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4a0d3f3afd
On 32bits boxes, boundary_size becomes zero due to a overflow and we hit BUG_ON in iommu_is_span_boundary. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Kyle McMartin <kyle@parisc-linux.org> Cc: Matthew Wilcox <matthew@wil.cx> Acked-by: Grant Grundler <grundler@parisc-linux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1610 lines
48 KiB
C
1610 lines
48 KiB
C
/*
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** ccio-dma.c:
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** DMA management routines for first generation cache-coherent machines.
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** Program U2/Uturn in "Virtual Mode" and use the I/O MMU.
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**
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** (c) Copyright 2000 Grant Grundler
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** (c) Copyright 2000 Ryan Bradetich
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** (c) Copyright 2000 Hewlett-Packard Company
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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**
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** "Real Mode" operation refers to U2/Uturn chip operation.
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** U2/Uturn were designed to perform coherency checks w/o using
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** the I/O MMU - basically what x86 does.
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**
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** Philipp Rumpf has a "Real Mode" driver for PCX-W machines at:
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** CVSROOT=:pserver:anonymous@198.186.203.37:/cvsroot/linux-parisc
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** cvs -z3 co linux/arch/parisc/kernel/dma-rm.c
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**
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** I've rewritten his code to work under TPG's tree. See ccio-rm-dma.c.
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**
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** Drawbacks of using Real Mode are:
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** o outbound DMA is slower - U2 won't prefetch data (GSC+ XQL signal).
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** o Inbound DMA less efficient - U2 can't use DMA_FAST attribute.
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** o Ability to do scatter/gather in HW is lost.
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** o Doesn't work under PCX-U/U+ machines since they didn't follow
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** the coherency design originally worked out. Only PCX-W does.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <linux/reboot.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/scatterlist.h>
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#include <linux/iommu-helper.h>
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#include <asm/byteorder.h>
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#include <asm/cache.h> /* for L1_CACHE_BYTES */
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/hardware.h> /* for register_module() */
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#include <asm/parisc-device.h>
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/*
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** Choose "ccio" since that's what HP-UX calls it.
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** Make it easier for folks to migrate from one to the other :^)
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*/
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#define MODULE_NAME "ccio"
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#undef DEBUG_CCIO_RES
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#undef DEBUG_CCIO_RUN
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#undef DEBUG_CCIO_INIT
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#undef DEBUG_CCIO_RUN_SG
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#ifdef CONFIG_PROC_FS
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/*
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* CCIO_SEARCH_TIME can help measure how fast the bitmap search is.
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* impacts performance though - ditch it if you don't use it.
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*/
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#define CCIO_SEARCH_TIME
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#undef CCIO_MAP_STATS
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#else
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#undef CCIO_SEARCH_TIME
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#undef CCIO_MAP_STATS
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#endif
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#include <linux/proc_fs.h>
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#include <asm/runway.h> /* for proc_runway_root */
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#ifdef DEBUG_CCIO_INIT
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#define DBG_INIT(x...) printk(x)
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#else
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#define DBG_INIT(x...)
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#endif
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#ifdef DEBUG_CCIO_RUN
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#define DBG_RUN(x...) printk(x)
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#else
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#define DBG_RUN(x...)
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#endif
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#ifdef DEBUG_CCIO_RES
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#define DBG_RES(x...) printk(x)
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#else
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#define DBG_RES(x...)
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#endif
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#ifdef DEBUG_CCIO_RUN_SG
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#define DBG_RUN_SG(x...) printk(x)
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#else
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#define DBG_RUN_SG(x...)
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#endif
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#define CCIO_INLINE inline
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#define WRITE_U32(value, addr) __raw_writel(value, addr)
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#define READ_U32(addr) __raw_readl(addr)
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#define U2_IOA_RUNWAY 0x580
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#define U2_BC_GSC 0x501
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#define UTURN_IOA_RUNWAY 0x581
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#define UTURN_BC_GSC 0x502
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#define IOA_NORMAL_MODE 0x00020080 /* IO_CONTROL to turn on CCIO */
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#define CMD_TLB_DIRECT_WRITE 35 /* IO_COMMAND for I/O TLB Writes */
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#define CMD_TLB_PURGE 33 /* IO_COMMAND to Purge I/O TLB entry */
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struct ioa_registers {
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/* Runway Supervisory Set */
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int32_t unused1[12];
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uint32_t io_command; /* Offset 12 */
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uint32_t io_status; /* Offset 13 */
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uint32_t io_control; /* Offset 14 */
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int32_t unused2[1];
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/* Runway Auxiliary Register Set */
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uint32_t io_err_resp; /* Offset 0 */
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uint32_t io_err_info; /* Offset 1 */
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uint32_t io_err_req; /* Offset 2 */
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uint32_t io_err_resp_hi; /* Offset 3 */
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uint32_t io_tlb_entry_m; /* Offset 4 */
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uint32_t io_tlb_entry_l; /* Offset 5 */
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uint32_t unused3[1];
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uint32_t io_pdir_base; /* Offset 7 */
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uint32_t io_io_low_hv; /* Offset 8 */
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uint32_t io_io_high_hv; /* Offset 9 */
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uint32_t unused4[1];
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uint32_t io_chain_id_mask; /* Offset 11 */
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uint32_t unused5[2];
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uint32_t io_io_low; /* Offset 14 */
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uint32_t io_io_high; /* Offset 15 */
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};
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/*
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** IOA Registers
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** -------------
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**
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** Runway IO_CONTROL Register (+0x38)
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**
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** The Runway IO_CONTROL register controls the forwarding of transactions.
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**
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** | 0 ... 13 | 14 15 | 16 ... 21 | 22 | 23 24 | 25 ... 31 |
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** | HV | TLB | reserved | HV | mode | reserved |
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**
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** o mode field indicates the address translation of transactions
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** forwarded from Runway to GSC+:
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** Mode Name Value Definition
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** Off (default) 0 Opaque to matching addresses.
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** Include 1 Transparent for matching addresses.
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** Peek 3 Map matching addresses.
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**
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** + "Off" mode: Runway transactions which match the I/O range
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** specified by the IO_IO_LOW/IO_IO_HIGH registers will be ignored.
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** + "Include" mode: all addresses within the I/O range specified
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** by the IO_IO_LOW and IO_IO_HIGH registers are transparently
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** forwarded. This is the I/O Adapter's normal operating mode.
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** + "Peek" mode: used during system configuration to initialize the
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** GSC+ bus. Runway Write_Shorts in the address range specified by
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** IO_IO_LOW and IO_IO_HIGH are forwarded through the I/O Adapter
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** *AND* the GSC+ address is remapped to the Broadcast Physical
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** Address space by setting the 14 high order address bits of the
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** 32 bit GSC+ address to ones.
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**
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** o TLB field affects transactions which are forwarded from GSC+ to Runway.
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** "Real" mode is the poweron default.
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**
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** TLB Mode Value Description
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** Real 0 No TLB translation. Address is directly mapped and the
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** virtual address is composed of selected physical bits.
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** Error 1 Software fills the TLB manually.
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** Normal 2 IOA fetches IO TLB misses from IO PDIR (in host memory).
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**
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**
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** IO_IO_LOW_HV +0x60 (HV dependent)
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** IO_IO_HIGH_HV +0x64 (HV dependent)
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** IO_IO_LOW +0x78 (Architected register)
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** IO_IO_HIGH +0x7c (Architected register)
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**
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** IO_IO_LOW and IO_IO_HIGH set the lower and upper bounds of the
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** I/O Adapter address space, respectively.
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**
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** 0 ... 7 | 8 ... 15 | 16 ... 31 |
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** 11111111 | 11111111 | address |
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**
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** Each LOW/HIGH pair describes a disjoint address space region.
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** (2 per GSC+ port). Each incoming Runway transaction address is compared
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** with both sets of LOW/HIGH registers. If the address is in the range
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** greater than or equal to IO_IO_LOW and less than IO_IO_HIGH the transaction
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** for forwarded to the respective GSC+ bus.
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** Specify IO_IO_LOW equal to or greater than IO_IO_HIGH to avoid specifying
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** an address space region.
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**
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** In order for a Runway address to reside within GSC+ extended address space:
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** Runway Address [0:7] must identically compare to 8'b11111111
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** Runway Address [8:11] must be equal to IO_IO_LOW(_HV)[16:19]
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** Runway Address [12:23] must be greater than or equal to
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** IO_IO_LOW(_HV)[20:31] and less than IO_IO_HIGH(_HV)[20:31].
