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Improve r238673 to additionally allow for odd-aligned buffers as

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passed in by smartd of smartmontools.
While at it, hint the compiler that 32-bit PIO is the most likely
case (idea from Linux) and use bus_{read,write}_stream_2(9) instead
of bus_{read,write}_multi_stream_2(9) for single count reads/writes.

MFC after:	1 week
This commit is contained in:
Marius Strobl 2013-02-02 21:57:06 +00:00
parent 96acb2c4fa
commit ba514351d1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=246257
2 changed files with 49 additions and 10 deletions
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10
sys/dev/ata/ata-all.h
View File

@ -698,6 +698,8 @@ MALLOC_DECLARE(M_ATA);
#define ATA_INW(res, offset) \
bus_read_2((res), (offset))
#define ATA_INW_STRM(res, offset) \
bus_read_stream_2((res), (offset))
#define ATA_INL(res, offset) \
bus_read_4((res), (offset))
#define ATA_INSW(res, offset, addr, count) \
@ -712,6 +714,8 @@ MALLOC_DECLARE(M_ATA);
bus_write_1((res), (offset), (value))
#define ATA_OUTW(res, offset, value) \
bus_write_2((res), (offset), (value))
#define ATA_OUTW_STRM(res, offset, value) \
bus_write_stream_2((res), (offset), (value))
#define ATA_OUTL(res, offset, value) \
bus_write_4((res), (offset), (value))
#define ATA_OUTSW(res, offset, addr, count) \
@ -729,6 +733,9 @@ MALLOC_DECLARE(M_ATA);
#define ATA_IDX_INW(ch, idx) \
ATA_INW(ch->r_io[idx].res, ch->r_io[idx].offset)
#define ATA_IDX_INW_STRM(ch, idx) \
ATA_INW_STRM(ch->r_io[idx].res, ch->r_io[idx].offset)
#define ATA_IDX_INL(ch, idx) \
ATA_INL(ch->r_io[idx].res, ch->r_io[idx].offset)
@ -750,6 +757,9 @@ MALLOC_DECLARE(M_ATA);
#define ATA_IDX_OUTW(ch, idx, value) \
ATA_OUTW(ch->r_io[idx].res, ch->r_io[idx].offset, value)
#define ATA_IDX_OUTW_STRM(ch, idx, value) \
ATA_OUTW_STRM(ch->r_io[idx].res, ch->r_io[idx].offset, value)
#define ATA_IDX_OUTL(ch, idx, value) \
ATA_OUTL(ch->r_io[idx].res, ch->r_io[idx].offset, value)

49
sys/dev/ata/ata-lowlevel.c
View File

@ -846,14 +846,28 @@ ata_pio_read(struct ata_request *request, int length)
uint8_t *addr;
int size = min(request->transfersize, length);
int resid;
uint8_t buf[2];
uint8_t buf[2] __aligned(sizeof(int16_t));
#ifndef __NO_STRICT_ALIGNMENT
int i;
#endif
addr = (uint8_t *)request->data + request->donecount;
if (ch->flags & ATA_USE_16BIT || (size % sizeof(int32_t)) ||
((uintptr_t)addr % sizeof(int32_t))) {
ATA_IDX_INSW_STRM(ch, ATA_DATA, (void*)addr, size / sizeof(int16_t));
if (__predict_false(ch->flags & ATA_USE_16BIT ||
(size % sizeof(int32_t)) || ((uintptr_t)addr % sizeof(int32_t)))) {
#ifndef __NO_STRICT_ALIGNMENT
if (__predict_false((uintptr_t)addr % sizeof(int16_t))) {
for (i = 0, resid = size & ~1; resid > 0; resid -=
sizeof(int16_t)) {
*(uint16_t *)&buf = ATA_IDX_INW_STRM(ch, ATA_DATA);
addr[i++] = buf[0];
addr[i++] = buf[1];
}
} else
#endif
ATA_IDX_INSW_STRM(ch, ATA_DATA, (void*)addr, size /
sizeof(int16_t));
if (size & 1) {
ATA_IDX_INSW_STRM(ch, ATA_DATA, (void*)buf, 1);
*(uint16_t *)&buf = ATA_IDX_INW_STRM(ch, ATA_DATA);
(addr + (size & ~1))[0] = buf[0];
}
} else
@ -875,15 +889,30 @@ ata_pio_write(struct ata_request *request, int length)
uint8_t *addr;
int size = min(request->transfersize, length);
int resid;
uint8_t buf[2];
uint8_t buf[2] __aligned(sizeof(int16_t));
#ifndef __NO_STRICT_ALIGNMENT
int i;
#endif
size = min(request->transfersize, length);
addr = (uint8_t *)request->data + request->donecount;
if (ch->flags & ATA_USE_16BIT || (size % sizeof(int32_t)) ||
((uintptr_t)addr % sizeof(int32_t))) {
ATA_IDX_OUTSW_STRM(ch, ATA_DATA, (void*)addr, size / sizeof(int16_t));
if (__predict_false(ch->flags & ATA_USE_16BIT ||
(size % sizeof(int32_t)) || ((uintptr_t)addr % sizeof(int32_t)))) {
#ifndef __NO_STRICT_ALIGNMENT
if (__predict_false((uintptr_t)addr % sizeof(int16_t))) {
for (i = 0, resid = size & ~1; resid > 0; resid -=
sizeof(int16_t)) {
buf[0] = addr[i++];
buf[1] = addr[i++];
ATA_IDX_OUTW_STRM(ch, ATA_DATA, *(uint16_t *)&buf);
}
} else
#endif
ATA_IDX_OUTSW_STRM(ch, ATA_DATA, (void*)addr, size /
sizeof(int16_t));
if (size & 1) {
buf[0] = (addr + (size & ~1))[0];
ATA_IDX_OUTSW_STRM(ch, ATA_DATA, (void*)buf, 1);
ATA_IDX_OUTW_STRM(ch, ATA_DATA, *(uint16_t *)&buf);
}
} else
ATA_IDX_OUTSL_STRM(ch, ATA_DATA, (void*)addr, size / sizeof(int32_t));