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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] Vt-d: queued invalidation cleanup
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1253003099 -3600
# Node ID 5eb18970469000dc6636c4839dd071b56cfd9abd
# Parent 98e80c3adeb64a3c18a044869dbab2ae512b4621
Vt-d: queued invalidation cleanup
This patch cleans up queued invalidation, including round wrap
check, multiple polling status and other minor changes. This version
uses local variable as the polling address, which is clean.
Signed-off-by: Zhai Edwin <edwin.zhai@xxxxxxxxx>
---
xen/drivers/passthrough/vtd/iommu.c | 1
xen/drivers/passthrough/vtd/iommu.h | 24 +++++++-----
xen/drivers/passthrough/vtd/qinval.c | 67 +++++++++++++++++++++--------------
3 files changed, 55 insertions(+), 37 deletions(-)
diff -r 98e80c3adeb6 -r 5eb189704690 xen/drivers/passthrough/vtd/iommu.c
--- a/xen/drivers/passthrough/vtd/iommu.c Tue Sep 15 09:23:44 2009 +0100
+++ b/xen/drivers/passthrough/vtd/iommu.c Tue Sep 15 09:24:59 2009 +0100
@@ -90,7 +90,6 @@ static struct intel_iommu *alloc_intel_i
memset(intel, 0, sizeof(struct intel_iommu));
spin_lock_init(&intel->qi_ctrl.qinval_lock);
- spin_lock_init(&intel->qi_ctrl.qinval_poll_lock);
spin_lock_init(&intel->ir_ctrl.iremap_lock);
return intel;
diff -r 98e80c3adeb6 -r 5eb189704690 xen/drivers/passthrough/vtd/iommu.h
--- a/xen/drivers/passthrough/vtd/iommu.h Tue Sep 15 09:23:44 2009 +0100
+++ b/xen/drivers/passthrough/vtd/iommu.h Tue Sep 15 09:24:59 2009 +0100
@@ -392,14 +392,20 @@ struct qinval_entry {
}q;
};
-struct poll_info {
- u64 saddr;
- u32 udata;
-};
-
-#define NUM_QINVAL_PAGES 1
-#define IQA_REG_QS 0 // derived from NUM_QINVAL_PAGES per VT-d spec.
-#define QINVAL_ENTRY_NR (PAGE_SIZE_4K*NUM_QINVAL_PAGES/sizeof(struct
qinval_entry))
+/* Order of queue invalidation pages */
+#define IQA_REG_QS 0
+#define NUM_QINVAL_PAGES (1 << IQA_REG_QS)
+
+/* Each entry is 16 byte */
+#define QINVAL_ENTRY_NR (1 << (IQA_REG_QS + 8))
+
+/* Status data flag */
+#define QINVAL_STAT_INIT 0
+#define QINVAL_STAT_DONE 1
+
+/* Queue invalidation head/tail shift */
+#define QINVAL_INDEX_SHIFT 4
+
#define qinval_present(v) ((v).lo & 1)
#define qinval_fault_disable(v) (((v).lo >> 1) & 1)
@@ -441,8 +447,6 @@ struct qi_ctrl {
u64 qinval_maddr; /* queue invalidation page machine address */
int qinval_index; /* queue invalidation index */
spinlock_t qinval_lock; /* lock for queue invalidation page */
- spinlock_t qinval_poll_lock; /* lock for queue invalidation poll addr */
- volatile u32 qinval_poll_status; /* used by poll methord to sync */
};
struct ir_ctrl {
diff -r 98e80c3adeb6 -r 5eb189704690 xen/drivers/passthrough/vtd/qinval.c
--- a/xen/drivers/passthrough/vtd/qinval.c Tue Sep 15 09:23:44 2009 +0100
+++ b/xen/drivers/passthrough/vtd/qinval.c Tue Sep 15 09:24:59 2009 +0100
@@ -45,18 +45,29 @@ static void print_qi_regs(struct iommu *
static int qinval_next_index(struct iommu *iommu)
{
+ u64 tail, head;
+
+ tail = dmar_readq(iommu->reg, DMAR_IQT_REG);
+ tail >>= QINVAL_INDEX_SHIFT;
+
+ head = dmar_readq(iommu->reg, DMAR_IQH_REG);
+ head >>= QINVAL_INDEX_SHIFT;
+
+ /* round wrap check */
+ if ( ( tail + 1 ) % QINVAL_ENTRY_NR == head )
+ return -1;
+
