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author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-23 18:36:15 (GMT) |
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committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-09-17 16:58:16 (GMT) |
commit | b82776005369899c1c7ca2e4b2414bb64b538d2c (patch) | |
tree | b07bb5fc8cd2b335f46a43791f0fc7505a57d4ac /drivers/xen/swiotlb-xen.c | |
parent | 5bab7864b1167f9a72d375f6854027db436a1cc1 (diff) | |
download | linux-b82776005369899c1c7ca2e4b2414bb64b538d2c.tar.xz |
xen/swiotlb: Use the swiotlb_late_init_with_tbl to init Xen-SWIOTLB late when PV PCI is used.
With this patch we provide the functionality to initialize the
Xen-SWIOTLB late in the bootup cycle - specifically for
Xen PCI-frontend. We still will work if the user had
supplied 'iommu=soft' on the Linux command line.
Note: We cannot depend on after_bootmem to automatically
determine whether this is early or not. This is because
when PCI IOMMUs are initialized it is after after_bootmem but
before a lot of "other" subsystems are initialized.
CC: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
[v1: Fix smatch warnings]
[v2: Added check for xen_swiotlb]
[v3: Rebased with new xen-swiotlb changes]
[v4: squashed xen/swiotlb: Depending on after_bootmem is not correct in]
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/swiotlb-xen.c')
-rw-r--r-- | drivers/xen/swiotlb-xen.c | 48 |
1 files changed, 38 insertions, 10 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 701b103..7461edb 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -176,9 +176,9 @@ static const char *xen_swiotlb_error(enum xen_swiotlb_err err) } return ""; } -void __init xen_swiotlb_init(int verbose) +int __ref xen_swiotlb_init(int verbose, bool early) { - unsigned long bytes; + unsigned long bytes, order; int rc = -ENOMEM; enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN; unsigned int repeat = 3; @@ -186,10 +186,28 @@ void __init xen_swiotlb_init(int verbose) xen_io_tlb_nslabs = swiotlb_nr_tbl(); retry: bytes = xen_set_nslabs(xen_io_tlb_nslabs); + order = get_order(xen_io_tlb_nslabs << IO_TLB_SHIFT); /* * Get IO TLB memory from any location. */ - xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes)); + if (early) + xen_io_tlb_start = alloc_bootmem_pages(PAGE_ALIGN(bytes)); + else { +#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT)) +#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT) + while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { + xen_io_tlb_start = (void *)__get_free_pages(__GFP_NOWARN, order); + if (xen_io_tlb_start) + break; + order--; + } + if (order != get_order(bytes)) { + pr_warn("Warning: only able to allocate %ld MB " + "for software IO TLB\n", (PAGE_SIZE << order) >> 20); + xen_io_tlb_nslabs = SLABS_PER_PAGE << order; + bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT; + } + } if (!xen_io_tlb_start) { m_ret = XEN_SWIOTLB_ENOMEM; goto error; @@ -202,14 +220,21 @@ retry: bytes, xen_io_tlb_nslabs); if (rc) { - free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes)); + if (early) + free_bootmem(__pa(xen_io_tlb_start), PAGE_ALIGN(bytes)); + else { + free_pages((unsigned long)xen_io_tlb_start, order); + xen_io_tlb_start = NULL; + } m_ret = XEN_SWIOTLB_EFIXUP; goto error; } start_dma_addr = xen_virt_to_bus(xen_io_tlb_start); - swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose); - - return; + if (early) + swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs, verbose); + else + rc = swiotlb_late_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs); + return rc; error: if (repeat--) { xen_io_tlb_nslabs = max(1024UL, /* Min is 2MB */ @@ -218,10 +243,13 @@ error: (xen_io_tlb_nslabs << IO_TLB_SHIFT) >> 20); goto retry; } - xen_raw_printk("%s (rc:%d)", xen_swiotlb_error(m_ret), rc); - panic("%s (rc:%d)", xen_swiotlb_error(m_ret), rc); + pr_err("%s (rc:%d)", xen_swiotlb_error(m_ret), rc); + if (early) + panic("%s (rc:%d)", xen_swiotlb_error(m_ret), rc); + else + free_pages((unsigned long)xen_io_tlb_start, order); + return rc; } - void * xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t flags, |