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Re: [Qemu-devel] [PATCH v2 5/9] IDE: replace DEBUG_AIO with trace events


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-devel] [PATCH v2 5/9] IDE: replace DEBUG_AIO with trace events
Date: Wed, 30 Aug 2017 00:14:47 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0

Hi John,

On 08/29/2017 05:49 PM, John Snow wrote:
Signed-off-by: John Snow <address@hidden>
---
  hw/ide/atapi.c            |  5 +----
  hw/ide/core.c             | 17 ++++++++++-------
  hw/ide/trace-events       |  3 +++
  include/hw/ide/internal.h |  6 ++++--
  4 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index 37fa699..b8fc51e 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -416,10 +416,7 @@ static void ide_atapi_cmd_read_dma_cb(void *opaque, int 
ret)
          s->io_buffer_size = n * 2048;
          data_offset = 0;
      }
-#ifdef DEBUG_AIO
-    printf("aio_read_cd: lba=%u n=%d\n", s->lba, n);
-#endif
-
+    trace_ide_atapi_cmd_read_dma_cb_aio(s, s->lba, n);
      s->bus->dma->iov.iov_base = (void *)(s->io_buffer + data_offset);
      s->bus->dma->iov.iov_len = n * ATAPI_SECTOR_SIZE;
      qemu_iovec_init_external(&s->bus->dma->qiov, &s->bus->dma->iov, 1);
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 82a19b1..a1c90e9 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -58,6 +58,13 @@ static const int smart_attributes[][12] = {
      { 190,  0x03, 0x00, 0x45, 0x45, 0x1f, 0x00, 0x1f, 0x1f, 0x00, 0x00, 0x32},
  };
+const char *IDE_DMA_CMD_lookup[IDE_DMA__COUNT] = {
+    [IDE_DMA_READ] = "DMA READ",
+    [IDE_DMA_WRITE] = "DMA WRITE",
+    [IDE_DMA_TRIM] = "DMA TRIM",
+    [IDE_DMA_ATAPI] = "DMA ATAPI"
+};
+
  static void ide_dummy_transfer_stop(IDEState *s);
static void padstr(char *str, const char *src, int len)
@@ -860,10 +867,8 @@ static void ide_dma_cb(void *opaque, int ret)
          goto eot;
      }
-#ifdef DEBUG_AIO
-    printf("ide_dma_cb: sector_num=%" PRId64 " n=%d, cmd_cmd=%d\n",
-           sector_num, n, s->dma_cmd);
-#endif
+    trace_ide_dma_cb(s, sector_num, n,
+                     IDE_DMA_CMD_lookup[s->dma_cmd]);
if ((s->dma_cmd == IDE_DMA_READ || s->dma_cmd == IDE_DMA_WRITE) &&
          !ide_sect_range_ok(s, sector_num, n)) {
@@ -2391,9 +2396,7 @@ void ide_bus_reset(IDEBus *bus)
/* pending async DMA */
      if (bus->dma->aiocb) {
-#ifdef DEBUG_AIO
-        printf("aio_cancel\n");
-#endif
+        trace_ide_bus_reset_aio();
          blk_aio_cancel(bus->dma->aiocb);
          bus->dma->aiocb = NULL;
      }
diff --git a/hw/ide/trace-events b/hw/ide/trace-events
index 8c79a6c..cc8949c 100644
--- a/hw/ide/trace-events
+++ b/hw/ide/trace-events
@@ -18,6 +18,8 @@ ide_cancel_dma_sync_remaining(void) "draining all remaining 
requests"
  ide_sector_read(int64_t sector_num, int nsectors) "sector=%"PRId64" 
nsectors=%d"
  ide_sector_write(int64_t sector_num, int nsectors) "sector=%"PRId64" 
nsectors=%d"
  ide_reset(void *s) "IDEstate %p"
+ide_bus_reset_aio(void) "aio_cancel"
+ide_dma_cb(void *s, int64_t sector_num, int n, const char *dma) "IDEState %p; 
sector_num=%"PRId64" n=%d cmd=%s"
# BMDMA HBAs: @@ -51,5 +53,6 @@ ide_atapi_cmd_reply_end_new(void *s, int status) "IDEState: %p; new transfer sta
  ide_atapi_cmd_check_status(void *s) "IDEState: %p"
  ide_atapi_cmd_read(void *s, const char *method, int lba, int nb_sectors) 
"IDEState: %p; read %s: LBA=%d nb_sectors=%d"
  ide_atapi_cmd(void *s, uint8_t cmd) "IDEState: %p; cmd: 0x%02x"
+ide_atapi_cmd_read_dma_cb_aio(void *s, int lba, int n) "IDEState: %p; aio read: 
lba=%d n=%d"
  # Warning: Verbose
  ide_atapi_cmd_packet(void *s, uint16_t limit, const char *packet) "IDEState: %p; 
limit=0x%x packet: %s"
diff --git a/include/hw/ide/internal.h b/include/hw/ide/internal.h
index 74efe8a..db9fde0 100644
--- a/include/hw/ide/internal.h
+++ b/include/hw/ide/internal.h
@@ -14,7 +14,6 @@
  #include "block/scsi.h"
/* debug IDE devices */
-//#define DEBUG_AIO
  #define USE_DMA_CDROM
typedef struct IDEBus IDEBus;
@@ -333,12 +332,15 @@ struct unreported_events {
  };
enum ide_dma_cmd {
-    IDE_DMA_READ,
+    IDE_DMA_READ = 0,
      IDE_DMA_WRITE,
      IDE_DMA_TRIM,
      IDE_DMA_ATAPI,
+    IDE_DMA__COUNT
  };
+extern const char *IDE_DMA_CMD_lookup[IDE_DMA__COUNT];

I recommend you to avoid this declaring extern const array with size, I remember some compilers (old GCC?) ignoring array size in extern. Eric will correct me!

It is much safer to use a getter:

const char *IDE_DMA_CMD_lookup(enum ide_dma_cmd cmd)
{
    static const char *IDE_DMA_CMD_name[IDE_DMA__COUNT] = {
        [IDE_DMA_READ] = "DMA READ",
        [IDE_DMA_WRITE] = "DMA WRITE",
        [IDE_DMA_TRIM] = "DMA TRIM",
        [IDE_DMA_ATAPI] = "DMA ATAPI"
    };

    return IDE_DMA_CMD_name[cmd];
};

If you agree:
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

+
  #define ide_cmd_is_read(s) \
        ((s)->dma_cmd == IDE_DMA_READ)



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