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dma-mapping updates for Linux 5.19

Browse Source 
- don't over-decrypt memory (Robin Murphy)
  - takes min align mask into account for the swiotlb max mapping size
    (Tianyu Lan)
  - use GFP_ATOMIC in dma-debug (Mikulas Patocka)
  - fix DMA_ATTR_NO_KERNEL_MAPPING on xen/arm (me)
  - don't fail on highmem CMA pages in dma_direct_alloc_pages (me)
  - cleanup swiotlb initialization and share more code with swiotlb-xen
    (me, Stefano Stabellini)
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Merge tag 'dma-mapping-5.19-2022-05-25' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping updates from Christoph Hellwig:

 - don't over-decrypt memory (Robin Murphy)

 - takes min align mask into account for the swiotlb max mapping size
   (Tianyu Lan)

 - use GFP_ATOMIC in dma-debug (Mikulas Patocka)

 - fix DMA_ATTR_NO_KERNEL_MAPPING on xen/arm (me)

 - don't fail on highmem CMA pages in dma_direct_alloc_pages (me)

 - cleanup swiotlb initialization and share more code with swiotlb-xen
   (me, Stefano Stabellini)

* tag 'dma-mapping-5.19-2022-05-25' of git://git.infradead.org/users/hch/dma-mapping: (23 commits)
  dma-direct: don't over-decrypt memory
  swiotlb: max mapping size takes min align mask into account
  swiotlb: use the right nslabs-derived sizes in swiotlb_init_late
  swiotlb: use the right nslabs value in swiotlb_init_remap
  swiotlb: don't panic when the swiotlb buffer can't be allocated
  dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC
  dma-direct: don't fail on highmem CMA pages in dma_direct_alloc_pages
  swiotlb-xen: fix DMA_ATTR_NO_KERNEL_MAPPING on arm
  x86: remove cruft from <asm/dma-mapping.h>
  swiotlb: remove swiotlb_init_with_tbl and swiotlb_init_late_with_tbl
  swiotlb: merge swiotlb-xen initialization into swiotlb
  swiotlb: provide swiotlb_init variants that remap the buffer
  swiotlb: pass a gfp_mask argument to swiotlb_init_late
  swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction
  swiotlb: make the swiotlb_init interface more useful
  x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled
  x86: remove the IOMMU table infrastructure
  MIPS/octeon: use swiotlb_init instead of open coding it
  arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region
  swiotlb: rename swiotlb_late_init_with_default_size
  ...
This commit is contained in:
Linus Torvalds 2022-05-25 19:18:36 -07:00
commit 3f306ea2e1
56 changed files with 318 additions and 982 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/include/asm/xen/page-coherent.h
View File

@ -1,2 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <xen/arm/page-coherent.h>

6
arch/arm/mm/init.c
View File

@ -271,11 +271,7 @@ static void __init free_highpages(void)
void __init mem_init(void)
{
#ifdef CONFIG_ARM_LPAE
if (swiotlb_force == SWIOTLB_FORCE ||
max_pfn > arm_dma_pfn_limit)
swiotlb_init(1);
else
swiotlb_force = SWIOTLB_NO_FORCE;
swiotlb_init(max_pfn > arm_dma_pfn_limit, SWIOTLB_VERBOSE);
#endif
set_max_mapnr(pfn_to_page(max_pfn) - mem_map);

38
arch/arm/xen/mm.c
View File

@ -23,22 +23,20 @@
#include <asm/xen/hypercall.h>
#include <asm/xen/interface.h>
unsigned long xen_get_swiotlb_free_pages(unsigned int order)
static gfp_t xen_swiotlb_gfp(void)
{
phys_addr_t base;
gfp_t flags = __GFP_NOWARN|__GFP_KSWAPD_RECLAIM;
u64 i;
for_each_mem_range(i, &base, NULL) {
if (base < (phys_addr_t)0xffffffff) {
if (IS_ENABLED(CONFIG_ZONE_DMA32))
flags |= __GFP_DMA32;
else
flags |= __GFP_DMA;
break;
return __GFP_DMA32;
return __GFP_DMA;
}
}
return __get_free_pages(flags, order);
return GFP_KERNEL;
}
static bool hypercall_cflush = false;
@ -118,23 +116,6 @@ bool xen_arch_need_swiotlb(struct device *dev,
!dev_is_dma_coherent(dev));
}
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle)
{
if (!xen_initial_domain())
return -EINVAL;
/* we assume that dom0 is mapped 1:1 for now */
*dma_handle = pstart;
return 0;
}
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order)
{
return;
}
static int __init xen_mm_init(void)
{
struct gnttab_cache_flush cflush;
@ -143,10 +124,13 @@ static int __init xen_mm_init(void)
if (!xen_swiotlb_detect())
return 0;
rc = xen_swiotlb_init();
/* we can work with the default swiotlb */
if (rc < 0 && rc != -EEXIST)
return rc;
if (!io_tlb_default_mem.nslabs) {
rc = swiotlb_init_late(swiotlb_size_or_default(),
xen_swiotlb_gfp(), NULL);
if (rc < 0)
return rc;
}
cflush.op = 0;
cflush.a.dev_bus_addr = 0;

2
arch/arm64/include/asm/xen/page-coherent.h
View File

@ -1,2 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <xen/arm/page-coherent.h>

6
arch/arm64/mm/init.c
View File

@ -451,11 +451,7 @@ void __init bootmem_init(void)
*/
void __init mem_init(void)
{
if (swiotlb_force == SWIOTLB_FORCE ||
max_pfn > PFN_DOWN(arm64_dma_phys_limit))
swiotlb_init(1);
else if (!xen_swiotlb_detect())
swiotlb_force = SWIOTLB_NO_FORCE;
swiotlb_init(max_pfn > PFN_DOWN(arm64_dma_phys_limit), SWIOTLB_VERBOSE);
/* this will put all unused low memory onto the freelists */
memblock_free_all();

7
arch/ia64/include/asm/iommu_table.h
View File

@ -1,7 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_IA64_IOMMU_TABLE_H
#define _ASM_IA64_IOMMU_TABLE_H
#define IOMMU_INIT_POST(_detect)
#endif /* _ASM_IA64_IOMMU_TABLE_H */

4
arch/ia64/mm/init.c
View File

@ -437,9 +437,7 @@ mem_init (void)
if (iommu_detected)
break;
#endif
#ifdef CONFIG_SWIOTLB
swiotlb_init(1);
#endif
swiotlb_init(true, SWIOTLB_VERBOSE);
} while (0);
#ifdef CONFIG_FLATMEM

15
arch/mips/cavium-octeon/dma-octeon.c
View File

@ -186,15 +186,12 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
return daddr;
}
char *octeon_swiotlb;
void __init plat_swiotlb_setup(void)
{
phys_addr_t start, end;
phys_addr_t max_addr;
phys_addr_t addr_size;
size_t swiotlbsize;
unsigned long swiotlb_nslabs;
u64 i;
max_addr = 0;
@ -236,15 +233,7 @@ void __init plat_swiotlb_setup(void)
if (OCTEON_IS_OCTEON2() && max_addr >= 0x100000000ul)
swiotlbsize = 64 * (1<<20);
#endif
swiotlb_nslabs = swiotlbsize >> IO_TLB_SHIFT;
swiotlb_nslabs = ALIGN(swiotlb_nslabs, IO_TLB_SEGSIZE);
swiotlbsize = swiotlb_nslabs << IO_TLB_SHIFT;
octeon_swiotlb = memblock_alloc_low(swiotlbsize, PAGE_SIZE);
if (!octeon_swiotlb)
panic("%s: Failed to allocate %zu bytes align=%lx\n",
__func__, swiotlbsize, PAGE_SIZE);
if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM)
panic("Cannot allocate SWIOTLB buffer");
swiotlb_adjust_size(swiotlbsize);
swiotlb_init(true, SWIOTLB_VERBOSE);
}

2
arch/mips/loongson64/dma.c
View File

@ -24,5 +24,5 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
void __init plat_swiotlb_setup(void)
{
swiotlb_init(1);
swiotlb_init(true, SWIOTLB_VERBOSE);
}

