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gerrit-public.fairphone.software / kernel / msm-4.9 / 66bff4ade42c427d7b301e90f0e0cbe88db2ce27 / . / arch / x86 / xen / pci-swiotlb-xen.c
blob: 0e98e5d241d04847c7a9a54c242b7a232ebae148 [file] [log] [blame]
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]1/* Glue code to lib/swiotlb-xen.c */
2
3#include <linux/dma-mapping.h>
Konrad Rzeszutek Wilk74226b82010-08-19 13:34:58 -0400[diff] [blame]4#include <linux/pci.h>
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]5#include <xen/swiotlb-xen.h>
6
7#include <asm/xen/hypervisor.h>
8#include <xen/xen.h>
Konrad Rzeszutek Wilk5cb3a262010-08-26 13:58:01 -0400[diff] [blame]9#include <asm/iommu_table.h>
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]10
Konrad Rzeszutek Wilka5f95152012-09-22 20:01:16 -0400[diff] [blame]11
Konrad Rzeszutek Wilkb8b0f552012-08-21 14:49:34 -0400[diff] [blame]12#include <asm/xen/swiotlb-xen.h>
Konrad Rzeszutek Wilkfc2341d2012-07-27 20:16:00 -0400[diff] [blame]13#ifdef CONFIG_X86_64
14#include <asm/iommu.h>
15#include <asm/dma.h>
16#endif
Konrad Rzeszutek Wilkb8277602012-08-23 14:36:15 -0400[diff] [blame]17#include <linux/export.h>
Konrad Rzeszutek Wilka5f95152012-09-22 20:01:16 -0400[diff] [blame]18
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]19int xen_swiotlb __read_mostly;
20
21static struct dma_map_ops xen_swiotlb_dma_ops = {
22 .mapping_error = xen_swiotlb_dma_mapping_error,
Andrzej Pietrasiewiczbaa676f2012-03-27 14:28:18 +0200[diff] [blame]23 .alloc = xen_swiotlb_alloc_coherent,
24 .free = xen_swiotlb_free_coherent,
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]25 .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
26 .sync_single_for_device = xen_swiotlb_sync_single_for_device,
27 .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
28 .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
29 .map_sg = xen_swiotlb_map_sg_attrs,
30 .unmap_sg = xen_swiotlb_unmap_sg_attrs,
31 .map_page = xen_swiotlb_map_page,
32 .unmap_page = xen_swiotlb_unmap_page,
33 .dma_supported = xen_swiotlb_dma_supported,
34};
35
36/*
37 * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
38 *
39 * This returns non-zero if we are forced to use xen_swiotlb (by the boot
40 * option).
41 */
42int __init pci_xen_swiotlb_detect(void)
43{
44
Konrad Rzeszutek Wilk988f0e22012-07-27 20:10:58 -0400[diff] [blame]45 if (!xen_pv_domain())
46 return 0;
47
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]48 /* If running as PV guest, either iommu=soft, or swiotlb=force will
49 * activate this IOMMU. If running as PV privileged, activate it
Justin P. Mattock70f23fd2011-05-10 10:16:21 +0200[diff] [blame]50 * irregardless.
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]51 */
Konrad Rzeszutek Wilk988f0e22012-07-27 20:10:58 -0400[diff] [blame]52 if ((xen_initial_domain() || swiotlb || swiotlb_force))
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]53 xen_swiotlb = 1;
54
55 /* If we are running under Xen, we MUST disable the native SWIOTLB.
56 * Don't worry about swiotlb_force flag activating the native, as
57 * the 'swiotlb' flag is the only one turning it on. */
Konrad Rzeszutek Wilk988f0e22012-07-27 20:10:58 -0400[diff] [blame]58 swiotlb = 0;
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]59
Konrad Rzeszutek Wilkfc2341d2012-07-27 20:16:00 -0400[diff] [blame]60#ifdef CONFIG_X86_64
61 /* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0
62 * (so no iommu=X command line over-writes).
63 * Considering that PV guests do not want the *native SWIOTLB* but
64 * only Xen SWIOTLB it is not useful to us so set no_iommu=1 here.
65 */
66 if (max_pfn > MAX_DMA32_PFN)
67 no_iommu = 1;
68#endif
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]69 return xen_swiotlb;
70}
71
72void __init pci_xen_swiotlb_init(void)
73{
74 if (xen_swiotlb) {
Konrad Rzeszutek Wilkb8277602012-08-23 14:36:15 -0400[diff] [blame]75 xen_swiotlb_init(1, true /* early */);
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]76 dma_ops = &xen_swiotlb_dma_ops;
Konrad Rzeszutek Wilk74226b82010-08-19 13:34:58 -0400[diff] [blame]77
Stefano Stabellini92c0fd12013-11-04 18:11:54 +0000[diff] [blame]78#ifdef CONFIG_PCI
Konrad Rzeszutek Wilk74226b82010-08-19 13:34:58 -0400[diff] [blame]79 /* Make sure ACS will be enabled */
80 pci_request_acs();
Stefano Stabellini92c0fd12013-11-04 18:11:54 +0000[diff] [blame]81#endif
Konrad Rzeszutek Wilkbbbe5732010-02-09 14:30:55 -0500[diff] [blame]82 }
83}
Konrad Rzeszutek Wilkb8277602012-08-23 14:36:15 -0400[diff] [blame]84
85int pci_xen_swiotlb_init_late(void)
86{
87 int rc;
88
89 if (xen_swiotlb)
90 return 0;
91
92 rc = xen_swiotlb_init(1, false /* late */);
93 if (rc)
94 return rc;
95
96 dma_ops = &xen_swiotlb_dma_ops;
Stefano Stabellini92c0fd12013-11-04 18:11:54 +0000[diff] [blame]97#ifdef CONFIG_PCI
Konrad Rzeszutek Wilkb8277602012-08-23 14:36:15 -0400[diff] [blame]98 /* Make sure ACS will be enabled */
99 pci_request_acs();
Stefano Stabellini92c0fd12013-11-04 18:11:54 +0000[diff] [blame]100#endif
Konrad Rzeszutek Wilkb8277602012-08-23 14:36:15 -0400[diff] [blame]101
102 return 0;
103}
104EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
105
Konrad Rzeszutek Wilk5cb3a262010-08-26 13:58:01 -0400[diff] [blame]106IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
Konrad Rzeszutek Wilk6d7083e2012-08-13 11:00:08 -0400[diff] [blame]107 NULL,
Konrad Rzeszutek Wilk5cb3a262010-08-26 13:58:01 -0400[diff] [blame]108 pci_xen_swiotlb_init,
Konrad Rzeszutek Wilk6d7083e2012-08-13 11:00:08 -0400[diff] [blame]109 NULL);