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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Implement the default iomap interfaces
4 *
5 * (C) Copyright 2004 Linus Torvalds
6 */
7#include <linux/pci.h>
8#include <linux/io.h>
9#include <linux/kmsan-checks.h>
10
11#include <linux/export.h>
12
13/*
14 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
15 * access or a MMIO access, these functions don't care. The info is
16 * encoded in the hardware mapping set up by the mapping functions
17 * (or the cookie itself, depending on implementation and hw).
18 *
19 * The generic routines don't assume any hardware mappings, and just
20 * encode the PIO/MMIO as part of the cookie. They coldly assume that
21 * the MMIO IO mappings are not in the low address range.
22 *
23 * Architectures for which this is not true can't use this generic
24 * implementation and should do their own copy.
25 */
26
27#ifndef HAVE_ARCH_PIO_SIZE
28/*
29 * We encode the physical PIO addresses (0-0xffff) into the
30 * pointer by offsetting them with a constant (0x10000) and
31 * assuming that all the low addresses are always PIO. That means
32 * we can do some sanity checks on the low bits, and don't
33 * need to just take things for granted.
34 */
35#define PIO_OFFSET 0x10000UL
36#define PIO_MASK 0x0ffffUL
37#define PIO_RESERVED 0x40000UL
38#endif
39
40static void bad_io_access(unsigned long port, const char *access)
41{
42 static int count = 10;
43 if (count) {
44 count--;
45 WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)\n", port, access);
46 }
47}
48
49/*
50 * Ugly macros are a way of life.
51 */
52#define IO_COND(addr, is_pio, is_mmio) do { \
53 unsigned long port = (unsigned long __force)addr; \
54 if (port >= PIO_RESERVED) { \
55 is_mmio; \
56 } else if (port > PIO_OFFSET) { \
57 port &= PIO_MASK; \
58 is_pio; \
59 } else \
60 bad_io_access(port, #is_pio ); \
61} while (0)
62
63#ifndef pio_read16be
64#define pio_read16be(port) swab16(inw(port))
65#define pio_read32be(port) swab32(inl(port))
66#endif
67
68#ifndef mmio_read16be
69#define mmio_read16be(addr) swab16(readw(addr))
70#define mmio_read32be(addr) swab32(readl(addr))
71#define mmio_read64be(addr) swab64(readq(addr))
72#endif
73
74/*
75 * Here and below, we apply __no_kmsan_checks to functions reading data from
76 * hardware, to ensure that KMSAN marks their return values as initialized.
77 */
78__no_kmsan_checks
79unsigned int ioread8(const void __iomem *addr)
80{
81 IO_COND(addr, return inb(port), return readb(addr));
82 return 0xff;
83}
84__no_kmsan_checks
85unsigned int ioread16(const void __iomem *addr)
86{
87 IO_COND(addr, return inw(port), return readw(addr));
88 return 0xffff;
89}
90__no_kmsan_checks
91unsigned int ioread16be(const void __iomem *addr)
92{
93 IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
94 return 0xffff;
95}
96__no_kmsan_checks
97unsigned int ioread32(const void __iomem *addr)
98{
99 IO_COND(addr, return inl(port), return readl(addr));
100 return 0xffffffff;
101}
102__no_kmsan_checks
103unsigned int ioread32be(const void __iomem *addr)
104{
105 IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
106 return 0xffffffff;
107}
108EXPORT_SYMBOL(ioread8);
109EXPORT_SYMBOL(ioread16);
110EXPORT_SYMBOL(ioread16be);
111EXPORT_SYMBOL(ioread32);
112EXPORT_SYMBOL(ioread32be);
113
114#ifdef CONFIG_64BIT
115static u64 pio_read64_lo_hi(unsigned long port)
116{
117 u64 lo, hi;
118
119 lo = inl(port);
120 hi = inl(port + sizeof(u32));
121
122 return lo | (hi << 32);
123}
124
125static u64 pio_read64_hi_lo(unsigned long port)
126{
127 u64 lo, hi;
128
129 hi = inl(port + sizeof(u32));
130 lo = inl(port);
131
132 return lo | (hi << 32);
133}
134
135static u64 pio_read64be_lo_hi(unsigned long port)
136{
137 u64 lo, hi;
138
139 lo = pio_read32be(port + sizeof(u32));
140 hi = pio_read32be(port);
141
142 return lo | (hi << 32);
143}
144
145static u64 pio_read64be_hi_lo(unsigned long port)
146{
147 u64 lo, hi;
148
149 hi = pio_read32be(port);
150 lo = pio_read32be(port + sizeof(u32));
151
152 return lo | (hi << 32);
153}
154
155__no_kmsan_checks
156u64 __ioread64_lo_hi(const void __iomem *addr)
157{
158 IO_COND(addr, return pio_read64_lo_hi(port), return readq(addr));
159 return 0xffffffffffffffffULL;
160}
161
162__no_kmsan_checks
