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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [linux-2.6.18-xen] Save/restore PCI MSI state across S3.
# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1227536158 0
# Node ID 1b68d09b868fdcd724c6b86eb2790748a9fd0bb7
# Parent 163a3807cb1fb4f35304a99c63f4deac322df2da
Save/restore PCI MSI state across S3.
Signed-off-by: Haitao Shan <haitao.shan@xxxxxxxxx>
---
drivers/pci/msi-xen.c | 177 ++++++++++++++++++++++++++++++++++++--------------
1 files changed, 128 insertions(+), 49 deletions(-)
diff -r 163a3807cb1f -r 1b68d09b868f drivers/pci/msi-xen.c
--- a/drivers/pci/msi-xen.c Mon Nov 24 11:13:20 2008 +0000
+++ b/drivers/pci/msi-xen.c Mon Nov 24 14:15:58 2008 +0000
@@ -48,6 +48,13 @@ struct msi_pirq_entry {
struct list_head list;
int pirq;
int entry_nr;
+#ifdef CONFIG_PM
+ /* PM save area for MSIX address/data */
+ void __iomem *mask_base;
+ u32 address_hi_save;
+ u32 address_lo_save;
+ u32 data_save;
+#endif
};
static struct msi_dev_list *get_msi_dev_pirq_list(struct pci_dev *dev)
@@ -83,7 +90,7 @@ static struct msi_dev_list *get_msi_dev_
return ret;
}
-static int attach_pirq_entry(int pirq, int entry_nr,
+static int attach_pirq_entry(int pirq, int entry_nr, u64 table_base,
struct msi_dev_list *msi_dev_entry)
{
struct msi_pirq_entry *entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
@@ -93,6 +100,9 @@ static int attach_pirq_entry(int pirq, i
return -ENOMEM;
entry->pirq = pirq;
entry->entry_nr = entry_nr;
+#ifdef COMFIG_PM
+ entry->mask_base = table_base;
+#endif
spin_lock_irqsave(&msi_dev_entry->pirq_list_lock, flags);
list_add_tail(&entry->list, &msi_dev_entry->pirq_list_head);
spin_unlock_irqrestore(&msi_dev_entry->pirq_list_lock, flags);
@@ -299,104 +309,173 @@ static void enable_msi_mode(struct pci_d
#ifdef CONFIG_PM
int pci_save_msi_state(struct pci_dev *dev)
{
- int pos;
+ int pos, i = 0;
+ u16 control;
+ struct pci_cap_saved_state *save_state;
+ u32 *cap;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (pos <= 0 || dev->no_msi)
return 0;
- if (!dev->msi_enabled)
+ pci_read_config_word(dev, msi_control_reg(pos), &control);
+ if (!(control & PCI_MSI_FLAGS_ENABLE))
return 0;
- /* Restore dev->irq to its default pin-assertion vector */
- msi_unmap_pirq(dev, dev->irq);
- /* Disable MSI mode */
- disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
- /* Set the flags for use of restore */
- dev->msi_enabled = 1;
+ save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) *
5,
+ GFP_KERNEL);
+ if (!save_state) {
+ printk(KERN_ERR "Out of memory in pci_save_msi_state\n");
+ return -ENOMEM;
+ }
+ cap = &save_state->data[0];
+
+ pci_read_config_dword(dev, pos, &cap[i++]);
+ control = cap[0] >> 16;
+ pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, &cap[i++]);
+ if (control & PCI_MSI_FLAGS_64BIT) {
+ pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, &cap[i++]);
+ pci_read_config_dword(dev, pos + PCI_MSI_DATA_64, &cap[i++]);
+ } else
+ pci_read_config_dword(dev, pos + PCI_MSI_DATA_32, &cap[i++]);
+ if (control & PCI_MSI_FLAGS_MASKBIT)
+ pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT, &cap[i++]);
+ save_state->cap_nr = PCI_CAP_ID_MSI;
+ pci_add_saved_cap(dev, save_state);
return 0;
}
void pci_restore_msi_state(struct pci_dev *dev)
{
- int pos, pirq;
-
+ int i = 0, pos;
+ u16 control;
+ struct pci_cap_saved_state *save_state;
+ u32 *cap;
+
+ save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSI);
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
- if (pos <= 0)
- return;
-
- if (!dev->msi_enabled)
- return;
-
- pirq = msi_map_pirq_to_vector(dev, dev->irq, 0, 0);
- if (pirq < 0)
- return;
+ if (!save_state || pos <= 0)
+ return;
+ cap = &save_state->data[0];
+
+ control = cap[i++] >> 16;
+ pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, cap[i++]);
+ if (control & PCI_MSI_FLAGS_64BIT) {
+ pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, cap[i++]);
+ pci_write_config_dword(dev, pos + PCI_MSI_DATA_64, cap[i++]);
+ } else
+ pci_write_config_dword(dev, pos + PCI_MSI_DATA_32, cap[i++]);
+ if (control & PCI_MSI_FLAGS_MASKBIT)
+ pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]);
+ pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
+ pci_remove_saved_cap(save_state);
+ kfree(save_state);
}
int pci_save_msix_state(struct pci_dev *dev)
{
int pos;
+ u16 control;
