# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxxxx>
# Date 1313226898 -3600
# Node ID 8d6edc3d26d26931f3732a2008fb4818bc7bab2d
# Parent 68b903bb1b01b2a6ef9c6e8ead3be3c1c2208341
x86/PCI-MSI: properly determine VF BAR values
As was discussed a couple of times on this list, SR-IOV virtual
functions have their BARs read as zero - the physical function's
SR-IOV capability structure must be consulted instead. The bogus
warnings people complained about are being eliminated with this
change.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
diff -r 68b903bb1b01 -r 8d6edc3d26d2 xen/arch/x86/msi.c
--- a/xen/arch/x86/msi.c Sat Aug 13 10:14:28 2011 +0100
+++ b/xen/arch/x86/msi.c Sat Aug 13 10:14:58 2011 +0100
@@ -522,12 +522,48 @@
return 0;
}
-static u64 read_pci_mem_bar(u8 bus, u8 slot, u8 func, u8 bir)
+static u64 read_pci_mem_bar(u8 bus, u8 slot, u8 func, u8 bir, int vf)
{
u8 limit;
- u32 addr;
+ u32 addr, base = PCI_BASE_ADDRESS_0, disp = 0;
- switch ( pci_conf_read8(bus, slot, func, PCI_HEADER_TYPE) & 0x7f )
+ if ( vf >= 0 )
+ {
+ struct pci_dev *pdev = pci_get_pdev(bus, PCI_DEVFN(slot, func));
+ unsigned int pos = pci_find_ext_capability(0, bus,
+ PCI_DEVFN(slot, func),
+ PCI_EXT_CAP_ID_SRIOV);
+ u16 ctrl = pci_conf_read16(bus, slot, func, pos + PCI_SRIOV_CTRL);
+ u16 num_vf = pci_conf_read16(bus, slot, func, pos + PCI_SRIOV_NUM_VF);
+ u16 offset = pci_conf_read16(bus, slot, func,
+ pos + PCI_SRIOV_VF_OFFSET);
+ u16 stride = pci_conf_read16(bus, slot, func,
+ pos + PCI_SRIOV_VF_STRIDE);
+
+ if ( !pdev || !pos ||
+ !(ctrl & PCI_SRIOV_CTRL_VFE) ||
+ !(ctrl & PCI_SRIOV_CTRL_MSE) ||
+ !num_vf || !offset || (num_vf > 1 && !stride) ||
+ bir >= PCI_SRIOV_NUM_BARS ||
+ !pdev->vf_rlen[bir] )
+ return 0;
+ base = pos + PCI_SRIOV_BAR;
+ vf -= PCI_BDF(bus, slot, func) + offset;
+ if ( vf < 0 || (vf && vf % stride) )
+ return 0;
+ if ( stride )
+ {
+ if ( vf % stride )
+ return 0;
+ vf /= stride;
+ }
+ if ( vf >= num_vf )
+ return 0;
+ BUILD_BUG_ON(ARRAY_SIZE(pdev->vf_rlen) != PCI_SRIOV_NUM_BARS);
+ disp = vf * pdev->vf_rlen[bir];
+ limit = PCI_SRIOV_NUM_BARS;
+ }
+ else switch ( pci_conf_read8(bus, slot, func, PCI_HEADER_TYPE) & 0x7f )
{
case PCI_HEADER_TYPE_NORMAL:
limit = 6;
@@ -544,7 +580,7 @@
if ( bir >= limit )
return 0;
- addr = pci_conf_read32(bus, slot, func, PCI_BASE_ADDRESS_0 + bir * 4);
+ addr = pci_conf_read32(bus, slot, func, base + bir * 4);
if ( (addr & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO )
return 0;
if ( (addr & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
PCI_BASE_ADDRESS_MEM_TYPE_64 )
@@ -552,11 +588,10 @@
addr &= PCI_BASE_ADDRESS_MEM_MASK;
if ( ++bir >= limit )
return 0;
- return addr |
- ((u64)pci_conf_read32(bus, slot, func,
- PCI_BASE_ADDRESS_0 + bir * 4) << 32);
+ return addr + disp +
+ ((u64)pci_conf_read32(bus, slot, func, base + bir * 4) << 32);
}
- return addr & PCI_BASE_ADDRESS_MEM_MASK;
+ return (addr & PCI_BASE_ADDRESS_MEM_MASK) + disp;
}
/**
@@ -629,11 +664,29 @@
if ( !dev->msix_nr_entries )
{
+ u8 pbus, pslot, pfunc;
+ int vf;
u64 pba_paddr;
u32 pba_offset;
+ if ( !dev->info.is_virtfn )
+ {
+ pbus = bus;
+ pslot = slot;
+ pfunc = func;
+ vf = -1;
+ }
+ else
+ {
+ pbus = dev->info.physfn.bus;
