Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 902 deletions

diff --git a/ANDROID_3.4.5/drivers/misc/sgi-gru/grufault.c b/ANDROID_3.4.5/drivers/misc/sgi-gru/grufault.c
deleted file mode 100644
index c4acac74..00000000
--- a/ANDROID_3.4.5/drivers/misc/sgi-gru/grufault.c
+++ /dev/null
@@ -1,902 +0,0 @@
-/*
- * SN Platform GRU Driver
- *
- *              FAULT HANDLER FOR GRU DETECTED TLB MISSES
- *
- * This file contains code that handles TLB misses within the GRU.
- * These misses are reported either via interrupts or user polling of
- * the user CB.
- *
- *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
- */
-
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/spinlock.h>
-#include <linux/mm.h>
-#include <linux/hugetlb.h>
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-#include <linux/security.h>
-#include <linux/prefetch.h>
-#include <asm/pgtable.h>
-#include "gru.h"
-#include "grutables.h"
-#include "grulib.h"
-#include "gru_instructions.h"
-#include <asm/uv/uv_hub.h>
-
-/* Return codes for vtop functions */
-#define VTOP_SUCCESS               0
-#define VTOP_INVALID               -1
-#define VTOP_RETRY                 -2
-
-
-/*
- * Test if a physical address is a valid GRU GSEG address
- */
-static inline int is_gru_paddr(unsigned long paddr)
-{
-	return paddr >= gru_start_paddr && paddr < gru_end_paddr;
-}
-
-/*
- * Find the vma of a GRU segment. Caller must hold mmap_sem.
- */
-struct vm_area_struct *gru_find_vma(unsigned long vaddr)
-{
-	struct vm_area_struct *vma;
-
-	vma = find_vma(current->mm, vaddr);
-	if (vma && vma->vm_start <= vaddr && vma->vm_ops == &gru_vm_ops)
-		return vma;
-	return NULL;
-}
-
-/*
- * Find and lock the gts that contains the specified user vaddr.
- *
- * Returns:
- * 	- *gts with the mmap_sem locked for read and the GTS locked.
- *	- NULL if vaddr invalid OR is not a valid GSEG vaddr.
- */
-
-static struct gru_thread_state *gru_find_lock_gts(unsigned long vaddr)
-{
-	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
-	struct gru_thread_state *gts = NULL;
-
-	down_read(&mm->mmap_sem);
-	vma = gru_find_vma(vaddr);
-	if (vma)
-		gts = gru_find_thread_state(vma, TSID(vaddr, vma));
-	if (gts)
-		mutex_lock(&gts->ts_ctxlock);
-	else
-		up_read(&mm->mmap_sem);
-	return gts;
-}
-
-static struct gru_thread_state *gru_alloc_locked_gts(unsigned long vaddr)
-{
-	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
-	struct gru_thread_state *gts = ERR_PTR(-EINVAL);
-
-	down_write(&mm->mmap_sem);
-	vma = gru_find_vma(vaddr);
-	if (!vma)
-		goto err;
-
-	gts = gru_alloc_thread_state(vma, TSID(vaddr, vma));
-	if (IS_ERR(gts))
-		goto err;
-	mutex_lock(&gts->ts_ctxlock);
-	downgrade_write(&mm->mmap_sem);
-	return gts;
-
-err:
-	up_write(&mm->mmap_sem);
-	return gts;
-}
-
-/*
- * Unlock a GTS that was previously locked with gru_find_lock_gts().
- */
-static void gru_unlock_gts(struct gru_thread_state *gts)
-{
-	mutex_unlock(&gts->ts_ctxlock);
-	up_read(&current->mm->mmap_sem);
-}
-
-/*
- * Set a CB.istatus to active using a user virtual address. This must be done
- * just prior to a TFH RESTART. The new cb.istatus is an in-cache status ONLY.
- * If the line is evicted, the status may be lost. The in-cache update
- * is necessary to prevent the user from seeing a stale cb.istatus that will
- * change as soon as the TFH restart is complete. Races may cause an
- * occasional failure to clear the cb.istatus, but that is ok.
