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iommu/vt-d: Generalise DMAR MSI setup to allow for page request events 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2015-10-07 15:37:03 +01:00
parent 907fea3491
commit 1208225cf4
2 changed files with 40 additions and 12 deletions
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42
drivers/iommu/dmar.c
View File

@ -1086,6 +1086,11 @@ static void free_iommu(struct intel_iommu *iommu)
iommu_device_destroy(iommu->iommu_dev);
if (iommu->irq) {
if (iommu->pr_irq) {
free_irq(iommu->pr_irq, iommu);
dmar_free_hwirq(iommu->pr_irq);
iommu->pr_irq = 0;
}
free_irq(iommu->irq, iommu);
dmar_free_hwirq(iommu->irq);
iommu->irq = 0;
@ -1493,53 +1498,68 @@ static const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type)
}
}
static inline int dmar_msi_reg(struct intel_iommu *iommu, int irq)
{
if (iommu->irq == irq)
return DMAR_FECTL_REG;
else if (iommu->pr_irq == irq)
return DMAR_PECTL_REG;
else
BUG();
}
void dmar_msi_unmask(struct irq_data *data)
{
struct intel_iommu *iommu = irq_data_get_irq_handler_data(data);
int reg = dmar_msi_reg(iommu, data->irq);
unsigned long flag;
/* unmask it */
raw_spin_lock_irqsave(&iommu->register_lock, flag);
writel(0, iommu->reg + DMAR_FECTL_REG);
writel(0, iommu->reg + reg);
/* Read a reg to force flush the post write */
readl(iommu->reg + DMAR_FECTL_REG);
readl(iommu->reg + reg);
raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
}
void dmar_msi_mask(struct irq_data *data)
{
unsigned long flag;
struct intel_iommu *iommu = irq_data_get_irq_handler_data(data);
int reg = dmar_msi_reg(iommu, data->irq);
unsigned long flag;
/* mask it */
raw_spin_lock_irqsave(&iommu->register_lock, flag);
writel(DMA_FECTL_IM, iommu->reg + DMAR_FECTL_REG);
writel(DMA_FECTL_IM, iommu->reg + reg);
/* Read a reg to force flush the post write */
readl(iommu->reg + DMAR_FECTL_REG);
readl(iommu->reg + reg);
raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
}
void dmar_msi_write(int irq, struct msi_msg *msg)
{
struct intel_iommu *iommu = irq_get_handler_data(irq);
int reg = dmar_msi_reg(iommu, irq);
unsigned long flag;
raw_spin_lock_irqsave(&iommu->register_lock, flag);
writel(msg->data, iommu->reg + DMAR_FEDATA_REG);
writel(msg->address_lo, iommu->reg + DMAR_FEADDR_REG);
writel(msg->address_hi, iommu->reg + DMAR_FEUADDR_REG);
writel(msg->data, iommu->reg + reg + 4);
writel(msg->address_lo, iommu->reg + reg + 8);
writel(msg->address_hi, iommu->reg + reg + 12);
raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
}
void dmar_msi_read(int irq, struct msi_msg *msg)
{
struct intel_iommu *iommu = irq_get_handler_data(irq);
int reg = dmar_msi_reg(iommu, irq);
unsigned long flag;
raw_spin_lock_irqsave(&iommu->register_lock, flag);
msg->data = readl(iommu->reg + DMAR_FEDATA_REG);
msg->address_lo = readl(iommu->reg + DMAR_FEADDR_REG);
msg->address_hi = readl(iommu->reg + DMAR_FEUADDR_REG);
msg->data = readl(iommu->reg + reg + 4);
msg->address_lo = readl(iommu->reg + reg + 8);
msg->address_hi = readl(iommu->reg + reg + 12);
raw_spin_unlock_irqrestore(&iommu->register_lock, flag);
}

10
include/linux/intel-iommu.h
View File

@ -60,6 +60,14 @@
#define DMAR_IQA_REG 0x90 /* Invalidation queue addr register */
#define DMAR_ICS_REG 0x9c /* Invalidation complete status register */
#define DMAR_IRTA_REG 0xb8 /* Interrupt remapping table addr register */
#define DMAR_PQH_REG 0xc0 /* Page request queue head register */
#define DMAR_PQT_REG 0xc8 /* Page request queue tail register */
#define DMAR_PQA_REG 0xd0 /* Page request queue address register */
#define DMAR_PRS_REG 0xdc /* Page request status register */
#define DMAR_PECTL_REG 0xe0 /* Page request event control register */
#define DMAR_PEDATA_REG 0xe4 /* Page request event interrupt data register */
#define DMAR_PEADDR_REG 0xe8 /* Page request event interrupt addr register */
#define DMAR_PEUADDR_REG 0xec /* Page request event Upper address register */
#define OFFSET_STRIDE (9)
@ -373,7 +381,7 @@ struct intel_iommu {
int seq_id; /* sequence id of the iommu */
int agaw; /* agaw of this iommu */
int msagaw; /* max sagaw of this iommu */
unsigned int irq;
unsigned int irq, pr_irq;
u16 segment; /* PCI segment# */
unsigned char name[13]; /* Device Name */