forked from KolibriOS/kolibrios
978 lines
28 KiB
C
978 lines
28 KiB
C
#include <ddk.h>
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#include <linux/mm.h>
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#include <drm/drmP.h>
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#include <linux/hdmi.h>
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#include "radeon.h"
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int x86_clflush_size;
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unsigned int tsc_khz;
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struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags)
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{
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struct file *filep;
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int count;
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filep = __builtin_malloc(sizeof(*filep));
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if(unlikely(filep == NULL))
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return ERR_PTR(-ENOMEM);
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count = size / PAGE_SIZE;
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filep->pages = kzalloc(sizeof(struct page *) * count, 0);
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if(unlikely(filep->pages == NULL))
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{
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kfree(filep);
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return ERR_PTR(-ENOMEM);
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};
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filep->count = count;
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filep->allocated = 0;
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filep->vma = NULL;
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// printf("%s file %p pages %p count %d\n",
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// __FUNCTION__,filep, filep->pages, count);
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return filep;
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}
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static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes)
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{
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while (bytes) {
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if (*start != value)
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return (void *)start;
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start++;
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bytes--;
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}
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return NULL;
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}
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/**
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* memchr_inv - Find an unmatching character in an area of memory.
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* @start: The memory area
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* @c: Find a character other than c
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* @bytes: The size of the area.
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*
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* returns the address of the first character other than @c, or %NULL
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* if the whole buffer contains just @c.
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*/
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void *memchr_inv(const void *start, int c, size_t bytes)
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{
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u8 value = c;
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u64 value64;
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unsigned int words, prefix;
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if (bytes <= 16)
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return check_bytes8(start, value, bytes);
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value64 = value;
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#if defined(ARCH_HAS_FAST_MULTIPLIER) && BITS_PER_LONG == 64
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value64 *= 0x0101010101010101;
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#elif defined(ARCH_HAS_FAST_MULTIPLIER)
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value64 *= 0x01010101;
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value64 |= value64 << 32;
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#else
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value64 |= value64 << 8;
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value64 |= value64 << 16;
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value64 |= value64 << 32;
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#endif
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prefix = (unsigned long)start % 8;
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if (prefix) {
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u8 *r;
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prefix = 8 - prefix;
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r = check_bytes8(start, value, prefix);
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if (r)
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return r;
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start += prefix;
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bytes -= prefix;
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}
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words = bytes / 8;
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while (words) {
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if (*(u64 *)start != value64)
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return check_bytes8(start, value, 8);
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start += 8;
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words--;
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}
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return check_bytes8(start, value, bytes % 8);
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}
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#define _U 0x01 /* upper */
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#define _L 0x02 /* lower */
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#define _D 0x04 /* digit */
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#define _C 0x08 /* cntrl */
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#define _P 0x10 /* punct */
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#define _S 0x20 /* white space (space/lf/tab) */
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#define _X 0x40 /* hex digit */
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#define _SP 0x80 /* hard space (0x20) */
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extern const unsigned char _ctype[];
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#define __ismask(x) (_ctype[(int)(unsigned char)(x)])
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#define isalnum(c) ((__ismask(c)&(_U|_L|_D)) != 0)
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#define isalpha(c) ((__ismask(c)&(_U|_L)) != 0)
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#define iscntrl(c) ((__ismask(c)&(_C)) != 0)
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#define isdigit(c) ((__ismask(c)&(_D)) != 0)
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#define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0)
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#define islower(c) ((__ismask(c)&(_L)) != 0)
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#define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
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#define ispunct(c) ((__ismask(c)&(_P)) != 0)
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/* Note: isspace() must return false for %NUL-terminator */
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#define isspace(c) ((__ismask(c)&(_S)) != 0)
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#define isupper(c) ((__ismask(c)&(_U)) != 0)
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#define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
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#define isascii(c) (((unsigned char)(c))<=0x7f)
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#define toascii(c) (((unsigned char)(c))&0x7f)
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static inline unsigned char __tolower(unsigned char c)
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{
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if (isupper(c))
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c -= 'A'-'a';
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return c;
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}
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static inline unsigned char __toupper(unsigned char c)
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{
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if (islower(c))
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c -= 'a'-'A';
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return c;
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}
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#define tolower(c) __tolower(c)
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#define toupper(c) __toupper(c)
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/*
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* Fast implementation of tolower() for internal usage. Do not use in your
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* code.
