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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 19:54:53 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 20:01:40 (GMT) |
commit | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (patch) | |
tree | 3c2086ab67398a019089a47ca3f362a4bc6db74f /drivers/pci/msi.c | |
parent | 34e84f39a27d059a3e6ec6e8b94aafa702e6f220 (diff) | |
parent | 9173a8ef24a6b1b8031507b35b8ffe5f85a87692 (diff) | |
download | linux-fsl-qoriq-ae19ffbadc1b2100285a5b5b3d0a4e0a11390904.tar.xz |
Merge branch 'master' into for-linus
Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r-- | drivers/pci/msi.c | 283 |
1 files changed, 148 insertions, 135 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index d986afb..f9cf317 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -16,9 +16,8 @@ #include <linux/proc_fs.h> #include <linux/msi.h> #include <linux/smp.h> - -#include <asm/errno.h> -#include <asm/io.h> +#include <linux/errno.h> +#include <linux/io.h> #include "pci.h" #include "msi.h" @@ -272,7 +271,30 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg) write_msi_msg_desc(desc, msg); } -static int msi_free_irqs(struct pci_dev* dev); +static void free_msi_irqs(struct pci_dev *dev) +{ + struct msi_desc *entry, *tmp; + + list_for_each_entry(entry, &dev->msi_list, list) { + int i, nvec; + if (!entry->irq) + continue; + nvec = 1 << entry->msi_attrib.multiple; + for (i = 0; i < nvec; i++) + BUG_ON(irq_has_action(entry->irq + i)); + } + + arch_teardown_msi_irqs(dev); + + list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) { + if (entry->msi_attrib.is_msix) { + if (list_is_last(&entry->list, &dev->msi_list)) + iounmap(entry->mask_base); + } + list_del(&entry->list); + kfree(entry); + } +} static struct msi_desc *alloc_msi_entry(struct pci_dev *dev) { @@ -324,7 +346,7 @@ static void __pci_restore_msix_state(struct pci_dev *dev) if (!dev->msix_enabled) return; BUG_ON(list_empty(&dev->msi_list)); - entry = list_entry(dev->msi_list.next, struct msi_desc, list); + entry = list_first_entry(&dev->msi_list, struct msi_desc, list); pos = entry->msi_attrib.pos; pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); @@ -367,7 +389,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) u16 control; unsigned mask; - pos = pci_find_capability(dev, PCI_CAP_ID_MSI); + pos = pci_find_capability(dev, PCI_CAP_ID_MSI); msi_set_enable(dev, pos, 0); /* Disable MSI during set up */ pci_read_config_word(dev, msi_control_reg(pos), &control); @@ -376,12 +398,12 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) if (!entry) return -ENOMEM; - entry->msi_attrib.is_msix = 0; - entry->msi_attrib.is_64 = is_64bit_address(control); - entry->msi_attrib.entry_nr = 0; - entry->msi_attrib.maskbit = is_mask_bit_support(control); - entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */ - entry->msi_attrib.pos = pos; + entry->msi_attrib.is_msix = 0; + entry->msi_attrib.is_64 = is_64bit_address(control); + entry->msi_attrib.entry_nr = 0; + entry->msi_attrib.maskbit = is_mask_bit_support(control); + entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */ + entry->msi_attrib.pos = pos; entry->mask_pos = msi_mask_reg(pos, entry->msi_attrib.is_64); /* All MSIs are unmasked by default, Mask them all */ @@ -396,7 +418,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI); if (ret) { msi_mask_irq(entry, mask, ~mask); - msi_free_irqs(dev); + free_msi_irqs(dev); return ret; } @@ -409,44 +431,27 @@ static int msi_capability_init(struct pci_dev *dev, int nvec) return 0; } -/** - * msix_capability_init - configure device's MSI-X capability - * @dev: pointer to the pci_dev data structure of MSI-X device function - * @entries: pointer to an array of struct msix_entry entries - * @nvec: number of @entries - * - * Setup the MSI-X capability structure of device function with a - * single MSI-X irq. A return of zero indicates the successful setup of - * requested MSI-X entries with allocated irqs or non-zero for otherwise. - **/ -static int msix_capability_init(struct pci_dev *dev, - struct msix_entry *entries, int nvec) +static void __iomem *msix_map_region(struct pci_dev *dev, unsigned pos, + unsigned nr_entries) { - struct msi_desc *entry; - int pos, i, j, nr_entries, ret; unsigned long phys_addr; u32 table_offset; - u16 control; u8 bir; - void __iomem *base; - pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); - pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); - - /* Ensure MSI-X is disabled while it is set up */ - control &= ~PCI_MSIX_FLAGS_ENABLE; - pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); - - /* Request & Map MSI-X table region */ - 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); 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; + phys_addr = pci_resource_start(dev, bir) + table_offset; + + return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE); +} + +static int msix_setup_entries(struct pci_dev *dev, unsigned pos, + void __iomem *base, struct msix_entry *entries, + int nvec) +{ + struct msi_desc *entry; + int i; for (i = 0; i < nvec; i++) { entry = alloc_msi_entry(dev); @@ -454,41 +459,78 @@ static int msix_capability_init(struct pci_dev *dev, if (!i) iounmap(base); else - msi_free_irqs(dev); + free_msi_irqs(dev); /* No enough memory. Don't try again */ return -ENOMEM; } - j = entries[i].entry; - entry->msi_attrib.is_msix = 1; - entry->msi_attrib.is_64 = 1; - entry->msi_attrib.entry_nr = j; - entry->msi_attrib.default_irq = dev->irq; - entry->msi_attrib.pos = pos; - entry->mask_base = base; + entry->msi_attrib.is_msix = 1; + entry->msi_attrib.is_64 = 1; + entry->msi_attrib.entry_nr = entries[i].entry; + entry->msi_attrib.default_irq = dev->irq; + entry->msi_attrib.pos = pos; + entry->mask_base = base; list_add_tail(&entry->list, &dev->msi_list); } - ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX); - if (ret < 0) { - /* If we had some success report the number of irqs - * we succeeded in setting up. */ - int avail = 0; - list_for_each_entry(entry, &dev->msi_list, list) { - if (entry->irq != 0) { - avail++; - } - } + return 0; +} - if (avail != 0) - ret = avail; +static void msix_program_entries(struct pci_dev *dev, + struct msix_entry *entries) +{ + struct msi_desc *entry; + int i = 0; + + list_for_each_entry(entry, &dev->msi_list, list) { + int offset = entries[i].entry * PCI_MSIX_ENTRY_SIZE + + PCI_MSIX_ENTRY_VECTOR_CTRL; + + entries[i].vector = entry->irq; + set_irq_msi(entry->irq, entry); + entry->masked = readl(entry->mask_base + offset); + msix_mask_irq(entry, 1); + i++; } +} - if (ret) { - msi_free_irqs(dev); +/** + * msix_capability_init - configure device's MSI-X capability + * @dev: pointer to the pci_dev data structure of MSI-X device function + * @entries: pointer to an array of struct msix_entry entries + * @nvec: number of @entries + * + * Setup the MSI-X capability structure of device function with a + * single MSI-X irq. A return of zero indicates the successful setup of + * requested MSI-X entries with allocated irqs or non-zero for otherwise. + **/ +static int msix_capability_init(struct pci_dev *dev, + struct msix_entry *entries, int nvec) +{ + int pos, ret; + u16 control; + void __iomem *base; + + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); + pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control); + + /* Ensure MSI-X is disabled while it is set up */ + control &= ~PCI_MSIX_FLAGS_ENABLE; + pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); + + /* Request & Map MSI-X table region */ + base = msix_map_region(dev, pos, multi_msix_capable(control)); + if (!base) + return -ENOMEM; + + ret = msix_setup_entries(dev, pos, base, entries, nvec); + if (ret) return ret; - } + + ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX); + if (ret) + goto error; /* * Some devices require MSI-X to be enabled before we can touch the @@ -498,16 +540,7 @@ static int msix_capability_init(struct pci_dev *dev, control |= PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE; pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); - i = 0; - list_for_each_entry(entry, &dev->msi_list, list) { - entries[i].vector = entry->irq; - set_irq_msi(entry->irq, entry); - j = entries[i].entry; - entry->masked = readl(base + j * PCI_MSIX_ENTRY_SIZE + - PCI_MSIX_ENTRY_VECTOR_CTRL); - msix_mask_irq(entry, 1); - i++; - } + msix_program_entries(dev, entries); /* Set MSI-X enabled bits and unmask the function */ pci_intx_for_msi(dev, 0); @@ -517,6 +550,27 @@ static int msix_capability_init(struct pci_dev *dev, pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control); return 0; + +error: + if (ret < 0) { + /* + * If we had some success, report the number