Hello,
When I test my kernel driver on a Sparc server with limited memory, I find that
3 of 4 driver instances can be loaded successfully. But the 4th one always
fails in the attach stage due to dma memory allocation failure:
WARNING: ddi_dma_mem_alloc failed, return value: -1
Then I added several Gig of DDR memory module, however, the failure remains. I
am thinking whether the dma-able memory per server is limited, no matter what
the total system memory is? how do I know the limitation? Or, is this related
to the dma attribute I am using?
ddi_dma_attr_t dma_attr_rbuf = {
DMA_ATTR_V0, /* dma_attr_version */
0, /* low DMA address range */
(uint64_t)0xffffffffffffffffull, /* high DMA address range */
(uint64_t)0xffffffff, /* DMA counter register */
0x1, /* DMA address alignment */
0xfff, /* DMA burstsizes */
1, /* min effective DMA size */
(uint64_t)0xffffffff, /* max DMA xfer size */
(uint64_t)0xffffffff, /* segment boundary */
16, /* s/g list length, i.e no sg list */
1, /* granularity of device */
0 /* DMA transfer flags */
};
Tom
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