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Subject[tip:x86/dma] dma/swiotlb: Remove swiotlb_set_mem_attributes()
Commit-ID:  e7de6c7cc207be78369d45fb833d7d53aeda47f8
Gitweb: https://git.kernel.org/tip/e7de6c7cc207be78369d45fb833d7d53aeda47f8
Author: Christoph Hellwig <hch@lst.de>
AuthorDate: Mon, 19 Mar 2018 11:38:23 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 20 Mar 2018 10:01:58 +0100

dma/swiotlb: Remove swiotlb_set_mem_attributes()

Now that set_memory_decrypted() is always available we can just call it
directly.

Tested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Jon Mason <jdmason@kudzu.us>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Muli Ben-Yehuda <mulix@mulix.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: iommu@lists.linux-foundation.org
Link: http://lkml.kernel.org/r/20180319103826.12853-12-hch@lst.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/mem_encrypt.h | 2 --
arch/x86/mm/mem_encrypt.c | 8 --------
lib/swiotlb.c | 12 ++++++------
3 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 8fe61ad21047..c0643831706e 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -49,8 +49,6 @@ int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
/* Architecture __weak replacement functions */
void __init mem_encrypt_init(void);

-void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
-
bool sme_active(void);
bool sev_active(void);

diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 1217a4fab915..d243e8d80d89 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -441,11 +441,3 @@ void __init mem_encrypt_init(void)
: "Secure Memory Encryption (SME)");
}

-void swiotlb_set_mem_attributes(void *vaddr, unsigned long size)
-{
- WARN(PAGE_ALIGN(size) != size,
- "size is not page-aligned (%#lx)\n", size);
-
- /* Make the SWIOTLB buffer area decrypted */
- set_memory_decrypted((unsigned long)vaddr, size >> PAGE_SHIFT);
-}
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index c43ec2271469..005d1d87bb2e 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -31,6 +31,7 @@
#include <linux/gfp.h>
#include <linux/scatterlist.h>
#include <linux/mem_encrypt.h>
+#include <linux/set_memory.h>

#include <asm/io.h>
#include <asm/dma.h>
@@ -156,8 +157,6 @@ unsigned long swiotlb_size_or_default(void)
return size ? size : (IO_TLB_DEFAULT_SIZE);
}

-void __weak swiotlb_set_mem_attributes(void *vaddr, unsigned long size) { }
-
/* For swiotlb, clear memory encryption mask from dma addresses */
static dma_addr_t swiotlb_phys_to_dma(struct device *hwdev,
phys_addr_t address)
@@ -209,12 +208,12 @@ void __init swiotlb_update_mem_attributes(void)

vaddr = phys_to_virt(io_tlb_start);
bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
- swiotlb_set_mem_attributes(vaddr, bytes);
+ set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
memset(vaddr, 0, bytes);

vaddr = phys_to_virt(io_tlb_overflow_buffer);
bytes = PAGE_ALIGN(io_tlb_overflow);
- swiotlb_set_mem_attributes(vaddr, bytes);
+ set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
memset(vaddr, 0, bytes);
}

@@ -355,7 +354,7 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
io_tlb_start = virt_to_phys(tlb);
io_tlb_end = io_tlb_start + bytes;

- swiotlb_set_mem_attributes(tlb, bytes);
+ set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
memset(tlb, 0, bytes);

/*
@@ -366,7 +365,8 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
if (!v_overflow_buffer)
goto cleanup2;

- swiotlb_set_mem_attributes(v_overflow_buffer, io_tlb_overflow);
+ set_memory_decrypted((unsigned long)v_overflow_buffer,
+ io_tlb_overflow >> PAGE_SHIFT);
memset(v_overflow_buffer, 0, io_tlb_overflow);
io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);

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