Re: [PATCH v4 07/10] hw/mem/cxl_type3: Add DC extent list representative and get DC extent list mailbox support

[fan <nifan.cxl@gmail.com>]

On Fri, Feb 23, 2024 at 04:16:53PM +0900, Wonjae Lee wrote:
> On 2024-02-22 오전 3:16, nifan.cxl@gmail.com wrote:
> > From: Fan Ni <fan.ni@samsung.com>
> > 
> > Add dynamic capacity extent list representative to the definition of
> > CXLType3Dev and add get DC extent list mailbox command per
> > CXL.spec.3.1:.8.2.9.9.9.2.
> > 
> > Signed-off-by: Fan Ni <fan.ni@samsung.com>
> > ---
> >   hw/cxl/cxl-mailbox-utils.c  | 71 +++++++++++++++++++++++++++++++++++++
> >   hw/mem/cxl_type3.c          |  1 +
> >   include/hw/cxl/cxl_device.h | 23 ++++++++++++
> >   3 files changed, 95 insertions(+)
> > 
> > diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> > index f95e417683..dae7fe00ed 100644
> > --- a/hw/cxl/cxl-mailbox-utils.c
> > +++ b/hw/cxl/cxl-mailbox-utils.c
> > @@ -83,6 +83,7 @@ enum {
> >           #define CLEAR_POISON           0x2
> >       DCD_CONFIG  = 0x48,
> >           #define GET_DC_CONFIG          0x0
> > +        #define GET_DYN_CAP_EXT_LIST   0x1
> >       PHYSICAL_SWITCH = 0x51,
> >           #define IDENTIFY_SWITCH_DEVICE      0x0
> >           #define GET_PHYSICAL_PORT_STATE     0x1
> > @@ -1344,6 +1345,73 @@ static CXLRetCode cmd_dcd_get_dyn_cap_config(const struct cxl_cmd *cmd,
> >       return CXL_MBOX_SUCCESS;
> >   }
> > +/*
> > + * CXL r3.1 section 8.2.9.9.9.2:
> > + * Get Dynamic Capacity Extent List (Opcode 4801h)
> > + */
> > +static CXLRetCode cmd_dcd_get_dyn_cap_ext_list(const struct cxl_cmd *cmd,
> > +                                               uint8_t *payload_in,
> > +                                               size_t len_in,
> > +                                               uint8_t *payload_out,
> > +                                               size_t *len_out,
> > +                                               CXLCCI *cci)
> > +{
> > +    CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
> > +    struct get_dyn_cap_ext_list_in_pl {
> > +        uint32_t extent_cnt;
> > +        uint32_t start_extent_id;
> > +    } QEMU_PACKED;
> > +
> > +    struct get_dyn_cap_ext_list_out_pl {
> > +        uint32_t count;
> > +        uint32_t total_extents;
> > +        uint32_t generation_num;
> > +        uint8_t rsvd[4];
> > +        CXLDCExtentRaw records[];
> > +    } QEMU_PACKED;
> > +
> > +    struct get_dyn_cap_ext_list_in_pl *in = (void *)payload_in;
> > +    struct get_dyn_cap_ext_list_out_pl *out = (void *)payload_out;
> > +    uint16_t record_count = 0, i = 0, record_done = 0;
> > +    CXLDCExtentList *extent_list = &ct3d->dc.extents;
> > +    CXLDCExtent *ent;
> > +    uint16_t out_pl_len;
> > +    uint32_t start_extent_id = in->start_extent_id;
> > +
> > +    if (start_extent_id > ct3d->dc.total_extent_count) {
> 
> Hello,
> 
> Shouldn't it be >= rather than >?
> 
> (I accidentally replied to v3 with the same comment above, so please ignore
> that.)

The spec says "Greater than", so I will keep it as it is until there is
more clarification about this. When start_extent_id ==
total_extent_count, return 0 extents.

Fan
> 
> Thanks,
> Wonjae
>