x64, x2apic/intr-remap: Intel vt-d, IOMMU code reorganization

code reorganization of the generic Intel vt-d parsing related routines and linux
iommu routines specific to Intel vt-d.

drivers/pci/dmar.c	now contains the generic vt-d parsing related routines
drivers/pci/intel_iommu.c contains the iommu routines specific to vt-d

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>

4 files changed, 264 insertions, 236 deletions

diff --git a/drivers/pci/dma_remapping.h b/drivers/pci/dma_remapping.h
new file mode 100644
index 000000000000..05aac8ef96c7
--- /dev/null
+++ b/drivers/pci/dma_remapping.h
@@ -0,0 +1,155 @@
+#ifndef _DMA_REMAPPING_H
+#define _DMA_REMAPPING_H
+
+/*
+ * We need a fixed PAGE_SIZE of 4K irrespective of
+ * arch PAGE_SIZE for IOMMU page tables.
+ */
+#define PAGE_SHIFT_4K           (12)
+#define PAGE_SIZE_4K            (1UL << PAGE_SHIFT_4K)
+#define PAGE_MASK_4K            (((u64)-1) << PAGE_SHIFT_4K)
+#define PAGE_ALIGN_4K(addr)     (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
+
+#define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT_4K)
+#define DMA_32BIT_PFN           IOVA_PFN(DMA_32BIT_MASK)
+#define DMA_64BIT_PFN           IOVA_PFN(DMA_64BIT_MASK)
+
+
+/*
+ * 0: Present
+ * 1-11: Reserved
+ * 12-63: Context Ptr (12 - (haw-1))
+ * 64-127: Reserved
+ */
+struct root_entry {
+        u64     val;
+        u64     rsvd1;
+};
+#define ROOT_ENTRY_NR (PAGE_SIZE_4K/sizeof(struct root_entry))
+static inline bool root_present(struct root_entry *root)
+{
+        return (root->val & 1);
+}
+static inline void set_root_present(struct root_entry *root)
+{
+        root->val |= 1;
+}
+static inline void set_root_value(struct root_entry *root, unsigned long value)
+{
+        root->val |= value & PAGE_MASK_4K;
+}
+
+struct context_entry;
+static inline struct context_entry *
+get_context_addr_from_root(struct root_entry *root)
+{
+        return (struct context_entry *)
+                (root_present(root)?phys_to_virt(
+                root->val & PAGE_MASK_4K):
+                NULL);
+}
+
+/*
+ * low 64 bits:
+ * 0: present
+ * 1: fault processing disable
+ * 2-3: translation type
+ * 12-63: address space root
+ * high 64 bits:
+ * 0-2: address width
+ * 3-6: aval
+ * 8-23: domain id
+ */
+struct context_entry {
+        u64 lo;
+        u64 hi;
+};
+#define context_present(c) ((c).lo & 1)
+#define context_fault_disable(c) (((c).lo >> 1) & 1)
+#define context_translation_type(c) (((c).lo >> 2) & 3)
+#define context_address_root(c) ((c).lo & PAGE_MASK_4K)
+#define context_address_width(c) ((c).hi &  7)
+#define context_domain_id(c) (((c).hi >> 8) & ((1 << 16) - 1))
+
+#define context_set_present(c) do {(c).lo |= 1;} while (0)
+#define context_set_fault_enable(c) \
+        do {(c).lo &= (((u64)-1) << 2) | 1;} while (0)
+#define context_set_translation_type(c, val) \
+        do { \
+                (c).lo &= (((u64)-1) << 4) | 3; \
+                (c).lo |= ((val) & 3) << 2; \
+        } while (0)
+#define CONTEXT_TT_MULTI_LEVEL 0
