Teach swiotlb to distinguish between encrypted and decrypted bounce
buffer pools, and make allocation and mapping paths select a pool whose
state matches the requested DMA attributes.
Add a cc_shared flag to io_tlb_mem, initialize it for the default and
restricted pools, and propagate __DMA_ATTR_ALLOC_CC_SHARED into swiotlb
pool allocation. Reject swiotlb alloc/map requests when the selected pool
does not match the required encrypted/decrypted state.
Also return DMA addresses with the matching phys_to_dma_{encrypted,
unencrypted} helper so the DMA address encoding stays consistent with the
chosen pool.
Tested-by: Jiri Pirko <[email protected]>
Tested-by: Michael Kelley <[email protected]>
Tested-by: Mostafa Saleh <[email protected]>
Signed-off-by: Aneesh Kumar K.V (Arm) <[email protected]>
---
include/linux/dma-direct.h | 10 +++
include/linux/swiotlb.h | 10 ++-
kernel/dma/direct.c | 13 ++-
kernel/dma/swiotlb.c | 177 ++++++++++++++++++++++++++++---------
4 files changed, 162 insertions(+), 48 deletions(-)
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index c249912456f9..94fad4e7c11e 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -77,6 +77,10 @@ static inline dma_addr_t dma_range_map_max(const struct
bus_dma_region *map)
#ifndef phys_to_dma_unencrypted
#define phys_to_dma_unencrypted phys_to_dma
#endif
+
+#ifndef phys_to_dma_encrypted
+#define phys_to_dma_encrypted phys_to_dma
+#endif
#else
static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
{
@@ -90,6 +94,12 @@ static inline dma_addr_t phys_to_dma_unencrypted(struct
device *dev,
{
return dma_addr_unencrypted(__phys_to_dma(dev, paddr));
}
+
+static inline dma_addr_t phys_to_dma_encrypted(struct device *dev,
+ phys_addr_t paddr)
+{
+ return dma_addr_encrypted(__phys_to_dma(dev, paddr));
+}
/*
* If memory encryption is supported, phys_to_dma will set the memory
encryption
* bit in the DMA address, and dma_to_phys will clear it.
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index ea4c0a292dea..ee42f7588847 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -66,6 +66,7 @@ extern void __init swiotlb_update_mem_attributes(void);
* @node: Member of the IO TLB memory pool list.
* @rcu: RCU head for swiotlb_dyn_free().
* @transient: %true if transient memory pool.
+ * @cc_shared: %true if the pool memory is shared for confidential computing.
*/
struct io_tlb_pool {
phys_addr_t start;
@@ -81,6 +82,7 @@ struct io_tlb_pool {
struct list_head node;
struct rcu_head rcu;
bool transient;
+ bool cc_shared;
#endif
};
@@ -92,6 +94,7 @@ struct io_tlb_pool {
* @debugfs: The dentry to debugfs.
* @force_bounce: %true if swiotlb bouncing is forced
* @for_alloc: %true if the pool is used for memory allocation
+ * @cc_shared: %true if the pool memory is shared for confidential computing.
* @can_grow: %true if more pools can be allocated dynamically.
* @phys_limit: Maximum allowed physical address.
* @lock: Lock to synchronize changes to the list.