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*/
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static inline char _tolower(const char c)
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{
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return c | 0x20;
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}
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//const char hex_asc[] = "0123456789abcdef";
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/**
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* hex_to_bin - convert a hex digit to its real value
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* @ch: ascii character represents hex digit
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*
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* hex_to_bin() converts one hex digit to its actual value or -1 in case of bad
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* input.
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*/
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int hex_to_bin(char ch)
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{
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if ((ch >= '0') && (ch <= '9'))
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return ch - '0';
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ch = tolower(ch);
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if ((ch >= 'a') && (ch <= 'f'))
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return ch - 'a' + 10;
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return -1;
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}
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EXPORT_SYMBOL(hex_to_bin);
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/**
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* hex2bin - convert an ascii hexadecimal string to its binary representation
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* @dst: binary result
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* @src: ascii hexadecimal string
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* @count: result length
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*
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* Return 0 on success, -1 in case of bad input.
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*/
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int hex2bin(u8 *dst, const char *src, size_t count)
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{
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while (count--) {
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int hi = hex_to_bin(*src++);
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int lo = hex_to_bin(*src++);
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if ((hi < 0) || (lo < 0))
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return -1;
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*dst++ = (hi << 4) | lo;
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}
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return 0;
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}
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EXPORT_SYMBOL(hex2bin);
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/**
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* hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
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* @buf: data blob to dump
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* @len: number of bytes in the @buf
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* @rowsize: number of bytes to print per line; must be 16 or 32
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* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
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* @linebuf: where to put the converted data
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* @linebuflen: total size of @linebuf, including space for terminating NUL
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* @ascii: include ASCII after the hex output
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*
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* hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
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* 16 or 32 bytes of input data converted to hex + ASCII output.
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*
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* Given a buffer of u8 data, hex_dump_to_buffer() converts the input data
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* to a hex + ASCII dump at the supplied memory location.
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* The converted output is always NUL-terminated.
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*
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* E.g.:
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* hex_dump_to_buffer(frame->data, frame->len, 16, 1,
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* linebuf, sizeof(linebuf), true);
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*
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* example output buffer:
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* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
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*/
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void hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
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int groupsize, char *linebuf, size_t linebuflen,
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bool ascii)
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{
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const u8 *ptr = buf;
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u8 ch;
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int j, lx = 0;
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int ascii_column;
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if (rowsize != 16 && rowsize != 32)
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rowsize = 16;
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if (!len)
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goto nil;
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if (len > rowsize) /* limit to one line at a time */
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len = rowsize;
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if ((len % groupsize) != 0) /* no mixed size output */
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groupsize = 1;
