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Subject[patch 09/26] 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>
---
Index: tree-x86/drivers/pci/intel-iommu.h
===================================================================
--- tree-x86.orig/drivers/pci/intel-iommu.h 2008-07-10 09:52:01.000000000 -0700
+++ tree-x86/drivers/pci/intel-iommu.h 2008-07-10 09:52:03.000000000 -0700
@@ -56,6 +56,7 @@
#define DMAR_IQT_REG 0x88 /* Invalidation queue tail register */
#define DMAR_IQA_REG 0x90 /* Invalidation queue addr register */
#define DMAR_ICS_REG 0x98 /* Invalidation complete status register */
+#define DMAR_IRTA_REG 0xb8 /* Interrupt remapping table addr register */

#define OFFSET_STRIDE (9)
/*
@@ -157,16 +158,20 @@
#define DMA_GCMD_SRTP (((u32)1) << 30)
#define DMA_GCMD_SFL (((u32)1) << 29)
#define DMA_GCMD_EAFL (((u32)1) << 28)
-#define DMA_GCMD_QIE (((u32)1) << 26)
#define DMA_GCMD_WBF (((u32)1) << 27)
+#define DMA_GCMD_QIE (((u32)1) << 26)
+#define DMA_GCMD_SIRTP (((u32)1) << 24)
+#define DMA_GCMD_IRE (((u32) 1) << 25)

/* GSTS_REG */
#define DMA_GSTS_TES (((u32)1) << 31)
#define DMA_GSTS_RTPS (((u32)1) << 30)
#define DMA_GSTS_FLS (((u32)1) << 29)
#define DMA_GSTS_AFLS (((u32)1) << 28)
-#define DMA_GSTS_QIES (((u32)1) << 26)
#define DMA_GSTS_WBFS (((u32)1) << 27)
+#define DMA_GSTS_QIES (((u32)1) << 26)
+#define DMA_GSTS_IRTPS (((u32)1) << 24)
+#define DMA_GSTS_IRES (((u32)1) << 25)

/* CCMD_REG */
#define DMA_CCMD_ICC (((u64)1) << 63)
@@ -245,6 +250,16 @@
int free_cnt;
};

+#ifdef CONFIG_INTR_REMAP
+/* 1MB - maximum possible interrupt remapping table size */
+#define INTR_REMAP_PAGE_ORDER 8
+#define INTR_REMAP_TABLE_REG_SIZE 0xf
+
+struct ir_table {
+ struct irte *base;
+};
+#endif
+
struct intel_iommu {
void __iomem *reg; /* Pointer to hardware regs, virtual addr */
u64 cap;
@@ -266,6 +281,9 @@
struct sys_device sysdev;
#endif
struct q_inval *qi; /* Queued invalidation info */
+#ifdef CONFIG_INTR_REMAP
+ struct ir_table *ir_table; /* Interrupt remapping info */
+#endif
};

static inline void __iommu_flush_cache(
@@ -279,5 +297,7 @@

extern int alloc_iommu(struct dmar_drhd_unit *drhd);
extern void free_iommu(struct intel_iommu *iommu);
+extern int dmar_enable_qi(struct intel_iommu *iommu);
+extern void qi_global_iec(struct intel_iommu *iommu);

#endif
Index: tree-x86/drivers/pci/intr_remapping.c
===================================================================
--- tree-x86.orig/drivers/pci/intr_remapping.c 2008-07-10 09:51:57.000000000 -0700
+++ tree-x86/drivers/pci/intr_remapping.c 2008-07-10 09:52:03.000000000 -0700
@@ -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)
Index: tree-x86/include/linux/dmar.h
===================================================================
--- tree-x86.orig/include/linux/dmar.h 2008-07-10 09:51:57.000000000 -0700
+++ tree-x86/include/linux/dmar.h 2008-07-10 09:52:03.000000000 -0700
@@ -25,9 +25,85 @@
#include <linux/types.h>
#include <linux/msi.h>

