From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e8.ny.us.ibm.com ([32.97.182.138]:50393 "EHLO e8.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161463Ab3DECyq (ORCPT ); Thu, 4 Apr 2013 22:54:46 -0400 Received: from /spool/local by e8.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Thu, 4 Apr 2013 22:54:45 -0400 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by d01dlp01.pok.ibm.com (Postfix) with ESMTP id 1677E38C801A for ; Thu, 4 Apr 2013 22:54:38 -0400 (EDT) Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r352sbej347492 for ; Thu, 4 Apr 2013 22:54:38 -0400 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r352sbfM009593 for ; Thu, 4 Apr 2013 20:54:37 -0600 From: Gavin Shan To: linux-pci@vger.kernel.org Cc: bhelgaas@google.com, Gavin Shan Subject: [PATCH 1/4] PCI: Cache MSI/MSI-X cap in PCI device Date: Fri, 5 Apr 2013 10:54:30 +0800 Message-Id: <1365130473-7413-2-git-send-email-shangw@linux.vnet.ibm.com> In-Reply-To: <1365130473-7413-1-git-send-email-shangw@linux.vnet.ibm.com> References: <1365130473-7413-1-git-send-email-shangw@linux.vnet.ibm.com> Sender: linux-pci-owner@vger.kernel.org List-ID: The patch caches the MSI and MSI-X capability offset in PCI device (struct pci_dev) so that we needn't poll it from the config space upon enabling or disabling MSI or MSI-X interrupts. Besides, the data type of cached PM capability (pm_cap), which is PCI stuff intead of PCIe stuff, in pci_dev has been changed to "u8" according to Bjorn's suggestion. Signed-off-by: Gavin Shan --- drivers/pci/msi.c | 43 ++++++++++++++++++++----------------------- include/linux/pci.h | 4 +++- 2 files changed, 23 insertions(+), 24 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 00cc78c..5fdc5d9 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -111,32 +111,26 @@ void default_restore_msi_irqs(struct pci_dev *dev, int irq) } #endif -static void msi_set_enable(struct pci_dev *dev, int pos, int enable) +static void msi_set_enable(struct pci_dev *dev, int enable) { u16 control; - BUG_ON(!pos); - - pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control); + pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); control &= ~PCI_MSI_FLAGS_ENABLE; if (enable) control |= PCI_MSI_FLAGS_ENABLE; - pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control); + pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control); } static void msix_set_enable(struct pci_dev *dev, int enable) { - int pos; u16 control; - pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); - if (pos) { - pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); - control &= ~PCI_MSIX_FLAGS_ENABLE; - if (enable) - control |= PCI_MSIX_FLAGS_ENABLE; - pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); - } + pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control); + control &= ~PCI_MSIX_FLAGS_ENABLE; + if (enable) + control |= PCI_MSIX_FLAGS_ENABLE; + pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, control); } static inline __attribute_const__ u32 msi_mask(unsigned x) @@ -402,7 +396,7 @@ static void __pci_restore_msi_state(struct pci_dev *dev) pos = entry->msi_attrib.pos; pci_intx_for_msi(dev, 0); - msi_set_enable(dev, pos, 0); + msi_set_enable(dev, 0); arch_restore_msi_irqs(dev, dev->irq); pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control); @@ -557,7 +551,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) unsigned mask; pos = pci_find_capability(dev, PCI_CAP_ID_MSI); - msi_set_enable(dev, pos, 0); /* Disable MSI during set up */ + msi_set_enable(dev, 0); /* Disable MSI during set up */ pci_read_config_word(dev, msi_control_reg(pos), &control); /* MSI Entry Initialization */ @@ -598,7 +592,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) /* Set MSI enabled bits */ pci_intx_for_msi(dev, 0); - msi_set_enable(dev, pos, 1); + msi_set_enable(dev, 1); dev->msi_enabled = 1; dev->irq = entry->irq; @@ -885,7 +879,7 @@ void pci_msi_shutdown(struct pci_dev *dev) desc = list_first_entry(&dev->msi_list, struct msi_desc, list); pos = desc->msi_attrib.pos; - msi_set_enable(dev, pos, 0); + msi_set_enable(dev, 0); pci_intx_for_msi(dev, 1); dev->msi_enabled = 0; @@ -1048,15 +1042,18 @@ EXPORT_SYMBOL(pci_msi_enabled); void pci_msi_init_pci_dev(struct pci_dev *dev) { - int pos; INIT_LIST_HEAD(&dev->msi_list); /* Disable the msi hardware to avoid screaming interrupts * during boot. This is the power on reset default so * usually this should be a noop. */ - pos = pci_find_capability(dev, PCI_CAP_ID_MSI); - if (pos) - msi_set_enable(dev, pos, 0); - msix_set_enable(dev, 0); + dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI); + if (dev->msi_cap) + msi_set_enable(dev, 0); + + /* We needn't check if we have valid MSI-X capability here */ + dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (dev->msix_cap) + msix_set_enable(dev, 0); } diff --git a/include/linux/pci.h b/include/linux/pci.h index 2461033a..3e23895 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -249,7 +249,9 @@ struct pci_dev { pci_power_t current_state; /* Current operating state. In ACPI-speak, this is D0-D3, D0 being fully functional, and D3 being off. */ - int pm_cap; /* PM capability offset in the + u8 msi_cap; /* MSI capability offset */ + u8 msix_cap; /* MSI-X capability offset */ + u8 pm_cap; /* PM capability offset in the configuration space */ unsigned int pme_support:5; /* Bitmask of states from which PME# can be generated */ -- 1.7.5.4