VT-d: Changes to support KVM

This patch extends the VT-d driver to support KVM

[Ben: fixed memory pinning]
[avi: move dma_remapping.h as well]

Signed-off-by: Kay, Allen M <allen.m.kay@intel.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Ben-Ami Yassour <benami@il.ibm.com>
Signed-off-by: Amit Shah <amit.shah@qumranet.com>
Acked-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 327 insertions, 0 deletions

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
new file mode 100644
index 0000000..2e117f3
--- /dev/null
+++ b/include/linux/intel-iommu.h
@@ -0,0 +1,327 @@
+/*
+ * Copyright (c) 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Copyright (C) 2006-2008 Intel Corporation
+ * Author: Ashok Raj <ashok.raj@intel.com>
+ * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
+ */
+
+#ifndef _INTEL_IOMMU_H_
+#define _INTEL_IOMMU_H_
+
+#include <linux/types.h>
+#include <linux/msi.h>
+#include <linux/sysdev.h>
+#include <linux/iova.h>
+#include <linux/io.h>
+#include <linux/dma_remapping.h>
+#include <asm/cacheflush.h>
+
+/*
+ * Intel IOMMU register specification per version 1.0 public spec.
+ */
+
+#define	DMAR_VER_REG	0x0	/* Arch version supported by this IOMMU */
+#define	DMAR_CAP_REG	0x8	/* Hardware supported capabilities */
+#define	DMAR_ECAP_REG	0x10	/* Extended capabilities supported */
+#define	DMAR_GCMD_REG	0x18	/* Global command register */
+#define	DMAR_GSTS_REG	0x1c	/* Global status register */
+#define	DMAR_RTADDR_REG	0x20	/* Root entry table */
+#define	DMAR_CCMD_REG	0x28	/* Context command reg */
+#define	DMAR_FSTS_REG	0x34	/* Fault Status register */
+#define	DMAR_FECTL_REG	0x38	/* Fault control register */
+#define	DMAR_FEDATA_REG	0x3c	/* Fault event interrupt data register */
+#define	DMAR_FEADDR_REG	0x40	/* Fault event interrupt addr register */
+#define	DMAR_FEUADDR_REG 0x44	/* Upper address register */
+#define	DMAR_AFLOG_REG	0x58	/* Advanced Fault control */
+#define	DMAR_PMEN_REG	0x64	/* Enable Protected Memory Region */
+#define	DMAR_PLMBASE_REG 0x68	/* PMRR Low addr */
+#define	DMAR_PLMLIMIT_REG 0x6c	/* PMRR low limit */
+#define	DMAR_PHMBASE_REG 0x70	/* pmrr high base addr */
+#define	DMAR_PHMLIMIT_REG 0x78	/* pmrr high limit */
+#define DMAR_IQH_REG	0x80	/* Invalidation queue head register */
+#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)
+/*
+#define dmar_readl(dmar, reg) readl(dmar + reg)
+#define dmar_readq(dmar, reg) ({ \
+		u32 lo, hi; \
+		lo = readl(dmar + reg); \
+		hi = readl(dmar + reg + 4); \
+		(((u64) hi) << 32) + lo; })
+*/
+static inline u64 dmar_readq(void __iomem *addr)
+{
+	u32 lo, hi;
+	lo = readl(addr);
+	hi = readl(addr + 4);
+	return (((u64) hi) << 32) + lo;
+}
+
+static inline void dmar_writeq(void __iomem *addr, u64 val)
+{
+	writel((u32)val, addr);
+	writel((u32)(val >> 32), addr + 4);
+}
+
+#define DMAR_VER_MAJOR(v)		(((v) & 0xf0) >> 4)
+#define DMAR_VER_MINOR(v)		((v) & 0x0f)
+
+/*
+ * Decoding Capability Register
+ */
+#define cap_read_drain(c)	(((c) >> 55) & 1)
+#define cap_write_drain(c)	(((c) >> 54) & 1)
+#define cap_max_amask_val(c)	(((c) >> 48) & 0x3f)
+#define cap_num_fault_regs(c)	((((c) >> 40) & 0xff) + 1)
