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From: Christoph Hellwig <hch@lst.de>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org
Subject: [PATCH 1/7] swiotlb: pass bytes instead of nslabs to swiotlb_init_with_tbl
Date: Thu, 22 Apr 2021 09:19:15 +0200	[thread overview]
Message-ID: <20210422071921.1428607-2-hch@lst.de> (raw)
In-Reply-To: <20210422071921.1428607-1-hch@lst.de>

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



  reply	other threads:[~2021-04-22  7:20 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22  7:19 cleanup and fix swiotlb sizing Christoph Hellwig
2021-04-22  7:19 ` Christoph Hellwig [this message]
2021-04-22  7:19 ` [PATCH 2/7] swiotlb: use swiotlb_size_or_default in swiotlb_init Christoph Hellwig
2021-04-22  7:19 ` [PATCH 3/7] swiotlb: use swiotlb_adjust_size in setup_io_tlb_npages Christoph Hellwig
2021-04-22  7:19 ` [PATCH 4/7] powerpc/pseries: simplify svm_swiotlb_init Christoph Hellwig
2021-04-22  7:19 ` [PATCH 5/7] MIPS/octeon: simplify swiotlb initialization Christoph Hellwig
2021-04-22  7:19 ` [PATCH 6/7] swiotlb: replace default_nslabs with a byte value Christoph Hellwig
2021-04-22  7:19 ` [PATCH 7/7] swiotlb: don't override the command line in swiotlb_adjust_size Christoph Hellwig
2021-04-23  5:23   ` Tom Lendacky

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