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>

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index a4d6cb0..6595180 100644 (file)
--- 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 5216c8a..8bebddd 100644 (file)
--- 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 5d65f83..cb8864d 100644 (file)
--- 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 f519c93..2dbf32b 100644 (file)
--- 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);