On 20/10/17 18:11, Julien Thierry wrote:
+static int __maybe_unused +tmc_etr_sg_table_rotate(struct etr_sg_table *etr_table, u64 base_offset) +{ + u32 last_entry, first_entry; + u64 last_offset; + struct tmc_sg_table *sg_table = etr_table->sg_table; + sgte_t *table_ptr = sg_table->table_vaddr; + ssize_t buf_size = tmc_sg_table_buf_size(sg_table); + + /* Offset should always be SG PAGE_SIZE aligned */ + if (base_offset & (ETR_SG_PAGE_SIZE - 1)) { + pr_debug("unaligned base offset %llx\n", base_offset); + return -EINVAL; + } + /* Make sure the offset is within the range */ + if (base_offset < 0 || base_offset > buf_size) {base_offset is unsigned, so the left operand of the '||' is useless (would've expected the compiler to emit a warning for this).+ base_offset = (base_offset + buf_size) % buf_size; + pr_debug("Resetting offset to %llx\n", base_offset); + } + first_entry = tmc_etr_sg_offset_to_table_index(base_offset); + if (first_entry == etr_table->first_entry) { + pr_debug("Head is already at %llx, skipping\n", base_offset); + return 0; + } + + /* Last entry should be the previous one to the new "base" */ + last_offset = ((base_offset - ETR_SG_PAGE_SIZE) + buf_size) % buf_size; + last_entry = tmc_etr_sg_offset_to_table_index(last_offset); + + /* Reset the current Last page to Normal and new Last page to NORMAL */Current Last page to NORMAL and new Last page to LAST?
Thanks again, will fix them Cheers Suzuki
