DMAR test is based on QEMU edu device. A 4B DMA memory copy is carried
out as the simplest DMAR test.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
lib/pci.h | 5 ++
lib/x86/intel-iommu.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++
lib/x86/intel-iommu.h | 23 +++++++++
x86/Makefile.common | 1 +
x86/intel-iommu.c | 51 +++++++++++++++++++
5 files changed, 212 insertions(+)
diff --git a/lib/pci.h b/lib/pci.h
index d3052ef..26968b1 100644
--- a/lib/pci.h
+++ b/lib/pci.h
@@ -18,6 +18,9 @@ enum {
#define PCI_BAR_NUM 6
#define PCI_DEVFN_MAX 256
+#define PCI_BDF_GET_DEVFN(x) ((x) & 0xff)
+#define PCI_BDF_GET_BUS(x) (((x) >> 8) & 0xff)
+
struct pci_dev {
uint16_t bdf;
phys_addr_t resource[PCI_BAR_NUM];
@@ -28,6 +31,8 @@ extern void pci_scan_bars(struct pci_dev *dev);
extern void pci_cmd_set_clr(struct pci_dev *dev, uint16_t set, uint16_t clr);
extern void pci_enable_defaults(struct pci_dev *dev);
+typedef phys_addr_t iova_t;
+
extern bool pci_probe(void);
extern void pci_print(void);
extern bool pci_dev_exists(pcidevaddr_t dev);
diff --git a/lib/x86/intel-iommu.c b/lib/x86/intel-iommu.c
index 9890f34..48fb2a7 100644
--- a/lib/x86/intel-iommu.c
+++ b/lib/x86/intel-iommu.c
@@ -11,6 +11,42 @@
*/
#include "intel-iommu.h"
+#include "libcflat.h"
+
+/*
+ * VT-d in QEMU currently only support 39 bits address width, which is
+ * 3-level translation.
+ */
+#define VTD_PAGE_LEVEL 3
+#define VTD_CE_AW_39BIT 0x1
+
+typedef uint64_t vtd_pte_t;
+
+struct vtd_root_entry {
+ /* Quad 1 */
+ uint64_t present:1;
+ uint64_t __reserved:11;
+ uint64_t context_table_p:52;
+ /* Quad 2 */
+ uint64_t __reserved_2;
+} __attribute__ ((packed));
+typedef struct vtd_root_entry vtd_re_t;
+
+struct vtd_context_entry {
+ /* Quad 1 */
+ uint64_t present:1;
+ uint64_t disable_fault_report:1;
+ uint64_t trans_type:2;
+ uint64_t __reserved:8;
+ uint64_t slptptr:52;
+ /* Quad 2 */
+ uint64_t addr_width:3;
+ uint64_t __ignore:4;
+ uint64_t __reserved_2:1;
+ uint64_t domain_id:16;
+ uint64_t __reserved_3:40;
+} __attribute__ ((packed));
+typedef struct vtd_context_entry vtd_ce_t;
#define VTD_RTA_MASK (PAGE_MASK)
#define VTD_IRTA_MASK (PAGE_MASK)
@@ -74,6 +110,102 @@ static void vtd_setup_ir_table(void)
printf("IR table address: 0x%016lx\n", vtd_ir_table());
}
+static void vtd_install_pte(vtd_pte_t *root, iova_t iova,
+ phys_addr_t pa, int level_target)
+{
+ int level;
+ unsigned int offset;
+ void *page;
+
+ for (level = VTD_PAGE_LEVEL; level > level_target; level--) {
+ offset = PGDIR_OFFSET(iova, level);
+ if (!(root[offset] & VTD_PTE_RW)) {
+ page = alloc_page();
+ memset(page, 0, PAGE_SIZE);
+ root[offset] = virt_to_phys(page) | VTD_PTE_RW;
+ }
+ root = (uint64_t *)(root[offset] & VTD_PTE_ADDR);
+ }
+
+ offset = PGDIR_OFFSET(iova, level);
+ root[offset] = pa | VTD_PTE_RW;
+ if (level != 1) {
+ /* This is huge page */
+ root[offset] |= VTD_PTE_HUGE;