+ struct pci_cap_saved_state *save_state;
unsigned long flags;
struct msi_dev_list *msi_dev_entry;
- struct msi_pirq_entry *pirq_entry, *tmp;
+ struct msi_pirq_entry *pirq_entry;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (pos <= 0 || dev->no_msi)
return 0;
+ printk(KERN_CRIT "Saving MSIX cap\n");
+
/* save the capability */
- if (!dev->msix_enabled)
+ pci_read_config_word(dev, msi_control_reg(pos), &control);
+ if (!(control & PCI_MSIX_FLAGS_ENABLE))
return 0;
+ save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u16),
+ GFP_KERNEL);
+ if (!save_state) {
+ printk(KERN_ERR "Out of memory in pci_save_msix_state\n");
+ return -ENOMEM;
+ }
+ *((u16 *)&save_state->data[0]) = control;
msi_dev_entry = get_msi_dev_pirq_list(dev);
spin_lock_irqsave(&msi_dev_entry->pirq_list_lock, flags);
- list_for_each_entry_safe(pirq_entry, tmp,
- &msi_dev_entry->pirq_list_head, list)
- msi_unmap_pirq(dev, pirq_entry->pirq);
+ list_for_each_entry(pirq_entry, &msi_dev_entry->pirq_list_head, list) {
+ int j;
+ void __iomem *base;
+
+ /* save the table */
+ base = pirq_entry->mask_base;
+ j = pirq_entry->entry_nr;
+ printk(KERN_CRIT "Save msix table entry %d pirq %x base %p\n",
+ j, pirq_entry->pirq, base);
+
+ pirq_entry->address_lo_save =
+ readl(base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
+ pirq_entry->address_hi_save =
+ readl(base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
+ pirq_entry->data_save =
+ readl(base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_DATA_OFFSET);
+ }
spin_unlock_irqrestore(&msi_dev_entry->pirq_list_lock, flags);
- disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
- /* Set the flags for use of restore */
- dev->msix_enabled = 1;
-
+ save_state->cap_nr = PCI_CAP_ID_MSIX;
+ pci_add_saved_cap(dev, save_state);
return 0;
}
void pci_restore_msix_state(struct pci_dev *dev)
{
- int pos;
+ u16 save;
+ int pos, j;
+ void __iomem *base;
+ struct pci_cap_saved_state *save_state;
unsigned long flags;
- u64 table_base;
struct msi_dev_list *msi_dev_entry;
- struct msi_pirq_entry *pirq_entry, *tmp;
+ struct msi_pirq_entry *pirq_entry;
+
+ save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX);
+ if (!save_state)
+ return;
+ printk(KERN_CRIT "Restoring MSIX cap\n");
+
+ save = *((u16 *)&save_state->data[0]);
+ pci_remove_saved_cap(save_state);
+ kfree(save_state);
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (pos <= 0)
return;
- if (!dev->msix_enabled)
- return;
-
msi_dev_entry = get_msi_dev_pirq_list(dev);
- table_base = find_table_base(dev, pos);
- if (!table_base)
- return;
spin_lock_irqsave(&msi_dev_entry->pirq_list_lock, flags);
- list_for_each_entry_safe(pirq_entry, tmp,
- &msi_dev_entry->pirq_list_head, list) {
- int rc = msi_map_pirq_to_vector(dev, pirq_entry->pirq,
- pirq_entry->entry_nr,
table_base);
- if (rc < 0)
- printk(KERN_WARNING
- "%s: re-mapping irq #%d (pirq%d) failed: %d\n",
- pci_name(dev), pirq_entry->entry_nr,
- pirq_entry->pirq, rc);
+ list_for_each_entry(pirq_entry, &msi_dev_entry->pirq_list_head, list) {
+ /* route the table */
+ base = pirq_entry->mask_base;
+ j = pirq_entry->entry_nr;
+
+ printk(KERN_CRIT "Restore msix table entry %d pirq %x base
%p\n",
+ j, pirq_entry->pirq, base);
+ writel(pirq_entry->address_lo_save,
+ base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
+ writel(pirq_entry->address_hi_save,
+ base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
+ writel(pirq_entry->data_save,
+ base + j * PCI_MSIX_ENTRY_SIZE +
+ PCI_MSIX_ENTRY_DATA_OFFSET);
}
spin_unlock_irqrestore(&msi_dev_entry->pirq_list_lock, flags);
+ pci_write_config_word(dev, msi_control_reg(pos), save);
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
}
#endif
@@ -475,7 +554,7 @@ static int msix_capability_init(struct p
pirq = msi_map_vector(dev, entries[i].entry, table_base);
if (pirq < 0)
break;
- attach_pirq_entry(pirq, entries[i].entry, msi_dev_entry);
+ attach_pirq_entry(pirq, entries[i].entry, table_base,
msi_dev_entry);
(entries + i)->vector = pirq;
}
@@ -660,7 +739,7 @@ int pci_enable_msix(struct pci_dev* dev,
if (mapped)
continue;
irq = evtchn_map_pirq(-1, entries[i].vector);
- attach_pirq_entry(irq, entries[i].entry, msi_dev_entry);
+ attach_pirq_entry(irq, entries[i].entry, 0,
msi_dev_entry);
entries[i].vector = irq;
}
return 0;
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