mirror of https://gitee.com/openkylin/linux.git
387 lines
8.6 KiB
C
387 lines
8.6 KiB
C
/*
|
|
* PCI Backend - Handles the virtual fields in the configuration space headers.
|
|
*
|
|
* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include "pciback.h"
|
|
#include "conf_space.h"
|
|
|
|
struct pci_bar_info {
|
|
u32 val;
|
|
u32 len_val;
|
|
int which;
|
|
};
|
|
|
|
#define DRV_NAME "xen-pciback"
|
|
#define is_enable_cmd(value) ((value)&(PCI_COMMAND_MEMORY|PCI_COMMAND_IO))
|
|
#define is_master_cmd(value) ((value)&PCI_COMMAND_MASTER)
|
|
|
|
static int command_read(struct pci_dev *dev, int offset, u16 *value, void *data)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
ret = xen_pcibk_read_config_word(dev, offset, value, data);
|
|
if (!atomic_read(&dev->enable_cnt))
|
|
return ret;
|
|
|
|
for (i = 0; i < PCI_ROM_RESOURCE; i++) {
|
|
if (dev->resource[i].flags & IORESOURCE_IO)
|
|
*value |= PCI_COMMAND_IO;
|
|
if (dev->resource[i].flags & IORESOURCE_MEM)
|
|
*value |= PCI_COMMAND_MEMORY;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
|
|
{
|
|
struct xen_pcibk_dev_data *dev_data;
|
|
int err;
|
|
|
|
dev_data = pci_get_drvdata(dev);
|
|
if (!pci_is_enabled(dev) && is_enable_cmd(value)) {
|
|
if (unlikely(verbose_request))
|
|
printk(KERN_DEBUG DRV_NAME ": %s: enable\n",
|
|
pci_name(dev));
|
|
err = pci_enable_device(dev);
|
|
if (err)
|
|
return err;
|
|
if (dev_data)
|
|
dev_data->enable_intx = 1;
|
|
} else if (pci_is_enabled(dev) && !is_enable_cmd(value)) {
|
|
if (unlikely(verbose_request))
|
|
printk(KERN_DEBUG DRV_NAME ": %s: disable\n",
|
|
pci_name(dev));
|
|
pci_disable_device(dev);
|
|
if (dev_data)
|
|
dev_data->enable_intx = 0;
|
|
}
|
|
|
|
if (!dev->is_busmaster && is_master_cmd(value)) {
|
|
if (unlikely(verbose_request))
|
|
printk(KERN_DEBUG DRV_NAME ": %s: set bus master\n",
|
|
pci_name(dev));
|
|
pci_set_master(dev);
|
|
}
|
|
|
|
if (value & PCI_COMMAND_INVALIDATE) {
|
|
if (unlikely(verbose_request))
|
|
printk(KERN_DEBUG
|
|
DRV_NAME ": %s: enable memory-write-invalidate\n",
|
|
pci_name(dev));
|
|
err = pci_set_mwi(dev);
|
|
if (err) {
|
|
printk(KERN_WARNING
|
|
DRV_NAME ": %s: cannot enable "
|
|
"memory-write-invalidate (%d)\n",
|
|
pci_name(dev), err);
|
|
value &= ~PCI_COMMAND_INVALIDATE;
|
|
}
|
|
}
|
|
|
|
return pci_write_config_word(dev, offset, value);
|
|
}
|
|
|
|
static int rom_write(struct pci_dev *dev, int offset, u32 value, void *data)
|
|
{
|
|
struct pci_bar_info *bar = data;
|
|
|
|
if (unlikely(!bar)) {
|
|
printk(KERN_WARNING DRV_NAME ": driver data not found for %s\n",
|
|
pci_name(dev));
|
|
return XEN_PCI_ERR_op_failed;
|
|
}
|
|
|
|
/* A write to obtain the length must happen as a 32-bit write.
