Re: [Xen-devel] [PATCH] hw/piix4acpi: Make writes to ACPI_DBG_IO_ADDR actually work.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Nov 11, 2013 at 02:24:43PM -0500, Ross Philipson wrote:
> On 11/11/2013 01:42 PM, Konrad Rzeszutek Wilk wrote:
> >The ACPI AML code has little snippets where it uses two
> >memory locations to stash debug information when doing PCI
> >hotplug, such as:
> >
> >Device (S20)
> >{
> >     Name (_ADR, 0x00040000)
> >     Name (_SUN, 0x04)
> >     Method (_EJ0, 1, NotSerialized)
> >     {
> >     Store (0x20, \_GPE.DPT1)
> >     Store (0x88, \_GPE.DPT2)
> >     Store (One, \_GPE.PH20)
> >     }
> >
> >     Method (_STA, 0, NotSerialized)
> >     {
> >     Store (0x20, \_GPE.DPT1)
> >     Store (0x89, \_GPE.DPT2)
> >     }
> >}
> >
> >and DPT1 (and DPT2) is defined as:
> >
> >OperationRegion ( DG1, SystemIO, 0xb044, 0x04 )
> >Field ( DG1, ByteAcc, NoLock, Preserve ) {
> >     DPT1, 8, DPT2, 8
> >}
> 
> Just as a note for the sake of correctness, that Field only defines
> 2 bytes but the OpRegion is defined as 4 bytes (and doesn't need to
> be).

Yup, I saw that too and was wondering why it was defined that way.

It probably can use some more fixes :-)
> 
> >
> >But unfortunately when we do the writes they are done
> >as byte writes, not as 4-byte writes (long). Hence
> >any debug values are never show in QEMU.
> >
> >This fixes it so that we can see them in the log file.
> >
> >CC: ian.jackson@xxxxxxxxxxxxx
> >Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> >---
> >  hw/piix4acpi.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> >
> >diff --git a/hw/piix4acpi.c b/hw/piix4acpi.c
> >index bf916d9..ddbe8e0 100644
> >--- a/hw/piix4acpi.c
> >+++ b/hw/piix4acpi.c
> >@@ -284,7 +284,7 @@ static inline void clear_bit(uint8_t *map, int bit)
> >      map[bit / 8] &= ~(1 << (bit % 8));
> >  }
> >
> >-static void acpi_dbg_writel(void *opaque, uint32_t addr, uint32_t val)
> >+static void acpi_dbg_writeb(void *opaque, uint32_t addr, uint32_t val)
> >  {
> >      PIIX4ACPI_LOG(PIIX4ACPI_LOG_DEBUG, "ACPI: DBG: 0x%08x\n", val);
> >      PIIX4ACPI_LOG(PIIX4ACPI_LOG_INFO, "ACPI:debug: write addr=0x%x, 
> > val=0x%x.\n", addr, val);
> >@@ -776,7 +776,7 @@ i2c_bus *piix4_pm_init(PCIBus *bus, int devfn, uint32_t 
> >smb_io_base,
> >  #ifdef CONFIG_PASSTHROUGH
> >      php_devfn_init();
> >  #endif
> >-    register_ioport_write(ACPI_DBG_IO_ADDR, 4, 4, acpi_dbg_writel, d);
> >+    register_ioport_write(ACPI_DBG_IO_ADDR, 4, 1, acpi_dbg_writeb, d);
> >
> >      register_savevm("piix4acpi", 0, 2, piix4acpi_save, piix4acpi_load, d);
> >
> >
> 
> 
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