mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 12:14:01 +08:00
b5401a96b5
The frontend stub lives in arch/x86/pci/xen.c, alongside other sub-arch PCI init code (e.g. olpc.c). It provides a mechanism for Xen PCI frontend to setup/destroy legacy interrupts, MSI/MSI-X, and PCI configuration operations. [ Impact: add core of Xen PCI support ] [ v2: Removed the IOMMU code and only focusing on PCI.] [ v3: removed usage of pci_scan_all_fns as that does not exist] [ v4: introduced pci_xen value to fix compile warnings] [ v5: squished fixes+features in one patch, changed Reviewed-by to Ccs] [ v7: added Acked-by] Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Qing He <qing.he@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86@kernel.org
148 lines
3.0 KiB
C
148 lines
3.0 KiB
C
/*
|
|
* Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
|
|
* x86 PCI core to support the Xen PCI Frontend
|
|
*
|
|
* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/acpi.h>
|
|
|
|
#include <linux/io.h>
|
|
#include <asm/pci_x86.h>
|
|
|
|
#include <asm/xen/hypervisor.h>
|
|
|
|
#include <xen/events.h>
|
|
#include <asm/xen/pci.h>
|
|
|
|
#if defined(CONFIG_PCI_MSI)
|
|
#include <linux/msi.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 (!xen_initial_domain()) {
|
|
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_allocate_pirq(v[i], 0, /* not sharable */
|
|
(type == PCI_CAP_ID_MSIX) ?
|
|
"pcifront-msi-x" : "pcifront-msi");
|
|
if (irq < 0)
|
|
return -1;
|
|
|
|
ret = set_irq_msi(irq, msidesc);
|
|
if (ret)
|
|
goto error_while;
|
|
i++;
|
|
}
|
|
kfree(v);
|
|
return 0;
|
|
|
|
error_while:
|
|
unbind_from_irqhandler(irq, NULL);
|
|
error:
|
|
if (ret == -ENODEV)
|
|
dev_err(&dev->dev, "Xen PCI frontend has not registered" \
|
|
" MSI/MSI-X support!\n");
|
|
|
|
kfree(v);
|
|
return ret;
|
|
}
|
|
|
|
static void xen_teardown_msi_irqs(struct pci_dev *dev)
|
|
{
|
|
/* Only do this when were are in non-privileged mode.*/
|
|
if (!xen_initial_domain()) {
|
|
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);
|
|
}
|
|
|
|
}
|
|
|
|
static void xen_teardown_msi_irq(unsigned int irq)
|
|
{
|
|
xen_destroy_irq(irq);
|
|
}
|
|
#endif
|
|
|
|
static int xen_pcifront_enable_irq(struct pci_dev *dev)
|
|
{
|
|
int rc;
|
|
int share = 1;
|
|
|
|
dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
|
|
|
|
if (dev->irq < 0)
|
|
return -EINVAL;
|
|
|
|
if (dev->irq < NR_IRQS_LEGACY)
|
|
share = 0;
|
|
|
|
rc = xen_allocate_pirq(dev->irq, share, "pcifront");
|
|
if (rc < 0) {
|
|
dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
|
|
dev->irq, rc);
|
|
return rc;
|
|
}
|
|
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_ISAPNP
|
|
/* Stop isapnp from probing */
|
|
isapnp_disable = 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;
|
|
}
|