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** Runway Address [24:39] is not used in the comparison.
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**
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** When the Runway transaction is forwarded to GSC+, the GSC+ address is
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** as follows:
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** GSC+ Address[0:3] 4'b1111
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** GSC+ Address[4:29] Runway Address[12:37]
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** GSC+ Address[30:31] 2'b00
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**
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** All 4 Low/High registers must be initialized (by PDC) once the lower bus
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** is interrogated and address space is defined. The operating system will
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** modify the architectural IO_IO_LOW and IO_IO_HIGH registers following
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** the PDC initialization. However, the hardware version dependent IO_IO_LOW
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** and IO_IO_HIGH registers should not be subsequently altered by the OS.
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**
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** Writes to both sets of registers will take effect immediately, bypassing
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** the queues, which ensures that subsequent Runway transactions are checked
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** against the updated bounds values. However reads are queued, introducing
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** the possibility of a read being bypassed by a subsequent write to the same
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** register. This sequence can be avoided by having software wait for read
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** returns before issuing subsequent writes.
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*/
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struct ioc {
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struct ioa_registers __iomem *ioc_regs; /* I/O MMU base address */
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u8 *res_map; /* resource map, bit == pdir entry */
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u64 *pdir_base; /* physical base address */
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u32 pdir_size; /* bytes, function of IOV Space size */
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u32 res_hint; /* next available IOVP -
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circular search */
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u32 res_size; /* size of resource map in bytes */
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spinlock_t res_lock;
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#ifdef CCIO_SEARCH_TIME
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#define CCIO_SEARCH_SAMPLE 0x100
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unsigned long avg_search[CCIO_SEARCH_SAMPLE];
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unsigned long avg_idx; /* current index into avg_search */
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#endif
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#ifdef CCIO_MAP_STATS
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unsigned long used_pages;
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unsigned long msingle_calls;
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unsigned long msingle_pages;
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unsigned long msg_calls;
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unsigned long msg_pages;
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unsigned long usingle_calls;
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unsigned long usingle_pages;
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unsigned long usg_calls;
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unsigned long usg_pages;
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#endif
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unsigned short cujo20_bug;
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/* STUFF We don't need in performance path */
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u32 chainid_shift; /* specify bit location of chain_id */
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struct ioc *next; /* Linked list of discovered iocs */
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const char *name; /* device name from firmware */
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unsigned int hw_path; /* the hardware path this ioc is associatd with */
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struct pci_dev *fake_pci_dev; /* the fake pci_dev for non-pci devs */
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struct resource mmio_region[2]; /* The "routed" MMIO regions */
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};
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static struct ioc *ioc_list;
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static int ioc_count;
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/**************************************************************
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*
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* I/O Pdir Resource Management
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*
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* Bits set in the resource map are in use.
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* Each bit can represent a number of pages.
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* LSbs represent lower addresses (IOVA's).
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*
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* This was was copied from sba_iommu.c. Don't try to unify
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* the two resource managers unless a way to have different
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* allocation policies is also adjusted. We'd like to avoid
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* I/O TLB thrashing by having resource allocation policy
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* match the I/O TLB replacement policy.
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*
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***************************************************************/
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#define IOVP_SIZE PAGE_SIZE
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#define IOVP_SHIFT PAGE_SHIFT
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#define IOVP_MASK PAGE_MASK
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/* Convert from IOVP to IOVA and vice versa. */
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#define CCIO_IOVA(iovp,offset) ((iovp) | (offset))
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#define CCIO_IOVP(iova) ((iova) & IOVP_MASK)
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#define PDIR_INDEX(iovp) ((iovp)>>IOVP_SHIFT)
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#define MKIOVP(pdir_idx) ((long)(pdir_idx) << IOVP_SHIFT)
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#define MKIOVA(iovp,offset) (dma_addr_t)((long)iovp | (long)offset)
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/*
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** Don't worry about the 150% average search length on a miss.
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** If the search wraps around, and passes the res_hint, it will
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** cause the kernel to panic anyhow.
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*/
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#define CCIO_SEARCH_LOOP(ioc, res_idx, mask, size) \
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for(; res_ptr < res_end; ++res_ptr) { \
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int ret;\
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unsigned int idx;\
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idx = (unsigned int)((unsigned long)res_ptr - (unsigned long)ioc->res_map); \
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ret = iommu_is_span_boundary(idx << 3, pages_needed, 0, boundary_size);\
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if ((0 == (*res_ptr & mask)) && !ret) { \
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*res_ptr |= mask; \
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res_idx = idx;\
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ioc->res_hint = res_idx + (size >> 3); \
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goto resource_found; \
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} \
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}
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#define CCIO_FIND_FREE_MAPPING(ioa, res_idx, mask, size) \
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u##size *res_ptr = (u##size *)&((ioc)->res_map[ioa->res_hint & ~((size >> 3) - 1)]); \
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u##size *res_end = (u##size *)&(ioc)->res_map[ioa->res_size]; \
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CCIO_SEARCH_LOOP(ioc, res_idx, mask, size); \
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res_ptr = (u##size *)&(ioc)->res_map[0]; \
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CCIO_SEARCH_LOOP(ioa, res_idx, mask, size);
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/*
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** Find available bit in this ioa's resource map.
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** Use a "circular" search:
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** o Most IOVA's are "temporary" - avg search time should be small.
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** o keep a history of what happened for debugging
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** o KISS.
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**
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** Perf optimizations:
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** o search for log2(size) bits at a time.
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** o search for available resource bits using byte/word/whatever.
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** o use different search for "large" (eg > 4 pages) or "very large"
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** (eg > 16 pages) mappings.
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*/
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/**
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* ccio_alloc_range - Allocate pages in the ioc's resource map.
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* @ioc: The I/O Controller.
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* @pages_needed: The requested number of pages to be mapped into the
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* I/O Pdir...
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*
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* This function searches the resource map of the ioc to locate a range
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* of available pages for the requested size.
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*/
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static int
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ccio_alloc_range(struct ioc *ioc, struct device *dev, size_t size)
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{
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unsigned int pages_needed = size >> IOVP_SHIFT;
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unsigned int res_idx;
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unsigned long boundary_size;
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#ifdef CCIO_SEARCH_TIME
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unsigned long cr_start = mfctl(16);
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#endif
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BUG_ON(pages_needed == 0);
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BUG_ON((pages_needed * IOVP_SIZE) > DMA_CHUNK_SIZE);
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DBG_RES("%s() size: %d pages_needed %d\n",
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__FUNCTION__, size, pages_needed);
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/*
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** "seek and ye shall find"...praying never hurts either...
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** ggg sacrifices another 710 to the computer gods.
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*/
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boundary_size = ALIGN((unsigned long long)dma_get_seg_boundary(dev) + 1,
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1ULL << IOVP_SHIFT) >> IOVP_SHIFT;
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if (pages_needed <= 8) {
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/*
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* LAN traffic will not thrash the TLB IFF the same NIC
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* uses 8 adjacent pages to map separate payload data.
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* ie the same byte in the resource bit map.
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*/
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#if 0
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/* FIXME: bit search should shift it's way through
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* an unsigned long - not byte at a time. As it is now,
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* we effectively allocate this byte to this mapping.
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*/
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unsigned long mask = ~(~0UL >> pages_needed);
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CCIO_FIND_FREE_MAPPING(ioc, res_idx, mask, 8);
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#else
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CCIO_FIND_FREE_MAPPING(ioc, res_idx, 0xff, 8);
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#endif
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} else if (pages_needed <= 16) {
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CCIO_FIND_FREE_MAPPING(ioc, res_idx, 0xffff, 16);
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} else if (pages_needed <= 32) {
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CCIO_FIND_FREE_MAPPING(ioc, res_idx, ~(unsigned int)0, 32);
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#ifdef __LP64__
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} else if (pages_needed <= 64) {
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CCIO_FIND_FREE_MAPPING(ioc, res_idx, ~0UL, 64);
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#endif
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} else {
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panic("%s: %s() Too many pages to map. pages_needed: %u\n",
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__FILE__, __FUNCTION__, pages_needed);
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}
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panic("%s: %s() I/O MMU is out of mapping resources.\n", __FILE__,
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__FUNCTION__);
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resource_found:
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DBG_RES("%s() res_idx %d res_hint: %d\n",
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__FUNCTION__, res_idx, ioc->res_hint);
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#ifdef CCIO_SEARCH_TIME
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{
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unsigned long cr_end = mfctl(16);
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unsigned long tmp = cr_end - cr_start;
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/* check for roll over */
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cr_start = (cr_end < cr_start) ? -(tmp) : (tmp);
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}
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ioc->avg_search[ioc->avg_idx++] = cr_start;
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ioc->avg_idx &= CCIO_SEARCH_SAMPLE - 1;
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#endif
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#ifdef CCIO_MAP_STATS
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ioc->used_pages += pages_needed;
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#endif
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/*
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** return the bit address.
