Re: [Qemu-devel] [RFC PATCH 2/3] nvdimm: use configurable ACPI IO base and size

[Peter Maydell <peter.maydell@linaro.org>]

On 20 July 2016 at 01:49, Kwangwoo Lee <kwangwoo.lee@sk.com> wrote:
> This patch uses configurable IO base and size to create NPIO AML for
> ACPI NFIT. Since a different architecture like AArch64 does not use
> port-mapped IO, a configurable IO base is required to create correct
> mapping of ACPI IO address and size.
>
> Signed-off-by: Kwangwoo Lee <kwangwoo.lee@sk.com>
> ---
>  hw/acpi/nvdimm.c        | 23 +++++++++++++++--------
>  hw/i386/acpi-build.c    |  2 +-
>  hw/i386/pc_piix.c       |  8 +++++++-
>  hw/i386/pc_q35.c        |  8 +++++++-
>  include/hw/mem/nvdimm.h | 17 ++++++++++++++++-
>  5 files changed, 46 insertions(+), 12 deletions(-)
>
> diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
> index e486128..57e03ee 100644
> --- a/hw/acpi/nvdimm.c
> +++ b/hw/acpi/nvdimm.c
> @@ -765,8 +765,8 @@ void nvdimm_init_acpi_state(AcpiNVDIMMState *state, MemoryRegion *io,
>                              FWCfgState *fw_cfg, Object *owner)
>  {
>      memory_region_init_io(&state->io_mr, owner, &nvdimm_dsm_ops, state,
> -                          "nvdimm-acpi-io", NVDIMM_ACPI_IO_LEN);
> -    memory_region_add_subregion(io, NVDIMM_ACPI_IO_BASE, &state->io_mr);
> +                          "nvdimm-acpi-io", state->dsm_io.size);
> +    memory_region_add_subregion(io, state->dsm_io.base, &state->io_mr);
>
>      state->dsm_mem = g_array_new(false, true /* clear */, 1);
>      acpi_data_push(state->dsm_mem, sizeof(NvdimmDsmIn));

Why does this function take a MemoryRegion to insert itself into,
rather than returning a MemoryRegion for the caller to map into
wherever is appropriate, or even being a DeviceState which has
mappable memory regions via the sysbus API ?

I guess the answer is "that's the way it happens to be at the moment",
so I'm not really asking for a change here necessarily.

> @@ -912,9 +912,10 @@ static void nvdimm_build_nvdimm_devices(GSList *device_list, Aml *root_dev)
>
>  static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
>                                GArray *table_data, BIOSLinker *linker,
> -                              GArray *dsm_dma_arrea)
> +                              AcpiNVDIMMState *acpi_nvdimm_state)
>  {
>      Aml *ssdt, *sb_scope, *dev, *field;
> +    AmlRegionSpace rs;
>      int mem_addr_offset, nvdimm_ssdt;
>
>      acpi_add_table(table_offsets, table_data);
> @@ -940,8 +941,14 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
>      aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0012")));
>
>      /* map DSM memory and IO into ACPI namespace. */
> -    aml_append(dev, aml_operation_region("NPIO", AML_SYSTEM_IO,
> -               aml_int(NVDIMM_ACPI_IO_BASE), NVDIMM_ACPI_IO_LEN));
> +    if (acpi_nvdimm_state->dsm_io.type == NVDIMM_ACPI_IO_PORT) {
> +        rs = AML_SYSTEM_IO;
> +    } else {
> +        rs = AML_SYSTEM_MEMORY;
> +    }
> +    aml_append(dev, aml_operation_region("NPIO", rs,
> +               aml_int(acpi_nvdimm_state->dsm_io.base),
> +               acpi_nvdimm_state->dsm_io.size));
>      aml_append(dev, aml_operation_region("NRAM", AML_SYSTEM_MEMORY,
>                 aml_name(NVDIMM_ACPI_MEM_ADDR), sizeof(NvdimmDsmIn)));
>
> @@ -1014,7 +1021,7 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
>                                                 NVDIMM_ACPI_MEM_ADDR);
>
>      bios_linker_loader_alloc(linker,
> -                             NVDIMM_DSM_MEM_FILE, dsm_dma_arrea,
> +                             NVDIMM_DSM_MEM_FILE, acpi_nvdimm_state->dsm_mem,
>                               sizeof(NvdimmDsmIn), false /* high memory */);
>      bios_linker_loader_add_pointer(linker,
>          ACPI_BUILD_TABLE_FILE, mem_addr_offset, sizeof(uint32_t),
> @@ -1026,7 +1033,7 @@ static void nvdimm_build_ssdt(GSList *device_list, GArray *table_offsets,
>  }
>
>  void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data,
> -                       BIOSLinker *linker, GArray *dsm_dma_arrea)
> +                       BIOSLinker *linker, AcpiNVDIMMState *acpi_nvdimm_state)
>  {
>      GSList *device_list;
>
> @@ -1037,6 +1044,6 @@ void nvdimm_build_acpi(GArray *table_offsets, GArray *table_data,
>      }
>      nvdimm_build_nfit(device_list, table_offsets, table_data, linker);
>      nvdimm_build_ssdt(device_list, table_offsets, table_data, linker,
> -                      dsm_dma_arrea);
> +                      acpi_nvdimm_state);
>      g_slist_free(device_list);
>  }
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index fbba461..54b09a9 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -2632,7 +2632,7 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
>      }
>      if (pcms->acpi_nvdimm_state.is_enabled) {
>          nvdimm_build_acpi(table_offsets, tables_blob, tables->linker,
> -                          pcms->acpi_nvdimm_state.dsm_mem);
> +                          &pcms->acpi_nvdimm_state);
>      }
>
>      /* Add tables supplied by user (if any) */
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index a07dc81..b624f59 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -298,7 +298,13 @@ static void pc_init1(MachineState *machine,
>      }
>
>      if (pcms->acpi_nvdimm_state.is_enabled) {
> -        nvdimm_init_acpi_state(&pcms->acpi_nvdimm_state, system_io,
> +        AcpiNVDIMMState *acpi_nvdimm_state = &pcms->acpi_nvdimm_state;
> +
> +        acpi_nvdimm_state->dsm_io.type = NVDIMM_ACPI_IO_PORT;
> +        acpi_nvdimm_state->dsm_io.base = NVDIMM_ACPI_IO_BASE;
> +        acpi_nvdimm_state->dsm_io.size = NVDIMM_ACPI_IO_LEN;
> +
> +        nvdimm_init_acpi_state(acpi_nvdimm_state, system_io,
>                                 pcms->fw_cfg, OBJECT(pcms));
>      }
>  }
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index c0b9961..779ac32 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -263,7 +263,13 @@ static void pc_q35_init(MachineState *machine)
>      }
>
>      if (pcms->acpi_nvdimm_state.is_enabled) {
> -        nvdimm_init_acpi_state(&pcms->acpi_nvdimm_state, system_io,
> +        AcpiNVDIMMState *acpi_nvdimm_state = &pcms->acpi_nvdimm_state;
> +
> +        acpi_nvdimm_state->dsm_io.type = NVDIMM_ACPI_IO_PORT;
> +        acpi_nvdimm_state->dsm_io.base = NVDIMM_ACPI_IO_BASE;
> +        acpi_nvdimm_state->dsm_io.size = NVDIMM_ACPI_IO_LEN;
> +
> +        nvdimm_init_acpi_state(acpi_nvdimm_state, system_io,
>                                 pcms->fw_cfg, OBJECT(pcms));
>      }
>  }

Ideally this would be a QOM object with QOM properties, rather
than an ad-hoc init function.

thanks
-- PMM