+ return tail;
+}
+
+static int qinval_update_qtail(struct iommu *iommu, int index)
+{
u64 val;
- val = dmar_readq(iommu->reg, DMAR_IQT_REG);
- return (val >> 4);
-}
-
-static int qinval_update_qtail(struct iommu *iommu, int index)
-{
- u64 val;
-
- /* Need an ASSERT to insure that we have got register lock */
- val = (index < (QINVAL_ENTRY_NR-1)) ? (index + 1) : 0;
- dmar_writeq(iommu->reg, DMAR_IQT_REG, (val << 4));
+
+ /* Need hold register lock when update tail */
+ ASSERT( spin_is_locked(&iommu->register_lock) );
+ val = (index + 1) % QINVAL_ENTRY_NR;
+ dmar_writeq(iommu->reg, DMAR_IQT_REG, (val << QINVAL_INDEX_SHIFT));
return 0;
}
@@ -146,6 +157,8 @@ int queue_invalidate_iotlb(struct iommu
spin_lock_irqsave(&iommu->register_lock, flags);
index = qinval_next_index(iommu);
+ if ( index == -1 )
+ return -EBUSY;
ret = gen_iotlb_inv_dsc(iommu, index, granu, dr, dw, did,
am, ih, addr);
ret |= qinval_update_qtail(iommu, index);
@@ -180,29 +193,29 @@ static int gen_wait_dsc(struct iommu *io
}
static int queue_invalidate_wait(struct iommu *iommu,
- u8 iflag, u8 sw, u8 fn, u32 sdata, volatile u32 *saddr)
-{
- unsigned long flags;
+ u8 iflag, u8 sw, u8 fn)
+{
s_time_t start_time;
+ u32 poll_slot = QINVAL_STAT_INIT;
int index = -1;
int ret = -1;
- struct qi_ctrl *qi_ctrl = iommu_qi_ctrl(iommu);
-
- spin_lock_irqsave(&qi_ctrl->qinval_poll_lock, flags);
- spin_lock(&iommu->register_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&iommu->register_lock, flags);
index = qinval_next_index(iommu);
- if ( *saddr == 1 )
- *saddr = 0;
- ret = gen_wait_dsc(iommu, index, iflag, sw, fn, sdata, saddr);
+ if ( index == -1 )
+ return -EBUSY;
+
+ ret = gen_wait_dsc(iommu, index, iflag, sw, fn, QINVAL_STAT_DONE,
&poll_slot);
ret |= qinval_update_qtail(iommu, index);
- spin_unlock(&iommu->register_lock);
+ spin_unlock_irqrestore(&iommu->register_lock, flags);
/* Now we don't support interrupt method */
if ( sw )
{
/* In case all wait descriptor writes to same addr with same data */
start_time = NOW();
- while ( *saddr != 1 )
+ while ( poll_slot != QINVAL_STAT_DONE )
{
if ( NOW() > (start_time + DMAR_OPERATION_TIMEOUT) )
{
@@ -212,7 +225,6 @@ static int queue_invalidate_wait(struct
cpu_relax();
}
}
- spin_unlock_irqrestore(&qi_ctrl->qinval_poll_lock, flags);
return ret;
}
@@ -223,8 +235,7 @@ int invalidate_sync(struct iommu *iommu)
if ( qi_ctrl->qinval_maddr != 0 )
{
- ret = queue_invalidate_wait(iommu,
- 0, 1, 1, 1, &qi_ctrl->qinval_poll_status);
+ ret = queue_invalidate_wait(iommu, 0, 1, 1);
return ret;
}
return 0;
@@ -269,6 +280,8 @@ int qinval_device_iotlb(struct iommu *io
spin_lock_irqsave(&iommu->register_lock, flags);
index = qinval_next_index(iommu);
+ if ( index == -1 )
+ return -EBUSY;
ret = gen_dev_iotlb_inv_dsc(iommu, index, max_invs_pend,
sid, size, addr);
ret |= qinval_update_qtail(iommu, index);
@@ -311,6 +324,8 @@ int queue_invalidate_iec(struct iommu *i
spin_lock_irqsave(&iommu->register_lock, flags);
index = qinval_next_index(iommu);
+ if ( index == -1 )
+ return -EBUSY;
ret = gen_iec_inv_dsc(iommu, index, granu, im, iidx);
ret |= qinval_update_qtail(iommu, index);
spin_unlock_irqrestore(&iommu->register_lock, flags);
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