e24c2d963a
After seeing, at best, "guesses" as to the following kind of information in several drivers, I decided that we really need a way for platforms to specifically give advice in this area for what works best with their PCI controller implementation. Basically, this new interface gives DMA bursting advice on PCI. There are three forms of the advice: 1) Burst as much as possible, it is not necessary to end bursts on some particular boundary for best performance. 2) Burst on some byte count multiple. A DMA burst to some multiple of number of bytes may be done, but it is important to end the burst on an exact multiple for best performance. The best example of this I am aware of are the PPC64 PCI controllers, where if you end a burst mid-cacheline then chip has to refetch the data and the IOMMU translations which hurts performance a lot. 3) Burst on a single byte count multiple. Bursts shall end exactly on the next multiple boundary for best performance. Sparc64 and Alpha's PCI controllers operate this way. They disconnect any device which tries to burst across a cacheline boundary. Actually, newer sparc64 PCI controllers do not have this behavior. That is why the "pdev" is passed into the interface, so I can add code later to check which PCI controller the system is using and give advice accordingly. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
259 lines
8.3 KiB
C
259 lines
8.3 KiB
C
#ifndef __ASM_PARISC_PCI_H
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#define __ASM_PARISC_PCI_H
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#include <linux/config.h>
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#include <asm/scatterlist.h>
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/*
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** HP PCI platforms generally support multiple bus adapters.
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** (workstations 1-~4, servers 2-~32)
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**
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** Newer platforms number the busses across PCI bus adapters *sparsely*.
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** E.g. 0, 8, 16, ...
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**
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** Under a PCI bus, most HP platforms support PPBs up to two or three
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** levels deep. See "Bit3" product line.
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*/
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#define PCI_MAX_BUSSES 256
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/*
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** pci_hba_data (aka H2P_OBJECT in HP/UX)
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**
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** This is the "common" or "base" data structure which HBA drivers
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** (eg Dino or LBA) are required to place at the top of their own
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** platform_data structure. I've heard this called "C inheritance" too.
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**
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** Data needed by pcibios layer belongs here.
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*/
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struct pci_hba_data {
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void __iomem *base_addr; /* aka Host Physical Address */
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const struct parisc_device *dev; /* device from PA bus walk */
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struct pci_bus *hba_bus; /* primary PCI bus below HBA */
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int hba_num; /* I/O port space access "key" */
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struct resource bus_num; /* PCI bus numbers */
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struct resource io_space; /* PIOP */
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struct resource lmmio_space; /* bus addresses < 4Gb */
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struct resource elmmio_space; /* additional bus addresses < 4Gb */
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struct resource gmmio_space; /* bus addresses > 4Gb */
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/* NOTE: Dino code assumes it can use *all* of the lmmio_space,
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* elmmio_space and gmmio_space as a contiguous array of
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* resources. This #define represents the array size */
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#define DINO_MAX_LMMIO_RESOURCES 3
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unsigned long lmmio_space_offset; /* CPU view - PCI view */
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void * iommu; /* IOMMU this device is under */
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/* REVISIT - spinlock to protect resources? */
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#define HBA_NAME_SIZE 16
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char io_name[HBA_NAME_SIZE];
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char lmmio_name[HBA_NAME_SIZE];
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char elmmio_name[HBA_NAME_SIZE];
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char gmmio_name[HBA_NAME_SIZE];
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};
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#define HBA_DATA(d) ((struct pci_hba_data *) (d))
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/*
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** We support 2^16 I/O ports per HBA. These are set up in the form
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** 0xbbxxxx, where bb is the bus number and xxxx is the I/O port
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** space address.