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switch (groupsize) {
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case 8: {
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const u64 *ptr8 = buf;
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int ngroups = len / groupsize;
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for (j = 0; j < ngroups; j++)
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lx += scnprintf(linebuf + lx, linebuflen - lx,
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"%s%16.16llx", j ? " " : "",
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(unsigned long long)*(ptr8 + j));
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ascii_column = 17 * ngroups + 2;
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break;
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}
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case 4: {
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const u32 *ptr4 = buf;
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int ngroups = len / groupsize;
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for (j = 0; j < ngroups; j++)
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lx += scnprintf(linebuf + lx, linebuflen - lx,
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"%s%8.8x", j ? " " : "", *(ptr4 + j));
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ascii_column = 9 * ngroups + 2;
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break;
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}
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case 2: {
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const u16 *ptr2 = buf;
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int ngroups = len / groupsize;
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for (j = 0; j < ngroups; j++)
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lx += scnprintf(linebuf + lx, linebuflen - lx,
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"%s%4.4x", j ? " " : "", *(ptr2 + j));
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ascii_column = 5 * ngroups + 2;
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break;
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}
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default:
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for (j = 0; (j < len) && (lx + 3) <= linebuflen; j++) {
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ch = ptr[j];
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linebuf[lx++] = hex_asc_hi(ch);
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linebuf[lx++] = hex_asc_lo(ch);
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linebuf[lx++] = ' ';
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}
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if (j)
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lx--;
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ascii_column = 3 * rowsize + 2;
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break;
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}
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if (!ascii)
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goto nil;
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while (lx < (linebuflen - 1) && lx < (ascii_column - 1))
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linebuf[lx++] = ' ';
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for (j = 0; (j < len) && (lx + 2) < linebuflen; j++) {
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ch = ptr[j];
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linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
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}
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nil:
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linebuf[lx++] = '\0';
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}
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/**
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* print_hex_dump - print a text hex dump to syslog for a binary blob of data
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* @level: kernel log level (e.g. KERN_DEBUG)
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* @prefix_str: string to prefix each line with;
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* caller supplies trailing spaces for alignment if desired
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* @prefix_type: controls whether prefix of an offset, address, or none
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* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
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* @rowsize: number of bytes to print per line; must be 16 or 32
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* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
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* @buf: data blob to dump
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* @len: number of bytes in the @buf
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* @ascii: include ASCII after the hex output
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*
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* Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump
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* to the kernel log at the specified kernel log level, with an optional
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* leading prefix.
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*
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* print_hex_dump() works on one "line" of output at a time, i.e.,
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* 16 or 32 bytes of input data converted to hex + ASCII output.
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* print_hex_dump() iterates over the entire input @buf, breaking it into
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* "line size" chunks to format and print.
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*
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* E.g.:
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* print_hex_dump(KERN_DEBUG, "raw data: ", DUMP_PREFIX_ADDRESS,
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* 16, 1, frame->data, frame->len, true);
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*
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* Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
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* 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
