Re: [PATCH 2/4] hw/cxl: Add CXL_CAPACITY_MULTIPLIER definition

[Jonathan Cameron via <qemu-devel@nongnu.org>]

On Tue, 25 Oct 2022 20:47:35 -0400
Gregory Price <gourry.memverge@gmail.com> wrote:

> Remove usage of magic numbers when accessing capacity fields and replace
> with CXL_CAPACITY_MULTIPLIER, matching the kernel definition.
> 
> Signed-off-by: Gregory Price <gregory.price@memverge.com>
> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Makes sense. I'll add it to my local tree.

Depending on how timing works out, I might roll this into a wider series
of cleanups sent to Michael or we might want to keep this as part of your
series.

Jonathan
 
> ---
>  hw/cxl/cxl-mailbox-utils.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> index 3e23d29e2d..d7543fd5b4 100644
> --- a/hw/cxl/cxl-mailbox-utils.c
> +++ b/hw/cxl/cxl-mailbox-utils.c
> @@ -15,6 +15,8 @@
>  #include "qemu/log.h"
>  #include "qemu/uuid.h"
>  
> +#define CXL_CAPACITY_MULTIPLIER   0x10000000 /* SZ_256M */
> +
>  /*
>   * How to add a new command, example. The command set FOO, with cmd BAR.
>   *  1. Add the command set and cmd to the enum.
> @@ -267,7 +269,7 @@ static ret_code cmd_firmware_update_get_info(struct cxl_cmd *cmd,
>      } QEMU_PACKED *fw_info;
>      QEMU_BUILD_BUG_ON(sizeof(*fw_info) != 0x50);
>  
> -    if (cxl_dstate->pmem_size < (256 << 20)) {
> +    if (cxl_dstate->pmem_size < CXL_CAPACITY_MULTIPLIER) {
>          return CXL_MBOX_INTERNAL_ERROR;
>      }
>  
> @@ -412,7 +414,7 @@ static ret_code cmd_identify_memory_device(struct cxl_cmd *cmd,
>      CXLType3Class *cvc = CXL_TYPE3_GET_CLASS(ct3d);
>      uint64_t size = cxl_dstate->pmem_size;
>  
> -    if (!QEMU_IS_ALIGNED(size, 256 << 20)) {
> +    if (!QEMU_IS_ALIGNED(size, CXL_CAPACITY_MULTIPLIER)) {
>          return CXL_MBOX_INTERNAL_ERROR;
>      }
>  
> @@ -422,8 +424,8 @@ static ret_code cmd_identify_memory_device(struct cxl_cmd *cmd,
>      /* PMEM only */
>      snprintf(id->fw_revision, 0x10, "BWFW VERSION %02d", 0);
>  
> -    id->total_capacity = size / (256 << 20);
> -    id->persistent_capacity = size / (256 << 20);
> +    id->total_capacity = size / CXL_CAPACITY_MULTIPLIER;
> +    id->persistent_capacity = size / CXL_CAPACITY_MULTIPLIER;
>      id->lsa_size = cvc->get_lsa_size(ct3d);
>      id->poison_list_max_mer[1] = 0x1; /* 256 poison records */
>  
> @@ -444,14 +446,14 @@ static ret_code cmd_ccls_get_partition_info(struct cxl_cmd *cmd,
>      QEMU_BUILD_BUG_ON(sizeof(*part_info) != 0x20);
>      uint64_t size = cxl_dstate->pmem_size;
>  
> -    if (!QEMU_IS_ALIGNED(size, 256 << 20)) {
> +    if (!QEMU_IS_ALIGNED(size, CXL_CAPACITY_MULTIPLIER)) {
>          return CXL_MBOX_INTERNAL_ERROR;
>      }
>  
>      /* PMEM only */
>      part_info->active_vmem = 0;
>      part_info->next_vmem = 0;
> -    part_info->active_pmem = size / (256 << 20);
> +    part_info->active_pmem = size / CXL_CAPACITY_MULTIPLIER;
>      part_info->next_pmem = 0;
>  
>      *len = sizeof(*part_info);