From b64c05e7de6071694dd6840eac9724a006ee19f8 Mon Sep 17 00:00:00 2001 From: Grant Grundler Date: Sat, 14 Jan 2006 00:34:53 -0700 Subject: [PATCH] PCI: clean up msi.c a bit Clean up: move assignments outside of if() statements. AFAICT, no functional change. Easier to read/understand. Depends on "[PATCH 1/3] msi vector targeting abstractions" by Mark Maule . I expect one hunk to fail if applied against 2.6.15. This is essentially Joe Perches' patch. I've cleaned up the one instance added by Mark's patch. Signed-off-by: Grant Grundler Signed-off-by: Greg Kroah-Hartman --- drivers/pci/msi.c | 55 +++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 35 insertions(+), 20 deletions(-) (limited to 'drivers/pci/msi.c') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 48723d6fa60f..d5a67c1bcb98 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -103,9 +103,9 @@ static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask) switch (entry->msi_attrib.type) { case PCI_CAP_ID_MSI: { - int pos; + int pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI); - if (!(pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI))) + if (!pos) return; pci_read_config_dword(entry->dev, msi_lower_address_reg(pos), @@ -347,9 +347,9 @@ static int assign_msi_vector(void) static int get_new_vector(void) { - int vector; + int vector = assign_msi_vector(); - if ((vector = assign_msi_vector()) > 0) + if (vector > 0) set_intr_gate(vector, interrupt[vector]); return vector; @@ -369,7 +369,8 @@ static int msi_init(void) return status; } - if ((status = msi_cache_init()) < 0) { + status = msi_cache_init(); + if (status < 0) { pci_msi_enable = 0; printk(KERN_WARNING "PCI: MSI cache init failed\n"); return status; @@ -523,10 +524,12 @@ static int msi_capability_init(struct pci_dev *dev) pos = pci_find_capability(dev, PCI_CAP_ID_MSI); pci_read_config_word(dev, msi_control_reg(pos), &control); /* MSI Entry Initialization */ - if (!(entry = alloc_msi_entry())) + entry = alloc_msi_entry(); + if (!entry) return -ENOMEM; - if ((vector = get_msi_vector(dev)) < 0) { + vector = get_msi_vector(dev); + if (vector < 0) { kmem_cache_free(msi_cachep, entry); return -EBUSY; } @@ -620,7 +623,8 @@ static int msix_capability_init(struct pci_dev *dev, entry = alloc_msi_entry(); if (!entry) break; - if ((vector = get_msi_vector(dev)) < 0) + vector = get_msi_vector(dev); + if (vector < 0) break; j = entries[i].entry; @@ -701,10 +705,12 @@ int pci_enable_msi(struct pci_dev* dev) temp = dev->irq; - if ((status = msi_init()) < 0) + status = msi_init(); + if (status < 0) return status; - if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSI))) + pos = pci_find_capability(dev, PCI_CAP_ID_MSI); + if (!pos) return -EINVAL; pci_read_config_word(dev, msi_control_reg(pos), &control); @@ -728,8 +734,8 @@ int pci_enable_msi(struct pci_dev* dev) dev->irq = temp; } /* Check whether driver already requested for MSI-X vectors */ - if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)) > 0 && - !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { printk(KERN_INFO "PCI: %s: Can't enable MSI. " "Device already has MSI-X vectors assigned\n", pci_name(dev)); @@ -755,7 +761,10 @@ void pci_disable_msi(struct pci_dev* dev) u16 control; unsigned long flags; - if (!dev || !(pos = pci_find_capability(dev, PCI_CAP_ID_MSI))) + if (!dev) + return; + pos = pci_find_capability(dev, PCI_CAP_ID_MSI); + if (!pos) return; pci_read_config_word(dev, msi_control_reg(pos), &control); @@ -924,10 +933,12 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) if (!pci_msi_enable || !dev || !entries) return -EINVAL; - if ((status = msi_init()) < 0) + status = msi_init(); + if (status < 0) return status; - if (!(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX))) + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (!pos) return -EINVAL; pci_read_config_word(dev, msi_control_reg(pos), &control); @@ -1006,7 +1017,11 @@ void pci_disable_msix(struct pci_dev* dev) int pos, temp; u16 control; - if (!dev || !(pos = pci_find_capability(dev, PCI_CAP_ID_MSIX))) + if (!dev) + return; + + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (!pos) return; pci_read_config_word(dev, msi_control_reg(pos), &control); @@ -1066,8 +1081,8 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev) return; temp = dev->irq; /* Save IOAPIC IRQ */ - if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) > 0 && - !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { + pos = pci_find_capability(dev, PCI_CAP_ID_MSI); + if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { spin_lock_irqsave(&msi_lock, flags); state = msi_desc[dev->irq]->msi_attrib.state; spin_unlock_irqrestore(&msi_lock, flags); @@ -1080,8 +1095,8 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev) msi_free_vector(dev, dev->irq, 0); dev->irq = temp; /* Restore IOAPIC IRQ */ } - if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSIX)) > 0 && - !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { int vector, head, tail = 0, warning = 0; void __iomem *base = NULL; -- cgit v1.2.3 From 6e325a62a0a228cd0222783802b53cce04551776 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Tue, 14 Feb 2006 18:52:22 +0200 Subject: [PATCH] PCI: make MSI quirk inheritable from the pci bus It turns out AMD 8131 quirk only affects MSI for devices behind the 8131 bridge. Handle this by adding a flags field in pci_bus, inherited from parent to child. Signed-off-by: Michael S. Tsirkin Signed-off-by: Greg Kroah-Hartman --- drivers/pci/msi.