[1/5] ppc/pnv: Add a PNOR model

From: Cédric Le Goater <clg@fr.ibm.com>

On a POWERPC PowerNV system, the host firmware is stored in a PNOR
flash chip which contents is mapped on the LPC bus. This model adds a
simple dummy device to map the contents of a block device in the host
address space.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 include/hw/ppc/pnv.h      |   3 +
 include/hw/ppc/pnv_pnor.h |  25 +++++++
 hw/ppc/pnv.c              |  14 ++++
 hw/ppc/pnv_pnor.c         | 135 ++++++++++++++++++++++++++++++++++++++
 hw/ppc/Makefile.objs      |   4 +-
 5 files changed, 180 insertions(+), 1 deletion(-)
 create mode 100644 include/hw/ppc/pnv_pnor.h
 create mode 100644 hw/ppc/pnv_pnor.c

On Mon, Oct 21, 2019 at 03:12:11PM +0200, Cédric Le Goater wrote:
> From: Cédric Le Goater <clg@fr.ibm.com>
> 
> On a POWERPC PowerNV system, the host firmware is stored in a PNOR
> flash chip which contents is mapped on the LPC bus. This model adds a
> simple dummy device to map the contents of a block device in the host
> address space.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Applied to ppc-for-4.2.  The rest of the series will need acks for the
generic IPMI changes, of course.

