Re: [Qemu-devel] [PATCH 13/14] qtest/ahci: Bookmark FB and CLB pointers

[Paolo Bonzini <pbonzini@redhat.com>]

On 13/01/2015 04:34, John Snow wrote:
> Instead of re-querying the AHCI device for the FB and CLB buffers, save
> the pointer we gave to the device during initialization and reference
> these values instead.
> 
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  tests/ahci-test.c   | 42 ++++++++++++++++++++----------------------
>  tests/libqos/ahci.h |  6 ++++++
>  2 files changed, 26 insertions(+), 22 deletions(-)
> 
> diff --git a/tests/ahci-test.c b/tests/ahci-test.c
> index 0bf572e..4a723c0 100644
> --- a/tests/ahci-test.c
> +++ b/tests/ahci-test.c
> @@ -206,7 +206,7 @@ static void ahci_hba_enable(AHCIQState *ahci)
>       * PxCMD.FR   "FIS Receive Running"
>       * PxCMD.CR   "Command List Running"
>       */
> -    uint32_t reg, ports_impl, clb, fb;
> +    uint32_t reg, ports_impl;
>      uint16_t i;
>      uint8_t num_cmd_slots;
>  
> @@ -255,16 +255,20 @@ static void ahci_hba_enable(AHCIQState *ahci)
>  
>          /* Allocate Memory for the Command List Buffer & FIS Buffer */
>          /* PxCLB space ... 0x20 per command, as in 4.2.2 p 36 */
> -        clb = ahci_alloc(ahci, num_cmd_slots * 0x20);
> -        g_test_message("CLB: 0x%08x", clb);
> -        ahci_px_wreg(ahci, i, AHCI_PX_CLB, clb);
> -        g_assert_cmphex(clb, ==, ahci_px_rreg(ahci, i, AHCI_PX_CLB));
> +        ahci->port[i].clb = ahci_alloc(ahci, num_cmd_slots * 0x20);
> +        qmemset(ahci->port[i].clb, 0x00, 0x100);
> +        g_test_message("CLB: 0x%08lx", ahci->port[i].clb);
> +        ahci_px_wreg(ahci, i, AHCI_PX_CLB, ahci->port[i].clb);
> +        g_assert_cmphex(ahci->port[i].clb, ==,
> +                        ahci_px_rreg(ahci, i, AHCI_PX_CLB));
>  
>          /* PxFB space ... 0x100, as in 4.2.1 p 35 */
> -        fb = ahci_alloc(ahci, 0x100);
> -        g_test_message("FB: 0x%08x", fb);
> -        ahci_px_wreg(ahci, i, AHCI_PX_FB, fb);
> -        g_assert_cmphex(fb, ==, ahci_px_rreg(ahci, i, AHCI_PX_FB));
> +        ahci->port[i].fb = ahci_alloc(ahci, 0x100);
> +        qmemset(ahci->port[i].fb, 0x00, 0x100);
> +        g_test_message("FB: 0x%08lx", ahci->port[i].fb);
> +        ahci_px_wreg(ahci, i, AHCI_PX_FB, ahci->port[i].fb);
> +        g_assert_cmphex(ahci->port[i].fb, ==,
> +                        ahci_px_rreg(ahci, i, AHCI_PX_FB));
>  
>          /* Clear PxSERR, PxIS, then IS.IPS[x] by writing '1's. */
>          ahci_px_wreg(ahci, i, AHCI_PX_SERR, 0xFFFFFFFF);
> @@ -883,7 +887,7 @@ static void ahci_test_identify(AHCIQState *ahci)
>      RegH2DFIS fis;
>      AHCICommand cmd;
>      PRD prd;
> -    uint32_t ports, reg, clb, table, fb, data_ptr;
> +    uint32_t ports, reg, table, data_ptr;
>      uint16_t buff[256];
>      unsigned i;
>      int rc;
> @@ -929,9 +933,7 @@ static void ahci_test_identify(AHCIQState *ahci)
