diff options
Diffstat (limited to 'drivers/pci/msi.h')
| -rw-r--r-- | drivers/pci/msi.h | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/pci/msi.h b/drivers/pci/msi.h new file mode 100644 index 00000000000..bef21ae3cbd --- /dev/null +++ b/drivers/pci/msi.h @@ -0,0 +1,159 @@ +/* + * Copyright (C) 2003-2004 Intel + * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) + */ + +#ifndef MSI_H +#define MSI_H + +#include <asm/msi.h> + +/* + * Assume the maximum number of hot plug slots supported by the system is about + * ten. The worstcase is that each of these slots is hot-added with a device, + * which has two MSI/MSI-X capable functions. To avoid any MSI-X driver, which + * attempts to request all available vectors, NR_HP_RESERVED_VECTORS is defined + * as below to ensure at least one message is assigned to each detected MSI/ + * MSI-X device function. + */ +#define NR_HP_RESERVED_VECTORS 20 + +extern int vector_irq[NR_VECTORS]; +extern cpumask_t pending_irq_balance_cpumask[NR_IRQS]; +extern void (*interrupt[NR_IRQS])(void); +extern int pci_vector_resources(int last, int nr_released); + +#ifdef CONFIG_SMP +#define set_msi_irq_affinity set_msi_affinity +#else +#define set_msi_irq_affinity NULL +#endif + +#ifndef CONFIG_IRQBALANCE +static inline void move_msi(int vector) {} +#endif + +/* + * MSI-X Address Register + */ +#define PCI_MSIX_FLAGS_QSIZE 0x7FF +#define PCI_MSIX_FLAGS_ENABLE (1 << 15) +#define PCI_MSIX_FLAGS_BIRMASK (7 << 0) +#define PCI_MSIX_FLAGS_BITMASK (1 << 0) + +#define PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET 0 +#define PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET 4 +#define PCI_MSIX_ENTRY_DATA_OFFSET 8 +#define PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET 12 +#define PCI_MSIX_ENTRY_SIZE 16 + +#define msi_control_reg(base) (base + PCI_MSI_FLAGS) +#define msi_lower_address_reg(base) (base + PCI_MSI_ADDRESS_LO) +#define msi_upper_address_reg(base) (base + PCI_MSI_ADDRESS_HI) +#define msi_data_reg(base, is64bit) \ + ( (is64bit == 1) ? base+PCI_MSI_DATA_64 : base+PCI_MSI_DATA_32 ) +#define msi_mask_bits_reg(base, is64bit) \ + ( (is64bit == 1) ? base+PCI_MSI_MASK_BIT : base+PCI_MSI_MASK_BIT-4) +#define msi_disable(control) control &= ~PCI_MSI_FLAGS_ENABLE +#define multi_msi_capable(control) \ + (1 << ((control & PCI_MSI_FLAGS_QMASK) >> 1)) +#define multi_msi_enable(control, num) \ + control |= (((num >> 1) << 4) & PCI_MSI_FLAGS_QSIZE); +#define is_64bit_address(control) (control & PCI_MSI_FLAGS_64BIT) +#define is_mask_bit_support(control) (control & PCI_MSI_FLAGS_MASKBIT) +#define msi_enable(control, num) multi_msi_enable(control, num); \ + control |= PCI_MSI_FLAGS_ENABLE + +#define msix_control_reg msi_control_reg +#define msix_table_offset_reg(base) (base + 0x04) +#define msix_pba_offset_reg(base) (base + 0x08) +#define msix_enable(control) control |= PCI_MSIX_FLAGS_ENABLE +#define msix_disable(control) control &= ~PCI_MSIX_FLAGS_ENABLE +#define msix_table_size(control) ((control & PCI_MSIX_FLAGS_QSIZE)+1) +#define multi_msix_capable msix_table_size +#define msix_unmask(address) (address & ~PCI_MSIX_FLAGS_BITMASK) +#define msix_mask(address) (address | PCI_MSIX_FLAGS_BITMASK) +#define msix_is_pending(address) (address & PCI_MSIX_FLAGS_PENDMASK) + +/* + * MSI Defined Data Structures + */ +#define MSI_ADDRESS_HEADER 0xfee +#define MSI_ADDRESS_HEADER_SHIFT 12 +#define MSI_ADDRESS_HEADER_MASK 0xfff000 +#define MSI_ADDRESS_DEST_ID_MASK 0xfff0000f +#define MSI_TARGET_CPU_MASK 0xff +#define MSI_DELIVERY_MODE 0 +#define MSI_LEVEL_MODE 1 /* Edge always assert */ +#define MSI_TRIGGER_MODE 0 /* MSI is edge sensitive */ +#define MSI_PHYSICAL_MODE 0 +#define MSI_LOGICAL_MODE 1 +#define MSI_REDIRECTION_HINT_MODE 0 + +struct msg_data { +#if defined(__LITTLE_ENDIAN_BITFIELD) + __u32 vector : 8; + __u32 delivery_mode : 3; /* 000b: FIXED | 001b: lowest prior */ + __u32 reserved_1 : 3; + __u32 level : 1; /* 0: deassert | 1: assert */ + __u32 trigger : 1; /* 0: edge | 1: level */ + __u32 reserved_2 : 16; +#elif defined(__BIG_ENDIAN_BITFIELD) + __u32 reserved_2 : 16; + __u32 trigger : 1; /* 0: edge | 1: level */ + __u32 level : 1; /* 0: deassert | 1: assert */ + __u32 reserved_1 : 3; + __u32 delivery_mode : 3; /* 000b: FIXED | 001b: lowest prior */ + __u32 vector : 8; +#else +#error "Bitfield endianness not defined! Check your byteorder.h" +#endif +} __attribute__ ((packed)); + +struct msg_address { + union { + struct { +#if defined(__LITTLE_ENDIAN_BITFIELD) + __u32 reserved_1 : 2; + __u32 dest_mode : 1; /*0:physic | 1:logic */ + __u32 redirection_hint: 1; /*0: dedicated CPU + 1: lowest priority */ + __u32 reserved_2 : 4; + __u32 dest_id : 24; /* Destination ID */ +#elif defined(__BIG_ENDIAN_BITFIELD) + __u32 dest_id : 24; /* Destination ID */ + __u32 reserved_2 : 4; + __u32 redirection_hint: 1; /*0: dedicated CPU + 1: lowest priority */ + __u32 dest_mode : 1; /*0:physic | 1:logic */ + __u32 reserved_1 : 2; +#else +#error "Bitfield endianness not defined! Check your byteorder.h" +#endif + }u; + __u32 value; + }lo_address; + __u32 hi_address; +} __attribute__ ((packed)); + +struct msi_desc { + struct { + __u8 type : 5; /* {0: unused, 5h:MSI, 11h:MSI-X} */ + __u8 maskbit : 1; /* mask-pending bit supported ? */ + __u8 state : 1; /* {0: free, 1: busy} */ + __u8 reserved: 1; /* reserved */ + __u8 entry_nr; /* specific enabled entry */ + __u8 default_vector; /* default pre-assigned vector */ + __u8 current_cpu; /* current destination cpu */ + }msi_attrib; + + struct { + __u16 head; + __u16 tail; + }link; + + void __iomem *mask_base; + struct pci_dev *dev; +}; + +#endif /* MSI_H */ |