+static void amdgpu_ras_validate_threshold(struct amdgpu_device *adev,
+ uint32_t max_length)
+{
+ struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
+ int tmp_threshold = amdgpu_bad_page_threshold;
+ u64 val;
+
+ /*
+ * Justification of value bad_page_cnt_threshold in ras structure
+ *
+ * Generally, -1 <= amdgpu_bad_page_threshold <= max record length
+ * in eeprom, and introduce two scenarios accordingly.
+ *
+ * Bad page retirement enablement:
+ * - If amdgpu_bad_page_threshold = -1,
+ * bad_page_cnt_threshold = typical value by formula.
+ *
+ * - When the value from user is 0 < amdgpu_bad_page_threshold <
+ * max record length in eeprom, use it directly.
+ *
+ * Bad page retirement disablement:
+ * - If amdgpu_bad_page_threshold = 0, bad page retirement
+ * functionality is disabled, and bad_page_cnt_threshold will
+ * take no effect.
+ */
+
+ if (tmp_threshold < -1)
+ tmp_threshold = -1;
+ else if (tmp_threshold > max_length)
+ tmp_threshold = max_length;
+
+ if (tmp_threshold == -1) {
+ val = adev->gmc.mc_vram_size;
+ do_div(val, RAS_BAD_PAGE_RATE);
+ con->bad_page_cnt_threshold = min(lower_32_bits(val),
+ max_length);
+ } else {
+ con->bad_page_cnt_threshold = tmp_threshold;
+ }
+}
+