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s390 updates for the 5.16 merge window #2

Browse Source 
- Add PCI automatic error recovery.
 
 - Fix tape driver timer initialization broken during timers api cleanup.
 
 - Fix bogus CPU measurement counters values on CPUs offlining.
 
 - Check the validity of subchanel before reading other fields in
   the schib in cio code.
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Merge tag 's390-5.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull more s390 updates from Vasily Gorbik:

 - Add PCI automatic error recovery.

 - Fix tape driver timer initialization broken during timers api
   cleanup.

 - Fix bogus CPU measurement counters values on CPUs offlining.

 - Check the validity of subchanel before reading other fields in the
   schib in cio code.

* tag 's390-5.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/cio: check the subchannel validity for dev_busid
  s390/cpumf: cpum_cf PMU displays invalid value after hotplug remove
  s390/tape: fix timer initialization in tape_std_assign()
  s390/pci: implement minimal PCI error recovery
  PCI: Export pci_dev_lock()
  s390/pci: implement reset_slot for hotplug slot
  s390/pci: refresh function handle in iomap
This commit is contained in:
Linus Torvalds 2021-11-13 09:18:06 -08:00
commit be427a88a3
11 changed files with 417 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/s390/include/asm/pci.h
View File

@ -210,9 +210,11 @@ int zpci_deconfigure_device(struct zpci_dev *zdev);
void zpci_device_reserved(struct zpci_dev *zdev);
bool zpci_is_device_configured(struct zpci_dev *zdev);
int zpci_hot_reset_device(struct zpci_dev *zdev);
int zpci_register_ioat(struct zpci_dev *, u8, u64, u64, u64);
int zpci_unregister_ioat(struct zpci_dev *, u8);
void zpci_remove_reserved_devices(void);
void zpci_update_fh(struct zpci_dev *zdev, u32 fh);
/* CLP */
int clp_setup_writeback_mio(void);
@ -294,8 +296,10 @@ void zpci_debug_exit(void);
void zpci_debug_init_device(struct zpci_dev *, const char *);
void zpci_debug_exit_device(struct zpci_dev *);
/* Error reporting */
/* Error handling */
int zpci_report_error(struct pci_dev *, struct zpci_report_error_header *);
int zpci_clear_error_state(struct zpci_dev *zdev);
int zpci_reset_load_store_blocked(struct zpci_dev *zdev);
#ifdef CONFIG_NUMA

4
arch/s390/kernel/perf_cpum_cf.c
View File

@ -687,8 +687,10 @@ static void cpumf_pmu_stop(struct perf_event *event, int flags)
false);
if (cfdiag_diffctr(cpuhw, event->hw.config_base))
cfdiag_push_sample(event, cpuhw);
} else
} else if (cpuhw->flags & PMU_F_RESERVED) {
/* Only update when PMU not hotplugged off */
hw_perf_event_update(event);
}
hwc->state |= PERF_HES_UPTODATE;
}
}

