Date: Fri, 18 Dec 2009 21:02:32 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r200690 - in stable/7/sys/boot: i386/zfsboot zfs Message-ID: <200912182102.nBIL2Wpr008642@svn.freebsd.org>
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Author: jhb Date: Fri Dec 18 21:02:32 2009 New Revision: 200690 URL: http://svn.freebsd.org/changeset/base/200690 Log: MFC 200309: - Port bios_getmem() from libi386 to {gpt,}zfsboot() and use it to safely allocate a heap region above 1MB. This enables {gpt,}zfsboot() to allocate much larger buffers than before. - Use a larger buffer (1MB instead of 128K) for temporary ZFS buffers. This allows more reliable reading of compressed files in a raidz/raidz2 pool. Modified: stable/7/sys/boot/i386/zfsboot/zfsboot.c stable/7/sys/boot/zfs/zfsimpl.c Directory Properties: stable/7/sys/ (props changed) stable/7/sys/cddl/contrib/opensolaris/ (props changed) stable/7/sys/contrib/dev/acpica/ (props changed) stable/7/sys/contrib/pf/ (props changed) Modified: stable/7/sys/boot/i386/zfsboot/zfsboot.c ============================================================================== --- stable/7/sys/boot/i386/zfsboot/zfsboot.c Fri Dec 18 21:01:56 2009 (r200689) +++ stable/7/sys/boot/i386/zfsboot/zfsboot.c Fri Dec 18 21:02:32 2009 (r200690) @@ -27,6 +27,7 @@ __FBSDID("$FreeBSD$"); #include <machine/bootinfo.h> #include <machine/elf.h> +#include <machine/pc/bios.h> #include <stdarg.h> #include <stddef.h> @@ -90,8 +91,6 @@ __FBSDID("$FreeBSD$"); #define ARGS 0x900 #define NOPT 14 #define NDEV 3 -#define MEM_BASE 0x12 -#define MEM_EXT 0x15 #define V86_CY(x) ((x) & 1) #define V86_ZR(x) ((x) & 0x40) @@ -149,6 +148,19 @@ static struct bootinfo bootinfo; static uint32_t bootdev; static uint8_t ioctrl = IO_KEYBOARD; +vm_offset_t high_heap_base; +uint32_t bios_basemem, bios_extmem, high_heap_size; + +static struct bios_smap smap; + +/* + * The minimum amount of memory to reserve in bios_extmem for the heap. + */ +#define HEAP_MIN (3 * 1024 * 1024) + +static char *heap_next; +static char *heap_end; + /* Buffers that must not span a 64k boundary. */ #define READ_BUF_SIZE 8192 struct dmadat { @@ -162,7 +174,7 @@ static void load(void); static int parse(void); static void printf(const char *,...); static void putchar(int); -static uint32_t memsize(void); +static void bios_getmem(void); static int drvread(struct dsk *, void *, daddr_t, unsigned); static int keyhit(unsigned); static int xputc(int); @@ -237,14 +249,6 @@ memset(void *p, char val, size_t n) static void * malloc(size_t n) { - static char *heap_next; - static char *heap_end; - - if (!heap_next) { - heap_next = (char *) dmadat + sizeof(*dmadat); - heap_end = (char *) (640*1024); - } - char *p = heap_next; if (p + n > heap_end) { printf("malloc failure\n"); @@ -344,14 +348,91 @@ xfsread(const dnode_phys_t *dnode, off_t return 0; } -static inline uint32_t -memsize(void) +static void +bios_getmem(void) { - v86.addr = MEM_EXT; - v86.eax = 0x8800; - v86int(); - return v86.eax; -} + uint64_t size; + + /* Parse system memory map */ + v86.ebx = 0; + do { + v86.ctl = V86_FLAGS; + v86.addr = 0x15; /* int 0x15 function 0xe820*/ + v86.eax = 0xe820; + v86.ecx = sizeof(struct bios_smap); + v86.edx = SMAP_SIG; + v86.es = VTOPSEG(&smap); + v86.edi = VTOPOFF(&smap); + v86int(); + if ((v86.efl & 1) || (v86.eax != SMAP_SIG)) + break; + /* look for a low-memory segment that's large enough */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0) && + (smap.length >= (512 * 1024))) + bios_basemem = smap.length; + /* look for the first segment in 'extended' memory */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base == 0x100000)) { + bios_extmem = smap.length; + } + + /* + * Look for the largest segment in 'extended' memory beyond + * 1MB but below 4GB. + */ + if ((smap.type == SMAP_TYPE_MEMORY) && (smap.base > 0x100000) && + (smap.base < 0x100000000ull)) { + size = smap.length; + + /* + * If this segment crosses the 4GB boundary, truncate it. + */ + if (smap.base + size > 0x100000000ull) + size = 0x100000000ull - smap.base; + + if (size > high_heap_size) { + high_heap_size = size; + high_heap_base = smap.base; + } + } + } while (v86.ebx != 0); + + /* Fall back to the old compatibility function for base memory */ + if (bios_basemem == 0) { + v86.ctl = 0; + v86.addr = 0x12; /* int 0x12 */ + v86int(); + + bios_basemem = (v86.eax & 0xffff) * 1024; + } + + /* Fall back through several compatibility functions for extended memory */ + if (bios_extmem == 0) { + v86.ctl = V86_FLAGS; + v86.addr = 0x15; /* int 0x15 function 0xe801*/ + v86.eax = 0xe801; + v86int(); + if (!(v86.efl & 1)) { + bios_extmem = ((v86.ecx & 0xffff) + ((v86.edx & 0xffff) * 64)) * 1024; + } + } + if (bios_extmem == 0) { + v86.ctl = 0; + v86.addr = 0x15; /* int 0x15 function 0x88*/ + v86.eax = 0x8800; + v86int(); + bios_extmem = (v86.eax & 0xffff) * 1024; + } + + /* + * If we have extended memory and did not find a suitable heap + * region in the SMAP, use the last 3MB of 'extended' memory as a + * high heap candidate. + */ + if (bios_extmem >= HEAP_MIN && high_heap_size < HEAP_MIN) { + high_heap_size = HEAP_MIN; + high_heap_base = bios_extmem + 0x100000 - HEAP_MIN; + } +} static inline void getstr(void) @@ -536,6 +617,16 @@ main(void) off_t off; struct dsk *dsk; + bios_getmem(); + + if (high_heap_size > 0) { + heap_end = PTOV(high_heap_base + high_heap_size); + heap_next = PTOV(high_heap_base); + } else { + heap_next = (char *) dmadat + sizeof(*dmadat); + heap_end = (char *) PTOV(bios_basemem); + } + dmadat = (void *)(roundup2(__base + (int32_t)&_end, 0x10000) - __base); v86.ctl = V86_FLAGS; @@ -550,8 +641,8 @@ main(void) bootinfo.bi_version = BOOTINFO_VERSION; bootinfo.bi_size = sizeof(bootinfo); - bootinfo.bi_basemem = 0; /* XXX will be filled by loader or kernel */ - bootinfo.bi_extmem = memsize(); + bootinfo.bi_basemem = bios_basemem / 1024; + bootinfo.bi_extmem = bios_extmem / 1024; bootinfo.bi_memsizes_valid++; bootinfo.bi_bios_dev = dsk->drive; Modified: stable/7/sys/boot/zfs/zfsimpl.c ============================================================================== --- stable/7/sys/boot/zfs/zfsimpl.c Fri Dec 18 21:01:56 2009 (r200689) +++ stable/7/sys/boot/zfs/zfsimpl.c Fri Dec 18 21:02:32 2009 (r200690) @@ -51,7 +51,7 @@ static char *dnode_cache_buf; static char *zap_scratch; static char *zfs_temp_buf, *zfs_temp_end, *zfs_temp_ptr; -#define TEMP_SIZE (1*SPA_MAXBLOCKSIZE) +#define TEMP_SIZE (1024 * 1024) static int zio_read(spa_t *spa, const blkptr_t *bp, void *buf);
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