Hi Vasant,
> +static void free_dump_sg_list(struct opal_sg_list *list)
> +{
> + struct opal_sg_list *sg1;
> + while (list) {
> + sg1 = list->next;
> + kfree(list);
> + list = sg1;
> + }
> + list = NULL;
> +}
> +
> +/*
> + * Build dump buffer scatter gather list
> + */
> +static struct opal_sg_list *dump_data_to_sglist(void)
> +{
> + struct opal_sg_list *sg1, *list = NULL;
> + void *addr;
> + int64_t size;
> +
> + addr = dump_record.buffer;
> + size = dump_record.size;
> +
> + sg1 = kzalloc(PAGE_SIZE, GFP_KERNEL);
> + if (!sg1)
> + goto nomem;
> +
> + list = sg1;
> + sg1->num_entries = 0;
> + while (size > 0) {
> + /* Translate virtual address to physical address */
> + sg1->entry[sg1->num_entries].data =
> + (void *)(vmalloc_to_pfn(addr) << PAGE_SHIFT);
> +
> + if (size > PAGE_SIZE)
> + sg1->entry[sg1->num_entries].length =
> PAGE_SIZE;
> + else
> + sg1->entry[sg1->num_entries].length = size;
> +
> + sg1->num_entries++;
> + if (sg1->num_entries >= SG_ENTRIES_PER_NODE) {
> + sg1->next = kzalloc(PAGE_SIZE, GFP_KERNEL);
> + if (!sg1->next)
> + goto nomem;
> +
> + sg1 = sg1->next;
> + sg1->num_entries = 0;
> + }
> + addr += PAGE_SIZE;
> + size -= PAGE_SIZE;
> + }
> + return list;
> +
> +nomem:
> + pr_err("%s : Failed to allocate memory\n", __func__);
> + free_dump_sg_list(list);
> + return NULL;
> +}
> +
> +/*
> + * Translate sg list address to absolute
> + */
> +static void sglist_to_phy_addr(struct opal_sg_list *list)
> +{
> + struct opal_sg_list *sg, *next;
> +
> + for (sg = list; sg; sg = next) {
> + next = sg->next;
> + /* Don't translate NULL pointer for last entry */
> + if (sg->next)
> + sg->next = (struct opal_sg_list
> *)__pa(sg->next);
> + else
> + sg->next = NULL;
> +
> + /* Convert num_entries to length */
> + sg->num_entries =
> + sg->num_entries * sizeof(struct
> opal_sg_entry) + 16;
> + }
> +}
> +
> +static void free_dump_data_buf(void)
> +{
> + vfree(dump_record.buffer);
> + dump_record.size = 0;
> +}
This looks identical to the code in opal-flash.c. Considering how
complicated it is, can we put it somewhere common?
Anton
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