- */
-static void gru_cb_set_istatus_active(struct gru_instruction_bits *cbk)
-{
-	if (cbk) {
-		cbk->istatus = CBS_ACTIVE;
-	}
-}
-
-/*
- * Read & clear a TFM
- *
- * The GRU has an array of fault maps. A map is private to a cpu
- * Only one cpu will be accessing a cpu's fault map.
- *
- * This function scans the cpu-private fault map & clears all bits that
- * are set. The function returns a bitmap that indicates the bits that
- * were cleared. Note that sense the maps may be updated asynchronously by
- * the GRU, atomic operations must be used to clear bits.
- */
-static void get_clear_fault_map(struct gru_state *gru,
-				struct gru_tlb_fault_map *imap,
-				struct gru_tlb_fault_map *dmap)
-{
-	unsigned long i, k;
-	struct gru_tlb_fault_map *tfm;
-
-	tfm = get_tfm_for_cpu(gru, gru_cpu_fault_map_id());
-	prefetchw(tfm);		/* Helps on hardware, required for emulator */
-	for (i = 0; i < BITS_TO_LONGS(GRU_NUM_CBE); i++) {
-		k = tfm->fault_bits[i];
-		if (k)
-			k = xchg(&tfm->fault_bits[i], 0UL);
-		imap->fault_bits[i] = k;
-		k = tfm->done_bits[i];
-		if (k)
-			k = xchg(&tfm->done_bits[i], 0UL);
-		dmap->fault_bits[i] = k;
-	}
-
-	/*
-	 * Not functionally required but helps performance. (Required
-	 * on emulator)
-	 */
-	gru_flush_cache(tfm);
-}
-
-/*
- * Atomic (interrupt context) & non-atomic (user context) functions to
- * convert a vaddr into a physical address. The size of the page
- * is returned in pageshift.
- * 	returns:
- * 		  0 - successful
- * 		< 0 - error code
- * 		  1 - (atomic only) try again in non-atomic context
- */
-static int non_atomic_pte_lookup(struct vm_area_struct *vma,
-				 unsigned long vaddr, int write,
-				 unsigned long *paddr, int *pageshift)
-{
-	struct page *page;
-
-#ifdef CONFIG_HUGETLB_PAGE
-	*pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT;
-#else
-	*pageshift = PAGE_SHIFT;
-#endif
-	if (get_user_pages
-	    (current, current->mm, vaddr, 1, write, 0, &page, NULL) <= 0)
-		return -EFAULT;
-	*paddr = page_to_phys(page);
-	put_page(page);
-	return 0;
-}
-
-/*
- * atomic_pte_lookup
- *
- * Convert a user virtual address to a physical address
- * Only supports Intel large pages (2MB only) on x86_64.
- *	ZZZ - hugepage support is incomplete
- *
- * NOTE: mmap_sem is already held on entry to this function. This
- * guarantees existence of the page tables.
- */
-static int atomic_pte_lookup(struct vm_area_struct *vma, unsigned long vaddr,
-	int write, unsigned long *paddr, int *pageshift)
-{
-	pgd_t *pgdp;
-	pmd_t *pmdp;
-	pud_t *pudp;
-	pte_t pte;
-
-	pgdp = pgd_offset(vma->vm_mm, vaddr);
-	if (unlikely(pgd_none(*pgdp)))
-		goto err;
-
-	pudp = pud_offset(pgdp, vaddr);
-	if (unlikely(pud_none(*pudp)))
-		goto err;
-
-	pmdp = pmd_offset(pudp, vaddr);
-	if (unlikely(pmd_none(*pmdp)))
-		goto err;
-#ifdef CONFIG_X86_64
-	if (unlikely(pmd_large(*pmdp)))
-		pte = *(pte_t *) pmdp;
-	else
-#endif
-		pte = *pte_offset_kernel(pmdp, vaddr);
-
-	if (unlikely(!pte_present(pte) ||
-		     (write && (!pte_write(pte) || !pte_dirty(pte)))))
-		return 1;
-
-	*paddr = pte_pfn(pte) << PAGE_SHIFT;
-#ifdef CONFIG_HUGETLB_PAGE
-	*pageshift = is_vm_hugetlb_page(vma) ? HPAGE_SHIFT : PAGE_SHIFT;
-#else
-	*pageshift = PAGE_SHIFT;
-#endif
-	return 0;
-
-err:
-	return 1;
-}
-
-static int gru_vtop(struct gru_thread_state *gts, unsigned long vaddr,
-		    int write, int atomic, unsigned long *gpa, int *pageshift)
-{
-	struct mm_struct *mm = gts->ts_mm;
-	struct vm_area_struct *vma;
-	unsigned long paddr;
-	int ret, ps;
-
-	vma = find_vma(mm, vaddr);
-	if (!vma)
-		goto inval;
-
-	/*
-	 * Atomic lookup is faster & usually works even if called in non-atomic
-	 * context.