-#ifdef CONFIG_DMAR
+#if defined(CONFIG_DMAR) || defined(CONFIG_INTR_REMAP)
struct intel_iommu;

+struct dmar_drhd_unit {
+ struct list_head list; /* list of drhd units */
+ struct acpi_dmar_header *hdr; /* ACPI header */
+ u64 reg_base_addr; /* register base address*/
+ struct pci_dev **devices; /* target device array */
+ int devices_cnt; /* target device count */
+ u8 ignored:1; /* ignore drhd */
+ u8 include_all:1;
+ struct intel_iommu *iommu;
+};
+
+extern struct list_head dmar_drhd_units;
+
+#define for_each_drhd_unit(drhd) \
+ list_for_each_entry(drhd, &dmar_drhd_units, list)
+
+extern int dmar_table_init(void);
+extern int early_dmar_detect(void);
+extern int dmar_dev_scope_init(void);
+
+/* Intel IOMMU detection */
+extern void detect_intel_iommu(void);
+
+
+extern int parse_ioapics_under_ir(void);
+extern int alloc_iommu(struct dmar_drhd_unit *);
+#else
+static inline void detect_intel_iommu(void)
+{
+ return;
+}
+
+static inline int dmar_table_init(void)
+{
+ return -ENODEV;
+}
+#endif /* !CONFIG_DMAR && !CONFIG_INTR_REMAP */
+
+#ifdef CONFIG_INTR_REMAP
+extern int intr_remapping_enabled;
+extern int enable_intr_remapping(int);
+
+struct irte {
+ union {
+ struct {
+ __u64 present : 1,
+ fpd : 1,
+ dst_mode : 1,
+ redir_hint : 1,
+ trigger_mode : 1,
+ dlvry_mode : 3,
+ avail : 4,
+ __reserved_1 : 4,
+ vector : 8,
+ __reserved_2 : 8,
+ dest_id : 32;
+ };
+ __u64 low;
+ };
+
+ union {
+ struct {
+ __u64 sid : 16,
+ sq : 2,
+ svt : 2,
+ __reserved_3 : 44;
+ };
+ __u64 high;
+ };
+};
+#else
+#define enable_intr_remapping(mode) (-1)
+#define intr_remapping_enabled (0)
+#endif
+
+#ifdef CONFIG_DMAR
extern const char *dmar_get_fault_reason(u8 fault_reason);

/* Can't use the common MSI interrupt functions
@@ -40,29 +116,8 @@
extern int dmar_set_interrupt(struct intel_iommu *iommu);
extern int arch_setup_dmar_msi(unsigned int irq);

-/* Intel IOMMU detection and initialization functions */
-extern void detect_intel_iommu(void);
-extern int intel_iommu_init(void);
-
-extern int dmar_table_init(void);
-extern int early_dmar_detect(void);
-extern int dmar_dev_scope_init(void);
-extern int parse_ioapics_under_ir(void);
-
-extern struct list_head dmar_drhd_units;
+extern int iommu_detected, no_iommu;
extern struct list_head dmar_rmrr_units;
-
-struct dmar_drhd_unit {
- struct list_head list; /* list of drhd units */
- struct acpi_dmar_header *hdr; /* ACPI header */
- u64 reg_base_addr; /* register base address*/
- struct pci_dev **devices; /* target device array */
- int devices_cnt; /* target device count */
- u8 ignored:1; /* ignore drhd */
- u8 include_all:1;
- struct intel_iommu *iommu;
-};
-
struct dmar_rmrr_unit {
struct list_head list; /* list of rmrr units */
struct acpi_dmar_header *hdr; /* ACPI header */
@@ -72,24 +127,19 @@
int devices_cnt; /* target device count */
};

