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swiotlb: make the swiotlb_init interface more useful

Browse source 
Pass a boolean flag to indicate if swiotlb needs to be enabled based on
the addressing needs, and replace the verbose argument with a set of
flags, including one to force enable bounce buffering.

Note that this patch removes the possibility to force xen-swiotlb use
with the swiotlb=force parameter on the command line on x86 (arm and
arm64 never supported that), but this interface will be restored shortly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Christoph Hellwig 2022-03-29 17:27:33 +02:00
parent a3e2309267
commit c6af2aa9ff
15 changed files with 55 additions and 82 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

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);

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

@ -398,11 +398,7 @@ 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();

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

2
arch/mips/cavium-octeon/dma-octeon.c
View file

@ -235,5 +235,5 @@ void __init plat_swiotlb_setup(void)
#endif
swiotlb_adjust_size(swiotlbsize);
swiotlb_init(1);
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/sibyte/common/dma.c
View file

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

3
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>
@ -251,7 +252,7 @@ void __init mem_init(void)
if (is_secure_guest())
svm_swiotlb_init();
else
swiotlb_init(0);
swiotlb_init(ppc_swiotlb_enable, 0);
#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)

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();
}

15
arch/x86/kernel/pci-dma.c
View file

@ -39,6 +39,7 @@ int iommu_detected __read_mostly = 0;
#ifdef CONFIG_SWIOTLB
bool x86_swiotlb_enable;
static unsigned int x86_swiotlb_flags;
static void __init pci_swiotlb_detect(void)
{
@ -58,16 +59,16 @@ static void __init pci_swiotlb_detect(void)
* 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))
swiotlb_force = SWIOTLB_FORCE;
if (swiotlb_force == SWIOTLB_FORCE)
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
@ -75,8 +76,7 @@ static bool xen_swiotlb;
static void __init pci_xen_swiotlb_init(void)
{
if (!xen_initial_domain() && !x86_swiotlb_enable &&
swiotlb_force != SWIOTLB_FORCE)
if (!xen_initial_domain() && !x86_swiotlb_enable)
return;
x86_swiotlb_enable = true;
xen_swiotlb = true;
@ -120,8 +120,7 @@ void __init pci_iommu_alloc(void)
gart_iommu_hole_init();
amd_iommu_detect();
detect_intel_iommu();
if (x86_swiotlb_enable)
swiotlb_init(0);
swiotlb_init(x86_swiotlb_enable, x86_swiotlb_flags);
}
/*

4
drivers/xen/swiotlb-xen.c
View file

@ -251,7 +251,7 @@ void __init xen_swiotlb_init_early(void)
panic("%s (rc:%d)", xen_swiotlb_error(XEN_SWIOTLB_EFIXUP), rc);
}
if (swiotlb_init_with_tbl(start, nslabs, true))
if (swiotlb_init_with_tbl(start, nslabs, SWIOTLB_VERBOSE))
panic("Cannot allocate SWIOTLB buffer");
}
#endif /* CONFIG_X86 */
@ -376,7 +376,7 @@ 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)

15
include/linux/swiotlb.h
View file

@ -13,11 +13,8 @@ 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 */
/*
* Maximum allowable number of contiguous slabs to map,
@ -36,8 +33,7 @@ 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);
int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, unsigned int flags);
unsigned long swiotlb_size_or_default(void);
extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
int swiotlb_init_late(size_t size);
@ -126,13 +122,16 @@ 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;

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 */

35
kernel/dma/swiotlb.c
View file

@ -62,7 +62,8 @@
#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;
@ -81,9 +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;
}
@ -202,7 +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);
@ -224,12 +225,13 @@ 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)
int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs,
unsigned int flags)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
size_t alloc_size;
if (swiotlb_force == SWIOTLB_NO_FORCE)
if (swiotlb_force_disable)
return 0;
/* protect against double initialization */
@ -243,8 +245,9 @@ 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();
return 0;
}
@ -253,20 +256,21 @@ 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(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)
if (!addressing_limit && !swiotlb_force_bounce)
return;
if (swiotlb_force_disable)
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))
if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
goto fail_free_mem;
return;
@ -289,7 +293,7 @@ int swiotlb_init_late(size_t size)
unsigned int order;
int rc = 0;
if (swiotlb_force == SWIOTLB_NO_FORCE)
if (swiotlb_force_disable)
return 0;
/*
@ -328,7 +332,7 @@ 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)
if (swiotlb_force_disable)
return 0;
/* protect against double initialization */
@ -353,7 +357,7 @@ void __init swiotlb_exit(void)
unsigned long tbl_vaddr;
size_t tbl_size, slots_size;
if (swiotlb_force == SWIOTLB_FORCE)
if (swiotlb_force_bounce)
return;
if (!mem->nslabs)
@ -704,8 +708,7 @@ 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);