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ocxl: Fix access to the AFU Descriptor Data

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The AFU Information DVSEC capability is a means to extract common,
general information about all of the AFUs associated with a Function
independent of the specific functionality that each AFU provides.
Write in the AFU Index field allows to access to the descriptor data
for each AFU.

With the current code, we are not able to access to these specific data
when the index >= 1 because we are writing to the wrong location.
All requests to the data of each AFU are pointing to those of the AFU 0,
which could have impacts when using a card with more than one AFU per
function.

This patch fixes the access to the AFU Descriptor Data indexed by the
AFU Info Index field.

Fixes: 5ef3166e8a ("ocxl: Driver code for 'generic' opencapi devices")
Cc: stable <stable@vger.kernel.org>     # 4.16
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>

Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Lombard 2018-08-14 14:45:15 +02:00 committed by Michael Ellerman
parent 3f7daf3d75
commit 6f8e45f7eb
1 changed files with 3 additions and 1 deletions
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4
drivers/misc/ocxl/config.c
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@ -280,7 +280,9 @@ int ocxl_config_check_afu_index(struct pci_dev *dev,
u32 val;
int rc, templ_major, templ_minor, len;
pci_write_config_word(dev, fn->dvsec_afu_info_pos, afu_idx);
pci_write_config_byte(dev,
fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
afu_idx);
rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_VERSION, &val);
if (rc)
return rc;