30edc14bf3
This is the host side counterpart to the frontend driver in drivers/pci/xen-pcifront.c. The PV protocol is also implemented by frontend drivers in other OSes too, such as the BSDs. The PV protocol is rather simple. There is page shared with the guest, which has the 'struct xen_pci_sharedinfo' embossed in it. The backend has a thread that is kicked every-time the structure is changed and based on the operation field it performs specific tasks: XEN_PCI_OP_conf_[read|write]: Read/Write 0xCF8/0xCFC filtered data. (conf_space*.c) Based on which field is probed, we either enable/disable the PCI device, change power state, read VPD, etc. The major goal of this call is to provide a Physical IRQ (PIRQ) to the guest. The PIRQ is Xen hypervisor global IRQ value irrespective of the IRQ is tied in to the IO-APIC, or is a vector. For GSI type interrupts, the PIRQ==GSI holds. For MSI/MSI-X the PIRQ value != Linux IRQ number (thought PIRQ==vector). Please note, that with Xen, all interrupts (except those level shared ones) are injected directly to the guest - there is no host interaction. XEN_PCI_OP_[enable|disable]_msi[|x] (pciback_ops.c) Enables/disables the MSI/MSI-X capability of the device. These operations setup the MSI/MSI-X vectors for the guest and pass them to the frontend. When the device is activated, the interrupts are directly injected in the guest without involving the host. XEN_PCI_OP_aer_[detected|resume|mmio|slotreset]: In case of failure, perform the appropriate AER commands on the guest. Right now that is a cop-out - we just kill the guest. Besides implementing those commands, it can also - hide a PCI device from the host. When booting up, the user can specify xen-pciback.hide=(1:0:0)(BDF..) so that host does not try to use the device. The driver was lifted from linux-2.6.18.hg tree and fixed up so that it could compile under v3.0. Per suggestion from Jesse Barnes moved the driver to drivers/xen/xen-pciback. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
127 lines
3.7 KiB
C
127 lines
3.7 KiB
C
/*
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* PCI Backend - Common data structures for overriding the configuration space
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*
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* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
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*/
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#ifndef __XEN_PCIBACK_CONF_SPACE_H__
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#define __XEN_PCIBACK_CONF_SPACE_H__
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#include <linux/list.h>
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#include <linux/err.h>
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/* conf_field_init can return an errno in a ptr with ERR_PTR() */
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typedef void *(*conf_field_init) (struct pci_dev *dev, int offset);
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typedef void (*conf_field_reset) (struct pci_dev *dev, int offset, void *data);
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typedef void (*conf_field_free) (struct pci_dev *dev, int offset, void *data);
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typedef int (*conf_dword_write) (struct pci_dev *dev, int offset, u32 value,
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void *data);
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typedef int (*conf_word_write) (struct pci_dev *dev, int offset, u16 value,
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void *data);
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typedef int (*conf_byte_write) (struct pci_dev *dev, int offset, u8 value,
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void *data);
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typedef int (*conf_dword_read) (struct pci_dev *dev, int offset, u32 *value,
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void *data);
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typedef int (*conf_word_read) (struct pci_dev *dev, int offset, u16 *value,
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void *data);
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typedef int (*conf_byte_read) (struct pci_dev *dev, int offset, u8 *value,
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void *data);
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/* These are the fields within the configuration space which we
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* are interested in intercepting reads/writes to and changing their
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* values.
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*/
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struct config_field {
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unsigned int offset;
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unsigned int size;
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unsigned int mask;
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conf_field_init init;
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conf_field_reset reset;
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conf_field_free release;
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void (*clean) (struct config_field *field);
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union {
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struct {
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conf_dword_write write;
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conf_dword_read read;
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} dw;
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struct {
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conf_word_write write;
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conf_word_read read;
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} w;
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struct {
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conf_byte_write write;
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conf_byte_read read;
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} b;
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} u;
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struct list_head list;
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};
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struct config_field_entry {
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struct list_head list;
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const struct config_field *field;
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unsigned int base_offset;
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void *data;
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};
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#define OFFSET(cfg_entry) ((cfg_entry)->base_offset+(cfg_entry)->field->offset)
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/* Add fields to a device - the add_fields macro expects to get a pointer to
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* the first entry in an array (of which the ending is marked by size==0)
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*/
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int pciback_config_add_field_offset(struct pci_dev *dev,
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const struct config_field *field,
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unsigned int offset);
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static inline int pciback_config_add_field(struct pci_dev *dev,
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const struct config_field *field)
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{
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return pciback_config_add_field_offset(dev, field, 0);
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}
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static inline int pciback_config_add_fields(struct pci_dev *dev,
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const struct config_field *field)
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{
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int i, err = 0;
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for (i = 0; field[i].size != 0; i++) {
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err = pciback_config_add_field(dev, &field[i]);
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if (err)
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break;
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}
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return err;
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}
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static inline int pciback_config_add_fields_offset(struct pci_dev *dev,
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const struct config_field *field,
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unsigned int offset)
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{
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int i, err = 0;
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for (i = 0; field[i].size != 0; i++) {
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err = pciback_config_add_field_offset(dev, &field[i], offset);
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if (err)
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break;
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}
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return err;
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}
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/* Read/Write the real configuration space */
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int pciback_read_config_byte(struct pci_dev *dev, int offset, u8 *value,
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void *data);
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int pciback_read_config_word(struct pci_dev *dev, int offset, u16 *value,
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void *data);
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int pciback_read_config_dword(struct pci_dev *dev, int offset, u32 *value,
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void *data);
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int pciback_write_config_byte(struct pci_dev *dev, int offset, u8 value,
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void *data);
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int pciback_write_config_word(struct pci_dev *dev, int offset, u16 value,
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void *data);
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int pciback_write_config_dword(struct pci_dev *dev, int offset, u32 value,
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void *data);
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int pciback_config_capability_init(void);
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int pciback_config_header_add_fields(struct pci_dev *dev);
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int pciback_config_capability_add_fields(struct pci_dev *dev);
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#endif /* __XEN_PCIBACK_CONF_SPACE_H__ */
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