Re: [PATCH v19 6/7] firmware: arm_rmm: Ensure the RMM has GPT entries for memory

+/*
+ * Make sure the area is tracked by RMM at FINE granularity.
+ * We do not support changing the tracking yet.
+ */
+static int rmi_verify_memory_tracking(phys_addr_t start, phys_addr_t end)
+{
+	while (start < end) {
+		unsigned long ret, category, state, next;
+
+		ret = rmi_granule_tracking_get(start, end, &category, &state, &next);
+		if (ret != RMI_SUCCESS)
+			return -ENOMEM;
+
+		if (WARN_ON(next <= start))
+			return -ENXIO;
+
+		if (state != RMI_TRACKING_FINE ||
+		    category != RMI_MEM_CATEGORY_CONVENTIONAL) {
+			/* TODO: Set granule tracking in this case */
+			pr_err("Granule tracking for region isn't fine/conventional: %llx-%lx\n",
+			       start, next);
+			return -ENODEV;
+		}
+		start = next;
+	}
+
+	return 0;
+}
+
+/*
+ * rmi_gpt_info - Query the GPT info for the given PAR.
+ * @start: Base of the physical address region
+ * @end: Top of the physical address region
+ * @out_top: Top of the physical address region for which
+ *		the GPT @out_gpt_par_state is valid
+ * @out_gpt_par_state: State of the GPT covered by [start, out_top)
+ */
+static long rmi_gpt_info(unsigned long start, unsigned long end,
+			 unsigned long *out_top,
+			 unsigned long *out_gpt_par_state)
+{
+	struct arm_smccc_1_2_regs regs = {
+		SMC_RMI_GPT_INFO, start, end,
+	};
+
+	rmi_smccc_invoke(&regs);
+	if (regs.a0 != RMI_SUCCESS)
+		return regs.a0;
+
+	if (out_top)
+		*out_top = regs.a1;
+	if (out_gpt_par_state)
+		*out_gpt_par_state = regs.a2;
+
+	return RMI_SUCCESS;
+}
+
+/*
+ * We do not support creating L1 GPTs yet. So, make sure that
+ * all the regions are managed by the firmware.
+ */
+static int rmi_verify_gpt_firmware_managed(phys_addr_t start, phys_addr_t end)
+{
+	unsigned long l0gpt_sz;
+	unsigned long next, par_state;
+
+	l0gpt_sz = 1UL << (30 + FIELD_GET(RMI_FEATURE_REGISTER_1_L0GPTSZ,
+					  rmi_feat_reg(1)));
+	start = ALIGN_DOWN(start, l0gpt_sz);
+	end = ALIGN(end, l0gpt_sz);
+
+	while (start < end) {
+		long ret = rmi_gpt_info(start, end, &next, &par_state);
+
+		if (ret != RMI_SUCCESS)
+			return -ENOMEM;

+		if (WARN_ON(next <= start))
+			return -ENXIO;
+
+		if (par_state != RMI_GPT_PAR_PLAT) {
+			pr_err("GPT for the region is not managed by firmware %llx-%lx\n",
+				start, next);
+			return -ENOMEM;