2
arch/mips/pci/pci-octeon.c
View File

@ -664,7 +664,7 @@ static int __init octeon_pci_setup(void)
/* BAR1 movable regions contiguous to cover the swiotlb */
octeon_bar1_pci_phys =
virt_to_phys(octeon_swiotlb) & ~((1ull << 22) - 1);
io_tlb_default_mem.start & ~((1ull << 22) - 1);
for (index = 0; index < 32; index++) {
union cvmx_pci_bar1_indexx bar1_index;

2
arch/mips/sibyte/common/dma.c
View File

@ -10,5 +10,5 @@
void __init plat_swiotlb_setup(void)
{
swiotlb_init(1);
swiotlb_init(true, SWIOTLB_VERBOSE);
}

4
arch/powerpc/include/asm/svm.h
View File

@ -15,8 +15,6 @@ static inline bool is_secure_guest(void)
return mfmsr() & MSR_S;
}
void __init svm_swiotlb_init(void);
void dtl_cache_ctor(void *addr);
#define get_dtl_cache_ctor() (is_secure_guest() ? dtl_cache_ctor : NULL)
@ -27,8 +25,6 @@ static inline bool is_secure_guest(void)
return false;
}
static inline void svm_swiotlb_init(void) {}
#define get_dtl_cache_ctor() NULL
#endif /* CONFIG_PPC_SVM */

1
arch/powerpc/include/asm/swiotlb.h
View File

@ -9,6 +9,7 @@
#include <linux/swiotlb.h>
extern unsigned int ppc_swiotlb_enable;
extern unsigned int ppc_swiotlb_flags;
#ifdef CONFIG_SWIOTLB
void swiotlb_detect_4g(void);

1
arch/powerpc/kernel/dma-swiotlb.c
View File

@ -10,6 +10,7 @@
#include <asm/swiotlb.h>
unsigned int ppc_swiotlb_enable;
unsigned int ppc_swiotlb_flags;
void __init swiotlb_detect_4g(void)
{

6
arch/powerpc/mm/mem.c
View File

@ -17,6 +17,7 @@
#include <linux/suspend.h>
#include <linux/dma-direct.h>
#include <asm/swiotlb.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/kasan.h>
@ -248,10 +249,7 @@ void __init mem_init(void)
* back to to-down.
*/
memblock_set_bottom_up(true);
if (is_secure_guest())
svm_swiotlb_init();
else
swiotlb_init(0);
swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
#endif
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);

3
arch/powerpc/platforms/pseries/setup.c
View File

@ -849,9 +849,6 @@ static void __init pSeries_setup_arch(void)
}
ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
if (swiotlb_force == SWIOTLB_FORCE)
ppc_swiotlb_enable = 1;
}
static void pseries_panic(char *str)

26
arch/powerpc/platforms/pseries/svm.c
View File

@ -28,7 +28,7 @@ static int __init init_svm(void)
* need to use the SWIOTLB buffer for DMA even if dma_capable() says
* otherwise.
*/
swiotlb_force = SWIOTLB_FORCE;
ppc_swiotlb_flags |= SWIOTLB_ANY | SWIOTLB_FORCE;
/* Share the SWIOTLB buffer with the host. */
swiotlb_update_mem_attributes();
@ -37,30 +37,6 @@ static int __init init_svm(void)
}
machine_early_initcall(pseries, init_svm);
/*
* Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it
* can allocate the buffer anywhere in memory. Since the hypervisor doesn't have
* any addressing limitation, we don't need to allocate it in low addresses.
*/
void __init svm_swiotlb_init(void)
{
unsigned char *vstart;
unsigned long bytes, io_tlb_nslabs;
io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT);
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
bytes = io_tlb_nslabs << IO_TLB_SHIFT;
vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE);
if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
return;
memblock_free(vstart, PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
panic("SVM: Cannot allocate SWIOTLB buffer");
}
int set_memory_encrypted(unsigned long addr, int numpages)
{
if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))

8
arch/riscv/mm/init.c
View File

@ -120,13 +120,7 @@ void __init mem_init(void)
BUG_ON(!mem_map);
#endif /* CONFIG_FLATMEM */
#ifdef CONFIG_SWIOTLB
if (swiotlb_force == SWIOTLB_FORCE ||
max_pfn > PFN_DOWN(dma32_phys_limit))
swiotlb_init(1);
else
swiotlb_force = SWIOTLB_NO_FORCE;
#endif
swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
memblock_free_all();
print_vm_layout();

3
arch/s390/mm/init.c
View File

@ -185,8 +185,7 @@ static void pv_init(void)
return;
/* make sure bounce buffers are shared */
swiotlb_force = SWIOTLB_FORCE;
swiotlb_init(1);
swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
swiotlb_update_mem_attributes();
}

12
arch/x86/include/asm/dma-mapping.h
View File

@ -2,18 +2,6 @@
#ifndef _ASM_X86_DMA_MAPPING_H
#define _ASM_X86_DMA_MAPPING_H
/*
* IOMMU interface. See Documentation/core-api/dma-api-howto.rst and
* Documentation/core-api/dma-api.rst for documentation.
*/
#include <linux/scatterlist.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
extern int iommu_merge;
extern int panic_on_overflow;
extern const struct dma_map_ops *dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

5
arch/x86/include/asm/gart.h
View File

@ -38,7 +38,7 @@ extern int gart_iommu_aperture_disabled;
extern void early_gart_iommu_check(void);
extern int gart_iommu_init(void);
extern void __init gart_parse_options(char *);
extern int gart_iommu_hole_init(void);
void gart_iommu_hole_init(void);
#else
#define gart_iommu_aperture 0
@ -51,9 +51,8 @@ static inline void early_gart_iommu_check(void)
static inline void gart_parse_options(char *options)
{
}
static inline int gart_iommu_hole_init(void)
static inline void gart_iommu_hole_init(void)
{
return -ENODEV;
}
#endif

8
arch/x86/include/asm/iommu.h
View File

@ -8,6 +8,14 @@
extern int force_iommu, no_iommu;
extern int iommu_detected;
extern int iommu_merge;
extern int panic_on_overflow;
#ifdef CONFIG_SWIOTLB
extern bool x86_swiotlb_enable;
#else
#define x86_swiotlb_enable false
#endif
/* 10 seconds */
#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)

