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[2604:1380:45d1:ec00::1]) by mx.google.com with ESMTPS id pe24-20020a056214495800b0067a29f9abdasi28862177qvb.438.2023.12.19.14.11.17 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Dec 2023 14:11:17 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-6026-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=brfgQFpt; spf=pass (google.com: domain of linux-kernel+bounces-6026-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-6026-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ny.mirrors.kernel.org (Postfix) with ESMTPS id 1C3FE1C25062 for ; Tue, 19 Dec 2023 22:11:17 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 3E18457329; Tue, 19 Dec 2023 22:03:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="brfgQFpt" X-Original-To: linux-kernel@vger.kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E83340BE2; Tue, 19 Dec 2023 22:03:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 79DABC116B2; Tue, 19 Dec 2023 22:03:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1703023396; bh=UB1EWouMkPvbJXRw7Maaf3UmeM7vwSYlSrzpC90jDq8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=brfgQFpt+jxnTxK6GQpbXKutNle131V8tJZzA7e3bjKM8mjnD9YIVHewSdo2PHl0I ZjPJgn2ELJJ+b2gKhR2rxujXCB2YCvroPGL5A8LSxivVh2/++3qw+UbKPvC2W9PKTY 4tIG6dNDmxbtjkH+q9QneFTm6/I0WtY+LDtb23Sl/d8kyrOl+1cLsUw2/BNE4C1GaY mxvkoinx6EP4ZgdmkIIDFPDrhNWtRH66f1mU08n3O86fw4l3RSvcXb8j/xRX1ix7FE w0WWQlDEziRNbYLq5KBj/95mEzzPZfgj0HXqInISdjMiJ5dliZ253mNok38CyK7TW4 mKviq5RLHmPog== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A71FC46CD8; Tue, 19 Dec 2023 22:03:16 +0000 (UTC) From: Sam Ravnborg via B4 Relay Date: Tue, 19 Dec 2023 23:03:26 +0100 Subject: [PATCH 21/27] sparc32: Drop unused iommu support Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20231219-sam-sparc32-sunset-v3-v1-21-64bb44b598c5@ravnborg.org> References: <20231219-sam-sparc32-sunset-v3-v1-0-64bb44b598c5@ravnborg.org> In-Reply-To: <20231219-sam-sparc32-sunset-v3-v1-0-64bb44b598c5@ravnborg.org> To: "David S. Miller" , Arnd Bergmann , Andreas Larsson Cc: Helge Deller , Alexander Viro , Greg Kroah-Hartman , Alan Stern , Jaroslav Kysela , Takashi Iwai , sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-sound@vger.kernel.org, Sam Ravnborg X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1703023392; l=21784; i=sam@ravnborg.org; s=20230107; h=from:subject:message-id; bh=PD7kaCb8qP6VRW5/Lnvuu2MI0m+xNGJym35Bpgc5CXI=; =?utf-8?q?b=3DO+TG5SrRJTL1?= =?utf-8?q?qnYo4kokm2BxcVRJvjN/NxIEx96zcmeX8Q+YiSV3tM1t5knEwxA9CeWREscMdZqn?= 0tQ+gt2rB+n4k3fmP+9nmowGi6GYZkULiZ87wmX5ajzBSGJFgGtc X-Developer-Key: i=sam@ravnborg.org; a=ed25519; pk=R0+pqV7BRYOAeOIGkyOrSNke7arx5y3LkEuNi37YEyU= X-Endpoint-Received: by B4 Relay for sam@ravnborg.org/20230107 with auth_id=22 X-Original-From: Sam Ravnborg Reply-To: From: Sam Ravnborg LEON do not have any iommu support - drop it. Signed-off-by: Sam Ravnborg Cc: "David S. Miller" Cc: Arnd Bergmann Cc: Andreas Larsson --- arch/sparc/include/asm/iommu.h | 2 - arch/sparc/include/asm/iommu_32.h | 122 ----------- arch/sparc/kernel/ioport.c | 1 - arch/sparc/mm/Makefile | 2 +- arch/sparc/mm/iommu.c | 420 -------------------------------------- arch/sparc/mm/mm_32.h | 3 - arch/sparc/mm/srmmu.c | 3 - 7 files changed, 1 insertion(+), 552 deletions(-) diff --git a/arch/sparc/include/asm/iommu.h b/arch/sparc/include/asm/iommu.h index 37935cb34865..ea07526ff476 100644 --- a/arch/sparc/include/asm/iommu.h +++ b/arch/sparc/include/asm/iommu.h @@ -3,7 +3,5 @@ #define ___ASM_SPARC_IOMMU_H #if defined(__sparc__) && defined(__arch64__) #include -#else -#include #endif #endif diff --git a/arch/sparc/include/asm/iommu_32.h b/arch/sparc/include/asm/iommu_32.h deleted file mode 100644 index af51cd5ea3c1..000000000000 --- a/arch/sparc/include/asm/iommu_32.h +++ /dev/null @@ -1,122 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* iommu.h: Definitions for the sun4m IOMMU. - * - * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) - */ -#ifndef _SPARC_IOMMU_H -#define _SPARC_IOMMU_H - -#include -#include - -/* The iommu handles all virtual to physical address translations - * that occur between the SBUS and physical memory. Access by - * the cpu to IO registers and similar go over the mbus so are - * translated by the on chip SRMMU. The iommu and the srmmu do - * not need to have the same translations at all, in fact most - * of the time the translations they handle are a disjunct set. - * Basically the iommu handles all dvma sbus activity. - */ - -/* The IOMMU registers occupy three pages in IO space. */ -struct iommu_regs { - /* First page */ - volatile unsigned long control; /* IOMMU control */ - volatile unsigned long base; /* Physical base of iopte page table */ - volatile unsigned long _unused1[3]; - volatile unsigned long tlbflush; /* write only */ - volatile unsigned long pageflush; /* write only */ - volatile unsigned long _unused2[1017]; - /* Second page */ - volatile unsigned long afsr; /* Async-fault status register */ - volatile unsigned long afar; /* Async-fault physical address */ - volatile unsigned long _unused3[2]; - volatile unsigned long sbuscfg0; /* SBUS configuration registers, per-slot */ - volatile unsigned long sbuscfg1; - volatile unsigned long sbuscfg2; - volatile unsigned long sbuscfg3; - volatile unsigned long mfsr; /* Memory-fault status register */ - volatile unsigned long mfar; /* Memory-fault physical address */ - volatile unsigned long _unused4[1014]; - /* Third page */ - volatile unsigned long mid; /* IOMMU module-id */ -}; - -#define IOMMU_CTRL_IMPL 0xf0000000 /* Implementation */ -#define IOMMU_CTRL_VERS 0x0f000000 /* Version */ -#define IOMMU_CTRL_RNGE 0x0000001c /* Mapping RANGE */ -#define IOMMU_RNGE_16MB 0x00000000 /* 0xff000000 -> 0xffffffff */ -#define IOMMU_RNGE_32MB 0x00000004 /* 0xfe000000 -> 0xffffffff */ -#define IOMMU_RNGE_64MB 0x00000008 /* 0xfc000000 -> 0xffffffff */ -#define IOMMU_RNGE_128MB 0x0000000c /* 0xf8000000 -> 0xffffffff */ -#define IOMMU_RNGE_256MB 0x00000010 /* 0xf0000000 -> 0xffffffff */ -#define IOMMU_RNGE_512MB 0x00000014 /* 0xe0000000 -> 0xffffffff */ -#define IOMMU_RNGE_1GB 0x00000018 /* 0xc0000000 -> 0xffffffff */ -#define IOMMU_RNGE_2GB 0x0000001c /* 0x80000000 -> 0xffffffff */ -#define IOMMU_CTRL_ENAB 0x00000001 /* IOMMU Enable */ - -#define IOMMU_AFSR_ERR 0x80000000 /* LE, TO, or BE asserted */ -#define IOMMU_AFSR_LE 0x40000000 /* SBUS