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https://github.com/AsahiLinux/m1n1
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smp: add scaffolding and proxy funcs for cross-CPU calls
Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
parent
e97b104125
commit
c3c6e4e8f9
7 changed files with 92 additions and 9 deletions
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@ -303,6 +303,10 @@ class M1N1Proxy:
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P_XZDEC = 0x400
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P_GZDEC = 0x401
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P_SMP_START_SECONDARIES = 0x500
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P_SMP_CALL = 0x501
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P_SMP_CALL_SYNC = 0x502
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def __init__(self, iface, debug=False):
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self.debug = debug
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self.iface = iface
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@ -497,6 +501,19 @@ class M1N1Proxy:
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return self.request(self.P_GZDEC, inbuf, insize, outbuf,
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outsize, signed=True)
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def smp_start_secondaries(self):
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self.request(self.P_SMP_START_SECONDARIES)
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def smp_call(self, cpu, addr, *args):
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if len(args) > 4:
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raise ValueError("Too many arguments")
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self.request(self.P_SMP_CALL, cpu, addr, *args)
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def smp_call_sync(self, cpu, addr, *args):
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if len(args) > 4:
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raise ValueError("Too many arguments")
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return self.request(self.P_SMP_CALL_SYNC, cpu, addr, *args)
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if __name__ == "__main__":
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import serial
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uartdev = os.environ.get("M1N1DEVICE", "/dev/ttyUSB0")
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@ -7,8 +7,6 @@ extern char _vectors_start[0];
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void exception_initialize(void)
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{
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printf("Initializing exceptions...\n");
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msr(vbar_el2, _vectors_start);
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}
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14
src/proxy.c
14
src/proxy.c
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@ -1,6 +1,7 @@
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#include "proxy.h"
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#include "memory.h"
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#include "minilzlib/minlzma.h"
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#include "smp.h"
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#include "tinf/tinf.h"
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#include "types.h"
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#include "uart.h"
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@ -193,6 +194,19 @@ int proxy_process(ProxyRequest *request, ProxyReply *reply)
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break;
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}
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case P_SMP_START_SECONDARIES:
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smp_start_secondaries();
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break;
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case P_SMP_CALL:
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smp_call4(request->args[0], (void *)request->args[1], request->args[2],
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request->args[3], request->args[4], request->args[5]);
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break;
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case P_SMP_CALL_SYNC:
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smp_call4(request->args[0], (void *)request->args[1], request->args[2],
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request->args[3], request->args[4], request->args[5]);
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reply->retval = smp_wait(request->args[0]);
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break;
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default:
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reply->status = S_BADCMD;
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break;
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@ -54,9 +54,13 @@ typedef enum {
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P_DC_CVAU,
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P_DC_CIVAC,
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P_XZDEC = 0x400,
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P_XZDEC = 0x400, // Decompression and data processing ops
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P_GZDEC,
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P_SMP_START_SECONDARIES = 0x500, // SMP and system management ops
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P_SMP_CALL,
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P_SMP_CALL_SYNC,
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} ProxyOp;
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#define S_OK 0
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50
src/smp.c
50
src/smp.c
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@ -13,14 +13,16 @@
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struct spin_table {
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u64 flag;
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u64 target;
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u64 args[4];
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u64 retval;
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};
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void *_reset_stack;
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u8 secondary_stacks[MAX_CPUS][SECONDARY_STACK_SIZE] ALIGNED(64);
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static u8 secondary_stacks[MAX_CPUS][SECONDARY_STACK_SIZE] ALIGNED(64);
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int target_cpu;
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struct spin_table spin_table[MAX_CPUS];
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static int target_cpu;
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static struct spin_table spin_table[MAX_CPUS];
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extern u8 _vectors_start[0];
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@ -38,10 +40,13 @@ void smp_secondary_entry(void)
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sysop("wfe");
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}
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sysop("dmb sy");
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me->target = 0;
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me->flag++;
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sysop("dmb sy");
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((void (*)(void))target)();
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me->retval = ((u64(*)(u64 a, u64 b, u64 c, u64 d))target)(me->args[0], me->args[1],
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me->args[2], me->args[3]);
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sysop("dmb sy");
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me->target = 0;
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sysop("dmb sy");
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}
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}
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@ -49,9 +54,12 @@ static void smp_start_cpu(int index, int cluster, int core, u64 rvbar, u64 cpu_s
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{
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int i;
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if (spin_table[index].flag)
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return;
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printf("Starting CPU %d (%d:%d)... ", index, cluster, core);
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spin_table[index].flag = 0;
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memset(&spin_table[index], 0, sizeof(struct spin_table));
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target_cpu = index;
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_reset_stack = secondary_stacks[index] + SECONDARY_STACK_SIZE;
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@ -133,3 +141,33 @@ void smp_start_secondaries(void)
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smp_start_cpu(i, reg >> 8, reg & 0xff, cpu_impl_reg[0], pmgr_reg + CPU_START_OFF);
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}
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}
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void smp_call4(int cpu, void *func, u64 arg0, u64 arg1, u64 arg2, u64 arg3)
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{
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struct spin_table *target = &spin_table[cpu];
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if (cpu == 0)
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return;
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u64 flag = target->flag;
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target->args[0] = arg0;
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target->args[1] = arg1;
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target->args[2] = arg2;
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target->args[3] = arg3;
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sysop("dmb sy");
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target->target = (u64)func;
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sysop("dmb sy");
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sysop("sev");
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while (target->flag == flag)
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sysop("dmb sy");
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}
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u64 smp_wait(int cpu)
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{
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struct spin_table *target = &spin_table[cpu];
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while (target->target)
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sysop("dmb sy");
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return target->retval;
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}
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11
src/smp.h
11
src/smp.h
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@ -3,10 +3,21 @@
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#ifndef __SMP_H__
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#define __SMP_H__
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#include "types.h"
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#define MAX_CPUS 8
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void smp_secondary_entry(void);
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void smp_start_secondaries(void);
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#define smp_call0(i, f) smp_call(i, f, 0, 0, 0, 0)
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#define smp_call1(i, f, a) smp_call(i, f, a, 0, 0, 0)
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#define smp_call2(i, f, a, b) smp_call(i, f, a, b, 0, 0)
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#define smp_call3(i, f, a, b, c) smp_call(i, f, a, b, c, 0)
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void smp_call4(int cpu, void *func, u64 arg0, u64 arg1, u64 arg2, u64 arg3);
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u64 smp_wait(int cpu);
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#endif
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@ -98,5 +98,6 @@ void _cpu_reset_c(void *stack)
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const char *type = init_cpu();
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printf(" CPU: %s\n", type);
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exception_initialize();
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smp_secondary_entry();
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}
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