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*/
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return res_idx << 3;
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}
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#define CCIO_FREE_MAPPINGS(ioc, res_idx, mask, size) \
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u##size *res_ptr = (u##size *)&((ioc)->res_map[res_idx]); \
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BUG_ON((*res_ptr & mask) != mask); \
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*res_ptr &= ~(mask);
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/**
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* ccio_free_range - Free pages from the ioc's resource map.
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* @ioc: The I/O Controller.
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* @iova: The I/O Virtual Address.
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* @pages_mapped: The requested number of pages to be freed from the
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* I/O Pdir.
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*
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* This function frees the resouces allocated for the iova.
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*/
|
|
static void
|
|
ccio_free_range(struct ioc *ioc, dma_addr_t iova, unsigned long pages_mapped)
|
|
{
|
|
unsigned long iovp = CCIO_IOVP(iova);
|
|
unsigned int res_idx = PDIR_INDEX(iovp) >> 3;
|
|
|
|
BUG_ON(pages_mapped == 0);
|
|
BUG_ON((pages_mapped * IOVP_SIZE) > DMA_CHUNK_SIZE);
|
|
BUG_ON(pages_mapped > BITS_PER_LONG);
|
|
|
|
DBG_RES("%s(): res_idx: %d pages_mapped %d\n",
|
|
__FUNCTION__, res_idx, pages_mapped);
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
ioc->used_pages -= pages_mapped;
|
|
#endif
|
|
|
|
if(pages_mapped <= 8) {
|
|
#if 0
|
|
/* see matching comments in alloc_range */
|
|
unsigned long mask = ~(~0UL >> pages_mapped);
|
|
CCIO_FREE_MAPPINGS(ioc, res_idx, mask, 8);
|
|
#else
|
|
CCIO_FREE_MAPPINGS(ioc, res_idx, 0xff, 8);
|
|
#endif
|
|
} else if(pages_mapped <= 16) {
|
|
CCIO_FREE_MAPPINGS(ioc, res_idx, 0xffff, 16);
|
|
} else if(pages_mapped <= 32) {
|
|
CCIO_FREE_MAPPINGS(ioc, res_idx, ~(unsigned int)0, 32);
|
|
#ifdef __LP64__
|
|
} else if(pages_mapped <= 64) {
|
|
CCIO_FREE_MAPPINGS(ioc, res_idx, ~0UL, 64);
|
|
#endif
|
|
} else {
|
|
panic("%s:%s() Too many pages to unmap.\n", __FILE__,
|
|
__FUNCTION__);
|
|
}
|
|
}
|
|
|
|
/****************************************************************
|
|
**
|
|
** CCIO dma_ops support routines
|
|
**
|
|
*****************************************************************/
|
|
|
|
typedef unsigned long space_t;
|
|
#define KERNEL_SPACE 0
|
|
|
|
/*
|
|
** DMA "Page Type" and Hints
|
|
** o if SAFE_DMA isn't set, mapping is for FAST_DMA. SAFE_DMA should be
|
|
** set for subcacheline DMA transfers since we don't want to damage the
|
|
** other part of a cacheline.
|
|
** o SAFE_DMA must be set for "memory" allocated via pci_alloc_consistent().
|
|
** This bit tells U2 to do R/M/W for partial cachelines. "Streaming"
|
|
** data can avoid this if the mapping covers full cache lines.
|
|
** o STOP_MOST is needed for atomicity across cachelines.
|
|
** Apparently only "some EISA devices" need this.
|
|
** Using CONFIG_ISA is hack. Only the IOA with EISA under it needs
|
|
** to use this hint iff the EISA devices needs this feature.
|
|
** According to the U2 ERS, STOP_MOST enabled pages hurt performance.
|
|
** o PREFETCH should *not* be set for cases like Multiple PCI devices
|
|
** behind GSCtoPCI (dino) bus converter. Only one cacheline per GSC
|
|
** device can be fetched and multiply DMA streams will thrash the
|
|
** prefetch buffer and burn memory bandwidth. See 6.7.3 "Prefetch Rules
|
|
** and Invalidation of Prefetch Entries".
|
|
**
|
|
** FIXME: the default hints need to be per GSC device - not global.
|
|
**
|
|
** HP-UX dorks: linux device driver programming model is totally different
|
|
** than HP-UX's. HP-UX always sets HINT_PREFETCH since it's drivers
|
|
** do special things to work on non-coherent platforms...linux has to
|
|
** be much more careful with this.
|
|
*/
|
|
#define IOPDIR_VALID 0x01UL
|
|
#define HINT_SAFE_DMA 0x02UL /* used for pci_alloc_consistent() pages */
|
|
#ifdef CONFIG_EISA
|
|
#define HINT_STOP_MOST 0x04UL /* LSL support */
|
|
#else
|
|
#define HINT_STOP_MOST 0x00UL /* only needed for "some EISA devices" */
|
|
#endif
|
|
#define HINT_UDPATE_ENB 0x08UL /* not used/supported by U2 */
|
|
#define HINT_PREFETCH 0x10UL /* for outbound pages which are not SAFE */
|
|
|
|
|
|
/*
|
|
** Use direction (ie PCI_DMA_TODEVICE) to pick hint.
|
|
** ccio_alloc_consistent() depends on this to get SAFE_DMA
|
|
** when it passes in BIDIRECTIONAL flag.
|
|
*/
|
|
static u32 hint_lookup[] = {
|
|
[PCI_DMA_BIDIRECTIONAL] = HINT_STOP_MOST | HINT_SAFE_DMA | IOPDIR_VALID,
|
|
[PCI_DMA_TODEVICE] = HINT_STOP_MOST | HINT_PREFETCH | IOPDIR_VALID,
|
|
[PCI_DMA_FROMDEVICE] = HINT_STOP_MOST | IOPDIR_VALID,
|
|
};
|
|
|
|
/**
|
|
* ccio_io_pdir_entry - Initialize an I/O Pdir.
|
|
* @pdir_ptr: A pointer into I/O Pdir.
|
|
* @sid: The Space Identifier.
|
|
* @vba: The virtual address.
|
|
* @hints: The DMA Hint.
|
|
*
|
|
* Given a virtual address (vba, arg2) and space id, (sid, arg1),
|
|
* load the I/O PDIR entry pointed to by pdir_ptr (arg0). Each IO Pdir
|
|
* entry consists of 8 bytes as shown below (MSB == bit 0):
|
|
*
|
|
*
|
|
* WORD 0:
|
|
* +------+----------------+-----------------------------------------------+
|
|
* | Phys | Virtual Index | Phys |
|
|
* | 0:3 | 0:11 | 4:19 |
|
|
* |4 bits| 12 bits | 16 bits |
|
|
* +------+----------------+-----------------------------------------------+
|
|
* WORD 1:
|
|
* +-----------------------+-----------------------------------------------+
|
|
* | Phys | Rsvd | Prefetch |Update |Rsvd |Lock |Safe |Valid |
|
|
* | 20:39 | | Enable |Enable | |Enable|DMA | |
|
|
* | 20 bits | 5 bits | 1 bit |1 bit |2 bits|1 bit |1 bit |1 bit |
|
|
* +-----------------------+-----------------------------------------------+
|
|
*
|
|
* The virtual index field is filled with the results of the LCI
|
|
* (Load Coherence Index) instruction. The 8 bits used for the virtual
|
|
* index are bits 12:19 of the value returned by LCI.
