1 files changed, 0 insertions, 271 deletions
diff --git a/drivers/misc/cxl/cxllib.c b/drivers/misc/cxl/cxllib.c
deleted file mode 100644
index e5fe0a171472..000000000000
--- a/drivers/misc/cxl/cxllib.c
+++ /dev/null
@@ -1,271 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright 2017 IBM Corp.
- */
-
-#include <linux/hugetlb.h>
-#include <linux/sched/mm.h>
-#include <asm/opal-api.h>
-#include <asm/pnv-pci.h>
-#include <misc/cxllib.h>
-
-#include "cxl.h"
-
-#define CXL_INVALID_DRA                 ~0ull
-#define CXL_DUMMY_READ_SIZE             128
-#define CXL_DUMMY_READ_ALIGN            8
-#define CXL_CAPI_WINDOW_START           0x2000000000000ull
-#define CXL_CAPI_WINDOW_LOG_SIZE        48
-#define CXL_XSL_CONFIG_CURRENT_VERSION  CXL_XSL_CONFIG_VERSION1
-
-
-bool cxllib_slot_is_supported(struct pci_dev *dev, unsigned long flags)
-{
-	int rc;
-	u32 phb_index;
-	u64 chip_id, capp_unit_id;
-
-	/* No flags currently supported */
-	if (flags)
-		return false;
-
-	if (!cpu_has_feature(CPU_FTR_HVMODE))
-		return false;
-
-	if (!cxl_is_power9())
-		return false;
-
-	if (cxl_slot_is_switched(dev))
-		return false;
-
-	/* on p9, some pci slots are not connected to a CAPP unit */
-	rc = cxl_calc_capp_routing(dev, &chip_id, &phb_index, &capp_unit_id);
-	if (rc)
-		return false;
-
-	return true;
-}
-EXPORT_SYMBOL_GPL(cxllib_slot_is_supported);
-
-static DEFINE_MUTEX(dra_mutex);
-static u64 dummy_read_addr = CXL_INVALID_DRA;
-
-static int allocate_dummy_read_buf(void)
-{
-	u64 buf, vaddr;
-	size_t buf_size;
-
-	/*
-	 * Dummy read buffer is 128-byte long, aligned on a
-	 * 256-byte boundary and we need the physical address.
-	 */
-	buf_size = CXL_DUMMY_READ_SIZE + (1ull << CXL_DUMMY_READ_ALIGN);
-	buf = (u64) kzalloc(buf_size, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
-	vaddr = (buf + (1ull << CXL_DUMMY_READ_ALIGN) - 1) &
-					(~0ull << CXL_DUMMY_READ_ALIGN);
-
-	WARN((vaddr + CXL_DUMMY_READ_SIZE) > (buf + buf_size),
-		"Dummy read buffer alignment issue");
-	dummy_read_addr = virt_to_phys((void *) vaddr);
-	return 0;
-}
-
-int cxllib_get_xsl_config(struct pci_dev *dev, struct cxllib_xsl_config *cfg)
-{
-	int rc;
-	u32 phb_index;
-	u64 chip_id, capp_unit_id;
-
-	if (!cpu_has_feature(CPU_FTR_HVMODE))
-		return -EINVAL;
-
-	mutex_lock(&dra_mutex);
-	if (dummy_read_addr == CXL_INVALID_DRA) {
-		rc = allocate_dummy_read_buf();
-		if (rc) {
-			mutex_unlock(&dra_mutex);
-			return rc;
-		}
-	}
-	mutex_unlock(&dra_mutex);
-
-	rc = cxl_calc_capp_routing(dev, &chip_id, &phb_index, &capp_unit_id);
-	if (rc)
-		return rc;
-
-	rc = cxl_get_xsl9_dsnctl(dev, capp_unit_id, &cfg->dsnctl);
-	if (rc)
-		return rc;
-
-	cfg->version  = CXL_XSL_CONFIG_CURRENT_VERSION;
-	cfg->log_bar_size = CXL_CAPI_WINDOW_LOG_SIZE;
-	cfg->bar_addr = CXL_CAPI_WINDOW_START;
-	cfg->dra = dummy_read_addr;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cxllib_get_xsl_config);
-
-int cxllib_switch_phb_mode(struct pci_dev *dev, enum cxllib_mode mode,
-			unsigned long flags)
-{
-	int rc = 0;
-
-	if (!cpu_has_feature(CPU_FTR_HVMODE))
-		return -EINVAL;
-
-	switch (mode) {
-	case CXL_MODE_PCI:
-		/*
-		 * We currently don't support going back to PCI mode
-		 * However, we'll turn the invalidations off, so that
-		 * the firmware doesn't have to ack them and can do
-		 * things like reset, etc.. with no worries.
