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Re: [PATCH] memory: Replace DEBUG_UNASSIGNED printf calls by trace event
From: |
Paolo Bonzini |
Subject: |
Re: [PATCH] memory: Replace DEBUG_UNASSIGNED printf calls by trace events |
Date: |
Fri, 20 Sep 2019 16:17:39 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 |
On 20/09/19 16:12, Philippe Mathieu-Daudé wrote:
> Now that the unassigned_access CPU hooks have been removed,
> the unassigned_mem_read/write functions are only used for
> debugging purpose.
> Simplify by converting them to in-place trace events.
>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
> ---
> Based-on: <address@hidden>
> https://lists.gnu.org/archive/html/qemu-devel/2019-09/msg04668.html
> https://lists.gnu.org/archive/html/qemu-devel/2019-09/msg03705.html
>
> I first wrote:
>
> These functions are declared using the CPUReadMemoryFunc/
> CPUWriteMemoryFunc prototypes. Since it is confusing to
> have such prototype only use for debugging, convert them
> to in-place trace events.
>
> But it doesn't provide helpful information and is rather confusing.
>
> Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
Acked-by: Paolo Bonzini <address@hidden>
I think it's simplest if all series (RISC-V, remove unassigned_access,
this one) go through the RISC-V tree.
Paolo
> ---
> memory.c | 24 +++---------------------
> trace-events | 2 ++
> 2 files changed, 5 insertions(+), 21 deletions(-)
>
> diff --git a/memory.c b/memory.c
> index 93a05395cf..07e80a637a 100644
> --- a/memory.c
> +++ b/memory.c
> @@ -35,8 +35,6 @@
> #include "hw/boards.h"
> #include "migration/vmstate.h"
>
> -//#define DEBUG_UNASSIGNED
> -
> static unsigned memory_region_transaction_depth;
> static bool memory_region_update_pending;
> static bool ioeventfd_update_pending;
> @@ -1272,23 +1270,6 @@ static void iommu_memory_region_initfn(Object *obj)
> mr->is_iommu = true;
> }
>
> -static uint64_t unassigned_mem_read(void *opaque, hwaddr addr,
> - unsigned size)
> -{
> -#ifdef DEBUG_UNASSIGNED
> - printf("Unassigned mem read " TARGET_FMT_plx "\n", addr);
> -#endif
> - return 0;
> -}
> -
> -static void unassigned_mem_write(void *opaque, hwaddr addr,
> - uint64_t val, unsigned size)
> -{
> -#ifdef DEBUG_UNASSIGNED
> - printf("Unassigned mem write " TARGET_FMT_plx " = 0x%"PRIx64"\n", addr,
> val);
> -#endif
> -}
> -
> static bool unassigned_mem_accepts(void *opaque, hwaddr addr,
> unsigned size, bool is_write,
> MemTxAttrs attrs)
> @@ -1437,7 +1418,8 @@ MemTxResult memory_region_dispatch_read(MemoryRegion
> *mr,
> MemTxResult r;
>
> if (!memory_region_access_valid(mr, addr, size, false, attrs)) {
> - *pval = unassigned_mem_read(mr, addr, size);
> + trace_memory_region_invalid_read(size, addr);
> + *pval = 0; /* FIXME now this value shouldn't be accessed in guest */
> return MEMTX_DECODE_ERROR;
> }
>
> @@ -1481,7 +1463,7 @@ MemTxResult memory_region_dispatch_write(MemoryRegion
> *mr,
> unsigned size = memop_size(op);
>
> if (!memory_region_access_valid(mr, addr, size, true, attrs)) {
> - unassigned_mem_write(mr, addr, data, size);
> + trace_memory_region_invalid_write(size, addr, size << 1, data);
> return MEMTX_DECODE_ERROR;
> }
>
> diff --git a/trace-events b/trace-events
> index 823a4ae64e..83dbeb4b46 100644
> --- a/trace-events
> +++ b/trace-events
> @@ -62,6 +62,8 @@ memory_region_tb_read(int cpu_index, uint64_t addr,
> uint64_t value, unsigned siz
> memory_region_tb_write(int cpu_index, uint64_t addr, uint64_t value,
> unsigned size) "cpu %d addr 0x%"PRIx64" value 0x%"PRIx64" size %u"
> memory_region_ram_device_read(int cpu_index, void *mr, uint64_t addr,
> uint64_t value, unsigned size) "cpu %d mr %p addr 0x%"PRIx64" value
> 0x%"PRIx64" size %u"
> memory_region_ram_device_write(int cpu_index, void *mr, uint64_t addr,
> uint64_t value, unsigned size) "cpu %d mr %p addr 0x%"PRIx64" value
> 0x%"PRIx64" size %u"
> +memory_region_invalid_read(unsigned size, uint64_t addr) "invalid read size
> %u addr 0x%"PRIx64
> +memory_region_invalid_write(unsigned size, uint64_t addr, int fmt_width,
> uint64_t value) "invalid write size %u addr 0x%"PRIx64" value 0x%0*"PRIx64
> flatview_new(void *view, void *root) "%p (root %p)"
> flatview_destroy(void *view, void *root) "%p (root %p)"
> flatview_destroy_rcu(void *view, void *root) "%p (root %p)"
>