#include <linux/scatterlist.h>
#include <linux/mem_encrypt.h>
#include <linux/set_memory.h>
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#endif
#include <asm/io.h>
#include <asm/dma.h>
*/
static unsigned long io_tlb_nslabs;
+/*
+ * The number of used IO TLB block
+ */
+static unsigned long io_tlb_used;
+
/*
* This is a free list describing the number of free entries available from
* each index
}
/*
- * Bounce: copy the swiotlb buffer back to the original dma location
+ * Bounce: copy the swiotlb buffer from or back to the original dma location
*/
static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
size_t size, enum dma_data_direction dir)
* request and allocate a buffer from that IO TLB pool.
*/
spin_lock_irqsave(&io_tlb_lock, flags);
+
+ if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
+ goto not_found;
+
index = ALIGN(io_tlb_index, stride);
if (index >= io_tlb_nslabs)
index = 0;
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
return DMA_MAPPING_ERROR;
found:
+ io_tlb_used += nslots;
spin_unlock_irqrestore(&io_tlb_lock, flags);
/*
*/
for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
io_tlb_list[i] = ++count;
+
+ io_tlb_used -= nslots;
}
spin_unlock_irqrestore(&io_tlb_lock, flags);
}
return true;
}
-/*
- * Return whether the given device DMA address mask can be supported
- * properly. For example, if your device can only drive the low 24-bits
- * during bus mastering, then you would pass 0x00ffffff as the mask to
- * this function.
- */
-int
-swiotlb_dma_supported(struct device *hwdev, u64 mask)
-{
- return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
-}
-
size_t swiotlb_max_mapping_size(struct device *dev)
{
return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
*/
return io_tlb_end != 0;
}
+
+#ifdef CONFIG_DEBUG_FS
+
+static int __init swiotlb_create_debugfs(void)
+{
+ struct dentry *d_swiotlb_usage;
+ struct dentry *ent;
+
+ d_swiotlb_usage = debugfs_create_dir("swiotlb", NULL);
+
+ if (!d_swiotlb_usage)
+ return -ENOMEM;
+
+ ent = debugfs_create_ulong("io_tlb_nslabs", 0400,
+ d_swiotlb_usage, &io_tlb_nslabs);
+ if (!ent)
+ goto fail;
+
+ ent = debugfs_create_ulong("io_tlb_used", 0400,
+ d_swiotlb_usage, &io_tlb_used);
+ if (!ent)
+ goto fail;
+
+ return 0;
+
+fail:
+ debugfs_remove_recursive(d_swiotlb_usage);
+ return -ENOMEM;
+}
+
+late_initcall(swiotlb_create_debugfs);
+
+#endif