> ---
>  include/hw/ppc/pnv.h      |   3 +
>  include/hw/ppc/pnv_pnor.h |  25 +++++++
>  hw/ppc/pnv.c              |  14 ++++
>  hw/ppc/pnv_pnor.c         | 135 ++++++++++++++++++++++++++++++++++++++
>  hw/ppc/Makefile.objs      |   4 +-
>  5 files changed, 180 insertions(+), 1 deletion(-)
>  create mode 100644 include/hw/ppc/pnv_pnor.h
>  create mode 100644 hw/ppc/pnv_pnor.c
> 
> diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
> index 5e01a9f3df95..e2f20f2b0bc4 100644
> --- a/include/hw/ppc/pnv.h
> +++ b/include/hw/ppc/pnv.h
> @@ -24,6 +24,7 @@
>  #include "hw/sysbus.h"
>  #include "hw/ipmi/ipmi.h"
>  #include "hw/ppc/pnv_lpc.h"
> +#include "hw/ppc/pnv_pnor.h"
>  #include "hw/ppc/pnv_psi.h"
>  #include "hw/ppc/pnv_occ.h"
>  #include "hw/ppc/pnv_homer.h"
> @@ -173,6 +174,8 @@ typedef struct PnvMachineState {
>  
>      IPMIBmc      *bmc;
>      Notifier     powerdown_notifier;
> +
> +    PnvPnor      *pnor;
>  } PnvMachineState;
>  
>  static inline bool pnv_chip_is_power9(const PnvChip *chip)
> diff --git a/include/hw/ppc/pnv_pnor.h b/include/hw/ppc/pnv_pnor.h
> new file mode 100644
> index 000000000000..dec811695c8d
> --- /dev/null
> +++ b/include/hw/ppc/pnv_pnor.h
> @@ -0,0 +1,25 @@
> +/*
> + * QEMU PowerNV PNOR simple model
> + *
> + * Copyright (c) 2019, IBM Corporation.
> + *
> + * This code is licensed under the GPL version 2 or later. See the
> + * COPYING file in the top-level directory.
> + */
> +#ifndef _PPC_PNV_PNOR_H
> +#define _PPC_PNV_PNOR_H
> +
> +#define TYPE_PNV_PNOR  "pnv-pnor"
> +#define PNV_PNOR(obj)  OBJECT_CHECK(PnvPnor, (obj), TYPE_PNV_PNOR)
> +
> +typedef struct PnvPnor {
> +    SysBusDevice   parent_obj;
> +
> +    BlockBackend   *blk;
> +
> +    uint8_t        *storage;
> +    uint32_t       size;
> +    MemoryRegion   mmio;
> +} PnvPnor;
> +
> +#endif /* _PPC_PNV_PNOR_H */
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 1a22dfd46031..b74528eba42a 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -44,6 +44,7 @@
>  #include "hw/ppc/xics.h"
>  #include "hw/qdev-properties.h"
>  #include "hw/ppc/pnv_xscom.h"
> +#include "hw/ppc/pnv_pnor.h"
>  
>  #include "hw/isa/isa.h"
>  #include "hw/boards.h"
> @@ -633,6 +634,8 @@ static void pnv_init(MachineState *machine)
>      long fw_size;
>      int i;
>      char *chip_typename;
> +    DriveInfo *pnor = drive_get(IF_MTD, 0, 0);
> +    DeviceState *dev;
>  
>      /* allocate RAM */
>      if (machine->ram_size < (1 * GiB)) {
> @@ -644,6 +647,17 @@ static void pnv_init(MachineState *machine)
>                                           machine->ram_size);
>      memory_region_add_subregion(get_system_memory(), 0, ram);
>  
> +    /*
> +     * Create our simple PNOR device
> +     */
> +    dev = qdev_create(NULL, TYPE_PNV_PNOR);
> +    if (pnor) {
> +        qdev_prop_set_drive(dev, "drive", blk_by_legacy_dinfo(pnor),
> +                            &error_abort);
> +    }
> +    qdev_init_nofail(dev);
> +    pnv->pnor = PNV_PNOR(dev);
> +
>      /* load skiboot firmware  */
>      if (bios_name == NULL) {
>          bios_name = FW_FILE_NAME;
> diff --git a/hw/ppc/pnv_pnor.c b/hw/ppc/pnv_pnor.c
> new file mode 100644
> index 000000000000..bfb1e92b0392
> --- /dev/null
> +++ b/hw/ppc/pnv_pnor.c
> @@ -0,0 +1,135 @@
> +/*
> + * QEMU PowerNV PNOR simple model
> + *
> + * Copyright (c) 2015-2019, IBM Corporation.
> + *
> + * This code is licensed under the GPL version 2 or later. See the
> + * COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qapi/error.h"
> +#include "qemu/error-report.h"
> +#include "qemu/log.h"
> +#include "sysemu/block-backend.h"
> +#include "sysemu/blockdev.h"
> +#include "hw/loader.h"
> +#include "hw/ppc/pnv_pnor.h"
> +#include "hw/qdev-properties.h"
> +
> +static uint64_t pnv_pnor_read(void *opaque, hwaddr addr, unsigned size)
> +{
> +    PnvPnor *s = PNV_PNOR(opaque);
> +    uint64_t ret = 0;
> +    int i;
> +
> +    for (i = 0; i < size; i++) {
> +        ret |= (uint64_t) s->storage[addr + i] << (8 * (size - i - 1));
> +    }
> +
> +    return ret;
> +}
> +
> +static void pnv_pnor_update(PnvPnor *s, int offset, int size)
> +{
> +    int offset_end;
> +
> +    if (s->blk) {
> +        return;
> +    }
> +
> +    offset_end = offset + size;
> +    offset = QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE);
> +    offset_end = QEMU_ALIGN_UP(offset_end, BDRV_SECTOR_SIZE);
> +
> +    blk_pwrite(s->blk, offset, s->storage + offset,
> +               offset_end - offset, 0);
> +}
> +
> +static void pnv_pnor_write(void *opaque, hwaddr addr, uint64_t data,
> +                           unsigned size)
> +{
> +    PnvPnor *s = PNV_PNOR(opaque);
> +    int i;
> +
> +    for (i = 0; i < size; i++) {
> +        s->storage[addr + i] = (data >> (8 * (size - i - 1))) & 0xFF;
> +    }
> +    pnv_pnor_update(s, addr, size);
> +}
> +
> +/*
> + * TODO: Check endianness: skiboot is BIG, Aspeed AHB is LITTLE, flash
> + * is BIG.
> + */
> +static const MemoryRegionOps pnv_pnor_ops = {
> +    .read = pnv_pnor_read,
> +    .write = pnv_pnor_write,
> +    .endianness = DEVICE_BIG_ENDIAN,
> +    .valid = {
> +        .min_access_size = 1,
> +        .max_access_size = 4,
> +    },
> +};
> +
> +static void pnv_pnor_realize(DeviceState *dev, Error **errp)
> +{
> +    PnvPnor *s = PNV_PNOR(dev);
> +    int ret;
> +
> +    if (s->blk) {
> +        uint64_t perm = BLK_PERM_CONSISTENT_READ |
> +                        (blk_is_read_only(s->blk) ? 0 : BLK_PERM_WRITE);
> +        ret = blk_set_perm(s->blk, perm, BLK_PERM_ALL, errp);
> +        if (ret < 0) {
> +            return;
> +        }
> +
> +        s->size = blk_getlength(s->blk);
> +        if (s->size <= 0) {
> +            error_setg(errp, "failed to get flash size");
> +            return;
> +        }
> +
> +        s->storage = blk_blockalign(s->blk, s->size);
> +
> +        if (blk_pread(s->blk, 0, s->storage, s->size) != s->size) {
> +            error_setg(errp, "failed to read the initial flash content");
> +            return;
> +        }
> +    } else {
> +        s->storage = blk_blockalign(NULL, s->size);
> +        memset(s->storage, 0xFF, s->size);
> +    }
> +
> +    memory_region_init_io(&s->mmio, OBJECT(s), &pnv_pnor_ops, s,
> +                          TYPE_PNV_PNOR, s->size);
> +}
> +
> +static Property pnv_pnor_properties[] = {
> +    DEFINE_PROP_UINT32("size", PnvPnor, size, 128 << 20),
> +    DEFINE_PROP_DRIVE("drive", PnvPnor, blk),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void pnv_pnor_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +
> +    dc->realize = pnv_pnor_realize;
> +    dc->props = pnv_pnor_properties;
> +}
> +
> +static const TypeInfo pnv_pnor_info = {
> +    .name          = TYPE_PNV_PNOR,
> +    .parent        = TYPE_SYS_BUS_DEVICE,
> +    .instance_size = sizeof(PnvPnor),
> +    .class_init    = pnv_pnor_class_init,
> +};
> +
> +static void pnv_pnor_register_types(void)
> +{
> +    type_register_static(&pnv_pnor_info);
> +}
> +
> +type_init(pnv_pnor_register_types)
> diff --git a/hw/ppc/Makefile.objs b/hw/ppc/Makefile.objs
> index 580bb4f0dd4c..101e9fc59185 100644
> --- a/hw/ppc/Makefile.objs
> +++ b/hw/ppc/Makefile.objs
> @@ -9,7 +9,9 @@ obj-$(CONFIG_PSERIES) += spapr_tpm_proxy.o
>  obj-$(CONFIG_SPAPR_RNG) +=  spapr_rng.o
>  # IBM PowerNV
>  obj-$(CONFIG_POWERNV) += pnv.o pnv_xscom.o pnv_core.o pnv_lpc.o pnv_psi.o pnv_occ.o pnv_bmc.o
> -obj-$(CONFIG_POWERNV) += pnv_homer.o
> +obj-$(CONFIG_POWERNV) += pnv_homer.o pnv_pnor.o
> +
> +
>  ifeq ($(CONFIG_PCI)$(CONFIG_PSERIES)$(CONFIG_LINUX), yyy)
>  obj-y += spapr_pci_vfio.o spapr_pci_nvlink2.o
>  endif