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linux_dsm_epyc7002/drivers/xen/xen-pciback/pciback_ops.c
Kees Cook 6da2ec5605 treewide: kmalloc() -> kmalloc_array() 
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:

        kmalloc(a * b, gfp)

with:
        kmalloc_array(a * b, gfp)

as well as handling cases of:

        kmalloc(a * b * c, gfp)

with:

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

as it's slightly less ugly than:

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

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

        kmalloc(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 tools/ directory was manually excluded, since it has its own
implementation of kmalloc().

The Coccinelle script used for this was:

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

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

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

(
  kmalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	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;
@@

(
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

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

- kmalloc
+ kmalloc_array
  (
-	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;
@@

(
  kmalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	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;
@@

(
  kmalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	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;
@@

(
  kmalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	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;
@@

(
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	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;
@@

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

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

439 lines
12 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* PCI Backend Operations - respond to PCI requests from Frontend
*
* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/moduleparam.h>
#include <linux/wait.h>
#include <linux/bitops.h>
#include <xen/events.h>
#include <linux/sched.h>
#include "pciback.h"
int verbose_request;
module_param(verbose_request, int, 0644);
static irqreturn_t xen_pcibk_guest_interrupt(int irq, void *dev_id);
/* Ensure a device is has the fake IRQ handler "turned on/off" and is
* ready to be exported. This MUST be run after xen_pcibk_reset_device
* which does the actual PCI device enable/disable.
*/
static void xen_pcibk_control_isr(struct pci_dev *dev, int reset)
{
struct xen_pcibk_dev_data *dev_data;
int rc;
int enable = 0;
dev_data = pci_get_drvdata(dev);
if (!dev_data)
return;
/* We don't deal with bridges */
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
return;
if (reset) {
dev_data->enable_intx = 0;
dev_data->ack_intr = 0;
}
enable = dev_data->enable_intx;
/* Asked to disable, but ISR isn't runnig */
if (!enable && !dev_data->isr_on)
return;
/* Squirrel away the IRQs in the dev_data. We need this
* b/c when device transitions to MSI, the dev->irq is
* overwritten with the MSI vector.
*/
if (enable)
dev_data->irq = dev->irq;
/*
* SR-IOV devices in all use MSI-X and have no legacy
* interrupts, so inhibit creating a fake IRQ handler for them.
*/
if (dev_data->irq == 0)
goto out;
dev_dbg(&dev->dev, "%s: #%d %s %s%s %s-> %s\n",
dev_data->irq_name,
dev_data->irq,
pci_is_enabled(dev) ? "on" : "off",
dev->msi_enabled ? "MSI" : "",
dev->msix_enabled ? "MSI/X" : "",
dev_data->isr_on ? "enable" : "disable",
enable ? "enable" : "disable");
if (enable) {
/*
* The MSI or MSI-X should not have an IRQ handler. Otherwise
* if the guest terminates we BUG_ON in free_msi_irqs.
*/
if (dev->msi_enabled || dev->msix_enabled)
goto out;
rc = request_irq(dev_data->irq,
xen_pcibk_guest_interrupt, IRQF_SHARED,
dev_data->irq_name, dev);
if (rc) {
dev_err(&dev->dev, "%s: failed to install fake IRQ " \
"handler for IRQ %d! (rc:%d)\n",
dev_data->irq_name, dev_data->irq, rc);
goto out;
}
} else {
free_irq(dev_data->irq, dev);
dev_data->irq = 0;
}
dev_data->isr_on = enable;
dev_data->ack_intr = enable;
out:
dev_dbg(&dev->dev, "%s: #%d %s %s%s %s\n",
dev_data->irq_name,
dev_data->irq,
pci_is_enabled(dev) ? "on" : "off",
dev->msi_enabled ? "MSI" : "",
dev->msix_enabled ? "MSI/X" : "",