@@ -111,6 +114,7 @@ struct io_tlb_mem {
struct dentry *debugfs;
bool force_bounce;
bool for_alloc;
+ bool cc_shared;
#ifdef CONFIG_SWIOTLB_DYNAMIC
bool can_grow;
u64 phys_limit;
@@ -282,7 +286,8 @@ static inline void swiotlb_sync_single_for_cpu(struct
device *dev,
extern void swiotlb_print_info(void);
#ifdef CONFIG_DMA_RESTRICTED_POOL
-struct page *swiotlb_alloc(struct device *dev, size_t size);
+struct page *swiotlb_alloc(struct device *dev, size_t size,
+ unsigned long attrs);
bool swiotlb_free(struct device *dev, struct page *page, size_t size);
void swiotlb_free_from_pool(struct device *dev,
phys_addr_t tlb_addr, struct io_tlb_pool *pool);
@@ -292,7 +297,8 @@ static inline bool is_swiotlb_for_alloc(struct device *dev)
return dev->dma_io_tlb_mem->for_alloc;
}
#else
-static inline struct page *swiotlb_alloc(struct device *dev, size_t size)
+static inline struct page *swiotlb_alloc(struct device *dev, size_t size,
+ unsigned long attrs)
{
return NULL;
}
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index c50d6987438e..64cb9f13ef03 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -96,9 +96,10 @@ static int dma_set_encrypted(struct device *dev, void
*vaddr, size_t size)
return ret;
}
-static struct page *dma_direct_alloc_swiotlb(struct device *dev, size_t size)
+static struct page *dma_direct_alloc_swiotlb(struct device *dev, size_t size,
+ unsigned long attrs)
{
- struct page *page = swiotlb_alloc(dev, size);
+ struct page *page = swiotlb_alloc(dev, size, attrs);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
swiotlb_free(dev, page, size);
@@ -251,8 +252,12 @@ void *dma_direct_alloc(struct device *dev, size_t size,
}
if (is_swiotlb_for_alloc(dev)) {
- page = dma_direct_alloc_swiotlb(dev, size);
+ page = dma_direct_alloc_swiotlb(dev, size, attrs);
if (page) {
+ /*
+ * swiotlb allocations comes from pool already marked
+ * decrypted
+ */
mark_mem_decrypt = false;
goto setup_page;
}
@@ -398,7 +403,7 @@ struct page *dma_direct_alloc_pages(struct device *dev,
size_t size,
&ret, gfp, attrs);
if (is_swiotlb_for_alloc(dev)) {
- page = dma_direct_alloc_swiotlb(dev, size);
+ page = dma_direct_alloc_swiotlb(dev, size, attrs);
if (!page)
return NULL;
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 046ae92c4832..335e27bc1e1f 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -259,10 +259,21 @@ void __init swiotlb_update_mem_attributes(void)
struct io_tlb_pool *mem = &io_tlb_default_mem.defpool;
unsigned long bytes;
+ /*
+ * if platform support memory encryption, swiotlb buffers are
+ * shared by default.
+ */
+ if (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
+ io_tlb_default_mem.cc_shared = true;
+ else
+ io_tlb_default_mem.cc_shared = false;
+
if (!mem->nslabs || mem->late_alloc)
return;
bytes = PAGE_ALIGN(mem->nslabs << IO_TLB_SHIFT);
- set_memory_decrypted((unsigned long)mem->vaddr, bytes >> PAGE_SHIFT);
+
+ if (io_tlb_default_mem.cc_shared)
+ set_memory_decrypted((unsigned long)mem->vaddr, bytes >>
PAGE_SHIFT);
}
static void swiotlb_init_io_tlb_pool(struct io_tlb_pool *mem, phys_addr_t
start,
@@ -505,8 +516,10 @@ int swiotlb_init_late(size_t size, gfp_t gfp_mask,
if (!mem->slots)
goto error_slots;
- set_memory_decrypted((unsigned long)vstart,
- (nslabs << IO_TLB_SHIFT) >> PAGE_SHIFT);
+ if (io_tlb_default_mem.cc_shared)
+ set_memory_decrypted((unsigned long)vstart,
+ (nslabs << IO_TLB_SHIFT) >> PAGE_SHIFT);
+
swiotlb_init_io_tlb_pool(mem, virt_to_phys(vstart), vstart, nslabs,
true,
nareas);
add_mem_pool(&io_tlb_default_mem, mem);
@@ -539,7 +552,9 @@ void __init swiotlb_exit(void)
tbl_size = PAGE_ALIGN(mem->end - mem->start);
slots_size = PAGE_ALIGN(array_size(sizeof(*mem->slots), mem->nslabs));
- set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT);
+ if (io_tlb_default_mem.cc_shared)
+ set_memory_encrypted(tbl_vaddr, tbl_size >> PAGE_SHIFT);
+
if (mem->late_alloc) {
area_order = get_order(array_size(sizeof(*mem->areas),
mem->nareas));
@@ -563,6 +578,7 @@ void __init swiotlb_exit(void)
* @gfp: GFP flags for the allocation.
* @bytes: Size of the buffer.
* @phys_limit: Maximum allowed physical address of the buffer.
+ * @attrs: DMA attributes for the allocation.
*
* Allocate pages from the buddy allocator. If successful, make the allocated
* pages decrypted that they can be used for DMA.
@@ -570,9 +586,11 @@ void __init swiotlb_exit(void)
* Return: Decrypted pages, %NULL on allocation failure, or ERR_PTR(-EAGAIN)
* if the allocated physical address was above @phys_limit.