+ }
+}
+
+#define VTD_FETCH_VIRT_ADDR(x) \
+ ((void *)(((uint64_t)phys_to_virt(x)) >> PAGE_SHIFT))
+
+/**
+ * vtd_map_range: setup IO address mapping for specific memory range
+ *
+ * @sid: source ID of the device to setup
+ * @iova: start IO virtual address
+ * @pa: start physical address
+ * @size: size of the mapping area
+ */
+void vtd_map_range(uint16_t sid, iova_t iova, phys_addr_t pa, size_t size)
+{
+ uint8_t bus_n, devfn;
+ void *slptptr;
+ vtd_ce_t *ce;
+ vtd_re_t *re = phys_to_virt(vtd_root_table());
+
+ assert(IS_ALIGNED(iova, SZ_4K));
+ assert(IS_ALIGNED(pa, SZ_4K));
+ assert(IS_ALIGNED(size, SZ_4K));
+
+ bus_n = PCI_BDF_GET_BUS(sid);
+ devfn = PCI_BDF_GET_DEVFN(sid);
+
+ /* Point to the correct root entry */
+ re += bus_n;
+
+ if (!re->present) {
+ ce = alloc_page();
+ memset(ce, 0, PAGE_SIZE);
+ memset(re, 0, sizeof(*re));
+ re->context_table_p = virt_to_phys(ce) >> PAGE_SHIFT;
+ re->present = 1;
+ printf("allocated vt-d root entry for PCI bus %d\n",
+ bus_n);
+ } else
+ ce = VTD_FETCH_VIRT_ADDR(re->context_table_p);
+
+ /* Point to the correct context entry */
+ ce += devfn;
+
+ if (!ce->present) {
+ slptptr = alloc_page();
+ memset(slptptr, 0, PAGE_SIZE);
+ memset(ce, 0, sizeof(*ce));
+ /* To make it simple, domain ID is the same as SID */
+ ce->domain_id = sid;
+ /* We only test 39 bits width case (3-level paging) */
+ ce->addr_width = VTD_CE_AW_39BIT;
+ ce->slptptr = virt_to_phys(slptptr) >> PAGE_SHIFT;
+ ce->trans_type = VTD_CONTEXT_TT_MULTI_LEVEL;
+ ce->present = 1;
+ /* No error reporting yet */
+ ce->disable_fault_report = 1;
+ printf("allocated vt-d context entry for devfn 0x%x\n",
+ devfn);
+ } else
+ slptptr = VTD_FETCH_VIRT_ADDR(ce->slptptr);
+
+ while (size) {
+ /* TODO: currently we only map 4K pages (level = 1) */
+ printf("map 4K page IOVA 0x%lx to 0x%lx (sid=0x%04x)\n",
+ iova, pa, sid);
+ vtd_install_pte(slptptr, iova, pa, 1);
+ size -= PAGE_SIZE;
+ iova += PAGE_SIZE;
+ pa += PAGE_SIZE;
+ }
+}
+
void vtd_init(void)
{
setup_vm();
diff --git a/lib/x86/intel-iommu.h b/lib/x86/intel-iommu.h
index fae9ae5..1352639 100644
--- a/lib/x86/intel-iommu.h
+++ b/lib/x86/intel-iommu.h
@@ -20,6 +20,7 @@
#include "isr.h"
#include "smp.h"
#include "desc.h"
+#include "pci.h"
#include "asm/io.h"
#define Q35_HOST_BRIDGE_IOMMU_ADDR 0xfed90000ULL
@@ -91,6 +92,27 @@
#define VTD_GCMD_ONE_SHOT_BITS (VTD_GCMD_IR_TABLE | VTD_GCMD_WBF | \
VTD_GCMD_SFL | VTD_GCMD_ROOT)
+/* Supported Adjusted Guest Address Widths */
+#define VTD_CAP_SAGAW_SHIFT 8
+/* 39-bit AGAW, 3-level page-table */
+#define VTD_CAP_SAGAW_39bit (0x2ULL << VTD_CAP_SAGAW_SHIFT)
+/* 48-bit AGAW, 4-level page-table */
+#define VTD_CAP_SAGAW_48bit (0x4ULL << VTD_CAP_SAGAW_SHIFT)
+#define VTD_CAP_SAGAW VTD_CAP_SAGAW_39bit
+
+/* Both 1G/2M huge pages */
+#define VTD_CAP_SLLPS ((1ULL << 34) | (1ULL << 35))
+
+#define VTD_CONTEXT_TT_MULTI_LEVEL 0