|
|
*/
|
|
void CCIO_INLINE
|
|
ccio_io_pdir_entry(u64 *pdir_ptr, space_t sid, unsigned long vba,
|
|
unsigned long hints)
|
|
{
|
|
register unsigned long pa;
|
|
register unsigned long ci; /* coherent index */
|
|
|
|
/* We currently only support kernel addresses */
|
|
BUG_ON(sid != KERNEL_SPACE);
|
|
|
|
mtsp(sid,1);
|
|
|
|
/*
|
|
** WORD 1 - low order word
|
|
** "hints" parm includes the VALID bit!
|
|
** "dep" clobbers the physical address offset bits as well.
|
|
*/
|
|
pa = virt_to_phys(vba);
|
|
asm volatile("depw %1,31,12,%0" : "+r" (pa) : "r" (hints));
|
|
((u32 *)pdir_ptr)[1] = (u32) pa;
|
|
|
|
/*
|
|
** WORD 0 - high order word
|
|
*/
|
|
|
|
#ifdef __LP64__
|
|
/*
|
|
** get bits 12:15 of physical address
|
|
** shift bits 16:31 of physical address
|
|
** and deposit them
|
|
*/
|
|
asm volatile ("extrd,u %1,15,4,%0" : "=r" (ci) : "r" (pa));
|
|
asm volatile ("extrd,u %1,31,16,%0" : "+r" (pa) : "r" (pa));
|
|
asm volatile ("depd %1,35,4,%0" : "+r" (pa) : "r" (ci));
|
|
#else
|
|
pa = 0;
|
|
#endif
|
|
/*
|
|
** get CPU coherency index bits
|
|
** Grab virtual index [0:11]
|
|
** Deposit virt_idx bits into I/O PDIR word
|
|
*/
|
|
asm volatile ("lci %%r0(%%sr1, %1), %0" : "=r" (ci) : "r" (vba));
|
|
asm volatile ("extru %1,19,12,%0" : "+r" (ci) : "r" (ci));
|
|
asm volatile ("depw %1,15,12,%0" : "+r" (pa) : "r" (ci));
|
|
|
|
((u32 *)pdir_ptr)[0] = (u32) pa;
|
|
|
|
|
|
/* FIXME: PCX_W platforms don't need FDC/SYNC. (eg C360)
|
|
** PCX-U/U+ do. (eg C200/C240)
|
|
** PCX-T'? Don't know. (eg C110 or similar K-class)
|
|
**
|
|
** See PDC_MODEL/option 0/SW_CAP word for "Non-coherent IO-PDIR bit".
|
|
** Hopefully we can patch (NOP) these out at boot time somehow.
|
|
**
|
|
** "Since PCX-U employs an offset hash that is incompatible with
|
|
** the real mode coherence index generation of U2, the PDIR entry
|
|
** must be flushed to memory to retain coherence."
|
|
*/
|
|
asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
|
|
asm volatile("sync");
|
|
}
|
|
|
|
/**
|
|
* ccio_clear_io_tlb - Remove stale entries from the I/O TLB.
|
|
* @ioc: The I/O Controller.
|
|
* @iovp: The I/O Virtual Page.
|
|
* @byte_cnt: The requested number of bytes to be freed from the I/O Pdir.
|
|
*
|
|
* Purge invalid I/O PDIR entries from the I/O TLB.
|
|
*
|
|
* FIXME: Can we change the byte_cnt to pages_mapped?
|
|
*/
|
|
static CCIO_INLINE void
|
|
ccio_clear_io_tlb(struct ioc *ioc, dma_addr_t iovp, size_t byte_cnt)
|
|
{
|
|
u32 chain_size = 1 << ioc->chainid_shift;
|
|
|
|
iovp &= IOVP_MASK; /* clear offset bits, just want pagenum */
|
|
byte_cnt += chain_size;
|
|
|
|
while(byte_cnt > chain_size) {
|
|
WRITE_U32(CMD_TLB_PURGE | iovp, &ioc->ioc_regs->io_command);
|
|
iovp += chain_size;
|
|
byte_cnt -= chain_size;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ccio_mark_invalid - Mark the I/O Pdir entries invalid.
|
|
* @ioc: The I/O Controller.
|
|
* @iova: The I/O Virtual Address.
|
|
* @byte_cnt: The requested number of bytes to be freed from the I/O Pdir.
|
|
*
|
|
* Mark the I/O Pdir entries invalid and blow away the corresponding I/O
|
|
* TLB entries.
|
|
*
|
|
* FIXME: at some threshhold it might be "cheaper" to just blow
|
|
* away the entire I/O TLB instead of individual entries.
|
|
*
|
|
* FIXME: Uturn has 256 TLB entries. We don't need to purge every
|
|
* PDIR entry - just once for each possible TLB entry.
|
|
* (We do need to maker I/O PDIR entries invalid regardless).
|
|
*
|
|
* FIXME: Can we change byte_cnt to pages_mapped?
|
|
*/
|
|
static CCIO_INLINE void
|
|
ccio_mark_invalid(struct ioc *ioc, dma_addr_t iova, size_t byte_cnt)
|
|
{
|
|
u32 iovp = (u32)CCIO_IOVP(iova);
|
|
size_t saved_byte_cnt;
|
|
|
|
/* round up to nearest page size */
|
|
saved_byte_cnt = byte_cnt = ALIGN(byte_cnt, IOVP_SIZE);
|
|
|
|
while(byte_cnt > 0) {
|
|
/* invalidate one page at a time */
|
|
unsigned int idx = PDIR_INDEX(iovp);
|
|
char *pdir_ptr = (char *) &(ioc->pdir_base[idx]);
|
|
|
|
BUG_ON(idx >= (ioc->pdir_size / sizeof(u64)));
|
|
pdir_ptr[7] = 0; /* clear only VALID bit */
|
|
/*
|
|
** FIXME: PCX_W platforms don't need FDC/SYNC. (eg C360)
|
|
** PCX-U/U+ do. (eg C200/C240)
|
|
** See PDC_MODEL/option 0/SW_CAP for "Non-coherent IO-PDIR bit".
|
|
**
|
|
** Hopefully someone figures out how to patch (NOP) the
|
|
** FDC/SYNC out at boot time.
|
|
*/
|
|
asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr[7]));
|
|
|
|
iovp += IOVP_SIZE;
|
|
byte_cnt -= IOVP_SIZE;
|
|
}
|
|
|
|
asm volatile("sync");
|
|
ccio_clear_io_tlb(ioc, CCIO_IOVP(iova), saved_byte_cnt);
|
|
}
|
|
|
|
/****************************************************************
|
|
**
|
|
** CCIO dma_ops
|
|
**
|
|
*****************************************************************/
|
|
|
|
/**
|
|
* ccio_dma_supported - Verify the IOMMU supports the DMA address range.
|
|
* @dev: The PCI device.
|
|
* @mask: A bit mask describing the DMA address range of the device.
|
|
*
|
|
* This function implements the pci_dma_supported function.
|
|
*/
|
|
static int
|
|
ccio_dma_supported(struct device *dev, u64 mask)
|
|
{
|
|
if(dev == NULL) {
|
|
printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
|
|
BUG();
|
|
return 0;
|
|
}
|
|
|
|
/* only support 32-bit devices (ie PCI/GSC) */
|
|
return (int)(mask == 0xffffffffUL);
|
|
}
|
|
|
|
/**
|
|
* ccio_map_single - Map an address range into the IOMMU.
|
|
* @dev: The PCI device.
|
|
* @addr: The start address of the DMA region.
|
|
* @size: The length of the DMA region.
|
|
* @direction: The direction of the DMA transaction (to/from device).
|
|
*
|
|
* This function implements the pci_map_single function.
|
|
*/
|
|
static dma_addr_t
|
|
ccio_map_single(struct device *dev, void *addr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
int idx;
|
|
struct ioc *ioc;
|
|
unsigned long flags;
|
|
dma_addr_t iovp;
|
|
dma_addr_t offset;
|
|
u64 *pdir_start;
|
|
unsigned long hint = hint_lookup[(int)direction];
|
|
|
|
BUG_ON(!dev);
|
|
ioc = GET_IOC(dev);
|
|
|
|
BUG_ON(size <= 0);
|
|
|
|
/* save offset bits */
|
|
offset = ((unsigned long) addr) & ~IOVP_MASK;
|
|
|
|
/* round up to nearest IOVP_SIZE */
|
|
size = ALIGN(size + offset, IOVP_SIZE);
|
|
spin_lock_irqsave(&ioc->res_lock, flags);
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
ioc->msingle_calls++;
|
|
ioc->msingle_pages += size >> IOVP_SHIFT;
|
|
#endif
|
|
|
|
idx = ccio_alloc_range(ioc, dev, size);
|
|
iovp = (dma_addr_t)MKIOVP(idx);
|
|
|
|
pdir_start = &(ioc->pdir_base[idx]);
|
|
|
|
DBG_RUN("%s() 0x%p -> 0x%lx size: %0x%x\n",
|
|
__FUNCTION__, addr, (long)iovp | offset, size);
|
|
|
|
/* If not cacheline aligned, force SAFE_DMA on the whole mess */
|
|
if((size % L1_CACHE_BYTES) || ((unsigned long)addr % L1_CACHE_BYTES))
|
|
hint |= HINT_SAFE_DMA;
|
|
|
|
while(size > 0) {
|
|
ccio_io_pdir_entry(pdir_start, KERNEL_SPACE, (unsigned long)addr, hint);
|
|
|
|
DBG_RUN(" pdir %p %08x%08x\n",
|
|
pdir_start,
|
|
(u32) (((u32 *) pdir_start)[0]),
|
|
(u32) (((u32 *) pdir_start)[1]));
|
|
++pdir_start;
|
|
addr += IOVP_SIZE;
|
|
size -= IOVP_SIZE;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ioc->res_lock, flags);
|
|
|
|
/* form complete address */
|
|
return CCIO_IOVA(iovp, offset);
|
|
}
|
|
|
|
/**
|
|
* ccio_unmap_single - Unmap an address range from the IOMMU.
