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| author | Qiuxu Zhuo <qiuxu.zhuo@intel.com> | 2017-08-14 23:48:45 +0800 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2017-08-19 10:47:24 +0200 |
| commit | 5fd77cb3bac77f690d1d9cf57dc7851fcb3e7945 (patch) | |
| tree | 269ceff2bff83778940cf2f4750798530b624688 /drivers/edac/pnd2_edac.c | |
| parent | d84676a9e12817c8435e836911800bdcc67928a0 (diff) | |
| download | lwn-5fd77cb3bac77f690d1d9cf57dc7851fcb3e7945.tar.gz lwn-5fd77cb3bac77f690d1d9cf57dc7851fcb3e7945.zip | |
EDAC, pnd2: Conditionally unhide/hide the P2SB PCI device to read BAR
On Deverton server, the P2SB PCI device (DEV:1F, FUN:1) is used by multiple
device drivers.
If it's hidden by some device driver (e.g. with the i801 I2C driver,
the commit
9424693035a5 ("i2c: i801: Create iTCO device on newer Intel PCHs")
unconditionally hid the P2SB PCI device wrongly) it will make the
pnd2_edac driver read out an invalid BAR value of 0xffffffff and then
fail on ioremap().
Therefore, store the presence state of P2SB PCI device before unhiding
it for reading BAR and restore the presence state after reading BAR.
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: linux-i2c@vger.kernel.org
Link: http://lkml.kernel.org/r/20170814154845.21663-1-qiuxu.zhuo@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers/edac/pnd2_edac.c')
| -rw-r--r-- | drivers/edac/pnd2_edac.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c index 2b16b95201eb..89cdd9a7a733 100644 --- a/drivers/edac/pnd2_edac.c +++ b/drivers/edac/pnd2_edac.c @@ -236,12 +236,23 @@ static u64 get_sideband_reg_base_addr(void) { struct pci_dev *pdev; u32 hi, lo; + u8 hidden; pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x19dd, NULL); if (pdev) { + /* Unhide the P2SB device, if it's hidden */ + pci_read_config_byte(pdev, 0xe1, &hidden); + if (hidden) + pci_write_config_byte(pdev, 0xe1, 0); + pci_read_config_dword(pdev, 0x10, &lo); pci_read_config_dword(pdev, 0x14, &hi); lo &= 0xfffffff0; + + /* Hide the P2SB device, if it was hidden before */ + if (hidden) + pci_write_config_byte(pdev, 0xe1, hidden); + pci_dev_put(pdev); return (U64_LSHIFT(hi, 32) | U64_LSHIFT(lo, 0)); } else { |