mirror of https://gitee.com/openkylin/linux.git
PCI: Reorder pci_enable_acs() and dependencies
Move pci_enable_acs() and dependencies further up in the source code to avoid having to forward declare it when we make it static in near future. No functional changes intended. Link: https://lore.kernel.org/r/20200707224604.3737893-1-rajatja@google.com Signed-off-by: Rajat Jain <rajatja@google.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rajat Jain
Bjorn Helgaas
parent
2194bc7c39
commit
cbe420361f
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@ -777,6 +777,133 @@ int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask)
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return 0;
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}
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static int pci_acs_enable;
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/**
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* pci_request_acs - ask for ACS to be enabled if supported
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*/
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void pci_request_acs(void)
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{
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pci_acs_enable = 1;
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}
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static const char *disable_acs_redir_param;
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/**
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* pci_disable_acs_redir - disable ACS redirect capabilities
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* @dev: the PCI device
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*
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* For only devices specified in the disable_acs_redir parameter.
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*/
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static void pci_disable_acs_redir(struct pci_dev *dev)
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{
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int ret = 0;
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const char *p;
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int pos;
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u16 ctrl;
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if (!disable_acs_redir_param)
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return;
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p = disable_acs_redir_param;
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while (*p) {
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ret = pci_dev_str_match(dev, p, &p);
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if (ret < 0) {
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pr_info_once("PCI: Can't parse disable_acs_redir parameter: %s\n",
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disable_acs_redir_param);
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break;
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} else if (ret == 1) {
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/* Found a match */
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break;
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}
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if (*p != ';' && *p != ',') {
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/* End of param or invalid format */
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break;
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}
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p++;
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}
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if (ret != 1)
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return;
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if (!pci_dev_specific_disable_acs_redir(dev))
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return;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
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if (!pos) {
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pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n");
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return;
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}
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pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
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/* P2P Request & Completion Redirect */
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ctrl &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_EC);
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pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
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pci_info(dev, "disabled ACS redirect\n");
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}
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/**
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* pci_std_enable_acs - enable ACS on devices using standard ACS capabilities
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* @dev: the PCI device
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*/
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static void pci_std_enable_acs(struct pci_dev *dev)
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{
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int pos;
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u16 cap;
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u16 ctrl;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
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if (!pos)
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return;
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pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap);
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pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
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/* Source Validation */
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ctrl |= (cap & PCI_ACS_SV);
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/* P2P Request Redirect */
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ctrl |= (cap & PCI_ACS_RR);
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/* P2P Completion Redirect */
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ctrl |= (cap & PCI_ACS_CR);
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/* Upstream Forwarding */
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ctrl |= (cap & PCI_ACS_UF);
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pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
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}
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/**
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* pci_enable_acs - enable ACS if hardware support it
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* @dev: the PCI device
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*/
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void pci_enable_acs(struct pci_dev *dev)
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{
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if (!pci_acs_enable)
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goto disable_acs_redir;
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if (!pci_dev_specific_enable_acs(dev))
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goto disable_acs_redir;
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pci_std_enable_acs(dev);
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disable_acs_redir:
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/*
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* Note: pci_disable_acs_redir() must be called even if ACS was not
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* enabled by the kernel because it may have been enabled by
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* platform firmware. So if we are told to disable it, we should
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* always disable it after setting the kernel's default
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* preferences.
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*/
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pci_disable_acs_redir(dev);
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}
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/**
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* pci_restore_bars - restore a device's BAR values (e.g. after wake-up)
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* @dev: PCI device to have its BARs restored
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@ -3230,133 +3357,6 @@ void pci_configure_ari(struct pci_dev *dev)
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}
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}
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static int pci_acs_enable;
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/**
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* pci_request_acs - ask for ACS to be enabled if supported
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*/
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void pci_request_acs(void)
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{
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pci_acs_enable = 1;
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}
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static const char *disable_acs_redir_param;
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/**
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* pci_disable_acs_redir - disable ACS redirect capabilities
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* @dev: the PCI device
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*
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* For only devices specified in the disable_acs_redir parameter.
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*/
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static void pci_disable_acs_redir(struct pci_dev *dev)
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{
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int ret = 0;
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const char *p;
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int pos;
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u16 ctrl;
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if (!disable_acs_redir_param)
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return;
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p = disable_acs_redir_param;
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while (*p) {
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ret = pci_dev_str_match(dev, p, &p);
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if (ret < 0) {
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pr_info_once("PCI: Can't parse disable_acs_redir parameter: %s\n",
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disable_acs_redir_param);
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break;
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} else if (ret == 1) {
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/* Found a match */
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break;
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}
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if (*p != ';' && *p != ',') {
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/* End of param or invalid format */
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break;
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}
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p++;
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}
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if (ret != 1)
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return;
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if (!pci_dev_specific_disable_acs_redir(dev))
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return;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
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if (!pos) {
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pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n");
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return;
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}
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pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
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/* P2P Request & Completion Redirect */
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ctrl &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_EC);
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pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
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pci_info(dev, "disabled ACS redirect\n");
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}
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/**
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* pci_std_enable_acs - enable ACS on devices using standard ACS capabilities
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* @dev: the PCI device
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*/
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static void pci_std_enable_acs(struct pci_dev *dev)
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{
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int pos;
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u16 cap;
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u16 ctrl;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
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if (!pos)
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return;
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pci_read_config_word(dev, pos + PCI_ACS_CAP, &cap);
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pci_read_config_word(dev, pos + PCI_ACS_CTRL, &ctrl);
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/* Source Validation */
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ctrl |= (cap & PCI_ACS_SV);
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/* P2P Request Redirect */
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ctrl |= (cap & PCI_ACS_RR);
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/* P2P Completion Redirect */
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ctrl |= (cap & PCI_ACS_CR);
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/* Upstream Forwarding */
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ctrl |= (cap & PCI_ACS_UF);
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pci_write_config_word(dev, pos + PCI_ACS_CTRL, ctrl);
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}
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/**
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* pci_enable_acs - enable ACS if hardware support it
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* @dev: the PCI device
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*/
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void pci_enable_acs(struct pci_dev *dev)
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{
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if (!pci_acs_enable)
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goto disable_acs_redir;
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if (!pci_dev_specific_enable_acs(dev))
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goto disable_acs_redir;
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pci_std_enable_acs(dev);
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disable_acs_redir:
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/*
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* Note: pci_disable_acs_redir() must be called even if ACS was not
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* enabled by the kernel because it may have been enabled by
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* platform firmware. So if we are told to disable it, we should
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* always disable it after setting the kernel's default
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* preferences.
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*/
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pci_disable_acs_redir(dev);
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}
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static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags)
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{
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int pos;
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