-	 */
-	rmb();	/* Must/check ms_range_active before loading PTEs */
-	ret = atomic_pte_lookup(vma, vaddr, write, &paddr, &ps);
-	if (ret) {
-		if (atomic)
-			goto upm;
-		if (non_atomic_pte_lookup(vma, vaddr, write, &paddr, &ps))
-			goto inval;
-	}
-	if (is_gru_paddr(paddr))
-		goto inval;
-	paddr = paddr & ~((1UL << ps) - 1);
-	*gpa = uv_soc_phys_ram_to_gpa(paddr);
-	*pageshift = ps;
-	return VTOP_SUCCESS;
-
-inval:
-	return VTOP_INVALID;
-upm:
-	return VTOP_RETRY;
-}
-
-
-/*
- * Flush a CBE from cache. The CBE is clean in the cache. Dirty the
- * CBE cacheline so that the line will be written back to home agent.
- * Otherwise the line may be silently dropped. This has no impact
- * except on performance.
- */
-static void gru_flush_cache_cbe(struct gru_control_block_extended *cbe)
-{
-	if (unlikely(cbe)) {
-		cbe->cbrexecstatus = 0;         /* make CL dirty */
-		gru_flush_cache(cbe);
-	}
-}
-
-/*
- * Preload the TLB with entries that may be required. Currently, preloading
- * is implemented only for BCOPY. Preload  <tlb_preload_count> pages OR to
- * the end of the bcopy tranfer, whichever is smaller.
- */
-static void gru_preload_tlb(struct gru_state *gru,
-			struct gru_thread_state *gts, int atomic,
-			unsigned long fault_vaddr, int asid, int write,
-			unsigned char tlb_preload_count,
-			struct gru_tlb_fault_handle *tfh,
-			struct gru_control_block_extended *cbe)
-{
-	unsigned long vaddr = 0, gpa;
-	int ret, pageshift;
-
-	if (cbe->opccpy != OP_BCOPY)
-		return;
-
-	if (fault_vaddr == cbe->cbe_baddr0)
-		vaddr = fault_vaddr + GRU_CACHE_LINE_BYTES * cbe->cbe_src_cl - 1;
-	else if (fault_vaddr == cbe->cbe_baddr1)
-		vaddr = fault_vaddr + (1 << cbe->xtypecpy) * cbe->cbe_nelemcur - 1;
-
-	fault_vaddr &= PAGE_MASK;
-	vaddr &= PAGE_MASK;
-	vaddr = min(vaddr, fault_vaddr + tlb_preload_count * PAGE_SIZE);
-
-	while (vaddr > fault_vaddr) {
-		ret = gru_vtop(gts, vaddr, write, atomic, &gpa, &pageshift);
-		if (ret || tfh_write_only(tfh, gpa, GAA_RAM, vaddr, asid, write,
-					  GRU_PAGESIZE(pageshift)))
-			return;
-		gru_dbg(grudev,
-			"%s: gid %d, gts 0x%p, tfh 0x%p, vaddr 0x%lx, asid 0x%x, rw %d, ps %d, gpa 0x%lx\n",
-			atomic ? "atomic" : "non-atomic", gru->gs_gid, gts, tfh,
-			vaddr, asid, write, pageshift, gpa);
-		vaddr -= PAGE_SIZE;
-		STAT(tlb_preload_page);
-	}
-}
-
-/*
- * Drop a TLB entry into the GRU. The fault is described by info in an TFH.
