forked from Minki/linux
s390/pci: DMA support
Add DMA IOMMU support using 4K page table entries. Implement dma_map_ops. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber
Martin Schwidefsky
parent
9a4da8a5b1
commit
828b35f60e
76
arch/s390/include/asm/dma-mapping.h
Normal file
76
arch/s390/include/asm/dma-mapping.h
Normal file
@ -0,0 +1,76 @@
|
||||
#ifndef _ASM_S390_DMA_MAPPING_H
|
||||
#define _ASM_S390_DMA_MAPPING_H
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/dma-attrs.h>
|
||||
#include <linux/dma-debug.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
#define DMA_ERROR_CODE (~(dma_addr_t) 0x0)
|
||||
|
||||
extern struct dma_map_ops s390_dma_ops;
|
||||
|
||||
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
|
||||
{
|
||||
return &s390_dma_ops;
|
||||
}
|
||||
|
||||
extern int dma_set_mask(struct device *dev, u64 mask);
|
||||
extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
|
||||
extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
|
||||
enum dma_data_direction direction);
|
||||
|
||||
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
|
||||
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
|
||||
|
||||
#include <asm-generic/dma-mapping-common.h>
|
||||
|
||||
static inline int dma_supported(struct device *dev, u64 mask)
|
||||
{
|
||||
struct dma_map_ops *dma_ops = get_dma_ops(dev);
|
||||
|
||||
if (dma_ops->dma_supported == NULL)
|
||||
return 1;
|
||||
return dma_ops->dma_supported(dev, mask);
|
||||
}
|
||||
|
||||
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
|
||||
{
|
||||
if (!dev->dma_mask)
|
||||
return 0;
|
||||
return addr + size - 1 <= *dev->dma_mask;
|
||||
}
|
||||
|
||||
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
||||
{
|
||||
struct dma_map_ops *dma_ops = get_dma_ops(dev);
|
||||
|
||||
if (dma_ops->mapping_error)
|
||||
return dma_ops->mapping_error(dev, dma_addr);
|
||||
return (dma_addr == 0UL);
|
||||
}
|
||||
|
||||
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
|
||||
dma_addr_t *dma_handle, gfp_t flag)
|
||||
{
|
||||
struct dma_map_ops *ops = get_dma_ops(dev);
|
||||
void *ret;
|
||||
|
||||
ret = ops->alloc(dev, size, dma_handle, flag, NULL);
|
||||
debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline void dma_free_coherent(struct device *dev, size_t size,
|
||||
void *cpu_addr, dma_addr_t dma_handle)
|
||||
{
|
||||
struct dma_map_ops *dma_ops = get_dma_ops(dev);
|
||||
|
||||
dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
|
||||
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
|
||||
}
|
||||
|
||||
#endif /* _ASM_S390_DMA_MAPPING_H */
|
||||
@ -1,14 +1,13 @@
|
||||
#ifndef _ASM_S390_DMA_H
|
||||
#define _ASM_S390_DMA_H
|
||||
|
||||
#include <asm/io.h>
|
||||
|
||||
/*
|
||||
* S390 version
|
||||
* MAX_DMA_ADDRESS is ambiguous because on s390 its completely unrelated
|
||||
* to DMA. It _is_ used for the s390 memory zone split at 2GB caused
|
||||
* by the 31 bit heritage.
|
||||
*/
|
||||
|
||||
#ifndef _ASM_DMA_H
|
||||
#define _ASM_DMA_H
|
||||
|
||||
#include <asm/io.h> /* need byte IO */
|
||||
|
||||
#define MAX_DMA_ADDRESS 0x80000000
|
||||
|
||||
#define free_dma(x) do { } while (0)
|
||||
|
||||
#endif /* _ASM_DMA_H */
|
||||
#endif /* _ASM_S390_DMA_H */
|
||||
|
||||
@ -75,8 +75,23 @@ struct zpci_dev {
|
||||
struct msi_map *msi_map[ZPCI_NR_MSI_VECS];
|
||||
unsigned int aisb; /* number of the summary bit */
|
||||
|
||||
/* DMA stuff */
|