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/pci/msi.c') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index d5a67c1bcb98..4de1c17ee573 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -703,6 +703,9 @@ int pci_enable_msi(struct pci_dev* dev) if (dev->no_msi) return status; + if (dev->bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) + return -EINVAL; + temp = dev->irq; status = msi_init(); -- cgit v1.2.3 From a0454b40ee8fac03194bb71f01730266506e75e1 Mon Sep 17 00:00:00 2001 From: Grant Grundler Date: Thu, 16 Feb 2006 23:58:29 -0800 Subject: [PATCH] PCI: fix problems with MSI-X on ia64 Use "unsigned long" when dealing with PCI resources. The BAR Indicator Register (BIR) can be a 64-bit value or the resource could be a 64-bit host physical address. Enables ib_mthca and cciss drivers to use MSI-X on ia64 HW. Problem showed up now because of new system firmware on one platform. Symptom will either be memory corruption or MCA. Second part of this patch deals with "useless" code. We walk through the steps to find the phys_addr and then don't use the result. I suspect the intent was to zero out the respective MSI-X entry but I'm not sure at the moment. Delete the code inside the #if 0/#endif if it's really not needed. Signed-off-by: Grant Grundler Signed-off-by: Greg Kroah-Hartman --- drivers/pci/msi.c | 37 ++++++++++++++++++++++++------------- 1 file changed, 24 insertions(+), 13 deletions(-) (limited to 'drivers/pci/msi.c') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 4de1c17ee573..aea8b258b9b8 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -600,7 +600,8 @@ static int msix_capability_init(struct pci_dev *dev, struct msg_address address; struct msg_data data; int vector, pos, i, j, nr_entries, temp = 0; - u32 phys_addr, table_offset; + unsigned long phys_addr; + u32 table_offset; u16 control; u8 bir; void __iomem *base; @@ -609,11 +610,11 @@ static int msix_capability_init(struct pci_dev *dev, /* Request & Map MSI-X table region */ pci_read_config_word(dev, msi_control_reg(pos), &control); nr_entries = multi_msix_capable(control); - pci_read_config_dword(dev, msix_table_offset_reg(pos), - &table_offset); + + pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset); bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); - phys_addr = pci_resource_start (dev, bir); - phys_addr += (u32)(table_offset & ~PCI_MSIX_FLAGS_BIRMASK); + table_offset &= ~PCI_MSIX_FLAGS_BIRMASK; + phys_addr = pci_resource_start (dev, bir) + table_offset; base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE); if (base == NULL) return -ENOMEM; @@ -838,8 +839,10 @@ static int msi_free_vector(struct pci_dev* dev, int vector, int reassign) * Detect last MSI-X vector to be released. * Release the MSI-X memory-mapped table. */ +#if 0 int pos, nr_entries; - u32 phys_addr, table_offset; + unsigned long phys_addr; + u32 table_offset; u16 control; u8 bir; @@ -850,9 +853,12 @@ static int msi_free_vector(struct pci_dev* dev, int vector, int reassign) pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset); bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); - phys_addr = pci_resource_start (dev, bir); - phys_addr += (u32)(table_offset & - ~PCI_MSIX_FLAGS_BIRMASK); + table_offset &= ~PCI_MSIX_FLAGS_BIRMASK; + phys_addr = pci_resource_start(dev, bir) + table_offset; +/* + * FIXME! and what did you want to do with phys_addr? + */ +#endif iounmap(base); } } @@ -1119,7 +1125,9 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev) msi_free_vector(dev, vector, 0); if (warning) { /* Force to release the MSI-X memory-mapped table */ - u32 phys_addr, table_offset; +#if 0 + unsigned long phys_addr; + u32 table_offset; u16 control; u8 bir; @@ -1128,9 +1136,12 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev) pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset); bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); - phys_addr = pci_resource_start (dev, bir); - phys_addr += (u32)(table_offset & - ~PCI_MSIX_FLAGS_BIRMASK); + table_offset &= ~PCI_MSIX_FLAGS_BIRMASK; + phys_addr = pci_resource_start(dev, bir) + table_offset; +/* + * FIXME! and what did you want to do with phys_addr? + */ +#endif iounmap(base); printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() " "called without free_irq() on all MSI-X vectors\n", -- cgit v1.2.3 From 309e57df7b766172ba137a8cbd909f88dd76e8e9 Mon Sep 17 00:00:00 2001 From: Matthew Wilcox Date: Sun, 5 Mar 2006 22:33:34 -0700 Subject: [PATCH] PCI: Provide a boot parameter to disable MSI Several drivers are starting to grow options to disable MSI. However, it's often a host chipset issue, not something which individual drivers should handle. So we add the pci=nomsi kernel parameter to allow the user to disable MSI modes for systems we haven't added to the quirk list yet. Signed-off-by: Matthew Wilcox Signed-off-by: Randy Dunlap Acked-by: Jeff Garzik Signed-off-by: Greg Kroah-Hartman --- drivers/pci/msi.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/pci/msi.c') diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index aea8b258b9b8..a77e79c8c82e 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -765,8 +765,11 @@ void pci_disable_msi(struct pci_dev* dev) u16 control; unsigned long flags; + if (!pci_msi_enable) + return; if (!dev) return; + pos = pci_find_capability(dev, PCI_CAP_ID_MSI); if (!pos) return; @@ -1026,6 +1029,8 @@ void pci_disable_msix(struct pci_dev* dev) int pos, temp; u16 control; + if (!pci_msi_enable) + return; if (!dev) return; @@ -1152,6 +1157,11 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev) } } +void pci_no_msi(void) +{ + pci_msi_enable = 0; +} + EXPORT_SYMBOL(pci_enable_msi); EXPORT_SYMBOL(pci_disable_msi); EXPORT_SYMBOL(pci_enable_msix); -- cgit v1.2.3