+ pslot = PCI_SLOT(dev->info.physfn.devfn);
+ pfunc = PCI_FUNC(dev->info.physfn.devfn);
+ vf = PCI_BDF2(dev->bus, dev->devfn);
+ }
+
ASSERT(!dev->msix_used_entries);
- WARN_ON(msi->table_base != read_pci_mem_bar(bus, slot, func, bir));
+ WARN_ON(msi->table_base !=
+ read_pci_mem_bar(pbus, pslot, pfunc, bir, vf));
dev->msix_nr_entries = nr_entries;
dev->msix_table.first = PFN_DOWN(table_paddr);
@@ -645,7 +698,7 @@
pba_offset = pci_conf_read32(bus, slot, func,
msix_pba_offset_reg(pos));
bir = (u8)(pba_offset & PCI_MSIX_BIRMASK);
- pba_paddr = read_pci_mem_bar(bus, slot, func, bir);
+ pba_paddr = read_pci_mem_bar(pbus, pslot, pfunc, bir, vf);
WARN_ON(!pba_paddr);
pba_paddr += pba_offset & ~PCI_MSIX_BIRMASK;
diff -r 68b903bb1b01 -r 8d6edc3d26d2 xen/drivers/passthrough/pci.c
--- a/xen/drivers/passthrough/pci.c Sat Aug 13 10:14:28 2011 +0100
+++ b/xen/drivers/passthrough/pci.c Sat Aug 13 10:14:58 2011 +0100
@@ -146,6 +146,7 @@
int pci_add_device(u8 bus, u8 devfn, const struct pci_dev_info *info)
{
struct pci_dev *pdev;
+ unsigned int slot = PCI_SLOT(devfn), func = PCI_FUNC(devfn);
const char *pdev_type;
int ret = -ENOMEM;
@@ -154,7 +155,14 @@
else if (info->is_extfn)
pdev_type = "extended function";
else if (info->is_virtfn)
+ {
+ spin_lock(&pcidevs_lock);
+ pdev = pci_get_pdev(info->physfn.bus, info->physfn.devfn);
+ spin_unlock(&pcidevs_lock);
+ if ( !pdev )
+ pci_add_device(info->physfn.bus, info->physfn.devfn, NULL);
pdev_type = "virtual function";
+ }
else
return -EINVAL;
@@ -165,6 +173,70 @@
if ( info )
pdev->info = *info;
+ else if ( !pdev->vf_rlen[0] )
+ {
+ unsigned int pos = pci_find_ext_capability(0, bus, devfn,
+ PCI_EXT_CAP_ID_SRIOV);
+ u16 ctrl = pci_conf_read16(bus, slot, func, pos + PCI_SRIOV_CTRL);
+
+ if ( !pos )
+ /* Nothing */;
+ else if ( !(ctrl & (PCI_SRIOV_CTRL_VFE | PCI_SRIOV_CTRL_MSE)) )
+ {
+ unsigned int i;
+
+ BUILD_BUG_ON(ARRAY_SIZE(pdev->vf_rlen) != PCI_SRIOV_NUM_BARS);
+ for ( i = 0; i < PCI_SRIOV_NUM_BARS; ++i )
+ {
+ unsigned int idx = pos + PCI_SRIOV_BAR + i * 4;
+ u32 bar = pci_conf_read32(bus, slot, func, idx);
+ u32 hi = 0;
+
+ if ( (bar & PCI_BASE_ADDRESS_SPACE) ==
+ PCI_BASE_ADDRESS_SPACE_IO )
+ {
+ printk(XENLOG_WARNING "SR-IOV device %02x:%02x.%x with vf"
+ " BAR%u in IO space\n",
+ bus, slot, func, i);
+ continue;
+ }
+ pci_conf_write32(bus, slot, func, idx, ~0);
+ if ( (bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
+ PCI_BASE_ADDRESS_MEM_TYPE_64 )
+ {
+ if ( i >= PCI_SRIOV_NUM_BARS )
+ {
+ printk(XENLOG_WARNING "SR-IOV device %02x:%02x.%x with"
+ " 64-bit vf BAR in last slot\n",
+ bus, slot, func);
+ break;
+ }
+ hi = pci_conf_read32(bus, slot, func, idx + 4);
+ pci_conf_write32(bus, slot, func, idx + 4, ~0);
+ }
+ pdev->vf_rlen[i] = pci_conf_read32(bus, slot, func, idx) &
+ PCI_BASE_ADDRESS_MEM_MASK;
+ if ( (bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
+ PCI_BASE_ADDRESS_MEM_TYPE_64 )
+ {
+ pdev->vf_rlen[i] |= (u64)pci_conf_read32(bus, slot, func,
+ idx + 4) << 32;
+ pci_conf_write32(bus, slot, func, idx + 4, hi);
+ }
+ else if ( pdev->vf_rlen[i] )
+ pdev->vf_rlen[i] |= (u64)~0 << 32;
+ pci_conf_write32(bus, slot, func, idx, bar);
+ pdev->vf_rlen[i] = -pdev->vf_rlen[i];