102
arch/x86/include/asm/iommu_table.h
View File

@ -1,102 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_IOMMU_TABLE_H
#define _ASM_X86_IOMMU_TABLE_H
#include <asm/swiotlb.h>
/*
* History lesson:
* The execution chain of IOMMUs in 2.6.36 looks as so:
*
* [xen-swiotlb]
* |
* +----[swiotlb *]--+
* / | \
* / | \
* [GART] [Calgary] [Intel VT-d]
* /
* /
* [AMD-Vi]
*
* *: if SWIOTLB detected 'iommu=soft'/'swiotlb=force' it would skip
* over the rest of IOMMUs and unconditionally initialize the SWIOTLB.
* Also it would surreptitiously initialize set the swiotlb=1 if there were
* more than 4GB and if the user did not pass in 'iommu=off'. The swiotlb
* flag would be turned off by all IOMMUs except the Calgary one.
*
* The IOMMU_INIT* macros allow a similar tree (or more complex if desired)
* to be built by defining who we depend on.
*
* And all that needs to be done is to use one of the macros in the IOMMU
* and the pci-dma.c will take care of the rest.
*/
struct iommu_table_entry {
initcall_t detect;
initcall_t depend;
void (*early_init)(void); /* No memory allocate available. */
void (*late_init)(void); /* Yes, can allocate memory. */
#define IOMMU_FINISH_IF_DETECTED (1<<0)
#define IOMMU_DETECTED (1<<1)
int flags;
};
/*
* Macro fills out an entry in the .iommu_table that is equivalent
* to the fields that 'struct iommu_table_entry' has. The entries
* that are put in the .iommu_table section are not put in any order
* hence during boot-time we will have to resort them based on
* dependency. */
#define __IOMMU_INIT(_detect, _depend, _early_init, _late_init, _finish)\
static const struct iommu_table_entry \
__iommu_entry_##_detect __used \
__attribute__ ((unused, __section__(".iommu_table"), \
aligned((sizeof(void *))))) \
= {_detect, _depend, _early_init, _late_init, \
_finish ? IOMMU_FINISH_IF_DETECTED : 0}
/*
* The simplest IOMMU definition. Provide the detection routine
* and it will be run after the SWIOTLB and the other IOMMUs
* that utilize this macro. If the IOMMU is detected (ie, the
* detect routine returns a positive value), the other IOMMUs
* are also checked. You can use IOMMU_INIT_POST_FINISH if you prefer
* to stop detecting the other IOMMUs after yours has been detected.
*/
#define IOMMU_INIT_POST(_detect) \
__IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 0)
#define IOMMU_INIT_POST_FINISH(detect) \
__IOMMU_INIT(_detect, pci_swiotlb_detect_4gb, NULL, NULL, 1)
/*
* A more sophisticated version of IOMMU_INIT. This variant requires:
* a). A detection routine function.
* b). The name of the detection routine we depend on to get called
* before us.
* c). The init routine which gets called if the detection routine
* returns a positive value from the pci_iommu_alloc. This means
* no presence of a memory allocator.
* d). Similar to the 'init', except that this gets called from pci_iommu_init
* where we do have a memory allocator.
*
* The standard IOMMU_INIT differs from the IOMMU_INIT_FINISH variant
* in that the former will continue detecting other IOMMUs in the call
* list after the detection routine returns a positive number, while the
* latter will stop the execution chain upon first successful detection.
* Both variants will still call the 'init' and 'late_init' functions if
* they are set.
*/
#define IOMMU_INIT_FINISH(_detect, _depend, _init, _late_init) \
__IOMMU_INIT(_detect, _depend, _init, _late_init, 1)
#define IOMMU_INIT(_detect, _depend, _init, _late_init) \
__IOMMU_INIT(_detect, _depend, _init, _late_init, 0)
void sort_iommu_table(struct iommu_table_entry *start,
struct iommu_table_entry *finish);
void check_iommu_entries(struct iommu_table_entry *start,
struct iommu_table_entry *finish);
#endif /* _ASM_X86_IOMMU_TABLE_H */

30
arch/x86/include/asm/swiotlb.h
View File

@ -1,30 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_SWIOTLB_H
#define _ASM_X86_SWIOTLB_H
#include <linux/swiotlb.h>
#ifdef CONFIG_SWIOTLB
extern int swiotlb;
extern int __init pci_swiotlb_detect_override(void);
extern int __init pci_swiotlb_detect_4gb(void);
extern void __init pci_swiotlb_init(void);
extern void __init pci_swiotlb_late_init(void);
#else
#define swiotlb 0
static inline int pci_swiotlb_detect_override(void)
{
return 0;
}
static inline int pci_swiotlb_detect_4gb(void)
{
return 0;
}
static inline void pci_swiotlb_init(void)
{
}
static inline void pci_swiotlb_late_init(void)
{
}
#endif
#endif /* _ASM_X86_SWIOTLB_H */

24
arch/x86/include/asm/xen/page-coherent.h
View File

@ -1,24 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_XEN_PAGE_COHERENT_H
#define _ASM_X86_XEN_PAGE_COHERENT_H
#include <asm/page.h>
#include <linux/dma-mapping.h>
static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
unsigned long attrs)
{
void *vstart = (void*)__get_free_pages(flags, get_order(size));
*dma_handle = virt_to_phys(vstart);
return vstart;
}
static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
void *cpu_addr, dma_addr_t dma_handle,
unsigned long attrs)
{
free_pages((unsigned long) cpu_addr, get_order(size));
}
#endif /* _ASM_X86_XEN_PAGE_COHERENT_H */

5
arch/x86/include/asm/xen/page.h
View File

@ -357,9 +357,4 @@ static inline bool xen_arch_need_swiotlb(struct device *dev,
return false;
}
static inline unsigned long xen_get_swiotlb_free_pages(unsigned int order)
{
return __get_free_pages(__GFP_NOWARN, order);
}
#endif /* _ASM_X86_XEN_PAGE_H */

8
arch/x86/include/asm/xen/swiotlb-xen.h
View File

@ -3,11 +3,15 @@
#define _ASM_X86_SWIOTLB_XEN_H
#ifdef CONFIG_SWIOTLB_XEN
extern int __init pci_xen_swiotlb_detect(void);
extern int pci_xen_swiotlb_init_late(void);
#else
#define pci_xen_swiotlb_detect NULL
static inline int pci_xen_swiotlb_init_late(void) { return -ENXIO; }
#endif
int xen_swiotlb_fixup(void *buf, unsigned long nslabs);
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle);
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
#endif /* _ASM_X86_SWIOTLB_XEN_H */

2
arch/x86/kernel/Makefile
View File

@ -66,7 +66,6 @@ obj-y += bootflag.o e820.o
obj-y += pci-dma.o quirks.o topology.o kdebugfs.o
obj-y += alternative.o i8253.o hw_breakpoint.o
obj-y += tsc.o tsc_msr.o io_delay.o rtc.o
obj-y += pci-iommu_table.o
obj-y += resource.o
obj-y += irqflags.o
obj-y += static_call.o
@ -132,7 +131,6 @@ obj-$(CONFIG_PCSPKR_PLATFORM) += pcspeaker.o
obj-$(CONFIG_X86_CHECK_BIOS_CORRUPTION) += check.o
obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
obj-$(CONFIG_OF) += devicetree.o
obj-$(CONFIG_UPROBES) += uprobes.o

5
arch/x86/kernel/amd_gart_64.c
View File

@ -38,11 +38,9 @@
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/set_memory.h>
#include <asm/swiotlb.h>
#include <asm/dma.h>
#include <asm/amd_nb.h>
#include <asm/x86_init.h>
#include <asm/iommu_table.h>
static unsigned long iommu_bus_base; /* GART remapping area (physical) */
static unsigned long iommu_size; /* size of remapping area bytes */
@ -808,7 +806,7 @@ int __init gart_iommu_init(void)
flush_gart();
dma_ops = &gart_dma_ops;
x86_platform.iommu_shutdown = gart_iommu_shutdown;
swiotlb = 0;
x86_swiotlb_enable = false;
return 0;
}
@ -842,4 +840,3 @@ void __init gart_parse_options(char *p)
}
}
}
IOMMU_INIT_POST(gart_iommu_hole_init);

14
arch/x86/kernel/aperture_64.c
View File

@ -392,7 +392,7 @@ void __init early_gart_iommu_check(void)
static int __initdata printed_gart_size_msg;
int __init gart_iommu_hole_init(void)
void __init gart_iommu_hole_init(void)
{
u32 agp_aper_base = 0, agp_aper_order = 0;
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
@ -401,11 +401,11 @@ int __init gart_iommu_hole_init(void)
int i, node;
if (!amd_gart_present())
return -ENODEV;
return;
if (gart_iommu_aperture_disabled || !fix_aperture ||
!early_pci_allowed())
return -ENODEV;
return;
pr_info("Checking aperture...\n");
@ -491,10 +491,8 @@ int __init gart_iommu_hole_init(void)
* and fixed up the northbridge
*/
exclude_from_core(last_aper_base, last_aper_order);
return 1;
}
return 0;
return;
}
if (!fallback_aper_force) {
@ -527,7 +525,7 @@ int __init gart_iommu_hole_init(void)
panic("Not enough memory for aperture");
}
} else {
return 0;
return;
}
/*
@ -561,6 +559,4 @@ int __init gart_iommu_hole_init(void)
}
set_up_gart_resume(aper_order, aper_alloc);
return 1;
}

8
arch/x86/kernel/cpu/mshyperv.c
View File

@ -337,14 +337,6 @@ static void __init ms_hyperv_init_platform(void)
swiotlb_unencrypted_base = ms_hyperv.shared_gpa_boundary;
#endif
}
#ifdef CONFIG_SWIOTLB
/*
* Enable swiotlb force mode in Isolation VM to
* use swiotlb bounce buffer for dma transaction.
*/
swiotlb_force = SWIOTLB_FORCE;
#endif
/* Isolation VMs are unenlightened SEV-based VMs, thus this check: */
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
if (hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE)

