Subversion Repositories planix.SVN

#include        "u.h"
#include        "lib.h"
#include        "dat.h"
#include        "fns.h"
#include        "error.h"

enum
{
        Hdrspc          = 64,           /* leave room for high-level headers */
        Bdead           = 0x51494F42,   /* "QIOB" */
};

struct
{
        Lock    lk;
        ulong   bytes;
} ialloc;

static Block*
_allocb(int size)
{
        Block *b;
        uintptr addr;

        if((b = mallocz(sizeof(Block)+size+Hdrspc, 0)) == nil)
                return nil;

        b->next = nil;
        b->list = nil;
        b->free = 0;
        b->flag = 0;

        /* align start of data portion by rounding up */
        addr = (uintptr)b;
        addr = ROUND(addr + sizeof(Block), BLOCKALIGN);
        b->base = (uchar*)addr;

        /* align end of data portion by rounding down */
        b->lim = ((uchar*)b) + sizeof(Block)+size+Hdrspc;
        addr = (uintptr)(b->lim);
        addr = addr & ~(BLOCKALIGN-1);
        b->lim = (uchar*)addr;

        /* leave sluff at beginning for added headers */
        b->rp = b->lim - ROUND(size, BLOCKALIGN);
        if(b->rp < b->base)
                panic("_allocb");
        b->wp = b->rp;

        return b;
}

Block*
allocb(int size)
{
        Block *b;

        /*
         * Check in a process and wait until successful.
         * Can still error out of here, though.
         */
        if(up == nil)
                panic("allocb without up: %p\n", getcallerpc(&size));
        if((b = _allocb(size)) == nil){
                panic("allocb: no memory for %d bytes\n", size);
        }
        setmalloctag(b, getcallerpc(&size));

        return b;
}

Block*
iallocb(int size)
{
        Block *b;
        static int m1, m2;

        if(ialloc.bytes > conf.ialloc){
                if((m1++%10000)==0)
                        print("iallocb: limited %lud/%lud\n",
                                ialloc.bytes, conf.ialloc);
                return 0;
        }

        if((b = _allocb(size)) == nil){
                if((m2++%10000)==0)
                        print("iallocb: no memory %lud/%lud\n",
                                ialloc.bytes, conf.ialloc);
                return nil;
        }
        setmalloctag(b, getcallerpc(&size));
        b->flag = BINTR;

        ilock(&ialloc.lk);
        ialloc.bytes += b->lim - b->base;
        iunlock(&ialloc.lk);

        return b;
}

void
freeb(Block *b)
{
        void *dead = (void*)Bdead;

        if(b == nil)
                return;

        /*
         * drivers which perform non cache coherent DMA manage their own buffer
         * pool of uncached buffers and provide their own free routine.
         */
        if(b->free) {
                b->free(b);
                return;
        }
        if(b->flag & BINTR) {
                ilock(&ialloc.lk);
                ialloc.bytes -= b->lim - b->base;
                iunlock(&ialloc.lk);
        }

        /* poison the block in case someone is still holding onto it */
        b->next = dead;
        b->rp = dead;
        b->wp = dead;
        b->lim = dead;
        b->base = dead;

        free(b);
}

void
checkb(Block *b, char *msg)
{
        void *dead = (void*)Bdead;

        if(b == dead)
                panic("checkb b %s %lux", msg, b);
        if(b->base == dead || b->lim == dead || b->next == dead
          || b->rp == dead || b->wp == dead){
                print("checkb: base 0x%8.8luX lim 0x%8.8luX next 0x%8.8luX\n",
                        b->base, b->lim, b->next);
                print("checkb: rp 0x%8.8luX wp 0x%8.8luX\n", b->rp, b->wp);
                panic("checkb dead: %s\n", msg);
        }

        if(b->base > b->lim)
                panic("checkb 0 %s %lux %lux", msg, b->base, b->lim);
        if(b->rp < b->base)
                panic("checkb 1 %s %lux %lux", msg, b->base, b->rp);
        if(b->wp < b->base)
                panic("checkb 2 %s %lux %lux", msg, b->base, b->wp);
        if(b->rp > b->lim)
                panic("checkb 3 %s %lux %lux", msg, b->rp, b->lim);
        if(b->wp > b->lim)
                panic("checkb 4 %s %lux %lux", msg, b->wp, b->lim);

}

void
iallocsummary(void)
{
        print("ialloc %lud/%lud\n", ialloc.bytes, conf.ialloc);
}