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authorDan Williams <dan.j.williams@intel.com>2012-03-23 13:36:42 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-13 09:13:56 -0700
commit44bf24730750a6270352352ad81b1e4c92ebd151 (patch)
tree8dbaabf6f566885be8a1eb05c6747d69595b4d3d
parent6e8a4b90444918039d29d411087a76a6ef6d0893 (diff)
ioat: fix size of 'completion' for Xen
commit 275029353953c2117941ade84f02a2303912fad1 upstream. Starting with v3.2 Jonathan reports that Xen crashes loading the ioatdma driver. A debug run shows: ioatdma 0000:00:16.4: desc[0]: (0x300cc7000->0x300cc7040) cookie: 0 flags: 0x2 ctl: 0x29 (op: 0 int_en: 1 compl: 1) ... ioatdma 0000:00:16.4: ioat_get_current_completion: phys_complete: 0xcc7000 ...which shows that in this environment GFP_KERNEL memory may be backed by a 64-bit dma address. This breaks the driver's assumption that an unsigned long should be able to contain the physical address for descriptor memory. Switch to dma_addr_t which beyond being the right size, is the true type for the data i.e. an io-virtual address inidicating the engine's last processed descriptor. Reported-by: Jonathan Nieder <jrnieder@gmail.com> Reported-by: William Dauchy <wdauchy@gmail.com> Tested-by: William Dauchy <wdauchy@gmail.com> Tested-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/dma/ioat/dma.c16
-rw-r--r--drivers/dma/ioat/dma.h6
-rw-r--r--drivers/dma/ioat/dma_v2.c8
-rw-r--r--drivers/dma/ioat/dma_v3.c8
4 files changed, 19 insertions, 19 deletions
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index a4d6cb0c0343..659518015972 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -548,9 +548,9 @@ void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags,
PCI_DMA_TODEVICE, flags, 0);
}
-unsigned long ioat_get_current_completion(struct ioat_chan_common *chan)
+dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan)
{
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
u64 completion;
completion = *chan->completion;
@@ -571,7 +571,7 @@ unsigned long ioat_get_current_completion(struct ioat_chan_common *chan)
}
bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
- unsigned long *phys_complete)
+ dma_addr_t *phys_complete)
{
*phys_complete = ioat_get_current_completion(chan);
if (*phys_complete == chan->last_completion)
@@ -582,14 +582,14 @@ bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
return true;
}
-static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete)
+static void __cleanup(struct ioat_dma_chan *ioat, dma_addr_t phys_complete)
{
struct ioat_chan_common *chan = &ioat->base;
struct list_head *_desc, *n;
struct dma_async_tx_descriptor *tx;
- dev_dbg(to_dev(chan), "%s: phys_complete: %lx\n",
- __func__, phys_complete);
+ dev_dbg(to_dev(chan), "%s: phys_complete: %llx\n",
+ __func__, (unsigned long long) phys_complete);
list_for_each_safe(_desc, n, &ioat->used_desc) {
struct ioat_desc_sw *desc;
@@ -655,7 +655,7 @@ static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete)
static void ioat1_cleanup(struct ioat_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
prefetch(chan->completion);
@@ -701,7 +701,7 @@ static void ioat1_timer_event(unsigned long data)
mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
spin_unlock_bh(&ioat->desc_lock);
} else if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) {
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
spin_lock_bh(&ioat->desc_lock);
/* if we haven't made progress and we have already
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 5216c8a92a21..8bebddd189c7 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -88,7 +88,7 @@ struct ioatdma_device {
struct ioat_chan_common {
struct dma_chan common;
void __iomem *reg_base;
- unsigned long last_completion;
+ dma_addr_t last_completion;
spinlock_t cleanup_lock;
dma_cookie_t completed_cookie;
unsigned long state;
@@ -333,7 +333,7 @@ int __devinit ioat_dma_self_test(struct ioatdma_device *device);
void __devexit ioat_dma_remove(struct ioatdma_device *device);
struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev,
void __iomem *iobase);
-unsigned long ioat_get_current_completion(struct ioat_chan_common *chan);
+dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan);
void ioat_init_channel(struct ioatdma_device *device,
struct ioat_chan_common *chan, int idx);
enum dma_status ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
@@ -341,7 +341,7 @@ enum dma_status ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags,
size_t len, struct ioat_dma_descriptor *hw);
bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
- unsigned long *phys_complete);
+ dma_addr_t *phys_complete);
void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type);
void ioat_kobject_del(struct ioatdma_device *device);
extern const struct sysfs_ops ioat_sysfs_ops;
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
index 5d65f8377971..cb8864d45601 100644
--- a/drivers/dma/ioat/dma_v2.c
+++ b/drivers/dma/ioat/dma_v2.c
@@ -126,7 +126,7 @@ static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat)
spin_unlock_bh(&ioat->prep_lock);
}
-static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
+static void __cleanup(struct ioat2_dma_chan *ioat, dma_addr_t phys_complete)
{
struct ioat_chan_common *chan = &ioat->base;
struct dma_async_tx_descriptor *tx;
@@ -178,7 +178,7 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
static void ioat2_cleanup(struct ioat2_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
spin_lock_bh(&chan->cleanup_lock);
if (ioat_cleanup_preamble(chan, &phys_complete))
@@ -259,7 +259,7 @@ int ioat2_reset_sync(struct ioat_chan_common *chan, unsigned long tmo)
static void ioat2_restart_channel(struct ioat2_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
ioat2_quiesce(chan, 0);
if (ioat_cleanup_preamble(chan, &phys_complete))
@@ -274,7 +274,7 @@ void ioat2_timer_event(unsigned long data)
struct ioat_chan_common *chan = &ioat->base;
if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) {
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
u64 status;
status = ioat_chansts(chan);
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index f519c93a61e7..2dbf32b02735 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -256,7 +256,7 @@ static bool desc_has_ext(struct ioat_ring_ent *desc)
* The difference from the dma_v2.c __cleanup() is that this routine
* handles extended descriptors and dma-unmapping raid operations.
*/
-static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
+static void __cleanup(struct ioat2_dma_chan *ioat, dma_addr_t phys_complete)
{
struct ioat_chan_common *chan = &ioat->base;
struct ioat_ring_ent *desc;
@@ -314,7 +314,7 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
static void ioat3_cleanup(struct ioat2_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
spin_lock_bh(&chan->cleanup_lock);
if (ioat_cleanup_preamble(chan, &phys_complete))
@@ -333,7 +333,7 @@ static void ioat3_cleanup_event(unsigned long data)
static void ioat3_restart_channel(struct ioat2_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
ioat2_quiesce(chan, 0);
if (ioat_cleanup_preamble(chan, &phys_complete))
@@ -348,7 +348,7 @@ static void ioat3_timer_event(unsigned long data)
struct ioat_chan_common *chan = &ioat->base;
if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) {
- unsigned long phys_complete;
+ dma_addr_t phys_complete;
u64 status;
status = ioat_chansts(chan);