- *	Input:
- *		cb    Address of user CBR. Null if not running in user context
- * 	Return:
- * 		  0 = dropin, exception, or switch to UPM successful
- * 		  1 = range invalidate active
- * 		< 0 = error code
- *
- */
-static int gru_try_dropin(struct gru_state *gru,
-			  struct gru_thread_state *gts,
-			  struct gru_tlb_fault_handle *tfh,
-			  struct gru_instruction_bits *cbk)
-{
-	struct gru_control_block_extended *cbe = NULL;
-	unsigned char tlb_preload_count = gts->ts_tlb_preload_count;
-	int pageshift = 0, asid, write, ret, atomic = !cbk, indexway;
-	unsigned long gpa = 0, vaddr = 0;
-
-	/*
-	 * NOTE: The GRU contains magic hardware that eliminates races between
-	 * TLB invalidates and TLB dropins. If an invalidate occurs
-	 * in the window between reading the TFH and the subsequent TLB dropin,
-	 * the dropin is ignored. This eliminates the need for additional locks.
-	 */
-
-	/*
-	 * Prefetch the CBE if doing TLB preloading
-	 */
-	if (unlikely(tlb_preload_count)) {
-		cbe = gru_tfh_to_cbe(tfh);
-		prefetchw(cbe);
-	}
-
-	/*
-	 * Error if TFH state is IDLE or FMM mode & the user issuing a UPM call.
-	 * Might be a hardware race OR a stupid user. Ignore FMM because FMM
-	 * is a transient state.
-	 */
-	if (tfh->status != TFHSTATUS_EXCEPTION) {
-		gru_flush_cache(tfh);
-		sync_core();
-		if (tfh->status != TFHSTATUS_EXCEPTION)
-			goto failnoexception;
-		STAT(tfh_stale_on_fault);
-	}
-	if (tfh->state == TFHSTATE_IDLE)
-		goto failidle;
-	if (tfh->state == TFHSTATE_MISS_FMM && cbk)
-		goto failfmm;
-
-	write = (tfh->cause & TFHCAUSE_TLB_MOD) != 0;
-	vaddr = tfh->missvaddr;
-	asid = tfh->missasid;
-	indexway = tfh->indexway;
-	if (asid == 0)
-		goto failnoasid;
-
-	rmb();	/* TFH must be cache resident before reading ms_range_active */
-
-	/*
-	 * TFH is cache resident - at least briefly. Fail the dropin
-	 * if a range invalidate is active.
-	 */
-	if (atomic_read(&gts->ts_gms->ms_range_active))
-		goto failactive;
-
-	ret = gru_vtop(gts, vaddr, write, atomic, &gpa, &pageshift);
-	if (ret == VTOP_INVALID)
-		goto failinval;
-	if (ret == VTOP_RETRY)
-		goto failupm;
-
-	if (!(gts->ts_sizeavail & GRU_SIZEAVAIL(pageshift))) {
-		gts->ts_sizeavail |= GRU_SIZEAVAIL(pageshift);
-		if (atomic || !gru_update_cch(gts)) {
-			gts->ts_force_cch_reload = 1;
-			goto failupm;
-		}
-	}
-
-	if (unlikely(cbe) && pageshift == PAGE_SHIFT) {
-		gru_preload_tlb(gru, gts, atomic, vaddr, asid, write, tlb_preload_count, tfh, cbe);
-		gru_flush_cache_cbe(cbe);
-	}
-
-	gru_cb_set_istatus_active(cbk);
-	gts->ustats.tlbdropin++;
-	tfh_write_restart(tfh, gpa, GAA_RAM, vaddr, asid, write,
-			  GRU_PAGESIZE(pageshift));
-	gru_dbg(grudev,
-		"%s: gid %d, gts 0x%p, tfh 0x%p, vaddr 0x%lx, asid 0x%x, indexway 0x%x,"
-		" rw %d, ps %d, gpa 0x%lx\n",
-		atomic ? "atomic" : "non-atomic", gru->gs_gid, gts, tfh, vaddr, asid,
-		indexway, write, pageshift, gpa);
-	STAT(tlb_dropin);
-	return 0;
-
-failnoasid:
-	/* No asid (delayed unload). */
-	STAT(tlb_dropin_fail_no_asid);
-	gru_dbg(grudev, "FAILED no_asid tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
-	if (!cbk)
-		tfh_user_polling_mode(tfh);