enable ? (dev_data->isr_on ? "enabled" : "failed to enable") :
(dev_data->isr_on ? "failed to disable" : "disabled"));
}
/* Ensure a device is "turned off" and ready to be exported.
* (Also see xen_pcibk_config_reset to ensure virtual configuration space is
* ready to be re-exported)
*/
void xen_pcibk_reset_device(struct pci_dev *dev)
{
u16 cmd;
xen_pcibk_control_isr(dev, 1 /* reset device */);
/* Disable devices (but not bridges) */
if (dev->hdr_type == PCI_HEADER_TYPE_NORMAL) {
#ifdef CONFIG_PCI_MSI
/* The guest could have been abruptly killed without
* disabling MSI/MSI-X interrupts.*/
if (dev->msix_enabled)
pci_disable_msix(dev);
if (dev->msi_enabled)
pci_disable_msi(dev);
#endif
if (pci_is_enabled(dev))
pci_disable_device(dev);
pci_write_config_word(dev, PCI_COMMAND, 0);
dev->is_busmaster = 0;
} else {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (cmd & (PCI_COMMAND_INVALIDATE)) {
cmd &= ~(PCI_COMMAND_INVALIDATE);
pci_write_config_word(dev, PCI_COMMAND, cmd);
dev->is_busmaster = 0;
}
}
}
#ifdef CONFIG_PCI_MSI
static
int xen_pcibk_enable_msi(struct xen_pcibk_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op)
{
struct xen_pcibk_dev_data *dev_data;
int status;
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: enable MSI\n", pci_name(dev));
if (dev->msi_enabled)
status = -EALREADY;
else if (dev->msix_enabled)
status = -ENXIO;
else
status = pci_enable_msi(dev);
if (status) {
pr_warn_ratelimited("%s: error enabling MSI for guest %u: err %d\n",
pci_name(dev), pdev->xdev->otherend_id,
status);
op->value = 0;
return XEN_PCI_ERR_op_failed;
}
/* The value the guest needs is actually the IDT vector, not the
* the local domain's IRQ number. */
op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: MSI: %d\n", pci_name(dev),
op->value);
dev_data = pci_get_drvdata(dev);
if (dev_data)
dev_data->ack_intr = 0;
return 0;
}
static
int xen_pcibk_disable_msi(struct xen_pcibk_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op)
{
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: disable MSI\n",
pci_name(dev));
if (dev->msi_enabled) {
struct xen_pcibk_dev_data *dev_data;
pci_disable_msi(dev);
dev_data = pci_get_drvdata(dev);
if (dev_data)
dev_data->ack_intr = 1;
}
op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: MSI: %d\n", pci_name(dev),
op->value);
return 0;
}
static
int xen_pcibk_enable_msix(struct xen_pcibk_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op)
{
struct xen_pcibk_dev_data *dev_data;
int i, result;
struct msix_entry *entries;
u16 cmd;
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: enable MSI-X\n",
pci_name(dev));
if (op->value > SH_INFO_MAX_VEC)
return -EINVAL;
if (dev->msix_enabled)
return -EALREADY;
/*
* PCI_COMMAND_MEMORY must be enabled, otherwise we may not be able
* to access the BARs where the MSI-X entries reside.
* But VF devices are unique in which the PF needs to be checked.
*/
pci_read_config_word(pci_physfn(dev), PCI_COMMAND, &cmd);
if (dev->msi_enabled || !(cmd & PCI_COMMAND_MEMORY))
return -ENXIO;
entries = kmalloc_array(op->value, sizeof(*entries), GFP_KERNEL);
if (entries == NULL)
return -ENOMEM;
for (i = 0; i < op->value; i++) {
entries[i].entry = op->msix_entries[i].entry;
entries[i].vector = op->msix_entries[i].vector;
}
result = pci_enable_msix_exact(dev, entries, op->value);
if (result == 0) {
for (i = 0; i < op->value; i++) {
op->msix_entries[i].entry = entries[i].entry;
if (entries[i].vector) {
op->msix_entries[i].vector =
xen_pirq_from_irq(entries[i].vector);
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: " \
"MSI-X[%d]: %d\n",
pci_name(dev), i,
op->msix_entries[i].vector);
}
}
} else
pr_warn_ratelimited("%s: error enabling MSI-X for guest %u: err %d!\n",
pci_name(dev), pdev->xdev->otherend_id,
result);
kfree(entries);
op->value = result;
dev_data = pci_get_drvdata(dev);
if (dev_data)
dev_data->ack_intr = 0;
return result > 0 ? 0 : result;
}
static
int xen_pcibk_disable_msix(struct xen_pcibk_device *pdev,
struct pci_dev *dev, struct xen_pci_op *op)
{
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: disable MSI-X\n",
pci_name(dev));
if (dev->msix_enabled) {
struct xen_pcibk_dev_data *dev_data;
pci_disable_msix(dev);
dev_data = pci_get_drvdata(dev);
if (dev_data)
dev_data->ack_intr = 1;
}
/*
* SR-IOV devices (which don't have any legacy IRQ) have
