); + getIntPriority(ctx, int_num + 3) = bits(data, 31, 24); break; } default: panic("Invalid size when writing to priority regs in Gic: %d\n", - pkt->getSize()); + data_sz); } updateIntState(-1); updateRunPri(); - goto done; + return; } if (GICD_ITARGETSR.contains(daddr)) { Addr int_num = daddr - GICD_ITARGETSR.start(); // First 31 interrupts only target single processor if (int_num >= SGI_MAX) { - if (pkt->getSize() == 1) { - uint8_t tmp = pkt->get(); - cpuTarget[int_num] = tmp & 0xff; + if (data_sz == 1) { + cpuTarget[int_num] = data & 0xff; } else { - assert (pkt->getSize() == 4); + assert (data_sz == 4); int_num = mbits(int_num, 31, 2); - uint32_t tmp = pkt->get(); + uint32_t tmp = data; cpuTarget[int_num] = bits(tmp, 7, 0); cpuTarget[int_num+1] = bits(tmp, 15, 8); cpuTarget[int_num+2] = bits(tmp, 23, 16); @@ -479,43 +492,38 @@ Pl390::writeDistributor(PacketPtr pkt) } updateIntState(int_num >> 2); } - goto done; + return; } if (GICD_ICFGR.contains(daddr)) { uint32_t ix = (daddr - GICD_ICFGR.start()) >> 2; assert(ix < INT_BITS_MAX*2); - intConfig[ix] = pkt->get(); - if (pkt->get() & NN_CONFIG_MASK) + intConfig[ix] = data; + if (data & NN_CONFIG_MASK) warn("GIC N:N mode selected and not supported at this time\n"); - goto done; + return; } switch(daddr) { case GICD_CTLR: - enabled = pkt->get(); + enabled = data; DPRINTF(Interrupt, "Distributor enable flag set to = %d\n", enabled); break; case GICD_TYPER: /* 0x200 is a made-up flag to enable gem5 extension functionality. * This reg is not normally written. */ - gem5ExtensionsEnabled = ( - (pkt->get() & 0x200) && haveGem5Extensions); + gem5ExtensionsEnabled = (data & 0x200) && haveGem5Extensions; DPRINTF(GIC, "gem5 extensions %s\n", gem5ExtensionsEnabled ? "enabled" : "disabled"); break; case GICD_SGIR: - softInt(ctx, pkt->get()); + softInt(ctx, data); break; default: panic("Tried to write Gic distributor at offset %#x\n", daddr); break; } - -done: - pkt->makeAtomicResponse(); - return distPioDelay; } Tick @@ -525,23 +533,32 @@ Pl390::writeCpu(PacketPtr pkt) assert(pkt->req->hasContextId()); const ContextID ctx = pkt->req->contextId(); - IAR iar; + const uint32_t data = pkt->get(); DPRINTF(GIC, "gic cpu write register cpu:%d %#x val: %#x\n", - ctx, daddr, pkt->get()); + ctx, daddr, data); + writeCpu(ctx, daddr, data); + + pkt->makeAtomicResponse(); + return cpuPioDelay; +} + +void +Pl390::writeCpu(ContextID ctx, Addr daddr, uint32_t data) +{ switch(daddr) { case GICC_CTLR: - cpuEnabled[ctx] = pkt->get(); + cpuEnabled[ctx] = data; break; case GICC_PMR: - cpuPriority[ctx] = pkt->get(); + cpuPriority[ctx] = data; break; case GICC_BPR: - cpuBpr[ctx] = pkt->get(); + cpuBpr[ctx] = data; break; - case GICC_EOIR: - iar = pkt->get(); + case GICC_EOIR: { + const IAR iar = data; if (iar.ack_id < SGI_MAX) { // Clear out the bit that corresponds to the cleared int uint64_t clr_int = ULL(1) << (ctx + 8 * iar.cpu_id); @@ -569,13 +586,12 @@ Pl390::writeCpu(PacketPtr pkt) DPRINTF(Interrupt, "CPU %d done handling intr IAR = %d from cpu %d\n", ctx, iar.ack_id, iar.cpu_id); break; + } default: panic("Tried to write Gic cpu at offset %#x\n", daddr); break; } if (cpuEnabled[ctx]) updateIntState(-1); - pkt->makeAtomicResponse(); - return cpuPioDelay; } Pl390::BankedRegs& diff --git a/src/dev/arm/gic_pl390.hh b/src/dev/arm/gic_pl390.hh index 1a5248d92..aa3f3c084 100644 --- a/src/dev/arm/gic_pl390.hh +++ b/src/dev/arm/gic_pl390.hh @@ -393,21 +393,26 @@ class Pl390 : public BaseGic * @param pkt packet to respond to */ Tick readDistributor(PacketPtr pkt); + uint32_t readDistributor(ContextID ctx, Addr daddr, size_t resp_sz); /** Handle a read to the cpu portion of the GIC * @param pkt packet to respond to */ Tick readCpu(PacketPtr pkt); + uint32_t readCpu(ContextID ctx, Addr daddr); /** Handle a write to the distributor portion of the GIC * @param pkt packet to respond to */ Tick writeDistributor(PacketPtr pkt); + void writeDistributor(ContextID ctx, Addr daddr, uint32_t data, + size_t data_sz); /** Handle a write to the cpu portion of the GIC * @param pkt packet to respond to */ Tick writeCpu(PacketPtr pkt); + void writeCpu(ContextID ctx, Addr daddr, uint32_t data); }; #endif //__DEV_ARM_GIC_H__ -- cgit v1.2.3