[RFC PATCH 08/20] x86/xen/MSI: Use msi_chip instead of arch func to configure MSI/MSI-X
Yijing Wang
wangyijing at huawei.com
Tue Aug 12 00:26:01 PDT 2014
Introduce a new struct msi_chip xen_msi_chip instead of weak arch
functions to configure MSI/MSI-X.
Signed-off-by: Yijing Wang <wangyijing at huawei.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk at oracle.com>
---
arch/x86/pci/xen.c | 128 +++++++++++++++++++++++++++++----------------------
1 files changed, 73 insertions(+), 55 deletions(-)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 55c7858..0c4ed47 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -156,11 +156,12 @@ static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
struct xen_pci_frontend_ops *xen_pci_frontend;
EXPORT_SYMBOL_GPL(xen_pci_frontend);
-static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+static int xen_setup_msi_irqs(struct device *dev, int nvec, int type)
{
int irq, ret, i;
struct msi_desc *msidesc;
int *v;
+ struct pci_dev *pdev = to_pci_dev(dev);
if (type == PCI_CAP_ID_MSI && nvec > 1)
return 1;
@@ -170,14 +171,14 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
return -ENOMEM;
if (type == PCI_CAP_ID_MSIX)
- ret = xen_pci_frontend_enable_msix(dev, v, nvec);
+ ret = xen_pci_frontend_enable_msix(pdev, v, nvec);
else
- ret = xen_pci_frontend_enable_msi(dev, v);
+ ret = xen_pci_frontend_enable_msi(pdev, v);
if (ret)
goto error;
i = 0;
- list_for_each_entry(msidesc, &dev->msi_list, list) {
- irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
+ list_for_each_entry(msidesc, &pdev->msi_list, list) {
+ irq = xen_bind_pirq_msi_to_irq(pdev, msidesc, v[i],
(type == PCI_CAP_ID_MSI) ? nvec : 1,
(type == PCI_CAP_ID_MSIX) ?
"pcifront-msi-x" :
@@ -193,7 +194,7 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
return 0;
error:
- dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
+ dev_err(dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
free:
kfree(v);
return ret;
@@ -218,47 +219,48 @@ static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
msg->data = XEN_PIRQ_MSI_DATA;
}
-static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+static int xen_hvm_setup_msi_irqs(struct device *dev, int nvec, int type)
{
int irq, pirq;
struct msi_desc *msidesc;
struct msi_msg msg;
+ struct pci_dev *pdev = to_pci_dev(dev);
if (type == PCI_CAP_ID_MSI && nvec > 1)
return 1;
- list_for_each_entry(msidesc, &dev->msi_list, list) {
+ list_for_each_entry(msidesc, &pdev->msi_list, list) {
__read_msi_msg(msidesc, &msg);
pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
if (msg.data != XEN_PIRQ_MSI_DATA ||
xen_irq_from_pirq(pirq) < 0) {
- pirq = xen_allocate_pirq_msi(dev, msidesc);
+ pirq = xen_allocate_pirq_msi(pdev, msidesc);
if (pirq < 0) {
irq = -ENODEV;
goto error;
}
- xen_msi_compose_msg(dev, pirq, &msg);
+ xen_msi_compose_msg(pdev, pirq, &msg);
__write_msi_msg(msidesc, &msg);
- dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
+ dev_dbg(dev, "xen: msi bound to pirq=%d\n", pirq);
} else {
- dev_dbg(&dev->dev,
+ dev_dbg(dev,
"xen: msi already bound to pirq=%d\n", pirq);
}
- irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
+ irq = xen_bind_pirq_msi_to_irq(pdev, msidesc, pirq,
(type == PCI_CAP_ID_MSI) ? nvec : 1,
(type == PCI_CAP_ID_MSIX) ?
"msi-x" : "msi",
DOMID_SELF);
if (irq < 0)
goto error;
- dev_dbg(&dev->dev,
+ dev_dbg(dev,
"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
}
return 0;
error:
- dev_err(&dev->dev,
+ dev_err(dev,
"Xen PCI frontend has not registered MSI/MSI-X support!\n");
return irq;
}
@@ -266,16 +268,17 @@ error:
#ifdef CONFIG_XEN_DOM0
static bool __read_mostly pci_seg_supported = true;
-static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+static int xen_initdom_setup_msi_irqs(struct device *dev, int nvec, int type)
{
int ret = 0;
struct msi_desc *msidesc;
+ struct pci_dev *pdev = to_pci_dev(dev);
- list_for_each_entry(msidesc, &dev->msi_list, list) {
+ list_for_each_entry(msidesc, &pdev->msi_list, list) {
struct physdev_map_pirq map_irq;
domid_t domid;
- domid = ret = xen_find_device_domain_owner(dev);
+ domid = ret = xen_find_device_domain_owner(pdev);
/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
* hence check ret value for < 0. */
if (ret < 0)
@@ -286,9 +289,9 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
map_irq.index = -1;
map_irq.pirq = -1;
- map_irq.bus = dev->bus->number |
- (pci_domain_nr(dev->bus) << 16);
- map_irq.devfn = dev->devfn;
+ map_irq.bus = pdev->bus->number |
+ (pci_domain_nr(pdev->bus) << 16);
+ map_irq.devfn = pdev->devfn;
if (type == PCI_CAP_ID_MSI && nvec > 1) {
map_irq.type = MAP_PIRQ_TYPE_MULTI_MSI;
@@ -297,12 +300,12 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
int pos;