114
arch/x86/kernel/pci-dma.c
View File

@ -7,13 +7,16 @@
#include <linux/memblock.h>
#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/amd-iommu.h>
#include <asm/proto.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/x86_init.h>
#include <asm/iommu_table.h>
#include <xen/xen.h>
#include <xen/swiotlb-xen.h>
static bool disable_dac_quirk __read_mostly;
@ -34,24 +37,90 @@ int no_iommu __read_mostly;
/* Set this to 1 if there is a HW IOMMU in the system */
int iommu_detected __read_mostly = 0;
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
#ifdef CONFIG_SWIOTLB
bool x86_swiotlb_enable;
static unsigned int x86_swiotlb_flags;
static void __init pci_swiotlb_detect(void)
{
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
if (!no_iommu && max_possible_pfn > MAX_DMA32_PFN)
x86_swiotlb_enable = true;
/*
* 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))
x86_swiotlb_enable = true;
/*
* Guest with guest memory encryption currently perform all DMA through
* bounce buffers as the hypervisor can't access arbitrary VM memory
* that is not explicitly shared with it.
*/
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
x86_swiotlb_enable = true;
x86_swiotlb_flags |= SWIOTLB_FORCE;
}
}
#else
static inline void __init pci_swiotlb_detect(void)
{
}
#define x86_swiotlb_flags 0
#endif /* CONFIG_SWIOTLB */
#ifdef CONFIG_SWIOTLB_XEN
static void __init pci_xen_swiotlb_init(void)
{
if (!xen_initial_domain() && !x86_swiotlb_enable)
return;
x86_swiotlb_enable = true;
x86_swiotlb_flags |= SWIOTLB_ANY;
swiotlb_init_remap(true, x86_swiotlb_flags, xen_swiotlb_fixup);
dma_ops = &xen_swiotlb_dma_ops;
if (IS_ENABLED(CONFIG_PCI))
pci_request_acs();
}
int pci_xen_swiotlb_init_late(void)
{
if (dma_ops == &xen_swiotlb_dma_ops)
return 0;
/* we can work with the default swiotlb */
if (!io_tlb_default_mem.nslabs) {
int rc = swiotlb_init_late(swiotlb_size_or_default(),
GFP_KERNEL, xen_swiotlb_fixup);
if (rc < 0)
return rc;
}
/* XXX: this switches the dma ops under live devices! */
dma_ops = &xen_swiotlb_dma_ops;
if (IS_ENABLED(CONFIG_PCI))
pci_request_acs();
return 0;
}
EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
#else
static inline void __init pci_xen_swiotlb_init(void)
{
}
#endif /* CONFIG_SWIOTLB_XEN */
void __init pci_iommu_alloc(void)
{
struct iommu_table_entry *p;
sort_iommu_table(__iommu_table, __iommu_table_end);
check_iommu_entries(__iommu_table, __iommu_table_end);
for (p = __iommu_table; p < __iommu_table_end; p++) {
if (p && p->detect && p->detect() > 0) {
p->flags |= IOMMU_DETECTED;
if (p->early_init)
p->early_init();
if (p->flags & IOMMU_FINISH_IF_DETECTED)
break;
}
if (xen_pv_domain()) {
pci_xen_swiotlb_init();
return;
}
pci_swiotlb_detect();
gart_iommu_hole_init();
amd_iommu_detect();
detect_intel_iommu();
swiotlb_init(x86_swiotlb_enable, x86_swiotlb_flags);
}
/*
@ -102,7 +171,7 @@ static __init int iommu_setup(char *p)
}
#ifdef CONFIG_SWIOTLB
if (!strncmp(p, "soft", 4))
swiotlb = 1;
x86_swiotlb_enable = true;
#endif
if (!strncmp(p, "pt", 2))
iommu_set_default_passthrough(true);
@ -121,14 +190,17 @@ early_param("iommu", iommu_setup);
static int __init pci_iommu_init(void)
{
struct iommu_table_entry *p;
x86_init.iommu.iommu_init();
for (p = __iommu_table; p < __iommu_table_end; p++) {
if (p && (p->flags & IOMMU_DETECTED) && p->late_init)
p->late_init();
#ifdef CONFIG_SWIOTLB
/* An IOMMU turned us off. */
if (x86_swiotlb_enable) {
pr_info("PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
swiotlb_print_info();
} else {
swiotlb_exit();
}
#endif
return 0;
}

77
arch/x86/kernel/pci-iommu_table.c
View File

@ -1,77 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/dma-mapping.h>
#include <asm/iommu_table.h>
#include <linux/string.h>
#include <linux/kallsyms.h>
static struct iommu_table_entry * __init
find_dependents_of(struct iommu_table_entry *start,
struct iommu_table_entry *finish,
struct iommu_table_entry *q)
{
struct iommu_table_entry *p;
if (!q)
return NULL;
for (p = start; p < finish; p++)
if (p->detect == q->depend)
return p;
return NULL;
}
void __init sort_iommu_table(struct iommu_table_entry *start,
struct iommu_table_entry *finish) {
struct iommu_table_entry *p, *q, tmp;
for (p = start; p < finish; p++) {
again:
q = find_dependents_of(start, finish, p);
/* We are bit sneaky here. We use the memory address to figure
* out if the node we depend on is past our point, if so, swap.
*/
if (q > p) {
tmp = *p;
memmove(p, q, sizeof(*p));
*q = tmp;
goto again;
}
}
}
#ifdef DEBUG
void __init check_iommu_entries(struct iommu_table_entry *start,
struct iommu_table_entry *finish)
{
struct iommu_table_entry *p, *q, *x;
/* Simple cyclic dependency checker. */
for (p = start; p < finish; p++) {
q = find_dependents_of(start, finish, p);
x = find_dependents_of(start, finish, q);
if (p == x) {
printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n",
p->detect, q->detect);
/* Heavy handed way..*/
x->depend = NULL;
}
}
for (p = start; p < finish; p++) {
q = find_dependents_of(p, finish, p);
if (q && q > p) {
printk(KERN_ERR "EXECUTION ORDER INVALID! %pS should be called before %pS!\n",
p->detect, q->detect);
}
}
}
#else
void __init check_iommu_entries(struct iommu_table_entry *start,
struct iommu_table_entry *finish)
{
}
#endif

77
arch/x86/kernel/pci-swiotlb.c
View File

@ -1,77 +0,0 @@
// 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();
}
}

1
arch/x86/kernel/tboot.c
View File

@ -24,7 +24,6 @@
#include <asm/processor.h>
#include <asm/bootparam.h>
#include <asm/pgalloc.h>
#include <asm/swiotlb.h>
#include <asm/fixmap.h>
#include <asm/proto.h>
#include <asm/setup.h>

12
arch/x86/kernel/vmlinux.lds.S
View File

@ -315,18 +315,6 @@ SECTIONS
*(.altinstr_replacement)
}
/*
* struct iommu_table_entry entries are injected in this section.
* It is an array of IOMMUs which during run time gets sorted depending
* on its dependency order. After rootfs_initcall is complete
* this section can be safely removed.
*/
.iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
__iommu_table = .;
*(.iommu_table)
__iommu_table_end = .;
}
. = ALIGN(8);
.apicdrivers : AT(ADDR(.apicdrivers) - LOAD_OFFSET) {
__apicdrivers = .;

3
arch/x86/mm/mem_encrypt_amd.c
View File

@ -495,9 +495,6 @@ void __init sme_early_init(void)
for (i = 0; i < ARRAY_SIZE(protection_map); i++)
protection_map[i] = pgprot_encrypted(protection_map[i]);
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
swiotlb_force = SWIOTLB_FORCE;
x86_platform.guest.enc_status_change_prepare = amd_enc_status_change_prepare;
x86_platform.guest.enc_status_change_finish = amd_enc_status_change_finish;
x86_platform.guest.enc_tlb_flush_required = amd_enc_tlb_flush_required;

