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Date: Fri, 21 Nov 2008 17:26:04 +0100
From: Joerg Roedel <joerg.roedel@....com>
To: Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>
CC: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
iommu@...ts.linux-foundation.org,
Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 04/10] x86: add helper functions for consistency checks
Impact: adds helper functions to be used later
Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
arch/x86/kernel/pci-dma-debug.c | 125 +++++++++++++++++++++++++++++++++++++++
1 files changed, 125 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/pci-dma-debug.c b/arch/x86/kernel/pci-dma-debug.c
index c2d3408..fc95631 100644
--- a/arch/x86/kernel/pci-dma-debug.c
+++ b/arch/x86/kernel/pci-dma-debug.c
@@ -42,6 +42,11 @@ static struct kmem_cache *dma_entry_cache;
/* lock to protect the data structures */
static DEFINE_SPINLOCK(dma_lock);
+static char *type2name[3] = { "single", "scather-gather", "coherent" };
+
+static char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
+ "DMA_FROM_DEVICE", "DMA_NONE" };
+
static int hash_fn(struct dma_debug_entry *entry)
{
/*
@@ -95,6 +100,126 @@ static void remove_dma_entry(struct dma_debug_entry *entry)
list_del(&entry->list);
}
+static bool check_unmap(struct dma_debug_entry *ref,
+ struct dma_debug_entry *entry)
+{
+ bool errors = false;
+
+ if (!entry) {
+ dev_printk(KERN_ERR, ref->dev, "PCI-DMA: device driver tries "
+ "to free DMA memory it has not allocated "
+ "[device address=0x%016llx] [size=%llu bytes]\n",
+ ref->dev_addr, ref->size);
+ dump_stack();
+
+ return false;
+ }
+
+ if (ref->size != entry->size) {
+ dev_printk(KERN_ERR, ref->dev, "PCI-DMA: device driver frees "
+ "DMA memory with different size "
+ "[device address=0x%016llx] [map size=%llu bytes] "
+ "[unmap size=%llu bytes]\n",
+ ref->dev_addr, entry->size, ref->size);
+ errors = true;
+ }
+
+ if (ref->type != entry->type) {
+ dev_printk(KERN_ERR, ref->dev, "PCI-DMA: device driver frees "
+ "DMA memory different that it was allocated "
+ "[device address=0x%016llx] [size=%llu bytes] "
+ "[mapped as %s] [unmapped as %s]\n",
+ ref->dev_addr, ref->size,
+ type2name[entry->type], type2name[ref->type]);
+ errors = true;
+ } else if ((entry->type == DMA_DEBUG_COHERENT) &&
+ (ref->cpu_addr != entry->cpu_addr)) {
+ dev_printk(KERN_ERR, ref->dev, "PCI-DMA: device driver frees "
+ "DMA memory with different CPU address "
+ "[device address=0x%016llx] [size=%llu bytes] "
+ "[cpu alloc address=%p] [cpu free address=%p]",
+ ref->dev_addr, ref->size,
+ entry->cpu_addr, ref->cpu_addr);
+ errors = true;
+
+ }
+
+ /*
+ * This may be no bug in reality - but most implementations of the
+ * DMA API don't handle this properly, so check for it here
+ */
+ if (ref->direction != entry->direction) {
+ dev_printk(KERN_ERR, ref->dev, "PCI-DMA: device driver frees "
+ "DMA memory with different direction "
+ "[device address=0x%016llx] [size=%llu bytes] "
+ "[mapped with %s] [unmapped with %s]\n",
+ ref->dev_addr, ref->size,
+ dir2name[entry->direction],
+ dir2name[ref->direction]);
+ errors = true;
+ }
+
+ if (errors)
+ dump_stack();
+
+ return true;
+}
+
+static void check_sync(struct device *dev, dma_addr_t addr,
+ u64 size, u64 offset, int direction, bool to_cpu)
+{
+ bool error = false;
+ unsigned long flags;
+ struct dma_debug_entry ref = {
+ .dev = dev,
+ .dev_addr = addr,
+ .size = size,
+ .direction = direction,
+ };
+ struct dma_debug_entry *entry;
+
+ spin_lock_irqsave(&dma_lock, flags);
+
+ entry = find_dma_entry(&ref);
+
+ if (!entry) {
+ dev_printk(KERN_ERR, dev, "PCI-DMA: device driver tries "
+ "to sync DMA memory it has not allocated "
+ "[device address=0x%016llx] [size=%llu bytes]\n",
+ addr, size);
+ error = true;
+ goto out;
+ }
+
+ if ((offset + size) > entry->size) {
+ dev_printk(KERN_ERR, dev, "PCI-DMA: device driver syncs"
+ " DMA memory outside allocated range "
+ "[device address=0x%016llx] "
+ "[allocation size=%llu bytes] [sync offset=%llu] "
+ "[sync size=%llu]\n", entry->dev_addr, entry->size,
+ offset, size);
+ error = true;
+ }
+
+ if (direction != entry->direction) {
+ dev_printk(KERN_ERR, dev, "PCI-DMA: device driver syncs "
+ "DMA memory with different direction "
+ "[device address=0x%016llx] [size=%llu bytes] "
+ "[mapped with %s] [synced with %s]\n",
+ addr, entry->size,
+ dir2name[entry->direction],
+ dir2name[direction]);
+ error = true;
+ }
+
+out:
+ spin_unlock_irqrestore(&dma_lock, flags);
+
+ if (error)
+ dump_stack();
+}
+
+
void dma_debug_init(void)
{
int i;
--
1.5.6.4
--
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