Commit 556ab45f authored by Dan Williams's avatar Dan Williams

ioat2: catch and recover from broken vtd configurations v6

On some platforms (MacPro3,1) the BIOS assigns the ioatdma device to the
incorrect iommu causing faults when the driver initializes.  Add a quirk
to catch this misconfiguration and try falling back to untranslated
operation (which works in the MacPro3,1 case).

Assuming there are other platforms with misconfigured iommus teach the
ioatdma driver to treat initialization failures as non-fatal (just fail
the driver load and emit a warning instead of triggering a BUG_ON).

This can be classified as a boot regression since 2.6.32 on affected
platforms since the ioatdma module did not autoload prior to that
kernel.

Cc: <stable@kernel.org>
Acked-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Reported-by: default avatarChris Li <lkml@chrisli.org>
Tested-by: default avatarChris Li <lkml@chrisli.org>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 128f904a
...@@ -97,6 +97,7 @@ struct ioat_chan_common { ...@@ -97,6 +97,7 @@ struct ioat_chan_common {
#define IOAT_RESET_PENDING 2 #define IOAT_RESET_PENDING 2
#define IOAT_KOBJ_INIT_FAIL 3 #define IOAT_KOBJ_INIT_FAIL 3
#define IOAT_RESHAPE_PENDING 4 #define IOAT_RESHAPE_PENDING 4
#define IOAT_RUN 5
struct timer_list timer; struct timer_list timer;
#define COMPLETION_TIMEOUT msecs_to_jiffies(100) #define COMPLETION_TIMEOUT msecs_to_jiffies(100)
#define IDLE_TIMEOUT msecs_to_jiffies(2000) #define IDLE_TIMEOUT msecs_to_jiffies(2000)
......
...@@ -287,7 +287,10 @@ void ioat2_timer_event(unsigned long data) ...@@ -287,7 +287,10 @@ void ioat2_timer_event(unsigned long data)
chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
dev_err(to_dev(chan), "%s: Channel halted (%x)\n", dev_err(to_dev(chan), "%s: Channel halted (%x)\n",
__func__, chanerr); __func__, chanerr);
if (test_bit(IOAT_RUN, &chan->state))
BUG_ON(is_ioat_bug(chanerr)); BUG_ON(is_ioat_bug(chanerr));
else /* we never got off the ground */
return;
} }
/* if we haven't made progress and we have already /* if we haven't made progress and we have already
...@@ -492,6 +495,8 @@ static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gf ...@@ -492,6 +495,8 @@ static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gf
return ring; return ring;
} }
void ioat2_free_chan_resources(struct dma_chan *c);
/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring /* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring
* @chan: channel to be initialized * @chan: channel to be initialized
*/ */
...@@ -500,6 +505,7 @@ int ioat2_alloc_chan_resources(struct dma_chan *c) ...@@ -500,6 +505,7 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
struct ioat2_dma_chan *ioat = to_ioat2_chan(c); struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
struct ioat_chan_common *chan = &ioat->base; struct ioat_chan_common *chan = &ioat->base;
struct ioat_ring_ent **ring; struct ioat_ring_ent **ring;
u64 status;
int order; int order;
/* have we already been set up? */ /* have we already been set up? */
...@@ -540,7 +546,20 @@ int ioat2_alloc_chan_resources(struct dma_chan *c) ...@@ -540,7 +546,20 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
tasklet_enable(&chan->cleanup_task); tasklet_enable(&chan->cleanup_task);
ioat2_start_null_desc(ioat); ioat2_start_null_desc(ioat);
/* check that we got off the ground */
udelay(5);
status = ioat_chansts(chan);
if (is_ioat_active(status) || is_ioat_idle(status)) {
set_bit(IOAT_RUN, &chan->state);
return 1 << ioat->alloc_order; return 1 << ioat->alloc_order;
} else {
u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
dev_WARN(to_dev(chan),
"failed to start channel chanerr: %#x\n", chanerr);
ioat2_free_chan_resources(c);
return -EFAULT;
}
} }
bool reshape_ring(struct ioat2_dma_chan *ioat, int order) bool reshape_ring(struct ioat2_dma_chan *ioat, int order)
...@@ -778,6 +797,7 @@ void ioat2_free_chan_resources(struct dma_chan *c) ...@@ -778,6 +797,7 @@ void ioat2_free_chan_resources(struct dma_chan *c)
del_timer_sync(&chan->timer); del_timer_sync(&chan->timer);
device->cleanup_fn((unsigned long) c); device->cleanup_fn((unsigned long) c);
device->reset_hw(chan); device->reset_hw(chan);
clear_bit(IOAT_RUN, &chan->state);
spin_lock_bh(&chan->cleanup_lock); spin_lock_bh(&chan->cleanup_lock);
spin_lock_bh(&ioat->prep_lock); spin_lock_bh(&ioat->prep_lock);
......
...@@ -361,7 +361,10 @@ static void ioat3_timer_event(unsigned long data) ...@@ -361,7 +361,10 @@ static void ioat3_timer_event(unsigned long data)
chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
dev_err(to_dev(chan), "%s: Channel halted (%x)\n", dev_err(to_dev(chan), "%s: Channel halted (%x)\n",
__func__, chanerr); __func__, chanerr);
if (test_bit(IOAT_RUN, &chan->state))
BUG_ON(is_ioat_bug(chanerr)); BUG_ON(is_ioat_bug(chanerr));
else /* we never got off the ground */
return;
} }
/* if we haven't made progress and we have already /* if we haven't made progress and we have already
......
...@@ -3029,6 +3029,34 @@ static void __init iommu_exit_mempool(void) ...@@ -3029,6 +3029,34 @@ static void __init iommu_exit_mempool(void)
} }
static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev)
{
struct dmar_drhd_unit *drhd;
u32 vtbar;
int rc;
/* We know that this device on this chipset has its own IOMMU.
* If we find it under a different IOMMU, then the BIOS is lying
* to us. Hope that the IOMMU for this device is actually
* disabled, and it needs no translation...
*/
rc = pci_bus_read_config_dword(pdev->bus, PCI_DEVFN(0, 0), 0xb0, &vtbar);
if (rc) {
/* "can't" happen */
dev_info(&pdev->dev, "failed to run vt-d quirk\n");
return;
}
vtbar &= 0xffff0000;
/* we know that the this iommu should be at offset 0xa000 from vtbar */
drhd = dmar_find_matched_drhd_unit(pdev);
if (WARN_TAINT_ONCE(!drhd || drhd->reg_base_addr - vtbar != 0xa000,
TAINT_FIRMWARE_WORKAROUND,
"BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n"))
pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO;
}
DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB, quirk_ioat_snb_local_iommu);
static void __init init_no_remapping_devices(void) static void __init init_no_remapping_devices(void)
{ {
struct dmar_drhd_unit *drhd; struct dmar_drhd_unit *drhd;
......
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