![Kees Cook](/assets/img/avatar_default.png)
The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
456 lines
11 KiB
C
456 lines
11 KiB
C
/*
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* arch/arm/mach-ixp4xx/common-pci.c
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*
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* IXP4XX PCI routines for all platforms
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*
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* Maintainer: Deepak Saxena <dsaxena@plexity.net>
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*
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* Copyright (C) 2002 Intel Corporation.
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* Copyright (C) 2003 Greg Ungerer <gerg@snapgear.com>
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* Copyright (C) 2003-2004 MontaVista Software, Inc.
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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 version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <asm/dma-mapping.h>
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#include <asm/cputype.h>
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#include <asm/irq.h>
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#include <asm/sizes.h>
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#include <asm/mach/pci.h>
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#include <mach/hardware.h>
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/*
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* IXP4xx PCI read function is dependent on whether we are
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* running A0 or B0 (AppleGate) silicon.
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*/
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int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
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/*
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* Base address for PCI register region
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*/
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unsigned long ixp4xx_pci_reg_base = 0;
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/*
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* PCI cfg an I/O routines are done by programming a
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* command/byte enable register, and then read/writing
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* the data from a data register. We need to ensure
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* these transactions are atomic or we will end up
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* with corrupt data on the bus or in a driver.
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*/
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static DEFINE_RAW_SPINLOCK(ixp4xx_pci_lock);
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/*
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* Read from PCI config space
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*/
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static void crp_read(u32 ad_cbe, u32 *data)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
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*PCI_CRP_AD_CBE = ad_cbe;
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*data = *PCI_CRP_RDATA;
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raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
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}
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/*
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* Write to PCI config space
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*/
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static void crp_write(u32 ad_cbe, u32 data)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
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*PCI_CRP_AD_CBE = CRP_AD_CBE_WRITE | ad_cbe;
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*PCI_CRP_WDATA = data;
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raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
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}
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static inline int check_master_abort(void)
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{
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/* check Master Abort bit after access */
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unsigned long isr = *PCI_ISR;
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if (isr & PCI_ISR_PFE) {
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/* make sure the Master Abort bit is reset */
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*PCI_ISR = PCI_ISR_PFE;
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pr_debug("%s failed\n", __func__);
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return 1;
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}
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return 0;
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}
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int ixp4xx_pci_read_errata(u32 addr, u32 cmd, u32* data)
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{
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unsigned long flags;
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int retval = 0;
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int i;
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raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
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*PCI_NP_AD = addr;
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/*
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* PCI workaround - only works if NP PCI space reads have
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* no side effects!!! Read 8 times. last one will be good.
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*/
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for (i = 0; i < 8; i++) {
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*PCI_NP_CBE = cmd;
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*data = *PCI_NP_RDATA;
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*data = *PCI_NP_RDATA;
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}
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if(check_master_abort())
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retval = 1;
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raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
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return retval;
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}
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int ixp4xx_pci_read_no_errata(u32 addr, u32 cmd, u32* data)
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{
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unsigned long flags;
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int retval = 0;
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raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
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*PCI_NP_AD = addr;
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/* set up and execute the read */
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*PCI_NP_CBE = cmd;
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/* the result of the read is now in NP_RDATA */
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*data = *PCI_NP_RDATA;
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if(check_master_abort())
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retval = 1;
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raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
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return retval;
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}
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int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data)
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{
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unsigned long flags;
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int retval = 0;
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raw_spin_lock_irqsave(&ixp4xx_pci_lock, flags);
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*PCI_NP_AD = addr;
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/* set up the write */
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*PCI_NP_CBE = cmd;
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/* execute the write by writing to NP_WDATA */
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*PCI_NP_WDATA = data;
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if(check_master_abort())
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retval = 1;
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raw_spin_unlock_irqrestore(&ixp4xx_pci_lock, flags);
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return retval;
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}
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static u32 ixp4xx_config_addr(u8 bus_num, u16 devfn, int where)
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{
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u32 addr;
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if (!bus_num) {
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/* type 0 */
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addr = BIT(32-PCI_SLOT(devfn)) | ((PCI_FUNC(devfn)) << 8) |
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(where & ~3);
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} else {
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/* type 1 */
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addr = (bus_num << 16) | ((PCI_SLOT(devfn)) << 11) |
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((PCI_FUNC(devfn)) << 8) | (where & ~3) | 1;
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}
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return addr;
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}
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/*
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* Mask table, bits to mask for quantity of size 1, 2 or 4 bytes.
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* 0 and 3 are not valid indexes...
