iommu/vt-d, trivial: simplify code with existing macros

Simplify vt-d related code with existing macros and introduce a new
macro for_each_active_drhd_unit() to enumerate all active DRHD unit.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>

drivers/iommu/dmar.c

@@ -1305,15 +1305,14 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
 int __init enable_drhd_fault_handling(void)
 {
 	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
 
 	/*
 	 * Enable fault control interrupt.
 	 */
-	for_each_drhd_unit(drhd) {
-		int ret;
-		struct intel_iommu *iommu = drhd->iommu;
+	for_each_iommu(iommu, drhd) {
 		u32 fault_status;
-		ret = dmar_set_interrupt(iommu);
+		int ret = dmar_set_interrupt(iommu);
 
 		if (ret) {
 			pr_err("DRHD %Lx: failed to enable fault, interrupt, ret %d\n",

drivers/iommu/intel-iommu.c

@@ -628,9 +628,7 @@ static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn)
 	struct dmar_drhd_unit *drhd = NULL;
 	int i;
 
-	for_each_drhd_unit(drhd) {
-		if (drhd->ignored)
-			continue;
+	for_each_active_drhd_unit(drhd) {
 		if (segment != drhd->segment)
 			continue;
 
@@ -2470,11 +2468,7 @@ static int __init init_dmars(void)
 		goto error;
 	}
 
-	for_each_drhd_unit(drhd) {
-		if (drhd->ignored)
-			continue;
-
-		iommu = drhd->iommu;
+	for_each_active_iommu(iommu, drhd) {
 		g_iommus[iommu->seq_id] = iommu;
 
 		ret = iommu_init_domains(iommu);
@@ -2498,12 +2492,7 @@ static int __init init_dmars(void)
 	/*
 	 * Start from the sane iommu hardware state.
 	 */
-	for_each_drhd_unit(drhd) {
-		if (drhd->ignored)
-			continue;
-
-		iommu = drhd->iommu;
-
+	for_each_active_iommu(iommu, drhd) {
 		/*
 		 * If the queued invalidation is already initialized by us
 		 * (for example, while enabling interrupt-remapping) then
@@ -2523,12 +2512,7 @@ static int __init init_dmars(void)
 		dmar_disable_qi(iommu);
 	}
 
-	for_each_drhd_unit(drhd) {
-		if (drhd->ignored)
-			continue;
-
-		iommu = drhd->iommu;
-
+	for_each_active_iommu(iommu, drhd) {
 		if (dmar_enable_qi(iommu)) {
 			/*
 			 * Queued Invalidate not enabled, use Register Based
@@ -2611,17 +2595,16 @@ static int __init init_dmars(void)
 	 *   global invalidate iotlb
 	 *   enable translation
 	 */
-	for_each_drhd_unit(drhd) {
+	for_each_iommu(iommu, drhd) {
 		if (drhd->ignored) {
 			/*
 			 * we always have to disable PMRs or DMA may fail on
 			 * this device
 			 */
 			if (force_on)
-				iommu_disable_protect_mem_regions(drhd->iommu);
+				iommu_disable_protect_mem_regions(iommu);
 			continue;
 		}
-		iommu = drhd->iommu;
 
 		iommu_flush_write_buffer(iommu);
 
@@ -2643,12 +2626,8 @@ static int __init init_dmars(void)
 
 	return 0;
 error:
-	for_each_drhd_unit(drhd) {
-		if (drhd->ignored)
-			continue;
-		iommu = drhd->iommu;
+	for_each_active_iommu(iommu, drhd)
 		free_iommu(iommu);
-	}
 	kfree(g_iommus);
 	return ret;
 }
@@ -3296,9 +3275,9 @@ static void __init init_no_remapping_devices(void)
 		}
 	}
 
-	for_each_drhd_unit(drhd) {
+	for_each_active_drhd_unit(drhd) {
 		int i;
-		if (drhd->ignored || drhd->include_all)
+		if (drhd->include_all)
 			continue;
 
 		for (i = 0; i < drhd->devices_cnt; i++)
@@ -3647,6 +3626,7 @@ int __init intel_iommu_init(void)
 {
 	int ret = 0;
 	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
 
 	/* VT-d is required for a TXT/tboot launch, so enforce that */
 	force_on = tboot_force_iommu();
@@ -3660,16 +3640,9 @@ int __init intel_iommu_init(void)
 	/*
 	 * Disable translation if already enabled prior to OS handover.
 	 */
-	for_each_drhd_unit(drhd) {
-		struct intel_iommu *iommu;
-
-		if (drhd->ignored)
-			continue;
-
-		iommu = drhd->iommu;
+	for_each_active_iommu(iommu, drhd)
 		if (iommu->gcmd & DMA_GCMD_TE)
 			iommu_disable_translation(iommu);
-	}
 
 	if (dmar_dev_scope_init() < 0) {
 		if (force_on)
@@ -3912,11 +3885,7 @@ static void iommu_free_vm_domain(struct dmar_domain *domain)
 	unsigned long i;
 	unsigned long ndomains;
 
