Re: [Qemu-devel] [PATCH 35/74] pc: acpi: factor out memhp code from build_ssdt() into separate function

[Igor Mammedov <imammedo@redhat.com>]

On Sat, 19 Dec 2015 22:18:14 +0200
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> On Thu, Dec 10, 2015 at 12:41:29AM +0100, Igor Mammedov wrote:
> > before consolidating memhp code in memory_hotplug_acpi_table.c
> > and for simplifying review, first factor out memhp code into
> > new function build_memory_devices() in i386/acpi-build.c
> > 
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ----
> > PS:
> >    no functional change, only code movement.
> > ---
> >  hw/i386/acpi-build.c | 239 +++++++++++++++++++++++++++------------------------
> >  1 file changed, 126 insertions(+), 113 deletions(-)
> > 
> > diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> > index 1b609e6..765fccd 100644
> > --- a/hw/i386/acpi-build.c
> > +++ b/hw/i386/acpi-build.c
> > @@ -903,6 +903,130 @@ static Aml *build_crs(PCIHostState *host,
> >      return crs;
> >  }
> >  
> > +static void build_memory_devices(Aml *sb_scope, int nr_mem,
> > +                                 uint16_t io_base, uint16_t io_len)
> > +{
> > +    int i;
> > +    Aml *scope;
> > +    Aml *crs;
> > +    Aml *field;
> > +    Aml *dev;
> > +    Aml *method;
> > +    Aml *ifctx;
> > +
> > +    /* build memory devices */
> > +    assert(nr_mem <= ACPI_MAX_RAM_SLOTS);
> > +    scope = aml_scope("\\_SB.PCI0." stringify(MEMORY_HOTPLUG_DEVICE));
> > +    aml_append(scope,
> > +        aml_name_decl(stringify(MEMORY_SLOTS_NUMBER), aml_int(nr_mem))
> > +    );
> > +
> > +    crs = aml_resource_template();
> > +    aml_append(crs,
> > +        aml_io(AML_DECODE16, io_base, io_base, 0, io_len)
> > +    );
> > +    aml_append(scope, aml_name_decl("_CRS", crs));
> > +
> > +    aml_append(scope, aml_operation_region(
> > +        stringify(MEMORY_HOTPLUG_IO_REGION), AML_SYSTEM_IO,
> > +        io_base, io_len)
> > +    );
> > +
> > +    field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_DWORD_ACC,
> > +                      AML_NOLOCK, AML_PRESERVE);
> > +    aml_append(field, /* read only */
> > +        aml_named_field(stringify(MEMORY_SLOT_ADDR_LOW), 32));
> > +    aml_append(field, /* read only */
> > +        aml_named_field(stringify(MEMORY_SLOT_ADDR_HIGH), 32));
> > +    aml_append(field, /* read only */
> > +        aml_named_field(stringify(MEMORY_SLOT_SIZE_LOW), 32));
> > +    aml_append(field, /* read only */
> > +        aml_named_field(stringify(MEMORY_SLOT_SIZE_HIGH), 32));
> > +    aml_append(field, /* read only */
> > +        aml_named_field(stringify(MEMORY_SLOT_PROXIMITY), 32));
> > +    aml_append(scope, field);
> > +
> > +    field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_BYTE_ACC,
> > +                      AML_NOLOCK, AML_WRITE_AS_ZEROS);
> > +    aml_append(field, aml_reserved_field(160 /* bits, Offset(20) */));
> > +    aml_append(field, /* 1 if enabled, read only */
> > +        aml_named_field(stringify(MEMORY_SLOT_ENABLED), 1));
> > +    aml_append(field,
> > +        /*(read) 1 if has a insert event. (write) 1 to clear event */
> > +        aml_named_field(stringify(MEMORY_SLOT_INSERT_EVENT), 1));
> > +    aml_append(field,
> > +        /* (read) 1 if has a remove event. (write) 1 to clear event */
> > +        aml_named_field(stringify(MEMORY_SLOT_REMOVE_EVENT), 1));
> > +    aml_append(field,
> > +        /* initiates device eject, write only */
> > +        aml_named_field(stringify(MEMORY_SLOT_EJECT), 1));
> > +    aml_append(scope, field);
> > +
> > +    field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_DWORD_ACC,
> > +                      AML_NOLOCK, AML_PRESERVE);
> > +    aml_append(field, /* DIMM selector, write only */
> > +        aml_named_field(stringify(MEMORY_SLOT_SLECTOR), 32));
> > +    aml_append(field, /* _OST event code, write only */
> > +        aml_named_field(stringify(MEMORY_SLOT_OST_EVENT), 32));
> > +    aml_append(field, /* _OST status code, write only */
> > +        aml_named_field(stringify(MEMORY_SLOT_OST_STATUS), 32));
> > +    aml_append(scope, field);
> > +    aml_append(sb_scope, scope);
> > +
> > +    for (i = 0; i < nr_mem; i++) {
> > +        #define BASEPATH "\\_SB.PCI0." stringify(MEMORY_HOTPLUG_DEVICE) "."