|
|
* This does not (yet) support writing individual bytes
|
|
*/
|
|
if (value == ~PCI_ROM_ADDRESS_ENABLE)
|
|
bar->which = 1;
|
|
else {
|
|
u32 tmpval;
|
|
pci_read_config_dword(dev, offset, &tmpval);
|
|
if (tmpval != bar->val && value == bar->val) {
|
|
/* Allow restoration of bar value. */
|
|
pci_write_config_dword(dev, offset, bar->val);
|
|
}
|
|
bar->which = 0;
|
|
}
|
|
|
|
/* Do we need to support enabling/disabling the rom address here? */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* For the BARs, only allow writes which write ~0 or
|
|
* the correct resource information
|
|
* (Needed for when the driver probes the resource usage)
|
|
*/
|
|
static int bar_write(struct pci_dev *dev, int offset, u32 value, void *data)
|
|
{
|
|
struct pci_bar_info *bar = data;
|
|
|
|
if (unlikely(!bar)) {
|
|
printk(KERN_WARNING DRV_NAME ": driver data not found for %s\n",
|
|
pci_name(dev));
|
|
return XEN_PCI_ERR_op_failed;
|
|
}
|
|
|
|
/* A write to obtain the length must happen as a 32-bit write.
|
|
* This does not (yet) support writing individual bytes
|
|
*/
|
|
if (value == ~0)
|
|
bar->which = 1;
|
|
else {
|
|
u32 tmpval;
|
|
pci_read_config_dword(dev, offset, &tmpval);
|
|
if (tmpval != bar->val && value == bar->val) {
|
|
/* Allow restoration of bar value. */
|
|
pci_write_config_dword(dev, offset, bar->val);
|
|
}
|
|
bar->which = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bar_read(struct pci_dev *dev, int offset, u32 * value, void *data)
|
|
{
|
|
struct pci_bar_info *bar = data;
|
|
|
|
if (unlikely(!bar)) {
|
|
printk(KERN_WARNING DRV_NAME ": driver data not found for %s\n",
|
|
pci_name(dev));
|
|
return XEN_PCI_ERR_op_failed;
|
|
}
|
|
|
|
*value = bar->which ? bar->len_val : bar->val;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void read_dev_bar(struct pci_dev *dev,
|
|
struct pci_bar_info *bar_info, int offset,
|
|
u32 len_mask)
|
|
{
|
|
int pos;
|
|
struct resource *res = dev->resource;
|
|
|
|
if (offset == PCI_ROM_ADDRESS || offset == PCI_ROM_ADDRESS1)
|
|
pos = PCI_ROM_RESOURCE;
|
|
else {
|
|
pos = (offset - PCI_BASE_ADDRESS_0) / 4;
|
|
if (pos && ((res[pos - 1].flags & (PCI_BASE_ADDRESS_SPACE |
|
|
PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
|
|
(PCI_BASE_ADDRESS_SPACE_MEMORY |
|
|
PCI_BASE_ADDRESS_MEM_TYPE_64))) {
|
|
bar_info->val = res[pos - 1].start >> 32;
|
|
bar_info->len_val = res[pos - 1].end >> 32;
|
|
return;
|
|
}
|
|
}
|
|
|
|
bar_info->val = res[pos].start |
|
|
(res[pos].flags & PCI_REGION_FLAG_MASK);
|
|
bar_info->len_val = res[pos].end - res[pos].start + 1;
|
|
}
|
|
|
|
static void *bar_init(struct pci_dev *dev, int offset)
|
|
{
|
|
struct pci_bar_info *bar = kmalloc(sizeof(*bar), GFP_KERNEL);
|
|
|
|
if (!bar)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
read_dev_bar(dev, bar, offset, ~0);
|
|
bar->which = 0;
|
|
|
|
return bar;
|
|
}
|
|
|
|
static void *rom_init(struct pci_dev *dev, int offset)
|
|
{
|
|
struct pci_bar_info *bar = kmalloc(sizeof(*bar), GFP_KERNEL);
|
|
|
|
if (!bar)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
read_dev_bar(dev, bar, offset, ~PCI_ROM_ADDRESS_ENABLE);
|
|
bar->which = 0;
|
|
|
|
return bar;
|
|
}
|
|
|
|
static void bar_reset(struct pci_dev *dev, int offset, void *data)
|
|
{
|
|
struct pci_bar_info *bar = data;
|
|
|
|
bar->which = 0;
|
|
}
|
|
|
|
static void bar_release(struct pci_dev *dev, int offset, void *data)
|
|
{
|
|
kfree(data);
|
|
}
|
|
|
|
static int xen_pcibk_read_vendor(struct pci_dev *dev, int offset,
|
|
u16 *value, void *data)
|
|
{
|
|