148
arch/s390/pci/pci.c
View File

@ -481,6 +481,34 @@ static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
spin_unlock(&zpci_iomap_lock);
}
static void zpci_do_update_iomap_fh(struct zpci_dev *zdev, u32 fh)
{
int bar, idx;
spin_lock(&zpci_iomap_lock);
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
if (!zdev->bars[bar].size)
continue;
idx = zdev->bars[bar].map_idx;
if (!zpci_iomap_start[idx].count)
continue;
WRITE_ONCE(zpci_iomap_start[idx].fh, zdev->fh);
}
spin_unlock(&zpci_iomap_lock);
}
void zpci_update_fh(struct zpci_dev *zdev, u32 fh)
{
if (!fh || zdev->fh == fh)
return;
zdev->fh = fh;
if (zpci_use_mio(zdev))
return;
if (zdev->has_resources && zdev_enabled(zdev))
zpci_do_update_iomap_fh(zdev, fh);
}
static struct resource *__alloc_res(struct zpci_dev *zdev, unsigned long start,
unsigned long size, unsigned long flags)
{
@ -668,7 +696,7 @@ int zpci_enable_device(struct zpci_dev *zdev)
if (clp_enable_fh(zdev, &fh, ZPCI_NR_DMA_SPACES))
rc = -EIO;
else
zdev->fh = fh;
zpci_update_fh(zdev, fh);
return rc;
}
@ -679,14 +707,14 @@ int zpci_disable_device(struct zpci_dev *zdev)
cc = clp_disable_fh(zdev, &fh);
if (!cc) {
zdev->fh = fh;
zpci_update_fh(zdev, fh);
} else if (cc == CLP_RC_SETPCIFN_ALRDY) {
pr_info("Disabling PCI function %08x had no effect as it was already disabled\n",
zdev->fid);
/* Function is already disabled - update handle */
rc = clp_refresh_fh(zdev->fid, &fh);
if (!rc) {
zdev->fh = fh;
zpci_update_fh(zdev, fh);
rc = -EINVAL;
}
} else {
@ -695,6 +723,65 @@ int zpci_disable_device(struct zpci_dev *zdev)
return rc;
}
/**
* zpci_hot_reset_device - perform a reset of the given zPCI function
* @zdev: the slot which should be reset
*
* Performs a low level reset of the zPCI function. The reset is low level in
* the sense that the zPCI function can be reset without detaching it from the
* common PCI subsystem. The reset may be performed while under control of
* either DMA or IOMMU APIs in which case the existing DMA/IOMMU translation
* table is reinstated at the end of the reset.
*
* After the reset the functions internal state is reset to an initial state
* equivalent to its state during boot when first probing a driver.
* Consequently after reset the PCI function requires re-initialization via the
* common PCI code including re-enabling IRQs via pci_alloc_irq_vectors()
* and enabling the function via e.g.pci_enablde_device_flags().The caller
* must guard against concurrent reset attempts.
*
* In most cases this function should not be called directly but through
* pci_reset_function() or pci_reset_bus() which handle the save/restore and
* locking.
*
* Return: 0 on success and an error value otherwise
*/
int zpci_hot_reset_device(struct zpci_dev *zdev)
{
int rc;
zpci_dbg(3, "rst fid:%x, fh:%x\n", zdev->fid, zdev->fh);
if (zdev_enabled(zdev)) {
/* Disables device access, DMAs and IRQs (reset state) */
rc = zpci_disable_device(zdev);
/*
* Due to a z/VM vs LPAR inconsistency in the error state the
* FH may indicate an enabled device but disable says the
* device is already disabled don't treat it as an error here.
*/
if (rc == -EINVAL)
rc = 0;
if (rc)
return rc;
}
rc = zpci_enable_device(zdev);
if (rc)
return rc;
if (zdev->dma_table)
rc = zpci_register_ioat(zdev, 0, zdev->start_dma, zdev->end_dma,
(u64)zdev->dma_table);
else
rc = zpci_dma_init_device(zdev);
if (rc) {
zpci_disable_device(zdev);
return rc;
}
return 0;
}
/**
* zpci_create_device() - Create a new zpci_dev and add it to the zbus
* @fid: Function ID of the device to be created
@ -776,7 +863,7 @@ int zpci_scan_configured_device(struct zpci_dev *zdev, u32 fh)
{
int rc;
zdev->fh = fh;
zpci_update_fh(zdev, fh);
/* the PCI function will be scanned once function 0 appears */
if (!zdev->zbus->bus)
return 0;
@ -903,6 +990,59 @@ int zpci_report_error(struct pci_dev *pdev,
}
EXPORT_SYMBOL(zpci_report_error);
/**
* zpci_clear_error_state() - Clears the zPCI error state of the device
* @zdev: The zdev for which the zPCI error state should be reset
*
* Clear the zPCI error state of the device. If clearing the zPCI error state
* fails the device is left in the error state. In this case it may make sense
* to call zpci_io_perm_failure() on the associated pdev if it exists.
*
* Returns: 0 on success, -EIO otherwise
*/
int zpci_clear_error_state(struct zpci_dev *zdev)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_ERROR);
struct zpci_fib fib = {0};
u8 status;
int cc;
cc = zpci_mod_fc(req, &fib, &status);
if (cc) {
zpci_dbg(3, "ces fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
return -EIO;
}
return 0;
}
/**
* zpci_reset_load_store_blocked() - Re-enables L/S from error state
* @zdev: The zdev for which to unblock load/store access
*
* Re-enables load/store access for a PCI function in the error state while
* keeping DMA blocked. In this state drivers can poke MMIO space to determine
* if error recovery is possible while catching any rogue DMA access from the
* device.
*
* Returns: 0 on success, -EIO otherwise
*/
int zpci_reset_load_store_blocked(struct zpci_dev *zdev)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_RESET_BLOCK);
struct zpci_fib fib = {0};
u8 status;
int cc;
cc = zpci_mod_fc(req, &fib, &status);
if (cc) {
zpci_dbg(3, "rls fid:%x, cc:%d, status:%x\n", zdev->fid, cc, status);
return -EIO;
}
return 0;
}
static int zpci_mem_init(void)
{
BUILD_BUG_ON(!is_power_of_2(__alignof__(struct zpci_fmb)) ||