|
|
* @dev: The PCI device.
|
|
* @addr: The start address of the DMA region.
|
|
* @size: The length of the DMA region.
|
|
* @direction: The direction of the DMA transaction (to/from device).
|
|
*
|
|
* This function implements the pci_unmap_single function.
|
|
*/
|
|
static void
|
|
ccio_unmap_single(struct device *dev, dma_addr_t iova, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct ioc *ioc;
|
|
unsigned long flags;
|
|
dma_addr_t offset = iova & ~IOVP_MASK;
|
|
|
|
BUG_ON(!dev);
|
|
ioc = GET_IOC(dev);
|
|
|
|
DBG_RUN("%s() iovp 0x%lx/%x\n",
|
|
__FUNCTION__, (long)iova, size);
|
|
|
|
iova ^= offset; /* clear offset bits */
|
|
size += offset;
|
|
size = ALIGN(size, IOVP_SIZE);
|
|
|
|
spin_lock_irqsave(&ioc->res_lock, flags);
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
ioc->usingle_calls++;
|
|
ioc->usingle_pages += size >> IOVP_SHIFT;
|
|
#endif
|
|
|
|
ccio_mark_invalid(ioc, iova, size);
|
|
ccio_free_range(ioc, iova, (size >> IOVP_SHIFT));
|
|
spin_unlock_irqrestore(&ioc->res_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* ccio_alloc_consistent - Allocate a consistent DMA mapping.
|
|
* @dev: The PCI device.
|
|
* @size: The length of the DMA region.
|
|
* @dma_handle: The DMA address handed back to the device (not the cpu).
|
|
*
|
|
* This function implements the pci_alloc_consistent function.
|
|
*/
|
|
static void *
|
|
ccio_alloc_consistent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag)
|
|
{
|
|
void *ret;
|
|
#if 0
|
|
/* GRANT Need to establish hierarchy for non-PCI devs as well
|
|
** and then provide matching gsc_map_xxx() functions for them as well.
|
|
*/
|
|
if(!hwdev) {
|
|
/* only support PCI */
|
|
*dma_handle = 0;
|
|
return 0;
|
|
}
|
|
#endif
|
|
ret = (void *) __get_free_pages(flag, get_order(size));
|
|
|
|
if (ret) {
|
|
memset(ret, 0, size);
|
|
*dma_handle = ccio_map_single(dev, ret, size, PCI_DMA_BIDIRECTIONAL);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ccio_free_consistent - Free a consistent DMA mapping.
|
|
* @dev: The PCI device.
|
|
* @size: The length of the DMA region.
|
|
* @cpu_addr: The cpu address returned from the ccio_alloc_consistent.
|
|
* @dma_handle: The device address returned from the ccio_alloc_consistent.
|
|
*
|
|
* This function implements the pci_free_consistent function.
|
|
*/
|
|
static void
|
|
ccio_free_consistent(struct device *dev, size_t size, void *cpu_addr,
|
|
dma_addr_t dma_handle)
|
|
{
|
|
ccio_unmap_single(dev, dma_handle, size, 0);
|
|
free_pages((unsigned long)cpu_addr, get_order(size));
|
|
}
|
|
|
|
/*
|
|
** Since 0 is a valid pdir_base index value, can't use that
|
|
** to determine if a value is valid or not. Use a flag to indicate
|
|
** the SG list entry contains a valid pdir index.
|
|
*/
|
|
#define PIDE_FLAG 0x80000000UL
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
#define IOMMU_MAP_STATS
|
|
#endif
|
|
#include "iommu-helpers.h"
|
|
|
|
/**
|
|
* ccio_map_sg - Map the scatter/gather list into the IOMMU.
|
|
* @dev: The PCI device.
|
|
* @sglist: The scatter/gather list to be mapped in the IOMMU.
|
|
* @nents: The number of entries in the scatter/gather list.
|
|
* @direction: The direction of the DMA transaction (to/from device).
|
|
*
|
|
* This function implements the pci_map_sg function.
|
|
*/
|
|
static int
|
|
ccio_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct ioc *ioc;
|
|
int coalesced, filled = 0;
|
|
unsigned long flags;
|
|
unsigned long hint = hint_lookup[(int)direction];
|
|
unsigned long prev_len = 0, current_len = 0;
|
|
int i;
|
|
|
|
BUG_ON(!dev);
|
|
ioc = GET_IOC(dev);
|
|
|
|
DBG_RUN_SG("%s() START %d entries\n", __FUNCTION__, nents);
|
|
|
|
/* Fast path single entry scatterlists. */
|
|
if (nents == 1) {
|
|
sg_dma_address(sglist) = ccio_map_single(dev,
|
|
(void *)sg_virt_addr(sglist), sglist->length,
|
|
direction);
|
|
sg_dma_len(sglist) = sglist->length;
|
|
return 1;
|
|
}
|
|
|
|
for(i = 0; i < nents; i++)
|
|
prev_len += sglist[i].length;
|
|
|
|
spin_lock_irqsave(&ioc->res_lock, flags);
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
ioc->msg_calls++;
|
|
#endif
|
|
|
|
/*
|
|
** First coalesce the chunks and allocate I/O pdir space
|
|
**
|
|
** If this is one DMA stream, we can properly map using the
|
|
** correct virtual address associated with each DMA page.
|
|
** w/o this association, we wouldn't have coherent DMA!
|
|
** Access to the virtual address is what forces a two pass algorithm.
|
|
*/
|
|
coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, ccio_alloc_range);
|
|
|
|
/*
|
|
** Program the I/O Pdir
|
|
**
|
|
** map the virtual addresses to the I/O Pdir
|
|
** o dma_address will contain the pdir index
|
|
** o dma_len will contain the number of bytes to map
|
|
** o page/offset contain the virtual address.
|
|
*/
|
|
filled = iommu_fill_pdir(ioc, sglist, nents, hint, ccio_io_pdir_entry);
|
|
|
|
spin_unlock_irqrestore(&ioc->res_lock, flags);
|
|
|
|
BUG_ON(coalesced != filled);
|
|
|
|
DBG_RUN_SG("%s() DONE %d mappings\n", __FUNCTION__, filled);
|
|
|
|
for (i = 0; i < filled; i++)
|
|
current_len += sg_dma_len(sglist + i);
|
|
|
|
BUG_ON(current_len != prev_len);
|
|
|
|
return filled;
|
|
}
|
|
|
|
/**
|
|
* ccio_unmap_sg - Unmap the scatter/gather list from the IOMMU.
|
|
* @dev: The PCI device.
|
|
* @sglist: The scatter/gather list to be unmapped from the IOMMU.
|
|
* @nents: The number of entries in the scatter/gather list.
|
|
* @direction: The direction of the DMA transaction (to/from device).
|
|
*
|
|
* This function implements the pci_unmap_sg function.