reports error after transaction */ -#define IOMMU_AFSR_TO 0x20000000 /* Write access took more than 12.8 us. */ -#define IOMMU_AFSR_BE 0x10000000 /* Write access received error acknowledge */ -#define IOMMU_AFSR_SIZE 0x0e000000 /* Size of transaction causing error */ -#define IOMMU_AFSR_S 0x01000000 /* Sparc was in supervisor mode */ -#define IOMMU_AFSR_RESV 0x00f00000 /* Reserver, forced to 0x8 by hardware */ -#define IOMMU_AFSR_ME 0x00080000 /* Multiple errors occurred */ -#define IOMMU_AFSR_RD 0x00040000 /* A read operation was in progress */ -#define IOMMU_AFSR_FAV 0x00020000 /* IOMMU afar has valid contents */ - -#define IOMMU_SBCFG_SAB30 0x00010000 /* Phys-address bit 30 when bypass enabled */ -#define IOMMU_SBCFG_BA16 0x00000004 /* Slave supports 16 byte bursts */ -#define IOMMU_SBCFG_BA8 0x00000002 /* Slave supports 8 byte bursts */ -#define IOMMU_SBCFG_BYPASS 0x00000001 /* Bypass IOMMU, treat all addresses - produced by this device as pure - physical. */ - -#define IOMMU_MFSR_ERR 0x80000000 /* One or more of PERR1 or PERR0 */ -#define IOMMU_MFSR_S 0x01000000 /* Sparc was in supervisor mode */ -#define IOMMU_MFSR_CPU 0x00800000 /* CPU transaction caused parity error */ -#define IOMMU_MFSR_ME 0x00080000 /* Multiple parity errors occurred */ -#define IOMMU_MFSR_PERR 0x00006000 /* high bit indicates parity error occurred - on the even word of the access, low bit - indicated odd word caused the parity error */ -#define IOMMU_MFSR_BM 0x00001000 /* Error occurred while in boot mode */ -#define IOMMU_MFSR_C 0x00000800 /* Address causing error was marked cacheable */ -#define IOMMU_MFSR_RTYP 0x000000f0 /* Memory request transaction type */ - -#define IOMMU_MID_SBAE 0x001f0000 /* SBus arbitration enable */ -#define IOMMU_MID_SE 0x00100000 /* Enables SCSI/ETHERNET arbitration */ -#define IOMMU_MID_SB3 0x00080000 /* Enable SBUS device 3 arbitration */ -#define IOMMU_MID_SB2 0x00040000 /* Enable SBUS device 2 arbitration */ -#define IOMMU_MID_SB1 0x00020000 /* Enable SBUS device 1 arbitration */ -#define IOMMU_MID_SB0 0x00010000 /* Enable SBUS device 0 arbitration */ -#define IOMMU_MID_MID 0x0000000f /* Module-id, hardcoded to 0x8 */ - -/* The format of an iopte in the page tables */ -#define IOPTE_PAGE 0x07ffff00 /* Physical page number (PA[30:12]) */ -#define IOPTE_CACHE 0x00000080 /* Cached (in vme IOCACHE or Viking/MXCC) */ -#define IOPTE_WRITE 0x00000004 /* Writeable */ -#define IOPTE_VALID 0x00000002 /* IOPTE is valid */ -#define IOPTE_WAZ 0x00000001 /* Write as zeros */ - -struct iommu_struct { - struct iommu_regs __iomem *regs; - iopte_t *page_table; - /* For convenience */ - unsigned long start; /* First managed virtual address */ - unsigned long end; /* Last managed virtual address */ - - struct bit_map usemap; -}; - -static inline void iommu_invalidate(struct iommu_regs __iomem *regs) -{ - sbus_writel(0, ®s->tlbflush); -} - -static inline void iommu_invalidate_page(struct iommu_regs __iomem *regs, unsigned long ba) -{ - sbus_writel(ba & PAGE_MASK, ®s->pageflush); -} - -#endif /* !