2
arch/x86/pci/sta2x11-fixup.c
View File

@ -57,7 +57,7 @@ static void sta2x11_new_instance(struct pci_dev *pdev)
int size = STA2X11_SWIOTLB_SIZE;
/* First instance: register your own swiotlb area */
dev_info(&pdev->dev, "Using SWIOTLB (size %i)\n", size);
if (swiotlb_late_init_with_default_size(size))
if (swiotlb_init_late(size, GFP_DMA, NULL))
dev_emerg(&pdev->dev, "init swiotlb failed\n");
}
list_add(&instance->list, &sta2x11_instance_list);

2
arch/x86/xen/Makefile
View File

@ -47,6 +47,4 @@ obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
obj-$(CONFIG_XEN_PV_DOM0) += vga.o
obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
obj-$(CONFIG_XEN_EFI) += efi.o

1
arch/x86/xen/mmu_pv.c
View File

@ -80,6 +80,7 @@
#include <xen/interface/version.h>
#include <xen/interface/memory.h>
#include <xen/hvc-console.h>
#include <xen/swiotlb-xen.h>
#include "multicalls.h"
#include "mmu.h"

96
arch/x86/xen/pci-swiotlb-xen.c
View File

@ -1,96 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/* Glue code to lib/swiotlb-xen.c */
#include <linux/dma-map-ops.h>
#include <linux/pci.h>
#include <xen/swiotlb-xen.h>
#include <asm/xen/hypervisor.h>
#include <xen/xen.h>
#include <asm/iommu_table.h>
#include <asm/xen/swiotlb-xen.h>
#ifdef CONFIG_X86_64
#include <asm/iommu.h>
#include <asm/dma.h>
#endif
#include <linux/export.h>
static int xen_swiotlb __read_mostly;
/*
* pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
*
* This returns non-zero if we are forced to use xen_swiotlb (by the boot
* option).
*/
int __init pci_xen_swiotlb_detect(void)
{
if (!xen_pv_domain())
return 0;
/* If running as PV guest, either iommu=soft, or swiotlb=force will
* activate this IOMMU. If running as PV privileged, activate it
* irregardless.
*/
if (xen_initial_domain() || swiotlb || swiotlb_force == SWIOTLB_FORCE)
xen_swiotlb = 1;
/* If we are running under Xen, we MUST disable the native SWIOTLB.
* Don't worry about swiotlb_force flag activating the native, as
* the 'swiotlb' flag is the only one turning it on. */
swiotlb = 0;
#ifdef CONFIG_X86_64
/* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0
* (so no iommu=X command line over-writes).
* Considering that PV guests do not want the *native SWIOTLB* but
* only Xen SWIOTLB it is not useful to us so set no_iommu=1 here.
*/
if (max_pfn > MAX_DMA32_PFN)
no_iommu = 1;
#endif
return xen_swiotlb;
}
static void __init pci_xen_swiotlb_init(void)
{
if (xen_swiotlb) {
xen_swiotlb_init_early();
dma_ops = &xen_swiotlb_dma_ops;
#ifdef CONFIG_PCI
/* Make sure ACS will be enabled */
pci_request_acs();
#endif
}
}
int pci_xen_swiotlb_init_late(void)
{
int rc;
if (xen_swiotlb)
return 0;
rc = xen_swiotlb_init();
if (rc)
return rc;
dma_ops = &xen_swiotlb_dma_ops;
#ifdef CONFIG_PCI
/* Make sure ACS will be enabled */
pci_request_acs();
#endif
return 0;
}
EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late);
IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
NULL,
pci_xen_swiotlb_init,
NULL);

6
drivers/iommu/amd/init.c
View File

@ -27,7 +27,6 @@
#include <asm/apic.h>
#include <asm/gart.h>
#include <asm/x86_init.h>
#include <asm/iommu_table.h>
#include <asm/io_apic.h>
#include <asm/irq_remapping.h>
#include <asm/set_memory.h>
@ -3257,11 +3256,6 @@ __setup("ivrs_ioapic", parse_ivrs_ioapic);
__setup("ivrs_hpet", parse_ivrs_hpet);
__setup("ivrs_acpihid", parse_ivrs_acpihid);
IOMMU_INIT_FINISH(amd_iommu_detect,
gart_iommu_hole_init,
NULL,
NULL);
bool amd_iommu_v2_supported(void)
{
return amd_iommu_v2_present;

5
drivers/iommu/amd/iommu.c
View File

@ -1840,7 +1840,10 @@ void amd_iommu_domain_update(struct protection_domain *domain)
static void __init amd_iommu_init_dma_ops(void)
{
swiotlb = (iommu_default_passthrough() || sme_me_mask) ? 1 : 0;
if (iommu_default_passthrough() || sme_me_mask)
x86_swiotlb_enable = true;
else
x86_swiotlb_enable = false;
}
int __init amd_iommu_init_api(void)

6
drivers/iommu/intel/dmar.c
View File

@ -30,7 +30,6 @@
#include <linux/numa.h>
#include <linux/limits.h>
#include <asm/irq_remapping.h>
#include <asm/iommu_table.h>
#include <trace/events/intel_iommu.h>
#include "../irq_remapping.h"
@ -912,7 +911,7 @@ dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg)
return 0;
}
int __init detect_intel_iommu(void)
void __init detect_intel_iommu(void)
{
int ret;
struct dmar_res_callback validate_drhd_cb = {
@ -945,8 +944,6 @@ int __init detect_intel_iommu(void)
dmar_tbl = NULL;
}
up_write(&dmar_global_lock);
return ret ? ret : 1;
}
static void unmap_iommu(struct intel_iommu *iommu)
@ -2164,7 +2161,6 @@ static int __init dmar_free_unused_resources(void)
}
late_initcall(dmar_free_unused_resources);
IOMMU_INIT_POST(detect_intel_iommu);
/*
* DMAR Hotplug Support