* an undefined IRQ value of zero.
*/
op->value = dev->irq ? xen_pirq_from_irq(dev->irq) : 0;
if (unlikely(verbose_request))
printk(KERN_DEBUG DRV_NAME ": %s: MSI-X: %d\n",
pci_name(dev), op->value);
return 0;
}
#endif
/*
* Now the same evtchn is used for both pcifront conf_read_write request
* as well as pcie aer front end ack. We use a new work_queue to schedule
* xen_pcibk conf_read_write service for avoiding confict with aer_core
* do_recovery job which also use the system default work_queue
*/
void xen_pcibk_test_and_schedule_op(struct xen_pcibk_device *pdev)
{
/* Check that frontend is requesting an operation and that we are not
* already processing a request */
if (test_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags)
&& !test_and_set_bit(_PDEVF_op_active, &pdev->flags)) {
schedule_work(&pdev->op_work);
}
/*_XEN_PCIB_active should have been cleared by pcifront. And also make
sure xen_pcibk is waiting for ack by checking _PCIB_op_pending*/
if (!test_bit(_XEN_PCIB_active, (unsigned long *)&pdev->sh_info->flags)
&& test_bit(_PCIB_op_pending, &pdev->flags)) {
wake_up(&xen_pcibk_aer_wait_queue);
}
}
/* Performing the configuration space reads/writes must not be done in atomic
* context because some of the pci_* functions can sleep (mostly due to ACPI
* use of semaphores). This function is intended to be called from a work
* queue in process context taking a struct xen_pcibk_device as a parameter */
void xen_pcibk_do_op(struct work_struct *data)
{
struct xen_pcibk_device *pdev =
container_of(data, struct xen_pcibk_device, op_work);
struct pci_dev *dev;
struct xen_pcibk_dev_data *dev_data = NULL;
struct xen_pci_op *op = &pdev->op;
int test_intx = 0;
#ifdef CONFIG_PCI_MSI
unsigned int nr = 0;
#endif
*op = pdev->sh_info->op;
barrier();
dev = xen_pcibk_get_pci_dev(pdev, op->domain, op->bus, op->devfn);
if (dev == NULL)
op->err = XEN_PCI_ERR_dev_not_found;
else {
dev_data = pci_get_drvdata(dev);
if (dev_data)
test_intx = dev_data->enable_intx;
switch (op->cmd) {
case XEN_PCI_OP_conf_read:
op->err = xen_pcibk_config_read(dev,
op->offset, op->size, &op->value);
break;
case XEN_PCI_OP_conf_write:
op->err = xen_pcibk_config_write(dev,
op->offset, op->size, op->value);
break;
#ifdef CONFIG_PCI_MSI
case XEN_PCI_OP_enable_msi:
op->err = xen_pcibk_enable_msi(pdev, dev, op);
break;
case XEN_PCI_OP_disable_msi:
op->err = xen_pcibk_disable_msi(pdev, dev, op);
break;
case XEN_PCI_OP_enable_msix:
nr = op->value;
op->err = xen_pcibk_enable_msix(pdev, dev, op);
break;
case XEN_PCI_OP_disable_msix:
op->err = xen_pcibk_disable_msix(pdev, dev, op);
break;
#endif
default:
op->err = XEN_PCI_ERR_not_implemented;
break;
}
}
if (!op->err && dev && dev_data) {
/* Transition detected */
if ((dev_data->enable_intx != test_intx))
xen_pcibk_control_isr(dev, 0 /* no reset */);
}
pdev->sh_info->op.err = op->err;
pdev->sh_info->op.value = op->value;
#ifdef CONFIG_PCI_MSI
if (op->cmd == XEN_PCI_OP_enable_msix && op->err == 0) {
unsigned int i;
for (i = 0; i < nr; i++)
pdev->sh_info->op.msix_entries[i].vector =
op->msix_entries[i].vector;
}
#endif
/* Tell the driver domain that we're done. */
wmb();
clear_bit(_XEN_PCIF_active, (unsigned long *)&pdev->sh_info->flags);
notify_remote_via_irq(pdev->evtchn_irq);
/* Mark that we're done. */
smp_mb__before_atomic(); /* /after/ clearing PCIF_active */
clear_bit(_PDEVF_op_active, &pdev->flags);
smp_mb__after_atomic(); /* /before/ final check for work */
/* Check to see if the driver domain tried to start another request in
* between clearing _XEN_PCIF_active and clearing _PDEVF_op_active.
*/
xen_pcibk_test_and_schedule_op(pdev);
}
irqreturn_t xen_pcibk_handle_event(int irq, void *dev_id)
{
struct xen_pcibk_device *pdev = dev_id;
xen_pcibk_test_and_schedule_op(pdev);
return IRQ_HANDLED;
}
static irqreturn_t xen_pcibk_guest_interrupt(int irq, void *dev_id)
{
struct pci_dev *dev = (struct pci_dev *)dev_id;
struct xen_pcibk_dev_data *dev_data = pci_get_drvdata(dev);
if (dev_data->isr_on && dev_data->ack_intr) {
dev_data->handled++;
if ((dev_data->handled % 1000) == 0) {
if (xen_test_irq_shared(irq)) {
pr_info("%s IRQ line is not shared "
"with other domains. Turning ISR off\n",
dev_data->irq_name);
dev_data->ack_intr = 0;
}
}
return IRQ_HANDLED;
}
return IRQ_NONE;
}
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