||||
unsigned long *dma_table;
|
||||
spinlock_t dma_table_lock;
|
||||
int tlb_refresh;
|
||||
|
||||
spinlock_t iommu_bitmap_lock;
|
||||
unsigned long *iommu_bitmap;
|
||||
unsigned long iommu_size;
|
||||
unsigned long iommu_pages;
|
||||
unsigned int next_bit;
|
||||
|
||||
struct zpci_bar_struct bars[PCI_BAR_COUNT];
|
||||
|
||||
u64 start_dma; /* Start of available DMA addresses */
|
||||
u64 end_dma; /* End of available DMA addresses */
|
||||
u64 dma_mask; /* DMA address space mask */
|
||||
|
||||
enum pci_bus_speed max_bus_speed;
|
||||
};
|
||||
|
||||
@ -95,6 +110,8 @@ int zpci_enable_device(struct zpci_dev *);
|
||||
void zpci_stop_device(struct zpci_dev *);
|
||||
void zpci_free_device(struct zpci_dev *);
|
||||
int zpci_scan_device(struct zpci_dev *);
|
||||
int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
|
||||
int zpci_unregister_ioat(struct zpci_dev *, u8);
|
||||
|
||||
/* CLP */
|
||||
int clp_find_pci_devices(void);
|
||||
@ -115,4 +132,8 @@ struct zpci_dev *get_zdev(struct pci_dev *);
|
||||
struct zpci_dev *get_zdev_by_fid(u32);
|
||||
bool zpci_fid_present(u32);
|
||||
|
||||
/* DMA */
|
||||
int zpci_dma_init(void);
|
||||
void zpci_dma_exit(void);
|
||||
|
||||
#endif
|
||||
|
||||
196
arch/s390/include/asm/pci_dma.h
Normal file
196
arch/s390/include/asm/pci_dma.h
Normal file
@ -0,0 +1,196 @@
|
||||
#ifndef _ASM_S390_PCI_DMA_H
|
||||
#define _ASM_S390_PCI_DMA_H
|
||||
|
||||
/* I/O Translation Anchor (IOTA) */
|
||||
enum zpci_ioat_dtype {
|
||||
ZPCI_IOTA_STO = 0,
|
||||
ZPCI_IOTA_RTTO = 1,
|
||||
ZPCI_IOTA_RSTO = 2,
|
||||
ZPCI_IOTA_RFTO = 3,
|
||||
ZPCI_IOTA_PFAA = 4,
|
||||
ZPCI_IOTA_IOPFAA = 5,
|
||||
ZPCI_IOTA_IOPTO = 7
|
||||
};
|
||||
|
||||
#define ZPCI_IOTA_IOT_ENABLED 0x800UL
|
||||
#define ZPCI_IOTA_DT_ST (ZPCI_IOTA_STO << 2)
|
||||
#define ZPCI_IOTA_DT_RT (ZPCI_IOTA_RTTO << 2)
|
||||
#define ZPCI_IOTA_DT_RS (ZPCI_IOTA_RSTO << 2)
|
||||
#define ZPCI_IOTA_DT_RF (ZPCI_IOTA_RFTO << 2)
|
||||
#define ZPCI_IOTA_DT_PF (ZPCI_IOTA_PFAA << 2)
|
||||
#define ZPCI_IOTA_FS_4K 0
|
||||
#define ZPCI_IOTA_FS_1M 1
|
||||
#define ZPCI_IOTA_FS_2G 2
|
||||
#define ZPCI_KEY (PAGE_DEFAULT_KEY << 5)
|
||||
|
||||
#define ZPCI_IOTA_STO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_ST)
|
||||
#define ZPCI_IOTA_RTTO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RT)
|
||||
#define ZPCI_IOTA_RSTO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RS)
|
||||
#define ZPCI_IOTA_RFTO_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_RF)
|
||||
#define ZPCI_IOTA_RFAA_FLAG (ZPCI_IOTA_IOT_ENABLED | ZPCI_KEY | ZPCI_IOTA_DT_PF | ZPCI_IOTA_FS_2G)
|
||||
|
||||
/* I/O Region and segment tables */
|
||||
#define ZPCI_INDEX_MASK 0x7ffUL
|
||||
|
||||
#define ZPCI_TABLE_TYPE_MASK 0xc
|
||||
#define ZPCI_TABLE_TYPE_RFX 0xc
|
||||
#define ZPCI_TABLE_TYPE_RSX 0x8
|
||||
#define ZPCI_TABLE_TYPE_RTX 0x4
|
||||
#define ZPCI_TABLE_TYPE_SX 0x0
|
||||
|
||||
#define ZPCI_TABLE_LEN_RFX 0x3
|
||||
#define ZPCI_TABLE_LEN_RSX 0x3
|
||||
#define ZPCI_TABLE_LEN_RTX 0x3
|
||||
|
||||
#define ZPCI_TABLE_OFFSET_MASK 0xc0
|
||||
#define ZPCI_TABLE_SIZE 0x4000
|
||||
#define ZPCI_TABLE_ALIGN ZPCI_TABLE_SIZE
|
||||
#define ZPCI_TABLE_ENTRY_SIZE (sizeof(unsigned long))
|
||||
#define ZPCI_TABLE_ENTRIES (ZPCI_TABLE_SIZE / ZPCI_TABLE_ENTRY_SIZE)
|
||||
|
||||
#define ZPCI_TABLE_BITS 11
|
||||
#define ZPCI_PT_BITS 8
|
||||
#define ZPCI_ST_SHIFT (ZPCI_PT_BITS + PAGE_SHIFT)
|
||||