230
arch/s390/pci/pci_event.c
View File

@ -47,18 +47,223 @@ struct zpci_ccdf_avail {
u16 pec; /* PCI event code */
} __packed;
static inline bool ers_result_indicates_abort(pci_ers_result_t ers_res)
{
switch (ers_res) {
case PCI_ERS_RESULT_CAN_RECOVER:
case PCI_ERS_RESULT_RECOVERED:
case PCI_ERS_RESULT_NEED_RESET:
return false;
default:
return true;
}
}
static bool is_passed_through(struct zpci_dev *zdev)
{
return zdev->s390_domain;
}
static bool is_driver_supported(struct pci_driver *driver)
{
if (!driver || !driver->err_handler)
return false;
if (!driver->err_handler->error_detected)
return false;
if (!driver->err_handler->slot_reset)
return false;
if (!driver->err_handler->resume)
return false;
return true;
}
static pci_ers_result_t zpci_event_notify_error_detected(struct pci_dev *pdev,
struct pci_driver *driver)
{
pci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;
ers_res = driver->err_handler->error_detected(pdev, pdev->error_state);
if (ers_result_indicates_abort(ers_res))
pr_info("%s: Automatic recovery failed after initial reporting\n", pci_name(pdev));
else if (ers_res == PCI_ERS_RESULT_NEED_RESET)
pr_debug("%s: Driver needs reset to recover\n", pci_name(pdev));
return ers_res;
}
static pci_ers_result_t zpci_event_do_error_state_clear(struct pci_dev *pdev,
struct pci_driver *driver)
{
pci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;
struct zpci_dev *zdev = to_zpci(pdev);
int rc;
pr_info("%s: Unblocking device access for examination\n", pci_name(pdev));
rc = zpci_reset_load_store_blocked(zdev);
if (rc) {
pr_err("%s: Unblocking device access failed\n", pci_name(pdev));
/* Let's try a full reset instead */
return PCI_ERS_RESULT_NEED_RESET;
}
if (driver->err_handler->mmio_enabled) {
ers_res = driver->err_handler->mmio_enabled(pdev);
if (ers_result_indicates_abort(ers_res)) {
pr_info("%s: Automatic recovery failed after MMIO re-enable\n",
pci_name(pdev));
return ers_res;
} else if (ers_res == PCI_ERS_RESULT_NEED_RESET) {
pr_debug("%s: Driver needs reset to recover\n", pci_name(pdev));
return ers_res;
}
}
pr_debug("%s: Unblocking DMA\n", pci_name(pdev));
rc = zpci_clear_error_state(zdev);
if (!rc) {
pdev->error_state = pci_channel_io_normal;
} else {
pr_err("%s: Unblocking DMA failed\n", pci_name(pdev));
/* Let's try a full reset instead */
return PCI_ERS_RESULT_NEED_RESET;
}
return ers_res;
}
static pci_ers_result_t zpci_event_do_reset(struct pci_dev *pdev,
struct pci_driver *driver)
{
pci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;
pr_info("%s: Initiating reset\n", pci_name(pdev));
if (zpci_hot_reset_device(to_zpci(pdev))) {
pr_err("%s: The reset request failed\n", pci_name(pdev));
return ers_res;
}
pdev->error_state = pci_channel_io_normal;
ers_res = driver->err_handler->slot_reset(pdev);
if (ers_result_indicates_abort(ers_res)) {
pr_info("%s: Automatic recovery failed after slot reset\n", pci_name(pdev));
return ers_res;
}
return ers_res;
}
/* zpci_event_attempt_error_recovery - Try to recover the given PCI function
* @pdev: PCI function to recover currently in the error state
*
* We follow the scheme outlined in Documentation/PCI/pci-error-recovery.rst.
* With the simplification that recovery always happens per function
* and the platform determines which functions are affected for
* multi-function devices.
*/
static pci_ers_result_t zpci_event_attempt_error_recovery(struct pci_dev *pdev)
{
pci_ers_result_t ers_res = PCI_ERS_RESULT_DISCONNECT;
struct pci_driver *driver;
/*
* Ensure that the PCI function is not removed concurrently, no driver
* is unbound or probed and that userspace can't access its
* configuration space while we perform recovery.
*/
pci_dev_lock(pdev);
if (pdev->error_state == pci_channel_io_perm_failure) {
ers_res = PCI_ERS_RESULT_DISCONNECT;
goto out_unlock;
}
pdev->error_state = pci_channel_io_frozen;
if (is_passed_through(to_zpci(pdev))) {