|
|
*/
|
|
static void
|
|
ccio_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct ioc *ioc;
|
|
|
|
BUG_ON(!dev);
|
|
ioc = GET_IOC(dev);
|
|
|
|
DBG_RUN_SG("%s() START %d entries, %08lx,%x\n",
|
|
__FUNCTION__, nents, sg_virt_addr(sglist), sglist->length);
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
ioc->usg_calls++;
|
|
#endif
|
|
|
|
while(sg_dma_len(sglist) && nents--) {
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
ioc->usg_pages += sg_dma_len(sglist) >> PAGE_SHIFT;
|
|
#endif
|
|
ccio_unmap_single(dev, sg_dma_address(sglist),
|
|
sg_dma_len(sglist), direction);
|
|
++sglist;
|
|
}
|
|
|
|
DBG_RUN_SG("%s() DONE (nents %d)\n", __FUNCTION__, nents);
|
|
}
|
|
|
|
static struct hppa_dma_ops ccio_ops = {
|
|
.dma_supported = ccio_dma_supported,
|
|
.alloc_consistent = ccio_alloc_consistent,
|
|
.alloc_noncoherent = ccio_alloc_consistent,
|
|
.free_consistent = ccio_free_consistent,
|
|
.map_single = ccio_map_single,
|
|
.unmap_single = ccio_unmap_single,
|
|
.map_sg = ccio_map_sg,
|
|
.unmap_sg = ccio_unmap_sg,
|
|
.dma_sync_single_for_cpu = NULL, /* NOP for U2/Uturn */
|
|
.dma_sync_single_for_device = NULL, /* NOP for U2/Uturn */
|
|
.dma_sync_sg_for_cpu = NULL, /* ditto */
|
|
.dma_sync_sg_for_device = NULL, /* ditto */
|
|
};
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int ccio_proc_info(struct seq_file *m, void *p)
|
|
{
|
|
int len = 0;
|
|
struct ioc *ioc = ioc_list;
|
|
|
|
while (ioc != NULL) {
|
|
unsigned int total_pages = ioc->res_size << 3;
|
|
unsigned long avg = 0, min, max;
|
|
int j;
|
|
|
|
len += seq_printf(m, "%s\n", ioc->name);
|
|
|
|
len += seq_printf(m, "Cujo 2.0 bug : %s\n",
|
|
(ioc->cujo20_bug ? "yes" : "no"));
|
|
|
|
len += seq_printf(m, "IO PDIR size : %d bytes (%d entries)\n",
|
|
total_pages * 8, total_pages);
|
|
|
|
#ifdef CCIO_MAP_STATS
|
|
len += seq_printf(m, "IO PDIR entries : %ld free %ld used (%d%%)\n",
|
|
total_pages - ioc->used_pages, ioc->used_pages,
|
|
(int)(ioc->used_pages * 100 / total_pages));
|
|
#endif
|
|
|
|
len += seq_printf(m, "Resource bitmap : %d bytes (%d pages)\n",
|
|
ioc->res_size, total_pages);
|
|
|
|
#ifdef CCIO_SEARCH_TIME
|
|
min = max = ioc->avg_search[0];
|
|
for(j = 0; j < CCIO_SEARCH_SAMPLE; ++j) {
|
|
avg += ioc->avg_search[j];
|
|
if(ioc->avg_search[j] > max)
|
|
max = ioc->avg_search[j];
|
|
if(ioc->avg_search[j] < min)
|
|
min = ioc->avg_search[j];
|
|
}
|
|
avg /= CCIO_SEARCH_SAMPLE;
|
|
len += seq_printf(m, " Bitmap search : %ld/%ld/%ld (min/avg/max CPU Cycles)\n",
|
|
min, avg, max);
|
|
#endif
|
|
#ifdef CCIO_MAP_STATS
|
|
len += seq_printf(m, "pci_map_single(): %8ld calls %8ld pages (avg %d/1000)\n",
|
|
ioc->msingle_calls, ioc->msingle_pages,
|
|
(int)((ioc->msingle_pages * 1000)/ioc->msingle_calls));
|
|
|
|
/* KLUGE - unmap_sg calls unmap_single for each mapped page */
|
|
min = ioc->usingle_calls - ioc->usg_calls;
|
|
max = ioc->usingle_pages - ioc->usg_pages;
|
|
len += seq_printf(m, "pci_unmap_single: %8ld calls %8ld pages (avg %d/1000)\n",
|
|
min, max, (int)((max * 1000)/min));
|
|
|
|
len += seq_printf(m, "pci_map_sg() : %8ld calls %8ld pages (avg %d/1000)\n",
|
|
ioc->msg_calls, ioc->msg_pages,
|
|
(int)((ioc->msg_pages * 1000)/ioc->msg_calls));
|
|
|
|
len += seq_printf(m, "pci_unmap_sg() : %8ld calls %8ld pages (avg %d/1000)\n\n\n",
|
|
ioc->usg_calls, ioc->usg_pages,
|
|
(int)((ioc->usg_pages * 1000)/ioc->usg_calls));
|
|
#endif /* CCIO_MAP_STATS */
|
|
|
|
ioc = ioc->next;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ccio_proc_info_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, &ccio_proc_info, NULL);
|
|
}
|
|
|
|
static const struct file_operations ccio_proc_info_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ccio_proc_info_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int ccio_proc_bitmap_info(struct seq_file *m, void *p)
|
|
{
|
|
int len = 0;
|
|
struct ioc *ioc = ioc_list;
|
|
|
|
while (ioc != NULL) {
|
|
u32 *res_ptr = (u32 *)ioc->res_map;
|
|
int j;
|
|
|
|
for (j = 0; j < (ioc->res_size / sizeof(u32)); j++) {
|
|
if ((j & 7) == 0)
|
|
len += seq_puts(m, "\n ");
|
|
len += seq_printf(m, "%08x", *res_ptr);
|
|
res_ptr++;
|
|
}
|
|
len += seq_puts(m, "\n\n");
|
|
ioc = ioc->next;
|
|
break; /* XXX - remove me */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ccio_proc_bitmap_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, &ccio_proc_bitmap_info, NULL);
|
|
}
|
|
|
|
static const struct file_operations ccio_proc_bitmap_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ccio_proc_bitmap_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* ccio_find_ioc - Find the ioc in the ioc_list
|
|
* @hw_path: The hardware path of the ioc.
|
|
*
|
|
* This function searches the ioc_list for an ioc that matches
|
|
* the provide hardware path.
|
|
*/
|
|
static struct ioc * ccio_find_ioc(int hw_path)
|
|
{
|
|
int i;
|
|
struct ioc *ioc;
|
|
|
|
ioc = ioc_list;
|
|
for (i = 0; i < ioc_count; i++) {
|
|
if (ioc->hw_path == hw_path)
|
|
return ioc;
|
|
|
|
ioc = ioc->next;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* ccio_get_iommu - Find the iommu which controls this device
|
|
* @dev: The parisc device.
|
|
*
|
|
* This function searches through the registered IOMMU's and returns
|
|
* the appropriate IOMMU for the device based on its hardware path.
|
|
*/
|
|
void * ccio_get_iommu(const struct parisc_device *dev)
|
|
{
|
|
dev = find_pa_parent_type(dev, HPHW_IOA);
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
return ccio_find_ioc(dev->hw_path);
|
|
}
|
|
|
|
#define CUJO_20_STEP 0x10000000 /* inc upper nibble */
|
|
|
|
/* Cujo 2.0 has a bug which will silently corrupt data being transferred
|
|
* to/from certain pages. To avoid this happening, we mark these pages
|
|
* as `used', and ensure that nothing will try to allocate from them.
