--- zzzz-none-000/linux-3.10.107/arch/ia64/pci/pci.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/ia64/pci/pci.c	2021-02-04 17:41:59.000000000 +0000
@@ -115,30 +115,13 @@
 	.write = pci_write,
 };
 
-/* Called by ACPI when it finds a new root bus.  */
-
-static struct pci_controller *alloc_pci_controller(int seg)
-{
-	struct pci_controller *controller;
-
-	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
-	if (!controller)
-		return NULL;
-
-	controller->segment = seg;
-	controller->node = -1;
-	return controller;
-}
-
 struct pci_root_info {
-	struct acpi_device *bridge;
-	struct pci_controller *controller;
-	struct list_head resources;
-	char *name;
+	struct acpi_pci_root_info common;
+	struct pci_controller controller;
+	struct list_head io_resources;
 };
 
-static unsigned int
-new_space (u64 phys_base, int sparse)
+static unsigned int new_space(u64 phys_base, int sparse)
 {
 	u64 mmio_base;
 	int i;
@@ -153,7 +136,7 @@
 			return i;
 
 	if (num_io_spaces == MAX_IO_SPACES) {
-		printk(KERN_ERR "PCI: Too many IO port spaces "
+		pr_err("PCI: Too many IO port spaces "
 			"(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
 		return ~0;
 	}
@@ -165,42 +148,36 @@
 	return i;
 }
 
-static u64 add_io_space(struct pci_root_info *info,
-			struct acpi_resource_address64 *addr)
+static int add_io_space(struct device *dev, struct pci_root_info *info,
+			struct resource_entry *entry)
 {
-	struct resource *resource;
+	struct resource_entry *iospace;
+	struct resource *resource, *res = entry->res;
 	char *name;
 	unsigned long base, min, max, base_port;
 	unsigned int sparse = 0, space_nr, len;
 
-	resource = kzalloc(sizeof(*resource), GFP_KERNEL);
-	if (!resource) {
-		printk(KERN_ERR "PCI: No memory for %s I/O port space\n",
-			info->name);
-		goto out;
+	len = strlen(info->common.name) + 32;
+	iospace = resource_list_create_entry(NULL, len);
+	if (!iospace) {
+		dev_err(dev, "PCI: No memory for %s I/O port space\n",
+			info->common.name);
+		return -ENOMEM;
 	}
 
-	len = strlen(info->name) + 32;
-	name = kzalloc(len, GFP_KERNEL);
-	if (!name) {
-		printk(KERN_ERR "PCI: No memory for %s I/O port space name\n",
-			info->name);
-		goto free_resource;
-	}
-
-	min = addr->minimum;
-	max = min + addr->address_length - 1;
-	if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
+	if (res->flags & IORESOURCE_IO_SPARSE)
 		sparse = 1;
-
-	space_nr = new_space(addr->translation_offset, sparse);
+	space_nr = new_space(entry->offset, sparse);
 	if (space_nr == ~0)
-		goto free_name;
+		goto free_resource;
 
+	name = (char *)(iospace + 1);
+	min = res->start - entry->offset;
+	max = res->end - entry->offset;
 	base = __pa(io_space[space_nr].mmio_base);
 	base_port = IO_SPACE_BASE(space_nr);
-	snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
-		base_port + min, base_port + max);
+	snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->common.name,
+		 base_port + min, base_port + max);
 
 	/*
 	 * The SDM guarantees the legacy 0-64K space is sparse, but if the
@@ -210,237 +187,175 @@
 	if (space_nr == 0)
 		sparse = 1;
 
+	resource = iospace->res;
 	resource->name  = name;
 	resource->flags = IORESOURCE_MEM;
 	resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
 	resource->end   = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
-	insert_resource(&iomem_resource, resource);
+	if (insert_resource(&iomem_resource, resource)) {
+		dev_err(dev,
+			"can't allocate host bridge io space resource  %pR\n",
+			resource);
+		goto free_resource;
+	}
 