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* Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
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* ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~.
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*/
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void print_hex_dump(const char *level, const char *prefix_str, int prefix_type,
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int rowsize, int groupsize,
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const void *buf, size_t len, bool ascii)
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{
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const u8 *ptr = buf;
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int i, linelen, remaining = len;
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unsigned char linebuf[32 * 3 + 2 + 32 + 1];
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if (rowsize != 16 && rowsize != 32)
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rowsize = 16;
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for (i = 0; i < len; i += rowsize) {
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linelen = min(remaining, rowsize);
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remaining -= rowsize;
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hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
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linebuf, sizeof(linebuf), ascii);
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switch (prefix_type) {
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case DUMP_PREFIX_ADDRESS:
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printk("%s%s%p: %s\n",
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level, prefix_str, ptr + i, linebuf);
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break;
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case DUMP_PREFIX_OFFSET:
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printk("%s%s%.8x: %s\n", level, prefix_str, i, linebuf);
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break;
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default:
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printk("%s%s%s\n", level, prefix_str, linebuf);
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break;
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}
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}
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}
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void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
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const void *buf, size_t len)
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{
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print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, 16, 1,
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buf, len, true);
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}
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void msleep(unsigned int msecs)
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{
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msecs /= 10;
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if(!msecs) msecs = 1;
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__asm__ __volatile__ (
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"call *__imp__Delay"
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::"b" (msecs));
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__asm__ __volatile__ (
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"":::"ebx");
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};
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/* simple loop based delay: */
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static void delay_loop(unsigned long loops)
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{
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asm volatile(
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" test %0,%0 \n"
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" jz 3f \n"
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" jmp 1f \n"
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".align 16 \n"
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"1: jmp 2f \n"
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".align 16 \n"
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"2: dec %0 \n"
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" jnz 2b \n"
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"3: dec %0 \n"
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: /* we don't need output */
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:"a" (loops)
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);
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}
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static void (*delay_fn)(unsigned long) = delay_loop;
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void __delay(unsigned long loops)
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{
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delay_fn(loops);
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}
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inline void __const_udelay(unsigned long xloops)
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{
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int d0;
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xloops *= 4;
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asm("mull %%edx"
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: "=d" (xloops), "=&a" (d0)
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: "1" (xloops), ""
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(loops_per_jiffy * (HZ/4)));
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__delay(++xloops);
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}
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void __udelay(unsigned long usecs)
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{
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__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
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}
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unsigned int _sw_hweight32(unsigned int w)
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{
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#ifdef CONFIG_ARCH_HAS_FAST_MULTIPLIER
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w -= (w >> 1) & 0x55555555;
