1
0
mirror of https://github.com/torvalds/linux.git synced 2024-12-15 23:51:46 +00:00
linux/drivers/xen/arm-device.c
Kees Cook 6396bb2215 treewide: kzalloc() -> kcalloc()
The kzalloc() function has a 2-factor argument form, kcalloc(). This
patch replaces cases of:

        kzalloc(a * b, gfp)

with:
        kcalloc(a * b, gfp)

as well as handling cases of:

        kzalloc(a * b * c, gfp)

with:

        kzalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kzalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kzalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kzalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kzalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kzalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kzalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kzalloc
+ kcalloc
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kzalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kzalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kzalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kzalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kzalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kzalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kzalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kzalloc(sizeof(THING) * C2, ...)
|
  kzalloc(sizeof(TYPE) * C2, ...)
|
  kzalloc(C1 * C2 * C3, ...)
|
  kzalloc(C1 * C2, ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kzalloc
+ kcalloc
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

199 lines
4.8 KiB
C

/*
* Copyright (c) 2015, Linaro Limited, Shannon Zhao
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <xen/interface/memory.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
static int xen_unmap_device_mmio(const struct resource *resources,
unsigned int count)
{
unsigned int i, j, nr;
int rc = 0;
const struct resource *r;
struct xen_remove_from_physmap xrp;
for (i = 0; i < count; i++) {
r = &resources[i];
nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
continue;
for (j = 0; j < nr; j++) {
xrp.domid = DOMID_SELF;
xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
&xrp);
if (rc)
return rc;
}
}
return rc;
}
static int xen_map_device_mmio(const struct resource *resources,
unsigned int count)
{
unsigned int i, j, nr;
int rc = 0;
const struct resource *r;
xen_pfn_t *gpfns;
xen_ulong_t *idxs;
int *errs;
for (i = 0; i < count; i++) {
struct xen_add_to_physmap_range xatp = {
.domid = DOMID_SELF,
.space = XENMAPSPACE_dev_mmio
};
r = &resources[i];
nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
continue;
gpfns = kcalloc(nr, sizeof(xen_pfn_t), GFP_KERNEL);
idxs = kcalloc(nr, sizeof(xen_ulong_t), GFP_KERNEL);
errs = kcalloc(nr, sizeof(int), GFP_KERNEL);
if (!gpfns || !idxs || !errs) {
kfree(gpfns);
kfree(idxs);
kfree(errs);
rc = -ENOMEM;
goto unmap;
}
for (j = 0; j < nr; j++) {
/*
* The regions are always mapped 1:1 to DOM0 and this is
* fine because the memory map for DOM0 is the same as
* the host (except for the RAM).
*/
gpfns[j] = XEN_PFN_DOWN(r->start) + j;
idxs[j] = XEN_PFN_DOWN(r->start) + j;
}
xatp.size = nr;
set_xen_guest_handle(xatp.gpfns, gpfns);
set_xen_guest_handle(xatp.idxs, idxs);
set_xen_guest_handle(xatp.errs, errs);
rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
kfree(gpfns);
kfree(idxs);
kfree(errs);
if (rc)
goto unmap;
}
return rc;
unmap:
xen_unmap_device_mmio(resources, i);
return rc;
}
static int xen_platform_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct platform_device *pdev = to_platform_device(data);
int r = 0;
if (pdev->num_resources == 0 || pdev->resource == NULL)
return NOTIFY_OK;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
break;
case BUS_NOTIFY_DEL_DEVICE:
r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
break;
default:
return NOTIFY_DONE;
}
if (r)
dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
action == BUS_NOTIFY_ADD_DEVICE ? "map" :
(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
pdev->name);
return NOTIFY_OK;
}
static struct notifier_block platform_device_nb = {
.notifier_call = xen_platform_notifier,
};
static int __init register_xen_platform_notifier(void)
{
if (!xen_initial_domain() || acpi_disabled)
return 0;
return bus_register_notifier(&platform_bus_type, &platform_device_nb);
}
arch_initcall(register_xen_platform_notifier);
#ifdef CONFIG_ARM_AMBA
#include <linux/amba/bus.h>
static int xen_amba_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct amba_device *adev = to_amba_device(data);
int r = 0;
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
r = xen_map_device_mmio(&adev->res, 1);
break;
case BUS_NOTIFY_DEL_DEVICE:
r = xen_unmap_device_mmio(&adev->res, 1);
break;
default:
return NOTIFY_DONE;
}
if (r)
dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
action == BUS_NOTIFY_ADD_DEVICE ? "map" :
(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
adev->dev.init_name);
return NOTIFY_OK;
}
static struct notifier_block amba_device_nb = {
.notifier_call = xen_amba_notifier,
};
static int __init register_xen_amba_notifier(void)
{
if (!xen_initial_domain() || acpi_disabled)
return 0;
return bus_register_notifier(&amba_bustype, &amba_device_nb);
}
arch_initcall(register_xen_amba_notifier);
#endif