The file is hard to read. Move the code around so that
the contents of it follows a uniform format:
 - setup GSIs - PV, HVM, and initial domain case
 - then MSI/MSI-x setup - PV, HVM and then initial domain case.
 - then MSI/MSI-x teardown - same order.
 - lastly, the __init functions in PV, HVM, and initial domain order.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2011-07-06 10:16:21 -04:00
Родитель 075d9db131
Коммит fef6e26208
1 изменённых файлов: 276 добавлений и 276 удалений

Просмотреть файл

@ -19,6 +19,43 @@
#include <xen/events.h> #include <xen/events.h>
#include <asm/xen/pci.h> #include <asm/xen/pci.h>
static int xen_pcifront_enable_irq(struct pci_dev *dev)
{
int rc;
int share = 1;
int pirq;
u8 gsi;
rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
rc);
return rc;
}
rc = xen_allocate_pirq_gsi(gsi);
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
gsi, rc);
return rc;
}
pirq = rc;
if (gsi < NR_IRQS_LEGACY)
share = 0;
rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
gsi, pirq, rc);
return rc;
}
dev->irq = rc;
dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
return 0;
}
#ifdef CONFIG_ACPI #ifdef CONFIG_ACPI
static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi, static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
int trigger, int polarity) int trigger, int polarity)
@ -58,274 +95,6 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
} }
#endif #endif
#if defined(CONFIG_PCI_MSI)
#include <linux/msi.h>
#include <asm/msidef.h>
struct xen_pci_frontend_ops *xen_pci_frontend;
EXPORT_SYMBOL_GPL(xen_pci_frontend);
#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
struct msi_msg *msg)
{
/* We set vector == 0 to tell the hypervisor we don't care about it,
* but we want a pirq setup instead.
* We use the dest_id field to pass the pirq that we want. */
msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
msg->address_lo =
MSI_ADDR_BASE_LO |
MSI_ADDR_DEST_MODE_PHYSICAL |
MSI_ADDR_REDIRECTION_CPU |
MSI_ADDR_DEST_ID(pirq);
msg->data = XEN_PIRQ_MSI_DATA;
}
static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int irq, pirq;
struct msi_desc *msidesc;
struct msi_msg msg;
list_for_each_entry(msidesc, &dev->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);
if (pirq < 0)
goto error;
xen_msi_compose_msg(dev, pirq, &msg);
__write_msi_msg(msidesc, &msg);
dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
} else {
dev_dbg(&dev->dev,
"xen: msi already bound to pirq=%d\n", pirq);
}
irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
(type == PCI_CAP_ID_MSIX) ?
"msi-x" : "msi",
DOMID_SELF);
if (irq < 0)
goto error;
dev_dbg(&dev->dev,
"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
}
return 0;
error:
dev_err(&dev->dev,
"Xen PCI frontend has not registered MSI/MSI-X support!\n");
return -ENODEV;
}
/*
* For MSI interrupts we have to use drivers/xen/event.s functions to
* allocate an irq_desc and setup the right */
static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int irq, ret, i;
struct msi_desc *msidesc;
int *v;
v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
if (!v)
return -ENOMEM;
if (type == PCI_CAP_ID_MSIX)
ret = xen_pci_frontend_enable_msix(dev, v, nvec);
else
ret = xen_pci_frontend_enable_msi(dev, 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], 0,
(type == PCI_CAP_ID_MSIX) ?