(_SPARC_IOMMU_H) */ diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c index 745579a40785..9c4c72775274 100644 --- a/arch/sparc/kernel/ioport.c +++ b/arch/sparc/kernel/ioport.c @@ -48,7 +48,6 @@ #include #include #include -#include #include static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz); diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile index ee33053b170a..b6252a3947c5 100644 --- a/arch/sparc/mm/Makefile +++ b/arch/sparc/mm/Makefile @@ -8,7 +8,7 @@ ccflags-y := -Werror obj-$(CONFIG_SPARC64) += ultra.o tlb.o tsb.o obj-y += fault_$(BITS).o obj-y += init_$(BITS).o -obj-$(CONFIG_SPARC32) += srmmu.o iommu.o +obj-$(CONFIG_SPARC32) += srmmu.o obj-$(CONFIG_SPARC32) += leon_mm.o # Only used by sparc64 diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c deleted file mode 100644 index 482e08df7bad..000000000000 --- a/arch/sparc/mm/iommu.c +++ /dev/null @@ -1,420 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * iommu.c: IOMMU specific routines for memory management. - * - * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) - * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@yahoo.com) - * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) - * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) - */ - -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -#include "mm_32.h" - -/* - * This can be sized dynamically, but we will do this - * only when we have a guidance about actual I/O pressures. - */ -#define IOMMU_RNGE IOMMU_RNGE_256MB -#define IOMMU_START 0xF0000000 -#define IOMMU_WINSIZE (256*1024*1024U) -#define IOMMU_NPTES (IOMMU_WINSIZE/PAGE_SIZE) /* 64K PTEs, 256KB */ -#define IOMMU_ORDER 6 /* 4096 * (1<<6) */ - -/* - * Values precomputed according to CPU type. - */ -static unsigned int ioperm_noc; /* Consistent mapping iopte flags */ -static pgprot_t dvma_prot; /* Consistent mapping pte flags */ - -#define IOPERM (IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID) -#define MKIOPTE(pfn, perm) (((((pfn)<<8) & IOPTE_PAGE) | (perm)) & ~IOPTE_WAZ) - -static const struct dma_map_ops sbus_iommu_dma_gflush_ops; -static const struct dma_map_ops sbus_iommu_dma_pflush_ops; - -static void __init sbus_iommu_init(struct platform_device *op) -{ - struct iommu_struct *iommu; - unsigned int impl, vers; - unsigned long *bitmap; - unsigned long control; - unsigned long base; - unsigned long tmp; - - iommu = kmalloc(sizeof(struct iommu_struct), GFP_KERNEL); - if (!iommu) { - prom_printf("Unable to allocate iommu structure\n"); - prom_halt(); - } - - iommu->regs = of_ioremap(&op->resource[0], 0, PAGE_SIZE * 3, - "iommu_regs"); - if (!iommu->regs) { - prom_printf("Cannot map IOMMU registers\n"); - prom_halt(); - } - - control = sbus_readl(&iommu->regs->control); - impl = (control & IOMMU_CTRL_IMPL) >> 28; - vers = (control & IOMMU_CTRL_VERS) >> 24; - control &= ~(IOMMU_CTRL_RNGE); - control |= (IOMMU_RNGE_256MB | IOMMU_CTRL_ENAB); - sbus_writel(control, &iommu->regs->control); - - iommu_invalidate(iommu->regs); - iommu->start = IOMMU_START; - iommu->end = 0xffffffff; - - /* Allocate IOMMU page table */ - /* Stupid alignment constraints give me a headache. - We need 256K or 512K or 1M or 2M area aligned to - its size and current gfp will fortunately give - it to us. */ - tmp = __get_free_pages(GFP_KERNEL, IOMMU_ORDER); - if (!tmp) { - prom_printf("Unable to allocate iommu table [0x%lx]\n", - IOMMU_NPTES * sizeof(iopte_t)); - prom_halt(); - } - iommu->page_table = (iopte_t *)tmp; - - /* Initialize new table. */ - memset(iommu->page_table, 0, IOMMU_NPTES*sizeof(iopte_t)); - flush_cache_all(); - flush_tlb_all(); - - base = __pa((unsigned long)iommu->page_table) >> 4; - sbus_writel(base, &iommu->regs->base); - iommu_invalidate(iommu->regs); - - bitmap = kmalloc(IOMMU_NPTES>>3, GFP_KERNEL); - if (!bitmap) { - prom_printf("Unable to allocate iommu bitmap [%d]\n", - (int)(IOMMU_NPTES>>3)); - prom_halt(); - } - bit_map_init(&iommu->usemap, bitmap, IOMMU_NPTES); - iommu->usemap.num_colors = 1; - - printk(KERN_INFO "IOMMU: impl %d vers %d table 0x%p[%d B] map [%d b]\n", - impl, vers, iommu->page_table, - (int)(IOMMU_NPTES*sizeof(iopte_t)), (int)IOMMU_NPTES); - - op->dev.archdata.iommu = iommu; - - if (flush_page_for_dma_global) - op->dev.dma_ops = &sbus_iommu_dma_gflush_ops; - else - op->dev.dma_ops = &sbus_iommu_dma_pflush_ops; -} - -static int __init iommu_init(void) -{ - struct device_node *dp; - - for_each_node_by_name(dp, "iommu") { - struct platform_device *op = of_find_device_by_node(dp); - - sbus_iommu_init(op); - of_propagate_archdata(op); - } - - return 0; -} - -subsys_initcall(iommu_init); - -/* Flush the iotlb entries to ram. */ -/* This could be better if we didn't have to flush whole pages. */ -static void iommu_flush_iotlb(iopte_t *iopte, unsigned int niopte) -{ - unsigned long start; - unsigned long end; - - start = (unsigned long)iopte; - end = PAGE_ALIGN(start + niopte*sizeof(iopte_t)); - start &= PAGE_MASK; - while(start < end) { - __flush_page_to_ram(start); - start += PAGE_SIZE; - } -} - -static dma_addr_t __sbus_iommu_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t len, bool per_page_flush) -{ - struct iommu_struct *iommu = dev->archdata.iommu; - phys_addr_t paddr = page_to_phys(page) + offset; - unsigned long off = paddr & ~PAGE_MASK; - unsigned long npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT; - unsigned long pfn = __phys_to_pfn(paddr); - unsigned int busa, busa0; - iopte_t *iopte, *iopte0; - int ioptex, i; - - /* XXX So what is maxphys for us and how do drivers know it? */ - if (!len || len > 256 * 1024) - return DMA_MAPPING_ERROR; - - /* - * We expect unmapped highmem pages to be not in the cache. - * XXX Is this a good assumption? - * XXX What if someone else unmaps it here and races us? - */ - if (per_page_flush && !PageHighMem(page)) { - unsigned long vaddr, p; - - vaddr = (unsigned long)page_address(page) + offset; - for (p = vaddr & PAGE_MASK; p < vaddr + len; p += PAGE_SIZE) - flush_page_for_dma(p); - } - - /* page color = pfn of page */ - ioptex = bit_map_string_get(&iommu->usemap, npages, pfn); - if (ioptex < 0) - panic("iommu out"); - busa0 = iommu->start + (ioptex << PAGE_SHIFT); - iopte0 = &iommu->page_table[ioptex]; - - busa = busa0; - iopte = iopte0; - for (i = 0; i < npages; i++) { - iopte_val(*iopte) = MKIOPTE(pfn, IOPERM); - iommu_invalidate_page(iommu->regs, busa); - busa += PAGE_SIZE; - iopte++; - pfn++; - } - - iommu_flush_iotlb(iopte0, npages); - return busa0 + off; -} - -static dma_addr_t sbus_iommu_map_page_gflush(struct device *dev, - struct page *page, unsigned long