From 0fef2532d2a17100e57fad0569555536cac47eda Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 13 Aug 2019 09:24:55 +0200 Subject: [PATCH] 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 Link: https://lkml.kernel.org/r/20190813072514.23299-10-hch@lst.de Signed-off-by: Tony Luck --- drivers/char/mspec.c | 155 +++---------------------------------------- 1 file changed, 11 insertions(+), 144 deletions(-) diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c index e75c9df7c2d8..a9d9f074fbd6 100644 --- a/drivers/char/mspec.c +++ b/drivers/char/mspec.c @@ -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 #include #include -#include -#include -#include -#include -#include -#include -#include -#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);