-		 * So always return EPERM (can't go back to PCI) or
-		 * EBUSY if we couldn't even turn off snooping
-		 */
-		rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_OFF);
-		if (rc)
-			rc = -EBUSY;
-		else
-			rc = -EPERM;
-		break;
-	case CXL_MODE_CXL:
-		/* DMA only supported on TVT1 for the time being */
-		if (flags != CXL_MODE_DMA_TVT1)
-			return -EINVAL;
-		rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_DMA_TVT1);
-		if (rc)
-			return rc;
-		rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON);
-		break;
-	default:
-		rc = -EINVAL;
-	}
-	return rc;
-}
-EXPORT_SYMBOL_GPL(cxllib_switch_phb_mode);
-
-/*
- * When switching the PHB to capi mode, the TVT#1 entry for
- * the Partitionable Endpoint is set in bypass mode, like
- * in PCI mode.
- * Configure the device dma to use TVT#1, which is done
- * by calling dma_set_mask() with a mask large enough.
- */
-int cxllib_set_device_dma(struct pci_dev *dev, unsigned long flags)
-{
-	int rc;
-
-	if (flags)
-		return -EINVAL;
-
-	rc = dma_set_mask(&dev->dev, DMA_BIT_MASK(64));
-	return rc;
-}
-EXPORT_SYMBOL_GPL(cxllib_set_device_dma);
-
-int cxllib_get_PE_attributes(struct task_struct *task,
-			     unsigned long translation_mode,
-			     struct cxllib_pe_attributes *attr)
-{
-	if (translation_mode != CXL_TRANSLATED_MODE &&
-		translation_mode != CXL_REAL_MODE)
-		return -EINVAL;
-
-	attr->sr = cxl_calculate_sr(false,
-				task == NULL,
-				translation_mode == CXL_REAL_MODE,
-				true);
-	attr->lpid = mfspr(SPRN_LPID);
-	if (task) {
-		struct mm_struct *mm = get_task_mm(task);
-		if (mm == NULL)
-			return -EINVAL;
-		/*
-		 * Caller is keeping a reference on mm_users for as long
-		 * as XSL uses the memory context
-		 */
-		attr->pid = mm->context.id;
-		mmput(mm);
-		attr->tid = task->thread.tidr;
-	} else {
-		attr->pid = 0;
-		attr->tid = 0;
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cxllib_get_PE_attributes);
-
-static int get_vma_info(struct mm_struct *mm, u64 addr,
-			u64 *vma_start, u64 *vma_end,
-			unsigned long *page_size)
-{
-	struct vm_area_struct *vma = NULL;
-	int rc = 0;
-
-	mmap_read_lock(mm);
-
-	vma = find_vma(mm, addr);
-	if (!vma) {
-		rc = -EFAULT;
-		goto out;
-	}
-	*page_size = vma_kernel_pagesize(vma);
-	*vma_start = vma->vm_start;
-	*vma_end = vma->vm_end;
-out:
-	mmap_read_unlock(mm);
-	return rc;
-}
-
-int cxllib_handle_fault(struct mm_struct *mm, u64 addr, u64 size, u64 flags)
-{
-	int rc;
-	u64 dar, vma_start, vma_end;
-	unsigned long page_size;
-
-	if (mm == NULL)
-		return -EFAULT;
-
-	/*
-	 * The buffer we have to process can extend over several pages
-	 * and may also cover several VMAs.
-	 * We iterate over all the pages. The page size could vary
-	 * between VMAs.
-	 */
-	rc = get_vma_info(mm, addr, &vma_start, &vma_end, &page_size);
-	if (rc)
-		return rc;
-
-	for (dar = (addr & ~(page_size - 1)); dar < (addr + size);
-	     dar += page_size) {
-		if (dar < vma_start || dar >= vma_end) {
-			/*
-			 * We don't hold mm->mmap_lock while iterating, since
-			 * the lock is required by one of the lower-level page
-			 * fault processing functions and it could
-			 * create a deadlock.
-			 *
-			 * It means the VMAs can be altered between 2
-			 * loop iterations and we could theoretically
-			 * miss a page (however unlikely). But that's
-			 * not really a problem, as the driver will
-			 * retry access, get another page fault on the
-			 * missing page and call us again.
-			 */
-			rc = get_vma_info(mm, dar, &vma_start, &vma_end,
-					&page_size);
-			if (rc)
-				return rc;
-		}
-
-		rc = cxl_handle_mm_fault(mm, flags, dar);
-		if (rc)
-			return -EFAULT;
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(cxllib_handle_fault);