[PATCH 1/7] swiotlb: pass bytes instead of nslabs to swiotlb_init_with_tbl
From: Christoph Hellwig <hch@lst.de>
Date: 2021-04-22 07:22:47
Also in:
linux-iommu, linux-mips, xen-devel
Subsystem:
dma mapping helpers, linux for powerpc (32-bit and 64-bit), mips, the rest, xen hypervisor interface, xen swiotlb subsystem · Maintainers:
Marek Szyprowski, Madhavan Srinivasan, Michael Ellerman, Thomas Bogendoerfer, Linus Torvalds, Juergen Gross, Stefano Stabellini
Pass the actual allocation size to swiotlb_init_with_tbl, which simplifies things quite a bit. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/mips/cavium-octeon/dma-octeon.c | 2 +- arch/powerpc/platforms/pseries/svm.c | 3 +-- drivers/xen/swiotlb-xen.c | 2 +- include/linux/swiotlb.h | 2 +- kernel/dma/swiotlb.c | 10 +++++----- 5 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c
index df70308db0e697..020b8ce5b8ff7c 100644
--- a/arch/mips/cavium-octeon/dma-octeon.c
+++ b/arch/mips/cavium-octeon/dma-octeon.c@@ -245,6 +245,6 @@ void __init plat_swiotlb_setup(void) 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) + if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlbsize, 1) == -ENOMEM) panic("Cannot allocate SWIOTLB buffer"); }
diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index 1d829e257996fb..4d281ff56ce96f 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c@@ -52,10 +52,9 @@ void __init svm_swiotlb_init(void) 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)) + if (vstart && !swiotlb_init_with_tbl(vstart, bytes, false)) return; - memblock_free_early(__pa(vstart), PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); panic("SVM: Cannot allocate SWIOTLB buffer");
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 4c89afc0df6289..18d79f07b507ce 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c@@ -249,7 +249,7 @@ 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, false)) + if (swiotlb_init_with_tbl(start, bytes, false)) panic("Cannot allocate SWIOTLB buffer"); swiotlb_set_max_segment(PAGE_SIZE); }
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 216854a5e5134b..d1d40ca5014b54 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h@@ -36,7 +36,7 @@ enum swiotlb_force { #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, size_t bytes, 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);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 0a5b6f7e75bce6..c7b3dd86db7f56 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c@@ -166,9 +166,9 @@ void __init swiotlb_update_mem_attributes(void) memset(vaddr, 0, bytes); } -int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) +int __init swiotlb_init_with_tbl(char *tlb, size_t bytes, int verbose) { - unsigned long bytes = nslabs << IO_TLB_SHIFT, i; + unsigned long nslabs = bytes >> IO_TLB_SHIFT, i; struct io_tlb_mem *mem; size_t alloc_size;
@@ -209,17 +209,17 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) void __init swiotlb_init(int verbose) { - size_t bytes = PAGE_ALIGN(default_nslabs << IO_TLB_SHIFT); + size_t bytes = 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); + tlb = memblock_alloc_low(PAGE_ALIGN(bytes), PAGE_SIZE); if (!tlb) goto fail; - if (swiotlb_init_with_tbl(tlb, default_nslabs, verbose)) + if (swiotlb_init_with_tbl(tlb, bytes, verbose)) goto fail_free_mem; return;
--
2.30.1