Commit 9bca7c40 authored by Linus Torvalds's avatar Linus Torvalds

Merge tag 's390-5.7-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - Add missing R_390_JMP_SLOT relocation type in KASLR code.

 - Fix set_huge_pte_at for empty ptes issue which has been uncovered
   with arch page table helper tests.

 - Correct initrd location for kdump kernel.

 - Fix s390_mmio_read/write with MIO in PCI code.

* tag 's390-5.7-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/kaslr: add support for R_390_JMP_SLOT relocation type
  s390/mm: fix set_huge_pte_at() for empty ptes
  s390/kexec_file: fix initrd location for kdump kernel
  s390/pci: Fix s390_mmio_read/write with MIO
parents e644645a 4c1cbcbd
......@@ -8,6 +8,10 @@
#include <linux/slab.h>
#include <asm/pci_insn.h>
/* I/O size constraints */
#define ZPCI_MAX_READ_SIZE 8
#define ZPCI_MAX_WRITE_SIZE 128
/* I/O Map */
#define ZPCI_IOMAP_SHIFT 48
#define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000UL
......@@ -140,7 +144,8 @@ static inline int zpci_memcpy_fromio(void *dst,
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) src,
(u64) dst, n, 8);
(u64) dst, n,
ZPCI_MAX_READ_SIZE);
rc = zpci_read_single(dst, src, size);
if (rc)
break;
......@@ -161,7 +166,8 @@ static inline int zpci_memcpy_toio(volatile void __iomem *dst,
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) dst,
(u64) src, n, 128);
(u64) src, n,
ZPCI_MAX_WRITE_SIZE);
if (size > 8) /* main path */
rc = zpci_write_block(dst, src, size);
else
......
......@@ -151,7 +151,7 @@ static int kexec_file_add_initrd(struct kimage *image,
buf.mem += crashk_res.start;
buf.memsz = buf.bufsz;
data->parm->initrd_start = buf.mem;
data->parm->initrd_start = data->memsz;
data->parm->initrd_size = buf.memsz;
data->memsz += buf.memsz;
......
......@@ -28,6 +28,7 @@ int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
break;
case R_390_64: /* Direct 64 bit. */
case R_390_GLOB_DAT:
case R_390_JMP_SLOT:
*(u64 *)loc = val;
break;
case R_390_PC16: /* PC relative 16 bit. */
......
......@@ -159,10 +159,13 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
rste &= ~_SEGMENT_ENTRY_NOEXEC;
/* Set correct table type for 2G hugepages */
if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
rste |= _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE;
else
if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
if (likely(pte_present(pte)))
rste |= _REGION3_ENTRY_LARGE;
rste |= _REGION_ENTRY_TYPE_R3;
} else if (likely(pte_present(pte)))
rste |= _SEGMENT_ENTRY_LARGE;
clear_huge_pte_skeys(mm, rste);
pte_val(*ptep) = rste;
}
......
......@@ -11,6 +11,113 @@
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <asm/pci_io.h>
#include <asm/pci_debug.h>
static inline void zpci_err_mmio(u8 cc, u8 status, u64 offset)
{
struct {
u64 offset;
u8 cc;
u8 status;
} data = {offset, cc, status};
zpci_err_hex(&data, sizeof(data));
}
static inline int __pcistb_mio_inuser(
void __iomem *ioaddr, const void __user *src,
u64 len, u8 *status)
{
int cc = -ENXIO;
asm volatile (
" sacf 256\n"
"0: .insn rsy,0xeb00000000d4,%[len],%[ioaddr],%[src]\n"
"1: ipm %[cc]\n"
" srl %[cc],28\n"
"2: sacf 768\n"
EX_TABLE(0b, 2b) EX_TABLE(1b, 2b)
: [cc] "+d" (cc), [len] "+d" (len)
: [ioaddr] "a" (ioaddr), [src] "Q" (*((u8 __force *)src))
: "cc", "memory");
*status = len >> 24 & 0xff;
return cc;
}
static inline int __pcistg_mio_inuser(
void __iomem *ioaddr, const void __user *src,
u64 ulen, u8 *status)
{
register u64 addr asm("2") = (u64 __force) ioaddr;
register u64 len asm("3") = ulen;
int cc = -ENXIO;
u64 val = 0;
u64 cnt = ulen;
u8 tmp;
/*
* copy 0 < @len <= 8 bytes from @src into the right most bytes of
* a register, then store it to PCI at @ioaddr while in secondary
* address space. pcistg then uses the user mappings.
*/
asm volatile (
" sacf 256\n"
"0: llgc %[tmp],0(%[src])\n"
" sllg %[val],%[val],8\n"
" aghi %[src],1\n"
" ogr %[val],%[tmp]\n"
" brctg %[cnt],0b\n"
"1: .insn rre,0xb9d40000,%[val],%[ioaddr]\n"
"2: ipm %[cc]\n"
" srl %[cc],28\n"
"3: sacf 768\n"
EX_TABLE(0b, 3b) EX_TABLE(1b, 3b) EX_TABLE(2b, 3b)
:
[src] "+a" (src), [cnt] "+d" (cnt),
[val] "+d" (val), [tmp] "=d" (tmp),
[len] "+d" (len), [cc] "+d" (cc),
[ioaddr] "+a" (addr)
:: "cc", "memory");
*status = len >> 24 & 0xff;
