Re: [PATCH v13 3/5] remoteproc: mt8183: add reserved memory manager API

[Alexandre Courbot <acourbot@chromium.org>]

On Tue, Jul 9, 2019 at 4:27 PM Pi-Hsun Shih <pihsun@chromium.org> wrote:
>
> From: Erin Lo <erin.lo@mediatek.com>
>
> Add memory table mapping API for other driver to lookup
> reserved physical and virtual memory
>
> Signed-off-by: Erin Lo <erin.lo@mediatek.com>
> Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
> ---
> Changes from v12:
>  - Reformat a line to fit 80 character width.
>
> Changes from v11:
>  - No change.
>
> Changes from v10:
>  - Fix some type mismatch warnings when printing debug messages.
>
> Changes from v9:
>  - No change.
>
> Changes from v8:
>  - Add more reserved regions for camera ISP.
>
> Changes from v7, v6, v5:
>  - No change.
>
> Changes from v4:
>  - New patch.
> ---
>  drivers/remoteproc/mtk_scp.c          | 136 ++++++++++++++++++++++++++
>  include/linux/platform_data/mtk_scp.h |  24 +++++
>  2 files changed, 160 insertions(+)
>
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index 4713574d1aa2..dec271f69423 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -358,6 +358,138 @@ void *scp_mapping_dm_addr(struct platform_device *pdev, u32 mem_addr)
>  }
>  EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
>
> +#if SCP_RESERVED_MEM
> +phys_addr_t scp_mem_base_phys;
> +phys_addr_t scp_mem_base_virt;
> +phys_addr_t scp_mem_size;

Can't these be static? Also scp_mem_size should probably be of type size_t.

> +
> +static struct scp_reserve_mblock scp_reserve_mblock[] = {
> +       {
> +               .num = SCP_ISP_MEM_ID,
> +               .start_phys = 0x0,
> +               .start_virt = 0x0,
> +               .size = 0x200000, /*2MB*/
> +       },
> +       {
> +               .num = SCP_ISP_MEM2_ID,
> +               .start_phys = 0x0,
> +               .start_virt = 0x0,
> +               .size = 0x800000, /*8MB*/
> +       },
> +       {
> +               .num = SCP_DIP_MEM_ID,
> +               .start_phys = 0x0,
> +               .start_virt = 0x0,
> +               .size = 0x900000, /*9MB*/
> +       },
> +       {
> +               .num = SCP_MDP_MEM_ID,
> +               .start_phys = 0x0,
> +               .start_virt = 0x0,
> +               .size = 0x600000, /*6MB*/
> +       },
> +       {
> +               .num = SCP_FD_MEM_ID,
> +               .start_phys = 0x0,
> +               .start_virt = 0x0,
> +               .size = 0x100000, /*1MB*/
> +       },
> +};
> +
> +static int scp_reserve_mem_init(struct mtk_scp *scp)
> +{
> +       enum scp_reserve_mem_id_t id;
> +       phys_addr_t accumlate_memory_size = 0;
> +
> +       scp_mem_base_phys = (phys_addr_t) (scp->phys_addr + MAX_CODE_SIZE);
> +       scp_mem_size = (phys_addr_t) (scp->dram_size - MAX_CODE_SIZE);
> +
> +       dev_info(scp->dev,
> +                "phys:0x%llx - 0x%llx (0x%llx)\n",
> +                (unsigned long long)scp_mem_base_phys,
> +                (unsigned long long)(scp_mem_base_phys + scp_mem_size),
> +                (unsigned long long)scp_mem_size);
> +       accumlate_memory_size = 0;
> +       for (id = 0; id < SCP_NUMS_MEM_ID; id++) {
> +               scp_reserve_mblock[id].start_phys =
> +                       scp_mem_base_phys + accumlate_memory_size;
> +               accumlate_memory_size += scp_reserve_mblock[id].size;
> +               dev_info(
> +                       scp->dev,
> +                       "[reserve_mem:%d]: phys:0x%llx - 0x%llx (0x%llx)\n", id,
> +                       (unsigned long long)scp_reserve_mblock[id].start_phys,
> +                       (unsigned long long)(scp_reserve_mblock[id].start_phys +
> +                                            scp_reserve_mblock[id].size),
> +                       (unsigned long long)scp_reserve_mblock[id].size);
> +       }
> +       return 0;
> +}
> +
> +static int scp_reserve_memory_ioremap(struct mtk_scp *scp)
> +{
> +       enum scp_reserve_mem_id_t id;
> +       phys_addr_t accumlate_memory_size = 0;
> +
> +       scp_mem_base_virt = (phys_addr_t)(size_t)ioremap_wc(scp_mem_base_phys,
> +                                                           scp_mem_size);
> +
> +       dev_info(scp->dev,
> +                "virt:0x%llx - 0x%llx (0x%llx)\n",
> +               (unsigned long long)scp_mem_base_virt,
> +               (unsigned long long)(scp_mem_base_virt + scp_mem_size),
> +               (unsigned long long)scp_mem_size);
> +       for (id = 0; id < SCP_NUMS_MEM_ID; id++) {
> +               scp_reserve_mblock[id].start_virt =
> +                       scp_mem_base_virt + accumlate_memory_size;
> +               accumlate_memory_size += scp_reserve_mblock[id].size;
> +       }
> +       /* the reserved memory should be larger then expected memory
> +        * or scp_reserve_mblock does not match dts
> +        */
> +       WARN_ON(accumlate_memory_size > scp_mem_size);
> +#ifdef DEBUG
> +       for (id = 0; id < NUMS_MEM_ID; id++) {
> +               dev_info(scp->dev,
> +                        "[mem_reserve-%d] phys:0x%llx,virt:0x%llx,size:0x%llx\n",
> +                        id,
> +                        scp_get_reserve_mem_phys(id),
> +                        scp_get_reserve_mem_virt(id),
> +                        scp_get_reserve_mem_size(id));
> +       }
> +#endif

