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GenWQE: Add sysfs interface for bitstream reload

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This patch adds an interface on sysfs for userspace to request a card
bitstream reload. It sets the appropriate register and try to perform a
fundamental reset on the PCIe slot for the card to reload the bitstream
from the chosen partition.

Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
Acked-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kleber Sacilotto de Souza
2014-06-04 10:57:50 -03:00
committed by Greg Kroah-Hartman
parent fc51768ba2
commit c1f732ad76
4 changed files with 125 additions and 0 deletions
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90
drivers/misc/genwqe/card_base.c
View File

@@ -760,6 +760,89 @@ static u64 genwqe_fir_checking(struct genwqe_dev *cd)
return IO_ILLEGAL_VALUE;
}
/**
* genwqe_pci_fundamental_reset() - trigger a PCIe fundamental reset on the slot
*
* Note: pci_set_pcie_reset_state() is not implemented on all archs, so this
* reset method will not work in all cases.
*
* Return: 0 on success or error code from pci_set_pcie_reset_state()
*/
static int genwqe_pci_fundamental_reset(struct pci_dev *pci_dev)
{
int rc;
/*
* lock pci config space access from userspace,
* save state and issue PCIe fundamental reset
*/
pci_cfg_access_lock(pci_dev);
pci_save_state(pci_dev);
rc = pci_set_pcie_reset_state(pci_dev, pcie_warm_reset);
if (!rc) {
/* keep PCIe reset asserted for 250ms */
msleep(250);
pci_set_pcie_reset_state(pci_dev, pcie_deassert_reset);
/* Wait for 2s to reload flash and train the link */
msleep(2000);
}
pci_restore_state(pci_dev);
pci_cfg_access_unlock(pci_dev);
return rc;
}
/*
* genwqe_reload_bistream() - reload card bitstream
*
* Set the appropriate register and call fundamental reset to reaload the card
* bitstream.
*
* Return: 0 on success, error code otherwise
*/
static int genwqe_reload_bistream(struct genwqe_dev *cd)
{
struct pci_dev *pci_dev = cd->pci_dev;
int rc;
dev_info(&pci_dev->dev,
"[%s] resetting card for bitstream reload\n",
__func__);
genwqe_stop(cd);
/*
* Cause a CPLD reprogram with the 'next_bitstream'
* partition on PCIe hot or fundamental reset
*/
__genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET,
(cd->softreset & 0xcull) | 0x70ull);
rc = genwqe_pci_fundamental_reset(pci_dev);
if (rc) {
/*
* A fundamental reset failure can be caused
* by lack of support on the arch, so we just
* log the error and try to start the card
* again.
*/
dev_err(&pci_dev->dev,
"[%s] err: failed to reset card for bitstream reload\n",
__func__);
}
rc = genwqe_start(cd);
if (rc) {
dev_err(&pci_dev->dev,
"[%s] err: cannot start card services! (err=%d)\n",
__func__, rc);
return rc;
}
dev_info(&pci_dev->dev,
"[%s] card reloaded\n", __func__);
return 0;
}
/**
* genwqe_health_thread() - Health checking thread
*
@@ -846,6 +929,13 @@ static int genwqe_health_thread(void *data)
}
}
if (cd->card_state == GENWQE_CARD_RELOAD_BITSTREAM) {
/* Userspace requested card bitstream reload */
rc = genwqe_reload_bistream(cd);
if (rc)
goto fatal_error;
}
cd->last_gfir = gfir;
cond_resched();
}