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IDE: Improve DMA transfers by increasing the buffer size 

(Ian Jackson)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4132 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-03-29 12:15:35 +00:00
parent 6ae20372d4
commit 1d8cde5beb
1 changed files with 13 additions and 7 deletions
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20
hw/ide.c
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@ -202,6 +202,12 @@
/* set to 1 set disable mult support */
#define MAX_MULT_SECTORS 16
#define IDE_DMA_BUF_SECTORS 256
#if (IDE_DMA_BUF_SECTORS < MAX_MULT_SECTORS)
#error "IDE_DMA_BUF_SECTORS must be bigger or equal to MAX_MULT_SECTORS"
#endif
/* ATAPI defines */
#define ATAPI_PACKET_SIZE 12
@ -899,8 +905,8 @@ static void ide_read_dma_cb(void *opaque, int ret)
/* launch next transfer */
n = s->nsector;
if (n > MAX_MULT_SECTORS)
n = MAX_MULT_SECTORS;
if (n > IDE_DMA_BUF_SECTORS)
n = IDE_DMA_BUF_SECTORS;
s->io_buffer_index = 0;
s->io_buffer_size = n * 512;
#ifdef DEBUG_AIO
@ -998,8 +1004,8 @@ static void ide_write_dma_cb(void *opaque, int ret)
/* launch next transfer */
n = s->nsector;
if (n > MAX_MULT_SECTORS)
n = MAX_MULT_SECTORS;
if (n > IDE_DMA_BUF_SECTORS)
n = IDE_DMA_BUF_SECTORS;
s->io_buffer_index = 0;
s->io_buffer_size = n * 512;
@ -1293,8 +1299,8 @@ static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
data_offset = 16;
} else {
n = s->packet_transfer_size >> 11;
if (n > (MAX_MULT_SECTORS / 4))
n = (MAX_MULT_SECTORS / 4);
if (n > (IDE_DMA_BUF_SECTORS / 4))
n = (IDE_DMA_BUF_SECTORS / 4);
s->io_buffer_size = n * 2048;
data_offset = 0;
}
@ -2524,7 +2530,7 @@ static void ide_init2(IDEState *ide_state,
for(i = 0; i < 2; i++) {
s = ide_state + i;
s->io_buffer = qemu_memalign(512, MAX_MULT_SECTORS*512 + 4);
s->io_buffer = qemu_memalign(512, IDE_DMA_BUF_SECTORS*512 + 4);
if (i == 0)
s->bs = hd0;
else