163u64 __ioread64_hi_lo(const void __iomem *addr)
164{
165 IO_COND(addr, return pio_read64_hi_lo(port), return readq(addr));
166 return 0xffffffffffffffffULL;
167}
168
169__no_kmsan_checks
170u64 __ioread64be_lo_hi(const void __iomem *addr)
171{
172 IO_COND(addr, return pio_read64be_lo_hi(port),
173 return mmio_read64be(addr));
174 return 0xffffffffffffffffULL;
175}
176
177__no_kmsan_checks
178u64 __ioread64be_hi_lo(const void __iomem *addr)
179{
180 IO_COND(addr, return pio_read64be_hi_lo(port),
181 return mmio_read64be(addr));
182 return 0xffffffffffffffffULL;
183}
184
185EXPORT_SYMBOL(__ioread64_lo_hi);
186EXPORT_SYMBOL(__ioread64_hi_lo);
187EXPORT_SYMBOL(__ioread64be_lo_hi);
188EXPORT_SYMBOL(__ioread64be_hi_lo);
189
190#endif /* CONFIG_64BIT */
191
192#ifndef pio_write16be
193#define pio_write16be(val,port) outw(swab16(val),port)
194#define pio_write32be(val,port) outl(swab32(val),port)
195#endif
196
197#ifndef mmio_write16be
198#define mmio_write16be(val,port) writew(swab16(val),port)
199#define mmio_write32be(val,port) writel(swab32(val),port)
200#define mmio_write64be(val,port) writeq(swab64(val),port)
201#endif
202
203void iowrite8(u8 val, void __iomem *addr)
204{
205 /* Make sure uninitialized memory isn't copied to devices. */
206 kmsan_check_memory(&val, sizeof(val));
207 IO_COND(addr, outb(val,port), writeb(val, addr));
208}
209void iowrite16(u16 val, void __iomem *addr)
210{
211 /* Make sure uninitialized memory isn't copied to devices. */
212 kmsan_check_memory(&val, sizeof(val));
213 IO_COND(addr, outw(val,port), writew(val, addr));
214}
215void iowrite16be(u16 val, void __iomem *addr)
216{
217 /* Make sure uninitialized memory isn't copied to devices. */
218 kmsan_check_memory(&val, sizeof(val));
219 IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
220}
221void iowrite32(u32 val, void __iomem *addr)
222{
223 /* Make sure uninitialized memory isn't copied to devices. */
224 kmsan_check_memory(&val, sizeof(val));
225 IO_COND(addr, outl(val,port), writel(val, addr));
226}
227void iowrite32be(u32 val, void __iomem *addr)
228{
229 /* Make sure uninitialized memory isn't copied to devices. */
230 kmsan_check_memory(&val, sizeof(val));
231 IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
232}
233EXPORT_SYMBOL(iowrite8);
234EXPORT_SYMBOL(iowrite16);
235EXPORT_SYMBOL(iowrite16be);
236EXPORT_SYMBOL(iowrite32);
237EXPORT_SYMBOL(iowrite32be);
238
239#ifdef CONFIG_64BIT
240static void pio_write64_lo_hi(u64 val, unsigned long port)
241{
242 outl(val, port);
243 outl(val >> 32, port + sizeof(u32));
244}
245
246static void pio_write64_hi_lo(u64 val, unsigned long port)
247{
248 outl(val >> 32, port + sizeof(u32));
249 outl(val, port);
250}
251
252static void pio_write64be_lo_hi(u64 val, unsigned long port)
253{
254 pio_write32be(val, port + sizeof(u32));
255 pio_write32be(val >> 32, port);
256}
257
258static void pio_write64be_hi_lo(u64 val, unsigned long port)
259{
260 pio_write32be(val >> 32, port);
261 pio_write32be(val, port + sizeof(u32));
262}
263
264void __iowrite64_lo_hi(u64 val, void __iomem *addr)
265{
266 /* Make sure uninitialized memory isn't copied to devices. */
267 kmsan_check_memory(&val, sizeof(val));
268 IO_COND(addr, pio_write64_lo_hi(val, port),
269 writeq(val, addr));
270}
271
272void __iowrite64_hi_lo(u64 val, void __iomem *addr)
273{
274 /* Make sure uninitialized memory isn't copied to devices. */
275 kmsan_check_memory(&val, sizeof(val));
276 IO_COND(addr, pio_write64_hi_lo(val, port),
277 writeq(val, addr));
278}
279
280void __iowrite64be_lo_hi(u64 val, void __iomem *addr)
281{
282 /* Make sure uninitialized memory isn't copied to devices. */
283 kmsan_check_memory(&val, sizeof(val));
284 IO_COND(addr, pio_write64be_lo_hi(val, port),
285 mmio_write64be(val, addr));
286}
287
288void __iowrite64be_hi_lo(u64 val, void __iomem *addr)
289{
290 /* Make sure uninitialized memory isn't copied to devices. */
291 kmsan_check_memory(&val, sizeof(val));
292 IO_COND(addr, pio_write64be_hi_lo(val, port),
293 mmio_write64be(val, addr));
294}
295
296EXPORT_SYMBOL(__iowrite64_lo_hi);
297EXPORT_SYMBOL(__iowrite64_hi_lo);
298EXPORT_SYMBOL(__iowrite64be_lo_hi);
299EXPORT_SYMBOL(__iowrite64be_hi_lo);
300
301#endif /* CONFIG_64BIT */
302
303/*
304 * These are the "repeat MMIO read/write" functions.