-	else
-		gru_flush_cache(tfh);
-	gru_flush_cache_cbe(cbe);
-	return -EAGAIN;
-
-failupm:
-	/* Atomic failure switch CBR to UPM */
-	tfh_user_polling_mode(tfh);
-	gru_flush_cache_cbe(cbe);
-	STAT(tlb_dropin_fail_upm);
-	gru_dbg(grudev, "FAILED upm tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
-	return 1;
-
-failfmm:
-	/* FMM state on UPM call */
-	gru_flush_cache(tfh);
-	gru_flush_cache_cbe(cbe);
-	STAT(tlb_dropin_fail_fmm);
-	gru_dbg(grudev, "FAILED fmm tfh: 0x%p, state %d\n", tfh, tfh->state);
-	return 0;
-
-failnoexception:
-	/* TFH status did not show exception pending */
-	gru_flush_cache(tfh);
-	gru_flush_cache_cbe(cbe);
-	if (cbk)
-		gru_flush_cache(cbk);
-	STAT(tlb_dropin_fail_no_exception);
-	gru_dbg(grudev, "FAILED non-exception tfh: 0x%p, status %d, state %d\n",
-		tfh, tfh->status, tfh->state);
-	return 0;
-
-failidle:
-	/* TFH state was idle  - no miss pending */
-	gru_flush_cache(tfh);
-	gru_flush_cache_cbe(cbe);
-	if (cbk)
-		gru_flush_cache(cbk);
-	STAT(tlb_dropin_fail_idle);
-	gru_dbg(grudev, "FAILED idle tfh: 0x%p, state %d\n", tfh, tfh->state);
-	return 0;
-
-failinval:
-	/* All errors (atomic & non-atomic) switch CBR to EXCEPTION state */
-	tfh_exception(tfh);
-	gru_flush_cache_cbe(cbe);
-	STAT(tlb_dropin_fail_invalid);
-	gru_dbg(grudev, "FAILED inval tfh: 0x%p, vaddr 0x%lx\n", tfh, vaddr);
-	return -EFAULT;
-
-failactive:
-	/* Range invalidate active. Switch to UPM iff atomic */
-	if (!cbk)
-		tfh_user_polling_mode(tfh);
-	else
-		gru_flush_cache(tfh);
-	gru_flush_cache_cbe(cbe);
-	STAT(tlb_dropin_fail_range_active);
-	gru_dbg(grudev, "FAILED range active: tfh 0x%p, vaddr 0x%lx\n",
-		tfh, vaddr);
-	return 1;
-}
-
-/*
- * Process an external interrupt from the GRU. This interrupt is
- * caused by a TLB miss.
- * Note that this is the interrupt handler that is registered with linux
- * interrupt handlers.
- */
-static irqreturn_t gru_intr(int chiplet, int blade)
-{
-	struct gru_state *gru;
-	struct gru_tlb_fault_map imap, dmap;
-	struct gru_thread_state *gts;
-	struct gru_tlb_fault_handle *tfh = NULL;
-	struct completion *cmp;
-	int cbrnum, ctxnum;
-
-	STAT(intr);
-
-	gru = &gru_base[blade]->bs_grus[chiplet];
-	if (!gru) {
-		dev_err(grudev, "GRU: invalid interrupt: cpu %d, chiplet %d\n",
-			raw_smp_processor_id(), chiplet);
-		return IRQ_NONE;
-	}
-	get_clear_fault_map(gru, &imap, &dmap);
-	gru_dbg(grudev,
-		"cpu %d, chiplet %d, gid %d, imap %016lx %016lx, dmap %016lx %016lx\n",
-		smp_processor_id(), chiplet, gru->gs_gid,
-		imap.fault_bits[0], imap.fault_bits[1],
-		dmap.fault_bits[0], dmap.fault_bits[1]);
-
-	for_each_cbr_in_tfm(cbrnum, dmap.fault_bits) {
-		STAT(intr_cbr);
-		cmp = gru->gs_blade->bs_async_wq;
-		if (cmp)
-			complete(cmp);
-		gru_dbg(grudev, "gid %d, cbr_done %d, done %d\n",
-			gru->gs_gid, cbrnum, cmp ? cmp->done : -1);
-	}
-
-	for_each_cbr_in_tfm(cbrnum, imap.fault_bits) {
-		STAT(intr_tfh);
-		tfh = get_tfh_by_index(gru, cbrnum);
-		prefetchw(tfh);	/* Helps on hdw, required for emulator */
-
-		/*
-		 * When hardware sets a bit in the faultmap, it implicitly
-		 * locks the GRU context so that it cannot be unloaded.