*/
-static struct page *alloc_dma_pages(gfp_t gfp, size_t bytes, u64 phys_limit)
+static struct page *alloc_dma_pages(gfp_t gfp, size_t bytes,
+ u64 phys_limit, unsigned long attrs)
{
unsigned int order = get_order(bytes);
+ bool cc_shared = attrs & __DMA_ATTR_ALLOC_CC_SHARED;
struct page *page;
phys_addr_t paddr;
void *vaddr;
@@ -588,13 +606,13 @@ static struct page *alloc_dma_pages(gfp_t gfp, size_t
bytes, u64 phys_limit)
}
vaddr = phys_to_virt(paddr);
- if (set_memory_decrypted((unsigned long)vaddr, PFN_UP(bytes)))
+ if (cc_shared && set_memory_decrypted((unsigned long)vaddr,
PFN_UP(bytes)))
goto error;
return page;
error:
/* Intentional leak if pages cannot be encrypted again. */
- if (!set_memory_encrypted((unsigned long)vaddr, PFN_UP(bytes)))
+ if (cc_shared && !set_memory_encrypted((unsigned long)vaddr,
PFN_UP(bytes)))
__free_pages(page, order);
return NULL;
}
@@ -602,6 +620,7 @@ static struct page *alloc_dma_pages(gfp_t gfp, size_t
bytes, u64 phys_limit)
/**
* swiotlb_alloc_tlb() - allocate a dynamic IO TLB buffer
* @dev: Device for which a memory pool is allocated.
+ * @mem: SWIOTLB allocator for the pool.
* @bytes: Size of the buffer.
* @phys_limit: Maximum allowed physical address of the buffer.
* @gfp: GFP flags for the allocation.
@@ -609,25 +628,23 @@ static struct page *alloc_dma_pages(gfp_t gfp, size_t
bytes, u64 phys_limit)
*
* Return: Allocated pages, or %NULL on allocation failure.
*/
-static struct page *swiotlb_alloc_tlb(struct device *dev, size_t bytes,
+static struct page *swiotlb_alloc_tlb(struct device *dev,
+ struct io_tlb_mem *mem, size_t bytes,
u64 phys_limit, gfp_t gfp, void **vaddr)
{
struct page *page;
- unsigned long attrs = 0;
+ unsigned long attrs = mem->cc_shared ? __DMA_ATTR_ALLOC_CC_SHARED : 0;
*vaddr = NULL;
/*
* Allocate from the atomic pools if memory is encrypted and
* the allocation is atomic, because decrypting may block.
*/
- if (!gfpflags_allow_blocking(gfp) && dev && force_dma_unencrypted(dev))
{
+ if (!gfpflags_allow_blocking(gfp) && dev && mem->cc_shared) {
+
if (!IS_ENABLED(CONFIG_DMA_COHERENT_POOL))
return NULL;
- /* swiotlb considered decrypted by default */
- if (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
- attrs = __DMA_ATTR_ALLOC_CC_SHARED;
-
return dma_alloc_from_pool(dev, bytes, vaddr, gfp,
attrs, dma_coherent_ok);
}
@@ -638,7 +655,7 @@ static struct page *swiotlb_alloc_tlb(struct device *dev,
size_t bytes,
else if (phys_limit <= DMA_BIT_MASK(32))
gfp |= __GFP_DMA32;
- while (IS_ERR(page = alloc_dma_pages(gfp, bytes, phys_limit))) {
+ while (IS_ERR(page = alloc_dma_pages(gfp, bytes, phys_limit, attrs))) {
if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
phys_limit < DMA_BIT_MASK(64) &&
!(gfp & (__GFP_DMA32 | __GFP_DMA)))
@@ -659,21 +676,25 @@ static struct page *swiotlb_alloc_tlb(struct device *dev,
size_t bytes,
* swiotlb_free_tlb() - free a dynamically allocated IO TLB buffer
* @vaddr: Virtual address of the buffer.
* @bytes: Size of the buffer.
+ * @cc_shared: true if @vaddr was allocated decrypted and must be
+ * re-encrypted before being freed
*/
-static void swiotlb_free_tlb(void *vaddr, size_t bytes)
+static void swiotlb_free_tlb(void *vaddr, size_t bytes, bool cc_shared)
{
if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) &&
dma_free_from_pool(NULL, vaddr, bytes))
return;
/* Intentional leak if pages cannot be encrypted again. */
- if (!set_memory_encrypted((unsigned long)vaddr, PFN_UP(bytes)))
+ if (!cc_shared ||
+ !set_memory_encrypted((unsigned long)vaddr, PFN_UP(bytes)))
__free_pages(virt_to_page(vaddr), get_order(bytes));
}
/**
* swiotlb_alloc_pool() - allocate a new IO TLB memory pool
* @dev: Device for which a memory pool is allocated.