-	return base_port;
+	entry->offset = base_port;
+	res->start = min + base_port;
+	res->end = max + base_port;
+	resource_list_add_tail(iospace, &info->io_resources);
+
+	return 0;
 
-free_name:
-	kfree(name);
 free_resource:
-	kfree(resource);
-out:
-	return ~0;
+	resource_list_free_entry(iospace);
+	return -ENOSPC;
 }
 
-static acpi_status resource_to_window(struct acpi_resource *resource,
-				      struct acpi_resource_address64 *addr)
+/*
+ * An IO port or MMIO resource assigned to a PCI host bridge may be
+ * consumed by the host bridge itself or available to its child
+ * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
+ * to tell whether the resource is consumed by the host bridge itself,
+ * but firmware hasn't used that bit consistently, so we can't rely on it.
+ *
+ * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
+ * to be available to child bus/devices except one special case:
+ *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
+ *     to access PCI configuration space.
+ *
+ * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
+ */
+static bool resource_is_pcicfg_ioport(struct resource *res)
 {
-	acpi_status status;
-
-	/*
-	 * We're only interested in _CRS descriptors that are
-	 *	- address space descriptors for memory or I/O space
-	 *	- non-zero size
-	 *	- producers, i.e., the address space is routed downstream,
-	 *	  not consumed by the bridge itself
-	 */
-	status = acpi_resource_to_address64(resource, addr);
-	if (ACPI_SUCCESS(status) &&
-	    (addr->resource_type == ACPI_MEMORY_RANGE ||
-	     addr->resource_type == ACPI_IO_RANGE) &&
-	    addr->address_length &&
-	    addr->producer_consumer == ACPI_PRODUCER)
-		return AE_OK;
-
-	return AE_ERROR;
-}
-
-static acpi_status count_window(struct acpi_resource *resource, void *data)
-{
-	unsigned int *windows = (unsigned int *) data;
-	struct acpi_resource_address64 addr;
-	acpi_status status;
-
-	status = resource_to_window(resource, &addr);
-	if (ACPI_SUCCESS(status))
-		(*windows)++;
-
-	return AE_OK;
-}
-
-static acpi_status add_window(struct acpi_resource *res, void *data)
-{
-	struct pci_root_info *info = data;
-	struct pci_window *window;
-	struct acpi_resource_address64 addr;
-	acpi_status status;
-	unsigned long flags, offset = 0;
-	struct resource *root;
-
-	/* Return AE_OK for non-window resources to keep scanning for more */
-	status = resource_to_window(res, &addr);
-	if (!ACPI_SUCCESS(status))
-		return AE_OK;
-
-	if (addr.resource_type == ACPI_MEMORY_RANGE) {
-		flags = IORESOURCE_MEM;
-		root = &iomem_resource;
-		offset = addr.translation_offset;
-	} else if (addr.resource_type == ACPI_IO_RANGE) {
-		flags = IORESOURCE_IO;
-		root = &ioport_resource;
-		offset = add_io_space(info, &addr);
-		if (offset == ~0)
-			return AE_OK;
-	} else
-		return AE_OK;
-
-	window = &info->controller->window[info->controller->windows++];
-	window->resource.name = info->name;
-	window->resource.flags = flags;
-	window->resource.start = addr.minimum + offset;
-	window->resource.end = window->resource.start + addr.address_length - 1;
-	window->offset = offset;
-
-	if (insert_resource(root, &window->resource)) {
-		dev_err(&info->bridge->dev,
-			"can't allocate host bridge window %pR\n",
-			&window->resource);
-	} else {
-		if (offset)
-			dev_info(&info->bridge->dev, "host bridge window %pR "
-				 "(PCI address [%#llx-%#llx])\n",
-				 &window->resource,
-				 window->resource.start - offset,
-				 window->resource.end - offset);
-		else
-			dev_info(&info->bridge->dev,
-				 "host bridge window %pR\n",
-				 &window->resource);
-	}
-
-	/* HP's firmware has a hack to work around a Windows bug.
-	 * Ignore these tiny memory ranges */
-	if (!((window->resource.flags & IORESOURCE_MEM) &&
-	      (window->resource.end - window->resource.start < 16)))
-		pci_add_resource_offset(&info->resources, &window->resource,
-					window->offset);
-
-	return AE_OK;
+	return (res->flags & IORESOURCE_IO) &&
+		res->start == 0xCF8 && res->end == 0xCFF;
 }
 