|
|
*/
|
|
void ccio_cujo20_fixup(struct parisc_device *cujo, u32 iovp)
|
|
{
|
|
unsigned int idx;
|
|
struct parisc_device *dev = parisc_parent(cujo);
|
|
struct ioc *ioc = ccio_get_iommu(dev);
|
|
u8 *res_ptr;
|
|
|
|
ioc->cujo20_bug = 1;
|
|
res_ptr = ioc->res_map;
|
|
idx = PDIR_INDEX(iovp) >> 3;
|
|
|
|
while (idx < ioc->res_size) {
|
|
res_ptr[idx] |= 0xff;
|
|
idx += PDIR_INDEX(CUJO_20_STEP) >> 3;
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
/* GRANT - is this needed for U2 or not? */
|
|
|
|
/*
|
|
** Get the size of the I/O TLB for this I/O MMU.
|
|
**
|
|
** If spa_shift is non-zero (ie probably U2),
|
|
** then calculate the I/O TLB size using spa_shift.
|
|
**
|
|
** Otherwise we are supposed to get the IODC entry point ENTRY TLB
|
|
** and execute it. However, both U2 and Uturn firmware supplies spa_shift.
|
|
** I think only Java (K/D/R-class too?) systems don't do this.
|
|
*/
|
|
static int
|
|
ccio_get_iotlb_size(struct parisc_device *dev)
|
|
{
|
|
if (dev->spa_shift == 0) {
|
|
panic("%s() : Can't determine I/O TLB size.\n", __FUNCTION__);
|
|
}
|
|
return (1 << dev->spa_shift);
|
|
}
|
|
#else
|
|
|
|
/* Uturn supports 256 TLB entries */
|
|
#define CCIO_CHAINID_SHIFT 8
|
|
#define CCIO_CHAINID_MASK 0xff
|
|
#endif /* 0 */
|
|
|
|
/* We *can't* support JAVA (T600). Venture there at your own risk. */
|
|
static const struct parisc_device_id ccio_tbl[] = {
|
|
{ HPHW_IOA, HVERSION_REV_ANY_ID, U2_IOA_RUNWAY, 0xb }, /* U2 */
|
|
{ HPHW_IOA, HVERSION_REV_ANY_ID, UTURN_IOA_RUNWAY, 0xb }, /* UTurn */
|
|
{ 0, }
|
|
};
|
|
|
|
static int ccio_probe(struct parisc_device *dev);
|
|
|
|
static struct parisc_driver ccio_driver = {
|
|
.name = "ccio",
|
|
.id_table = ccio_tbl,
|
|
.probe = ccio_probe,
|
|
};
|
|
|
|
/**
|
|
* ccio_ioc_init - Initalize the I/O Controller
|
|
* @ioc: The I/O Controller.
|
|
*
|
|
* Initalize the I/O Controller which includes setting up the
|
|
* I/O Page Directory, the resource map, and initalizing the
|
|
* U2/Uturn chip into virtual mode.
|
|
*/
|
|
static void
|
|
ccio_ioc_init(struct ioc *ioc)
|
|
{
|
|
int i;
|
|
unsigned int iov_order;
|
|
u32 iova_space_size;
|
|
|
|
/*
|
|
** Determine IOVA Space size from memory size.
|
|
**
|
|
** Ideally, PCI drivers would register the maximum number
|
|
** of DMA they can have outstanding for each device they
|
|
** own. Next best thing would be to guess how much DMA
|
|
** can be outstanding based on PCI Class/sub-class. Both
|
|
** methods still require some "extra" to support PCI
|
|
** Hot-Plug/Removal of PCI cards. (aka PCI OLARD).
|
|
*/
|
|
|
|
iova_space_size = (u32) (num_physpages / count_parisc_driver(&ccio_driver));
|
|
|
|
/* limit IOVA space size to 1MB-1GB */
|
|
|
|
if (iova_space_size < (1 << (20 - PAGE_SHIFT))) {
|
|
iova_space_size = 1 << (20 - PAGE_SHIFT);
|
|
#ifdef __LP64__
|
|
} else if (iova_space_size > (1 << (30 - PAGE_SHIFT))) {
|
|
iova_space_size = 1 << (30 - PAGE_SHIFT);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
** iova space must be log2() in size.
|
|
** thus, pdir/res_map will also be log2().
|
|
*/
|
|
|
|
/* We could use larger page sizes in order to *decrease* the number
|
|
** of mappings needed. (ie 8k pages means 1/2 the mappings).
|
|
**
|
|
** Note: Grant Grunder says "Using 8k I/O pages isn't trivial either
|
|
** since the pages must also be physically contiguous - typically
|
|
** this is the case under linux."
|
|
*/
|
|
|
|
iov_order = get_order(iova_space_size << PAGE_SHIFT);
|
|
|
|
/* iova_space_size is now bytes, not pages */
|
|
iova_space_size = 1 << (iov_order + PAGE_SHIFT);
|
|
|
|
ioc->pdir_size = (iova_space_size / IOVP_SIZE) * sizeof(u64);
|
|
|
|
BUG_ON(ioc->pdir_size > 8 * 1024 * 1024); /* max pdir size <= 8MB */
|
|
|
|
/* Verify it's a power of two */
|
|
BUG_ON((1 << get_order(ioc->pdir_size)) != (ioc->pdir_size >> PAGE_SHIFT));
|
|
|
|
DBG_INIT("%s() hpa 0x%p mem %luMB IOV %dMB (%d bits)\n",
|
|
__FUNCTION__, ioc->ioc_regs,
|
|
(unsigned long) num_physpages >> (20 - PAGE_SHIFT),
|
|
iova_space_size>>20,
|
|
iov_order + PAGE_SHIFT);
|
|
|
|
ioc->pdir_base = (u64 *)__get_free_pages(GFP_KERNEL,
|
|
get_order(ioc->pdir_size));
|
|
if(NULL == ioc->pdir_base) {
|
|
panic("%s() could not allocate I/O Page Table\n", __FUNCTION__);
|
|
}
|
|
memset(ioc->pdir_base, 0, ioc->pdir_size);
|
|
|
|
BUG_ON((((unsigned long)ioc->pdir_base) & PAGE_MASK) != (unsigned long)ioc->pdir_base);
|
|
DBG_INIT(" base %p\n", ioc->pdir_base);
|
|
|
|
/* resource map size dictated by pdir_size */
|
|
ioc->res_size = (ioc->pdir_size / sizeof(u64)) >> 3;
|
|
DBG_INIT("%s() res_size 0x%x\n", __FUNCTION__, ioc->res_size);
|
|
|
|
ioc->res_map = (u8 *)__get_free_pages(GFP_KERNEL,
|
|
get_order(ioc->res_size));
|
|
if(NULL == ioc->res_map) {
|
|
panic("%s() could not allocate resource map\n", __FUNCTION__);
|
|
}
|
|
memset(ioc->res_map, 0, ioc->res_size);
|
|
|
|
/* Initialize the res_hint to 16 */
|
|
ioc->res_hint = 16;
|
|
|
|
/* Initialize the spinlock */
|
|
spin_lock_init(&ioc->res_lock);
|
|
|
|
/*
|
|
** Chainid is the upper most bits of an IOVP used to determine
|
|
** which TLB entry an IOVP will use.
|
|
*/
|
|
ioc->chainid_shift = get_order(iova_space_size) + PAGE_SHIFT - CCIO_CHAINID_SHIFT;
|
|
DBG_INIT(" chainid_shift 0x%x\n", ioc->chainid_shift);
|
|
|
|
/*
|
|
** Initialize IOA hardware
|
|
*/
|
|
WRITE_U32(CCIO_CHAINID_MASK << ioc->chainid_shift,
|
|
&ioc->ioc_regs->io_chain_id_mask);
|
|
|
|
WRITE_U32(virt_to_phys(ioc->pdir_base),
|
|
&ioc->ioc_regs->io_pdir_base);
|
|
|
|
/*
|
|
** Go to "Virtual Mode"
|
|
*/
|
|
WRITE_U32(IOA_NORMAL_MODE, &ioc->ioc_regs->io_control);
|
|
|
|
/*
|
|
** Initialize all I/O TLB entries to 0 (Valid bit off).
|
|
*/
|
|
WRITE_U32(0, &ioc->ioc_regs->io_tlb_entry_m);
|
|
WRITE_U32(0, &ioc->ioc_regs->io_tlb_entry_l);
|
|
|
|
for(i = 1 << CCIO_CHAINID_SHIFT; i ; i--) {
|
|
WRITE_U32((CMD_TLB_DIRECT_WRITE | (i << ioc->chainid_shift)),
|
|
&ioc->ioc_regs->io_command);
|
|
}
|
|
}
|
|
|
|
static void __init
|
|
ccio_init_resource(struct resource *res, char *name, void __iomem *ioaddr)
|
|
{
|
|
int result;
|
|
|
|
res->parent = NULL;
|
|
res->flags = IORESOURCE_MEM;
|
|
/*
|
|
* bracing ((signed) ...) are required for 64bit kernel because
|
|
* we only want to sign extend the lower 16 bits of the register.
|
|
* The upper 16-bits of range registers are hardcoded to 0xffff.
|
|
*/
|
|
res->start = (unsigned long)((signed) READ_U32(ioaddr) << 16);
|
|
res->end = (unsigned long)((signed) (READ_U32(ioaddr + 4) << 16) - 1);
|
|
res->name = name;
|
|
/*
|
|
* Check if this MMIO range is disable
|
|
*/
|
|
if (res->end + 1 == res->start)
|
|
return;
|
|
|
|
/* On some platforms (e.g. K-Class), we have already registered
|
|
* resources for devices reported by firmware. Some are children
|
|
* of ccio.