#define ZPCI_RT_SHIFT (ZPCI_ST_SHIFT + ZPCI_TABLE_BITS)
|
||||
|
||||
#define ZPCI_RTE_FLAG_MASK 0x3fffUL
|
||||
#define ZPCI_RTE_ADDR_MASK (~ZPCI_RTE_FLAG_MASK)
|
||||
#define ZPCI_STE_FLAG_MASK 0x7ffUL
|
||||
#define ZPCI_STE_ADDR_MASK (~ZPCI_STE_FLAG_MASK)
|
||||
|
||||
/* I/O Page tables */
|
||||
#define ZPCI_PTE_VALID_MASK 0x400
|
||||
#define ZPCI_PTE_INVALID 0x400
|
||||
#define ZPCI_PTE_VALID 0x000
|
||||
#define ZPCI_PT_SIZE 0x800
|
||||
#define ZPCI_PT_ALIGN ZPCI_PT_SIZE
|
||||
#define ZPCI_PT_ENTRIES (ZPCI_PT_SIZE / ZPCI_TABLE_ENTRY_SIZE)
|
||||
#define ZPCI_PT_MASK (ZPCI_PT_ENTRIES - 1)
|
||||
|
||||
#define ZPCI_PTE_FLAG_MASK 0xfffUL
|
||||
#define ZPCI_PTE_ADDR_MASK (~ZPCI_PTE_FLAG_MASK)
|
||||
|
||||
/* Shared bits */
|
||||
#define ZPCI_TABLE_VALID 0x00
|
||||
#define ZPCI_TABLE_INVALID 0x20
|
||||
#define ZPCI_TABLE_PROTECTED 0x200
|
||||
#define ZPCI_TABLE_UNPROTECTED 0x000
|
||||
|
||||
#define ZPCI_TABLE_VALID_MASK 0x20
|
||||
#define ZPCI_TABLE_PROT_MASK 0x200
|
||||
|
||||
static inline unsigned int calc_rtx(dma_addr_t ptr)
|
||||
{
|
||||
return ((unsigned long) ptr >> ZPCI_RT_SHIFT) & ZPCI_INDEX_MASK;
|
||||
}
|
||||
|
||||
static inline unsigned int calc_sx(dma_addr_t ptr)
|
||||
{
|
||||
return ((unsigned long) ptr >> ZPCI_ST_SHIFT) & ZPCI_INDEX_MASK;
|
||||
}
|
||||
|
||||
static inline unsigned int calc_px(dma_addr_t ptr)
|
||||
{
|
||||
return ((unsigned long) ptr >> PAGE_SHIFT) & ZPCI_PT_MASK;
|
||||
}
|
||||
|
||||
static inline void set_pt_pfaa(unsigned long *entry, void *pfaa)
|
||||
{
|
||||
*entry &= ZPCI_PTE_FLAG_MASK;
|
||||
*entry |= ((unsigned long) pfaa & ZPCI_PTE_ADDR_MASK);
|
||||
}
|
||||
|
||||
static inline void set_rt_sto(unsigned long *entry, void *sto)
|
||||
{
|
||||
*entry &= ZPCI_RTE_FLAG_MASK;
|
||||
*entry |= ((unsigned long) sto & ZPCI_RTE_ADDR_MASK);
|
||||
*entry |= ZPCI_TABLE_TYPE_RTX;
|
||||
}
|
||||
|
||||
static inline void set_st_pto(unsigned long *entry, void *pto)
|
||||
{
|
||||
*entry &= ZPCI_STE_FLAG_MASK;
|
||||
*entry |= ((unsigned long) pto & ZPCI_STE_ADDR_MASK);
|
||||
*entry |= ZPCI_TABLE_TYPE_SX;
|
||||
}
|
||||
|
||||
static inline void validate_rt_entry(unsigned long *entry)
|
||||
{
|
||||
*entry &= ~ZPCI_TABLE_VALID_MASK;
|
||||
*entry &= ~ZPCI_TABLE_OFFSET_MASK;
|
||||
*entry |= ZPCI_TABLE_VALID;
|
||||
*entry |= ZPCI_TABLE_LEN_RTX;
|
||||
}
|
||||
|
||||
static inline void validate_st_entry(unsigned long *entry)
|
||||
{
|
||||
*entry &= ~ZPCI_TABLE_VALID_MASK;
|
||||
*entry |= ZPCI_TABLE_VALID;
|
||||
}
|
||||
|
||||
static inline void invalidate_table_entry(unsigned long *entry)
|
||||
{
|
||||
*entry &= ~ZPCI_TABLE_VALID_MASK;
|
||||
*entry |= ZPCI_TABLE_INVALID;
|
||||
}
|
||||
|
||||
static inline void invalidate_pt_entry(unsigned long *entry)
|
||||
{
|
||||
WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_INVALID);
|
||||
*entry &= ~ZPCI_PTE_VALID_MASK;
|
||||
*entry |= ZPCI_PTE_INVALID;
|
||||
}
|
||||
|
||||
static inline void validate_pt_entry(unsigned long *entry)
|
||||
{
|
||||
WARN_ON_ONCE((*entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID);
|
||||
*entry &= ~ZPCI_PTE_VALID_MASK;
|
||||
*entry |= ZPCI_PTE_VALID;
|
||||
}
|
||||
|
||||
static inline void entry_set_protected(unsigned long *entry)
|
||||
{
|
||||
*entry &= ~ZPCI_TABLE_PROT_MASK;
|
||||
*entry |= ZPCI_TABLE_PROTECTED;
|
||||
}
|
||||
|
||||
static inline void entry_clr_protected(unsigned long *entry)
|
||||
{
|
