mirror of https://gitee.com/openkylin/linux.git
char/mspec: remove SGI SN2 support
The SGI SN2 support is about to be removed, so drop the bits specific to it from this driver. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lkml.kernel.org/r/20190813072514.23299-10-hch@lst.de Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Christoph Hellwig
Tony Luck
parent
9c860e4cf7
commit
0fef2532d2
|
|
@ -9,11 +9,8 @@
|
|||
*
|
||||
* This driver exports the SN special memory (mspec) facility to user
|
||||
* processes.
|
||||
* There are three types of memory made available thru this driver:
|
||||
* fetchops, uncached and cached.
|
||||
*
|
||||
* Fetchops are atomic memory operations that are implemented in the
|
||||
* memory controller on SGI SN hardware.
|
||||
* There are two types of memory made available thru this driver:
|
||||
* uncached and cached.
|
||||
*
|
||||
* Uncached are used for memory write combining feature of the ia64
|
||||
* cpu.
|
||||
|
|
@ -46,16 +43,8 @@
|
|||
#include <linux/atomic.h>
|
||||
#include <asm/tlbflush.h>
|
||||
#include <asm/uncached.h>
|
||||
#include <asm/sn/addrs.h>
|
||||
#include <asm/sn/arch.h>
|
||||
#include <asm/sn/mspec.h>
|
||||
#include <asm/sn/sn_cpuid.h>
|
||||
#include <asm/sn/io.h>
|
||||
#include <asm/sn/bte.h>
|
||||
#include <asm/sn/shubio.h>
|
||||
|
||||
|
||||
#define FETCHOP_ID "SGI Fetchop,"
|
||||
#define CACHED_ID "Cached,"
|
||||
#define UNCACHED_ID "Uncached"
|
||||
#define REVISION "4.0"
|
||||
|
|
@ -65,17 +54,10 @@
|
|||
* Page types allocated by the device.
|
||||
*/
|
||||
enum mspec_page_type {
|
||||
MSPEC_FETCHOP = 1,
|
||||
MSPEC_CACHED,
|
||||
MSPEC_CACHED = 2,
|
||||
MSPEC_UNCACHED
|
||||
};
|
||||
|
||||
#ifdef CONFIG_SGI_SN
|
||||
static int is_sn2;
|
||||
#else
|
||||
#define is_sn2 0
|
||||
#endif
|
||||
|
||||
/*
|
||||
* One of these structures is allocated when an mspec region is mmaped. The
|
||||
* structure is pointed to by the vma->vm_private_data field in the vma struct.
|
||||
|
|
@ -96,39 +78,6 @@ struct vma_data {
|
|||
unsigned long maddr[0]; /* Array of MSPEC addresses. */
|
||||
};
|
||||
|
||||
/* used on shub2 to clear FOP cache in the HUB */
|
||||
static unsigned long scratch_page[MAX_NUMNODES];
|
||||
#define SH2_AMO_CACHE_ENTRIES 4
|
||||
|
||||
static inline int
|
||||
mspec_zero_block(unsigned long addr, int len)
|
||||
{
|
||||
int status;
|
||||
|
||||
if (is_sn2) {
|
||||
if (is_shub2()) {
|
||||
int nid;
|
||||
void *p;
|
||||
int i;
|
||||
|
||||
nid = nasid_to_cnodeid(get_node_number(__pa(addr)));
|
||||
p = (void *)TO_AMO(scratch_page[nid]);
|
||||
|
||||
for (i=0; i < SH2_AMO_CACHE_ENTRIES; i++) {
|
||||
FETCHOP_LOAD_OP(p, FETCHOP_LOAD);
|
||||
p += FETCHOP_VAR_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
status = bte_copy(0, addr & ~__IA64_UNCACHED_OFFSET, len,
|
||||
BTE_WACQUIRE | BTE_ZERO_FILL, NULL);
|
||||
} else {
|
||||
memset((char *) addr, 0, len);
|
||||
status = 0;
|
||||
}
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* mspec_open
|
||||
*
|
||||
|
|
@ -173,11 +122,8 @@ mspec_close(struct vm_area_struct *vma)
|
|||
*/
|
||||
my_page = vdata->maddr[index];
|
||||
vdata->maddr[index] = 0;
|
||||
if (!mspec_zero_block(my_page, PAGE_SIZE))
|
||||
uncached_free_page(my_page, 1);
|
||||
else
|
||||
printk(KERN_WARNING "mspec_close(): "
|
||||
"failed to zero page %ld\n", my_page);
|
||||
memset((char *)my_page, 0, PAGE_SIZE);
|
||||
uncached_free_page(my_page, 1);
|
||||
}
|
||||
|
||||
kvfree(vdata);
|
||||
|
|
@ -213,11 +159,7 @@ mspec_fault(struct vm_fault *vmf)
|
|||
spin_unlock(&vdata->lock);
|
||||
}
|
||||
|
||||
if (vdata->type == MSPEC_FETCHOP)
|
||||
paddr = TO_AMO(maddr);
|
||||
else
|
||||
paddr = maddr & ~__IA64_UNCACHED_OFFSET;
|
||||
|
||||
paddr = maddr & ~__IA64_UNCACHED_OFFSET;
|
||||
pfn = paddr >> PAGE_SHIFT;
|
||||
|
||||
return vmf_insert_pfn(vmf->vma, vmf->address, pfn);
|
||||
|
|