+#define context_set_address_root(c, val) \
+        do {(c).lo |= (val) & PAGE_MASK_4K;} while (0)
+#define context_set_address_width(c, val) do {(c).hi |= (val) & 7;} while (0)
+#define context_set_domain_id(c, val) \
+        do {(c).hi |= ((val) & ((1 << 16) - 1)) << 8;} while (0)
+#define context_clear_entry(c) do {(c).lo = 0; (c).hi = 0;} while (0)
+
+/*
+ * 0: readable
+ * 1: writable
+ * 2-6: reserved
+ * 7: super page
+ * 8-11: available
+ * 12-63: Host physcial address
+ */
+struct dma_pte {
+        u64 val;
+};
+#define dma_clear_pte(p)        do {(p).val = 0;} while (0)
+
+#define DMA_PTE_READ (1)
+#define DMA_PTE_WRITE (2)
+
+#define dma_set_pte_readable(p) do {(p).val |= DMA_PTE_READ;} while (0)
+#define dma_set_pte_writable(p) do {(p).val |= DMA_PTE_WRITE;} while (0)
+#define dma_set_pte_prot(p, prot) \
+                do {(p).val = ((p).val & ~3) | ((prot) & 3); } while (0)
+#define dma_pte_addr(p) ((p).val & PAGE_MASK_4K)
+#define dma_set_pte_addr(p, addr) do {\
+                (p).val |= ((addr) & PAGE_MASK_4K); } while (0)
+#define dma_pte_present(p) (((p).val & 3) != 0)
+
+struct intel_iommu;
+
+struct dmar_domain {
+        int     id;                     /* domain id */
+        struct intel_iommu *iommu;      /* back pointer to owning iommu */
+
+        struct list_head devices;       /* all devices' list */
+        struct iova_domain iovad;       /* iova's that belong to this domain */
+
+        struct dma_pte  *pgd;           /* virtual address */
+        spinlock_t      mapping_lock;   /* page table lock */
+        int             gaw;            /* max guest address width */
+
+        /* adjusted guest address width, 0 is level 2 30-bit */
+        int             agaw;
+
+#define DOMAIN_FLAG_MULTIPLE_DEVICES 1
+        int             flags;
+};
+
+/* PCI domain-device relationship */
+struct device_domain_info {
+        struct list_head link;  /* link to domain siblings */
+        struct list_head global; /* link to global list */
+        u8 bus;                 /* PCI bus numer */
+        u8 devfn;               /* PCI devfn number */
+        struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
+        struct dmar_domain *domain; /* pointer to domain */
+};
+
+extern int init_dmars(void);
+extern void free_dmar_iommu(struct intel_iommu *iommu);
+
+#ifndef CONFIG_DMAR_GFX_WA
+static inline void iommu_prepare_gfx_mapping(void)
+{
+        return;
+}
+#endif /* !CONFIG_DMAR_GFX_WA */
+
+#endif
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index f941f609dbf3..c00e387f5b75 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -19,9 +19,11 @@
  * Author: Shaohua Li <shaohua.li@intel.com>
  * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
  *
- * This file implements early detection/parsing of DMA Remapping Devices
+ * This file implements early detection/parsing of Remapping Devices
  * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
  * tables.
+ *
+ * These routines are used by both DMA-remapping and Interrupt-remapping
  */
 
