diff options
| author |   Ian Munsie <imunsie@au1.ibm.com> | 2016-07-14 07:17:08 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2016-07-14 20:26:57 +1000 |
| commit | 79384e4b71240abf50c375eea56060b0d79c242a (patch) | |
| tree | 02d0c6eba0afa7755a9d8f24fb78d55137634ea4 /drivers/misc | |
| parent | cxl: Add support for using the kernel API with a real PHB (diff) | |
| download | linux-dev-79384e4b71240abf50c375eea56060b0d79c242a.tar.xz linux-dev-79384e4b71240abf50c375eea56060b0d79c242a.zip | |
cxl: Add kernel APIs to get & set the max irqs per context
These APIs will be used by the Mellanox CX4 support. While they function
standalone to configure existing behaviour, their primary purpose is to
allow the Mellanox driver to inform the cxl driver of a hardware
limitation, which will be used in a future patch.
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/cxl/api.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c index 6a030bf71655..1e2c0d9f1df7 100644 --- a/drivers/misc/cxl/api.c +++ b/drivers/misc/cxl/api.c @@ -447,3 +447,30 @@ ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count) return cxl_ops->read_adapter_vpd(afu->adapter, buf, count); } EXPORT_SYMBOL_GPL(cxl_read_adapter_vpd); + +int cxl_set_max_irqs_per_process(struct pci_dev *dev, int irqs) +{ + struct cxl_afu *afu = cxl_pci_to_afu(dev); + if (IS_ERR(afu)) + return -ENODEV; + + if (irqs > afu->adapter->user_irqs) + return -EINVAL; + + /* Limit user_irqs to prevent the user increasing this via sysfs */ + afu->adapter->user_irqs = irqs; + afu->irqs_max = irqs; + + return 0; +} +EXPORT_SYMBOL_GPL(cxl_set_max_irqs_per_process); + +int cxl_get_max_irqs_per_process(struct pci_dev *dev) +{ + struct cxl_afu *afu = cxl_pci_to_afu(dev); + if (IS_ERR(afu)) + return -ENODEV; + + return afu->irqs_max; +} +EXPORT_SYMBOL_GPL(cxl_get_max_irqs_per_process); |