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*/
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#define HBA_PORT_SPACE_BITS 16
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#define HBA_PORT_BASE(h) ((h) << HBA_PORT_SPACE_BITS)
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#define HBA_PORT_SPACE_SIZE (1UL << HBA_PORT_SPACE_BITS)
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#define PCI_PORT_HBA(a) ((a) >> HBA_PORT_SPACE_BITS)
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#define PCI_PORT_ADDR(a) ((a) & (HBA_PORT_SPACE_SIZE - 1))
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#if CONFIG_64BIT
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#define PCI_F_EXTEND 0xffffffff00000000UL
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#define PCI_IS_LMMIO(hba,a) pci_is_lmmio(hba,a)
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/* We need to know if an address is LMMMIO or GMMIO.
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* LMMIO requires mangling and GMMIO we must use as-is.
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*/
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static __inline__ int pci_is_lmmio(struct pci_hba_data *hba, unsigned long a)
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{
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return(((a) & PCI_F_EXTEND) == PCI_F_EXTEND);
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}
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/*
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** Convert between PCI (IO_VIEW) addresses and processor (PA_VIEW) addresses.
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** See pcibios.c for more conversions used by Generic PCI code.
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*/
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#define PCI_BUS_ADDR(hba,a) (PCI_IS_LMMIO(hba,a) \
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? ((a) - hba->lmmio_space_offset) /* mangle LMMIO */ \
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: (a)) /* GMMIO */
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#define PCI_HOST_ADDR(hba,a) ((a) + hba->lmmio_space_offset)
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#else /* !CONFIG_64BIT */
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#define PCI_BUS_ADDR(hba,a) (a)
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#define PCI_HOST_ADDR(hba,a) (a)
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#define PCI_F_EXTEND 0UL
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#define PCI_IS_LMMIO(hba,a) (1) /* 32-bit doesn't support GMMIO */
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#endif /* !CONFIG_64BIT */
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/*
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** KLUGE: linux/pci.h include asm/pci.h BEFORE declaring struct pci_bus
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** (This eliminates some of the warnings).
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*/
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struct pci_bus;
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struct pci_dev;
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/*
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* If the PCI device's view of memory is the same as the CPU's view of memory,
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* PCI_DMA_BUS_IS_PHYS is true. The networking and block device layers use
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* this boolean for bounce buffer decisions.
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*/
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#ifdef CONFIG_PA20
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/* All PA-2.0 machines have an IOMMU. */
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#define PCI_DMA_BUS_IS_PHYS 0
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#define parisc_has_iommu() do { } while (0)
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#else
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#if defined(CONFIG_IOMMU_CCIO) || defined(CONFIG_IOMMU_SBA)
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extern int parisc_bus_is_phys; /* in arch/parisc/kernel/setup.c */
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#define PCI_DMA_BUS_IS_PHYS parisc_bus_is_phys
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#define parisc_has_iommu() do { parisc_bus_is_phys = 0; } while (0)
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#else
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#define PCI_DMA_BUS_IS_PHYS 1
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#define parisc_has_iommu() do { } while (0)
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#endif
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#endif /* !CONFIG_PA20 */
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/*
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** Most PCI devices (eg Tulip, NCR720) also export the same registers
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** to both MMIO and I/O port space. Due to poor performance of I/O Port
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** access under HP PCI bus adapters, strongly reccomend use of MMIO
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** address space.
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**
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** While I'm at it more PA programming notes:
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**
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** 1) MMIO stores (writes) are posted operations. This means the processor
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** gets an "ACK" before the write actually gets to the device. A read
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** to the same device (or typically the bus adapter above it) will
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** force in-flight write transaction(s) out to the targeted device
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** before the read can complete.
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**
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** 2) The Programmed I/O (PIO) data may not always be strongly ordered with
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** respect to DMA on all platforms. Ie PIO data can reach the processor
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** before in-flight DMA reaches memory. Since most SMP PA platforms
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** are I/O coherent, it generally doesn't matter...but sometimes
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** it does.
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**
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** I've helped device driver writers debug both types of problems.