 #include <linux/pci.h>
@@ -300,6 +302,37 @@ parse_dmar_table(void)
         return ret;
 }
 
+int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
+                          struct pci_dev *dev)
+{
+        int index;
+
+        while (dev) {
+                for (index = 0; index < cnt; index++)
+                        if (dev == devices[index])
+                                return 1;
+
+                /* Check our parent */
+                dev = dev->bus->self;
+        }
+
+        return 0;
+}
+
+struct dmar_drhd_unit *
+dmar_find_matched_drhd_unit(struct pci_dev *dev)
+{
+        struct dmar_drhd_unit *drhd = NULL;
+
+        list_for_each_entry(drhd, &dmar_drhd_units, list) {
+                if (drhd->include_all || dmar_pci_device_match(drhd->devices,
+                                                drhd->devices_cnt, dev))
+                        return drhd;
+        }
+
+        return NULL;
+}
+
 
 int __init dmar_table_init(void)
 {
@@ -343,3 +376,58 @@ int __init early_dmar_detect(void)
 
         return (ACPI_SUCCESS(status) ? 1 : 0);
 }
+
+struct intel_iommu *alloc_iommu(struct intel_iommu *iommu,
+                                struct dmar_drhd_unit *drhd)
+{
+        int map_size;
+        u32 ver;
+
+        iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K);
+        if (!iommu->reg) {
+                printk(KERN_ERR "IOMMU: can't map the region\n");
+                goto error;
+        }
+        iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
+        iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
+
+        /* the registers might be more than one page */
+        map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
+                cap_max_fault_reg_offset(iommu->cap));
+        map_size = PAGE_ALIGN_4K(map_size);
+        if (map_size > PAGE_SIZE_4K) {
+                iounmap(iommu->reg);
+                iommu->reg = ioremap(drhd->reg_base_addr, map_size);
+                if (!iommu->reg) {
+                        printk(KERN_ERR "IOMMU: can't map the region\n");
+                        goto error;
+                }
+        }
+
+        ver = readl(iommu->reg + DMAR_VER_REG);
+        pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n",
+                drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
+                iommu->cap, iommu->ecap);
+
+        spin_lock_init(&iommu->register_lock);
+
+        drhd->iommu = iommu;
+        return iommu;
+error:
+        kfree(iommu);
+        return NULL;
+}
+
+void free_iommu(struct intel_iommu *iommu)
+{
+        if (!iommu)
+                return;
+
+#ifdef CONFIG_DMAR
+        free_dmar_iommu(iommu);
+#endif
+
+        if (iommu->reg)
+                iounmap(iommu->reg);
+        kfree(iommu);
+}
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index bb0642318a95..1c0270d3e2e5 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -990,6 +990,8 @@ static int iommu_init_domains(struct intel_iommu *iommu)
                 return -ENOMEM;
         }
 
+        spin_lock_init(&iommu->lock);
+
         /*
          * if Caching mode is set, then invalid translations are tagged
          * with domainid 0. Hence we need to pre-allocate it.
@@ -998,62 +1000,15 @@ static int iommu_init_domains(struct intel_iommu *iommu)
                 set_bit(0, iommu->domain_ids);
         return 0;
 }
-static struct intel_iommu *alloc_iommu(struct intel_iommu *iommu,
-                                        struct dmar_drhd_unit *drhd)
-{
-        int ret;
-        int map_size;
-        u32 ver;
-
-        iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K);
-        if (!iommu->reg) {
-                printk(KERN_ERR "IOMMU: can't map the region\n");
-                goto error;
-        }
-        iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
-        iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
-
-        /* the registers might be more than one page */
-        map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
-                cap_max_fault_reg_offset(iommu->cap));
-        map_size = PAGE_ALIGN_4K(map_size);
-        if (map_size > PAGE_SIZE_4K) {
-                iounmap(iommu->reg);
-                iommu->reg = ioremap(drhd->reg_base_addr, map_size);
-                if (!iommu->reg) {
-                        printk(KERN_ERR "IOMMU: can't map the region\n");
-                        goto error;
-                }
-        }
 
-        ver = readl(iommu->reg + DMAR_VER_REG);
-        pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n",
-                drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
-                iommu->cap, iommu->ecap);
-        ret = iommu_init_domains(iommu);
-        if (ret)
-                goto error_unmap;
-        spin_lock_init(&iommu->lock);
-        spin_lock_init(&iommu->register_lock);
-
-        drhd->iommu = iommu;
-        return iommu;
-error_unmap:
-        iounmap(iommu->reg);
-error:
-        kfree(iommu);
-        return NULL;
-}
 
 static void domain_exit(struct dmar_domain *domain);
-static void free_iommu(struct intel_iommu *iommu)
+
+void free_dmar_iommu(struct intel_iommu *iommu)
 {
         struct dmar_domain *domain;
         int i;
 
-        if (!iommu)
-                return;
-
         i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
         for (; i < cap_ndoms(iommu->cap); ) {
                 domain = iommu->domains[i];
@@ -1078,10 +1033,6 @@ static void free_iommu(struct intel_iommu *iommu)
 
         /* free context mapping */
         free_context_table(iommu);
-
-        if (iommu->reg)
-                iounmap(iommu->reg);
-        kfree(iommu);
 }
 
 static struct dmar_domain * iommu_alloc_domain(struct intel_iommu *iommu)
@@ -1426,37 +1377,6 @@ find_domain(struct pci_dev *pdev)
         return NULL;
 }
 
