summaryrefslogtreecommitdiff
path: root/drivers/pci/intr_remapping.c
diff options
context:
space:
mode:
authorSuresh Siddha <suresh.b.siddha@intel.com>2008-07-10 11:16:43 -0700
committerIngo Molnar <mingo@elte.hu>2008-07-12 08:44:53 +0200
commit2ae21010694e56461a63bfc80e960090ce0a5ed9 (patch)
treed4ecdb710c4361df473b063eda9e1426fcf5c309 /drivers/pci/intr_remapping.c
parentfe962e90cb17a8426e144dee970e77ed789d98ee (diff)
x64, x2apic/intr-remap: Interrupt remapping infrastructure
Interrupt remapping (part of Intel Virtualization Tech for directed I/O) infrastructure. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: akpm@linux-foundation.org Cc: arjan@linux.intel.com Cc: andi@firstfloor.org Cc: ebiederm@xmission.com Cc: jbarnes@virtuousgeek.org Cc: steiner@sgi.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/pci/intr_remapping.c')
-rw-r--r--drivers/pci/intr_remapping.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index a80b87921c68..3d10cdc90314 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -1,10 +1,147 @@
#include <linux/dmar.h>
+#include <linux/spinlock.h>
+#include <linux/jiffies.h>
+#include <linux/pci.h>
#include <asm/io_apic.h>
#include "intel-iommu.h"
#include "intr_remapping.h"
static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
static int ir_ioapic_num;
+int intr_remapping_enabled;
+
+static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
+{
+ u64 addr;
+ u32 cmd, sts;
+ unsigned long flags;
+
+ addr = virt_to_phys((void *)iommu->ir_table->base);
+
+ spin_lock_irqsave(&iommu->register_lock, flags);
+
+ dmar_writeq(iommu->reg + DMAR_IRTA_REG,
+ (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
+
+ /* Set interrupt-remapping table pointer */
+ cmd = iommu->gcmd | DMA_GCMD_SIRTP;
+ writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+ IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+ readl, (sts & DMA_GSTS_IRTPS), sts);
+ spin_unlock_irqrestore(&iommu->register_lock, flags);
+
+ /*
+ * global invalidation of interrupt entry cache before enabling
+ * interrupt-remapping.
+ */
+ qi_global_iec(iommu);
+
+ spin_lock_irqsave(&iommu->register_lock, flags);
+
+ /* Enable interrupt-remapping */
+ cmd = iommu->gcmd | DMA_GCMD_IRE;
+ iommu->gcmd |= DMA_GCMD_IRE;
+ writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+ IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+ readl, (sts & DMA_GSTS_IRES), sts);
+
+ spin_unlock_irqrestore(&iommu->register_lock, flags);
+}
+
+
+static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
+{
+ struct ir_table *ir_table;
+ struct page *pages;
+
+ ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table),
+ GFP_KERNEL);
+
+ if (!iommu->ir_table)
+ return -ENOMEM;
+
+ pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, INTR_REMAP_PAGE_ORDER);
+
+ if (!pages) {
+ printk(KERN_ERR "failed to allocate pages of order %d\n",
+ INTR_REMAP_PAGE_ORDER);
+ kfree(iommu->ir_table);
+ return -ENOMEM;
+ }
+
+ ir_table->base = page_address(pages);
+
+ iommu_set_intr_remapping(iommu, mode);
+ return 0;
+}
+
+int __init enable_intr_remapping(int eim)
+{
+ struct dmar_drhd_unit *drhd;
+ int setup = 0;
+
+ /*
+ * check for the Interrupt-remapping support
+ */
+ for_each_drhd_unit(drhd) {
+ struct intel_iommu *iommu = drhd->iommu;
+
+ if (!ecap_ir_support(iommu->ecap))
+ continue;
+
+ if (eim && !ecap_eim_support(iommu->ecap)) {
+ printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, "
+ " ecap %Lx\n", drhd->reg_base_addr, iommu->ecap);
+ return -1;
+ }
+ }
+
+ /*
+ * Enable queued invalidation for all the DRHD's.
+ */
+ for_each_drhd_unit(drhd) {
+ int ret;
+ struct intel_iommu *iommu = drhd->iommu;
+ ret = dmar_enable_qi(iommu);
+
+ if (ret) {
+ printk(KERN_ERR "DRHD %Lx: failed to enable queued, "
+ " invalidation, ecap %Lx, ret %d\n",
+ drhd->reg_base_addr, iommu->ecap, ret);
+ return -1;
+ }
+ }
+
+ /*
+ * Setup Interrupt-remapping for all the DRHD's now.
+ */
+ for_each_drhd_unit(drhd) {
+ struct intel_iommu *iommu = drhd->iommu;
+
+ if (!ecap_ir_support(iommu->ecap))
+ continue;
+
+ if (setup_intr_remapping(iommu, eim))
+ goto error;
+
+ setup = 1;
+ }
+
+ if (!setup)
+ goto error;
+
+ intr_remapping_enabled = 1;
+
+ return 0;
+
+error:
+ /*
+ * handle error condition gracefully here!
+ */
+ return -1;
+}
static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
struct intel_iommu *iommu)