@ -269,19 +211,13 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
|
|||
vma->vm_private_data = vdata;
|
||||
|
||||
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
||||
if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
|
||||
if (vdata->type == MSPEC_UNCACHED)
|
||||
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
||||
vma->vm_ops = &mspec_vm_ops;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
fetchop_mmap(struct file *file, struct vm_area_struct *vma)
|
||||
{
|
||||
return mspec_mmap(file, vma, MSPEC_FETCHOP);
|
||||
}
|
||||
|
||||
static int
|
||||
cached_mmap(struct file *file, struct vm_area_struct *vma)
|
||||
{
|
||||
|
|
@ -294,18 +230,6 @@ uncached_mmap(struct file *file, struct vm_area_struct *vma)
|
|||
return mspec_mmap(file, vma, MSPEC_UNCACHED);
|
||||
}
|
||||
|
||||
static const struct file_operations fetchop_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.mmap = fetchop_mmap,
|
||||
.llseek = noop_llseek,
|
||||
};
|
||||
|
||||
static struct miscdevice fetchop_miscdev = {
|
||||
.minor = MISC_DYNAMIC_MINOR,
|
||||
.name = "sgi_fetchop",
|
||||
.fops = &fetchop_fops
|
||||
};
|
||||
|
||||
static const struct file_operations cached_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.mmap = cached_mmap,
|
||||
|
|
@ -339,89 +263,32 @@ static int __init
|
|||
mspec_init(void)
|
||||
{
|
||||
int ret;
|
||||
int nid;
|
||||
|
||||
/*
|
||||
* The fetchop device only works on SN2 hardware, uncached and cached
|
||||
* memory drivers should both be valid on all ia64 hardware
|
||||
*/
|
||||
#ifdef CONFIG_SGI_SN
|
||||
if (ia64_platform_is("sn2")) {
|
||||
is_sn2 = 1;
|
||||
if (is_shub2()) {
|
||||
ret = -ENOMEM;
|
||||
for_each_node_state(nid, N_ONLINE) {
|
||||
int actual_nid;
|
||||
int nasid;
|
||||
unsigned long phys;
|
||||
|
||||
scratch_page[nid] = uncached_alloc_page(nid, 1);
|
||||
if (scratch_page[nid] == 0)
|
||||
goto free_scratch_pages;
|
||||
phys = __pa(scratch_page[nid]);
|
||||
nasid = get_node_number(phys);
|
||||
actual_nid = nasid_to_cnodeid(nasid);
|
||||
if (actual_nid != nid)
|
||||
goto free_scratch_pages;
|
||||
}
|
||||
}
|
||||
|
||||
ret = misc_register(&fetchop_miscdev);
|
||||
if (ret) {
|
||||
printk(KERN_ERR
|
||||
"%s: failed to register device %i\n",
|
||||
FETCHOP_ID, ret);
|
||||
goto free_scratch_pages;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
ret = misc_register(&cached_miscdev);
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s: failed to register device %i\n",
|
||||
CACHED_ID, ret);
|
||||
if (is_sn2)
|
||||
misc_deregister(&fetchop_miscdev);
|
||||
goto free_scratch_pages;
|
||||
return ret;
|
||||
}
|
||||
ret = misc_register(&uncached_miscdev);
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s: failed to register device %i\n",
|
||||
UNCACHED_ID, ret);
|
||||
misc_deregister(&cached_miscdev);
|
||||
if (is_sn2)
|
||||
misc_deregister(&fetchop_miscdev);
|
||||
goto free_scratch_pages;
|
||||
return ret;
|
||||
}
|
||||
|
||||
printk(KERN_INFO "%s %s initialized devices: %s %s %s\n",
|
||||
MSPEC_BASENAME, REVISION, is_sn2 ? FETCHOP_ID : "",
|
||||
CACHED_ID, UNCACHED_ID);
|
||||
printk(KERN_INFO "%s %s initialized devices: %s %s\n",
|
||||
MSPEC_BASENAME, REVISION, CACHED_ID, UNCACHED_ID);
|
||||
|
||||
return 0;
|
||||
|
||||
free_scratch_pages:
|
||||
for_each_node(nid) {
|
||||
if (scratch_page[nid] != 0)
|
||||
uncached_free_page(scratch_page[nid], 1);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit
|
||||
mspec_exit(void)
|
||||
{
|
||||
int nid;
|
||||
|
||||
misc_deregister(&uncached_miscdev);
|
||||
misc_deregister(&cached_miscdev);
|
||||
if (is_sn2) {
|
||||
misc_deregister(&fetchop_miscdev);
|
||||
|
||||
for_each_node(nid) {
|
||||
if (scratch_page[nid] != 0)
|
||||
uncached_free_page(scratch_page[nid], 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
module_init(mspec_init);
|
||||
|
|
|
|||
Loading…
Reference in New Issue