+ * @mem: SWIOTLB allocator for the pool.
* @minslabs: Minimum number of slabs.
* @nslabs: Desired (maximum) number of slabs.
* @nareas: Number of areas.
@@ -687,8 +708,9 @@ static void swiotlb_free_tlb(void *vaddr, size_t bytes)
* Return: New memory pool, or %NULL on allocation failure.
*/
static struct io_tlb_pool *swiotlb_alloc_pool(struct device *dev,
- unsigned long minslabs, unsigned long nslabs,
- unsigned int nareas, u64 phys_limit, gfp_t gfp)
+ struct io_tlb_mem *mem, unsigned long minslabs,
+ unsigned long nslabs, unsigned int nareas, u64 phys_limit,
+ gfp_t gfp)
{
struct io_tlb_pool *pool;
unsigned int slot_order;
@@ -707,10 +729,11 @@ static struct io_tlb_pool *swiotlb_alloc_pool(struct
device *dev,
if (!pool)
goto error;
pool->areas = (void *)pool + sizeof(*pool);
+ pool->cc_shared = mem->cc_shared;
tlb_size = nslabs << IO_TLB_SHIFT;
- while (!(tlb = swiotlb_alloc_tlb(dev, tlb_size, phys_limit, gfp,
- &tlb_vaddr))) {
+ while (!(tlb = swiotlb_alloc_tlb(dev, mem, tlb_size,
+ phys_limit, gfp, &tlb_vaddr))) {
if (nslabs <= minslabs)
goto error_tlb;
nslabs = ALIGN(nslabs >> 1, IO_TLB_SEGSIZE);
@@ -729,7 +752,7 @@ static struct io_tlb_pool *swiotlb_alloc_pool(struct device
*dev,
return pool;
error_slots:
- swiotlb_free_tlb(tlb_vaddr, tlb_size);
+ swiotlb_free_tlb(tlb_vaddr, tlb_size, mem->cc_shared);
error_tlb:
kfree(pool);
error:
@@ -746,7 +769,7 @@ static void swiotlb_dyn_alloc(struct work_struct *work)
container_of(work, struct io_tlb_mem, dyn_alloc);
struct io_tlb_pool *pool;
- pool = swiotlb_alloc_pool(NULL, IO_TLB_MIN_SLABS, default_nslabs,
+ pool = swiotlb_alloc_pool(NULL, mem, IO_TLB_MIN_SLABS, default_nslabs,
default_nareas, mem->phys_limit, GFP_KERNEL);
if (!pool) {
pr_warn_ratelimited("Failed to allocate new pool");
@@ -767,7 +790,7 @@ static void swiotlb_dyn_free(struct rcu_head *rcu)
size_t tlb_size = pool->end - pool->start;
free_pages((unsigned long)pool->slots, get_order(slots_size));
- swiotlb_free_tlb(pool->vaddr, tlb_size);
+ swiotlb_free_tlb(pool->vaddr, tlb_size, pool->cc_shared);
kfree(pool);
}
@@ -1031,6 +1054,7 @@ static void dec_transient_used(struct io_tlb_mem *mem,
unsigned int nslots)
* @pool: Memory pool to be searched.
* @area_index: Index of the IO TLB memory area to be searched.
* @orig_addr: Original (non-bounced) IO buffer address.
+ * @tbl_dma_addr: DMA address of the bounce buffer.
* @alloc_size: Total requested size of the bounce buffer,
* including initial alignment padding.
* @alloc_align_mask: Required alignment of the allocated buffer.
@@ -1042,13 +1066,11 @@ static void dec_transient_used(struct io_tlb_mem *mem,
unsigned int nslots)
* Return: Index of the first allocated slot, or -1 on error.
*/
static int swiotlb_search_pool_area(struct device *dev, struct io_tlb_pool
*pool,
- int area_index, phys_addr_t orig_addr, size_t alloc_size,
- unsigned int alloc_align_mask)
+ int area_index, phys_addr_t orig_addr, dma_addr_t tbl_dma_addr,
+ size_t alloc_size, unsigned int alloc_align_mask)
{
struct io_tlb_area *area = pool->areas + area_index;
unsigned long boundary_mask = dma_get_seg_boundary(dev);
- dma_addr_t tbl_dma_addr =
- phys_to_dma_unencrypted(dev, pool->start) & boundary_mask;
unsigned long max_slots = get_max_slots(boundary_mask);
unsigned int iotlb_align_mask = dma_get_min_align_mask(dev);
unsigned int nslots = nr_slots(alloc_size), stride;
@@ -1061,6 +1083,8 @@ static int swiotlb_search_pool_area(struct device *dev,
struct io_tlb_pool *pool
BUG_ON(!nslots);
BUG_ON(area_index >= pool->nareas);
+ tbl_dma_addr &= boundary_mask;
+
/*
* Historically, swiotlb allocations >= PAGE_SIZE were guaranteed to be
* page-aligned in the absence of any other alignment requirements.
@@ -1172,6 +1196,7 @@ static int swiotlb_search_area(struct device *dev, int
start_cpu,
{
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
struct io_tlb_pool *pool;
+ dma_addr_t tbl_dma_addr;
int area_index;
int index = -1;
@@ -1180,9 +1205,15 @@ static int swiotlb_search_area(struct device *dev, int
start_cpu,
if (cpu_offset >= pool->nareas)
continue;
area_index = (start_cpu + cpu_offset) & (pool->nareas - 1);
+
+ if (mem->cc_shared)
+ tbl_dma_addr = phys_to_dma_unencrypted(dev,
pool->start);
+ else
+ tbl_dma_addr = phys_to_dma_encrypted(dev, pool->start);
+
index = swiotlb_search_pool_area(dev, pool, area_index,
- orig_addr, alloc_size,
- alloc_align_mask);
+ orig_addr, tbl_dma_addr,
+ alloc_size, alloc_align_mask);
if (index >= 0) {
*retpool = pool;
break;
@@ -1212,6 +1243,7 @@ static int swiotlb_find_slots(struct device *dev,
phys_addr_t orig_addr,
{
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
struct io_tlb_pool *pool;
+ dma_addr_t tbl_dma_addr;
unsigned long nslabs;
unsigned long flags;
u64 phys_limit;
@@ -1236,12 +1268,17 @@ static int swiotlb_find_slots(struct device *dev,
phys_addr_t orig_addr,
nslabs = nr_slots(alloc_size);
phys_limit = min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
- pool = swiotlb_alloc_pool(dev, nslabs, nslabs, 1, phys_limit,
+ pool = swiotlb_alloc_pool(dev, mem, nslabs, nslabs, 1, phys_limit,
GFP_NOWAIT);
if (!pool)
return -1;
- index = swiotlb_search_pool_area(dev, pool, 0, orig_addr,
+ if (mem->cc_shared)
+ tbl_dma_addr = phys_to_dma_unencrypted(dev, pool->start);
+ else
+ tbl_dma_addr = phys_to_dma_encrypted(dev, pool->start);
+
+ index = swiotlb_search_pool_area(dev, pool, 0, orig_addr, tbl_dma_addr,
alloc_size, alloc_align_mask);
if (index < 0) {
swiotlb_dyn_free(&pool->rcu);
@@ -1286,15 +1323,23 @@ static int swiotlb_find_slots(struct device *dev,
phys_addr_t orig_addr,
size_t alloc_size, unsigned int alloc_align_mask,
struct io_tlb_pool **retpool)
{
+ struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
struct io_tlb_pool *pool;
+ dma_addr_t tbl_dma_addr;
int start, i;
int index;
- *retpool = pool = &dev->dma_io_tlb_mem->defpool;
+ *retpool = pool = &mem->defpool;
+ if (mem->cc_shared)
+ tbl_dma_addr = phys_to_dma_unencrypted(dev, pool->start);
+ else
+ tbl_dma_addr = phys_to_dma_encrypted(dev, pool->start);
+
i = start = raw_smp_processor_id() & (pool->nareas - 1);
do {
index = swiotlb_search_pool_area(dev, pool, i, orig_addr,
- alloc_size, alloc_align_mask);
+ tbl_dma_addr, alloc_size,
+ alloc_align_mask);
if (index >= 0)
return index;
if (++i >= pool->nareas)
@@ -1377,9 +1422,19 @@ static unsigned long mem_used(struct io_tlb_mem *mem)
* any pre- or post-padding for alignment
* @alloc_align_mask: Required start and end alignment of the allocated buffer
* @dir: DMA direction
- * @attrs: Optional DMA attributes for the map operation
+ * @attrs: Optional DMA attributes for the map operation, updated
+ * to match the selected SWIOTLB pool
*
* Find and allocate a suitable sequence of IO TLB slots for the request.
+ * The device's SWIOTLB pool must match the device's current DMA encryption
+ * requirements. If the device requires decrypted DMA, bouncing is done through
+ * an unencrypted pool and the mapping is marked shared. If the device can DMA
+ * to encrypted memory, bouncing is done through an encrypted pool even when
the
+ * original DMA address was unencrypted. Enabling encrypted DMA for a device is
+ * therefore expected to update its default io_tlb_mem to an encrypted pool, so
+ * later bounce mappings for both encrypted and decrypted original memory use
+ * that encrypted pool.
+ *
* The allocated space starts at an alignment specified by alloc_align_mask,
* and the size of the allocated space is rounded up so that the total amount
* of allocated space is a multiple of (alloc_align_mask + 1). If
@@ -1416,6 +1471,30 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev,
phys_addr_t orig_addr,
if (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
pr_warn_once("Memory encryption is active and system is using
DMA bounce buffers\n");
+ if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
+
+ /* swiotlb pool is incorrect for this device */
+ if (unlikely(mem->cc_shared != force_dma_unencrypted(dev)))
+ return (phys_addr_t)DMA_MAPPING_ERROR;
+
+ } else if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) {
+ /*
+ * On hosts with memory encryption, SWIOTLB-backed memory is
+ * unencrypted. DMA addresses returned for bounce buffers must
+ * therefore be marked unencrypted, even for devices that can
+ * address encrypted memory. This also preserves swiotlb=force
+ * behavior for those devices.
+ */
+ if (unlikely(!mem->cc_shared))
+ return (phys_addr_t)DMA_MAPPING_ERROR;
+ }
+
+ /* Force attrs to match the kind of memory in the pool */
+ if (mem->cc_shared)
+ *attrs |= DMA_ATTR_CC_SHARED;
+ else
+ *attrs &= ~DMA_ATTR_CC_SHARED;
+
/*
* The default swiotlb memory pool is allocated with PAGE_SIZE
* alignment. If a mapping is requested with larger alignment,
@@ -1613,8 +1692,11 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t
paddr, size_t size,
if (swiotlb_addr == (phys_addr_t)DMA_MAPPING_ERROR)
return DMA_MAPPING_ERROR;
- /* Ensure that the address returned is DMA'ble */
- dma_addr = phys_to_dma_unencrypted(dev, swiotlb_addr);
+ if (attrs & DMA_ATTR_CC_SHARED)
+ dma_addr = phys_to_dma_unencrypted(dev, swiotlb_addr);
+ else
+ dma_addr = phys_to_dma_encrypted(dev, swiotlb_addr);
+
if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
__swiotlb_tbl_unmap_single(dev, swiotlb_addr, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC,
@@ -1778,7 +1860,7 @@ static inline void swiotlb_create_debugfs_files(struct
io_tlb_mem *mem,
#ifdef CONFIG_DMA_RESTRICTED_POOL
-struct page *swiotlb_alloc(struct device *dev, size_t size)
+struct page *swiotlb_alloc(struct device *dev, size_t size, unsigned long
attrs)
{
struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
struct io_tlb_pool *pool;
@@ -1789,6 +1871,9 @@ struct page *swiotlb_alloc(struct device *dev, size_t
size)
if (!mem)
return NULL;
+ if (mem->cc_shared != !!(attrs & __DMA_ATTR_ALLOC_CC_SHARED))
+ return NULL;
+
align = (1 << (get_order(size) + PAGE_SHIFT)) - 1;
index = swiotlb_find_slots(dev, 0, size, align, &pool);
if (index == -1)
@@ -1864,12 +1949,20 @@ static int rmem_swiotlb_device_init(struct reserved_mem
*rmem,
kfree(mem);
return -ENOMEM;
}
+ /*
+ * if platform supports memory encryption,
+ * restricted mem pool is shared by default
+ */
+ if (cc_platform_has(CC_ATTR_MEM_ENCRYPT)) {
+ mem->cc_shared = true;
+ set_memory_decrypted((unsigned
long)phys_to_virt(rmem->base),
+ rmem->size >> PAGE_SHIFT);
+ } else {
+ mem->cc_shared = false;
+ }
- set_memory_decrypted((unsigned long)phys_to_virt(rmem->base),
- rmem->size >> PAGE_SHIFT);
swiotlb_init_io_tlb_pool(pool, rmem->base,
phys_to_virt(rmem->base),
- nslabs,
- false, nareas);
+ nslabs, false, nareas);
mem->force_bounce = true;
mem->for_alloc = true;
#ifdef CONFIG_SWIOTLB_DYNAMIC
--
2.43.0