-		 * The gts cannot change until a TFH start/writestart command
-		 * is issued.
-		 */
-		ctxnum = tfh->ctxnum;
-		gts = gru->gs_gts[ctxnum];
-
-		/* Spurious interrupts can cause this. Ignore. */
-		if (!gts) {
-			STAT(intr_spurious);
-			continue;
-		}
-
-		/*
-		 * This is running in interrupt context. Trylock the mmap_sem.
-		 * If it fails, retry the fault in user context.
-		 */
-		gts->ustats.fmm_tlbmiss++;
-		if (!gts->ts_force_cch_reload &&
-					down_read_trylock(&gts->ts_mm->mmap_sem)) {
-			gru_try_dropin(gru, gts, tfh, NULL);
-			up_read(&gts->ts_mm->mmap_sem);
-		} else {
-			tfh_user_polling_mode(tfh);
-			STAT(intr_mm_lock_failed);
-		}
-	}
-	return IRQ_HANDLED;
-}
-
-irqreturn_t gru0_intr(int irq, void *dev_id)
-{
-	return gru_intr(0, uv_numa_blade_id());
-}
-
-irqreturn_t gru1_intr(int irq, void *dev_id)
-{
-	return gru_intr(1, uv_numa_blade_id());
-}
-
-irqreturn_t gru_intr_mblade(int irq, void *dev_id)
-{
-	int blade;
-
-	for_each_possible_blade(blade) {
-		if (uv_blade_nr_possible_cpus(blade))
-			continue;
-		 gru_intr(0, blade);
-		 gru_intr(1, blade);
-	}
-	return IRQ_HANDLED;
-}
-
-
-static int gru_user_dropin(struct gru_thread_state *gts,
-			   struct gru_tlb_fault_handle *tfh,
-			   void *cb)
-{
-	struct gru_mm_struct *gms = gts->ts_gms;
-	int ret;
-
-	gts->ustats.upm_tlbmiss++;
-	while (1) {
-		wait_event(gms->ms_wait_queue,
-			   atomic_read(&gms->ms_range_active) == 0);
-		prefetchw(tfh);	/* Helps on hdw, required for emulator */
-		ret = gru_try_dropin(gts->ts_gru, gts, tfh, cb);
-		if (ret <= 0)
-			return ret;
-		STAT(call_os_wait_queue);
-	}
-}
-
-/*
- * This interface is called as a result of a user detecting a "call OS" bit
- * in a user CB. Normally means that a TLB fault has occurred.
- * 	cb - user virtual address of the CB
- */
-int gru_handle_user_call_os(unsigned long cb)
-{
-	struct gru_tlb_fault_handle *tfh;
-	struct gru_thread_state *gts;
-	void *cbk;
-	int ucbnum, cbrnum, ret = -EINVAL;
-
-	STAT(call_os);
-
-	/* sanity check the cb pointer */
-	ucbnum = get_cb_number((void *)cb);
-	if ((cb & (GRU_HANDLE_STRIDE - 1)) || ucbnum >= GRU_NUM_CB)
-		return -EINVAL;
-
-	gts = gru_find_lock_gts(cb);
-	if (!gts)
-		return -EINVAL;
-	gru_dbg(grudev, "address 0x%lx, gid %d, gts 0x%p\n", cb, gts->ts_gru ? gts->ts_gru->gs_gid : -1, gts);
-
-	if (ucbnum >= gts->ts_cbr_au_count * GRU_CBR_AU_SIZE)
-		goto exit;
-
-	gru_check_context_placement(gts);
-
-	/*
-	 * CCH may contain stale data if ts_force_cch_reload is set.