+#define VTD_CONTEXT_TT_DEV_IOTLB 1
+#define VTD_CONTEXT_TT_PASS_THROUGH 2
+
+#define VTD_PTE_R (1 << 0)
+#define VTD_PTE_W (1 << 1)
+#define VTD_PTE_RW (VTD_PTE_R | VTD_PTE_W)
+#define VTD_PTE_ADDR GENMASK_ULL(51, 12)
+#define VTD_PTE_HUGE (1 << 7)
+
#define vtd_reg(reg) ((volatile void *)(Q35_HOST_BRIDGE_IOMMU_ADDR + reg))
static inline void vtd_writel(unsigned int reg, uint32_t value)
@@ -114,5 +136,6 @@ static inline uint64_t vtd_readq(unsigned int reg)
}
void vtd_init(void);
+void vtd_map_range(uint16_t sid, phys_addr_t iova, phys_addr_t pa, size_t size);
#endif
diff --git a/x86/Makefile.common b/x86/Makefile.common
index 356d879..1dad18b 100644
--- a/x86/Makefile.common
+++ b/x86/Makefile.common
@@ -3,6 +3,7 @@
all: test_cases
cflatobjs += lib/pci.o
+cflatobjs += lib/pci-edu.o
cflatobjs += lib/x86/io.o
cflatobjs += lib/x86/smp.o
cflatobjs += lib/x86/vm.o
diff --git a/x86/intel-iommu.c b/x86/intel-iommu.c
index f247913..21fd57f 100644
--- a/x86/intel-iommu.c
+++ b/x86/intel-iommu.c
@@ -11,9 +11,50 @@
*/
#include "intel-iommu.h"
+#include "pci-edu.h"
+
+#define VTD_TEST_DMAR_4B ("DMAR 4B memcpy test")
+
+void vtd_test_dmar(struct pci_edu_dev *dev)
+{
+ void *page = alloc_page();
+
+#define DMA_TEST_WORD (0x12345678)
+ /* Modify the first 4 bytes of the page */
+ *(uint32_t *)page = DMA_TEST_WORD;
+
+ /*
+ * Map the newly allocated page into IOVA address 0 (size 4K)
+ * of the device address space. Root entry and context entry
+ * will be automatically created when needed.
+ */
+ vtd_map_range(dev->pci_dev.bdf, 0, virt_to_phys(page), PAGE_SIZE);
+
+ /*
+ * DMA the first 4 bytes of the page to EDU device buffer
+ * offset 0.
+ */
+ edu_dma(dev, 0, 4, 0, false);
+
+ /*
+ * DMA the first 4 bytes of EDU device buffer into the page
+ * with offset 4 (so it'll be using 4-7 bytes).
+ */
+ edu_dma(dev, 4, 4, 0, true);
+
+ /*
+ * Check data match between 0-3 bytes and 4-7 bytes of the
+ * page.
+ */
+ report(VTD_TEST_DMAR_4B, *((uint32_t *)page + 1) == DMA_TEST_WORD);
+
+ free_page(page);
+}
int main(int argc, char *argv[])
{
+ struct pci_edu_dev dev;
+
vtd_init();
report("fault status check", vtd_readl(DMAR_FSTS_REG) == 0);
@@ -22,6 +63,16 @@ int main(int argc, char *argv[])
report("IR table setup", vtd_readl(DMAR_GSTS_REG) & VTD_GCMD_IR_TABLE);
report("DMAR enablement", vtd_readl(DMAR_GSTS_REG) & VTD_GCMD_DMAR);
report("IR enablement", vtd_readl(DMAR_GSTS_REG) & VTD_GCMD_IR);
+ report("DMAR support 39 bits address width",
+ vtd_readq(DMAR_CAP_REG) & VTD_CAP_SAGAW);
+ report("DMAR support huge pages", vtd_readq(DMAR_CAP_REG) & VTD_CAP_SLLPS);
+
+ if (!edu_init(&dev)) {
+ printf("Please specify \"-device edu\" to do "
+ "further IOMMU tests.\n");
+ report_skip(VTD_TEST_DMAR_4B);
+ } else
+ vtd_test_dmar(&dev);
return report_summary();
}
--
2.7.4
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