||||
*entry &= ~ZPCI_TABLE_PROT_MASK;
|
||||
*entry |= ZPCI_TABLE_UNPROTECTED;
|
||||
}
|
||||
|
||||
static inline int reg_entry_isvalid(unsigned long entry)
|
||||
{
|
||||
return (entry & ZPCI_TABLE_VALID_MASK) == ZPCI_TABLE_VALID;
|
||||
}
|
||||
|
||||
static inline int pt_entry_isvalid(unsigned long entry)
|
||||
{
|
||||
return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
|
||||
}
|
||||
|
||||
static inline int entry_isprotected(unsigned long entry)
|
||||
{
|
||||
return (entry & ZPCI_TABLE_PROT_MASK) == ZPCI_TABLE_PROTECTED;
|
||||
}
|
||||
|
||||
static inline unsigned long *get_rt_sto(unsigned long entry)
|
||||
{
|
||||
return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
|
||||
? (unsigned long *) (entry & ZPCI_RTE_ADDR_MASK)
|
||||
: NULL;
|
||||
}
|
||||
|
||||
static inline unsigned long *get_st_pto(unsigned long entry)
|
||||
{
|
||||
return ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_SX)
|
||||
? (unsigned long *) (entry & ZPCI_STE_ADDR_MASK)
|
||||
: NULL;
|
||||
}
|
||||
|
||||
/* Prototypes */
|
||||
int zpci_dma_init_device(struct zpci_dev *);
|
||||
void zpci_dma_exit_device(struct zpci_dev *);
|
||||
|
||||
#endif
|
||||
@ -2,4 +2,4 @@
|
||||
# Makefile for the s390 PCI subsystem.
|
||||
#
|
||||
|
||||
obj-$(CONFIG_PCI) += pci.o pci_clp.o pci_msi.o
|
||||
obj-$(CONFIG_PCI) += pci.o pci_dma.o pci_clp.o pci_msi.o
|
||||
|
||||
@ -34,6 +34,7 @@
|
||||
#include <asm/facility.h>
|
||||
#include <asm/pci_insn.h>
|
||||
#include <asm/pci_clp.h>
|
||||
#include <asm/pci_dma.h>
|
||||
|
||||
#define DEBUG /* enable pr_debug */
|
||||
|
||||
@ -232,6 +233,25 @@ static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* Modify PCI: Register I/O address translation parameters */
|
||||
int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
|
||||
u64 base, u64 limit, u64 iota)
|
||||
{
|
||||
struct mod_pci_args args = { base, limit, iota };
|
||||
|
||||
WARN_ON_ONCE(iota & 0x3fff);
|
||||
args.iota |= ZPCI_IOTA_RTTO_FLAG;
|
||||
return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
|
||||
}
|
||||
|
||||
/* Modify PCI: Unregister I/O address translation parameters */
|
||||
int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
|
||||
{
|
||||
struct mod_pci_args args = { 0, 0, 0 };
|
||||
|
||||
return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
|
||||
}
|
||||
|
||||
/* Modify PCI: Unregister adapter interruptions */
|
||||
static int zpci_unregister_airq(struct zpci_dev *zdev)
|
||||
{
|
||||
@ -602,6 +622,7 @@ static void zpci_remove_device(struct pci_dev *pdev)
|
||||
|
||||
dev_info(&pdev->dev, "Removing device %u\n", zdev->domain);
|
||||
zdev->state = ZPCI_FN_STATE_CONFIGURED;
|
||||
zpci_dma_exit_device(zdev);
|
||||
zpci_unmap_resources(pdev);
|
||||
list_del(&zdev->entry); /* can be called from init */
|
||||
zdev->pdev = NULL;
|
||||
@ -887,7 +908,14 @@ int zpci_enable_device(struct zpci_dev *zdev)
|
||||
if (rc)
|
||||
goto out;
|
||||
pr_info("Enabled fh: 0x%x fid: 0x%x\n", zdev->fh, zdev->fid);
|
||||
|
||||
rc = zpci_dma_init_device(zdev);
|
||||
if (rc)
|
||||
goto out_dma;
|
||||
return 0;
|
||||
|
||||
out_dma:
|
||||
clp_disable_fh(zdev);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
@ -929,6 +957,7 @@ out:
|
||||
|
||||
void zpci_stop_device(struct zpci_dev *zdev)
|
||||
{
|
||||
zpci_dma_exit_device(zdev);
|
||||
/*
|
||||
* Note: SCLP disables fh via set-pci-fn so don't
|
||||
* do that here.