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w = (w & 0x33333333) + ((w >> 2) & 0x33333333);
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w = (w + (w >> 4)) & 0x0f0f0f0f;
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return (w * 0x01010101) >> 24;
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#else
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unsigned int res = w - ((w >> 1) & 0x55555555);
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res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
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res = (res + (res >> 4)) & 0x0F0F0F0F;
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res = res + (res >> 8);
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return (res + (res >> 16)) & 0x000000FF;
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#endif
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}
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EXPORT_SYMBOL(_sw_hweight32);
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void usleep_range(unsigned long min, unsigned long max)
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{
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udelay(max);
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}
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EXPORT_SYMBOL(usleep_range);
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void *kmemdup(const void *src, size_t len, gfp_t gfp)
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{
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void *p;
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p = kmalloc(len, gfp);
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if (p)
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memcpy(p, src, len);
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return p;
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}
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void cpu_detect1()
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{
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u32 junk, tfms, cap0, misc;
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int i;
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cpuid(0x00000001, &tfms, &misc, &junk, &cap0);
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if (cap0 & (1<<19))
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{
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x86_clflush_size = ((misc >> 8) & 0xff) * 8;
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}
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#if 0
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cpuid(0x80000002, (unsigned int*)&cpuinfo.model_name[0], (unsigned int*)&cpuinfo.model_name[4],
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(unsigned int*)&cpuinfo.model_name[8], (unsigned int*)&cpuinfo.model_name[12]);
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cpuid(0x80000003, (unsigned int*)&cpuinfo.model_name[16], (unsigned int*)&cpuinfo.model_name[20],
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(unsigned int*)&cpuinfo.model_name[24], (unsigned int*)&cpuinfo.model_name[28]);
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cpuid(0x80000004, (unsigned int*)&cpuinfo.model_name[32], (unsigned int*)&cpuinfo.model_name[36],
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(unsigned int*)&cpuinfo.model_name[40], (unsigned int*)&cpuinfo.model_name[44]);
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printf("\n%s\n\n",cpuinfo.model_name);
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cpuinfo.def_mtrr = read_msr(MSR_MTRRdefType);
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cpuinfo.mtrr_cap = read_msr(IA32_MTRRCAP);
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printf("MSR_MTRRdefType %016llx\n\n", cpuinfo.def_mtrr);
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cpuinfo.var_mtrr_count = (u8_t)cpuinfo.mtrr_cap;
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for(i = 0; i < cpuinfo.var_mtrr_count; i++)
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{
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u64_t mtrr_base;
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u64_t mtrr_mask;
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|
|
cpuinfo.var_mtrr[i].base = read_msr(MTRRphysBase_MSR(i));
|
|
cpuinfo.var_mtrr[i].mask = read_msr(MTRRphysMask_MSR(i));
|
|
|
|
printf("MTRR_%d base: %016llx mask: %016llx\n", i,
|
|
cpuinfo.var_mtrr[i].base,
|
|
cpuinfo.var_mtrr[i].mask);
|
|
};
|
|
|
|
unsigned int cr0, cr3, cr4, eflags;
|
|
|
|
eflags = safe_cli();
|
|
|
|
/* Enter the no-fill (CD=1, NW=0) cache mode and flush caches. */
|
|
cr0 = read_cr0() | (1<<30);
|
|
write_cr0(cr0);
|
|
wbinvd();
|
|
|
|
cr4 = read_cr4();
|
|
write_cr4(cr4 & ~(1<<7));
|
|
|
|
cr3 = read_cr3();
|
|
write_cr3(cr3);
|
|
|
|
/* Save MTRR state */
|
|
rdmsr(MSR_MTRRdefType, deftype_lo, deftype_hi);
|
|
|
|
/* Disable MTRRs, and set the default type to uncached */
|
|
native_write_msr(MSR_MTRRdefType, deftype_lo & ~0xcff, deftype_hi);
|
|
wbinvd();
|
|
|
|
i = 0;
|
|
set_mtrr(i++,0,0x80000000>>12,MTRR_WB);
|
|
set_mtrr(i++,0x80000000>>12,0x40000000>>12,MTRR_WB);
|
|
set_mtrr(i++,0xC0000000>>12,0x20000000>>12,MTRR_WB);
|
|
set_mtrr(i++,0xdb800000>>12,0x00800000>>12,MTRR_UC);
|
|
set_mtrr(i++,0xdc000000>>12,0x04000000>>12,MTRR_UC);
|
|
set_mtrr(i++,0xE0000000>>12,0x10000000>>12,MTRR_WC);
|
|
|
|
for(; i < cpuinfo.var_mtrr_count; i++)
|
|
set_mtrr(i,0,0,0);
|
|
|
|
write_cr3(cr3);
|
|
|
|
/* Intel (P6) standard MTRRs */
|
|
native_write_msr(MSR_MTRRdefType, deftype_lo, deftype_hi);
|
|
|
|
/* Enable caches */
|
|
write_cr0(read_cr0() & ~(1<<30));
|
|
|
|
/* Restore value of CR4 */
|
|
write_cr4(cr4);
|
|
|
|
safe_sti(eflags);
|
|
|
|
printf("\nnew MTRR map\n\n");
|
|
|
|
for(i = 0; i < cpuinfo.var_mtrr_count; i++)
|
|
{
|
|
u64_t mtrr_base;
|
|
u64_t mtrr_mask;
|
|
|
|
cpuinfo.var_mtrr[i].base = read_msr(MTRRphysBase_MSR(i));
|
|
cpuinfo.var_mtrr[i].mask = read_msr(MTRRphysMask_MSR(i));
|
|
|
|
printf("MTRR_%d base: %016llx mask: %016llx\n", i,
|
|
cpuinfo.var_mtrr[i].base,
|
|
cpuinfo.var_mtrr[i].mask);
|
|
};
|
|
#endif
|
|
|
|
tsc_khz = (unsigned int)(GetCpuFreq()/1000);
|
|
}
|
|
|
|
|
|
static atomic_t fence_context_counter = ATOMIC_INIT(0);
|
|
|
|
/**
|
|
* fence_context_alloc - allocate an array of fence contexts
|
|
* @num: [in] amount of contexts to allocate
|
|
*
|
|
* This function will return the first index of the number of fences allocated.
|
|
* The fence context is used for setting fence->context to a unique number.