"pcifront-msi-x" :
"pcifront-msi",
DOMID_SELF);
if (irq < 0)
goto free;
i++;
}
kfree(v);
return 0;
error:
dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
free:
kfree(v);
return ret;
}
static void xen_teardown_msi_irqs(struct pci_dev *dev)
{
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);
}
static void xen_teardown_msi_irq(unsigned int irq)
{
xen_destroy_irq(irq);
}
#ifdef CONFIG_XEN_DOM0
static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int ret = 0;
struct msi_desc *msidesc;
list_for_each_entry(msidesc, &dev->msi_list, list) {
struct physdev_map_pirq map_irq;
domid_t domid;
domid = ret = xen_find_device_domain_owner(dev);
/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
* hence check ret value for < 0. */
if (ret < 0)
domid = DOMID_SELF;
memset(&map_irq, 0, sizeof(map_irq));
map_irq.domid = domid;
map_irq.type = MAP_PIRQ_TYPE_MSI;
map_irq.index = -1;
map_irq.pirq = -1;
map_irq.bus = dev->bus->number;
map_irq.devfn = dev->devfn;
if (type == PCI_CAP_ID_MSIX) {
int pos;
u32 table_offset, bir;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
&table_offset);
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
map_irq.table_base = pci_resource_start(dev, bir);
map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
}
ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
if (ret) {
dev_warn(&dev->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, map_irq.index,
(type == PCI_CAP_ID_MSIX) ?
"msi-x" : "msi",
domid);
if (ret < 0)
goto out;
}
ret = 0;
out:
return ret;
}
#endif
#endif
static int xen_pcifront_enable_irq(struct pci_dev *dev)
{
int rc;
int share = 1;
int pirq;
u8 gsi;
rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
rc);
return rc;
}
rc = xen_allocate_pirq_gsi(gsi);
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
gsi, rc);
return rc;
}
pirq = rc;
if (gsi < NR_IRQS_LEGACY)
share = 0;
rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
if (rc < 0) {
dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
gsi, pirq, rc);
return rc;
}
dev->irq = rc;
dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
return 0;
}
int __init pci_xen_init(void)
{
if (!xen_pv_domain() || xen_initial_domain())
return -ENODEV;
printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
pcibios_set_cache_line_size();
pcibios_enable_irq = xen_pcifront_enable_irq;
pcibios_disable_irq = NULL;
#ifdef CONFIG_ACPI
/* Keep ACPI out of the picture */
acpi_noirq = 1;
#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;
#endif
return 0;
}
int __init pci_xen_hvm_init(void)
{
if (!xen_feature(XENFEAT_hvm_pirqs))
return 0;
#ifdef CONFIG_ACPI
/*
* We don't want to change the actual ACPI delivery model,
* just how GSIs get registered.
*/
__acpi_register_gsi = acpi_register_gsi_xen_hvm;
#endif
#ifdef CONFIG_PCI_MSI
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
#endif
return 0;
}
#ifdef CONFIG_XEN_DOM0 #ifdef CONFIG_XEN_DOM0
static int xen_register_pirq(u32 gsi, int gsi_override, int triggering) static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
{ {
@ -400,6 +169,245 @@ static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polar
return irq; return irq;
} }
static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
int trigger, int polarity)
{
return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
}
#endif
#if defined(CONFIG_PCI_MSI)
#include <linux/msi.h>
#include <asm/msidef.h>
struct xen_pci_frontend_ops *xen_pci_frontend;
EXPORT_SYMBOL_GPL(xen_pci_frontend);
/*
* For MSI interrupts we have to use drivers/xen/event.s functions to
* allocate an irq_desc and setup the right */
static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int irq, ret, i;
struct msi_desc *msidesc;
int *v;
v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
if (!v)
return -ENOMEM;
if (type == PCI_CAP_ID_MSIX)
ret = xen_pci_frontend_enable_msix(dev, v, nvec);
else
ret = xen_pci_frontend_enable_msi(dev, 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], 0,
(type == PCI_CAP_ID_MSIX) ?
"pcifront-msi-x" :
"pcifront-msi",
DOMID_SELF);
if (irq < 0)
goto free;
i++;
}
kfree(v);
return 0;
error:
dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
free:
kfree(v);
return ret;
}
#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE | \
MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))
static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
struct msi_msg *msg)
{
/* We set vector == 0 to tell the hypervisor we don't care about it,
* but we want a pirq setup instead.
