On Wed 11 Oct 14:29 PDT 2017, Chris Lew wrote:
> From: Chris Lew <clew@xxxxxxxxxxxxxx>
>
> In V12 SMEM, SBL writes SMEM parameter information after the TOC. Use
> the SBL provided item count as the max item number.
>
Acked-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Regards,
Bjorn
> Signed-off-by: Chris Lew <clew@xxxxxxxxxxxxxx>
> ---
>
> Changes since v1:
> - Change num_items to __le16 from __le32
> - Move max smem item warning to generic get/alloc functions
> - Use get ptable helper function
>
> Changes since v2:
> - Rename qcom_smem_get_dynamic_item to qcom_smem_get_item_count
> - Reduce subject to 50 chars and wrap summary to 72 chars
>
> drivers/soc/qcom/smem.c | 51 +++++++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 45 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
> index 6a3134e9c591..19704baa65f4 100644
> --- a/drivers/soc/qcom/smem.c
> +++ b/drivers/soc/qcom/smem.c
> @@ -223,6 +223,24 @@ struct smem_private_entry {
> #define SMEM_PRIVATE_CANARY 0xa5a5
>
> /**
> + * struct smem_info - smem region info located after the table of contents
> + * @magic: magic number, must be SMEM_INFO_MAGIC
> + * @size: size of the smem region
> + * @base_addr: base address of the smem region
> + * @reserved: for now reserved entry
> + * @num_items: highest accepted item number
> + */
> +struct smem_info {
> + u8 magic[4];
> + __le32 size;
> + __le32 base_addr;
> + __le32 reserved;
> + __le16 num_items;
> +};
> +
> +static const u8 SMEM_INFO_MAGIC[] = { 0x53, 0x49, 0x49, 0x49 }; /* SIII */
> +
> +/**
> * struct smem_region - representation of a chunk of memory used for smem
> * @aux_base: identifier of aux_mem base
> * @virt_base: virtual base address of memory with this aux_mem identifier
> @@ -243,6 +261,7 @@ struct smem_region {
> * @partitions: list of pointers to partitions affecting the current
> * processor/host
> * @cacheline: list of cacheline sizes for each host
> + * @item_count: max accepted item number
> * @num_regions: number of @regions
> * @regions: list of the memory regions defining the shared memory
> */
> @@ -255,6 +274,7 @@ struct qcom_smem {
> size_t global_cacheline;
> struct smem_partition_header *partitions[SMEM_HOST_COUNT];
> size_t cacheline[SMEM_HOST_COUNT];
> + u32 item_count;
>
> unsigned num_regions;
> struct smem_region regions[0];
> @@ -386,9 +406,6 @@ static int qcom_smem_alloc_global(struct qcom_smem *smem,
> struct smem_global_entry *entry;
> struct smem_header *header;
>
> - if (WARN_ON(item >= SMEM_ITEM_COUNT))
> - return -EINVAL;
> -
> header = smem->regions[0].virt_base;
> entry = &header->toc[item];
> if (entry->allocated)
> @@ -439,6 +456,9 @@ int qcom_smem_alloc(unsigned host, unsigned item, size_t size)
> return -EINVAL;
> }
>
> + if (WARN_ON(item >= __smem->item_count))
> + return -EINVAL;
> +
> ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
> HWSPINLOCK_TIMEOUT,
> &flags);
> @@ -471,9 +491,6 @@ static void *qcom_smem_get_global(struct qcom_smem *smem,
> u32 aux_base;
> unsigned i;
>
> - if (WARN_ON(item >= SMEM_ITEM_COUNT))
> - return ERR_PTR(-EINVAL);
> -
> header = smem->regions[0].virt_base;
> entry = &header->toc[item];
> if (!entry->allocated)
> @@ -569,6 +586,9 @@ void *qcom_smem_get(unsigned host, unsigned item, size_t *size)
> if (!__smem)
> return ptr;
>
> + if (WARN_ON(item >= __smem->item_count))
> + return ERR_PTR(-EINVAL);
> +
> ret = hwspin_lock_timeout_irqsave(__smem->hwlock,
> HWSPINLOCK_TIMEOUT,
> &flags);
> @@ -656,6 +676,22 @@ static struct smem_ptable *qcom_smem_get_ptable(struct qcom_smem *smem)
> return ptable;
> }
>
> +static u32 qcom_smem_get_item_count(struct qcom_smem *smem)
> +{
> + struct smem_ptable *ptable;
> + struct smem_info *info;
> +
> + ptable = qcom_smem_get_ptable(smem);
> + if (IS_ERR_OR_NULL(ptable))
> + return SMEM_ITEM_COUNT;
> +
> + info = (struct smem_info *)&ptable->entry[ptable->num_entries];
> + if (memcmp(info->magic, SMEM_INFO_MAGIC, sizeof(info->magic)))
> + return SMEM_ITEM_COUNT;
> +
> + return le16_to_cpu(info->num_items);
> +}
> +
> static int qcom_smem_set_global_partition(struct qcom_smem *smem)
> {
> struct smem_partition_header *header;
> @@ -883,7 +919,10 @@ static int qcom_smem_probe(struct platform_device *pdev)
> ret = qcom_smem_set_global_partition(smem);
> if (ret < 0)
> return ret;
> + smem->item_count = qcom_smem_get_item_count(smem);
> + break;
> case SMEM_GLOBAL_HEAP_VERSION:
> + smem->item_count = SMEM_ITEM_COUNT;
> break;
> default:
> dev_err(&pdev->dev, "Unsupported SMEM version 0x%x\n", version);
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
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