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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/powerpc/kernel/isa-bridge.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Routines for tracking a legacy ISA bridge
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  *
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@@ -6,11 +7,6 @@
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  * Some bits and pieces moved over from pci_64.c
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  *
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  * Copyrigh 2003 Anton Blanchard <anton@au.ibm.com>, IBM Corp.
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- *
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- *      This program is free software; you can redistribute it and/or
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- *      modify it under the terms of the GNU General Public License
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- *      as published by the Free Software Foundation; either version
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- *      2 of the License, or (at your option) any later version.
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  */
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11
 
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 #define DEBUG
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@@ -22,6 +18,7 @@
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 #include <linux/init.h>
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 #include <linux/mm.h>
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 #include <linux/notifier.h>
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+#include <linux/vmalloc.h>
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22
 
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 #include <asm/processor.h>
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 #include <asm/io.h>
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@@ -41,6 +38,22 @@
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 #define ISA_SPACE_MASK 0x1
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 #define ISA_SPACE_IO 0x1
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+
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+static void remap_isa_base(phys_addr_t pa, unsigned long size)
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+{
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+	WARN_ON_ONCE(ISA_IO_BASE & ~PAGE_MASK);
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+	WARN_ON_ONCE(pa & ~PAGE_MASK);
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+	WARN_ON_ONCE(size & ~PAGE_MASK);
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+
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+	if (slab_is_available()) {
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+		if (ioremap_page_range(ISA_IO_BASE, ISA_IO_BASE + size, pa,
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+				pgprot_noncached(PAGE_KERNEL)))
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+			unmap_kernel_range(ISA_IO_BASE, size);
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+	} else {
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+		early_ioremap_range(ISA_IO_BASE, pa, size,
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+				pgprot_noncached(PAGE_KERNEL));
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+	}
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+}
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 static void pci_process_ISA_OF_ranges(struct device_node *isa_node,
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 				      unsigned long phb_io_base_phys)
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@@ -109,15 +122,13 @@
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 	if (size > 0x10000)
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 		size = 0x10000;
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-	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
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-		     size, pgprot_val(pgprot_noncached(__pgprot(0))));
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+	remap_isa_base(phb_io_base_phys, size);
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 	return;
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 inval_range:
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 	printk(KERN_ERR "no ISA IO ranges or unexpected isa range, "
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 	       "mapping 64k\n");
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-	__ioremap_at(phb_io_base_phys, (void *)ISA_IO_BASE,
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-		     0x10000, pgprot_val(pgprot_noncached(__pgprot(0))));
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+	remap_isa_base(phb_io_base_phys, 0x10000);
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 }
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@@ -252,8 +263,7 @@
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 	 * and map it
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 	 */
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 	isa_io_base = ISA_IO_BASE;
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-	__ioremap_at(pbase, (void *)ISA_IO_BASE,
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-		     size, pgprot_val(pgprot_noncached(__pgprot(0))));
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+	remap_isa_base(pbase, size);
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 	pr_debug("ISA: Non-PCI bridge is %pOF\n", np);
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 }
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@@ -301,7 +311,7 @@
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 	isa_bridge_pcidev = NULL;
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 	/* Unmap the ISA area */
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-	__iounmap_at((void *)ISA_IO_BASE, 0x10000);
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+	unmap_kernel_range(ISA_IO_BASE, 0x10000);
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 }
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 /**
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@@ -327,8 +337,7 @@
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 		/* Check if we have no ISA device, and this happens to be one,
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 		 * register it as such if it has an OF device
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 		 */
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-		if (!isa_bridge_devnode && devnode && devnode->type &&
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-		    !strcmp(devnode->type, "isa"))
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+		if (!isa_bridge_devnode && of_node_is_type(devnode, "isa"))
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 			isa_bridge_find_late(pdev, devnode);
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 		return 0;