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| author | Philippe Bergheaud <felix@linux.ibm.com> | 2020-06-19 17:04:39 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-07-15 04:07:19 +0300 |
| commit | 87db7579ebd5ded337056eb765542eb2608f16e3 (patch) | |
| tree | c57c5124e686993625127553f9f92f3b4a56f4bc /drivers/misc/ocxl/sysfs.c | |
| parent | acccc984c1f2e49225b40f1d0d20d383ec27d4d0 (diff) | |
| download | linux-87db7579ebd5ded337056eb765542eb2608f16e3.tar.xz | |
ocxl: control via sysfs whether the FPGA is reloaded on a link reset
Some opencapi FPGA images allow to control if the FPGA should be reloaded
on the next adapter reset. If it is supported, the image specifies it
through a Vendor Specific DVSEC in the config space of function 0.
Signed-off-by: Philippe Bergheaud <felix@linux.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200619140439.153962-1-fbarrat@linux.ibm.com
Diffstat (limited to 'drivers/misc/ocxl/sysfs.c')
| -rw-r--r-- | drivers/misc/ocxl/sysfs.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c index 58f1ba264206..25c78df8055d 100644 --- a/drivers/misc/ocxl/sysfs.c +++ b/drivers/misc/ocxl/sysfs.c @@ -51,11 +51,46 @@ static ssize_t contexts_show(struct device *device, afu->pasid_count, afu->pasid_max); } +static ssize_t reload_on_reset_show(struct device *device, + struct device_attribute *attr, + char *buf) +{ + struct ocxl_afu *afu = to_afu(device); + struct ocxl_fn *fn = afu->fn; + struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent); + int val; + + if (ocxl_config_get_reset_reload(pci_dev, &val)) + return scnprintf(buf, PAGE_SIZE, "unavailable\n"); + + return scnprintf(buf, PAGE_SIZE, "%d\n", val); +} + +static ssize_t reload_on_reset_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ocxl_afu *afu = to_afu(device); + struct ocxl_fn *fn = afu->fn; + struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent); + int rc, val; + + rc = kstrtoint(buf, 0, &val); + if (rc || (val != 0 && val != 1)) + return -EINVAL; + + if (ocxl_config_set_reset_reload(pci_dev, val)) + return -ENODEV; + + return count; +} + static struct device_attribute afu_attrs[] = { __ATTR_RO(global_mmio_size), __ATTR_RO(pp_mmio_size), __ATTR_RO(afu_version), __ATTR_RO(contexts), + __ATTR_RW(reload_on_reset), }; static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj, |