Re: [PATCH] ppc/pnv: Add a HIOMAP erase command

[Corey Minyard <minyard@acm.org>]

On Thu, Aug 20, 2020 at 09:36:50AM +0200, Cédric Le Goater wrote:
> The OPAL test suite runs a read-erase-write test on the PNOR :
> 
>   https://github.com/open-power/op-test/blob/master/testcases/OpTestPNOR.py
> 
> which revealed that the IPMI HIOMAP handlers didn't support
> HIOMAP_C_ERASE. Implement the sector erase command by writing 0xFF in
> the PNOR memory region.
> 
> Reported-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>  hw/ppc/pnv_bmc.c | 31 ++++++++++++++++++++++++++++++-
>  1 file changed, 30 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/ppc/pnv_bmc.c b/hw/ppc/pnv_bmc.c
> index 2e1a03daa45a..0fb082fcb8ee 100644
> --- a/hw/ppc/pnv_bmc.c
> +++ b/hw/ppc/pnv_bmc.c
> @@ -140,6 +140,29 @@ static uint16_t bytes_to_blocks(uint32_t bytes)
>      return bytes >> BLOCK_SHIFT;
>  }
>  
> +static uint32_t blocks_to_bytes(uint16_t blocks)
> +{
> +    return blocks << BLOCK_SHIFT;
> +}
> +
> +#define IPMI_ERR_UNSPECIFIED            0xff

Wouldn't it be better for this to be in include/hw/ipmi/ipmi.h and
be named IPMI_CC_UNSPECIFIED to match the other completion codes?

-corey

> +
> +static int hiomap_erase(PnvPnor *pnor, uint32_t offset, uint32_t size)
> +{
> +    MemTxResult result;
> +    int i;
> +
> +    for (i = 0; i < size / 4; i++) {
> +        result = memory_region_dispatch_write(&pnor->mmio, offset + i * 4,
> +                                              0xFFFFFFFF, MO_32,
> +                                              MEMTXATTRS_UNSPECIFIED);
> +        if (result != MEMTX_OK) {
> +            return -1;
> +        }
> +    }
> +    return 0;
> +}
> +
>  static void hiomap_cmd(IPMIBmcSim *ibs, uint8_t *cmd, unsigned int cmd_len,
>                         RspBuffer *rsp)
>  {
> @@ -155,10 +178,16 @@ static void hiomap_cmd(IPMIBmcSim *ibs, uint8_t *cmd, unsigned int cmd_len,
>      switch (cmd[2]) {
>      case HIOMAP_C_MARK_DIRTY:
>      case HIOMAP_C_FLUSH:
> -    case HIOMAP_C_ERASE:
>      case HIOMAP_C_ACK:
>          break;
>  
> +    case HIOMAP_C_ERASE:
> +        if (hiomap_erase(pnor, blocks_to_bytes(cmd[5] << 8 | cmd[4]),
> +                        blocks_to_bytes(cmd[7] << 8 | cmd[6]))) {
> +            rsp_buffer_set_error(rsp, IPMI_ERR_UNSPECIFIED);
> +        }
> +        break;
> +
>      case HIOMAP_C_GET_INFO:
>          rsp_buffer_push(rsp, 2);  /* Version 2 */
>          rsp_buffer_push(rsp, BLOCK_SHIFT); /* block size */
> -- 
> 2.25.4
> 
>