-static int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
-     struct pci_dev *dev)
-{
-        int index;
-
-        while (dev) {
-                for (index = 0; index < cnt; index++)
-                        if (dev == devices[index])
-                                return 1;
-
-                /* Check our parent */
-                dev = dev->bus->self;
-        }
-
-        return 0;
-}
-
-static struct dmar_drhd_unit *
-dmar_find_matched_drhd_unit(struct pci_dev *dev)
-{
-        struct dmar_drhd_unit *drhd = NULL;
-
-        list_for_each_entry(drhd, &dmar_drhd_units, list) {
-                if (drhd->include_all || dmar_pci_device_match(drhd->devices,
-                                                drhd->devices_cnt, dev))
-                        return drhd;
-        }
-
-        return NULL;
-}
-
 /* domain is initialized */
 static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 {
@@ -1764,6 +1684,10 @@ int __init init_dmars(void)
                         goto error;
                 }
 
+                ret = iommu_init_domains(iommu);
+                if (ret)
+                        goto error;
+
                 /*
                  * TBD:
                  * we could share the same root & context tables
diff --git a/drivers/pci/intel-iommu.h b/drivers/pci/intel-iommu.h
index afc0ad96122e..9e5e98c76c05 100644
--- a/drivers/pci/intel-iommu.h
+++ b/drivers/pci/intel-iommu.h
@@ -27,19 +27,7 @@
 #include <linux/sysdev.h>
 #include "iova.h"
 #include <linux/io.h>
-
-/*
- * We need a fixed PAGE_SIZE of 4K irrespective of
- * arch PAGE_SIZE for IOMMU page tables.
- */
-#define PAGE_SHIFT_4K           (12)
-#define PAGE_SIZE_4K            (1UL << PAGE_SHIFT_4K)
-#define PAGE_MASK_4K            (((u64)-1) << PAGE_SHIFT_4K)
-#define PAGE_ALIGN_4K(addr)     (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
-
-#define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT_4K)
-#define DMA_32BIT_PFN           IOVA_PFN(DMA_32BIT_MASK)
-#define DMA_64BIT_PFN           IOVA_PFN(DMA_64BIT_MASK)
+#include "dma_remapping.h"
 
 /*
  * Intel IOMMU register specification per version 1.0 public spec.
@@ -187,158 +175,31 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define dma_frcd_source_id(c) (c & 0xffff)
 #define dma_frcd_page_addr(d) (d & (((u64)-1) << 12)) /* low 64 bit */
 