I'd move this debug block to scp_map_memory_region(), right after
calling scp_reserve_memory_ioremap().

> +       return 0;
> +}
> +phys_addr_t scp_get_reserve_mem_phys(enum scp_reserve_mem_id_t id)
> +{
> +       if (id >= SCP_NUMS_MEM_ID) {
> +               pr_err("[SCP] no reserve memory for %d", id);
> +               return 0;
> +       } else

You don't need this else since the error path returns. Valid also for
the functions below.

> +               return scp_reserve_mblock[id].start_phys;
> +}
> +EXPORT_SYMBOL_GPL(scp_get_reserve_mem_phys);
> +
> +phys_addr_t scp_get_reserve_mem_virt(enum scp_reserve_mem_id_t id)
> +{
> +       if (id >= SCP_NUMS_MEM_ID) {
> +               pr_err("[SCP] no reserve memory for %d", id);
> +               return 0;
> +       } else
> +               return scp_reserve_mblock[id].start_virt;
> +}
> +EXPORT_SYMBOL_GPL(scp_get_reserve_mem_virt);
> +
> +phys_addr_t scp_get_reserve_mem_size(enum scp_reserve_mem_id_t id)
> +{
> +       if (id >= SCP_NUMS_MEM_ID) {
> +               pr_err("[SCP] no reserve memory for %d", id);
> +               return 0;
> +       } else
> +               return scp_reserve_mblock[id].size;
> +}
> +EXPORT_SYMBOL_GPL(scp_get_reserve_mem_size);
> +#endif
> +
>  static int scp_map_memory_region(struct mtk_scp *scp)
>  {
>         struct device_node *node;
> @@ -385,6 +517,10 @@ static int scp_map_memory_region(struct mtk_scp *scp)
>                 return -EBUSY;
>         }
>
> +#if SCP_RESERVED_MEM
> +       scp_reserve_mem_init(scp);
> +       scp_reserve_memory_ioremap(scp);
> +#endif
>         return 0;
>  }
>
> diff --git a/include/linux/platform_data/mtk_scp.h b/include/linux/platform_data/mtk_scp.h
> index b81ac5c7d320..96e56fdd0917 100644
> --- a/include/linux/platform_data/mtk_scp.h
> +++ b/include/linux/platform_data/mtk_scp.h
> @@ -138,4 +138,28 @@ unsigned int scp_get_venc_hw_capa(struct platform_device *pdev);
>  void *scp_mapping_dm_addr(struct platform_device *pdev,
>                           u32 mem_addr);
>
> +#define SCP_RESERVED_MEM       (1)
> +#if SCP_RESERVED_MEM
> +/* scp reserve memory ID definition*/
> +enum scp_reserve_mem_id_t {
> +       SCP_ISP_MEM_ID,
> +       SCP_ISP_MEM2_ID,
> +       SCP_MDP_MEM_ID,
> +       SCP_DIP_MEM_ID,
> +       SCP_FD_MEM_ID,
> +       SCP_NUMS_MEM_ID,
> +};
> +
> +struct scp_reserve_mblock {
> +       enum scp_reserve_mem_id_t num;
> +       u64 start_phys;
> +       u64 start_virt;
> +       u64 size;
> +};
> +
> +extern phys_addr_t scp_get_reserve_mem_phys(enum scp_reserve_mem_id_t id);
> +extern phys_addr_t scp_get_reserve_mem_virt(enum scp_reserve_mem_id_t id);
> +extern phys_addr_t scp_get_reserve_mem_size(enum scp_reserve_mem_id_t id);

Grammar nit: these should probably be called scp_get_reserved_mem_*.


> +#endif
> +
>  #endif /* _MTK_SCP_H */
> --
> 2.22.0.410.gd8fdbe21b5-goog
>
>
> _______________________________________________
> Linux-mediatek mailing list
> Linux-mediatek@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-mediatek