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xen/swiotlb: Move the error strings to its own function.

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That way we can more easily reuse those errors when using the
late SWIOTLB init.

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-08-23 14:03:55 -04:00
parent 1cef36a529
commit 5bab7864b1
1 changed files with 27 additions and 8 deletions
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35
drivers/xen/swiotlb-xen.c
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@ -154,11 +154,33 @@ static unsigned long xen_set_nslabs(unsigned long nr_tbl)
return xen_io_tlb_nslabs << IO_TLB_SHIFT;
}
enum xen_swiotlb_err {
XEN_SWIOTLB_UNKNOWN = 0,
XEN_SWIOTLB_ENOMEM,
XEN_SWIOTLB_EFIXUP
};
static const char *xen_swiotlb_error(enum xen_swiotlb_err err)
{
switch (err) {
case XEN_SWIOTLB_ENOMEM:
return "Cannot allocate Xen-SWIOTLB buffer\n";
case XEN_SWIOTLB_EFIXUP:
return "Failed to get contiguous memory for DMA from Xen!\n"\
"You either: don't have the permissions, do not have"\
" enough free memory under 4GB, or the hypervisor memory"\
" is too fragmented!";
default:
break;
}
return "";
}
void __init xen_swiotlb_init(int verbose)
{
unsigned long bytes;
int rc = -ENOMEM;
char *m = NULL;
enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
unsigned int repeat = 3;
xen_io_tlb_nslabs = swiotlb_nr_tbl();
@ -169,7 +191,7 @@ void __init xen_swiotlb_init(int verbose)
*/
xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes));
if (!xen_io_tlb_start) {
m = "Cannot allocate Xen-SWIOTLB buffer!\n";
m_ret = XEN_SWIOTLB_ENOMEM;
goto error;
}
xen_io_tlb_end = xen_io_tlb_start + bytes;
@ -181,10 +203,7 @@ void __init xen_swiotlb_init(int verbose)
xen_io_tlb_nslabs);
if (rc) {
free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes));
m = "Failed to get contiguous memory for DMA from Xen!\n"\
"You either: don't have the permissions, do not have"\
" enough free memory under 4GB, or the hypervisor memory"\
"is too fragmented!";
m_ret = XEN_SWIOTLB_EFIXUP;
goto error;
}
start_dma_addr = xen_virt_to_bus(xen_io_tlb_start);
@ -199,8 +218,8 @@ void __init xen_swiotlb_init(int verbose)
(xen_io_tlb_nslabs << IO_TLB_SHIFT) >> 20);
goto retry;
}
xen_raw_printk("%s (rc:%d)", m, rc);
panic("%s (rc:%d)", m, rc);
xen_raw_printk("%s (rc:%d)", xen_swiotlb_error(m_ret), rc);
panic("%s (rc:%d)", xen_swiotlb_error(m_ret), rc);
}
void *