|
||||
@ -953,6 +982,7 @@ int zpci_scan_device(struct zpci_dev *zdev)
|
||||
return 0;
|
||||
|
||||
out:
|
||||
zpci_dma_exit_device(zdev);
|
||||
clp_disable_fh(zdev);
|
||||
return -EIO;
|
||||
}
|
||||
@ -1028,6 +1058,10 @@ static int __init pci_base_init(void)
|
||||
if (rc)
|
||||
goto out_irq;
|
||||
|
||||
rc = zpci_dma_init();
|
||||
if (rc)
|
||||
goto out_dma;
|
||||
|
||||
rc = clp_find_pci_devices();
|
||||
if (rc)
|
||||
goto out_find;
|
||||
@ -1036,6 +1070,8 @@ static int __init pci_base_init(void)
|
||||
return 0;
|
||||
|
||||
out_find:
|
||||
zpci_dma_exit();
|
||||
out_dma:
|
||||
zpci_irq_exit();
|
||||
out_irq:
|
||||
zpci_msihash_exit();
|
||||
|
||||
@ -48,6 +48,8 @@ static void clp_free_block(void *ptr)
|
||||
static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
|
||||
struct clp_rsp_query_pci_grp *response)
|
||||
{
|
||||
zdev->tlb_refresh = response->refresh;
|
||||
zdev->dma_mask = response->dasm;
|
||||
zdev->msi_addr = response->msia;
|
||||
|
||||
pr_debug("Supported number of MSI vectors: %u\n", response->noi);
|
||||
@ -97,6 +99,8 @@ static int clp_store_query_pci_fn(struct zpci_dev *zdev,
|
||||
zdev->bars[i].val = le32_to_cpu(response->bar[i]);
|
||||
zdev->bars[i].size = response->bar_size[i];
|
||||
}
|
||||
zdev->start_dma = response->sdma;
|
||||
zdev->end_dma = response->edma;
|
||||
zdev->pchid = response->pchid;
|
||||
zdev->pfgid = response->pfgid;
|
||||
return 0;
|
||||
|
||||
505
arch/s390/pci/pci_dma.c
Normal file
505
arch/s390/pci/pci_dma.c
Normal file
@ -0,0 +1,505 @@
|
||||
/*
|
||||
* Copyright IBM Corp. 2012
|
||||
*
|
||||
* Author(s):
|
||||
* Jan Glauber <jang@linux.vnet.ibm.com>
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/iommu-helper.h>
|
||||
#include <linux/dma-mapping.h>
|
||||
#include <linux/pci.h>
|
||||
#include <asm/pci_dma.h>
|
||||
|
||||
static enum zpci_ioat_dtype zpci_ioat_dt = ZPCI_IOTA_RTTO;
|
||||
|
||||
static struct kmem_cache *dma_region_table_cache;
|
||||
static struct kmem_cache *dma_page_table_cache;
|
||||
|
||||
static unsigned long *dma_alloc_cpu_table(void)
|
||||
{
|
||||
unsigned long *table, *entry;
|
||||
|
||||
table = kmem_cache_alloc(dma_region_table_cache, GFP_ATOMIC);
|
||||
if (!table)
|
||||
return NULL;
|
||||
|
||||
for (entry = table; entry < table + ZPCI_TABLE_ENTRIES; entry++)
|
||||
*entry = ZPCI_TABLE_INVALID | ZPCI_TABLE_PROTECTED;
|
||||
return table;
|
||||
}
|
||||
|
||||
static void dma_free_cpu_table(void *table)
|
||||
{
|
||||
kmem_cache_free(dma_region_table_cache, table);
|
||||
}
|
||||
|
||||
static unsigned long *dma_alloc_page_table(void)
|
||||
{
|
||||
unsigned long *table, *entry;
|
||||
|
||||
table = kmem_cache_alloc(dma_page_table_cache, GFP_ATOMIC);
|
||||
if (!table)
|
||||
return NULL;
|
||||
|
||||
for (entry = table; entry < table + ZPCI_PT_ENTRIES; entry++)
|
||||
*entry = ZPCI_PTE_INVALID | ZPCI_TABLE_PROTECTED;
|
||||
return table;
|
||||
}
|
||||
|
||||
static void dma_free_page_table(void *table)
|
||||
{
|
||||
kmem_cache_free(dma_page_table_cache, table);
|
||||
}
|
||||
|
||||
static unsigned long *dma_get_seg_table_origin(unsigned long *entry)
|
||||
{
|
||||
unsigned long *sto;
|