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*/
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struct pci_port_ops {
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u8 (*inb) (struct pci_hba_data *hba, u16 port);
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u16 (*inw) (struct pci_hba_data *hba, u16 port);
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u32 (*inl) (struct pci_hba_data *hba, u16 port);
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void (*outb) (struct pci_hba_data *hba, u16 port, u8 data);
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void (*outw) (struct pci_hba_data *hba, u16 port, u16 data);
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void (*outl) (struct pci_hba_data *hba, u16 port, u32 data);
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};
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struct pci_bios_ops {
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void (*init)(void);
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void (*fixup_bus)(struct pci_bus *bus);
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};
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/* pci_unmap_{single,page} is not a nop, thus... */
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#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \
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dma_addr_t ADDR_NAME;
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#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \
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__u32 LEN_NAME;
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#define pci_unmap_addr(PTR, ADDR_NAME) \
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((PTR)->ADDR_NAME)
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#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \
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(((PTR)->ADDR_NAME) = (VAL))
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#define pci_unmap_len(PTR, LEN_NAME) \
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((PTR)->LEN_NAME)
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#define pci_unmap_len_set(PTR, LEN_NAME, VAL) \
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(((PTR)->LEN_NAME) = (VAL))
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/*
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** Stuff declared in arch/parisc/kernel/pci.c
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*/
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extern struct pci_port_ops *pci_port;
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extern struct pci_bios_ops *pci_bios;
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extern int pci_post_reset_delay; /* delay after de-asserting #RESET */
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extern int pci_hba_count;
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extern struct pci_hba_data *parisc_pci_hba[];
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#ifdef CONFIG_PCI
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extern void pcibios_register_hba(struct pci_hba_data *);
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extern void pcibios_set_master(struct pci_dev *);
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#else
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extern inline void pcibios_register_hba(struct pci_hba_data *x)
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{
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}
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#endif
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/*
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* pcibios_assign_all_busses() is used in drivers/pci/pci.c:pci_do_scan_bus()
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* 0 == check if bridge is numbered before re-numbering.
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* 1 == pci_do_scan_bus() should automatically number all PCI-PCI bridges.
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*
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* We *should* set this to zero for "legacy" platforms and one
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* for PAT platforms.
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*
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* But legacy platforms also need to renumber the busses below a Host
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* Bus controller. Adding a 4-port Tulip card on the first PCI root
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* bus of a C200 resulted in the secondary bus being numbered as 1.
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* The second PCI host bus controller's root bus had already been
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* assigned bus number 1 by firmware and sysfs complained.
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*
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* Firmware isn't doing anything wrong here since each controller
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* is its own PCI domain. It's simpler and easier for us to renumber
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* the busses rather than treat each Dino as a separate PCI domain.
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* Eventually, we may want to introduce PCI domains for Superdome or
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* rp7420/8420 boxes and then revisit this issue.
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*/
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#define pcibios_assign_all_busses() (1)
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#define pcibios_scan_all_fns(a, b) (0)
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#define PCIBIOS_MIN_IO 0x10
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#define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */
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/* Don't support DAC yet. */
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#define pci_dac_dma_supported(pci_dev, mask) (0)
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/* export the pci_ DMA API in terms of the dma_ one */
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#include <asm-generic/pci-dma-compat.h>
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static inline void pci_dma_burst_advice(struct pci_dev *pdev,
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enum pci_dma_burst_strategy *strat,
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unsigned long *strategy_parameter)
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{
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unsigned long cacheline_size;
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u8 byte;
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pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte);
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if (byte == 0)
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cacheline_size = 1024;
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else
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cacheline_size = (int) byte * 4;
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*strat = PCI_DMA_BURST_MULTIPLE;
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*strategy_parameter = cacheline_size;
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}
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extern void
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pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
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struct resource *res);
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static inline void pcibios_add_platform_entries(struct pci_dev *dev)
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{
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}
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#endif /* __ASM_PARISC_PCI_H */
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