pr_info("%s: Cannot be recovered in the host because it is a pass-through device\n",
pci_name(pdev));
goto out_unlock;
}
driver = to_pci_driver(pdev->dev.driver);
if (!is_driver_supported(driver)) {
if (!driver)
pr_info("%s: Cannot be recovered because no driver is bound to the device\n",
pci_name(pdev));
else
pr_info("%s: The %s driver bound to the device does not support error recovery\n",
pci_name(pdev),
driver->name);
goto out_unlock;
}
ers_res = zpci_event_notify_error_detected(pdev, driver);
if (ers_result_indicates_abort(ers_res))
goto out_unlock;
if (ers_res == PCI_ERS_RESULT_CAN_RECOVER) {
ers_res = zpci_event_do_error_state_clear(pdev, driver);
if (ers_result_indicates_abort(ers_res))
goto out_unlock;
}
if (ers_res == PCI_ERS_RESULT_NEED_RESET)
ers_res = zpci_event_do_reset(pdev, driver);
if (ers_res != PCI_ERS_RESULT_RECOVERED) {
pr_err("%s: Automatic recovery failed; operator intervention is required\n",
pci_name(pdev));
goto out_unlock;
}
pr_info("%s: The device is ready to resume operations\n", pci_name(pdev));
if (driver->err_handler->resume)
driver->err_handler->resume(pdev);
out_unlock:
pci_dev_unlock(pdev);
return ers_res;
}
/* zpci_event_io_failure - Report PCI channel failure state to driver
* @pdev: PCI function for which to report
* @es: PCI channel failure state to report
*/
static void zpci_event_io_failure(struct pci_dev *pdev, pci_channel_state_t es)
{
struct pci_driver *driver;
pci_dev_lock(pdev);
pdev->error_state = es;
/**
* While vfio-pci's error_detected callback notifies user-space QEMU
* reacts to this by freezing the guest. In an s390 environment PCI
* errors are rarely fatal so this is overkill. Instead in the future
* we will inject the error event and let the guest recover the device
* itself.
*/
if (is_passed_through(to_zpci(pdev)))
goto out;
driver = to_pci_driver(pdev->dev.driver);
if (driver && driver->err_handler && driver->err_handler->error_detected)
driver->err_handler->error_detected(pdev, pdev->error_state);
out:
pci_dev_unlock(pdev);
}
static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
{
struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
struct pci_dev *pdev = NULL;
pci_ers_result_t ers_res;
zpci_dbg(3, "err fid:%x, fh:%x, pec:%x\n",
ccdf->fid, ccdf->fh, ccdf->pec);
zpci_err("error CCDF:\n");
zpci_err_hex(ccdf, sizeof(*ccdf));
if (zdev)
pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
if (zdev) {
zpci_update_fh(zdev, ccdf->fh);
if (zdev->zbus->bus)
pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn);
}
pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
@ -66,7 +271,20 @@ static void __zpci_event_error(struct zpci_ccdf_err *ccdf)
if (!pdev)
return;
pdev->error_state = pci_channel_io_perm_failure;
switch (ccdf->pec) {
case 0x003a: /* Service Action or Error Recovery Successful */
ers_res = zpci_event_attempt_error_recovery(pdev);
if (ers_res != PCI_ERS_RESULT_RECOVERED)
zpci_event_io_failure(pdev, pci_channel_io_perm_failure);
break;
default:
/*
* Mark as frozen not permanently failed because the device
* could be subsequently recovered by the platform.
*/
zpci_event_io_failure(pdev, pci_channel_io_frozen);
break;
}
pci_dev_put(pdev);
}
@ -78,7 +296,7 @@ void zpci_event_error(void *data)
static void zpci_event_hard_deconfigured(struct zpci_dev *zdev, u32 fh)
{
zdev->fh = fh;
zpci_update_fh(zdev, fh);
/* Give the driver a hint that the function is
* already unusable.
*/
@ -121,7 +339,7 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
if (!zdev)
zpci_create_device(ccdf->fid, ccdf->fh, ZPCI_FN_STATE_STANDBY);
else
zdev->fh = ccdf->fh;
zpci_update_fh(zdev, ccdf->fh);
break;
case 0x0303: /* Deconfiguration requested */
if (zdev) {
@ -130,7 +348,7 @@ static void __zpci_event_availability(struct zpci_ccdf_avail *ccdf)
*/
if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
break;
zdev->fh = ccdf->fh;
zpci_update_fh(zdev, ccdf->fh);
zpci_deconfigure_device(zdev);
}
break;