* We use the dest_id field to pass the pirq that we want. */
msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
msg->address_lo =
MSI_ADDR_BASE_LO |
MSI_ADDR_DEST_MODE_PHYSICAL |
MSI_ADDR_REDIRECTION_CPU |
MSI_ADDR_DEST_ID(pirq);
msg->data = XEN_PIRQ_MSI_DATA;
}
static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int irq, pirq;
struct msi_desc *msidesc;
struct msi_msg msg;
list_for_each_entry(msidesc, &dev->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);
if (pirq < 0)
goto error;
xen_msi_compose_msg(dev, pirq, &msg);
__write_msi_msg(msidesc, &msg);
dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
} else {
dev_dbg(&dev->dev,
"xen: msi already bound to pirq=%d\n", pirq);
}
irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
(type == PCI_CAP_ID_MSIX) ?
"msi-x" : "msi",
DOMID_SELF);
if (irq < 0)
goto error;
dev_dbg(&dev->dev,
"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
}
return 0;
error:
dev_err(&dev->dev,
"Xen PCI frontend has not registered MSI/MSI-X support!\n");
return -ENODEV;
}
#ifdef CONFIG_XEN_DOM0
static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
int ret = 0;
struct msi_desc *msidesc;
list_for_each_entry(msidesc, &dev->msi_list, list) {
struct physdev_map_pirq map_irq;
domid_t domid;
domid = ret = xen_find_device_domain_owner(dev);
/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
* hence check ret value for < 0. */
if (ret < 0)
domid = DOMID_SELF;
memset(&map_irq, 0, sizeof(map_irq));
map_irq.domid = domid;
map_irq.type = MAP_PIRQ_TYPE_MSI;
map_irq.index = -1;
map_irq.pirq = -1;
map_irq.bus = dev->bus->number;
map_irq.devfn = dev->devfn;
if (type == PCI_CAP_ID_MSIX) {
int pos;
u32 table_offset, bir;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
&table_offset);
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
map_irq.table_base = pci_resource_start(dev, bir);
map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
}
ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
if (ret) {
dev_warn(&dev->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, map_irq.index,
(type == PCI_CAP_ID_MSIX) ?
"msi-x" : "msi",
domid);
if (ret < 0)
goto out;
}
ret = 0;
out:
return ret;
}
#endif
static void xen_teardown_msi_irqs(struct pci_dev *dev)
{
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);
}
static void xen_teardown_msi_irq(unsigned int irq)
{
xen_destroy_irq(irq);
}
#endif
int __init pci_xen_init(void)
{
if (!xen_pv_domain() || xen_initial_domain())
return -ENODEV;
printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
pcibios_set_cache_line_size();
pcibios_enable_irq = xen_pcifront_enable_irq;
pcibios_disable_irq = NULL;
#ifdef CONFIG_ACPI
/* Keep ACPI out of the picture */
acpi_noirq = 1;
#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;
#endif
return 0;
}
int __init pci_xen_hvm_init(void)
{
if (!xen_feature(XENFEAT_hvm_pirqs))
return 0;
#ifdef CONFIG_ACPI
/*
* We don't want to change the actual ACPI delivery model,
* just how GSIs get registered.
*/
__acpi_register_gsi = acpi_register_gsi_xen_hvm;
#endif
#ifdef CONFIG_PCI_MSI
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
#endif
return 0;
}
#ifdef CONFIG_XEN_DOM0
static __init void xen_setup_acpi_sci(void) static __init void xen_setup_acpi_sci(void)
{ {
int rc; int rc;
@ -447,12 +455,6 @@ static __init void xen_setup_acpi_sci(void)
return; return;
} }
static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
int trigger, int polarity)
{
return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
}
static int __init pci_xen_initial_domain(void) static int __init pci_xen_initial_domain(void)
{ {
#ifdef CONFIG_PCI_MSI #ifdef CONFIG_PCI_MSI
@ -493,9 +495,7 @@ void __init xen_setup_pirqs(void)
trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE); trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
} }
} }
#endif
#ifdef CONFIG_XEN_DOM0
struct xen_device_domain_owner { struct xen_device_domain_owner {
domid_t domain; domid_t domain;
struct pci_dev *dev; struct pci_dev *dev;