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Diffstat (limited to 'kernel/dma/swiotlb.c')
-rw-r--r--kernel/dma/swiotlb.c45
1 files changed, 1 insertions, 44 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index dac42a2ad588..0fb16bdbbcae 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -73,8 +73,6 @@ static bool swiotlb_force_disable;
struct io_tlb_mem io_tlb_default_mem;
-phys_addr_t swiotlb_unencrypted_base;
-
static unsigned long default_nslabs = IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT;
static unsigned long default_nareas;
@@ -202,34 +200,6 @@ static inline unsigned long nr_slots(u64 val)
}
/*
- * Remap swioltb memory in the unencrypted physical address space
- * when swiotlb_unencrypted_base is set. (e.g. for Hyper-V AMD SEV-SNP
- * Isolation VMs).
- */
-#ifdef CONFIG_HAS_IOMEM
-static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
-{
- void *vaddr = NULL;
-
- if (swiotlb_unencrypted_base) {
- phys_addr_t paddr = mem->start + swiotlb_unencrypted_base;
-
- vaddr = memremap(paddr, bytes, MEMREMAP_WB);
- if (!vaddr)
- pr_err("Failed to map the unencrypted memory %pa size %lx.\n",
- &paddr, bytes);
- }
-
- return vaddr;
-}
-#else
-static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
-{
- return NULL;
-}
-#endif
-
-/*
* Early SWIOTLB allocation may be too early to allow an architecture to
* perform the desired operations. This function allows the architecture to
* call SWIOTLB when the operations are possible. It needs to be called
@@ -238,18 +208,12 @@ static void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
void __init swiotlb_update_mem_attributes(void)
{
struct io_tlb_mem *mem = &io_tlb_default_mem;
- void *vaddr;
unsigned long bytes;
if (!mem->nslabs || mem->late_alloc)
return;
- vaddr = phys_to_virt(mem->start);
bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
- set_memory_decrypted((unsigned long)vaddr, bytes >> PAGE_SHIFT);
-
- mem->vaddr = swiotlb_mem_remap(mem, bytes);
- if (!mem->vaddr)
- mem->vaddr = vaddr;
+ set_memory_decrypted((unsigned long)mem->vaddr, bytes >> PAGE_SHIFT);
}
static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
@@ -280,13 +244,6 @@ static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
mem->slots[i].alloc_size = 0;
}
- /*
- * If swiotlb_unencrypted_base is set, the bounce buffer memory will
- * be remapped and cleared in swiotlb_update_mem_attributes.
- */
- if (swiotlb_unencrypted_base)
- return;
-
memset(vaddr, 0, bytes);
mem->vaddr = vaddr;
return;