||||
|
||||
if (reg_entry_isvalid(*entry))
|
||||
sto = get_rt_sto(*entry);
|
||||
else {
|
||||
sto = dma_alloc_cpu_table();
|
||||
if (!sto)
|
||||
return NULL;
|
||||
|
||||
set_rt_sto(entry, sto);
|
||||
validate_rt_entry(entry);
|
||||
entry_clr_protected(entry);
|
||||
}
|
||||
return sto;
|
||||
}
|
||||
|
||||
static unsigned long *dma_get_page_table_origin(unsigned long *entry)
|
||||
{
|
||||
unsigned long *pto;
|
||||
|
||||
if (reg_entry_isvalid(*entry))
|
||||
pto = get_st_pto(*entry);
|
||||
else {
|
||||
pto = dma_alloc_page_table();
|
||||
if (!pto)
|
||||
return NULL;
|
||||
set_st_pto(entry, pto);
|
||||
validate_st_entry(entry);
|
||||
entry_clr_protected(entry);
|
||||
}
|
||||
return pto;
|
||||
}
|
||||
|
||||
static unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
|
||||
{
|
||||
unsigned long *sto, *pto;
|
||||
unsigned int rtx, sx, px;
|
||||
|
||||
rtx = calc_rtx(dma_addr);
|
||||
sto = dma_get_seg_table_origin(&rto[rtx]);
|
||||
if (!sto)
|
||||
return NULL;
|
||||
|
||||
sx = calc_sx(dma_addr);
|
||||
pto = dma_get_page_table_origin(&sto[sx]);
|
||||
if (!pto)
|
||||
return NULL;
|
||||
|
||||
px = calc_px(dma_addr);
|
||||
return &pto[px];
|
||||
}
|
||||
|
||||
static void dma_update_cpu_trans(struct zpci_dev *zdev, void *page_addr,
|
||||
dma_addr_t dma_addr, int flags)
|
||||
{
|
||||
unsigned long *entry;
|
||||
|
||||
entry = dma_walk_cpu_trans(zdev->dma_table, dma_addr);
|
||||
if (!entry) {
|
||||
WARN_ON_ONCE(1);
|
||||
return;
|
||||
}
|
||||
|
||||
if (flags & ZPCI_PTE_INVALID) {
|
||||
invalidate_pt_entry(entry);
|
||||
return;
|
||||
} else {
|
||||
set_pt_pfaa(entry, page_addr);
|
||||
validate_pt_entry(entry);
|
||||
}
|
||||
|
||||
if (flags & ZPCI_TABLE_PROTECTED)
|
||||
entry_set_protected(entry);
|
||||
else
|
||||
entry_clr_protected(entry);
|
||||
}
|
||||
|
||||
static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
|
||||
dma_addr_t dma_addr, size_t size, int flags)
|
||||
{
|
||||
unsigned int nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
||||
u8 *page_addr = (u8 *) (pa & PAGE_MASK);
|
||||
dma_addr_t start_dma_addr = dma_addr;
|
||||
unsigned long irq_flags;
|
||||
int i, rc = 0;
|
||||
|
||||
if (!nr_pages)
|
||||
return -EINVAL;
|
||||
|
||||
spin_lock_irqsave(&zdev->dma_table_lock, irq_flags);
|
||||
if (!zdev->dma_table) {
|
||||
dev_err(&zdev->pdev->dev, "Missing DMA table\n");
|
||||
goto no_refresh;
|
||||
}
|
||||
|
||||
for (i = 0; i < nr_pages; i++) {
|
||||
dma_update_cpu_trans(zdev, page_addr, dma_addr, flags);
|
||||
page_addr += PAGE_SIZE;
|
||||
dma_addr += PAGE_SIZE;
|
||||
}
|
||||
|
||||
/*
|
||||
* rpcit is not required to establish new translations when previously
|
||||
* invalid translation-table entries are validated, however it is
|
||||
* required when altering previously valid entries.
|
||||
*/
|
||||
if (!zdev->tlb_refresh &&
|
||||
((flags & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID))
|
||||
/*
|
||||
* TODO: also need to check that the old entry is indeed INVALID
|
||||
* and not only for one page but for the whole range...
|
||||
* -> now we WARN_ON in that case but with lazy unmap that
|
||||
* needs to be redone!