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*/
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static u32 bytemask[] = {
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/*0*/ 0,
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/*1*/ 0xff,
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/*2*/ 0xffff,
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/*3*/ 0,
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/*4*/ 0xffffffff,
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};
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static u32 local_byte_lane_enable_bits(u32 n, int size)
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{
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if (size == 1)
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return (0xf & ~BIT(n)) << CRP_AD_CBE_BESL;
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if (size == 2)
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return (0xf & ~(BIT(n) | BIT(n+1))) << CRP_AD_CBE_BESL;
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if (size == 4)
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return 0;
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return 0xffffffff;
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}
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static int local_read_config(int where, int size, u32 *value)
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{
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u32 n, data;
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pr_debug("local_read_config from %d size %d\n", where, size);
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n = where % 4;
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crp_read(where & ~3, &data);
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*value = (data >> (8*n)) & bytemask[size];
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pr_debug("local_read_config read %#x\n", *value);
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return PCIBIOS_SUCCESSFUL;
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}
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static int local_write_config(int where, int size, u32 value)
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{
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u32 n, byte_enables, data;
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pr_debug("local_write_config %#x to %d size %d\n", value, where, size);
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n = where % 4;
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byte_enables = local_byte_lane_enable_bits(n, size);
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if (byte_enables == 0xffffffff)
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return PCIBIOS_BAD_REGISTER_NUMBER;
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data = value << (8*n);
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crp_write((where & ~3) | byte_enables, data);
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return PCIBIOS_SUCCESSFUL;
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}
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static u32 byte_lane_enable_bits(u32 n, int size)
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{
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if (size == 1)
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return (0xf & ~BIT(n)) << 4;
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if (size == 2)
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return (0xf & ~(BIT(n) | BIT(n+1))) << 4;
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if (size == 4)
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return 0;
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return 0xffffffff;
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}
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static int ixp4xx_pci_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
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{
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u32 n, byte_enables, addr, data;
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u8 bus_num = bus->number;
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pr_debug("read_config from %d size %d dev %d:%d:%d\n", where, size,
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bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
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*value = 0xffffffff;
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n = where % 4;
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byte_enables = byte_lane_enable_bits(n, size);
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if (byte_enables == 0xffffffff)
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return PCIBIOS_BAD_REGISTER_NUMBER;
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addr = ixp4xx_config_addr(bus_num, devfn, where);
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if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_CONFIGREAD, &data))
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return PCIBIOS_DEVICE_NOT_FOUND;
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*value = (data >> (8*n)) & bytemask[size];
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pr_debug("read_config_byte read %#x\n", *value);
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return PCIBIOS_SUCCESSFUL;
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}
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static int ixp4xx_pci_write_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
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{
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u32 n, byte_enables, addr, data;
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u8 bus_num = bus->number;
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pr_debug("write_config_byte %#x to %d size %d dev %d:%d:%d\n", value, where,
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size, bus_num, PCI_SLOT(devfn), PCI_FUNC(devfn));
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n = where % 4;
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byte_enables = byte_lane_enable_bits(n, size);
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if (byte_enables == 0xffffffff)
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return PCIBIOS_BAD_REGISTER_NUMBER;
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addr = ixp4xx_config_addr(bus_num, devfn, where);
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data = value << (8*n);
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if (ixp4xx_pci_write(addr, byte_enables | NP_CMD_CONFIGWRITE, data))
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops ixp4xx_ops = {
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.read = ixp4xx_pci_read_config,
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.write = ixp4xx_pci_write_config,
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};
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/*
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* PCI abort handler
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*/
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static int abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
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{
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u32 isr, status;
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isr = *PCI_ISR;
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local_read_config(PCI_STATUS, 2, &status);
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pr_debug("PCI: abort_handler addr = %#lx, isr = %#x, "
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"status = %#x\n", addr, isr, status);
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/* make sure the Master Abort bit is reset */
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*PCI_ISR = PCI_ISR_PFE;
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status |= PCI_STATUS_REC_MASTER_ABORT;
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local_write_config(PCI_STATUS, 2, status);
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/*
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* If it was an imprecise abort, then we need to correct the
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* return address to be _after_ the instruction.
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*/
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if (fsr & (1 << 10))
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regs->ARM_pc += 4;
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return 0;
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}
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void __init ixp4xx_pci_preinit(void)
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{
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unsigned long cpuid = read_cpuid_id();
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#ifdef CONFIG_IXP4XX_INDIRECT_PCI
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pcibios_min_mem = 0x10000000; /* 1 GB of indirect PCI MMIO space */
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#else
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pcibios_min_mem = 0x48000000; /* 64 MB of PCI MMIO space */
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#endif
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/*
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* Determine which PCI read method to use.
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* Rev 0 IXP425 requires workaround.
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*/
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if (!(cpuid & 0xf) && cpu_is_ixp42x()) {
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printk("PCI: IXP42x A0 silicon detected - "
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"PCI Non-Prefetch Workaround Enabled\n");
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ixp4xx_pci_read = ixp4xx_pci_read_errata;
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} else
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ixp4xx_pci_read = ixp4xx_pci_read_no_errata;
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/* hook in our fault handler for PCI errors */
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hook_fault_code(16+6, abort_handler, SIGBUS, 0,
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"imprecise external abort");
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pr_debug("setup PCI-AHB(inbound) and AHB-PCI(outbound) address mappings\n");
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/*
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* We use identity AHB->PCI address translation
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* in the 0x48000000 to 0x4bffffff address space
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*/
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*PCI_PCIMEMBASE = 0x48494A4B;
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/*
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* We also use identity PCI->AHB address translation
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* in 4 16MB BARs that begin at the physical memory start
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*/
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*PCI_AHBMEMBASE = (PHYS_OFFSET & 0xFF000000) +
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((PHYS_OFFSET & 0xFF000000) >> 8) +
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((PHYS_OFFSET & 0xFF000000) >> 16) +
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((PHYS_OFFSET & 0xFF000000) >> 24) +
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0x00010203;
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if (*PCI_CSR & PCI_CSR_HOST) {
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printk("PCI: IXP4xx is host\n");
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pr_debug("setup BARs in controller\n");
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/*
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* We configure the PCI inbound memory windows to be
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* 1:1 mapped to SDRAM
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*/
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local_write_config(PCI_BASE_ADDRESS_0, 4, PHYS_OFFSET);
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local_write_config(PCI_BASE_ADDRESS_1, 4, PHYS_OFFSET + SZ_16M);
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local_write_config(PCI_BASE_ADDRESS_2, 4, PHYS_OFFSET + SZ_32M);
|
|
local_write_config(PCI_BASE_ADDRESS_3, 4,
|
|
PHYS_OFFSET + SZ_32M + SZ_16M);
|
|
|
|
/*
|
|
* Enable CSR window at 64 MiB to allow PCI masters
|
|
* to continue prefetching past 64 MiB boundary.
|
|
*/
|
|
local_write_config(PCI_BASE_ADDRESS_4, 4, PHYS_OFFSET + SZ_64M);
|
|
|
|
/*
|
|
* Enable the IO window to be way up high, at 0xfffffc00
|
|
*/
|
|
local_write_config(PCI_BASE_ADDRESS_5, 4, 0xfffffc01);
|
|
local_write_config(0x40, 4, 0x000080FF); /* No TRDY time limit */
|
|
} else {
|
|
printk("PCI: IXP4xx is target - No bus scan performed\n");
|
|
}
|
|
|
|
printk("PCI: IXP4xx Using %s access for memory space\n",
|
|
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
|
|
"direct"
|
|
#else
|
|
"indirect"
|
|
#endif
|
|
);
|
|
|
|
pr_debug("clear error bits in ISR\n");
|
|
*PCI_ISR = PCI_ISR_PSE | PCI_ISR_PFE | PCI_ISR_PPE | PCI_ISR_AHBE;
|
|
|
|
/*
|
|
* Set Initialize Complete in PCI Control Register: allow IXP4XX to
|
|
* respond to PCI configuration cycles. Specify that the AHB bus is
|
|
* operating in big endian mode. Set up byte lane swapping between
|
|
* little-endian PCI and the big-endian AHB bus
|
|
*/
|
|
#ifdef __ARMEB__
|
|
*PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE | PCI_CSR_PDS | PCI_CSR_ADS;
|
|
#else
|
|
*PCI_CSR = PCI_CSR_IC | PCI_CSR_ABE;
|
|
#endif
|
|
|
|
pr_debug("DONE\n");
|
|
}
|
|
|
|
int ixp4xx_setup(int nr, struct pci_sys_data *sys)
|
|
{
|
|
struct resource *res;
|
|
|
|
if (nr >= 1)
|
|
return 0;
|
|
|
|
res = kcalloc(2, sizeof(*res), GFP_KERNEL);
|
|
if (res == NULL) {
|
|
/*
|
|
* If we're out of memory this early, something is wrong,
|
|
* so we might as well catch it here.
|
|
*/
|
|
panic("PCI: unable to allocate resources?\n");
|
|
}
|
|
|
|
local_write_config(PCI_COMMAND, 2, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
|
|
|
|
res[0].name = "PCI I/O Space";
|
|
res[0].start = 0x00000000;
|
|
res[0].end = 0x0000ffff;
|
|
res[0].flags = IORESOURCE_IO;
|
|
|
|
res[1].name = "PCI Memory Space";
|
|
res[1].start = PCIBIOS_MIN_MEM;
|
|
res[1].end = PCIBIOS_MAX_MEM;
|
|
res[1].flags = IORESOURCE_MEM;
|
|
|
|
request_resource(&ioport_resource, &res[0]);
|
|
request_resource(&iomem_resource, &res[1]);
|
|
|
|
pci_add_resource_offset(&sys->resources, &res[0], sys->io_offset);
|
|
pci_add_resource_offset(&sys->resources, &res[1], sys->mem_offset);
|
|
|
|
return 1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ixp4xx_pci_read);
|
|
EXPORT_SYMBOL(ixp4xx_pci_write);
|