305 * Note the "__raw" accesses, since we don't want to
306 * convert to CPU byte order. We write in "IO byte
307 * order" (we also don't have IO barriers).
308 */
309#ifndef mmio_insb
310static inline void mmio_insb(const void __iomem *addr, u8 *dst, int count)
311{
312 while (--count >= 0) {
313 u8 data = __raw_readb(addr);
314 *dst = data;
315 dst++;
316 }
317}
318static inline void mmio_insw(const void __iomem *addr, u16 *dst, int count)
319{
320 while (--count >= 0) {
321 u16 data = __raw_readw(addr);
322 *dst = data;
323 dst++;
324 }
325}
326static inline void mmio_insl(const void __iomem *addr, u32 *dst, int count)
327{
328 while (--count >= 0) {
329 u32 data = __raw_readl(addr);
330 *dst = data;
331 dst++;
332 }
333}
334#endif
335
336#ifndef mmio_outsb
337static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
338{
339 while (--count >= 0) {
340 __raw_writeb(*src, addr);
341 src++;
342 }
343}
344static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
345{
346 while (--count >= 0) {
347 __raw_writew(*src, addr);
348 src++;
349 }
350}
351static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
352{
353 while (--count >= 0) {
354 __raw_writel(*src, addr);
355 src++;
356 }
357}
358#endif
359
360void ioread8_rep(const void __iomem *addr, void *dst, unsigned long count)
361{
362 IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
363 /* KMSAN must treat values read from devices as initialized. */
364 kmsan_unpoison_memory(dst, count);
365}
366void ioread16_rep(const void __iomem *addr, void *dst, unsigned long count)
367{
368 IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
369 /* KMSAN must treat values read from devices as initialized. */
370 kmsan_unpoison_memory(dst, count * 2);
371}
372void ioread32_rep(const void __iomem *addr, void *dst, unsigned long count)
373{
374 IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
375 /* KMSAN must treat values read from devices as initialized. */
376 kmsan_unpoison_memory(dst, count * 4);
377}
378EXPORT_SYMBOL(ioread8_rep);
379EXPORT_SYMBOL(ioread16_rep);
380EXPORT_SYMBOL(ioread32_rep);
381
382void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
383{
384 /* Make sure uninitialized memory isn't copied to devices. */
385 kmsan_check_memory(src, count);
386 IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
387}
388void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
389{
390 /* Make sure uninitialized memory isn't copied to devices. */
391 kmsan_check_memory(src, count * 2);
392 IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
393}
394void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
395{
396 /* Make sure uninitialized memory isn't copied to devices. */
397 kmsan_check_memory(src, count * 4);
398 IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
399}
400EXPORT_SYMBOL(iowrite8_rep);
401EXPORT_SYMBOL(iowrite16_rep);
402EXPORT_SYMBOL(iowrite32_rep);
403
404#ifdef CONFIG_HAS_IOPORT_MAP
405/* Create a virtual mapping cookie for an IO port range */
406void __iomem *ioport_map(unsigned long port, unsigned int nr)
407{
408 if (port > PIO_MASK)
409 return NULL;
410 return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
411}
412
413void ioport_unmap(void __iomem *addr)
414{
415 /* Nothing to do */
416}
417EXPORT_SYMBOL(ioport_map);
418EXPORT_SYMBOL(ioport_unmap);
419#endif /* CONFIG_HAS_IOPORT_MAP */
420
421#ifdef CONFIG_PCI
422/* Hide the details if this is a MMIO or PIO address space and just do what
423 * you expect in the correct way. */
424void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
425{
426 IO_COND(addr, /* nothing */, iounmap(addr));
427}
428EXPORT_SYMBOL(pci_iounmap);
429#endif /* CONFIG_PCI */