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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /** |
3 | * \file drm_os_linux.h | |
4 | * OS abstraction macros. | |
5 | */ | |
6 | ||
1da177e4 | 7 | #include <linux/interrupt.h> /* For task queue support */ |
174cd4b1 | 8 | #include <linux/sched/signal.h> |
1da177e4 | 9 | #include <linux/delay.h> |
71ae3df2 | 10 | #include <linux/io-64-nonatomic-lo-hi.h> |
87f0da55 | 11 | |
1da177e4 | 12 | /** Current process ID */ |
ba25f9dc | 13 | #define DRM_CURRENTPID task_pid_nr(current) |
1da177e4 LT |
14 | #define DRM_UDELAY(d) udelay(d) |
15 | /** Read a byte from a MMIO region */ | |
16 | #define DRM_READ8(map, offset) readb(((void __iomem *)(map)->handle) + (offset)) | |
17 | /** Read a word from a MMIO region */ | |
18 | #define DRM_READ16(map, offset) readw(((void __iomem *)(map)->handle) + (offset)) | |
19 | /** Read a dword from a MMIO region */ | |
20 | #define DRM_READ32(map, offset) readl(((void __iomem *)(map)->handle) + (offset)) | |
21 | /** Write a byte into a MMIO region */ | |
22 | #define DRM_WRITE8(map, offset, val) writeb(val, ((void __iomem *)(map)->handle) + (offset)) | |
23 | /** Write a word into a MMIO region */ | |
24 | #define DRM_WRITE16(map, offset, val) writew(val, ((void __iomem *)(map)->handle) + (offset)) | |
25 | /** Write a dword into a MMIO region */ | |
26 | #define DRM_WRITE32(map, offset, val) writel(val, ((void __iomem *)(map)->handle) + (offset)) | |
87f0da55 DA |
27 | |
28 | /** Read a qword from a MMIO region - be careful using these unless you really understand them */ | |
29 | #define DRM_READ64(map, offset) readq(((void __iomem *)(map)->handle) + (offset)) | |
30 | /** Write a qword into a MMIO region */ | |
31 | #define DRM_WRITE64(map, offset, val) writeq(val, ((void __iomem *)(map)->handle) + (offset)) | |
32 | ||
1da177e4 LT |
33 | #define DRM_WAIT_ON( ret, queue, timeout, condition ) \ |
34 | do { \ | |
35 | DECLARE_WAITQUEUE(entry, current); \ | |
36 | unsigned long end = jiffies + (timeout); \ | |
37 | add_wait_queue(&(queue), &entry); \ | |
38 | \ | |
39 | for (;;) { \ | |
40 | __set_current_state(TASK_INTERRUPTIBLE); \ | |
41 | if (condition) \ | |
42 | break; \ | |
43 | if (time_after_eq(jiffies, end)) { \ | |
44 | ret = -EBUSY; \ | |
45 | break; \ | |
46 | } \ | |
47 | schedule_timeout((HZ/100 > 1) ? HZ/100 : 1); \ | |
48 | if (signal_pending(current)) { \ | |
49 | ret = -EINTR; \ | |
50 | break; \ | |
51 | } \ | |
52 | } \ | |
53 | __set_current_state(TASK_RUNNING); \ | |
54 | remove_wait_queue(&(queue), &entry); \ | |
55 | } while (0) |