|
||||
*/
|
||||
goto no_refresh;
|
||||
rc = rpcit_instr((u64) zdev->fh << 32, start_dma_addr,
|
||||
nr_pages * PAGE_SIZE);
|
||||
|
||||
no_refresh:
|
||||
spin_unlock_irqrestore(&zdev->dma_table_lock, irq_flags);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void dma_free_seg_table(unsigned long entry)
|
||||
{
|
||||
unsigned long *sto = get_rt_sto(entry);
|
||||
int sx;
|
||||
|
||||
for (sx = 0; sx < ZPCI_TABLE_ENTRIES; sx++)
|
||||
if (reg_entry_isvalid(sto[sx]))
|
||||
dma_free_page_table(get_st_pto(sto[sx]));
|
||||
|
||||
dma_free_cpu_table(sto);
|
||||
}
|
||||
|
||||
static void dma_cleanup_tables(struct zpci_dev *zdev)
|
||||
{
|
||||
unsigned long *table = zdev->dma_table;
|
||||
int rtx;
|
||||
|
||||
if (!zdev || !zdev->dma_table)
|
||||
return;
|
||||
|
||||
for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
|
||||
if (reg_entry_isvalid(table[rtx]))
|
||||
dma_free_seg_table(table[rtx]);
|
||||
|
||||
dma_free_cpu_table(table);
|
||||
zdev->dma_table = NULL;
|
||||
}
|
||||
|
||||
static unsigned long __dma_alloc_iommu(struct zpci_dev *zdev, unsigned long start,
|
||||
int size)
|
||||
{
|
||||
unsigned long boundary_size = 0x1000000;
|
||||
|
||||
return iommu_area_alloc(zdev->iommu_bitmap, zdev->iommu_pages,
|
||||
start, size, 0, boundary_size, 0);
|
||||
}
|
||||
|
||||
static unsigned long dma_alloc_iommu(struct zpci_dev *zdev, int size)
|
||||
{
|
||||
unsigned long offset, flags;
|
||||
|
||||
spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
|
||||
offset = __dma_alloc_iommu(zdev, zdev->next_bit, size);
|
||||
if (offset == -1)
|
||||
offset = __dma_alloc_iommu(zdev, 0, size);
|
||||
|
||||
if (offset != -1) {
|
||||
zdev->next_bit = offset + size;
|
||||
if (zdev->next_bit >= zdev->iommu_pages)
|
||||
zdev->next_bit = 0;
|
||||
}
|
||||
spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
|
||||
return offset;
|
||||
}
|
||||
|
||||
static void dma_free_iommu(struct zpci_dev *zdev, unsigned long offset, int size)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
spin_lock_irqsave(&zdev->iommu_bitmap_lock, flags);
|
||||
if (!zdev->iommu_bitmap)
|
||||
goto out;
|
||||
bitmap_clear(zdev->iommu_bitmap, offset, size);
|
||||
if (offset >= zdev->next_bit)
|
||||
zdev->next_bit = offset + size;
|
||||
out:
|
||||
spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
|
||||
}
|
||||
|
||||
int dma_set_mask(struct device *dev, u64 mask)
|
||||
{
|
||||
if (!dev->dma_mask || !dma_supported(dev, mask))
|
||||
return -EIO;
|
||||
|
||||
*dev->dma_mask = mask;
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dma_set_mask);
|
||||
|
||||
static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
|
||||
unsigned long offset, size_t size,
|
||||
enum dma_data_direction direction,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
struct zpci_dev *zdev = get_zdev(container_of(dev, struct pci_dev, dev));
|
||||
unsigned long nr_pages, iommu_page_index;
|
||||
unsigned long pa = page_to_phys(page) + offset;
|
||||
int flags = ZPCI_PTE_VALID;
|
||||
dma_addr_t dma_addr;
|
||||
|
||||
WARN_ON_ONCE(offset > PAGE_SIZE);
|
||||
|
||||
/* This rounds up number of pages based on size and offset */
|
||||
nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
|
||||
iommu_page_index = dma_alloc_iommu(zdev, nr_pages);
|
||||
if (iommu_page_index == -1)
|
||||
goto out_err;
|
||||
|
||||
/* Use rounded up size */
|
||||
size = nr_pages * PAGE_SIZE;
|
||||
|
||||
dma_addr = zdev->start_dma + iommu_page_index * PAGE_SIZE;
|
||||
if (dma_addr + size > zdev->end_dma) {
|
||||
dev_err(dev, "(dma_addr: 0x%16.16LX + size: 0x%16.16lx) > end_dma: 0x%16.16Lx\n",
|
||||
dma_addr, size, zdev->end_dma);
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
|
||||
flags |= ZPCI_TABLE_PROTECTED;
|
||||
|
||||
if (!dma_update_trans(zdev, pa, dma_addr, size, flags))
|
||||
return dma_addr + offset;
|
||||
|
||||
out_free:
|
||||
dma_free_iommu(zdev, iommu_page_index, nr_pages);
|
||||
out_err:
|
||||
dev_err(dev, "Failed to map addr: %lx\n", pa);
|
||||
return DMA_ERROR_CODE;
|
||||
}
|
||||
|
||||
static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
|
||||
size_t size, enum dma_data_direction direction,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
struct zpci_dev *zdev = get_zdev(container_of(dev, struct pci_dev, dev));
|
||||
unsigned long iommu_page_index;
|
||||
int npages;
|
||||
|
||||
npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
|
||||
dma_addr = dma_addr & PAGE_MASK;
|
||||
if (dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
|
||||
ZPCI_TABLE_PROTECTED | ZPCI_PTE_INVALID))
|
||||
