diff options
author | Shaohua Li <shaohua.li@intel.com> | 2006-02-08 10:11:38 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-04-14 21:25:25 +0200 |
commit | 41017f0cac925e4a6bcf3359b75e5538112d4216 (patch) | |
tree | 5c8f4590707450820ffb286f681bcaeb300cde84 /drivers/pci | |
parent | [PATCH] Enhancing accessibility of lxdialog (diff) | |
download | linux-41017f0cac925e4a6bcf3359b75e5538112d4216.tar.xz linux-41017f0cac925e4a6bcf3359b75e5538112d4216.zip |
[PATCH] PCI: MSI(X) save/restore for suspend/resume
Add MSI(X) configure sapce save/restore in generic PCI helper.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/msi.c | 227 | ||||
-rw-r--r-- | drivers/pci/pci.c | 6 | ||||
-rw-r--r-- | drivers/pci/pci.h | 11 |
3 files changed, 215 insertions, 29 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index a77e79c8c82e..2087a397ef16 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -504,6 +504,201 @@ void pci_scan_msi_device(struct pci_dev *dev) nr_reserved_vectors++; } +#ifdef CONFIG_PM +int pci_save_msi_state(struct pci_dev *dev) +{ + 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; + + pci_read_config_word(dev, msi_control_reg(pos), &control); + if (!(control & PCI_MSI_FLAGS_ENABLE)) + return 0; + + 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++]); + disable_msi_mode(dev, pos, PCI_CAP_ID_MSI); + 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 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 (!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; + + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (pos <= 0 || dev->no_msi) + return 0; + + 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; + + disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); + 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) +{ + u16 save; + int pos; + int vector, head, tail = 0; + void __iomem *base; + int j; + struct msg_address address; + struct msg_data data; + struct msi_desc *entry; + int temp; + struct pci_cap_saved_state *save_state; + + save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX); + if (!save_state) + return; + 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; + + /* route the table */ + temp = dev->irq; + if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) + return; + vector = head = dev->irq; + while (head != tail) { + entry = msi_desc[vector]; + base = entry->mask_base; + j = entry->msi_attrib.entry_nr; + + msi_address_init(&address); + msi_data_init(&data, vector); + + address.lo_address.value &= MSI_ADDRESS_DEST_ID_MASK; + address.lo_address.value |= entry->msi_attrib.current_cpu << + MSI_TARGET_CPU_SHIFT; + + writel(address.lo_address.value, + base + j * PCI_MSIX_ENTRY_SIZE + + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); + writel(address.hi_address, + base + j * PCI_MSIX_ENTRY_SIZE + + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); + writel(*(u32*)&data, + base + j * PCI_MSIX_ENTRY_SIZE + + PCI_MSIX_ENTRY_DATA_OFFSET); + + tail = msi_desc[vector]->link.tail; + vector = tail; + } + dev->irq = temp; + + pci_write_config_word(dev, msi_control_reg(pos), save); + enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); +} +#endif + +static void msi_register_init(struct pci_dev *dev, struct msi_desc *entry) +{ + struct msg_address address; + struct msg_data data; + int pos, vector = dev->irq; + u16 control; + + pos = pci_find_capability(dev, PCI_CAP_ID_MSI); + pci_read_config_word(dev, msi_control_reg(pos), &control); + /* Configure MSI capability structure */ + msi_address_init(&address); + msi_data_init(&data, vector); + entry->msi_attrib.current_cpu = ((address.lo_address.u.dest_id >> + MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK); + pci_write_config_dword(dev, msi_lower_address_reg(pos), + address.lo_address.value); + if (is_64bit_address(control)) { + pci_write_config_dword(dev, + msi_upper_address_reg(pos), address.hi_address); + pci_write_config_word(dev, + msi_data_reg(pos, 1), *((u32*)&data)); + } else + pci_write_config_word(dev, + msi_data_reg(pos, 0), *((u32*)&data)); + if (entry->msi_attrib.maskbit) { + unsigned int maskbits, temp; + /* All MSIs are unmasked by default, Mask them all */ + pci_read_config_dword(dev, + msi_mask_bits_reg(pos, is_64bit_address(control)), + &maskbits); + temp = (1 << multi_msi_capable(control)); + temp = ((temp - 1) & ~temp); + maskbits |= temp; + pci_write_config_dword(dev, + msi_mask_bits_reg(pos, is_64bit_address(control)), + maskbits); + } +} + /** * msi_capability_init - configure device's MSI capability structure * @dev: pointer to the pci_dev data structure of MSI device function @@ -516,8 +711,6 @@ void pci_scan_msi_device(struct pci_dev *dev) static int msi_capability_init(struct pci_dev *dev) { struct msi_desc *entry; - struct msg_address address; - struct msg_data data; int pos, vector; u16 control; @@ -549,33 +742,8 @@ static int msi_capability_init(struct pci_dev *dev) /* Replace with MSI handler */ irq_handler_init(PCI_CAP_ID_MSI, vector, entry->msi_attrib.maskbit); /* Configure MSI capability structure */ - msi_address_init(&address); - msi_data_init(&data, vector); - entry->msi_attrib.current_cpu = ((address.lo_address.u.dest_id >> - MSI_TARGET_CPU_SHIFT) & MSI_TARGET_CPU_MASK); - pci_write_config_dword(dev, msi_lower_address_reg(pos), - address.lo_address.value); - if (is_64bit_address(control)) { - pci_write_config_dword(dev, - msi_upper_address_reg(pos), address.hi_address); - pci_write_config_word(dev, - msi_data_reg(pos, 1), *((u32*)&data)); - } else - pci_write_config_word(dev, - msi_data_reg(pos, 0), *((u32*)&data)); - if (entry->msi_attrib.maskbit) { - unsigned int maskbits, temp; - /* All MSIs are unmasked by default, Mask them all */ - pci_read_config_dword(dev, - msi_mask_bits_reg(pos, is_64bit_address(control)), - &maskbits); - temp = (1 << multi_msi_capable(control)); - temp = ((temp - 1) & ~temp); - maskbits |= temp; - pci_write_config_dword(dev, - msi_mask_bits_reg(pos, is_64bit_address(control)), - maskbits); - } + msi_register_init(dev, entry); + attach_msi_entry(entry, vector); /* Set MSI enabled bits */ enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); @@ -731,6 +899,7 @@ int pci_enable_msi(struct pci_dev* dev) vector_irq[dev->irq] = -1; nr_released_vectors--; spin_unlock_irqrestore(&msi_lock, flags); + msi_register_init(dev, msi_desc[dev->irq]); enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); return 0; } diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index bea1ad1ad5ba..69a617d21824 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -444,6 +444,10 @@ pci_save_state(struct pci_dev *dev) /* XXX: 100% dword access ok here? */ for (i = 0; i < 16; i++) pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]); + if ((i = pci_save_msi_state(dev)) != 0) + return i; + if ((i = pci_save_msix_state(dev)) != 0) + return i; return 0; } @@ -458,6 +462,8 @@ pci_restore_state(struct pci_dev *dev) for (i = 0; i < 16; i++) pci_write_config_dword(dev,i * 4, dev->saved_config_space[i]); + pci_restore_msi_state(dev); + pci_restore_msix_state(dev); return 0; } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 8f3fb47ea671..30630cbe2fe3 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -55,6 +55,17 @@ void pci_no_msi(void); static inline void disable_msi_mode(struct pci_dev *dev, int pos, int type) { } static inline void pci_no_msi(void) { } #endif +#if defined(CONFIG_PCI_MSI) && defined(CONFIG_PM) +int pci_save_msi_state(struct pci_dev *dev); +int pci_save_msix_state(struct pci_dev *dev); +void pci_restore_msi_state(struct pci_dev *dev); +void pci_restore_msix_state(struct pci_dev *dev); +#else +static inline int pci_save_msi_state(struct pci_dev *dev) { return 0; } +static inline int pci_save_msix_state(struct pci_dev *dev) { return 0; } +static inline void pci_restore_msi_state(struct pci_dev *dev) {} +static inline void pci_restore_msix_state(struct pci_dev *dev) {} +#endif extern int pcie_mch_quirk; extern struct device_attribute pci_dev_attrs[]; |