> 
> Again we'll have to clean this up down the line.
> All #defines should start at the 1st column.
> And we should not pollute global namespace like this.
> Would ACPI_MEMHP_BASEPATH be all that bad? I think not.
> Existing code so can be a separate patch on top.
I can do it on top of series if you don't object.

> 
> > +        const char *s;
> > +
> > +        dev = aml_device("MP%02X", i);
> > +        aml_append(dev, aml_name_decl("_UID", aml_string("0x%02X", i)));
> > +        aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0C80")));
> > +
> > +        method = aml_method("_CRS", 0, AML_NOTSERIALIZED);
> > +        s = BASEPATH stringify(MEMORY_SLOT_CRS_METHOD);
> > +        aml_append(method, aml_return(aml_call1(s, aml_name("_UID"))));
> > +        aml_append(dev, method);
> > +
> > +        method = aml_method("_STA", 0, AML_NOTSERIALIZED);
> > +        s = BASEPATH stringify(MEMORY_SLOT_STATUS_METHOD);
> > +        aml_append(method, aml_return(aml_call1(s, aml_name("_UID"))));
> > +        aml_append(dev, method);
> > +
> > +        method = aml_method("_PXM", 0, AML_NOTSERIALIZED);
> > +        s = BASEPATH stringify(MEMORY_SLOT_PROXIMITY_METHOD);
> > +        aml_append(method, aml_return(aml_call1(s, aml_name("_UID"))));
> > +        aml_append(dev, method);
> > +
> > +        method = aml_method("_OST", 3, AML_NOTSERIALIZED);
> > +        s = BASEPATH stringify(MEMORY_SLOT_OST_METHOD);
> > +        aml_append(method, aml_return(aml_call4(
> > +            s, aml_name("_UID"), aml_arg(0), aml_arg(1), aml_arg(2)
> > +        )));
> > +        aml_append(dev, method);
> > +
> > +        method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
> > +        s = BASEPATH stringify(MEMORY_SLOT_EJECT_METHOD);
> > +        aml_append(method, aml_return(aml_call2(
> > +                   s, aml_name("_UID"), aml_arg(0))));
> > +        aml_append(dev, method);
> > +
> > +        aml_append(sb_scope, dev);
> > +    }
> > +
> > +    /* build Method(MEMORY_SLOT_NOTIFY_METHOD, 2) {
> > +     *     If (LEqual(Arg0, 0x00)) {Notify(MP00, Arg1)} ... }
> > +     */
> 
> BTW this needs a cleanup. It does nothing to clarify what is
> the method doing, which by now I have forgotten :(
> ASL is generally barely readable, if one finds documenting
> C using ASL one knows one is in trouble :)
Generally, I've put ASL comments there so that whoever debugs
that code could easily correlate ASL seen in a table with C
code that produces it.