dev_err(dev, "Failed to unmap addr: %Lx\n", dma_addr);
|
||||
|
||||
iommu_page_index = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;
|
||||
dma_free_iommu(zdev, iommu_page_index, npages);
|
||||
}
|
||||
|
||||
static void *s390_dma_alloc(struct device *dev, size_t size,
|
||||
dma_addr_t *dma_handle, gfp_t flag,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
struct page *page;
|
||||
unsigned long pa;
|
||||
dma_addr_t map;
|
||||
|
||||
size = PAGE_ALIGN(size);
|
||||
page = alloc_pages(flag, get_order(size));
|
||||
if (!page)
|
||||
return NULL;
|
||||
pa = page_to_phys(page);
|
||||
memset((void *) pa, 0, size);
|
||||
|
||||
map = s390_dma_map_pages(dev, page, pa % PAGE_SIZE,
|
||||
size, DMA_BIDIRECTIONAL, NULL);
|
||||
if (dma_mapping_error(dev, map)) {
|
||||
free_pages(pa, get_order(size));
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (dma_handle)
|
||||
*dma_handle = map;
|
||||
return (void *) pa;
|
||||
}
|
||||
|
||||
static void s390_dma_free(struct device *dev, size_t size,
|
||||
void *pa, dma_addr_t dma_handle,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
s390_dma_unmap_pages(dev, dma_handle, PAGE_ALIGN(size),
|
||||
DMA_BIDIRECTIONAL, NULL);
|
||||
free_pages((unsigned long) pa, get_order(size));
|
||||
}
|
||||
|
||||
static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
||||
int nr_elements, enum dma_data_direction dir,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
int mapped_elements = 0;
|
||||
struct scatterlist *s;
|
||||
int i;
|
||||
|
||||
for_each_sg(sg, s, nr_elements, i) {
|
||||
struct page *page = sg_page(s);
|
||||
s->dma_address = s390_dma_map_pages(dev, page, s->offset,
|
||||
s->length, dir, NULL);
|
||||
if (!dma_mapping_error(dev, s->dma_address)) {
|
||||
s->dma_length = s->length;
|
||||
mapped_elements++;
|
||||
} else
|
||||
goto unmap;
|
||||
}
|
||||
out:
|
||||
return mapped_elements;
|
||||
|
||||
unmap:
|
||||
for_each_sg(sg, s, mapped_elements, i) {
|
||||
if (s->dma_address)
|
||||
s390_dma_unmap_pages(dev, s->dma_address, s->dma_length,
|
||||
dir, NULL);
|
||||
s->dma_address = 0;
|
||||
s->dma_length = 0;
|
||||
}
|
||||
mapped_elements = 0;
|
||||
goto out;
|
||||
}
|
||||
|
||||
static void s390_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
|
||||
int nr_elements, enum dma_data_direction dir,
|
||||
struct dma_attrs *attrs)
|
||||
{
|
||||
struct scatterlist *s;
|
||||
int i;
|
||||
|
||||
for_each_sg(sg, s, nr_elements, i) {
|
||||
s390_dma_unmap_pages(dev, s->dma_address, s->dma_length, dir, NULL);
|
||||
s->dma_address = 0;
|
||||
s->dma_length = 0;
|
||||
}
|
||||
}
|
||||
|
||||
int zpci_dma_init_device(struct zpci_dev *zdev)
|
||||
{
|
||||
unsigned int bitmap_order;
|
||||
int rc;
|
||||
|
||||
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_clean;
|
||||
}
|
||||
|
||||
zdev->iommu_size = (unsigned long) high_memory - PAGE_OFFSET;
|
||||
zdev->iommu_pages = zdev->iommu_size >> PAGE_SHIFT;
|
||||
bitmap_order = get_order(zdev->iommu_pages / 8);
|
||||
pr_info("iommu_size: 0x%lx iommu_pages: 0x%lx bitmap_order: %i\n",
|
||||
zdev->iommu_size, zdev->iommu_pages, bitmap_order);
|
||||
|
||||
zdev->iommu_bitmap = (void *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
|
||||
bitmap_order);
|
||||
if (!zdev->iommu_bitmap) {
|
||||
rc = -ENOMEM;
|
||||
goto out_reg;
|
||||
}
|
||||
|
||||
rc = zpci_register_ioat(zdev,
|
||||
0,
|
||||
zdev->start_dma + PAGE_OFFSET,
|
||||
zdev->start_dma + zdev->iommu_size - 1,
|
||||
(u64) zdev->dma_table);
|
||||
if (rc)
|
||||
goto out_reg;
|
||||
return 0;
|
||||
|
||||
out_reg:
|
||||
dma_free_cpu_table(zdev->dma_table);
|
||||
out_clean:
|
||||
return rc;
|
||||
}
|
||||
|
||||
void zpci_dma_exit_device(struct zpci_dev *zdev)
|
||||
{
|
||||
zpci_unregister_ioat(zdev, 0);
|
||||
dma_cleanup_tables(zdev);
|
||||
free_pages((unsigned long) zdev->iommu_bitmap,
|
||||
get_order(zdev->iommu_pages / 8));
|
||||
zdev->iommu_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);
|
||||
}
|
||||
|
||||
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
|
||||
|
||||
static int __init dma_debug_do_init(void)
|
||||
{
|
||||
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
|
||||
return 0;
|
||||
}
|
||||
fs_initcall(dma_debug_do_init);
|
||||
|
||||
struct dma_map_ops s390_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,
|
||||
/* if we support direct DMA this must be conditional */
|
||||
.is_phys = 0,
|
||||
/* dma_supported is unconditionally true without a callback */
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(s390_dma_ops);
|
||||
Loading…
Reference in New Issue
Block a user