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Subject[PATCH v4 01/14] swiotlb: Remove external access to io_tlb_start
Date
Add a new function, get_swiotlb_start(), and remove external access to
io_tlb_start, so we can entirely hide struct swiotlb inside of swiotlb.c
in the following patches.

Signed-off-by: Claire Chang <tientzu@chromium.org>
---
arch/powerpc/platforms/pseries/svm.c | 4 ++--
drivers/xen/swiotlb-xen.c | 4 ++--
include/linux/swiotlb.h | 1 +
kernel/dma/swiotlb.c | 5 +++++
4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index 7b739cc7a8a9..c10c51d49f3d 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -55,8 +55,8 @@ void __init svm_swiotlb_init(void)
if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
return;

- if (io_tlb_start)
- memblock_free_early(io_tlb_start,
+ if (vstart)
+ memblock_free_early(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 2b385c1b4a99..91f8c68d1a9b 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -192,8 +192,8 @@ int __ref xen_swiotlb_init(int verbose, bool early)
/*
* IO TLB memory already allocated. Just use it.
*/
- if (io_tlb_start != 0) {
- xen_io_tlb_start = phys_to_virt(io_tlb_start);
+ if (is_swiotlb_active()) {
+ xen_io_tlb_start = phys_to_virt(get_swiotlb_start());
goto end;
}

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index d9c9fc9ca5d2..83200f3b042a 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -81,6 +81,7 @@ void __init swiotlb_exit(void);
unsigned int swiotlb_max_segment(void);
size_t swiotlb_max_mapping_size(struct device *dev);
bool is_swiotlb_active(void);
+phys_addr_t get_swiotlb_start(void);
void __init swiotlb_adjust_size(unsigned long new_size);
#else
#define swiotlb_force SWIOTLB_NO_FORCE
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 7c42df6e6100..e180211f6ad9 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -719,6 +719,11 @@ bool is_swiotlb_active(void)
return io_tlb_end != 0;
}

+phys_addr_t get_swiotlb_start(void)
+{
+ return io_tlb_start;
+}
+
#ifdef CONFIG_DEBUG_FS

static int __init swiotlb_create_debugfs(void)
--
This can be dropped if Christoph's swiotlb cleanups are landed.
https://lore.kernel.org/linux-iommu/20210207160934.2955931-1-hch@lst.de/T/#m7124f29b6076d462101fcff6433295157621da09

2.30.0.478.g8a0d178c01-goog

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