+static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
+{
+	struct device *dev = &ci->bridge->dev;
+	struct pci_root_info *info;
+	struct resource *res;
+	struct resource_entry *entry, *tmp;
+	int status;
+
+	status = acpi_pci_probe_root_resources(ci);
+	if (status > 0) {
+		info = container_of(ci, struct pci_root_info, common);
+		resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+			res = entry->res;
+			if (res->flags & IORESOURCE_MEM) {
+				/*
+				 * HP's firmware has a hack to work around a
+				 * Windows bug. Ignore these tiny memory ranges.
+				 */
+				if (resource_size(res) <= 16) {
+					resource_list_del(entry);
+					insert_resource(&iomem_resource,
+							entry->res);
+					resource_list_add_tail(entry,
+							&info->io_resources);
+				}
+			} else if (res->flags & IORESOURCE_IO) {
+				if (resource_is_pcicfg_ioport(entry->res))
+					resource_list_destroy_entry(entry);
+				else if (add_io_space(dev, info, entry))
+					resource_list_destroy_entry(entry);
+			}
+		}
+	}
+
+	return status;
+}
+
+static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
+{
+	struct pci_root_info *info;
+	struct resource_entry *entry, *tmp;
+
+	info = container_of(ci, struct pci_root_info, common);
+	resource_list_for_each_entry_safe(entry, tmp, &info->io_resources) {
+		release_resource(entry->res);
+		resource_list_destroy_entry(entry);
+	}
+	kfree(info);
+}
+
+static struct acpi_pci_root_ops pci_acpi_root_ops = {
+	.pci_ops = &pci_root_ops,
+	.release_info = pci_acpi_root_release_info,
+	.prepare_resources = pci_acpi_root_prepare_resources,
+};
+
 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 {
 	struct acpi_device *device = root->device;
-	int domain = root->segment;
-	int bus = root->secondary.start;
-	struct pci_controller *controller;
-	unsigned int windows = 0;
-	struct pci_root_info info;
-	struct pci_bus *pbus;
-	char *name;
-	int pxm;
+	struct pci_root_info *info;
 
-	controller = alloc_pci_controller(domain);
-	if (!controller)
-		goto out1;
-
-	controller->acpi_handle = device->handle;
-
-	pxm = acpi_get_pxm(controller->acpi_handle);
-#ifdef CONFIG_NUMA
-	if (pxm >= 0)
-		controller->node = pxm_to_node(pxm);
-#endif
-
-	INIT_LIST_HEAD(&info.resources);
-	/* insert busn resource at first */
-	pci_add_resource(&info.resources, &root->secondary);
-	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
-			&windows);
-	if (windows) {
-		controller->window =
-			kzalloc_node(sizeof(*controller->window) * windows,
-				     GFP_KERNEL, controller->node);
-		if (!controller->window)
-			goto out2;
-
-		name = kmalloc(16, GFP_KERNEL);
-		if (!name)
-			goto out3;
-
-		sprintf(name, "PCI Bus %04x:%02x", domain, bus);
-		info.bridge = device;
-		info.controller = controller;
-		info.name = name;
-		acpi_walk_resources(device->handle, METHOD_NAME__CRS,
-			add_window, &info);
-	}
-	/*
-	 * See arch/x86/pci/acpi.c.
-	 * The desired pci bus might already be scanned in a quirk. We
-	 * should handle the case here, but it appears that IA64 hasn't
-	 * such quirk. So we just ignore the case now.
-	 */
-	pbus = pci_create_root_bus(NULL, bus, &pci_root_ops, controller,
-				   &info.resources);
-	if (!pbus) {
-		pci_free_resource_list(&info.resources);
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		dev_err(&device->dev,
+			"pci_bus %04x:%02x: ignored (out of memory)\n",
+			root->segment, (int)root->secondary.start);
 		return NULL;
 	}
 