/* did we read everything from user memory? */
if (!cc && cnt != 0)
cc = -EFAULT;
return cc;
}
static inline int __memcpy_toio_inuser(void __iomem *dst,
const void __user *src, size_t n)
{
int size, rc = 0;
u8 status = 0;
mm_segment_t old_fs;
if (!src)
return -EINVAL;
old_fs = enable_sacf_uaccess();
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) dst,
(u64 __force) src, n,
ZPCI_MAX_WRITE_SIZE);
if (size > 8) /* main path */
rc = __pcistb_mio_inuser(dst, src, size, &status);
else
rc = __pcistg_mio_inuser(dst, src, size, &status);
if (rc)
break;
src += size;
dst += size;
n -= size;
}
disable_sacf_uaccess(old_fs);
if (rc)
zpci_err_mmio(rc, status, (__force u64) dst);
return rc;
}
static long get_pfn(unsigned long user_addr, unsigned long access,
unsigned long *pfn)
......@@ -46,6 +153,20 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr,
if (length <= 0 || PAGE_SIZE - (mmio_addr & ~PAGE_MASK) < length)
return -EINVAL;
/*
* Only support read access to MIO capable devices on a MIO enabled
* system. Otherwise we would have to check for every address if it is
* a special ZPCI_ADDR and we would have to do a get_pfn() which we
* don't need for MIO capable devices.
*/
if (static_branch_likely(&have_mio)) {
ret = __memcpy_toio_inuser((void __iomem *) mmio_addr,
user_buffer,
length);
return ret;
}
if (length > 64) {
buf = kmalloc(length, GFP_KERNEL);
if (!buf)
......@@ -56,7 +177,8 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr,
ret = get_pfn(mmio_addr, VM_WRITE, &pfn);
if (ret)
goto out;
io_addr = (void __iomem *)((pfn << PAGE_SHIFT) | (mmio_addr & ~PAGE_MASK));
io_addr = (void __iomem *)((pfn << PAGE_SHIFT) |
(mmio_addr & ~PAGE_MASK));
ret = -EFAULT;
if ((unsigned long) io_addr < ZPCI_IOMAP_ADDR_BASE)
......@@ -72,6 +194,78 @@ SYSCALL_DEFINE3(s390_pci_mmio_write, unsigned long, mmio_addr,
return ret;
}
static inline int __pcilg_mio_inuser(
void __user *dst, const void __iomem *ioaddr,
u64 ulen, u8 *status)
{
register u64 addr asm("2") = (u64 __force) ioaddr;
register u64 len asm("3") = ulen;
u64 cnt = ulen;
int shift = ulen * 8;
int cc = -ENXIO;
u64 val, tmp;
/*
* read 0 < @len <= 8 bytes from the PCI memory mapped at @ioaddr (in
* user space) into a register using pcilg then store these bytes at
* user address @dst
*/
asm volatile (
" sacf 256\n"
"0: .insn rre,0xb9d60000,%[val],%[ioaddr]\n"
"1: ipm %[cc]\n"
" srl %[cc],28\n"
" ltr %[cc],%[cc]\n"
" jne 4f\n"
"2: ahi %[shift],-8\n"
" srlg %[tmp],%[val],0(%[shift])\n"
"3: stc %[tmp],0(%[dst])\n"
" aghi %[dst],1\n"
" brctg %[cnt],2b\n"
"4: sacf 768\n"
EX_TABLE(0b, 4b) EX_TABLE(1b, 4b) EX_TABLE(3b, 4b)
:
[cc] "+d" (cc), [val] "=d" (val), [len] "+d" (len),
[dst] "+a" (dst), [cnt] "+d" (cnt), [tmp] "=d" (tmp),
[shift] "+d" (shift)
:
[ioaddr] "a" (addr)
: "cc", "memory");
/* did we write everything to the user space buffer? */
if (!cc && cnt != 0)
cc = -EFAULT;
*status = len >> 24 & 0xff;
return cc;
}
static inline int __memcpy_fromio_inuser(void __user *dst,
const void __iomem *src,
unsigned long n)
{
int size, rc = 0;
u8 status;
mm_segment_t old_fs;
old_fs = enable_sacf_uaccess();
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) src,
(u64 __force) dst, n,
ZPCI_MAX_READ_SIZE);
rc = __pcilg_mio_inuser(dst, src, size, &status);
if (rc)
break;
src += size;
dst += size;
n -= size;
}
disable_sacf_uaccess(old_fs);
if (rc)
zpci_err_mmio(rc, status, (__force u64) dst);
return rc;
}
SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr,
void __user *, user_buffer, size_t, length)
{
......@@ -86,12 +280,27 @@ SYSCALL_DEFINE3(s390_pci_mmio_read, unsigned long, mmio_addr,
if (length <= 0 || PAGE_SIZE - (mmio_addr & ~PAGE_MASK) < length)
return -EINVAL;
/*
* Only support write access to MIO capable devices on a MIO enabled
* system. Otherwise we would have to check for every address if it is
* a special ZPCI_ADDR and we would have to do a get_pfn() which we
* don't need for MIO capable devices.
*/
if (static_branch_likely(&have_mio)) {
ret = __memcpy_fromio_inuser(
user_buffer, (const void __iomem *)mmio_addr,
length);
return ret;
}
if (length > 64) {
buf = kmalloc(length, GFP_KERNEL);
if (!buf)
return -ENOMEM;
} else
} else {
buf = local_buf;
}
ret = get_pfn(mmio_addr, VM_READ, &pfn);
if (ret)
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment