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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-03-07 14:42:35 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-03-07 14:42:35 +0000
commit3ba4cea21901d90d703b52e4a806fbafa86037a6 (patch)
treeb556d880492a783861a39c8197e35d56ac4c77f9 /drivers/xen/xencomm.c
parenta2e6177c931793b4ffb30e722fce6fc7aaff9fa5 (diff)
parent8e781f65423c2e8e65a56972ba996b6c01a5ef3e (diff)
Merge branch 'for-rmk/perf' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into devel-stable
* Support for Qualcomm Krait processors (run perf on your phone!) * Support for Cortex-A12 (run perf stat on your FPGA!) * Support for perf_sample_event_took, allowing us to automatically decrease the sample rate if we can't handle the PMU interrupts quickly enough (run perf record on your FPGA!). As part of the Krait support, we also gain support for PPI generation by the PMU.
Diffstat (limited to 'drivers/xen/xencomm.c')
-rw-r--r--drivers/xen/xencomm.c219
1 files changed, 0 insertions, 219 deletions
diff --git a/drivers/xen/xencomm.c b/drivers/xen/xencomm.c
deleted file mode 100644
index 4793fc594549..000000000000
--- a/drivers/xen/xencomm.c
+++ /dev/null
@@ -1,219 +0,0 @@
-/*
- * 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
- *
- * Copyright (C) IBM Corp. 2006
- *
- * Authors: Hollis Blanchard <hollisb@us.ibm.com>
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <asm/page.h>
-#include <xen/xencomm.h>
-#include <xen/interface/xen.h>
-#include <asm/xen/xencomm.h> /* for xencomm_is_phys_contiguous() */
-
-static int xencomm_init(struct xencomm_desc *desc,
- void *buffer, unsigned long bytes)
-{
- unsigned long recorded = 0;
- int i = 0;
-
- while ((recorded < bytes) && (i < desc->nr_addrs)) {
- unsigned long vaddr = (unsigned long)buffer + recorded;
- unsigned long paddr;
- int offset;
- int chunksz;
-
- offset = vaddr % PAGE_SIZE; /* handle partial pages */
- chunksz = min(PAGE_SIZE - offset, bytes - recorded);
-
- paddr = xencomm_vtop(vaddr);
- if (paddr == ~0UL) {
- printk(KERN_DEBUG "%s: couldn't translate vaddr %lx\n",
- __func__, vaddr);
- return -EINVAL;
- }
-
- desc->address[i++] = paddr;
- recorded += chunksz;
- }
-
- if (recorded < bytes) {
- printk(KERN_DEBUG
- "%s: could only translate %ld of %ld bytes\n",
- __func__, recorded, bytes);
- return -ENOSPC;
- }
-
- /* mark remaining addresses invalid (just for safety) */
- while (i < desc->nr_addrs)
- desc->address[i++] = XENCOMM_INVALID;
-
- desc->magic = XENCOMM_MAGIC;
-
- return 0;
-}
-
-static struct xencomm_desc *xencomm_alloc(gfp_t gfp_mask,
- void *buffer, unsigned long bytes)
-{
- struct xencomm_desc *desc;
- unsigned long buffer_ulong = (unsigned long)buffer;
- unsigned long start = buffer_ulong & PAGE_MASK;
- unsigned long end = (buffer_ulong + bytes) | ~PAGE_MASK;
- unsigned long nr_addrs = (end - start + 1) >> PAGE_SHIFT;
- unsigned long size = sizeof(*desc) +
- sizeof(desc->address[0]) * nr_addrs;
-
- /*
- * slab allocator returns at least sizeof(void*) aligned pointer.
- * When sizeof(*desc) > sizeof(void*), struct xencomm_desc might
- * cross page boundary.
