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plugins: implement helpers for resolving hwaddr

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We need to keep a local per-cpu copy of the data as other threads may
be running. Currently we can provide insight as to if the access was
IO or not and give the offset into a given device (usually the main
RAMBlock). We store enough information to get details such as the
MemoryRegion which might be useful in later expansions to the API.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2019-06-19 20:20:08 +01:00
parent e6d86bed50
commit 235537fa73
4 changed files with 139 additions and 0 deletions
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42
accel/tcg/cputlb.c
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@ -34,6 +34,9 @@
#include "qemu/atomic.h"
#include "qemu/atomic128.h"
#include "translate-all.h"
#ifdef CONFIG_PLUGIN
#include "qemu/plugin-memory.h"
#endif
/* DEBUG defines, enable DEBUG_TLB_LOG to log to the CPU_LOG_MMU target */
/* #define DEBUG_TLB */
@ -1247,6 +1250,45 @@ void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr,
return (void *)((uintptr_t)addr + entry->addend);
}
#ifdef CONFIG_PLUGIN
/*
* Perform a TLB lookup and populate the qemu_plugin_hwaddr structure.
* This should be a hot path as we will have just looked this path up
* in the softmmu lookup code (or helper). We don't handle re-fills or
* checking the victim table. This is purely informational.
*
* This should never fail as the memory access being instrumented
* should have just filled the TLB.
*/
bool tlb_plugin_lookup(CPUState *cpu, target_ulong addr, int mmu_idx,
bool is_store, struct qemu_plugin_hwaddr *data)
{
CPUArchState *env = cpu->env_ptr;
CPUTLBEntry *tlbe = tlb_entry(env, mmu_idx, addr);
uintptr_t index = tlb_index(env, mmu_idx, addr);
target_ulong tlb_addr = is_store ? tlb_addr_write(tlbe) : tlbe->addr_read;
if (likely(tlb_hit(tlb_addr, addr))) {
/* We must have an iotlb entry for MMIO */
if (tlb_addr & TLB_MMIO) {
CPUIOTLBEntry *iotlbentry;
iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
data->is_io = true;
data->v.io.section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
data->v.io.offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
} else {
data->is_io = false;
data->v.ram.hostaddr = addr + tlbe->addend;
}
return true;
}
return false;
}
#endif
/* Probe for a read-modify-write atomic operation. Do not allow unaligned
* operations, or io operations to proceed. Return the host address. */
static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,