229
drivers/xen/swiotlb-xen.c
View File

@ -36,7 +36,6 @@
#include <xen/hvc-console.h>
#include <asm/dma-mapping.h>
#include <asm/xen/page-coherent.h>
#include <trace/events/swiotlb.h>
#define MAX_DMA_BITS 32
@ -104,7 +103,8 @@ static int is_xen_swiotlb_buffer(struct device *dev, dma_addr_t dma_addr)
return 0;
}
static int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
#ifdef CONFIG_X86
int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
{
int rc;
unsigned int order = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT);
@ -130,223 +130,59 @@ static int xen_swiotlb_fixup(void *buf, unsigned long nslabs)
return 0;
}
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 "";
}
int xen_swiotlb_init(void)
{
enum xen_swiotlb_err m_ret = XEN_SWIOTLB_UNKNOWN;
unsigned long bytes = swiotlb_size_or_default();
unsigned long nslabs = bytes >> IO_TLB_SHIFT;
unsigned int order, repeat = 3;
int rc = -ENOMEM;
char *start;
if (io_tlb_default_mem.nslabs) {
pr_warn("swiotlb buffer already initialized\n");
return -EEXIST;
}
retry:
m_ret = XEN_SWIOTLB_ENOMEM;
order = get_order(bytes);
/*
* Get IO TLB memory from any location.
*/
#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) {
start = (void *)xen_get_swiotlb_free_pages(order);
if (start)
break;
order--;
}
if (!start)
goto exit;
if (order != get_order(bytes)) {
pr_warn("Warning: only able to allocate %ld MB for software IO TLB\n",
(PAGE_SIZE << order) >> 20);
nslabs = SLABS_PER_PAGE << order;
bytes = nslabs << IO_TLB_SHIFT;
}
/*
* And replace that memory with pages under 4GB.
*/
rc = xen_swiotlb_fixup(start, nslabs);
if (rc) {
free_pages((unsigned long)start, order);
m_ret = XEN_SWIOTLB_EFIXUP;
goto error;
}
rc = swiotlb_late_init_with_tbl(start, nslabs);
if (rc)
return rc;
swiotlb_set_max_segment(PAGE_SIZE);
return 0;
error:
if (nslabs > 1024 && repeat--) {
/* Min is 2MB */
nslabs = max(1024UL, ALIGN(nslabs >> 1, IO_TLB_SEGSIZE));
bytes = nslabs << IO_TLB_SHIFT;
pr_info("Lowering to %luMB\n", bytes >> 20);
goto retry;
}
exit:
pr_err("%s (rc:%d)\n", xen_swiotlb_error(m_ret), rc);
return rc;
}
#ifdef CONFIG_X86
void __init xen_swiotlb_init_early(void)
{
unsigned long bytes = swiotlb_size_or_default();
unsigned long nslabs = bytes >> IO_TLB_SHIFT;
unsigned int repeat = 3;
char *start;
int rc;
retry:
/*
* Get IO TLB memory from any location.
*/
start = memblock_alloc(PAGE_ALIGN(bytes),
IO_TLB_SEGSIZE << IO_TLB_SHIFT);
if (!start)
panic("%s: Failed to allocate %lu bytes\n",
__func__, PAGE_ALIGN(bytes));
/*
* And replace that memory with pages under 4GB.
*/
rc = xen_swiotlb_fixup(start, nslabs);
if (rc) {
memblock_free(start, PAGE_ALIGN(bytes));
if (nslabs > 1024 && repeat--) {
/* Min is 2MB */
nslabs = max(1024UL, ALIGN(nslabs >> 1, IO_TLB_SEGSIZE));
bytes = nslabs << IO_TLB_SHIFT;
pr_info("Lowering to %luMB\n", bytes >> 20);
goto retry;
}
panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
}
if (swiotlb_init_with_tbl(start, nslabs, true))
panic("Cannot allocate SWIOTLB buffer");
swiotlb_set_max_segment(PAGE_SIZE);
}
#endif /* CONFIG_X86 */
static void *
xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
unsigned long attrs)
xen_swiotlb_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
{
void *ret;
u64 dma_mask = dev->coherent_dma_mask;
int order = get_order(size);
u64 dma_mask = DMA_BIT_MASK(32);
phys_addr_t phys;
dma_addr_t dev_addr;
void *ret;
/*
* Ignore region specifiers - the kernel's ideas of
* pseudo-phys memory layout has nothing to do with the
* machine physical layout. We can't allocate highmem
* because we can't return a pointer to it.
*/
flags &= ~(__GFP_DMA | __GFP_HIGHMEM);
/* Convert the size to actually allocated. */
/* Align the allocation to the Xen page size */
size = 1UL << (order + XEN_PAGE_SHIFT);
/* On ARM this function returns an ioremap'ped virtual address for
* which virt_to_phys doesn't return the corresponding physical
* address. In fact on ARM virt_to_phys only works for kernel direct
* mapped RAM memory. Also see comment below.
*/
ret = xen_alloc_coherent_pages(hwdev, size, dma_handle, flags, attrs);
ret = (void *)__get_free_pages(flags, get_order(size));
if (!ret)
return ret;
phys = virt_to_phys(ret);
if (hwdev && hwdev->coherent_dma_mask)
dma_mask = hwdev->coherent_dma_mask;
/* At this point dma_handle is the dma address, next we are
* going to set it to the machine address.
* Do not use virt_to_phys(ret) because on ARM it doesn't correspond
* to *dma_handle. */
phys = dma_to_phys(hwdev, *dma_handle);
dev_addr = xen_phys_to_dma(hwdev, phys);
if (((dev_addr + size - 1 <= dma_mask)) &&
!range_straddles_page_boundary(phys, size))
*dma_handle = dev_addr;
else {
if (xen_create_contiguous_region(phys, order,
fls64(dma_mask), dma_handle) != 0) {
xen_free_coherent_pages(hwdev, size, ret, (dma_addr_t)phys, attrs);
return NULL;
}
*dma_handle = phys_to_dma(hwdev, *dma_handle);
*dma_handle = xen_phys_to_dma(dev, phys);
if (*dma_handle + size - 1 > dma_mask ||
range_straddles_page_boundary(phys, size)) {
if (xen_create_contiguous_region(phys, order, fls64(dma_mask),
dma_handle) != 0)
goto out_free_pages;
SetPageXenRemapped(virt_to_page(ret));
}
memset(ret, 0, size);
return ret;
out_free_pages:
free_pages((unsigned long)ret, get_order(size));
return NULL;
}
static void
xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
dma_addr_t dev_addr, unsigned long attrs)
xen_swiotlb_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
phys_addr_t phys = virt_to_phys(vaddr);
int order = get_order(size);
phys_addr_t phys;
u64 dma_mask = DMA_BIT_MASK(32);
struct page *page;
if (hwdev && hwdev->coherent_dma_mask)
dma_mask = hwdev->coherent_dma_mask;
/* do not use virt_to_phys because on ARM it doesn't return you the
* physical address */
phys = xen_dma_to_phys(hwdev, dev_addr);
/* Convert the size to actually allocated. */
size = 1UL << (order + XEN_PAGE_SHIFT);
if (is_vmalloc_addr(vaddr))
page = vmalloc_to_page(vaddr);
else
page = virt_to_page(vaddr);
if (WARN_ON_ONCE(dma_handle + size - 1 > dev->coherent_dma_mask) ||
WARN_ON_ONCE(range_straddles_page_boundary(phys, size)))
return;
if (!WARN_ON((dev_addr + size - 1 > dma_mask) ||
range_straddles_page_boundary(phys, size)) &&
TestClearPageXenRemapped(page))
if (TestClearPageXenRemapped(virt_to_page(vaddr)))
xen_destroy_contiguous_region(phys, order);
xen_free_coherent_pages(hwdev, size, vaddr, phys_to_dma(hwdev, phys),
attrs);
free_pages((unsigned long)vaddr, get_order(size));
}
#endif /* CONFIG_X86 */
/*
* Map a single buffer of the indicated size for DMA in streaming mode. The
@ -378,7 +214,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
/*
* Oh well, have to allocate and map a bounce buffer.
*/
trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
trace_swiotlb_bounced(dev, dev_addr, size);
map = swiotlb_tbl_map_single(dev, phys, size, size, 0, dir, attrs);
if (map == (phys_addr_t)DMA_MAPPING_ERROR)
@ -549,8 +385,13 @@ xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
}
const struct dma_map_ops xen_swiotlb_dma_ops = {
#ifdef CONFIG_X86
.alloc = xen_swiotlb_alloc_coherent,
.free = xen_swiotlb_free_coherent,
#else
.alloc = dma_direct_alloc,
.free = dma_direct_free,
#endif
.sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
.sync_single_for_device = xen_swiotlb_sync_single_for_device,
.sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,

6
include/linux/dmar.h
View File

@ -121,7 +121,7 @@ extern int dmar_remove_dev_scope(struct dmar_pci_notify_info *info,
u16 segment, struct dmar_dev_scope *devices,
int count);
/* Intel IOMMU detection */
extern int detect_intel_iommu(void);
void detect_intel_iommu(void);
extern int enable_drhd_fault_handling(void);
extern int dmar_device_add(acpi_handle handle);
extern int dmar_device_remove(acpi_handle handle);
@ -197,6 +197,10 @@ static inline bool dmar_platform_optin(void)
return false;
}
static inline void detect_intel_iommu(void)
{
}
#endif /* CONFIG_DMAR_TABLE */
struct irte {

22
include/linux/swiotlb.h
View File

@ -13,11 +13,9 @@ struct device;
struct page;
struct scatterlist;
enum swiotlb_force {
SWIOTLB_NORMAL, /* Default - depending on HW DMA mask etc. */
SWIOTLB_FORCE, /* swiotlb=force */
SWIOTLB_NO_FORCE, /* swiotlb=noforce */
};
#define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */
#define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */
#define SWIOTLB_ANY (1 << 2) /* allow any memory for the buffer */
/*
* Maximum allowable number of contiguous slabs to map,
@ -36,11 +34,11 @@ enum swiotlb_force {
/* default to 64MB */
#define IO_TLB_DEFAULT_SIZE (64UL<<20)
extern void swiotlb_init(int verbose);
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
extern int swiotlb_late_init_with_default_size(size_t default_size);
void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
int (*remap)(void *tlb, unsigned long nslabs));
int swiotlb_init_late(size_t size, gfp_t gfp_mask,
int (*remap)(void *tlb, unsigned long nslabs));
extern void __init swiotlb_update_mem_attributes(void);
phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
@ -126,13 +124,16 @@ static inline bool is_swiotlb_force_bounce(struct device *dev)
return mem && mem->force_bounce;
}
void swiotlb_init(bool addressing_limited, unsigned int flags);
void __init swiotlb_exit(void);
unsigned int swiotlb_max_segment(void);
size_t swiotlb_max_mapping_size(struct device *dev);
bool is_swiotlb_active(struct device *dev);
void __init swiotlb_adjust_size(unsigned long size);
#else
#define swiotlb_force SWIOTLB_NO_FORCE
static inline void swiotlb_init(bool addressing_limited, unsigned int flags)
{
}
static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr)
{
return false;
@ -164,7 +165,6 @@ static inline void swiotlb_adjust_size(unsigned long size)
#endif /* CONFIG_SWIOTLB */
extern void swiotlb_print_info(void);
extern void swiotlb_set_max_segment(unsigned int);
#ifdef CONFIG_DMA_RESTRICTED_POOL
struct page *swiotlb_alloc(struct device *dev, size_t size);