- */
- if (sizeof(*desc) > sizeof(void *)) {
- unsigned long order = get_order(size);
- desc = (struct xencomm_desc *)__get_free_pages(gfp_mask,
- order);
- if (desc == NULL)
- return NULL;
-
- desc->nr_addrs =
- ((PAGE_SIZE << order) - sizeof(struct xencomm_desc)) /
- sizeof(*desc->address);
- } else {
- desc = kmalloc(size, gfp_mask);
- if (desc == NULL)
- return NULL;
-
- desc->nr_addrs = nr_addrs;
- }
- return desc;
-}
-
-void xencomm_free(struct xencomm_handle *desc)
-{
- if (desc && !((ulong)desc & XENCOMM_INLINE_FLAG)) {
- struct xencomm_desc *desc__ = (struct xencomm_desc *)desc;
- if (sizeof(*desc__) > sizeof(void *)) {
- unsigned long size = sizeof(*desc__) +
- sizeof(desc__->address[0]) * desc__->nr_addrs;
- unsigned long order = get_order(size);
- free_pages((unsigned long)__va(desc), order);
- } else
- kfree(__va(desc));
- }
-}
-
-static int xencomm_create(void *buffer, unsigned long bytes,
- struct xencomm_desc **ret, gfp_t gfp_mask)
-{
- struct xencomm_desc *desc;
- int rc;
-
- pr_debug("%s: %p[%ld]\n", __func__, buffer, bytes);
-
- if (bytes == 0) {
- /* don't create a descriptor; Xen recognizes NULL. */
- BUG_ON(buffer != NULL);
- *ret = NULL;
- return 0;
- }
-
- BUG_ON(buffer == NULL); /* 'bytes' is non-zero */
-
- desc = xencomm_alloc(gfp_mask, buffer, bytes);
- if (!desc) {
- printk(KERN_DEBUG "%s failure\n", "xencomm_alloc");
- return -ENOMEM;
- }
-
- rc = xencomm_init(desc, buffer, bytes);
- if (rc) {
- printk(KERN_DEBUG "%s failure: %d\n", "xencomm_init", rc);
- xencomm_free((struct xencomm_handle *)__pa(desc));
- return rc;
- }
-
- *ret = desc;
- return 0;
-}
-
-static struct xencomm_handle *xencomm_create_inline(void *ptr)
-{
- unsigned long paddr;
-
- BUG_ON(!xencomm_is_phys_contiguous((unsigned long)ptr));
-
- paddr = (unsigned long)xencomm_pa(ptr);
- BUG_ON(paddr & XENCOMM_INLINE_FLAG);
- return (struct xencomm_handle *)(paddr | XENCOMM_INLINE_FLAG);
-}
-
-/* "mini" routine, for stack-based communications: */
-static int xencomm_create_mini(void *buffer,
- unsigned long bytes, struct xencomm_mini *xc_desc,
- struct xencomm_desc **ret)
-{
- int rc = 0;
- struct xencomm_desc *desc;
- BUG_ON(((unsigned long)xc_desc) % sizeof(*xc_desc) != 0);
-
- desc = (void *)xc_desc;
-
- desc->nr_addrs = XENCOMM_MINI_ADDRS;
-
- rc = xencomm_init(desc, buffer, bytes);
- if (!rc)
- *ret = desc;
-
- return rc;
-}
-
-struct xencomm_handle *xencomm_map(void *ptr, unsigned long bytes)
-{
- int rc;
- struct xencomm_desc *desc;
-
- if (xencomm_is_phys_contiguous((unsigned long)ptr))
- return xencomm_create_inline(ptr);
-
- rc = xencomm_create(ptr, bytes, &desc, GFP_KERNEL);
-
- if (rc || desc == NULL)
- return NULL;
-
- return xencomm_pa(desc);
-}
-
-struct xencomm_handle *__xencomm_map_no_alloc(void *ptr, unsigned long bytes,
- struct xencomm_mini *xc_desc)
-{
- int rc;
- struct xencomm_desc *desc = NULL;
-
- if (xencomm_is_phys_contiguous((unsigned long)ptr))
- return xencomm_create_inline(ptr);
-
- rc = xencomm_create_mini(ptr, bytes, xc_desc,
- &desc);
-
- if (rc)
- return NULL;
-
- return xencomm_pa(desc);
-}