-	 */
-	if (gts->ts_gru && gts->ts_force_cch_reload) {
-		gts->ts_force_cch_reload = 0;
-		gru_update_cch(gts);
-	}
-
-	ret = -EAGAIN;
-	cbrnum = thread_cbr_number(gts, ucbnum);
-	if (gts->ts_gru) {
-		tfh = get_tfh_by_index(gts->ts_gru, cbrnum);
-		cbk = get_gseg_base_address_cb(gts->ts_gru->gs_gru_base_vaddr,
-				gts->ts_ctxnum, ucbnum);
-		ret = gru_user_dropin(gts, tfh, cbk);
-	}
-exit:
-	gru_unlock_gts(gts);
-	return ret;
-}
-
-/*
- * Fetch the exception detail information for a CB that terminated with
- * an exception.
- */
-int gru_get_exception_detail(unsigned long arg)
-{
-	struct control_block_extended_exc_detail excdet;
-	struct gru_control_block_extended *cbe;
-	struct gru_thread_state *gts;
-	int ucbnum, cbrnum, ret;
-
-	STAT(user_exception);
-	if (copy_from_user(&excdet, (void __user *)arg, sizeof(excdet)))
-		return -EFAULT;
-
-	gts = gru_find_lock_gts(excdet.cb);
-	if (!gts)
-		return -EINVAL;
-
-	gru_dbg(grudev, "address 0x%lx, gid %d, gts 0x%p\n", excdet.cb, gts->ts_gru ? gts->ts_gru->gs_gid : -1, gts);
-	ucbnum = get_cb_number((void *)excdet.cb);
-	if (ucbnum >= gts->ts_cbr_au_count * GRU_CBR_AU_SIZE) {
-		ret = -EINVAL;
-	} else if (gts->ts_gru) {
-		cbrnum = thread_cbr_number(gts, ucbnum);
-		cbe = get_cbe_by_index(gts->ts_gru, cbrnum);
-		gru_flush_cache(cbe);	/* CBE not coherent */
-		sync_core();		/* make sure we are have current data */
-		excdet.opc = cbe->opccpy;
-		excdet.exopc = cbe->exopccpy;
-		excdet.ecause = cbe->ecause;
-		excdet.exceptdet0 = cbe->idef1upd;
-		excdet.exceptdet1 = cbe->idef3upd;
-		excdet.cbrstate = cbe->cbrstate;
-		excdet.cbrexecstatus = cbe->cbrexecstatus;
-		gru_flush_cache_cbe(cbe);
-		ret = 0;
-	} else {
-		ret = -EAGAIN;
-	}
-	gru_unlock_gts(gts);
-
-	gru_dbg(grudev,
-		"cb 0x%lx, op %d, exopc %d, cbrstate %d, cbrexecstatus 0x%x, ecause 0x%x, "
-		"exdet0 0x%lx, exdet1 0x%x\n",
-		excdet.cb, excdet.opc, excdet.exopc, excdet.cbrstate, excdet.cbrexecstatus,
-		excdet.ecause, excdet.exceptdet0, excdet.exceptdet1);
-	if (!ret && copy_to_user((void __user *)arg, &excdet, sizeof(excdet)))
-		ret = -EFAULT;
-	return ret;
-}
-
-/*
- * User request to unload a context. Content is saved for possible reload.
- */
-static int gru_unload_all_contexts(void)
-{
-	struct gru_thread_state *gts;
-	struct gru_state *gru;
-	int gid, ctxnum;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-	foreach_gid(gid) {
-		gru = GID_TO_GRU(gid);
-		spin_lock(&gru->gs_lock);
-		for (ctxnum = 0; ctxnum < GRU_NUM_CCH; ctxnum++) {
-			gts = gru->gs_gts[ctxnum];
-			if (gts && mutex_trylock(&gts->ts_ctxlock)) {
-				spin_unlock(&gru->gs_lock);
-				gru_unload_context(gts, 1);
-				mutex_unlock(&gts->ts_ctxlock);
-				spin_lock(&gru->gs_lock);
-			}
-		}
-		spin_unlock(&gru->gs_lock);
-	}
-	return 0;
-}
-
-int gru_user_unload_context(unsigned long arg)
-{
-	struct gru_thread_state *gts;
-	struct gru_unload_context_req req;
-
-	STAT(user_unload_context);
-	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
-		return -EFAULT;
-
-	gru_dbg(grudev, "gseg 0x%lx\n", req.gseg);
-
-	if (!req.gseg)
-		return gru_unload_all_contexts();
-
-	gts = gru_find_lock_gts(req.gseg);
-	if (!gts)
-		return -EINVAL;
-
-	if (gts->ts_gru)
-		gru_unload_context(gts, 1);
-	gru_unlock_gts(gts);
-
-	return 0;
-}
-
-/*
- * User request to flush a range of virtual addresses from the GRU TLB
- * (Mainly for testing).
