mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
32cb4d02fb
Replace uses of sme_active() with the more generic cc_platform_has() using CC_ATTR_HOST_MEM_ENCRYPT. If future support is added for other memory encryption technologies, the use of CC_ATTR_HOST_MEM_ENCRYPT can be updated, as required. This also replaces two usages of sev_active() that are really geared towards detecting if SME is active. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210928191009.32551-6-bp@alien8.de
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/pci.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/init.h>
|
|
#include <linux/swiotlb.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/dma-direct.h>
|
|
#include <linux/cc_platform.h>
|
|
|
|
#include <asm/iommu.h>
|
|
#include <asm/swiotlb.h>
|
|
#include <asm/dma.h>
|
|
#include <asm/xen/swiotlb-xen.h>
|
|
#include <asm/iommu_table.h>
|
|
|
|
int swiotlb __read_mostly;
|
|
|
|
/*
|
|
* pci_swiotlb_detect_override - set swiotlb to 1 if necessary
|
|
*
|
|
* This returns non-zero if we are forced to use swiotlb (by the boot
|
|
* option).
|
|
*/
|
|
int __init pci_swiotlb_detect_override(void)
|
|
{
|
|
if (swiotlb_force == SWIOTLB_FORCE)
|
|
swiotlb = 1;
|
|
|
|
return swiotlb;
|
|
}
|
|
IOMMU_INIT_FINISH(pci_swiotlb_detect_override,
|
|
pci_xen_swiotlb_detect,
|
|
pci_swiotlb_init,
|
|
pci_swiotlb_late_init);
|
|
|
|
/*
|
|
* If 4GB or more detected (and iommu=off not set) or if SME is active
|
|
* then set swiotlb to 1 and return 1.
|
|
*/
|
|
int __init pci_swiotlb_detect_4gb(void)
|
|
{
|
|
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
|
|
if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
|
|
swiotlb = 1;
|
|
|
|
/*
|
|
* Set swiotlb to 1 so that bounce buffers are allocated and used for
|
|
* devices that can't support DMA to encrypted memory.
|
|
*/
|
|
if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
|
|
swiotlb = 1;
|
|
|
|
return swiotlb;
|
|
}
|
|
IOMMU_INIT(pci_swiotlb_detect_4gb,
|
|
pci_swiotlb_detect_override,
|
|
pci_swiotlb_init,
|
|
pci_swiotlb_late_init);
|
|
|
|
void __init pci_swiotlb_init(void)
|
|
{
|
|
if (swiotlb)
|
|
swiotlb_init(0);
|
|
}
|
|
|
|
void __init pci_swiotlb_late_init(void)
|
|
{
|
|
/* An IOMMU turned us off. */
|
|
if (!swiotlb)
|
|
swiotlb_exit();
|
|
else {
|
|
printk(KERN_INFO "PCI-DMA: "
|
|
"Using software bounce buffering for IO (SWIOTLB)\n");
|
|
swiotlb_print_info();
|
|
}
|
|
}
|