of irqs + * we succeeded in setting up. + */ + struct msi_desc *entry; + int avail = 0; + + list_for_each_entry(entry, &dev->msi_list, list) { + if (entry->irq != 0) + avail++; + } + if (avail != 0) + ret = avail; + } + + free_msi_irqs(dev); + + return ret; } /** @@ -529,7 +583,7 @@ static int msix_capability_init(struct pci_dev *dev, * to determine if MSI/-X are supported for the device. If MSI/-X is * supported return 0, else return an error code. **/ -static int pci_msi_check_device(struct pci_dev* dev, int nvec, int type) +static int pci_msi_check_device(struct pci_dev *dev, int nvec, int type) { struct pci_bus *bus; int ret; @@ -546,8 +600,9 @@ static int pci_msi_check_device(struct pci_dev* dev, int nvec, int type) if (nvec < 1) return -ERANGE; - /* Any bridge which does NOT route MSI transactions from it's - * secondary bus to it's primary bus must set NO_MSI flag on + /* + * Any bridge which does NOT route MSI transactions from its + * secondary bus to its primary bus must set NO_MSI flag on * the secondary pci_bus. * We expect only arch-specific PCI host bus controller driver * or quirks for specific PCI bridges to be setting NO_MSI. @@ -638,50 +693,16 @@ void pci_msi_shutdown(struct pci_dev *dev) dev->irq = desc->msi_attrib.default_irq; } -void pci_disable_msi(struct pci_dev* dev) +void pci_disable_msi(struct pci_dev *dev) { - struct msi_desc *entry; - if (!pci_msi_enable || !dev || !dev->msi_enabled) return; pci_msi_shutdown(dev); - - entry = list_entry(dev->msi_list.next, struct msi_desc, list); - if (entry->msi_attrib.is_msix) - return; - - msi_free_irqs(dev); + free_msi_irqs(dev); } EXPORT_SYMBOL(pci_disable_msi); -static int msi_free_irqs(struct pci_dev* dev) -{ - struct msi_desc *entry, *tmp; - - list_for_each_entry(entry, &dev->msi_list, list) { - int i, nvec; - if (!entry->irq) - continue; - nvec = 1 << entry->msi_attrib.multiple; - for (i = 0; i < nvec; i++) - BUG_ON(irq_has_action(entry->irq + i)); - } - - arch_teardown_msi_irqs(dev); - - list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) { - if (entry->msi_attrib.is_msix) { - if (list_is_last(&entry->list, &dev->msi_list)) - iounmap(entry->mask_base); - } - list_del(&entry->list); - kfree(entry); - } - - return 0; -} - /** * pci_msix_table_size - return the number of device's MSI-X table entries * @dev: pointer to the pci_dev data structure of MSI-X device function @@ -714,13 +735,13 @@ int pci_msix_table_size(struct pci_dev *dev) * of irqs or MSI-X vectors available. Driver should use the returned value to * re-send its request. **/ -int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) +int pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries, int nvec) { int status, nr_entries; int i, j; if (!entries) - return -EINVAL; + return -EINVAL; status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSIX); if (status) @@ -742,7 +763,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) WARN_ON(!!dev->msix_enabled); /* Check whether driver already requested for MSI irq */ - if (dev->msi_enabled) { + if (dev->msi_enabled) { dev_info(&dev->dev, "can't enable MSI-X " "(MSI IRQ already assigned)\n"); return -EINVAL; @@ -752,12 +773,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) } EXPORT_SYMBOL(pci_enable_msix); -static void msix_free_all_irqs(struct pci_dev *dev) -{ - msi_free_irqs(dev); -} - -void pci_msix_shutdown(struct pci_dev* dev) +void pci_msix_shutdown(struct pci_dev *dev) { struct msi_desc *entry; @@ -774,14 +790,14 @@ void pci_msix_shutdown(struct pci_dev* dev) pci_intx_for_msi(dev, 1); dev->msix_enabled = 0; } -void pci_disable_msix(struct pci_dev* dev) + +void pci_disable_msix(struct pci_dev *dev) { if (!pci_msi_enable || !dev || !dev->msix_enabled) return; pci_msix_shutdown(dev); - - msix_free_all_irqs(dev); + free_msi_irqs(dev); } EXPORT_SYMBOL(pci_disable_msix); @@ -794,16 +810,13 @@ EXPORT_SYMBOL(pci_disable_msix); * allocated for this device function, are reclaimed to unused state, * which may be used later on. **/ -void msi_remove_pci_irq_vectors(struct pci_dev* dev) +void msi_remove_pci_irq_vectors(struct pci_dev *dev) { if (!pci_msi_enable || !dev) - return; - - if (dev->msi_enabled) - msi_free_irqs(dev); + return; - if (dev->msix_enabled) - msix_free_all_irqs(dev); + if (dev->msi_enabled || dev->msix_enabled) + free_msi_irqs(dev); } void pci_no_msi(void) |