u32 table_offset, bir;
- pos = dev->msix_cap;
- pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
+ pos = pdev->msix_cap;
+ pci_read_config_dword(pdev, pos + PCI_MSIX_TABLE,
&table_offset);
bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
- map_irq.table_base = pci_resource_start(dev, bir);
+ map_irq.table_base = pci_resource_start(pdev, bir);
map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
}
@@ -320,23 +323,23 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
ret = 1;
goto out;
}
- if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
+ if (ret == -EINVAL && !pci_domain_nr(pdev->bus)) {
map_irq.type = MAP_PIRQ_TYPE_MSI;
map_irq.index = -1;
map_irq.pirq = -1;
- map_irq.bus = dev->bus->number;
+ map_irq.bus = pdev->bus->number;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
&map_irq);
if (ret != -EINVAL)
pci_seg_supported = false;
}
if (ret) {
- dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
+ dev_warn(dev, "xen map irq failed %d for %d domain\n",
ret, domid);
goto out;
}
- ret = xen_bind_pirq_msi_to_irq(dev, msidesc, map_irq.pirq,
+ ret = xen_bind_pirq_msi_to_irq(pdev, msidesc, map_irq.pirq,
(type == PCI_CAP_ID_MSI) ? nvec : 1,
(type == PCI_CAP_ID_MSIX) ? "msi-x" : "msi",
domid);
@@ -348,16 +351,17 @@ out:
return ret;
}
-static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
+static void xen_initdom_restore_msi_irqs(struct device *dev)
{
int ret = 0;
+ struct pci_dev *pdev = to_pci_dev(dev);
if (pci_seg_supported) {
struct physdev_pci_device restore_ext;
- restore_ext.seg = pci_domain_nr(dev->bus);
- restore_ext.bus = dev->bus->number;
- restore_ext.devfn = dev->devfn;
+ restore_ext.seg = pci_domain_nr(pdev->bus);
+ restore_ext.bus = pdev->bus->number;
+ restore_ext.devfn = pdev->devfn;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
&restore_ext);
if (ret == -ENOSYS)
@@ -367,33 +371,45 @@ static void xen_initdom_restore_msi_irqs(struct pci_dev *dev)
if (!pci_seg_supported) {
struct physdev_restore_msi restore;
- restore.bus = dev->bus->number;
- restore.devfn = dev->devfn;
+ restore.bus = pdev->bus->number;
+ restore.devfn = pdev->devfn;
ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
}
}
#endif
-static void xen_teardown_msi_irqs(struct pci_dev *dev)
+static void xen_teardown_msi_irq(unsigned int irq)
{
- struct msi_desc *msidesc;
-
- msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
- if (msidesc->msi_attrib.is_msix)
- xen_pci_frontend_disable_msix(dev);
- else
- xen_pci_frontend_disable_msi(dev);
-
- /* Free the IRQ's and the msidesc using the generic code. */
- default_teardown_msi_irqs(dev);
+ xen_destroy_irq(irq);
}
-static void xen_teardown_msi_irq(unsigned int irq)
+static void xen_teardown_msi_irqs(struct device *dev)
{
- xen_destroy_irq(irq);
+ struct msi_desc *entry;
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ entry = list_entry(pdev->msi_list.next, struct msi_desc, list);
+ if (entry->msi_attrib.is_msix)
+ xen_pci_frontend_disable_msix(pdev);
+ else
+ xen_pci_frontend_disable_msi(pdev);
+
+ list_for_each_entry(entry, &pdev->msi_list, list) {
+ int i, nvec;
+ if (entry->irq == 0)
+ continue;
+ if (entry->nvec_used)
+ nvec = entry->nvec_used;
+ else
+ nvec = 1 << entry->msi_attrib.multiple;
+ for (i = 0; i < nvec; i++)
+ xen_teardown_msi_irq(entry->irq + i);
+ }
}
+struct msi_chip xen_msi_chip;
+
#endif
int __init pci_xen_init(void)
@@ -414,9 +430,9 @@ int __init pci_xen_init(void)
#endif
#ifdef CONFIG_PCI_MSI
- x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
- x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
- x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
+ xen_msi_chip.setup_irqs = xen_setup_msi_irqs;
+ xen_msi_chip.teardown_irqs = xen_teardown_msi_irqs;
+ x86_msi_chip = &xen_msi_chip;
#endif
return 0;
}
@@ -435,8 +451,9 @@ int __init pci_xen_hvm_init(void)
#endif
#ifdef CONFIG_PCI_MSI
- x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
- x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+ xen_msi_chip.setup_irqs = xen_hvm_setup_msi_irqs;
+ xen_msi_chip.teardown_irq = xen_teardown_msi_irq;
+ x86_msi_chip = &xen_msi_chip;
#endif
return 0;
}
@@ -493,9 +510,10 @@ int __init pci_xen_initial_domain(void)
int irq;
#ifdef CONFIG_PCI_MSI
- x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
- x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
- x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
+ xen_msi_chip.setup_irqs = xen_initdom_setup_msi_irqs;
+ xen_msi_chip.teardown_irq = xen_teardown_msi_irq;
+ xen_msi_chip.restore_irqs = xen_initdom_restore_msi_irqs;
+ x86_msi_chip = &xen_msi_chip;
#endif
xen_setup_acpi_sci();
__acpi_register_gsi = acpi_register_gsi_xen;
--
1.7.1
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