offset, size_t len, - enum dma_data_direction dir, unsigned long attrs) -{ - flush_page_for_dma(0); - return __sbus_iommu_map_page(dev, page, offset, len, false); -} - -static dma_addr_t sbus_iommu_map_page_pflush(struct device *dev, - struct page *page, unsigned long offset, size_t len, - enum dma_data_direction dir, unsigned long attrs) -{ - return __sbus_iommu_map_page(dev, page, offset, len, true); -} - -static int __sbus_iommu_map_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, unsigned long attrs, - bool per_page_flush) -{ - struct scatterlist *sg; - int j; - - for_each_sg(sgl, sg, nents, j) { - sg->dma_address =__sbus_iommu_map_page(dev, sg_page(sg), - sg->offset, sg->length, per_page_flush); - if (sg->dma_address == DMA_MAPPING_ERROR) - return -EIO; - sg->dma_length = sg->length; - } - - return nents; -} - -static int sbus_iommu_map_sg_gflush(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, unsigned long attrs) -{ - flush_page_for_dma(0); - return __sbus_iommu_map_sg(dev, sgl, nents, dir, attrs, false); -} - -static int sbus_iommu_map_sg_pflush(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, unsigned long attrs) -{ - return __sbus_iommu_map_sg(dev, sgl, nents, dir, attrs, true); -} - -static void sbus_iommu_unmap_page(struct device *dev, dma_addr_t dma_addr, - size_t len, enum dma_data_direction dir, unsigned long attrs) -{ - struct iommu_struct *iommu = dev->archdata.iommu; - unsigned int busa = dma_addr & PAGE_MASK; - unsigned long off = dma_addr & ~PAGE_MASK; - unsigned int npages = (off + len + PAGE_SIZE-1) >> PAGE_SHIFT; - unsigned int ioptex = (busa - iommu->start) >> PAGE_SHIFT; - unsigned int i; - - BUG_ON(busa < iommu->start); - for (i = 0; i < npages; i++) { - iopte_val(iommu->page_table[ioptex + i]) = 0; - iommu_invalidate_page(iommu->regs, busa); - busa += PAGE_SIZE; - } - bit_map_clear(&iommu->usemap, ioptex, npages); -} - -static void sbus_iommu_unmap_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sgl, sg, nents, i) { - sbus_iommu_unmap_page(dev, sg->dma_address, sg->length, dir, - attrs); - sg->dma_address = 0x21212121; - } -} - -#ifdef CONFIG_SBUS -static void *sbus_iommu_alloc(struct device *dev, size_t len, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) -{ - struct iommu_struct *iommu = dev->archdata.iommu; - unsigned long va, addr, page, end, ret; - iopte_t *iopte = iommu->page_table; - iopte_t *first; - int ioptex; - - /* XXX So what is maxphys for us and how do drivers know it? */ - if (!len || len > 256 * 1024) - return NULL; - - len = PAGE_ALIGN(len); - va = __get_free_pages(gfp | __GFP_ZERO, get_order(len)); - if (va == 0) - return NULL; - - addr = ret = sparc_dma_alloc_resource(dev, len); - if (!addr) - goto out_free_pages; - - BUG_ON((va & ~PAGE_MASK) != 0); - BUG_ON((addr & ~PAGE_MASK) != 0); - BUG_ON((len & ~PAGE_MASK) != 0); - - /* page color = physical address */ - ioptex = bit_map_string_get(&iommu->usemap, len >> PAGE_SHIFT, - addr >> PAGE_SHIFT); - if (ioptex < 0) - panic("iommu out"); - - iopte += ioptex; - first = iopte; - end = addr + len; - while(addr < end) { - page = va; - { - pmd_t *pmdp; - pte_t *ptep; - - __flush_page_to_ram(page); - - pmdp = pmd_off_k(addr); - ptep = pte_offset_kernel(pmdp, addr); - - set_pte(ptep, mk_pte(virt_to_page(page), dvma_prot)); - } - iopte_val(*iopte++) = - MKIOPTE(page_to_pfn(virt_to_page(page)), ioperm_noc); - addr += PAGE_SIZE; - va += PAGE_SIZE; - } - /* P3: why do we need this? - * - * DAVEM: Because there are several aspects, none of which - * are handled by a single interface. Some cpus are - * completely not I/O DMA coherent, and some have - * virtually indexed caches. The driver DMA flushing - * methods handle the former case, but here during - * IOMMU page table modifications, and usage of non-cacheable - * cpu mappings of pages potentially in the cpu caches, we have - * to handle the latter case as well. - */ - flush_cache_all(); - iommu_flush_iotlb(first, len >> PAGE_SHIFT); - flush_tlb_all(); - iommu_invalidate(iommu->regs); - - *dma_handle = iommu->start + (ioptex << PAGE_SHIFT); - return (void *)ret; - -out_free_pages: - free_pages(va, get_order(len)); - return NULL; -} - -static void sbus_iommu_free(struct device *dev, size_t len, void *cpu_addr, - dma_addr_t busa, unsigned long attrs) -{ - struct iommu_struct *iommu = dev->archdata.iommu; - iopte_t *iopte = iommu->page_table; - struct page *page = virt_to_page(cpu_addr); - int ioptex = (busa - iommu->start) >> PAGE_SHIFT; - unsigned long end; - - if (!sparc_dma_free_resource(cpu_addr, len)) - return; - - BUG_ON((busa & ~PAGE_MASK) != 0); - BUG_ON((len & ~PAGE_MASK) != 0); - - iopte += ioptex; - end = busa + len; - while (busa < end) { - iopte_val(*iopte++) = 0; - busa += PAGE_SIZE; - } - flush_tlb_all(); - iommu_invalidate(iommu->regs); - bit_map_clear(&iommu->usemap, ioptex, len >> PAGE_SHIFT); - - __free_pages(page, get_order(len)); -} -#endif - -static const struct dma_map_ops sbus_iommu_dma_gflush_ops = { -#ifdef CONFIG_SBUS - .alloc = sbus_iommu_alloc, - .free = sbus_iommu_free, -#endif - .map_page = sbus_iommu_map_page_gflush, - .unmap_page = sbus_iommu_unmap_page, - .map_sg = sbus_iommu_map_sg_gflush, - .unmap_sg = sbus_iommu_unmap_sg, -}; - -static const struct dma_map_ops sbus_iommu_dma_pflush_ops = { -#ifdef CONFIG_SBUS - .alloc = sbus_iommu_alloc, - .free = sbus_iommu_free, -#endif - .map_page = sbus_iommu_map_page_pflush, - .unmap_page = sbus_iommu_unmap_page, - .map_sg = sbus_iommu_map_sg_pflush, - .unmap_sg = sbus_iommu_unmap_sg, -}; - -void __init ld_mmu_iommu(void) -{ - dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV); - ioperm_noc = IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID; -} diff --git a/arch/sparc/mm/mm_32.h b/arch/sparc/mm/mm_32.h index 2c83b8ce742d..102e6a5162b0 100644 --- a/arch/sparc/mm/mm_32.h +++ b/arch/sparc/mm/mm_32.h @@ -14,6 +14,3 @@ extern int flush_page_for_dma_global; extern void (*poke_srmmu)(void); void __init srmmu_paging_init(void); - -/* iommu.c */ -void ld_mmu_iommu(void); diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c index 949247a6896b..dab71cd3fdb2 100644 --- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -1023,10 +1023,7 @@ void __init load_mmu(void) /* It really is const after this point. */ sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) &smp_cachetlb_ops; -#endif - ld_mmu_iommu(); -#ifdef CONFIG_SMP leon_init_smp(); #endif } -- 2.34.1