-	for_each_drhd_unit(drhd) {
-		if (drhd->ignored)
-			continue;
-		iommu = drhd->iommu;
-
+	for_each_active_iommu(iommu, drhd) {
 		ndomains = cap_ndoms(iommu->cap);
 		for_each_set_bit(i, iommu->domain_ids, ndomains) {
 			if (iommu->domains[i] == domain) {

drivers/iommu/intel_irq_remapping.c

@@ -520,6 +520,7 @@ static int __init dmar_x2apic_optout(void)
 static int __init intel_irq_remapping_supported(void)
 {
 	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
 
 	if (disable_irq_remap)
 		return 0;
@@ -538,12 +539,9 @@ static int __init intel_irq_remapping_supported(void)
 	if (!dmar_ir_support())
 		return 0;
 
-	for_each_drhd_unit(drhd) {
-		struct intel_iommu *iommu = drhd->iommu;
-
+	for_each_iommu(iommu, drhd)
 		if (!ecap_ir_support(iommu->ecap))
 			return 0;
-	}
 
 	return 1;
 }
@@ -551,6 +549,7 @@ static int __init intel_irq_remapping_supported(void)
 static int __init intel_enable_irq_remapping(void)
 {
 	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
 	bool x2apic_present;
 	int setup = 0;
 	int eim = 0;
@@ -573,9 +572,7 @@ static int __init intel_enable_irq_remapping(void)
 				"Use 'intremap=no_x2apic_optout' to override BIOS request.\n");
 	}
 
-	for_each_drhd_unit(drhd) {
-		struct intel_iommu *iommu = drhd->iommu;
-
+	for_each_iommu(iommu, drhd) {
 		/*
 		 * If the queued invalidation is already initialized,
 		 * shouldn't disable it.
@@ -600,9 +597,7 @@ static int __init intel_enable_irq_remapping(void)
 	/*
 	 * check for the Interrupt-remapping support
 	 */
-	for_each_drhd_unit(drhd) {
-		struct intel_iommu *iommu = drhd->iommu;
-
+	for_each_iommu(iommu, drhd) {
 		if (!ecap_ir_support(iommu->ecap))
 			continue;
 
@@ -616,10 +611,8 @@ static int __init intel_enable_irq_remapping(void)
 	/*
 	 * Enable queued invalidation for all the DRHD's.
 	 */
-	for_each_drhd_unit(drhd) {
-		int ret;
-		struct intel_iommu *iommu = drhd->iommu;
-		ret = dmar_enable_qi(iommu);
+	for_each_iommu(iommu, drhd) {
+		int ret = dmar_enable_qi(iommu);
 
 		if (ret) {
 			printk(KERN_ERR "DRHD %Lx: failed to enable queued, "
@@ -632,9 +625,7 @@ static int __init intel_enable_irq_remapping(void)
 	/*
 	 * Setup Interrupt-remapping for all the DRHD's now.
 	 */
-	for_each_drhd_unit(drhd) {
-		struct intel_iommu *iommu = drhd->iommu;
-
+	for_each_iommu(iommu, drhd) {
 		if (!ecap_ir_support(iommu->ecap))
 			continue;
 
@@ -778,19 +769,17 @@ static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header,
 static int __init parse_ioapics_under_ir(void)
 {
 	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
 	int ir_supported = 0;
 	int ioapic_idx;
 
-	for_each_drhd_unit(drhd) {
-		struct intel_iommu *iommu = drhd->iommu;
-
+	for_each_iommu(iommu, drhd)
 		if (ecap_ir_support(iommu->ecap)) {
 			if (ir_parse_ioapic_hpet_scope(drhd->hdr, iommu))
 				return -1;
 
 			ir_supported = 1;
 		}
-	}
 
 	if (!ir_supported)
 		return 0;

include/linux/dmar.h

@@ -53,6 +53,10 @@ extern struct list_head dmar_drhd_units;
 #define for_each_drhd_unit(drhd) \
 	list_for_each_entry(drhd, &dmar_drhd_units, list)
 
+#define for_each_active_drhd_unit(drhd)					\
+	list_for_each_entry(drhd, &dmar_drhd_units, list)		\
+		if (drhd->ignored) {} else
+
 #define for_each_active_iommu(i, drhd)					\
 	list_for_each_entry(drhd, &dmar_drhd_units, list)		\
 		if (i=drhd->iommu, drhd->ignored) {} else