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>

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);