|
|
* "insert" ccio ranges in the mmio hierarchy (/proc/iomem).
|
|
*/
|
|
result = insert_resource(&iomem_resource, res);
|
|
if (result < 0) {
|
|
printk(KERN_ERR "%s() failed to claim CCIO bus address space (%08lx,%08lx)\n",
|
|
__FUNCTION__, res->start, res->end);
|
|
}
|
|
}
|
|
|
|
static void __init ccio_init_resources(struct ioc *ioc)
|
|
{
|
|
struct resource *res = ioc->mmio_region;
|
|
char *name = kmalloc(14, GFP_KERNEL);
|
|
|
|
snprintf(name, 14, "GSC Bus [%d/]", ioc->hw_path);
|
|
|
|
ccio_init_resource(res, name, &ioc->ioc_regs->io_io_low);
|
|
ccio_init_resource(res + 1, name, &ioc->ioc_regs->io_io_low_hv);
|
|
}
|
|
|
|
static int new_ioc_area(struct resource *res, unsigned long size,
|
|
unsigned long min, unsigned long max, unsigned long align)
|
|
{
|
|
if (max <= min)
|
|
return -EBUSY;
|
|
|
|
res->start = (max - size + 1) &~ (align - 1);
|
|
res->end = res->start + size;
|
|
|
|
/* We might be trying to expand the MMIO range to include
|
|
* a child device that has already registered it's MMIO space.
|
|
* Use "insert" instead of request_resource().
|
|
*/
|
|
if (!insert_resource(&iomem_resource, res))
|
|
return 0;
|
|
|
|
return new_ioc_area(res, size, min, max - size, align);
|
|
}
|
|
|
|
static int expand_ioc_area(struct resource *res, unsigned long size,
|
|
unsigned long min, unsigned long max, unsigned long align)
|
|
{
|
|
unsigned long start, len;
|
|
|
|
if (!res->parent)
|
|
return new_ioc_area(res, size, min, max, align);
|
|
|
|
start = (res->start - size) &~ (align - 1);
|
|
len = res->end - start + 1;
|
|
if (start >= min) {
|
|
if (!adjust_resource(res, start, len))
|
|
return 0;
|
|
}
|
|
|
|
start = res->start;
|
|
len = ((size + res->end + align) &~ (align - 1)) - start;
|
|
if (start + len <= max) {
|
|
if (!adjust_resource(res, start, len))
|
|
return 0;
|
|
}
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
/*
|
|
* Dino calls this function. Beware that we may get called on systems
|
|
* which have no IOC (725, B180, C160L, etc) but do have a Dino.
|
|
* So it's legal to find no parent IOC.
|
|
*
|
|
* Some other issues: one of the resources in the ioc may be unassigned.
|
|
*/
|
|
int ccio_allocate_resource(const struct parisc_device *dev,
|
|
struct resource *res, unsigned long size,
|
|
unsigned long min, unsigned long max, unsigned long align)
|
|
{
|
|
struct resource *parent = &iomem_resource;
|
|
struct ioc *ioc = ccio_get_iommu(dev);
|
|
if (!ioc)
|
|
goto out;
|
|
|
|
parent = ioc->mmio_region;
|
|
if (parent->parent &&
|
|
!allocate_resource(parent, res, size, min, max, align, NULL, NULL))
|
|
return 0;
|
|
|
|
if ((parent + 1)->parent &&
|
|
!allocate_resource(parent + 1, res, size, min, max, align,
|
|
NULL, NULL))
|
|
return 0;
|
|
|
|
if (!expand_ioc_area(parent, size, min, max, align)) {
|
|
__raw_writel(((parent->start)>>16) | 0xffff0000,
|
|
&ioc->ioc_regs->io_io_low);
|
|
__raw_writel(((parent->end)>>16) | 0xffff0000,
|
|
&ioc->ioc_regs->io_io_high);
|
|
} else if (!expand_ioc_area(parent + 1, size, min, max, align)) {
|
|
parent++;
|
|
__raw_writel(((parent->start)>>16) | 0xffff0000,
|
|
&ioc->ioc_regs->io_io_low_hv);
|
|
__raw_writel(((parent->end)>>16) | 0xffff0000,
|
|
&ioc->ioc_regs->io_io_high_hv);
|
|
} else {
|
|
return -EBUSY;
|
|
}
|
|
|
|
out:
|
|
return allocate_resource(parent, res, size, min, max, align, NULL,NULL);
|
|
}
|
|
|
|
int ccio_request_resource(const struct parisc_device *dev,
|
|
struct resource *res)
|
|
{
|
|
struct resource *parent;
|
|
struct ioc *ioc = ccio_get_iommu(dev);
|
|
|
|
if (!ioc) {
|
|
parent = &iomem_resource;
|
|
} else if ((ioc->mmio_region->start <= res->start) &&
|
|
(res->end <= ioc->mmio_region->end)) {
|
|
parent = ioc->mmio_region;
|
|
} else if (((ioc->mmio_region + 1)->start <= res->start) &&
|
|
(res->end <= (ioc->mmio_region + 1)->end)) {
|
|
parent = ioc->mmio_region + 1;
|
|
} else {
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* "transparent" bus bridges need to register MMIO resources
|
|
* firmware assigned them. e.g. children of hppb.c (e.g. K-class)
|
|
* registered their resources in the PDC "bus walk" (See
|
|
* arch/parisc/kernel/inventory.c).
|
|
*/
|
|
return insert_resource(parent, res);
|
|
}
|
|
|
|
/**
|
|
* ccio_probe - Determine if ccio should claim this device.
|
|
* @dev: The device which has been found
|
|
*
|
|
* Determine if ccio should claim this chip (return 0) or not (return 1).
|
|
* If so, initialize the chip and tell other partners in crime they
|
|
* have work to do.
|
|
*/
|
|
static int __init ccio_probe(struct parisc_device *dev)
|
|
{
|
|
int i;
|
|
struct ioc *ioc, **ioc_p = &ioc_list;
|
|
struct proc_dir_entry *info_entry, *bitmap_entry;
|
|
|
|
ioc = kzalloc(sizeof(struct ioc), GFP_KERNEL);
|
|
if (ioc == NULL) {
|
|
printk(KERN_ERR MODULE_NAME ": memory allocation failure\n");
|
|
return 1;
|
|
}
|
|
|
|
ioc->name = dev->id.hversion == U2_IOA_RUNWAY ? "U2" : "UTurn";
|
|
|
|
printk(KERN_INFO "Found %s at 0x%lx\n", ioc->name, dev->hpa.start);
|
|
|
|
for (i = 0; i < ioc_count; i++) {
|
|
ioc_p = &(*ioc_p)->next;
|
|
}
|
|
*ioc_p = ioc;
|
|
|
|
ioc->hw_path = dev->hw_path;
|
|
ioc->ioc_regs = ioremap_nocache(dev->hpa.start, 4096);
|
|
ccio_ioc_init(ioc);
|
|
ccio_init_resources(ioc);
|
|
hppa_dma_ops = &ccio_ops;
|
|
dev->dev.platform_data = kzalloc(sizeof(struct pci_hba_data), GFP_KERNEL);
|
|
|
|
/* if this fails, no I/O cards will work, so may as well bug */
|
|
BUG_ON(dev->dev.platform_data == NULL);
|
|
HBA_DATA(dev->dev.platform_data)->iommu = ioc;
|
|
|
|
if (ioc_count == 0) {
|
|
info_entry = create_proc_entry(MODULE_NAME, 0, proc_runway_root);
|
|
if (info_entry)
|
|
info_entry->proc_fops = &ccio_proc_info_fops;
|
|
|
|
bitmap_entry = create_proc_entry(MODULE_NAME"-bitmap", 0, proc_runway_root);
|
|
if (bitmap_entry)
|
|
bitmap_entry->proc_fops = &ccio_proc_bitmap_fops;
|
|
}
|
|
|
|
ioc_count++;
|
|
|
|
parisc_vmerge_boundary = IOVP_SIZE;
|
|
parisc_vmerge_max_size = BITS_PER_LONG * IOVP_SIZE;
|
|
parisc_has_iommu();
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ccio_init - ccio initialization procedure.
|
|
*
|
|
* Register this driver.
|
|
*/
|
|
void __init ccio_init(void)
|
|
{
|
|
register_parisc_driver(&ccio_driver);
|
|
}
|
|
|