Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
new file mode 100644
index 0000000..489bf68
--- /dev/null
+++ b/arch/sparc/mm/iommu.c
@@ -0,0 +1,475 @@
+/*
+ * 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/config.h>
+#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 <asm/scatterlist.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/sbus.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>
+
+/*
+ * 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, 265KB */
+#define IOMMU_ORDER 6 /* 4096 * (1<<6) */
+
+/* srmmu.c */
+extern int viking_mxcc_present;
+BTFIXUPDEF_CALL(void, flush_page_for_dma, unsigned long)
+#define flush_page_for_dma(page) BTFIXUP_CALL(flush_page_for_dma)(page)
+extern int flush_page_for_dma_global;
+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)
+
+void __init
+iommu_init(int iommund, struct sbus_bus *sbus)
+{
+ unsigned int impl, vers;
+ unsigned long tmp;
+ struct iommu_struct *iommu;
+ struct linux_prom_registers iommu_promregs[PROMREG_MAX];
+ struct resource r;
+ unsigned long *bitmap;
+
+ iommu = kmalloc(sizeof(struct iommu_struct), GFP_ATOMIC);
+ if (!iommu) {
+ prom_printf("Unable to allocate iommu structure\n");
+ prom_halt();
+ }
+ iommu->regs = NULL;
+ if (prom_getproperty(iommund, "reg", (void *) iommu_promregs,
+ sizeof(iommu_promregs)) != -1) {
+ memset(&r, 0, sizeof(r));
+ r.flags = iommu_promregs[0].which_io;
+ r.start = iommu_promregs[0].phys_addr;
+ iommu->regs = (struct iommu_regs *)
+ sbus_ioremap(&r, 0, PAGE_SIZE * 3, "iommu_regs");
+ }
+ if (!iommu->regs) {
+ prom_printf("Cannot map IOMMU registers\n");
+ prom_halt();
+ }
+ impl = (iommu->regs->control & IOMMU_CTRL_IMPL) >> 28;
+ vers = (iommu->regs->control & IOMMU_CTRL_VERS) >> 24;
+ tmp = iommu->regs->control;
+ tmp &= ~(IOMMU_CTRL_RNGE);
+ tmp |= (IOMMU_RNGE_256MB | IOMMU_CTRL_ENAB);
+ iommu->regs->control = tmp;
+ 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%08x]\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();
+ iommu->regs->base = __pa((unsigned long) iommu->page_table) >> 4;
+ 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("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);
+
+ sbus->iommu = iommu;
+}
+
+/* This begs to be btfixup-ed by srmmu. */
+/* 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 & PAGE_MASK;
+ end = PAGE_ALIGN(start + niopte*sizeof(iopte_t));
+ 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 u32 iommu_get_one(struct page *page, int npages, struct sbus_bus *sbus)
+{
+ struct iommu_struct *iommu = sbus->iommu;
+ int ioptex;
+ iopte_t *iopte, *iopte0;
+ unsigned int busa, busa0;
+ int i;
+
+ /* page color = pfn of page */
+ ioptex = bit_map_string_get(&iommu->usemap, npages, page_to_pfn(page));
+ 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(page_to_pfn(page), IOPERM);
+ iommu_invalidate_page(iommu->regs, busa);
+ busa += PAGE_SIZE;
+ iopte++;
+ page++;
+ }
+
+ iommu_flush_iotlb(iopte0, npages);
+
+ return busa0;
+}
+
+static u32 iommu_get_scsi_one(char *vaddr, unsigned int len,
+ struct sbus_bus *sbus)
+{
+ unsigned long off;
+ int npages;
+ struct page *page;
+ u32 busa;
+
+ off = (unsigned long)vaddr & ~PAGE_MASK;
+ npages = (off + len + PAGE_SIZE-1) >> PAGE_SHIFT;
+ page = virt_to_page((unsigned long)vaddr & PAGE_MASK);
+ busa = iommu_get_one(page, npages, sbus);
+ return busa + off;
+}
+
+static __u32 iommu_get_scsi_one_noflush(char *vaddr, unsigned long len, struct sbus_bus *sbus)
+{
+ return iommu_get_scsi_one(vaddr, len, sbus);
+}
+
+static __u32 iommu_get_scsi_one_gflush(char *vaddr, unsigned long len, struct sbus_bus *sbus)
+{
+ flush_page_for_dma(0);
+ return iommu_get_scsi_one(vaddr, len, sbus);
+}
+
+static __u32 iommu_get_scsi_one_pflush(char *vaddr, unsigned long len, struct sbus_bus *sbus)
+{
+ unsigned long page = ((unsigned long) vaddr) & PAGE_MASK;
+
+ while(page < ((unsigned long)(vaddr + len))) {
+ flush_page_for_dma(page);
+ page += PAGE_SIZE;
+ }
+ return iommu_get_scsi_one(vaddr, len, sbus);
+}
+
+static void iommu_get_scsi_sgl_noflush(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
+{
+ int n;
+
+ while (sz != 0) {
+ --sz;
+ n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
+ sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;
+ sg->dvma_length = (__u32) sg->length;
+ sg++;
+ }
+}
+
+static void iommu_get_scsi_sgl_gflush(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
+{
+ int n;
+
+ flush_page_for_dma(0);
+ while (sz != 0) {
+ --sz;
+ n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
+ sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;
+ sg->dvma_length = (__u32) sg->length;
+ sg++;
+ }
+}
+
+static void iommu_get_scsi_sgl_pflush(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
+{
+ unsigned long page, oldpage = 0;
+ int n, i;
+
+ while(sz != 0) {
+ --sz;
+
+ n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
+
+ /*
+ * 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 ((page = (unsigned long) page_address(sg->page)) != 0) {
+ for (i = 0; i < n; i++) {
+ if (page != oldpage) { /* Already flushed? */
+ flush_page_for_dma(page);
+ oldpage = page;
+ }
+ page += PAGE_SIZE;
+ }
+ }
+
+ sg->dvma_address = iommu_get_one(sg->page, n, sbus) + sg->offset;
+ sg->dvma_length = (__u32) sg->length;
+ sg++;
+ }
+}
+
+static void iommu_release_one(u32 busa, int npages, struct sbus_bus *sbus)
+{
+ struct iommu_struct *iommu = sbus->iommu;
+ int ioptex;
+ int i;
+
+ if (busa < iommu->start)
+ BUG();
+ ioptex = (busa - iommu->start) >> PAGE_SHIFT;
+ 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 iommu_release_scsi_one(__u32 vaddr, unsigned long len, struct sbus_bus *sbus)
+{
+ unsigned long off;
+ int npages;
+
+ off = vaddr & ~PAGE_MASK;
+ npages = (off + len + PAGE_SIZE-1) >> PAGE_SHIFT;
+ iommu_release_one(vaddr & PAGE_MASK, npages, sbus);
+}
+
+static void iommu_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
+{
+ int n;
+
+ while(sz != 0) {
+ --sz;
+
+ n = (sg->length + sg->offset + PAGE_SIZE-1) >> PAGE_SHIFT;
+ iommu_release_one(sg->dvma_address & PAGE_MASK, n, sbus);
+ sg->dvma_address = 0x21212121;
+ sg++;
+ }
+}
+
+#ifdef CONFIG_SBUS
+static int iommu_map_dma_area(dma_addr_t *pba, unsigned long va,
+ unsigned long addr, int len)
+{
+ unsigned long page, end;
+ struct iommu_struct *iommu = sbus_root->iommu;
+ iopte_t *iopte = iommu->page_table;
+ iopte_t *first;
+ int ioptex;
+
+ if ((va & ~PAGE_MASK) != 0) BUG();
+ if ((addr & ~PAGE_MASK) != 0) BUG();
+ if ((len & ~PAGE_MASK) != 0) BUG();
+
+ /* 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);
+
+ *pba = iommu->start + (ioptex << PAGE_SHIFT);
+ return 0;
+}
+
+static void iommu_unmap_dma_area(unsigned long busa, int len)
+{
+ struct iommu_struct *iommu = sbus_root->iommu;
+ iopte_t *iopte = iommu->page_table;
+ unsigned long end;
+ int ioptex = (busa - iommu->start) >> PAGE_SHIFT;
+
+ if ((busa & ~PAGE_MASK) != 0) BUG();
+ if ((len & ~PAGE_MASK) != 0) BUG();
+
+ 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);
+}
+
+static struct page *iommu_translate_dvma(unsigned long busa)
+{
+ struct iommu_struct *iommu = sbus_root->iommu;
+ iopte_t *iopte = iommu->page_table;
+
+ iopte += ((busa - iommu->start) >> PAGE_SHIFT);
+ return pfn_to_page((iopte_val(*iopte) & IOPTE_PAGE) >> (PAGE_SHIFT-4));
+}
+#endif
+
+static char *iommu_lockarea(char *vaddr, unsigned long len)
+{
+ return vaddr;
+}
+
+static void iommu_unlockarea(char *vaddr, unsigned long len)
+{
+}
+
+void __init ld_mmu_iommu(void)
+{
+ viking_flush = (BTFIXUPVAL_CALL(flush_page_for_dma) == (unsigned long)viking_flush_page);
+ BTFIXUPSET_CALL(mmu_lockarea, iommu_lockarea, BTFIXUPCALL_RETO0);
+ BTFIXUPSET_CALL(mmu_unlockarea, iommu_unlockarea, BTFIXUPCALL_NOP);
+
+ if (!BTFIXUPVAL_CALL(flush_page_for_dma)) {
+ /* IO coherent chip */
+ BTFIXUPSET_CALL(mmu_get_scsi_one, iommu_get_scsi_one_noflush, BTFIXUPCALL_RETO0);
+ BTFIXUPSET_CALL(mmu_get_scsi_sgl, iommu_get_scsi_sgl_noflush, BTFIXUPCALL_NORM);
+ } else if (flush_page_for_dma_global) {
+ /* flush_page_for_dma flushes everything, no matter of what page is it */
+ BTFIXUPSET_CALL(mmu_get_scsi_one, iommu_get_scsi_one_gflush, BTFIXUPCALL_NORM);
+ BTFIXUPSET_CALL(mmu_get_scsi_sgl, iommu_get_scsi_sgl_gflush, BTFIXUPCALL_NORM);
+ } else {
+ BTFIXUPSET_CALL(mmu_get_scsi_one, iommu_get_scsi_one_pflush, BTFIXUPCALL_NORM);
+ BTFIXUPSET_CALL(mmu_get_scsi_sgl, iommu_get_scsi_sgl_pflush, BTFIXUPCALL_NORM);
+ }
+ BTFIXUPSET_CALL(mmu_release_scsi_one, iommu_release_scsi_one, BTFIXUPCALL_NORM);
+ BTFIXUPSET_CALL(mmu_release_scsi_sgl, iommu_release_scsi_sgl, BTFIXUPCALL_NORM);
+
+#ifdef CONFIG_SBUS
+ BTFIXUPSET_CALL(mmu_map_dma_area, iommu_map_dma_area, BTFIXUPCALL_NORM);
+ BTFIXUPSET_CALL(mmu_unmap_dma_area, iommu_unmap_dma_area, BTFIXUPCALL_NORM);
+ BTFIXUPSET_CALL(mmu_translate_dvma, iommu_translate_dvma, BTFIXUPCALL_NORM);
+#endif
+
+ 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;
+ }
+}