korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-30 23:54:04 +08:00
Code Issues Packages Projects Releases Wiki Activity

cxl: Add checksum verification to CDAT from CXL

Browse Source 
A CDAT table is available from a CXL device. The table is read by the
driver and cached in software. With the CXL subsystem needing to parse the
CDAT table, the checksum should be verified. Add checksum verification
after the CDAT table is read from device.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/169713682277.2205276.2687265961314933628.stgit@djiang5-mobl3
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2023-10-12 11:53:42 -07:00 committed by Dan Williams
parent 529c0a4404
commit 670e4e88f3
1 changed files with 23 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/cxl/core/pci.c
View File

@ -595,6 +595,16 @@ static int cxl_cdat_read_table(struct device *dev,
return 0;
}
static unsigned char cdat_checksum(void *buf, size_t size)
{
unsigned char sum, *data = buf;
size_t i;
for (sum = 0, i = 0; i < size; i++)
sum += data[i];
return sum;
}
/**
* read_cdat_data - Read the CDAT data on this port
* @port: Port to read data from
@ -634,15 +644,21 @@ void read_cdat_data(struct cxl_port *port)
return;
rc = cxl_cdat_read_table(dev, cdat_doe, cdat_table, &cdat_length);
if (rc) {
/* Don't leave table data allocated on error */
devm_kfree(dev, cdat_table);
dev_err(dev, "CDAT data read error\n");
return;
}
if (rc)
goto err;
port->cdat.table = cdat_table + sizeof(__le32);
cdat_table = cdat_table + sizeof(__le32);
if (cdat_checksum(cdat_table, cdat_length))
goto err;
port->cdat.table = cdat_table;
port->cdat.length = cdat_length;
return;
err:
/* Don't leave table data allocated on error */
devm_kfree(dev, cdat_table);
dev_err(dev, "Failed to read/validate CDAT.\n");
}
EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL);