685 lines
17 KiB
C
685 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2012
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*
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* Author(s):
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/iommu-helper.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <linux/pci.h>
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#include <asm/pci_dma.h>
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static struct kmem_cache *dma_region_table_cache;
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static struct kmem_cache *dma_page_table_cache;
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static int s390_iommu_strict;
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static int zpci_refresh_global(struct zpci_dev *zdev)
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{
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return zpci_refresh_trans((u64) zdev->fh << 32, zdev->start_dma,
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zdev->iommu_pages * PAGE_SIZE);
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}
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unsigned long *dma_alloc_cpu_table(void)
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{
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unsigned long *table, *entry;
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table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
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if (!table)
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return NULL;
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for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
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*entry = ZPCI_TABLE_INVALID;
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return table;
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}
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static void dma_free_cpu_table(void *table)
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{
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kmem_cache_free(dma_region_table_cache, table);
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}
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static unsigned long *dma_alloc_page_table(void)
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{
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unsigned long *table, *entry;
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table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
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if (!table)
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return NULL;
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for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
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*entry = ZPCI_PTE_INVALID;
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return table;
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}
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static void dma_free_page_table(void *table)
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{
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kmem_cache_free(dma_page_table_cache, table);
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}
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static unsigned long *dma_get_seg_table_origin(unsigned long *entry)
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{
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unsigned long *sto;
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if (reg_entry_isvalid(*entry))
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sto = get_rt_sto(*entry);
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else {
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sto = dma_alloc_cpu_table();
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if (!sto)
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return NULL;
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set_rt_sto(entry, sto);
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validate_rt_entry(entry);
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entry_clr_protected(entry);
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}
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return sto;
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}
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static unsigned long *dma_get_page_table_origin(unsigned long *entry)
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{
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unsigned long *pto;
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if (reg_entry_isvalid(*entry))
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pto = get_st_pto(*entry);
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else {
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pto = dma_alloc_page_table();
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if (!pto)
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return NULL;
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set_st_pto(entry, pto);
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validate_st_entry(entry);
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entry_clr_protected(entry);
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}
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return pto;
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}
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unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
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{
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unsigned long *sto, *pto;
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unsigned int rtx, sx, px;
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rtx = calc_rtx(dma_addr);
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sto = dma_get_seg_table_origin(&rto[rtx]);
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if (!sto)
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return NULL;
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sx = calc_sx(dma_addr);
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pto = dma_get_page_table_origin(&sto[sx]);
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if (!pto)
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return NULL;
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px = calc_px(dma_addr);
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return &pto[px];
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}
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void dma_update_cpu_trans(unsigned long *entry, void *page_addr, int flags)
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{
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if (flags & ZPCI_PTE_INVALID) {
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invalidate_pt_entry(entry);
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} else {
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set_pt_pfaa(entry, page_addr);
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validate_pt_entry(entry);
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}
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if (flags & ZPCI_TABLE_PROTECTED)
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entry_set_protected(entry);
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else
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entry_clr_protected(entry);
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}
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static int __dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
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dma_addr_t dma_addr, size_t size, int flags)
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{
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unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
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u8 *page_addr = (u8 *) (pa & PAGE_MASK);
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unsigned long irq_flags;
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unsigned long *entry;
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int i, rc = 0;
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if (!nr_pages)
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return -EINVAL;
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spin_lock_irqsave(&zdev->dma_table_lock, irq_flags);
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if (!zdev->dma_table) {
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rc = -EINVAL;
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goto out_unlock;
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}
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for (i = 0; i < nr_pages; i++) {
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entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
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if (!entry) {
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rc = -ENOMEM;
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goto undo_cpu_trans;
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}
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dma_update_cpu_trans(entry, page_addr, flags);
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page_addr += PAGE_SIZE;
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dma_addr += PAGE_SIZE;
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}
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undo_cpu_trans:
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if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID)) {
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flags = ZPCI_PTE_INVALID;
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while (i-- > 0) {
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page_addr -= PAGE_SIZE;
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dma_addr -= PAGE_SIZE;
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entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
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if (!entry)
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break;
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dma_update_cpu_trans(entry, page_addr, flags);
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}
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}
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out_unlock:
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spin_unlock_irqrestore(&zdev->dma_table_lock, irq_flags);
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return rc;
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}
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static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr,
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size_t size, int flags)
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{
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unsigned long irqflags;
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int ret;
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/*
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* With zdev->tlb_refresh == 0, rpcit is not required to establish new
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* translations when previously invalid translation-table entries are
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* validated. With lazy unmap, rpcit is skipped for previously valid
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* entries, but a global rpcit is then required before any address can
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* be re-used, i.e. after each iommu bitmap wrap-around.
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*/
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if ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID) {
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if (!zdev->tlb_refresh)
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return 0;
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} else {
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if (!s390_iommu_strict)
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return 0;
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}
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ret = zpci_refresh_trans((u64) zdev->fh << 32, dma_addr,
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PAGE_ALIGN(size));
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if (ret == -ENOMEM && !s390_iommu_strict) {
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/* enable the hypervisor to free some resources */
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if (zpci_refresh_global(zdev))
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goto out;
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spin_lock_irqsave(&zdev->iommu_bitmap_lock, irqflags);
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bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
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zdev->lazy_bitmap, zdev->iommu_pages);
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bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
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spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, irqflags);
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ret = 0;
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}
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out:
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return ret;
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}
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static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
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dma_addr_t dma_addr, size_t size, int flags)
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{
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int rc;
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rc = __dma_update_trans(zdev, pa, dma_addr, size, flags);
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if (rc)
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return rc;
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rc = __dma_purge_tlb(zdev, dma_addr, size, flags);
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if (rc && ((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))
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__dma_update_trans(zdev, pa, dma_addr, size, ZPCI_PTE_INVALID);
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return rc;
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}
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void dma_free_seg_table(unsigned long entry)
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{
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unsigned long *sto = get_rt_sto(entry);
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int sx;
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for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
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if (reg_entry_isvalid(sto[sx]))
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dma_free_page_table(get_st_pto(sto[sx]));
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dma_free_cpu_table(sto);
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}
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void dma_cleanup_tables(unsigned long *table)
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{
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int rtx;
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if (!table)
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return;
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for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
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if (reg_entry_isvalid(table[rtx]))
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dma_free_seg_table(table[rtx]);
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dma_free_cpu_table(table);
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}
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static unsigned long __dma_alloc_iommu(struct device *dev,
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unsigned long start, int size)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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unsigned long boundary_size;
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boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
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PAGE_SIZE) >> PAGE_SHIFT;
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return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
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start, size, zdev->start_dma >> PAGE_SHIFT,
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boundary_size, 0);
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}
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static dma_addr_t dma_alloc_address(struct device *dev, int size)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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unsigned long offset, flags;
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spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
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offset = __dma_alloc_iommu(dev, zdev->next_bit, size);
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if (offset == -1) {
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if (!s390_iommu_strict) {
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/* global flush before DMA addresses are reused */
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if (zpci_refresh_global(zdev))
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goto out_error;
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bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
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zdev->lazy_bitmap, zdev->iommu_pages);
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bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
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}
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/* wrap-around */
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offset = __dma_alloc_iommu(dev, 0, size);
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if (offset == -1)
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goto out_error;
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}
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zdev->next_bit = offset + size;
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spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
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return zdev->start_dma + offset * PAGE_SIZE;
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out_error:
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spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
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return DMA_MAPPING_ERROR;
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}
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static void dma_free_address(struct device *dev, dma_addr_t dma_addr, int size)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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unsigned long flags, offset;
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offset = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
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spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
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if (!zdev->iommu_bitmap)
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goto out;
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if (s390_iommu_strict)
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bitmap_clear(zdev->iommu_bitmap, offset, size);
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else
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bitmap_set(zdev->lazy_bitmap, offset, size);
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out:
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spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
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}
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static inline void zpci_err_dma(unsigned long rc, unsigned long addr)
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{
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struct {
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unsigned long rc;
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unsigned long addr;
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} __packed data = {rc, addr};
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zpci_err_hex(&data, sizeof(data));
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}
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static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction direction,
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unsigned long attrs)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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unsigned long pa = page_to_phys(page) + offset;
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int flags = ZPCI_PTE_VALID;
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unsigned long nr_pages;
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dma_addr_t dma_addr;
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int ret;
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/* This rounds up number of pages based on size and offset */
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nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
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dma_addr = dma_alloc_address(dev, nr_pages);
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if (dma_addr == DMA_MAPPING_ERROR) {
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ret = -ENOSPC;
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goto out_err;
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}
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/* Use rounded up size */
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size = nr_pages * PAGE_SIZE;
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if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
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flags |= ZPCI_TABLE_PROTECTED;
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ret = dma_update_trans(zdev, pa, dma_addr, size, flags);
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if (ret)
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goto out_free;
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atomic64_add(nr_pages, &zdev->mapped_pages);
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return dma_addr + (offset & ~PAGE_MASK);
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out_free:
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dma_free_address(dev, dma_addr, nr_pages);
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out_err:
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zpci_err("map error:\n");
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zpci_err_dma(ret, pa);
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return DMA_MAPPING_ERROR;
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}
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static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
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size_t size, enum dma_data_direction direction,
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unsigned long attrs)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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int npages, ret;
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npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
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dma_addr = dma_addr & PAGE_MASK;
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ret = dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
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ZPCI_PTE_INVALID);
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if (ret) {
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zpci_err("unmap error:\n");
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zpci_err_dma(ret, dma_addr);
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return;
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}
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atomic64_add(npages, &zdev->unmapped_pages);
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dma_free_address(dev, dma_addr, npages);
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}
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static void *s390_dma_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag,
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unsigned long attrs)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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struct page *page;
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unsigned long pa;
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dma_addr_t map;
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size = PAGE_ALIGN(size);
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page = alloc_pages(flag | __GFP_ZERO, get_order(size));
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if (!page)
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return NULL;
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pa = page_to_phys(page);
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map = s390_dma_map_pages(dev, page, 0, size, DMA_BIDIRECTIONAL, 0);
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if (dma_mapping_error(dev, map)) {
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free_pages(pa, get_order(size));
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return NULL;
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}
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atomic64_add(size / PAGE_SIZE, &zdev->allocated_pages);
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if (dma_handle)
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*dma_handle = map;
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return (void *) pa;
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}
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static void s390_dma_free(struct device *dev, size_t size,
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void *pa, dma_addr_t dma_handle,
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unsigned long attrs)
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{
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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size = PAGE_ALIGN(size);
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atomic64_sub(size / PAGE_SIZE, &zdev->allocated_pages);
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s390_dma_unmap_pages(dev, dma_handle, size, DMA_BIDIRECTIONAL, 0);
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free_pages((unsigned long) pa, get_order(size));
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}
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/* Map a segment into a contiguous dma address area */
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static int __s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
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size_t size, dma_addr_t *handle,
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enum dma_data_direction dir)
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{
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unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
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struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
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dma_addr_t dma_addr_base, dma_addr;
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int flags = ZPCI_PTE_VALID;
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struct scatterlist *s;
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unsigned long pa = 0;
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int ret;
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dma_addr_base = dma_alloc_address(dev, nr_pages);
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if (dma_addr_base == DMA_MAPPING_ERROR)
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return -ENOMEM;
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dma_addr = dma_addr_base;
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if (dir == DMA_NONE || dir == DMA_TO_DEVICE)
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flags |= ZPCI_TABLE_PROTECTED;
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for (s = sg; dma_addr < dma_addr_base + size; s = sg_next(s)) {
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pa = page_to_phys(sg_page(s));
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ret = __dma_update_trans(zdev, pa, dma_addr,
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s->offset + s->length, flags);
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if (ret)
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goto unmap;
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dma_addr += s->offset + s->length;
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}
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ret = __dma_purge_tlb(zdev, dma_addr_base, size, flags);
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if (ret)
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goto unmap;
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*handle = dma_addr_base;
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atomic64_add(nr_pages, &zdev->mapped_pages);
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return ret;
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unmap:
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dma_update_trans(zdev, 0, dma_addr_base, dma_addr - dma_addr_base,
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ZPCI_PTE_INVALID);
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dma_free_address(dev, dma_addr_base, nr_pages);
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zpci_err("map error:\n");
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zpci_err_dma(ret, pa);
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return ret;
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}
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static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
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int nr_elements, enum dma_data_direction dir,
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unsigned long attrs)
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{
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struct scatterlist *s = sg, *start = sg, *dma = sg;
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unsigned int max = dma_get_max_seg_size(dev);
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unsigned int size = s->offset + s->length;
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unsigned int offset = s->offset;
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int count = 0, i;
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for (i = 1; i < nr_elements; i++) {
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s = sg_next(s);
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s->dma_address = DMA_MAPPING_ERROR;
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s->dma_length = 0;
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if (s->offset || (size & ~PAGE_MASK) ||
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size + s->length > max) {
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if (__s390_dma_map_sg(dev, start, size,
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&dma->dma_address, dir))
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goto unmap;
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dma->dma_address += offset;
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dma->dma_length = size - offset;
|
|
|
|
size = offset = s->offset;
|
|
start = s;
|
|
dma = sg_next(dma);
|
|
count++;
|
|
}
|
|
size += s->length;
|
|
}
|
|
if (__s390_dma_map_sg(dev, start, size, &dma->dma_address, dir))
|
|
goto unmap;
|
|
|
|
dma->dma_address += offset;
|
|
dma->dma_length = size - offset;
|
|
|
|
return count + 1;
|
|
unmap:
|
|
for_each_sg(sg, s, count, i)
|
|
s390_dma_unmap_pages(dev, sg_dma_address(s), sg_dma_len(s),
|
|
dir, attrs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
|
|
int nr_elements, enum dma_data_direction dir,
|
|
unsigned long attrs)
|
|
{
|
|
struct scatterlist *s;
|
|
int i;
|
|
|
|
for_each_sg(sg, s, nr_elements, i) {
|
|
if (s->dma_length)
|
|
s390_dma_unmap_pages(dev, s->dma_address, s->dma_length,
|
|
dir, attrs);
|
|
s->dma_address = 0;
|
|
s->dma_length = 0;
|
|
}
|
|
}
|
|
|
|
int zpci_dma_init_device(struct zpci_dev *zdev)
|
|
{
|
|
int rc;
|
|
|
|
/*
|
|
* At this point, if the device is part of an IOMMU domain, this would
|
|
* be a strong hint towards a bug in the IOMMU API (common) code and/or
|
|
* simultaneous access via IOMMU and DMA API. So let's issue a warning.
|
|
*/
|
|
WARN_ON(zdev->s390_domain);
|
|
|
|
spin_lock_init(&zdev->iommu_bitmap_lock);
|
|
spin_lock_init(&zdev->dma_table_lock);
|
|
|
|
zdev->dma_table = dma_alloc_cpu_table();
|
|
if (!zdev->dma_table) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Restrict the iommu bitmap size to the minimum of the following:
|
|
* - main memory size
|
|
* - 3-level pagetable address limit minus start_dma offset
|
|
* - DMA address range allowed by the hardware (clp query pci fn)
|
|
*
|
|
* Also set zdev->end_dma to the actual end address of the usable
|
|
* range, instead of the theoretical maximum as reported by hardware.
|
|
*/
|
|
zdev->start_dma = PAGE_ALIGN(zdev->start_dma);
|
|
zdev->iommu_size = min3((u64) high_memory,
|
|
ZPCI_TABLE_SIZE_RT - zdev->start_dma,
|
|
zdev->end_dma - zdev->start_dma + 1);
|
|
zdev->end_dma = zdev->start_dma + zdev->iommu_size - 1;
|
|
zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT;
|
|
zdev->iommu_bitmap = vzalloc(zdev->iommu_pages / 8);
|
|
if (!zdev->iommu_bitmap) {
|
|
rc = -ENOMEM;
|
|
goto free_dma_table;
|
|
}
|
|
if (!s390_iommu_strict) {
|
|
zdev->lazy_bitmap = vzalloc(zdev->iommu_pages / 8);
|
|
if (!zdev->lazy_bitmap) {
|
|
rc = -ENOMEM;
|
|
goto free_bitmap;
|
|
}
|
|
|
|
}
|
|
rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
|
|
(u64) zdev->dma_table);
|
|
if (rc)
|
|
goto free_bitmap;
|
|
|
|
return 0;
|
|
free_bitmap:
|
|
vfree(zdev->iommu_bitmap);
|
|
zdev->iommu_bitmap = NULL;
|
|
vfree(zdev->lazy_bitmap);
|
|
zdev->lazy_bitmap = NULL;
|
|
free_dma_table:
|
|
dma_free_cpu_table(zdev->dma_table);
|
|
zdev->dma_table = NULL;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
void zpci_dma_exit_device(struct zpci_dev *zdev)
|
|
{
|
|
/*
|
|
* At this point, if the device is part of an IOMMU domain, this would
|
|
* be a strong hint towards a bug in the IOMMU API (common) code and/or
|
|
* simultaneous access via IOMMU and DMA API. So let's issue a warning.
|
|
*/
|
|
WARN_ON(zdev->s390_domain);
|
|
|
|
if (zpci_unregister_ioat(zdev, 0))
|
|
return;
|
|
|
|
dma_cleanup_tables(zdev->dma_table);
|
|
zdev->dma_table = NULL;
|
|
vfree(zdev->iommu_bitmap);
|
|
zdev->iommu_bitmap = NULL;
|
|
vfree(zdev->lazy_bitmap);
|
|
zdev->lazy_bitmap = NULL;
|
|
|
|
zdev->next_bit = 0;
|
|
}
|
|
|
|
static int __init dma_alloc_cpu_table_caches(void)
|
|
{
|
|
dma_region_table_cache = kmem_cache_create("PCI_DMA_region_tables",
|
|
ZPCI_TABLE_SIZE, ZPCI_TABLE_ALIGN,
|
|
0, NULL);
|
|
if (!dma_region_table_cache)
|
|
return -ENOMEM;
|
|
|
|
dma_page_table_cache = kmem_cache_create("PCI_DMA_page_tables",
|
|
ZPCI_PT_SIZE, ZPCI_PT_ALIGN,
|
|
0, NULL);
|
|
if (!dma_page_table_cache) {
|
|
kmem_cache_destroy(dma_region_table_cache);
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int __init zpci_dma_init(void)
|
|
{
|
|
return dma_alloc_cpu_table_caches();
|
|
}
|
|
|
|
void zpci_dma_exit(void)
|
|
{
|
|
kmem_cache_destroy(dma_page_table_cache);
|
|
kmem_cache_destroy(dma_region_table_cache);
|
|
}
|
|
|
|
const struct dma_map_ops s390_pci_dma_ops = {
|
|
.alloc = s390_dma_alloc,
|
|
.free = s390_dma_free,
|
|
.map_sg = s390_dma_map_sg,
|
|
.unmap_sg = s390_dma_unmap_sg,
|
|
.map_page = s390_dma_map_pages,
|
|
.unmap_page = s390_dma_unmap_pages,
|
|
.mmap = dma_common_mmap,
|
|
.get_sgtable = dma_common_get_sgtable,
|
|
/* dma_supported is unconditionally true without a callback */
|
|
};
|
|
EXPORT_SYMBOL_GPL(s390_pci_dma_ops);
|
|
|
|
static int __init s390_iommu_setup(char *str)
|
|
{
|
|
if (!strcmp(str, "strict"))
|
|
s390_iommu_strict = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("s390_iommu=", s390_iommu_setup);
|