Merge branch 'pci/resource'

- Add resource_set_size() to set resource size when start has already been
  set (Ilpo Järvinen)

- Add resource_set_range() helper to set both resource start and size (Ilpo
  Järvinen)

- Use IS_ALIGNED() and resource_size() in quirk_s3_64M() instead of
  open-coding them (Ilpo Järvinen)

- Add ALIGN_DOWN_IF_NONZERO() to avoid code duplication when distributing
  resources across devices (Ilpo Järvinen)

- Improve pdev_sort_resources() warning message to be more specific (Ilpo
  Järvinen)

* pci/resource:
  PCI: Improve pdev_sort_resources() warning message
  PCI: Add ALIGN_DOWN_IF_NONZERO() helper
  PCI: Use align and resource helpers, and SZ_* in quirk_s3_64M()
  PCI: Use resource_set_{range,size}() helpers
  resource: Add resource set range and size helpers

Author: bjorn-helgaas

drivers/pci/controller/pci-tegra.c

@@ -1460,7 +1460,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 	pcie->cs = *res;
 
 	/* constrain configuration space to 4 KiB */
-	pcie->cs.end = pcie->cs.start + SZ_4K - 1;
+	resource_set_size(&pcie->cs, SZ_4K);
 
 	pcie->cfg = devm_ioremap_resource(dev, &pcie->cs);
 	if (IS_ERR(pcie->cfg)) {

drivers/pci/controller/pci-thunder-pem.c

@@ -400,9 +400,9 @@ static int thunder_pem_acpi_init(struct pci_config_window *cfg)
 		 * Reserve 64K size PEM specific resources. The full 16M range
 		 * size is required for thunder_pem_init() call.
 		 */
-		res_pem->end = res_pem->start + SZ_64K - 1;
+		resource_set_size(res_pem, SZ_64K);
 		thunder_pem_reserve_range(dev, root->segment, res_pem);
-		res_pem->end = res_pem->start + SZ_16M - 1;
+		resource_set_size(res_pem, SZ_16M);
 
 		/* Reserve PCI configuration space as well. */
 		thunder_pem_reserve_range(dev, root->segment, &cfg->res);

drivers/pci/ecam.c

@@ -55,7 +55,7 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
 	bus_range_max = resource_size(cfgres) >> bus_shift;
 	if (bus_range > bus_range_max) {
 		bus_range = bus_range_max;
-		cfg->busr.end = busr->start + bus_range - 1;
+		resource_set_size(&cfg->busr, bus_range);
 		dev_warn(dev, "ECAM area %pR can only accommodate %pR (reduced from %pR desired)\n",
 			 cfgres, &cfg->busr, busr);
 	}

drivers/pci/iov.c

@@ -327,8 +327,8 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
 		virtfn->resource[i].name = pci_name(virtfn);
 		virtfn->resource[i].flags = res->flags;
 		size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES);
-		virtfn->resource[i].start = res->start + size * id;
-		virtfn->resource[i].end = virtfn->resource[i].start + size - 1;
+		resource_set_range(&virtfn->resource[i],
+				   res->start + size * id, size);
 		rc = request_resource(res, &virtfn->resource[i]);
 		BUG_ON(rc);
 	}
@@ -804,7 +804,7 @@ static int sriov_init(struct pci_dev *dev, int pos)
 			goto failed;
 		}
 		iov->barsz[i] = resource_size(res);
-		res->end = res->start + resource_size(res) * total - 1;
+		resource_set_size(res, resource_size(res) * total);
 		pci_info(dev, "%s %pR: contains BAR %d for %d VFs\n",
 			 res_name, res, i, total);
 		i += bar64;

drivers/pci/pci.c

@@ -6679,8 +6679,7 @@ static void pci_request_resource_alignment(struct pci_dev *dev, int bar,
 	} else {
 		r->flags &= ~IORESOURCE_SIZEALIGN;
 		r->flags |= IORESOURCE_STARTALIGN;
-		r->start = align;
-		r->end = r->start + size - 1;
+		resource_set_range(r, align, size);
 	}
 	r->flags |= IORESOURCE_UNSET;
 }

drivers/pci/quirks.c

@@ -12,6 +12,7 @@
  * file, where their drivers can use them.
  */
 
+#include <linux/align.h>
 #include <linux/bitfield.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
@@ -29,6 +30,7 @@
 #include <linux/nvme.h>
 #include <linux/platform_data/x86/apple.h>
 #include <linux/pm_runtime.h>
+#include <linux/sizes.h>
 #include <linux/suspend.h>
 #include <linux/switchtec.h>
 #include "pci.h"
@@ -588,8 +590,7 @@ static void quirk_extend_bar_to_page(struct pci_dev *dev)
 		const char *r_name = pci_resource_name(dev, i);
 
 		if (r->flags & IORESOURCE_MEM && resource_size(r) < PAGE_SIZE) {
-			r->end = PAGE_SIZE - 1;
-			r->start = 0;
+			resource_set_range(r, 0, PAGE_SIZE);
 			r->flags |= IORESOURCE_UNSET;
 			pci_info(dev, "%s %pR: expanded to page size\n",
 				 r_name, r);
@@ -606,10 +607,9 @@ static void quirk_s3_64M(struct pci_dev *dev)
 {
 	struct resource *r = &dev->resource[0];
 
-	if ((r->start & 0x3ffffff) || r->end != r->start + 0x3ffffff) {
+	if (!IS_ALIGNED(r->start, SZ_64M) || resource_size(r) != SZ_64M) {
 		r->flags |= IORESOURCE_UNSET;
-		r->start = 0;
-		r->end = 0x3ffffff;
+		resource_set_range(r, 0, SZ_64M);
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_S3,	PCI_DEVICE_ID_S3_868,		quirk_s3_64M);
@@ -1344,8 +1344,7 @@ static void quirk_dunord(struct pci_dev *dev)
 	struct resource *r = &dev->resource[1];
 
 	r->flags |= IORESOURCE_UNSET;
-	r->start = 0;
-	r->end = 0xffffff;
+	resource_set_range(r, 0, SZ_16M);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DUNORD,	PCI_DEVICE_ID_DUNORD_I3000,	quirk_dunord);
 
@@ -2342,8 +2341,7 @@ static void quirk_tc86c001_ide(struct pci_dev *dev)
 
 	if (r->start & 0x8) {
 		r->flags |= IORESOURCE_UNSET;
-		r->start = 0;
-		r->end = 0xf;
+		resource_set_range(r, 0, SZ_16);
 	}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_TOSHIBA_2,
@@ -2371,8 +2369,7 @@ static void quirk_plx_pci9050(struct pci_dev *dev)
 			pci_info(dev, "Re-allocating PLX PCI 9050 BAR %u to length 256 to avoid bit 7 bug\n",
 				 bar);
 			r->flags |= IORESOURCE_UNSET;
-			r->start = 0;
-			r->end = 0xff;
+			resource_set_range(r, 0, SZ_256);
 		}
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_PLX, PCI_DEVICE_ID_PLX_9050,
@@ -3524,13 +3521,13 @@ static void quirk_intel_ntb(struct pci_dev *dev)
 	if (rc)
 		return;
 
-	dev->resource[2].end = dev->resource[2].start + ((u64) 1 << val) - 1;
+	resource_set_size(&dev->resource[2], (resource_size_t)1 << val);
 
 	rc = pci_read_config_byte(dev, 0x00D1, &val);
 	if (rc)
 		return;
 
-	dev->resource[4].end = dev->resource[4].start + ((u64) 1 << val) - 1;
+	resource_set_size(&dev->resource[4], (resource_size_t)1 << val);
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e08, quirk_intel_ntb);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0e0d, quirk_intel_ntb);

drivers/pci/setup-bus.c

@@ -134,6 +134,7 @@ static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 	int i;
 
 	pci_dev_for_each_resource(dev, r, i) {
+		const char *r_name = pci_resource_name(dev, i);
 		struct pci_dev_resource *dev_res, *tmp;
 		resource_size_t r_align;
 		struct list_head *n;
@@ -146,8 +147,8 @@ static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 
 		r_align = pci_resource_alignment(dev, r);
 		if (!r_align) {
-			pci_warn(dev, "BAR %d: %pR has bogus alignment\n",
-				 i, r);
+			pci_warn(dev, "%s %pR: alignment must not be zero\n",
+				 r_name, r);
 			continue;
 		}
 
@@ -246,8 +247,7 @@ static void reassign_resources_sorted(struct list_head *realloc_head,
 		add_size = add_res->add_size;
 		align = add_res->min_align;
 		if (!resource_size(res)) {
-			res->start = align;
-			res->end = res->start + add_size - 1;
+			resource_set_range(res, align, add_size);
 			if (pci_assign_resource(add_res->dev, idx))
 				reset_resource(res);
 		} else {
@@ -938,8 +938,7 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
 		return;
 	}
 
-	b_res->start = min_align;
-	b_res->end = b_res->start + size0 - 1;
+	resource_set_range(b_res, min_align, size0);
 	b_res->flags |= IORESOURCE_STARTALIGN;
 	if (bus->self && size1 > size0 && realloc_head) {
 		add_to_list(realloc_head, bus->self, b_res, size1-size0,
@@ -1202,8 +1201,7 @@ static void pci_bus_size_cardbus(struct pci_bus *bus,
 	 * Reserve some resources for CardBus.  We reserve a fixed amount
 	 * of bus space for CardBus bridges.
 	 */
-	b_res->start = pci_cardbus_io_size;
-	b_res->end = b_res->start + pci_cardbus_io_size - 1;
+	resource_set_range(b_res, pci_cardbus_io_size, pci_cardbus_io_size);
 	b_res->flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
 	if (realloc_head) {
 		b_res->end -= pci_cardbus_io_size;
@@ -1215,8 +1213,7 @@ static void pci_bus_size_cardbus(struct pci_bus *bus,
 	b_res = &bridge->resource[PCI_CB_BRIDGE_IO_1_WINDOW];
 	if (b_res->parent)
 		goto handle_b_res_2;
-	b_res->start = pci_cardbus_io_size;
-	b_res->end = b_res->start + pci_cardbus_io_size - 1;
+	resource_set_range(b_res, pci_cardbus_io_size, pci_cardbus_io_size);
 	b_res->flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
 	if (realloc_head) {
 		b_res->end -= pci_cardbus_io_size;
@@ -1249,8 +1246,8 @@ static void pci_bus_size_cardbus(struct pci_bus *bus,
 	 * Otherwise, allocate one region of twice the size.
 	 */
 	if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
-		b_res->start = pci_cardbus_mem_size;
-		b_res->end = b_res->start + pci_cardbus_mem_size - 1;
+		resource_set_range(b_res, pci_cardbus_mem_size,
+				   pci_cardbus_mem_size);
 		b_res->flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
 				    IORESOURCE_STARTALIGN;
 		if (realloc_head) {
@@ -1267,8 +1264,7 @@ static void pci_bus_size_cardbus(struct pci_bus *bus,
 	b_res = &bridge->resource[PCI_CB_BRIDGE_MEM_1_WINDOW];
 	if (b_res->parent)
 		goto handle_done;
-	b_res->start = pci_cardbus_mem_size;
-	b_res->end = b_res->start + b_res_3_size - 1;
+	resource_set_range(b_res, pci_cardbus_mem_size, b_res_3_size);
 	b_res->flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
 	if (realloc_head) {
 		b_res->end -= b_res_3_size;
@@ -1847,7 +1843,7 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
 		return;
 	}
 
-	res->end = res->start + new_size - 1;
+	resource_set_size(res, new_size);
 
 	/* If the resource is part of the add_list, remove it now */
 	if (add_list)
@@ -1899,6 +1895,9 @@ static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
 	}
 }
 