>      g_assert_cmphex(ahci_px_rreg(ahci, i, AHCI_PX_IS), ==, 0);
>  
>      /* Wipe the FIS-Recieve Buffer */
> -    fb = ahci_px_rreg(ahci, i, AHCI_PX_FB);
> -    g_assert_cmphex(fb, !=, 0);
> -    qmemset(fb, 0x00, 0x100);
> +    qmemset(ahci->port[i].fb, 0x00, 0x100);
>  
>      /* Create a Command Table buffer. 0x80 is the smallest with a PRDTL of 0. */
>      /* We need at least one PRD, so round up to the nearest 0x80 multiple.    */
> @@ -943,13 +945,9 @@ static void ahci_test_identify(AHCIQState *ahci)
>      data_ptr = ahci_alloc(ahci, 512);
>      g_assert(data_ptr);
>  
> -    /* Grab the Command List Buffer pointer */
> -    clb = ahci_px_rreg(ahci, i, AHCI_PX_CLB);
> -    g_assert(clb);
> -
>      /* Copy the existing Command #0 structure from the CLB into local memory,
>       * and build a new command #0. */
> -    memread(clb, &cmd, sizeof(cmd));
> +    memread(ahci->port[i].clb, &cmd, sizeof(cmd));
>      cmd.b1 = 5;    /* reg_h2d_fis is 5 double-words long */
>      cmd.b2 = 0x04; /* clear PxTFD.STS.BSY when done */
>      cmd.prdtl = cpu_to_le16(1); /* One PRD table entry. */
> @@ -981,7 +979,7 @@ static void ahci_test_identify(AHCIQState *ahci)
>      memwrite(table + 0x80, &prd, sizeof(prd));
>  
>      /* Commit Command #0, pointing to the Table, to the Command List Buffer. */
> -    memwrite(clb, &cmd, sizeof(cmd));
> +    memwrite(ahci->port[i].clb, &cmd, sizeof(cmd));
>  
>      /* Everything is in place, but we haven't given the go-ahead yet. */
>      g_assert_cmphex(ahci_px_rreg(ahci, i, AHCI_PX_IS), ==, 0);
> @@ -1012,12 +1010,12 @@ static void ahci_test_identify(AHCIQState *ahci)
>      ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_ERR);
>  
>      /* Investigate CMD #0, assert that we read 512 bytes */
> -    memread(clb, &cmd, sizeof(cmd));
> +    memread(ahci->port[i].clb, &cmd, sizeof(cmd));
>      g_assert_cmphex(512, ==, le32_to_cpu(cmd.prdbc));
>  
>      /* Investigate FIS responses */
> -    memread(fb + 0x20, pio, 0x20);
> -    memread(fb + 0x40, d2h, 0x20);
> +    memread(ahci->port[i].fb + 0x20, pio, 0x20);
> +    memread(ahci->port[i].fb + 0x40, d2h, 0x20);
>      g_assert_cmphex(pio->fis_type, ==, 0x5f);
>      g_assert_cmphex(d2h->fis_type, ==, 0x34);
>      g_assert_cmphex(pio->flags, ==, d2h->flags);
> diff --git a/tests/libqos/ahci.h b/tests/libqos/ahci.h
> index 56b1dfc..f4fc52b 100644
> --- a/tests/libqos/ahci.h
> +++ b/tests/libqos/ahci.h
> @@ -245,6 +245,11 @@
>  
>  /*** Structures ***/
>  
> +typedef struct AHCIPortQState {
> +    uint64_t fb;
> +    uint64_t clb;
> +} AHCIPortQState;
> +
>  typedef struct AHCIQState {
>      QOSState *parent;
>      QPCIDevice *dev;
> @@ -253,6 +258,7 @@ typedef struct AHCIQState {
>      uint32_t fingerprint;
>      uint32_t cap;
>      uint32_t cap2;
> +    AHCIPortQState port[32];
>  } AHCIQState;
>  
>  /**
> 

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>