linux/arch/sparc/mm/iommu.c

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License cleanup: add SPDX GPL-2.0 license identifier to files with no license Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 14:07:57 +00:00
// 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 <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/highmem.h> /* pte_offset_map => kmap_atomic */
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/mxcc.h>
#include <asm/mbus.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/bitext.h>
#include <asm/iommu.h>
#include <asm/dma.h>
#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) */
static int viking_flush;
/* viking.S */
extern void viking_flush_page(unsigned long page);
extern void viking_mxcc_flush_page(unsigned long page);
/*
* 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 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);
/* To be coherent on HyperSparc, the page color of DVMA
* and physical addresses must match.
*/
if (srmmu_modtype == HyperSparc)
iommu->usemap.num_colors = vac_cache_size >> PAGE_SHIFT;
else
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;
}
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;
if (viking_mxcc_present) {
while(start < end) {
viking_mxcc_flush_page(start);
start += PAGE_SIZE;
}
} else if (viking_flush) {
while(start < end) {
viking_flush_page(start);
start += PAGE_SIZE;
}
} else {
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 0;
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;
{
pgd_t *pgdp;
pmd_t *pmdp;
pte_t *ptep;
if (viking_mxcc_present)
viking_mxcc_flush_page(page);
else if (viking_flush)
viking_flush_page(page);
else
__flush_page_to_ram(page);
pgdp = pgd_offset(&init_mm, addr);
pmdp = pmd_offset(pgdp, addr);
ptep = pte_offset_map(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)
{
if (flush_page_for_dma_global) {
/* flush_page_for_dma flushes everything, no matter of what page is it */
dma_ops = &sbus_iommu_dma_gflush_ops;
} else {
dma_ops = &sbus_iommu_dma_pflush_ops;
}
if (viking_mxcc_present || srmmu_modtype == HyperSparc) {
dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
ioperm_noc = IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID;
} else {
dvma_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV);
ioperm_noc = IOPTE_WRITE | IOPTE_VALID;
}
}