4
arch/s390/pci/pci_insn.c
View File

@ -163,7 +163,7 @@ static inline int zpci_load_fh(u64 *data, const volatile void __iomem *addr,
unsigned long len)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];
u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, len);
u64 req = ZPCI_CREATE_REQ(READ_ONCE(entry->fh), entry->bar, len);
return __zpci_load(data, req, ZPCI_OFFSET(addr));
}
@ -244,7 +244,7 @@ static inline int zpci_store_fh(const volatile void __iomem *addr, u64 data,
unsigned long len)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)];
u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, len);
u64 req = ZPCI_CREATE_REQ(READ_ONCE(entry->fh), entry->bar, len);
return __zpci_store(data, req, ZPCI_OFFSET(addr));
}

9
arch/s390/pci/pci_irq.c
View File

@ -387,6 +387,15 @@ void arch_teardown_msi_irqs(struct pci_dev *pdev)
airq_iv_free(zpci_ibv[0], zdev->msi_first_bit, zdev->msi_nr_irqs);
}
void arch_restore_msi_irqs(struct pci_dev *pdev)
{
struct zpci_dev *zdev = to_zpci(pdev);
if (!zdev->irqs_registered)
zpci_set_irq(zdev);
default_restore_msi_irqs(pdev);
}
static struct airq_struct zpci_airq = {
.handler = zpci_floating_irq_handler,
.isc = PCI_ISC,

24
drivers/pci/hotplug/s390_pci_hpc.c
View File

@ -57,6 +57,29 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
return zpci_deconfigure_device(zdev);
}
static int reset_slot(struct hotplug_slot *hotplug_slot, bool probe)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
hotplug_slot);
if (zdev->state != ZPCI_FN_STATE_CONFIGURED)
return -EIO;
/*
* We can't take the zdev->lock as reset_slot may be called during
* probing and/or device removal which already happens under the
* zdev->lock. Instead the user should use the higher level
* pci_reset_function() or pci_bus_reset() which hold the PCI device
* lock preventing concurrent removal. If not using these functions
* holding the PCI device lock is required.
*/
/* As long as the function is configured we can reset */
if (probe)
return 0;
return zpci_hot_reset_device(zdev);
}
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct zpci_dev *zdev = container_of(hotplug_slot, struct zpci_dev,
@ -76,6 +99,7 @@ static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
static const struct hotplug_slot_ops s390_hotplug_slot_ops = {
.enable_slot = enable_slot,
.disable_slot = disable_slot,
.reset_slot = reset_slot,
.get_power_status = get_power_status,
.get_adapter_status = get_adapter_status,
};

3
drivers/pci/pci.c
View File

@ -5106,12 +5106,13 @@ static int pci_reset_bus_function(struct pci_dev *dev, bool probe)
return pci_parent_bus_reset(dev, probe);
}
static void pci_dev_lock(struct pci_dev *dev)
void pci_dev_lock(struct pci_dev *dev)
{
pci_cfg_access_lock(dev);
/* block PM suspend, driver probe, etc. */
device_lock(&dev->dev);
}
EXPORT_SYMBOL_GPL(pci_dev_lock);
/* Return 1 on successful lock, 0 on contention */
int pci_dev_trylock(struct pci_dev *dev)

3
drivers/s390/char/tape_std.c
View File

@ -53,7 +53,6 @@ int
tape_std_assign(struct tape_device *device)
{
int rc;
struct timer_list timeout;
struct tape_request *request;
request = tape_alloc_request(2, 11);
@ -70,7 +69,7 @@ tape_std_assign(struct tape_device *device)
* So we set up a timeout for this call.
*/
timer_setup(&request->timer, tape_std_assign_timeout, 0);
mod_timer(&timeout, jiffies + 2 * HZ);
mod_timer(&request->timer, jiffies + msecs_to_jiffies(2000));
rc = tape_do_io_interruptible(device, request);

4
drivers/s390/cio/css.c
View File

@ -437,8 +437,8 @@ static ssize_t dev_busid_show(struct device *dev,
struct subchannel *sch = to_subchannel(dev);
struct pmcw *pmcw = &sch->schib.pmcw;
if ((pmcw->st == SUBCHANNEL_TYPE_IO ||
pmcw->st == SUBCHANNEL_TYPE_MSG) && pmcw->dnv)
if ((pmcw->st == SUBCHANNEL_TYPE_IO && pmcw->dnv) ||
(pmcw->st == SUBCHANNEL_TYPE_MSG && pmcw->w))
return sysfs_emit(buf, "0.%x.%04x\n", sch->schid.ssid,
pmcw->dev);
else

1
include/linux/pci.h
View File

@ -1666,6 +1666,7 @@ void pci_cfg_access_lock(struct pci_dev *dev);
bool pci_cfg_access_trylock(struct pci_dev *dev);
void pci_cfg_access_unlock(struct pci_dev *dev);
void pci_dev_lock(struct pci_dev *dev);
int pci_dev_trylock(struct pci_dev *dev);
void pci_dev_unlock(struct pci_dev *dev);