-	pci_scan_child_bus(pbus);
-	return pbus;
-
-out3:
-	kfree(controller->window);
-out2:
-	kfree(controller);
-out1:
-	return NULL;
+	info->controller.segment = root->segment;
+	info->controller.companion = device;
+	info->controller.node = acpi_get_node(device->handle);
+	INIT_LIST_HEAD(&info->io_resources);
+	return acpi_pci_root_create(root, &pci_acpi_root_ops,
+				    &info->common, &info->controller);
 }
 
 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 {
-	struct pci_controller *controller = bridge->bus->sysdata;
-
-	ACPI_HANDLE_SET(&bridge->dev, controller->acpi_handle);
+	/*
+	 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
+	 * here, pci_create_root_bus() has been called by someone else and
+	 * sysdata is likely to be different from what we expect.  Let it go in
+	 * that case.
+	 */
+	if (!bridge->dev.parent) {
+		struct pci_controller *controller = bridge->bus->sysdata;
+		ACPI_COMPANION_SET(&bridge->dev, controller->companion);
+	}
 	return 0;
 }
 
-static int is_valid_resource(struct pci_dev *dev, int idx)
+void pcibios_fixup_device_resources(struct pci_dev *dev)
 {
-	unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
-	struct resource *devr = &dev->resource[idx], *busr;
+	int idx;
 
 	if (!dev->bus)
-		return 0;
+		return;
 
-	pci_bus_for_each_resource(dev->bus, busr, i) {
-		if (!busr || ((busr->flags ^ devr->flags) & type_mask))
-			continue;
-		if ((devr->start) && (devr->start >= busr->start) &&
-				(devr->end <= busr->end))
-			return 1;
-	}
-	return 0;
-}
+	for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) {
+		struct resource *r = &dev->resource[idx];
 
-static void pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
-{
-	int i;
-
-	for (i = start; i < limit; i++) {
-		if (!dev->resource[i].flags)
+		if (!r->flags || r->parent || !r->start)
 			continue;
-		if ((is_valid_resource(dev, i)))
-			pci_claim_resource(dev, i);
-	}
-}
 
-void pcibios_fixup_device_resources(struct pci_dev *dev)
-{
-	pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
+		pci_claim_resource(dev, idx);
+	}
 }
 EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
 
 static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
 {
-	pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
+	int idx;
+
+	if (!dev->bus)
+		return;
+
+	for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
+		struct resource *r = &dev->resource[idx];
+
+		if (!r->flags || r->parent || !r->start)
+			continue;
+
+		pci_claim_bridge_resource(dev, idx);
+	}
 }
 
 /*
@@ -691,7 +606,7 @@
 
 	status = ia64_pal_cache_summary(&levels, &unique_caches);
 	if (status != 0) {
-		printk(KERN_ERR "%s: ia64_pal_cache_summary() failed "
+		pr_err("%s: ia64_pal_cache_summary() failed "
 			"(status=%ld)\n", __func__, status);
 		return;
 	}
@@ -699,7 +614,7 @@
 	status = ia64_pal_cache_config_info(levels - 1,
 				/* cache_type (data_or_unified)= */ 2, &cci);
 	if (status != 0) {
-		printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed "
+		pr_err("%s: ia64_pal_cache_config_info() failed "
 			"(status=%ld)\n", __func__, status);
 		return;
 	}