> 
> > +    method = aml_method(stringify(MEMORY_SLOT_NOTIFY_METHOD), 2,
> > +                        AML_NOTSERIALIZED);
> > +    for (i = 0; i < nr_mem; i++) {
> > +        ifctx = aml_if(aml_equal(aml_arg(0), aml_int(i)));
> > +        aml_append(ifctx,
> > +            aml_notify(aml_name("MP%.02X", i), aml_arg(1))
> > +        );
> > +        aml_append(method, ifctx);
> > +    }
> > +    aml_append(sb_scope, method);
> > +}
> > +
> >  static void
> >  build_ssdt(GArray *table_data, GArray *linker,
> >             AcpiCpuInfo *cpu, AcpiPmInfo *pm, AcpiMiscInfo *misc,
> > @@ -1206,119 +1330,8 @@ build_ssdt(GArray *table_data, GArray *linker,
> >          }
> >          aml_append(sb_scope, aml_name_decl("CPON", pkg));
> >  
> > -        /* build memory devices */
> > -        assert(nr_mem <= ACPI_MAX_RAM_SLOTS);
> > -        scope = aml_scope("\\_SB.PCI0." stringify(MEMORY_HOTPLUG_DEVICE));
> > -        aml_append(scope,
> > -            aml_name_decl(stringify(MEMORY_SLOTS_NUMBER), aml_int(nr_mem))
> > -        );
> > -
> > -        crs = aml_resource_template();
> > -        aml_append(crs,
> > -            aml_io(AML_DECODE16, pm->mem_hp_io_base, pm->mem_hp_io_base, 0,
> > -                   pm->mem_hp_io_len)
> > -        );
> > -        aml_append(scope, aml_name_decl("_CRS", crs));
> > -
> > -        aml_append(scope, aml_operation_region(
> > -            stringify(MEMORY_HOTPLUG_IO_REGION), AML_SYSTEM_IO,
> > -            pm->mem_hp_io_base, pm->mem_hp_io_len)
> > -        );
> > -
> > -        field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_DWORD_ACC,
> > -                          AML_NOLOCK, AML_PRESERVE);
> > -        aml_append(field, /* read only */
> > -            aml_named_field(stringify(MEMORY_SLOT_ADDR_LOW), 32));
> > -        aml_append(field, /* read only */
> > -            aml_named_field(stringify(MEMORY_SLOT_ADDR_HIGH), 32));
> > -        aml_append(field, /* read only */
> > -            aml_named_field(stringify(MEMORY_SLOT_SIZE_LOW), 32));
> > -        aml_append(field, /* read only */
> > -            aml_named_field(stringify(MEMORY_SLOT_SIZE_HIGH), 32));
> > -        aml_append(field, /* read only */
> > -            aml_named_field(stringify(MEMORY_SLOT_PROXIMITY), 32));
> > -        aml_append(scope, field);
> > -
> > -        field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_BYTE_ACC,
> > -                          AML_NOLOCK, AML_WRITE_AS_ZEROS);
> > -        aml_append(field, aml_reserved_field(160 /* bits, Offset(20) */));
> > -        aml_append(field, /* 1 if enabled, read only */
> > -            aml_named_field(stringify(MEMORY_SLOT_ENABLED), 1));
> > -        aml_append(field,
> > -            /*(read) 1 if has a insert event. (write) 1 to clear event */
> > -            aml_named_field(stringify(MEMORY_SLOT_INSERT_EVENT), 1));
> > -        aml_append(field,
> > -            /* (read) 1 if has a remove event. (write) 1 to clear event */
> > -            aml_named_field(stringify(MEMORY_SLOT_REMOVE_EVENT), 1));
> > -        aml_append(field,
> > -            /* initiates device eject, write only */
> > -            aml_named_field(stringify(MEMORY_SLOT_EJECT), 1));
> > -        aml_append(scope, field);
> > -
> > -        field = aml_field(stringify(MEMORY_HOTPLUG_IO_REGION), AML_DWORD_ACC,
> > -                          AML_NOLOCK, AML_PRESERVE);
> > -        aml_append(field, /* DIMM selector, write only */
> > -            aml_named_field(stringify(MEMORY_SLOT_SLECTOR), 32));
> > -        aml_append(field, /* _OST event code, write only */
> > -            aml_named_field(stringify(MEMORY_SLOT_OST_EVENT), 32));
> > -        aml_append(field, /* _OST status code, write only */
> > -            aml_named_field(stringify(MEMORY_SLOT_OST_STATUS), 32));
> > -        aml_append(scope, field);
> > -
> > -        aml_append(sb_scope, scope);
> > -
> > -        for (i = 0; i < nr_mem; i++) {
> > -            #define BASEPATH "\\_SB.PCI0." stringify(MEMORY_HOTPLUG_DEVICE) "."
