1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /** 3 * \file drm_os_linux.h 4 * OS abstraction macros. 5 */ 6 7 #include <linux/interrupt.h> /* For task queue support */ 8 #include <linux/sched/signal.h> 9 #include <linux/delay.h> 10 #include <linux/io-64-nonatomic-lo-hi.h> 11 12 /** Current process ID */ 13 #define DRM_CURRENTPID task_pid_nr(current) 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)) 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 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) 56