linux-next: manual merge of the tip tree with the iommu tree

Michael Ellerman
2015-06-17T03:22:56Z

Hi all,

Today's linux-next merge of the tip tree got conflicts in:

drivers/iommu/intel_irq_remapping.c
drivers/iommu/dmar.c

between commits:

af3b358e4811 "iommu/vt-d: Copy IR table from old kernel when in kdump mode"
23256d0b3500 "iommu/vt-d: Move EIM detection to intel_prepare_irq_remapping"
9f10e5bf62f7 "iommu/vt-d: Cleanup log messages"

from the iommu tree and commits:

8dedf4cf5a52 "irq_remapping/vt-d: Change prototypes to prepare for hierarchical irqdomain"
b106ee63abcc "irq_remapping/vt-d: Enhance Intel IR driver to support hierarchical irqdomains"
3d9b98f4ec17 "iommu, x86: Setup Posted-Interrupts capability for Intel iommu"
3c6e567509ed "irq_remapping/vt-d: Clean up unsued code"
34742db8eaf9 "iommu/vt-d: Refine the interfaces to create IRQ for DMAR unit"

from the tip tree.

Or something like that, it was a bit of a mess. Given the size of the conflict
I doubt I got it right, but it does seem to build.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

cheers

diff --cc drivers/iommu/dmar.c
index c5886582b64f,536f2d8ea41a..000000000000
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@@ -1642,26 -1642,17 +1642,17 @@@ int dmar_set_interrupt(struct intel_iom
if (iommu->irq)
return 0;

- irq = dmar_alloc_hwirq();
- if (irq <= 0) {
+ irq = dmar_alloc_hwirq(iommu->seq_id, iommu->node, iommu);
+ if (irq > 0) {
+ iommu->irq = irq;
+ } else {
- pr_err("IOMMU: no free vectors\n");
+ pr_err("No free IRQ vectors\n");
return -EINVAL;
}

- irq_set_handler_data(irq, iommu);
- iommu->irq = irq;
-
- ret = arch_setup_dmar_msi(irq);
- if (ret) {
- irq_set_handler_data(irq, NULL);
- iommu->irq = 0;
- dmar_free_hwirq(irq);
- return ret;
- }
-
ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu);
if (ret)
- pr_err("IOMMU: can't request irq\n");
+ pr_err("Can't request irq\n");
return ret;
}

diff --cc drivers/iommu/intel_irq_remapping.c
index 47fcebf39e9e,80f1d1486247..000000000000
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@@ -11,7 -8,7 +11,8 @@@
#include <linux/irq.h>
#include <linux/intel-iommu.h>
#include <linux/acpi.h>
+#include <linux/crash_dump.h>
+ #include <linux/irqdomain.h>
#include <asm/io_apic.h>
#include <asm/smp.h>
#include <asm/cpu.h>
@@@ -54,63 -72,14 +76,34 @@@ static struct hpet_scope ir_hpet[MAX_HP
* the dmar_global_lock.
*/
static DEFINE_RAW_SPINLOCK(irq_2_ir_lock);
+ static struct irq_domain_ops intel_ir_domain_ops;

+static void iommu_disable_irq_remapping(struct intel_iommu *iommu);
static int __init parse_ioapics_under_ir(void);

+static bool ir_pre_enabled(struct intel_iommu *iommu)
+{
+ return (iommu->flags & VTD_FLAG_IRQ_REMAP_PRE_ENABLED);
+}
+
+static void clear_ir_pre_enabled(struct intel_iommu *iommu)
+{
+ iommu->flags &= ~VTD_FLAG_IRQ_REMAP_PRE_ENABLED;
+}
+
+static void init_ir_status(struct intel_iommu *iommu)
+{
+ u32 gsts;
+
+ gsts = readl(iommu->reg + DMAR_GSTS_REG);
+ if (gsts & DMA_GSTS_IRES)
+ iommu->flags |= VTD_FLAG_IRQ_REMAP_PRE_ENABLED;
+}
+
- static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
- {
- struct irq_cfg *cfg = irq_cfg(irq);
- return cfg ? &cfg->irq_2_iommu : NULL;
- }
-
- static int get_irte(int irq, struct irte *entry)
- {
- struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
- unsigned long flags;
- int index;
-
- if (!entry || !irq_iommu)
- return -1;
-
- raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
-
- if (unlikely(!irq_iommu->iommu)) {
- raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
- return -1;
- }
-
- index = irq_iommu->irte_index + irq_iommu->sub_handle;
- *entry = *(irq_iommu->iommu->ir_table->base + index);
-
- raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
- return 0;
- }
-
- static int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
+ static int alloc_irte(struct intel_iommu *iommu, int irq,
+ struct irq_2_iommu *irq_iommu, u16 count)
{
struct ir_table *table = iommu->ir_table;
- struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
- struct irq_cfg *cfg = irq_cfg(irq);
unsigned int mask = 0;
unsigned long flags;
int index;
@@@ -728,34 -569,10 +680,30 @@@ static int __init intel_prepare_irq_rem
if (!ecap_ir_support(iommu->ecap))
goto error;

+ /* Detect remapping mode: lapic or x2apic */
+ if (x2apic_supported()) {
+ eim = !dmar_x2apic_optout();
+ if (!eim) {
+ pr_info("x2apic is disabled because BIOS sets x2apic opt out bit.");
+ pr_info("Use 'intremap=no_x2apic_optout' to override the BIOS setting.\n");
+ }
+ }
+
+ for_each_iommu(iommu, drhd) {
+ if (eim && !ecap_eim_support(iommu->ecap)) {
+ pr_info("%s does not support EIM\n", iommu->name);
+ eim = 0;
+ }
+ }
+
+ eim_mode = eim;
+ if (eim)
+ pr_info("Queued invalidation will be enabled to support x2apic and Intr-remapping.\n");
+
- /* Do the initializations early */
- for_each_iommu(iommu, drhd) {
- if (intel_setup_irq_remapping(iommu)) {
- pr_err("Failed to setup irq remapping for %s\n",
- iommu->name);
+ /* Do the allocations early */
+ for_each_iommu(iommu, drhd)
+ if (intel_setup_irq_remapping(iommu))
goto error;
- }
- }

return 0;

@@@ -784,16 -676,11 +752,11 @@@ static int __init intel_enable_irq_rema

irq_remapping_enabled = 1;

- /*
- * VT-d has a different layout for IO-APIC entries when
- * interrupt remapping is enabled. So it needs a special routine
- * to print IO-APIC entries for debugging purposes too.
- */
- x86_io_apic_ops.print_entries = intel_ir_io_apic_print_entries;
+ set_irq_posting_cap();

- pr_info("Enabled IRQ remapping in %s mode\n", eim ? "x2apic" : "xapic");
+ pr_info("Enabled IRQ remapping in %s mode\n", eim_mode ? "x2apic" : "xapic");

- return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
+ return eim_mode ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;

error:
intel_cleanup_irq_remapping();