> > -            const char *s;
> > -
> > -            dev = aml_device("MP%02X", i);
> > -            aml_append(dev, aml_name_decl("_UID", aml_string("0x%02X", i)));
> > -            aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0C80")));
> > -
> > -            method = aml_method("_CRS", 0, AML_NOTSERIALIZED);
> > -            s = BASEPATH stringify(MEMORY_SLOT_CRS_METHOD);
> > -            aml_append(method, aml_return(aml_call1(s, aml_name("_UID"))));
> > -            aml_append(dev, method);
> > -
> > -            method = aml_method("_STA", 0, AML_NOTSERIALIZED);
> > -            s = BASEPATH stringify(MEMORY_SLOT_STATUS_METHOD);
> > -            aml_append(method, aml_return(aml_call1(s, aml_name("_UID"))));
> > -            aml_append(dev, method);
> > -
> > -            method = aml_method("_PXM", 0, AML_NOTSERIALIZED);
> > -            s = BASEPATH stringify(MEMORY_SLOT_PROXIMITY_METHOD);
> > -            aml_append(method, aml_return(aml_call1(s, aml_name("_UID"))));
> > -            aml_append(dev, method);
> > -
> > -            method = aml_method("_OST", 3, AML_NOTSERIALIZED);
> > -            s = BASEPATH stringify(MEMORY_SLOT_OST_METHOD);
> > -            aml_append(method, aml_return(aml_call4(
> > -                s, aml_name("_UID"), aml_arg(0), aml_arg(1), aml_arg(2)
> > -            )));
> > -            aml_append(dev, method);
> > -
> > -            method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
> > -            s = BASEPATH stringify(MEMORY_SLOT_EJECT_METHOD);
> > -            aml_append(method, aml_return(aml_call2(
> > -                       s, aml_name("_UID"), aml_arg(0))));
> > -            aml_append(dev, method);
> > -
> > -            aml_append(sb_scope, dev);
> > -        }
> > -
> > -        /* build Method(MEMORY_SLOT_NOTIFY_METHOD, 2) {
> > -         *     If (LEqual(Arg0, 0x00)) {Notify(MP00, Arg1)} ... }
> > -         */
> > -        method = aml_method(stringify(MEMORY_SLOT_NOTIFY_METHOD), 2,
> > -                            AML_NOTSERIALIZED);
> > -        for (i = 0; i < nr_mem; i++) {
> > -            ifctx = aml_if(aml_equal(aml_arg(0), aml_int(i)));
> > -            aml_append(ifctx,
> > -                aml_notify(aml_name("MP%.02X", i), aml_arg(1))
> > -            );
> > -            aml_append(method, ifctx);
> > -        }
> > -        aml_append(sb_scope, method);
> > +        build_memory_devices(sb_scope, nr_mem, pm->mem_hp_io_base,
> > +                             pm->mem_hp_io_len);
> >  
> >          {
> >              Object *pci_host;
> > -- 
> > 1.8.3.1
> >