|
|
*/
|
|
unsigned fence_context_alloc(unsigned num)
|
|
{
|
|
BUG_ON(!num);
|
|
return atomic_add_return(num, &fence_context_counter) - num;
|
|
}
|
|
EXPORT_SYMBOL(fence_context_alloc);
|
|
|
|
|
|
int fence_signal(struct fence *fence)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!fence)
|
|
return -EINVAL;
|
|
|
|
// if (!ktime_to_ns(fence->timestamp)) {
|
|
// fence->timestamp = ktime_get();
|
|
// smp_mb__before_atomic();
|
|
// }
|
|
|
|
if (test_and_set_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags))
|
|
return -EINVAL;
|
|
|
|
// trace_fence_signaled(fence);
|
|
|
|
if (test_bit(FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags)) {
|
|
struct fence_cb *cur, *tmp;
|
|
|
|
spin_lock_irqsave(fence->lock, flags);
|
|
list_for_each_entry_safe(cur, tmp, &fence->cb_list, node) {
|
|
list_del_init(&cur->node);
|
|
cur->func(fence, cur);
|
|
}
|
|
spin_unlock_irqrestore(fence->lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fence_signal);
|
|
|
|
int fence_signal_locked(struct fence *fence)
|
|
{
|
|
struct fence_cb *cur, *tmp;
|
|
int ret = 0;
|
|
|
|
if (WARN_ON(!fence))
|
|
return -EINVAL;
|
|
|
|
// if (!ktime_to_ns(fence->timestamp)) {
|
|
// fence->timestamp = ktime_get();
|
|
// smp_mb__before_atomic();
|
|
// }
|
|
|
|
if (test_and_set_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
|
|
ret = -EINVAL;
|
|
|
|
/*
|
|
* we might have raced with the unlocked fence_signal,
|
|
* still run through all callbacks
|
|
*/
|
|
}// else
|
|
// trace_fence_signaled(fence);
|
|
|
|
list_for_each_entry_safe(cur, tmp, &fence->cb_list, node) {
|
|
list_del_init(&cur->node);
|
|
cur->func(fence, cur);
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fence_signal_locked);
|
|
|
|
|
|
void fence_enable_sw_signaling(struct fence *fence)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!test_and_set_bit(FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags) &&
|
|
!test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
|
|
// trace_fence_enable_signal(fence);
|
|
|
|
spin_lock_irqsave(fence->lock, flags);
|
|
|
|
if (!fence->ops->enable_signaling(fence))
|
|
fence_signal_locked(fence);
|
|
|
|
spin_unlock_irqrestore(fence->lock, flags);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(fence_enable_sw_signaling);
|
|
|
|
|
|
|
|
signed long
|
|
fence_wait_timeout(struct fence *fence, bool intr, signed long timeout)
|
|
{
|
|
signed long ret;
|
|
|
|
if (WARN_ON(timeout < 0))
|
|
return -EINVAL;
|
|
|
|
// trace_fence_wait_start(fence);
|
|
ret = fence->ops->wait(fence, intr, timeout);
|
|
// trace_fence_wait_end(fence);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(fence_wait_timeout);
|
|
|
|
void fence_release(struct kref *kref)
|
|
{
|
|
struct fence *fence =
|
|
container_of(kref, struct fence, refcount);
|
|
|
|
// trace_fence_destroy(fence);
|
|
|
|
BUG_ON(!list_empty(&fence->cb_list));
|
|
|
|
if (fence->ops->release)
|
|
fence->ops->release(fence);
|
|
else
|
|
fence_free(fence);
|
|
}
|
|
EXPORT_SYMBOL(fence_release);
|
|
|
|
void fence_free(struct fence *fence)
|
|
{
|
|
kfree_rcu(fence, rcu);
|
|
}
|
|
EXPORT_SYMBOL(fence_free);
|
|
|
|
|
|
reservation_object_add_shared_inplace(struct reservation_object *obj,
|
|
struct reservation_object_list *fobj,
|
|
struct fence *fence)
|
|
{
|
|
u32 i;
|
|
|
|
fence_get(fence);
|
|
|
|
// preempt_disable();
|
|
write_seqcount_begin(&obj->seq);
|
|
|
|
for (i = 0; i < fobj->shared_count; ++i) {
|
|
struct fence *old_fence;
|
|
|
|
old_fence = rcu_dereference_protected(fobj->shared[i],
|
|
reservation_object_held(obj));
|
|
|
|
if (old_fence->context == fence->context) {
|
|
/* memory barrier is added by write_seqcount_begin */
|
|
RCU_INIT_POINTER(fobj->shared[i], fence);
|
|
write_seqcount_end(&obj->seq);
|
|
preempt_enable();
|
|
|
|
fence_put(old_fence);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* memory barrier is added by write_seqcount_begin,
|
|
* fobj->shared_count is protected by this lock too
|
|
*/
|
|
RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
|
|
fobj->shared_count++;
|
|
|
|
write_seqcount_end(&obj->seq);
|
|
// preempt_enable();
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
reservation_object_add_shared_replace(struct reservation_object *obj,
|
|
struct reservation_object_list *old,
|
|
struct reservation_object_list *fobj,
|
|
struct fence *fence)
|
|
{
|
|
unsigned i;
|
|
struct fence *old_fence = NULL;
|
|
|
|
fence_get(fence);
|
|
|
|
if (!old) {
|
|
RCU_INIT_POINTER(fobj->shared[0], fence);
|
|
fobj->shared_count = 1;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* no need to bump fence refcounts, rcu_read access
|
|
* requires the use of kref_get_unless_zero, and the
|
|
* references from the old struct are carried over to
|
|
* the new.