- */
-int gru_user_flush_tlb(unsigned long arg)
-{
-	struct gru_thread_state *gts;
-	struct gru_flush_tlb_req req;
-	struct gru_mm_struct *gms;
-
-	STAT(user_flush_tlb);
-	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
-		return -EFAULT;
-
-	gru_dbg(grudev, "gseg 0x%lx, vaddr 0x%lx, len 0x%lx\n", req.gseg,
-		req.vaddr, req.len);
-
-	gts = gru_find_lock_gts(req.gseg);
-	if (!gts)
-		return -EINVAL;
-
-	gms = gts->ts_gms;
-	gru_unlock_gts(gts);
-	gru_flush_tlb_range(gms, req.vaddr, req.len);
-
-	return 0;
-}
-
-/*
- * Fetch GSEG statisticss
- */
-long gru_get_gseg_statistics(unsigned long arg)
-{
-	struct gru_thread_state *gts;
-	struct gru_get_gseg_statistics_req req;
-
-	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
-		return -EFAULT;
-
-	/*
-	 * The library creates arrays of contexts for threaded programs.
-	 * If no gts exists in the array, the context has never been used & all
-	 * statistics are implicitly 0.
-	 */
-	gts = gru_find_lock_gts(req.gseg);
-	if (gts) {
-		memcpy(&req.stats, &gts->ustats, sizeof(gts->ustats));
-		gru_unlock_gts(gts);
-	} else {
-		memset(&req.stats, 0, sizeof(gts->ustats));
-	}
-
-	if (copy_to_user((void __user *)arg, &req, sizeof(req)))
-		return -EFAULT;
-
-	return 0;
-}
-
-/*
- * Register the current task as the user of the GSEG slice.
- * Needed for TLB fault interrupt targeting.
- */
-int gru_set_context_option(unsigned long arg)
-{
-	struct gru_thread_state *gts;
-	struct gru_set_context_option_req req;
-	int ret = 0;
-
-	STAT(set_context_option);
-	if (copy_from_user(&req, (void __user *)arg, sizeof(req)))
-		return -EFAULT;
-	gru_dbg(grudev, "op %d, gseg 0x%lx, value1 0x%lx\n", req.op, req.gseg, req.val1);
-
-	gts = gru_find_lock_gts(req.gseg);
-	if (!gts) {
-		gts = gru_alloc_locked_gts(req.gseg);
-		if (IS_ERR(gts))
-			return PTR_ERR(gts);
-	}
-
-	switch (req.op) {
-	case sco_blade_chiplet:
-		/* Select blade/chiplet for GRU context */
-		if (req.val1 < -1 || req.val1 >= GRU_MAX_BLADES || !gru_base[req.val1] ||
-		    req.val0 < -1 || req.val0 >= GRU_CHIPLETS_PER_HUB) {
-			ret = -EINVAL;
-		} else {
-			gts->ts_user_blade_id = req.val1;
-			gts->ts_user_chiplet_id = req.val0;
-			gru_check_context_placement(gts);
-		}
-		break;
-	case sco_gseg_owner:
- 		/* Register the current task as the GSEG owner */
-		gts->ts_tgid_owner = current->tgid;
-		break;
-	case sco_cch_req_slice:
- 		/* Set the CCH slice option */
-		gts->ts_cch_req_slice = req.val1 & 3;
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	gru_unlock_gts(gts);
-
-	return ret;
-}