29
include/trace/events/swiotlb.h
View File

@ -8,20 +8,15 @@
#include <linux/tracepoint.h>
TRACE_EVENT(swiotlb_bounced,
TP_PROTO(struct device *dev,
dma_addr_t dev_addr,
size_t size,
enum swiotlb_force swiotlb_force),
TP_ARGS(dev, dev_addr, size, swiotlb_force),
TP_PROTO(struct device *dev, dma_addr_t dev_addr, size_t size),
TP_ARGS(dev, dev_addr, size),
TP_STRUCT__entry(
__string( dev_name, dev_name(dev) )
__field( u64, dma_mask )
__field( dma_addr_t, dev_addr )
__field( size_t, size )
__field( enum swiotlb_force, swiotlb_force )
__string(dev_name, dev_name(dev))
__field(u64, dma_mask)
__field(dma_addr_t, dev_addr)
__field(size_t, size)
__field(bool, force)
),
TP_fast_assign(
@ -29,19 +24,15 @@ TRACE_EVENT(swiotlb_bounced,
__entry->dma_mask = (dev->dma_mask ? *dev->dma_mask : 0);
__entry->dev_addr = dev_addr;
__entry->size = size;
__entry->swiotlb_force = swiotlb_force;
__entry->force = is_swiotlb_force_bounce(dev);
),
TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx "
"size=%zu %s",
TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx size=%zu %s",
__get_str(dev_name),
__entry->dma_mask,
(unsigned long long)__entry->dev_addr,
__entry->size,
__print_symbolic(__entry->swiotlb_force,
{ SWIOTLB_NORMAL, "NORMAL" },
{ SWIOTLB_FORCE, "FORCE" },
{ SWIOTLB_NO_FORCE, "NO_FORCE" }))
__entry->force ? "FORCE" : "NORMAL")
);
#endif /* _TRACE_SWIOTLB_H */

20
include/xen/arm/page-coherent.h
View File

@ -1,20 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _XEN_ARM_PAGE_COHERENT_H
#define _XEN_ARM_PAGE_COHERENT_H
#include <linux/dma-mapping.h>
#include <asm/page.h>
static inline void *xen_alloc_coherent_pages(struct device *hwdev, size_t size,
dma_addr_t *dma_handle, gfp_t flags, unsigned long attrs)
{
return dma_direct_alloc(hwdev, size, dma_handle, flags, attrs);
}
static inline void xen_free_coherent_pages(struct device *hwdev, size_t size,
void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs)
{
dma_direct_free(hwdev, size, cpu_addr, dma_handle, attrs);
}
#endif /* _XEN_ARM_PAGE_COHERENT_H */

1
include/xen/arm/page.h
View File

@ -115,6 +115,5 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
bool xen_arch_need_swiotlb(struct device *dev,
phys_addr_t phys,
dma_addr_t dev_addr);
unsigned long xen_get_swiotlb_free_pages(unsigned int order);
#endif /* _ASM_ARM_XEN_PAGE_H */

2
include/xen/swiotlb-xen.h
View File

@ -10,8 +10,6 @@ void xen_dma_sync_for_cpu(struct device *dev, dma_addr_t handle,
void xen_dma_sync_for_device(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir);
int xen_swiotlb_init(void);
void __init xen_swiotlb_init_early(void);
extern const struct dma_map_ops xen_swiotlb_dma_ops;
#endif /* __LINUX_SWIOTLB_XEN_H */

7
include/xen/xen-ops.h
View File

@ -42,13 +42,6 @@ int xen_setup_shutdown_event(void);
extern unsigned long *xen_contiguous_bitmap;
#if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64)
int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
unsigned int address_bits,
dma_addr_t *dma_handle);
void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
#endif
#if defined(CONFIG_XEN_PV)
int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
xen_pfn_t *pfn, int nr, int *err_ptr, pgprot_t prot,

2
kernel/dma/debug.c
View File

@ -448,7 +448,7 @@ void debug_dma_dump_mappings(struct device *dev)
* other hand, consumes a single dma_debug_entry, but inserts 'nents'
* entries into the tree.
*/
static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
static RADIX_TREE(dma_active_cacheline, GFP_ATOMIC);
static DEFINE_SPINLOCK(radix_lock);
#define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
#define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT)

31
kernel/dma/direct.c
View File

@ -79,7 +79,7 @@ static int dma_set_decrypted(struct device *dev, void *vaddr, size_t size)
{
if (!force_dma_unencrypted(dev))
return 0;
return set_memory_decrypted((unsigned long)vaddr, 1 << get_order(size));
return set_memory_decrypted((unsigned long)vaddr, PFN_UP(size));
}
static int dma_set_encrypted(struct device *dev, void *vaddr, size_t size)
@ -88,7 +88,7 @@ static int dma_set_encrypted(struct device *dev, void *vaddr, size_t size)
if (!force_dma_unencrypted(dev))
return 0;
ret = set_memory_encrypted((unsigned long)vaddr, 1 << get_order(size));
ret = set_memory_encrypted((unsigned long)vaddr, PFN_UP(size));
if (ret)
pr_warn_ratelimited("leaking DMA memory that can't be re-encrypted\n");
return ret;
@ -115,7 +115,7 @@ static struct page *dma_direct_alloc_swiotlb(struct device *dev, size_t size)
}
static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
gfp_t gfp)
gfp_t gfp, bool allow_highmem)
{
int node = dev_to_node(dev);
struct page *page = NULL;
@ -129,9 +129,12 @@ static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
&phys_limit);
page = dma_alloc_contiguous(dev, size, gfp);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_free_contiguous(dev, page, size);
page = NULL;
if (page) {
if (!dma_coherent_ok(dev, page_to_phys(page), size) ||
(!allow_highmem && PageHighMem(page))) {
dma_free_contiguous(dev, page, size);
page = NULL;
}
}
again:
if (!page)
@ -189,7 +192,7 @@ static void *dma_direct_alloc_no_mapping(struct device *dev, size_t size,
{
struct page *page;
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO, true);
if (!page)
return NULL;
@ -262,7 +265,7 @@ void *dma_direct_alloc(struct device *dev, size_t size,
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
/* we always manually zero the memory once we are done */
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO);
page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO, true);
if (!page)
return NULL;
@ -370,19 +373,9 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
if (force_dma_unencrypted(dev) && dma_direct_use_pool(dev, gfp))
return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp);
page = __dma_direct_alloc_pages(dev, size, gfp);
page = __dma_direct_alloc_pages(dev, size, gfp, false);
if (!page)
return NULL;
if (PageHighMem(page)) {
/*
* Depending on the cma= arguments and per-arch setup
* dma_alloc_contiguous could return highmem pages.
* Without remapping there is no way to return them here,
* so log an error and fail.
*/
dev_info(dev, "Rejecting highmem page from CMA.\n");
goto out_free_pages;
}
ret = page_address(page);
if (dma_set_decrypted(dev, ret, size))

2
kernel/dma/direct.h
View File

@ -91,7 +91,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
return swiotlb_map(dev, phys, size, dir, attrs);
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
if (swiotlb_force != SWIOTLB_NO_FORCE)
if (is_swiotlb_active(dev))
return swiotlb_map(dev, phys, size, dir, attrs);
dev_WARN_ONCE(dev, 1,

186
kernel/dma/swiotlb.c
View File

@ -62,18 +62,13 @@
#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
enum swiotlb_force swiotlb_force;
static bool swiotlb_force_bounce;
static bool swiotlb_force_disable;
struct io_tlb_mem io_tlb_default_mem;
phys_addr_t swiotlb_unencrypted_base;
/*
* Max segment that we can provide which (if pages are contingous) will
* not be bounced (unless SWIOTLB_FORCE is set).
*/
static unsigned int max_segment;
static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
static int __init
@ -87,9 +82,9 @@ setup_io_tlb_npages(char *str)
if (*str == ',')
++str;
if (!strcmp(str, "force"))
swiotlb_force = SWIOTLB_FORCE;
swiotlb_force_bounce = true;
else if (!strcmp(str, "noforce"))
swiotlb_force = SWIOTLB_NO_FORCE;
swiotlb_force_disable = true;
return 0;
}
@ -97,18 +92,12 @@ early_param("swiotlb", setup_io_tlb_npages);
unsigned int swiotlb_max_segment(void)
{
return io_tlb_default_mem.nslabs ? max_segment : 0;
if (!io_tlb_default_mem.nslabs)
return 0;
return rounddown(io_tlb_default_mem.nslabs << IO_TLB_SHIFT, PAGE_SIZE);
}
EXPORT_SYMBOL_GPL(swiotlb_max_segment);
void swiotlb_set_max_segment(unsigned int val)
{
if (swiotlb_force == SWIOTLB_FORCE)
max_segment = 1;
else
max_segment = rounddown(val, PAGE_SIZE);
}
unsigned long swiotlb_size_or_default(void)
{
return default_nslabs << IO_TLB_SHIFT;
@ -214,7 +203,7 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
mem->index = 0;
mem->late_alloc = late_alloc;
if (swiotlb_force == SWIOTLB_FORCE)
if (swiotlb_force_bounce)
mem->force_bounce = true;
spin_lock_init(&mem->lock);
@ -236,17 +225,49 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
return;
}
int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
int (*remap)(void *tlb, unsigned long nslabs))
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long nslabs = default_nslabs;
size_t alloc_size;
size_t bytes;
void *tlb;
if (swiotlb_force == SWIOTLB_NO_FORCE)
return 0;
if (!addressing_limit && !swiotlb_force_bounce)
return;
if (swiotlb_force_disable)
return;
/* protect against double initialization */
if (WARN_ON_ONCE(mem->nslabs))
return -ENOMEM;
/*
* By default allocate the bounce buffer memory from low memory, but
* allow to pick a location everywhere for hypervisors with guest
* memory encryption.
*/
retry:
bytes = PAGE_ALIGN(nslabs << IO_TLB_SHIFT);
if (flags & SWIOTLB_ANY)
tlb = memblock_alloc(bytes, PAGE_SIZE);
else
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb) {
pr_warn("%s: failed to allocate tlb structure\n", __func__);
return;
}
if (remap && remap(tlb, nslabs) < 0) {
memblock_free(tlb, PAGE_ALIGN(bytes));
nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
if (nslabs < IO_TLB_MIN_SLABS)
panic("%s: Failed to remap %zu bytes\n",
__func__, bytes);
goto retry;
}
alloc_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), nslabs));
mem->slots = memblock_alloc(alloc_size, PAGE_SIZE);
@ -255,38 +276,15 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
__func__, alloc_size, PAGE_SIZE);
swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
mem->force_bounce = flags & SWIOTLB_FORCE;
if (verbose)
if (flags & SWIOTLB_VERBOSE)
swiotlb_print_info();
swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
}
/*
* Statically reserve bounce buffer space and initialize bounce buffer data
* structures for the software IO TLB used to implement the DMA API.
*/
void __init
swiotlb_init(int verbose)
void __init swiotlb_init(bool addressing_limit, unsigned int flags)
{
size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT);
void *tlb;
if (swiotlb_force == SWIOTLB_NO_FORCE)
return;
/* Get IO TLB memory from the low pages */
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb)
goto fail;
if (swiotlb_init_with_tbl(tlb, default_nslabs, verbose))
goto fail_free_mem;
return;
fail_free_mem:
memblock_free(tlb, bytes);
fail:
pr_warn("Cannot allocate buffer");
return swiotlb_init_remap(addressing_limit, flags, NULL);
}
/*
@ -294,72 +292,65 @@ swiotlb_init(int verbose)
* initialize the swiotlb later using the slab allocator if needed.
* This should be just like above, but with some error catching.
*/
int
swiotlb_late_init_with_default_size(size_t default_size)
int swiotlb_init_late(size_t size, gfp_t gfp_mask,
int (*remap)(void *tlb, unsigned long nslabs))
{
unsigned long nslabs =
ALIGN(default_size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
unsigned long bytes;
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
unsigned char *vstart = NULL;
unsigned int order;
bool retried = false;
int rc = 0;
if (swiotlb_force == SWIOTLB_NO_FORCE)
if (swiotlb_force_disable)
return 0;
/*
* Get IO TLB memory from the low pages
*/
retry:
order = get_order(nslabs << IO_TLB_SHIFT);
nslabs = SLABS_PER_PAGE << order;
bytes = nslabs << IO_TLB_SHIFT;
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
vstart = (void *)__get_free_pages(gfp_mask | __GFP_NOWARN,
order);
if (vstart)
break;
order--;
nslabs = SLABS_PER_PAGE << order;
retried = true;
}
if (!vstart)
return -ENOMEM;
if (order != get_order(bytes)) {
pr_warn("only able to allocate %ld MB\n",
(PAGE_SIZE << order) >> 20);
nslabs = SLABS_PER_PAGE << order;
}
rc = swiotlb_late_init_with_tbl(vstart, nslabs);
if (rc)
if (remap)
rc = remap(vstart, nslabs);
if (rc) {
free_pages((unsigned long)vstart, order);
return rc;
}
nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
if (nslabs < IO_TLB_MIN_SLABS)
return rc;
retried = true;
goto retry;
}
int
swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
unsigned long bytes = nslabs << IO_TLB_SHIFT;
if (swiotlb_force == SWIOTLB_NO_FORCE)
return 0;
/* protect against double initialization */
if (WARN_ON_ONCE(mem->nslabs))
return -ENOMEM;
if (retried) {
pr_warn("only able to allocate %ld MB\n",
(PAGE_SIZE << order) >> 20);
}
mem->slots = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
get_order(array_size(sizeof(*mem->slots), nslabs)));
if (!mem->slots)
if (!mem->slots) {
free_pages((unsigned long)vstart, order);
return -ENOMEM;
}
set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
set_memory_decrypted((unsigned long)vstart,
(nslabs << IO_TLB_SHIFT) >> PAGE_SHIFT);
swiotlb_init_io_tlb_mem(mem, virt_to_phys(vstart), nslabs, true);
swiotlb_print_info();
swiotlb_set_max_segment(mem->nslabs << IO_TLB_SHIFT);
return 0;
}
@ -369,6 +360,9 @@ void __init swiotlb_exit(void)
unsigned long tbl_vaddr;
size_t tbl_size, slots_size;
if (swiotlb_force_bounce)
return;
if (!mem->nslabs)
return;
@ -717,8 +711,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
phys_addr_t swiotlb_addr;
dma_addr_t dma_addr;
trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size,
swiotlb_force);
trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size);
swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, 0, dir,
attrs);
@ -743,7 +736,18 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
size_t swiotlb_max_mapping_size(struct device *dev)
{
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE;
int min_align_mask = dma_get_min_align_mask(dev);
int min_align = 0;
/*
* swiotlb_find_slots() skips slots according to
* min align mask. This affects max mapping size.
* Take it into acount here.
*/
if (min_align_mask)
min_align = roundup(min_align_mask, IO_TLB_SIZE);
return ((size_t)IO_TLB_SIZE) * IO_TLB_SEGSIZE - min_align;
}
bool is_swiotlb_active(struct device *dev)