|
|
*/
|
|
fobj->shared_count = old->shared_count;
|
|
|
|
for (i = 0; i < old->shared_count; ++i) {
|
|
struct fence *check;
|
|
|
|
check = rcu_dereference_protected(old->shared[i],
|
|
reservation_object_held(obj));
|
|
|
|
if (!old_fence && check->context == fence->context) {
|
|
old_fence = check;
|
|
RCU_INIT_POINTER(fobj->shared[i], fence);
|
|
} else
|
|
RCU_INIT_POINTER(fobj->shared[i], check);
|
|
}
|
|
if (!old_fence) {
|
|
RCU_INIT_POINTER(fobj->shared[fobj->shared_count], fence);
|
|
fobj->shared_count++;
|
|
}
|
|
|
|
done:
|
|
// preempt_disable();
|
|
write_seqcount_begin(&obj->seq);
|
|
/*
|
|
* RCU_INIT_POINTER can be used here,
|
|
* seqcount provides the necessary barriers
|
|
*/
|
|
RCU_INIT_POINTER(obj->fence, fobj);
|
|
write_seqcount_end(&obj->seq);
|
|
// preempt_enable();
|
|
|
|
if (old)
|
|
kfree_rcu(old, rcu);
|
|
|
|
if (old_fence)
|
|
fence_put(old_fence);
|
|
}
|
|
|
|
|
|
int reservation_object_reserve_shared(struct reservation_object *obj)
|
|
{
|
|
struct reservation_object_list *fobj, *old;
|
|
u32 max;
|
|
|
|
old = reservation_object_get_list(obj);
|
|
|
|
if (old && old->shared_max) {
|
|
if (old->shared_count < old->shared_max) {
|
|
/* perform an in-place update */
|
|
kfree(obj->staged);
|
|
obj->staged = NULL;
|
|
return 0;
|
|
} else
|
|
max = old->shared_max * 2;
|
|
} else
|
|
max = 4;
|
|
|
|
/*
|
|
* resize obj->staged or allocate if it doesn't exist,
|
|
* noop if already correct size
|
|
*/
|
|
fobj = krealloc(obj->staged, offsetof(typeof(*fobj), shared[max]),
|
|
GFP_KERNEL);
|
|
if (!fobj)
|
|
return -ENOMEM;
|
|
|
|
obj->staged = fobj;
|
|
fobj->shared_max = max;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(reservation_object_reserve_shared);
|
|
|
|
void reservation_object_add_shared_fence(struct reservation_object *obj,
|
|
struct fence *fence)
|
|
{
|
|
struct reservation_object_list *old, *fobj = obj->staged;
|
|
|
|
old = reservation_object_get_list(obj);
|
|
obj->staged = NULL;
|
|
|
|
if (!fobj) {
|
|
BUG_ON(old->shared_count >= old->shared_max);
|
|
reservation_object_add_shared_inplace(obj, old, fence);
|
|
} else
|
|
reservation_object_add_shared_replace(obj, old, fobj, fence);
|
|
}
|
|
EXPORT_SYMBOL(reservation_object_add_shared_fence);
|
|
|
|
|
|
void reservation_object_add_excl_fence(struct reservation_object *obj,
|
|
struct fence *fence)
|
|
{
|
|
struct fence *old_fence = reservation_object_get_excl(obj);
|
|
struct reservation_object_list *old;
|
|
u32 i = 0;
|
|
|
|
old = reservation_object_get_list(obj);
|
|
if (old)
|
|
i = old->shared_count;
|
|
|
|
if (fence)
|
|
fence_get(fence);
|
|
|
|
// preempt_disable();
|
|