-/*
- * 0: Present
- * 1-11: Reserved
- * 12-63: Context Ptr (12 - (haw-1))
- * 64-127: Reserved
- */
-struct root_entry {
-        u64     val;
-        u64     rsvd1;
-};
-#define ROOT_ENTRY_NR (PAGE_SIZE_4K/sizeof(struct root_entry))
-static inline bool root_present(struct root_entry *root)
-{
-        return (root->val & 1);
-}
-static inline void set_root_present(struct root_entry *root)
-{
-        root->val |= 1;
-}
-static inline void set_root_value(struct root_entry *root, unsigned long value)
-{
-        root->val |= value & PAGE_MASK_4K;
-}
-
-struct context_entry;
-static inline struct context_entry *
-get_context_addr_from_root(struct root_entry *root)
-{
-        return (struct context_entry *)
-                (root_present(root)?phys_to_virt(
-                root->val & PAGE_MASK_4K):
-                NULL);
-}
-
-/*
- * low 64 bits:
- * 0: present
- * 1: fault processing disable
- * 2-3: translation type
- * 12-63: address space root
- * high 64 bits:
- * 0-2: address width
- * 3-6: aval
- * 8-23: domain id
- */
-struct context_entry {
-        u64 lo;
-        u64 hi;
-};
-#define context_present(c) ((c).lo & 1)
-#define context_fault_disable(c) (((c).lo >> 1) & 1)
-#define context_translation_type(c) (((c).lo >> 2) & 3)
-#define context_address_root(c) ((c).lo & PAGE_MASK_4K)
-#define context_address_width(c) ((c).hi &  7)
-#define context_domain_id(c) (((c).hi >> 8) & ((1 << 16) - 1))
-
-#define context_set_present(c) do {(c).lo |= 1;} while (0)
-#define context_set_fault_enable(c) \
-        do {(c).lo &= (((u64)-1) << 2) | 1;} while (0)
-#define context_set_translation_type(c, val) \
-        do { \
-                (c).lo &= (((u64)-1) << 4) | 3; \
-                (c).lo |= ((val) & 3) << 2; \
-        } while (0)
-#define CONTEXT_TT_MULTI_LEVEL 0
-#define context_set_address_root(c, val) \
-        do {(c).lo |= (val) & PAGE_MASK_4K;} while (0)
-#define context_set_address_width(c, val) do {(c).hi |= (val) & 7;} while (0)
-#define context_set_domain_id(c, val) \
-        do {(c).hi |= ((val) & ((1 << 16) - 1)) << 8;} while (0)
-#define context_clear_entry(c) do {(c).lo = 0; (c).hi = 0;} while (0)
-
-/*
- * 0: readable
- * 1: writable
- * 2-6: reserved
- * 7: super page
- * 8-11: available
- * 12-63: Host physcial address
- */
-struct dma_pte {
-        u64 val;
-};
-#define dma_clear_pte(p)        do {(p).val = 0;} while (0)
-
-#define DMA_PTE_READ (1)
-#define DMA_PTE_WRITE (2)
-
-#define dma_set_pte_readable(p) do {(p).val |= DMA_PTE_READ;} while (0)
-#define dma_set_pte_writable(p) do {(p).val |= DMA_PTE_WRITE;} while (0)
-#define dma_set_pte_prot(p, prot) \
-                do {(p).val = ((p).val & ~3) | ((prot) & 3); } while (0)
-#define dma_pte_addr(p) ((p).val & PAGE_MASK_4K)
-#define dma_set_pte_addr(p, addr) do {\
-                (p).val |= ((addr) & PAGE_MASK_4K); } while (0)
-#define dma_pte_present(p) (((p).val & 3) != 0)
-
-struct intel_iommu;
-
-struct dmar_domain {
-        int     id;                     /* domain id */
-        struct intel_iommu *iommu;      /* back pointer to owning iommu */
-
-        struct list_head devices;       /* all devices' list */
-        struct iova_domain iovad;       /* iova's that belong to this domain */
-
-        struct dma_pte  *pgd;           /* virtual address */
-        spinlock_t      mapping_lock;   /* page table lock */
-        int             gaw;            /* max guest address width */
-
-        /* adjusted guest address width, 0 is level 2 30-bit */
-        int             agaw;
-
-#define DOMAIN_FLAG_MULTIPLE_DEVICES 1
-        int             flags;
-};
-
-/* PCI domain-device relationship */
-struct device_domain_info {
-        struct list_head link;  /* link to domain siblings */
-        struct list_head global; /* link to global list */
-        u8 bus;                 /* PCI bus numer */
-        u8 devfn;               /* PCI devfn number */
-        struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
-        struct dmar_domain *domain; /* pointer to domain */
-};
-
-extern int init_dmars(void);
-
 struct intel_iommu {
         void __iomem    *reg; /* Pointer to hardware regs, virtual addr */
         u64             cap;
         u64             ecap;
-        unsigned long   *domain_ids; /* bitmap of domains */
-        struct dmar_domain **domains; /* ptr to domains */
         int             seg;
         u32             gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
-        spinlock_t      lock; /* protect context, domain ids */
         spinlock_t      register_lock; /* protect register handling */
+
+#ifdef CONFIG_DMAR
+        unsigned long   *domain_ids; /* bitmap of domains */
+        struct dmar_domain **domains; /* ptr to domains */
+        spinlock_t      lock; /* protect context, domain ids */
         struct root_entry *root_entry; /* virtual address */
 
         unsigned int irq;
         unsigned char name[7];    /* Device Name */
         struct msi_msg saved_msg;
         struct sys_device sysdev;
+#endif
 };
 
-#ifndef CONFIG_DMAR_GFX_WA
-static inline void iommu_prepare_gfx_mapping(void)
-{
-        return;
-}
-#endif /* !CONFIG_DMAR_GFX_WA */
+extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
+
+extern struct intel_iommu *alloc_iommu(struct intel_iommu *iommu,
+                                       struct dmar_drhd_unit *drhd);
+extern void free_iommu(struct intel_iommu *iommu);
 
 #endif