Re: [PATCH v6 21/43] hw/cxl/device: Plumb real Label Storage Area (LSA) sizing

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

On Wed, 02 Mar 2022 10:01:48 +0000
Alex Bennée <alex.bennee@linaro.org> wrote:

> Jonathan Cameron <Jonathan.Cameron@huawei.com> writes:
> 
> > From: Ben Widawsky <ben.widawsky@intel.com>
> >
> > This should introduce no change. Subsequent work will make use of this
> > new class member.
> >
> > Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > ---
> >  hw/cxl/cxl-mailbox-utils.c  |  3 +++
> >  hw/mem/cxl_type3.c          | 24 +++++++++---------------
> >  include/hw/cxl/cxl_device.h | 29 +++++++++++++++++++++++++++++
> >  3 files changed, 41 insertions(+), 15 deletions(-)
> >
> > diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> > index d022711b2a..ccf9c3d794 100644
> > --- a/hw/cxl/cxl-mailbox-utils.c
> > +++ b/hw/cxl/cxl-mailbox-utils.c
> > @@ -278,6 +278,8 @@ static ret_code cmd_identify_memory_device(struct cxl_cmd *cmd,
> >      } __attribute__((packed)) *id;
> >      _Static_assert(sizeof(*id) == 0x43, "Bad identify size");
> >  
> > +    CXLType3Dev *ct3d = container_of(cxl_dstate, CXLType3Dev, cxl_dstate);
> > +    CXLType3Class *cvc = CXL_TYPE3_DEV_GET_CLASS(ct3d);
> >      uint64_t size = cxl_dstate->pmem_size;
> >  
> >      if (!QEMU_IS_ALIGNED(size, 256 << 20)) {
> > @@ -292,6 +294,7 @@ static ret_code cmd_identify_memory_device(struct cxl_cmd *cmd,
> >  
> >      id->total_capacity = size / (256 << 20);
> >      id->persistent_capacity = size / (256 << 20);
> > +    id->lsa_size = cvc->get_lsa_size(ct3d);
> >  
> >      *len = sizeof(*id);
> >      return CXL_MBOX_SUCCESS;
> > diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
> > index da091157f2..b16262d3cc 100644
> > --- a/hw/mem/cxl_type3.c
> > +++ b/hw/mem/cxl_type3.c
> > @@ -13,21 +13,6 @@
> >  #include "sysemu/hostmem.h"
> >  #include "hw/cxl/cxl.h"
> >  
> > -typedef struct cxl_type3_dev {
> > -    /* Private */
> > -    PCIDevice parent_obj;
> > -
> > -    /* Properties */
> > -    uint64_t size;
> > -    HostMemoryBackend *hostmem;
> > -
> > -    /* State */
> > -    CXLComponentState cxl_cstate;
> > -    CXLDeviceState cxl_dstate;
> > -} CXLType3Dev;
> > -
> > -#define CT3(obj) OBJECT_CHECK(CXLType3Dev, (obj), TYPE_CXL_TYPE3_DEV)
> > -  
> 
> If the structure had been in the header to start with it would be easier
> to see the changes added for this bit.
> 

Moved.. One other thing below.

> 
> >  static void build_dvsecs(CXLType3Dev *ct3d)
> >  {
> >      CXLComponentState *cxl_cstate = &ct3d->cxl_cstate;
> > @@ -186,10 +171,16 @@ static Property ct3_props[] = {
> >      DEFINE_PROP_END_OF_LIST(),
> >  };
> >  
> > +static uint64_t get_lsa_size(CXLType3Dev *ct3d)
> > +{
> > +    return 0;
> > +}
> > +
> >  static void ct3_class_init(ObjectClass *oc, void *data)
> >  {
> >      DeviceClass *dc = DEVICE_CLASS(oc);
> >      PCIDeviceClass *pc = PCI_DEVICE_CLASS(oc);
> > +    CXLType3Class *cvc = CXL_TYPE3_DEV_CLASS(oc);
> >  
> >      pc->realize = ct3_realize;
> >      pc->class_id = PCI_CLASS_STORAGE_EXPRESS;
> > @@ -201,11 +192,14 @@ static void ct3_class_init(ObjectClass *oc, void *data)
> >      dc->desc = "CXL PMEM Device (Type 3)";
> >      dc->reset = ct3d_reset;
> >      device_class_set_props(dc, ct3_props);
> > +
> > +    cvc->get_lsa_size = get_lsa_size;
> >  }
> >  
> >  static const TypeInfo ct3d_info = {
> >      .name = TYPE_CXL_TYPE3_DEV,
> >      .parent = TYPE_PCI_DEVICE,
> > +    .class_size = sizeof(struct CXLType3Class),
> >      .class_init = ct3_class_init,
> >      .instance_size = sizeof(CXLType3Dev),
> >      .instance_finalize = ct3_finalize,
> > diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
> > index 8102d2a813..ebb391153a 100644
> > --- a/include/hw/cxl/cxl_device.h
> > +++ b/include/hw/cxl/cxl_device.h
> > @@ -230,4 +230,33 @@ REG64(CXL_MEM_DEV_STS, 0)
> >      FIELD(CXL_MEM_DEV_STS, MBOX_READY, 4, 1)
> >      FIELD(CXL_MEM_DEV_STS, RESET_NEEDED, 5, 3)
> >  
> > +typedef struct cxl_type3_dev {
> > +    /* Private */
> > +    PCIDevice parent_obj;
> > +
> > +    /* Properties */
> > +    uint64_t size;
> > +    HostMemoryBackend *hostmem;
> > +    HostMemoryBackend *lsa;
> > +
> > +    /* State */
> > +    CXLComponentState cxl_cstate;
> > +    CXLDeviceState cxl_dstate;
> > +} CXLType3Dev;
> > +
> > +#ifndef TYPE_CXL_TYPE3_DEV
> > +#define TYPE_CXL_TYPE3_DEV "cxl-type3"
> > +#endif

I'm not sure why the ifndef is needed. Probably a legacy of some
refactoring, so I've dropped that and the other definition of this
in cxl.h

> > +
> > +#define CT3(obj) OBJECT_CHECK(CXLType3Dev, (obj), TYPE_CXL_TYPE3_DEV)
> > +OBJECT_DECLARE_TYPE(CXLType3Device, CXLType3Class, CXL_TYPE3_DEV)
> > +
> > +struct CXLType3Class {
> > +    /* Private */
> > +    PCIDeviceClass parent_class;
> > +
> > +    /* public */
> > +    uint64_t (*get_lsa_size)(CXLType3Dev *ct3d);
> > +};
> > +
> >  #endif  
> 
>