write_seqcount_begin(&obj->seq);
|
|
/* write_seqcount_begin provides the necessary memory barrier */
|
|
RCU_INIT_POINTER(obj->fence_excl, fence);
|
|
if (old)
|
|
old->shared_count = 0;
|
|
write_seqcount_end(&obj->seq);
|
|
// preempt_enable();
|
|
|
|
/* inplace update, no shared fences */
|
|
while (i--)
|
|
fence_put(rcu_dereference_protected(old->shared[i],
|
|
reservation_object_held(obj)));
|
|
|
|
if (old_fence)
|
|
fence_put(old_fence);
|
|
}
|
|
EXPORT_SYMBOL(reservation_object_add_excl_fence);
|
|
|
|
void
|
|
fence_init(struct fence *fence, const struct fence_ops *ops,
|
|
spinlock_t *lock, unsigned context, unsigned seqno)
|
|
{
|
|
BUG_ON(!lock);
|
|
BUG_ON(!ops || !ops->wait || !ops->enable_signaling ||
|
|
!ops->get_driver_name || !ops->get_timeline_name);
|
|
|
|
kref_init(&fence->refcount);
|
|
fence->ops = ops;
|
|
INIT_LIST_HEAD(&fence->cb_list);
|
|
fence->lock = lock;
|
|
fence->context = context;
|
|
fence->seqno = seqno;
|
|
fence->flags = 0UL;
|
|
|
|
// trace_fence_init(fence);
|
|
}
|
|
EXPORT_SYMBOL(fence_init);
|
|
|
|
|
|
#include <linux/rcupdate.h>
|
|
|
|
struct rcu_ctrlblk {
|
|
struct rcu_head *rcucblist; /* List of pending callbacks (CBs). */
|
|
struct rcu_head **donetail; /* ->next pointer of last "done" CB. */
|
|
struct rcu_head **curtail; /* ->next pointer of last CB. */
|
|
// RCU_TRACE(long qlen); /* Number of pending CBs. */
|
|
// RCU_TRACE(unsigned long gp_start); /* Start time for stalls. */
|
|
// RCU_TRACE(unsigned long ticks_this_gp); /* Statistic for stalls. */
|
|
// RCU_TRACE(unsigned long jiffies_stall); /* Jiffies at next stall. */
|
|
// RCU_TRACE(const char *name); /* Name of RCU type. */
|
|
};
|
|
|
|
/* Definition for rcupdate control block. */
|
|
static struct rcu_ctrlblk rcu_sched_ctrlblk = {
|
|
.donetail = &rcu_sched_ctrlblk.rcucblist,
|
|
.curtail = &rcu_sched_ctrlblk.rcucblist,
|
|
// RCU_TRACE(.name = "rcu_sched")
|
|
};
|
|
|
|
static void __call_rcu(struct rcu_head *head,
|
|
void (*func)(struct rcu_head *rcu),
|
|
struct rcu_ctrlblk *rcp)
|
|
{
|
|
unsigned long flags;
|
|
|
|
// debug_rcu_head_queue(head);
|
|
head->func = func;
|
|
head->next = NULL;
|
|
|
|
local_irq_save(flags);
|
|
*rcp->curtail = head;
|
|
rcp->curtail = &head->next;
|
|
// RCU_TRACE(rcp->qlen++);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* Post an RCU callback to be invoked after the end of an RCU-sched grace
|
|
* period. But since we have but one CPU, that would be after any
|
|
* quiescent state.
|
|
*/
|
|
void call_rcu_sched(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
|
|
{
|
|
__call_rcu(head, func, &rcu_sched_ctrlblk);
|
|
}
|
|
|
|
|