-#define for_each_drhd_unit(drhd) \
- list_for_each_entry(drhd, &dmar_drhd_units, list)
#define for_each_rmrr_units(rmrr) \
list_for_each_entry(rmrr, &dmar_rmrr_units, list)
-
-extern int alloc_iommu(struct dmar_drhd_unit *);
+/* Intel DMAR initialization functions */
+extern int intel_iommu_init(void);
+extern int dmar_disabled;
#else
-static inline void detect_intel_iommu(void)
-{
- return;
-}
static inline int intel_iommu_init(void)
{
+#ifdef CONFIG_INTR_REMAP
+ return dmar_dev_scope_init();
+#else
return -ENODEV;
-}
-static inline int dmar_table_init(void)
-{
- return -ENODEV;
+#endif
}
#endif /* !CONFIG_DMAR */
#endif /* __DMAR_H__ */
Index: tree-x86/drivers/pci/dma_remapping.h
===================================================================
--- tree-x86.orig/drivers/pci/dma_remapping.h 2008-07-10 09:51:46.000000000 -0700
+++ tree-x86/drivers/pci/dma_remapping.h 2008-07-10 09:52:03.000000000 -0700
@@ -145,6 +145,8 @@
extern int init_dmars(void);
extern void free_dmar_iommu(struct intel_iommu *iommu);

+extern int dmar_disabled;
+
#ifndef CONFIG_DMAR_GFX_WA
static inline void iommu_prepare_gfx_mapping(void)
{
Index: tree-x86/drivers/pci/intel-iommu.c
===================================================================
--- tree-x86.orig/drivers/pci/intel-iommu.c 2008-07-10 09:52:01.000000000 -0700
+++ tree-x86/drivers/pci/intel-iommu.c 2008-07-10 09:52:03.000000000 -0700
@@ -76,7 +76,7 @@

static void domain_remove_dev_info(struct dmar_domain *domain);

-static int dmar_disabled;
+int dmar_disabled;
static int __initdata dmar_map_gfx = 1;
static int dmar_forcedac;
static int intel_iommu_strict;
@@ -2238,15 +2238,6 @@

}

-void __init detect_intel_iommu(void)
-{
- if (swiotlb || no_iommu || iommu_detected || dmar_disabled)
- return;
- if (early_dmar_detect()) {
- iommu_detected = 1;
- }
-}
-
static void __init init_no_remapping_devices(void)
{
struct dmar_drhd_unit *drhd;
@@ -2293,15 +2284,19 @@
{
int ret = 0;

- if (no_iommu || swiotlb || dmar_disabled)
- return -ENODEV;
-
if (dmar_table_init())
return -ENODEV;

if (dmar_dev_scope_init())
return -ENODEV;

+ /*
+ * Check the need for DMA-remapping initialization now.
+ * Above initialization will also be used by Interrupt-remapping.
+ */
+ if (no_iommu || swiotlb || dmar_disabled)
+ return -ENODEV;
+
iommu_init_mempool();
dmar_init_reserved_ranges();

Index: tree-x86/drivers/pci/intr_remapping.h
===================================================================
--- tree-x86.orig/drivers/pci/intr_remapping.h 2008-07-10 09:51:57.000000000 -0700
+++ tree-x86/drivers/pci/intr_remapping.h 2008-07-10 09:52:03.000000000 -0700
@@ -4,3 +4,5 @@
struct intel_iommu *iommu;
unsigned int id;
};
+
+#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)
Index: tree-x86/drivers/pci/dmar.c
===================================================================
--- tree-x86.orig/drivers/pci/dmar.c 2008-07-10 09:52:01.000000000 -0700
+++ tree-x86/drivers/pci/dmar.c 2008-07-10 09:52:03.000000000 -0700
@@ -449,6 +449,22 @@
return (ACPI_SUCCESS(status) ? 1 : 0);
}

+void __init detect_intel_iommu(void)
+{
+ int ret;
+
+ ret = early_dmar_detect();
+
+#ifdef CONFIG_DMAR
+ {
+ if (ret && !no_iommu && !iommu_detected && !swiotlb &&
+ !dmar_disabled)
+ iommu_detected = 1;
+ }
+#endif
+}
+
+
int alloc_iommu(struct dmar_drhd_unit *drhd)
{
struct intel_iommu *iommu;
--



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