+#define ALIGN_DOWN_IF_NONZERO(addr, align) \
+			((align) ? ALIGN_DOWN((addr), (align)) : (addr))
+
 /*
  * io, mmio and mmio_pref contain the total amount of bridge window space
  * available. This includes the minimal space needed to cover all the
@@ -2010,8 +2009,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
 		 * what is available).
 		 */
 		align = pci_resource_alignment(dev, res);
-		io.end = align ? io.start + ALIGN_DOWN(io_per_b, align) - 1
-			       : io.start + io_per_b - 1;
+		resource_set_size(&io, ALIGN_DOWN_IF_NONZERO(io_per_b, align));
 
 		/*
 		 * The x_per_b holds the extra resource space that can be
@@ -2023,15 +2021,14 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
 
 		res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
 		align = pci_resource_alignment(dev, res);
-		mmio.end = align ? mmio.start + ALIGN_DOWN(mmio_per_b, align) - 1
-				 : mmio.start + mmio_per_b - 1;
+		resource_set_size(&mmio,
+				  ALIGN_DOWN_IF_NONZERO(mmio_per_b,align));
 		mmio.start -= resource_size(res);
 
 		res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
 		align = pci_resource_alignment(dev, res);
-		mmio_pref.end = align ? mmio_pref.start +
-					ALIGN_DOWN(mmio_pref_per_b, align) - 1
-				      : mmio_pref.start + mmio_pref_per_b - 1;
+		resource_set_size(&mmio_pref,
+				  ALIGN_DOWN_IF_NONZERO(mmio_pref_per_b, align));
 		mmio_pref.start -= resource_size(res);
 
 		pci_bus_distribute_available_resources(b, add_list, io, mmio,

drivers/pci/setup-res.c

@@ -211,8 +211,7 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
 
 	start = res->start;
 	end = res->end;
-	res->start = fw_addr;
-	res->end = res->start + size - 1;
+	resource_set_range(res, fw_addr, size);
 	res->flags &= ~IORESOURCE_UNSET;
 
 	root = pci_find_parent_resource(dev, res);
@@ -463,7 +462,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno, int size)
 	if (ret)
 		return ret;
 
-	res->end = res->start + pci_rebar_size_to_bytes(size) - 1;
+	resource_set_size(res, pci_rebar_size_to_bytes(size));
 
 	/* Check if the new config works by trying to assign everything. */
 	if (dev->bus->self) {
@@ -475,7 +474,7 @@ int pci_resize_resource(struct pci_dev *dev, int resno, int size)
 
 error_resize:
 	pci_rebar_set_size(dev, resno, old);
-	res->end = res->start + pci_rebar_size_to_bytes(old) - 1;
+	resource_set_size(res, pci_rebar_size_to_bytes(old));
 	return ret;
 }
 EXPORT_SYMBOL(pci_resize_resource);

include/linux/ioport.h

@@ -249,6 +249,38 @@ struct resource *lookup_resource(struct resource *root, resource_size_t start);
 int adjust_resource(struct resource *res, resource_size_t start,
 		    resource_size_t size);
 resource_size_t resource_alignment(struct resource *res);
+
+/**
+ * resource_set_size - Calculate resource end address from size and start
+ * @res: Resource descriptor
+ * @size: Size of the resource
+ *
+ * Calculate the end address for @res based on @size.
+ *
+ * Note: The start address of @res must be set when calling this function.
+ * Prefer resource_set_range() if setting both the start address and @size.
+ */
+static inline void resource_set_size(struct resource *res, resource_size_t size)
+{
+	res->end = res->start + size - 1;
+}
+
+/**
+ * resource_set_range - Set resource start and end addresses
+ * @res: Resource descriptor
+ * @start: Start address for the resource
+ * @size: Size of the resource
+ *
+ * Set @res start address and calculate the end address based on @size.
+ */
+static inline void resource_set_range(struct resource *res,
+				      resource_size_t start,
+				      resource_size_t size)
+{
+	res->start = start;
+	resource_set_size(res, size);
+}
+
 static inline resource_size_t resource_size(const struct resource *res)
 {
 	return res->end - res->start + 1;