+ if ( (bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK) ==
+ PCI_BASE_ADDRESS_MEM_TYPE_64 )
+ ++i;
+ }
+ }
+ else
+ printk(XENLOG_WARNING "SR-IOV device %02x:%02x.%x has its virtual"
+ " functions already enabled (%04x)\n",
+ bus, slot, func, ctrl);
+ }
ret = 0;
if ( !pdev->domain )
@@ -184,7 +256,7 @@
out:
spin_unlock(&pcidevs_lock);
printk(XENLOG_DEBUG "PCI add %s %02x:%02x.%x\n", pdev_type,
- bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+ bus, slot, func);
return ret;
}
diff -r 68b903bb1b01 -r 8d6edc3d26d2 xen/include/xen/pci.h
--- a/xen/include/xen/pci.h Sat Aug 13 10:14:28 2011 +0100
+++ b/xen/include/xen/pci.h Sat Aug 13 10:14:58 2011 +0100
@@ -59,6 +59,7 @@
const u8 bus;
const u8 devfn;
struct pci_dev_info info;
+ u64 vf_rlen[6];
};
#define for_each_pdev(domain, pdev) \
diff -r 68b903bb1b01 -r 8d6edc3d26d2 xen/include/xen/pci_regs.h
--- a/xen/include/xen/pci_regs.h Sat Aug 13 10:14:28 2011 +0100
+++ b/xen/include/xen/pci_regs.h Sat Aug 13 10:14:58 2011 +0100
@@ -425,7 +425,7 @@
#define PCI_EXT_CAP_ID_ACS 13
#define PCI_EXT_CAP_ID_ARI 14
#define PCI_EXT_CAP_ID_ATS 15
-#define PCI_EXT_CAP_ID_IOV 16
+#define PCI_EXT_CAP_ID_SRIOV 16
/* Advanced Error Reporting */
#define PCI_ERR_UNCOR_STATUS 4 /* Uncorrectable Error Status */
@@ -545,4 +545,35 @@
#define PCI_ACS_CTRL 0x06 /* ACS Control Register */
#define PCI_ACS_EGRESS_CTL_V 0x08 /* ACS Egress Control Vector */
+/* Single Root I/O Virtualization */
+#define PCI_SRIOV_CAP 0x04 /* SR-IOV Capabilities */
+#define PCI_SRIOV_CAP_VFM 0x01 /* VF Migration Capable */
+#define PCI_SRIOV_CAP_INTR(x) ((x) >> 21) /* Interrupt Message Number */
+#define PCI_SRIOV_CTRL 0x08 /* SR-IOV Control */
+#define PCI_SRIOV_CTRL_VFE 0x01 /* VF Enable */
+#define PCI_SRIOV_CTRL_VFM 0x02 /* VF Migration Enable */
+#define PCI_SRIOV_CTRL_INTR 0x04 /* VF Migration Interrupt Enable */
+#define PCI_SRIOV_CTRL_MSE 0x08 /* VF Memory Space Enable */
+#define PCI_SRIOV_CTRL_ARI 0x10 /* ARI Capable Hierarchy */
+#define PCI_SRIOV_STATUS 0x0a /* SR-IOV Status */
+#define PCI_SRIOV_STATUS_VFM 0x01 /* VF Migration Status */
+#define PCI_SRIOV_INITIAL_VF 0x0c /* Initial VFs */
+#define PCI_SRIOV_TOTAL_VF 0x0e /* Total VFs */
+#define PCI_SRIOV_NUM_VF 0x10 /* Number of VFs */
+#define PCI_SRIOV_FUNC_LINK 0x12 /* Function Dependency Link */
+#define PCI_SRIOV_VF_OFFSET 0x14 /* First VF Offset */
+#define PCI_SRIOV_VF_STRIDE 0x16 /* Following VF Stride */
+#define PCI_SRIOV_VF_DID 0x1a /* VF Device ID */
+#define PCI_SRIOV_SUP_PGSIZE 0x1c /* Supported Page Sizes */
+#define PCI_SRIOV_SYS_PGSIZE 0x20 /* System Page Size */
+#define PCI_SRIOV_BAR 0x24 /* VF BAR0 */
+#define PCI_SRIOV_NUM_BARS 6 /* Number of VF BARs */
+#define PCI_SRIOV_VFM 0x3c /* VF Migration State Array Offset*/
+#define PCI_SRIOV_VFM_BIR(x) ((x) & 7) /* State BIR */
+#define PCI_SRIOV_VFM_OFFSET(x) ((x) & ~7) /* State Offset */
+#define PCI_SRIOV_VFM_UA 0x0 /* Inactive.Unavailable */
+#define PCI_SRIOV_VFM_MI 0x1 /* Dormant.MigrateIn */
+#define PCI_SRIOV_VFM_MO 0x2 /* Active.MigrateOut */
+#define PCI_SRIOV_VFM_AV 0x3 /* Active.Available */
+
#endif /* LINUX_PCI_REGS_H */
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