+#define cap_pgsel_inv(c)	(((c) >> 39) & 1)
+
+#define cap_super_page_val(c)	(((c) >> 34) & 0xf)
+#define cap_super_offset(c)	(((find_first_bit(&cap_super_page_val(c), 4)) \
+					* OFFSET_STRIDE) + 21)
+
+#define cap_fault_reg_offset(c)	((((c) >> 24) & 0x3ff) * 16)
+#define cap_max_fault_reg_offset(c) \
+	(cap_fault_reg_offset(c) + cap_num_fault_regs(c) * 16)
+
+#define cap_zlr(c)		(((c) >> 22) & 1)
+#define cap_isoch(c)		(((c) >> 23) & 1)
+#define cap_mgaw(c)		((((c) >> 16) & 0x3f) + 1)
+#define cap_sagaw(c)		(((c) >> 8) & 0x1f)
+#define cap_caching_mode(c)	(((c) >> 7) & 1)
+#define cap_phmr(c)		(((c) >> 6) & 1)
+#define cap_plmr(c)		(((c) >> 5) & 1)
+#define cap_rwbf(c)		(((c) >> 4) & 1)
+#define cap_afl(c)		(((c) >> 3) & 1)
+#define cap_ndoms(c)		(((unsigned long)1) << (4 + 2 * ((c) & 0x7)))
+/*
+ * Extended Capability Register
+ */
+
+#define ecap_niotlb_iunits(e)	((((e) >> 24) & 0xff) + 1)
+#define ecap_iotlb_offset(e) 	((((e) >> 8) & 0x3ff) * 16)
+#define ecap_max_iotlb_offset(e) \
+	(ecap_iotlb_offset(e) + ecap_niotlb_iunits(e) * 16)
+#define ecap_coherent(e)	((e) & 0x1)
+#define ecap_qis(e)		((e) & 0x2)
+#define ecap_eim_support(e)	((e >> 4) & 0x1)
+#define ecap_ir_support(e)	((e >> 3) & 0x1)
+#define ecap_max_handle_mask(e) ((e >> 20) & 0xf)
+
+
+/* IOTLB_REG */
+#define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60)
+#define DMA_TLB_DSI_FLUSH (((u64)2) << 60)
+#define DMA_TLB_PSI_FLUSH (((u64)3) << 60)
+#define DMA_TLB_IIRG(type) ((type >> 60) & 7)
+#define DMA_TLB_IAIG(val) (((val) >> 57) & 7)
+#define DMA_TLB_READ_DRAIN (((u64)1) << 49)
+#define DMA_TLB_WRITE_DRAIN (((u64)1) << 48)
+#define DMA_TLB_DID(id)	(((u64)((id) & 0xffff)) << 32)
+#define DMA_TLB_IVT (((u64)1) << 63)
+#define DMA_TLB_IH_NONLEAF (((u64)1) << 6)
+#define DMA_TLB_MAX_SIZE (0x3f)
+
+/* INVALID_DESC */
+#define DMA_ID_TLB_GLOBAL_FLUSH	(((u64)1) << 3)
+#define DMA_ID_TLB_DSI_FLUSH	(((u64)2) << 3)
+#define DMA_ID_TLB_PSI_FLUSH	(((u64)3) << 3)
+#define DMA_ID_TLB_READ_DRAIN	(((u64)1) << 7)
+#define DMA_ID_TLB_WRITE_DRAIN	(((u64)1) << 6)
+#define DMA_ID_TLB_DID(id)	(((u64)((id & 0xffff) << 16)))
+#define DMA_ID_TLB_IH_NONLEAF	(((u64)1) << 6)
+#define DMA_ID_TLB_ADDR(addr)	(addr)
+#define DMA_ID_TLB_ADDR_MASK(mask)	(mask)
+
+/* PMEN_REG */
+#define DMA_PMEN_EPM (((u32)1)<<31)
+#define DMA_PMEN_PRS (((u32)1)<<0)
+
+/* GCMD_REG */
+#define DMA_GCMD_TE (((u32)1) << 31)
+#define DMA_GCMD_SRTP (((u32)1) << 30)
+#define DMA_GCMD_SFL (((u32)1) << 29)
+#define DMA_GCMD_EAFL (((u32)1) << 28)
+#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_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)
+#define DMA_CCMD_GLOBAL_INVL (((u64)1) << 61)
+#define DMA_CCMD_DOMAIN_INVL (((u64)2) << 61)
+#define DMA_CCMD_DEVICE_INVL (((u64)3) << 61)
+#define DMA_CCMD_FM(m) (((u64)((m) & 0x3)) << 32)
+#define DMA_CCMD_MASK_NOBIT 0
+#define DMA_CCMD_MASK_1BIT 1
+#define DMA_CCMD_MASK_2BIT 2
+#define DMA_CCMD_MASK_3BIT 3
+#define DMA_CCMD_SID(s) (((u64)((s) & 0xffff)) << 16)
+#define DMA_CCMD_DID(d) ((u64)((d) & 0xffff))
+
+/* FECTL_REG */
+#define DMA_FECTL_IM (((u32)1) << 31)
+
+/* FSTS_REG */
+#define DMA_FSTS_PPF ((u32)2)
