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hc
2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565 
 kernel/arch/powerpc/kernel/pci_64.c
....@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * Port for PPC64 David Engebretsen, IBM Corp.
34  * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
45  * 
56  * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
67  *   Rework, based on alpha PCI code.
7
- *
8
- *      This program is free software; you can redistribute it and/or
9
- *      modify it under the terms of the GNU General Public License
10
- *      as published by the Free Software Foundation; either version
11
- *      2 of the License, or (at your option) any later version.
128  */
139 
1410 #undef DEBUG
....@@ -58,13 +54,19 @@
5854 	pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
5955 
6056 	/* Scan all of the recorded PCI controllers.  */
61
-	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
57
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
6258 		pcibios_scan_phb(hose);
63
-		pci_bus_add_devices(hose->bus);
64
-	}
6559 
6660 	/* Call common code to handle resource allocation */
6761 	pcibios_resource_survey();
62
+
63
+	/* Add devices. */
64
+	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
65
+		pci_bus_add_devices(hose->bus);
66
+
67
+	/* Call machine dependent fixup */
68
+	if (ppc_md.pcibios_fixup)
69
+		ppc_md.pcibios_fixup();
6870 
6971 	printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");
7072 
....@@ -98,7 +100,7 @@
98100 			 pci_name(bus->self));
99101 
100102 #ifdef CONFIG_PPC_BOOK3S_64
101
-		__flush_hash_table_range(&init_mm, res->start + _IO_BASE,
103
+		__flush_hash_table_range(res->start + _IO_BASE,
102104 					 res->end + _IO_BASE + 1);
103105 #endif
104106 		return 0;
....@@ -107,29 +109,53 @@
107109 	/* Get the host bridge */
108110 	hose = pci_bus_to_host(bus);
109111 
110
-	/* Check if we have IOs allocated */
111
-	if (hose->io_base_alloc == NULL)
112
-		return 0;
113
-
114112 	pr_debug("IO unmapping for PHB %pOF\n", hose->dn);
115113 	pr_debug("  alloc=0x%p\n", hose->io_base_alloc);
116114 
117
-	/* This is a PHB, we fully unmap the IO area */
118
-	vunmap(hose->io_base_alloc);
119
-
115
+	iounmap(hose->io_base_alloc);
120116 	return 0;
121117 }
122118 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
123119 
124
-static int pcibios_map_phb_io_space(struct pci_controller *hose)
120
+void __iomem *ioremap_phb(phys_addr_t paddr, unsigned long size)
125121 {
126122 	struct vm_struct *area;
123
+	unsigned long addr;
124
+
125
+	WARN_ON_ONCE(paddr & ~PAGE_MASK);
126
+	WARN_ON_ONCE(size & ~PAGE_MASK);
127
+
128
+	/*
129
+	 * Let's allocate some IO space for that guy. We don't pass VM_IOREMAP
130
+	 * because we don't care about alignment tricks that the core does in
131
+	 * that case.  Maybe we should due to stupid card with incomplete
132
+	 * address decoding but I'd rather not deal with those outside of the
133
+	 * reserved 64K legacy region.
134
+	 */
135
+	area = __get_vm_area_caller(size, 0, PHB_IO_BASE, PHB_IO_END,
136
+				    __builtin_return_address(0));
137
+	if (!area)
138
+		return NULL;
139
+
140
+	addr = (unsigned long)area->addr;
141
+	if (ioremap_page_range(addr, addr + size, paddr,
142
+			pgprot_noncached(PAGE_KERNEL))) {
143
+		unmap_kernel_range(addr, size);
144
+		return NULL;
145
+	}
146
+
147
+	return (void __iomem *)addr;
148
+}
149
+EXPORT_SYMBOL_GPL(ioremap_phb);
150
+
151
+static int pcibios_map_phb_io_space(struct pci_controller *hose)
152
+{
127153 	unsigned long phys_page;
128154 	unsigned long size_page;
129155 	unsigned long io_virt_offset;
130156 
131
-	phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
132
-	size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);
157
+	phys_page = ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
158
+	size_page = ALIGN(hose->pci_io_size, PAGE_SIZE);
133159 
134160 	/* Make sure IO area address is clear */
135161 	hose->io_base_alloc = NULL;
....@@ -144,23 +170,17 @@
144170 	 * with incomplete address decoding but I'd rather not deal with
145171 	 * those outside of the reserved 64K legacy region.
146172 	 */
147
-	area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
148
-	if (area == NULL)
173
+	hose->io_base_alloc = ioremap_phb(phys_page, size_page);
174
+	if (!hose->io_base_alloc)
149175 		return -ENOMEM;
150
-	hose->io_base_alloc = area->addr;
151
-	hose->io_base_virt = (void __iomem *)(area->addr +
152
-					      hose->io_base_phys - phys_page);
176
+	hose->io_base_virt = hose->io_base_alloc +
177
+				hose->io_base_phys - phys_page;
153178 
154179 	pr_debug("IO mapping for PHB %pOF\n", hose->dn);
155180 	pr_debug("  phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
156181 		 hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
157182 	pr_debug("  size=0x%016llx (alloc=0x%016lx)\n",
158183 		 hose->pci_io_size, size_page);
159
-
160
-	/* Establish the mapping */
161
-	if (__ioremap_at(phys_page, area->addr, size_page,
162
-			 pgprot_val(pgprot_noncached(__pgprot(0)))) == NULL)
163
-		return -ENOMEM;
164184 
165185 	/* Fixup hose IO resource */
166186 	io_virt_offset = pcibios_io_space_offset(hose);