*value = dev->vendor;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xen_pcibk_read_device(struct pci_dev *dev, int offset,
|
|
u16 *value, void *data)
|
|
{
|
|
*value = dev->device;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int interrupt_read(struct pci_dev *dev, int offset, u8 * value,
|
|
void *data)
|
|
{
|
|
*value = (u8) dev->irq;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bist_write(struct pci_dev *dev, int offset, u8 value, void *data)
|
|
{
|
|
u8 cur_value;
|
|
int err;
|
|
|
|
err = pci_read_config_byte(dev, offset, &cur_value);
|
|
if (err)
|
|
goto out;
|
|
|
|
if ((cur_value & ~PCI_BIST_START) == (value & ~PCI_BIST_START)
|
|
|| value == PCI_BIST_START)
|
|
err = pci_write_config_byte(dev, offset, value);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static const struct config_field header_common[] = {
|
|
{
|
|
.offset = PCI_VENDOR_ID,
|
|
.size = 2,
|
|
.u.w.read = xen_pcibk_read_vendor,
|
|
},
|
|
{
|
|
.offset = PCI_DEVICE_ID,
|
|
.size = 2,
|
|
.u.w.read = xen_pcibk_read_device,
|
|
},
|
|
{
|
|
.offset = PCI_COMMAND,
|
|
.size = 2,
|
|
.u.w.read = command_read,
|
|
.u.w.write = command_write,
|
|
},
|
|
{
|
|
.offset = PCI_INTERRUPT_LINE,
|
|
.size = 1,
|
|
.u.b.read = interrupt_read,
|
|
},
|
|
{
|
|
.offset = PCI_INTERRUPT_PIN,
|
|
.size = 1,
|
|
.u.b.read = xen_pcibk_read_config_byte,
|
|
},
|
|
{
|
|
/* Any side effects of letting driver domain control cache line? */
|
|
.offset = PCI_CACHE_LINE_SIZE,
|
|
.size = 1,
|
|
.u.b.read = xen_pcibk_read_config_byte,
|
|
.u.b.write = xen_pcibk_write_config_byte,
|
|
},
|
|
{
|
|
.offset = PCI_LATENCY_TIMER,
|
|
.size = 1,
|
|
.u.b.read = xen_pcibk_read_config_byte,
|
|
},
|
|
{
|
|
.offset = PCI_BIST,
|
|
.size = 1,
|
|
.u.b.read = xen_pcibk_read_config_byte,
|
|
.u.b.write = bist_write,
|
|
},
|
|
{}
|
|
};
|
|
|
|
#define CFG_FIELD_BAR(reg_offset) \
|
|
{ \
|
|
.offset = reg_offset, \
|
|
.size = 4, \
|
|
.init = bar_init, \
|
|
.reset = bar_reset, \
|
|
.release = bar_release, \
|
|
.u.dw.read = bar_read, \
|
|
.u.dw.write = bar_write, \
|
|
}
|
|
|
|
#define CFG_FIELD_ROM(reg_offset) \
|
|
{ \
|
|
.offset = reg_offset, \
|
|
.size = 4, \
|
|
.init = rom_init, \
|
|
.reset = bar_reset, \
|
|
.release = bar_release, \
|
|
.u.dw.read = bar_read, \
|
|
.u.dw.write = rom_write, \
|
|
}
|
|
|
|
static const struct config_field header_0[] = {
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_0),
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_1),
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_2),
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_3),
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_4),
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_5),
|
|
CFG_FIELD_ROM(PCI_ROM_ADDRESS),
|
|
{}
|
|
};
|
|
|
|
static const struct config_field header_1[] = {
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_0),
|
|
CFG_FIELD_BAR(PCI_BASE_ADDRESS_1),
|
|
CFG_FIELD_ROM(PCI_ROM_ADDRESS1),
|
|
{}
|
|
};
|
|
|
|
int xen_pcibk_config_header_add_fields(struct pci_dev *dev)
|
|
{
|
|
int err;
|
|
|
|
err = xen_pcibk_config_add_fields(dev, header_common);
|
|
if (err)
|
|
goto out;
|
|
|
|
switch (dev->hdr_type) {
|
|
case PCI_HEADER_TYPE_NORMAL:
|
|
err = xen_pcibk_config_add_fields(dev, header_0);
|
|
break;
|
|
|
|
case PCI_HEADER_TYPE_BRIDGE:
|
|
err = xen_pcibk_config_add_fields(dev, header_1);
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
printk(KERN_ERR DRV_NAME ": %s: Unsupported header type %d!\n",
|
|
pci_name(dev), dev->hdr_type);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
return err;
|
|
}
|