+#define DMA_FSTS_PFO ((u32)1)
+#define dma_fsts_fault_record_index(s) (((s) >> 8) & 0xff)
+
+/* FRCD_REG, 32 bits access */
+#define DMA_FRCD_F (((u32)1) << 31)
+#define dma_frcd_type(d) ((d >> 30) & 1)
+#define dma_frcd_fault_reason(c) (c & 0xff)
+#define dma_frcd_source_id(c) (c & 0xffff)
+#define dma_frcd_page_addr(d) (d & (((u64)-1) << 12)) /* low 64 bit */
+
+#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) /* 10sec */
+
+#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
+{\
+	cycles_t start_time = get_cycles();\
+	while (1) {\
+		sts = op (iommu->reg + offset);\
+		if (cond)\
+			break;\
+		if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
+			panic("DMAR hardware is malfunctioning\n");\
+		cpu_relax();\
+	}\
+}
+
+#define QI_LENGTH	256	/* queue length */
+
+enum {
+	QI_FREE,
+	QI_IN_USE,
+	QI_DONE
+};
+
+#define QI_CC_TYPE		0x1
+#define QI_IOTLB_TYPE		0x2
+#define QI_DIOTLB_TYPE		0x3
+#define QI_IEC_TYPE		0x4
+#define QI_IWD_TYPE		0x5
+
+#define QI_IEC_SELECTIVE	(((u64)1) << 4)
+#define QI_IEC_IIDEX(idx)	(((u64)(idx & 0xffff) << 32))
+#define QI_IEC_IM(m)		(((u64)(m & 0x1f) << 27))
+
+#define QI_IWD_STATUS_DATA(d)	(((u64)d) << 32)
+#define QI_IWD_STATUS_WRITE	(((u64)1) << 5)
+
+struct qi_desc {
+	u64 low, high;
+};
+
+struct q_inval {
+	spinlock_t      q_lock;
+	struct qi_desc  *desc;          /* invalidation queue */
+	int             *desc_status;   /* desc status */
+	int             free_head;      /* first free entry */
+	int             free_tail;      /* last free entry */
+	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
+
+#define INTR_REMAP_TABLE_ENTRIES	65536
+
+struct ir_table {
+	struct irte *base;
+};
+#endif
+
+struct intel_iommu {
+	void __iomem	*reg; /* Pointer to hardware regs, virtual addr */
+	u64		cap;
+	u64		ecap;
+	int		seg;
+	u32		gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
+	spinlock_t	register_lock; /* protect register handling */
+	int		seq_id;	/* sequence id of the iommu */
+
+#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
+	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(
+	struct intel_iommu *iommu, void *addr, int size)
+{
+	if (!ecap_coherent(iommu->ecap))
+		clflush_cache_range(addr, size);
+}
+
+extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
+
+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);
+
+extern void qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);
+
+void intel_iommu_domain_exit(struct dmar_domain *domain);
+struct dmar_domain *intel_iommu_domain_alloc(struct pci_dev *pdev);
+int intel_iommu_context_mapping(struct dmar_domain *domain,
+				struct pci_dev *pdev);
+int intel_iommu_page_mapping(struct dmar_domain *domain, dma_addr_t iova,
+			     u64 hpa, size_t size, int prot);
+void intel_iommu_detach_dev(struct dmar_domain *domain, u8 bus, u8 devfn);
+struct dmar_domain *intel_iommu_find_domain(struct pci_dev *pdev);
+u64 intel_iommu_iova_to_pfn(struct dmar_domain *domain, u64 iova);
+
+#ifdef CONFIG_DMAR
+int intel_iommu_found(void);
+#else /* CONFIG_DMAR */
+static inline int intel_iommu_found(void)
+{
+	return 0;
+}
+#endif /* CONFIG_DMAR */
+
+#endif