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| author | Tyrel Datwyler <tyreld@linux.ibm.com> | 2021-04-01 18:13:25 -0600 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-04-20 14:22:24 +1000 |
| commit | 39d0099f94390eb7a677e1a5c9bb56a4daa242a1 (patch) | |
| tree | 581ebaaa32930995e7409ae40fd58882cf7b9967 /arch/powerpc | |
| parent | af31fd0c9107e400a8eb89d0eafb40bb78802f79 (diff) | |
| download | linux-stable-39d0099f94390eb7a677e1a5c9bb56a4daa242a1.tar.gz linux-stable-39d0099f94390eb7a677e1a5c9bb56a4daa242a1.tar.bz2 linux-stable-39d0099f94390eb7a677e1a5c9bb56a4daa242a1.zip | |
powerpc/pseries: Add shutdown() to vio_driver and vio_bus
Currently, neither the vio_bus or vio_driver structures provide support
for a shutdown() routine.
Add support for shutdown() by allowing drivers to provide a
implementation via function pointer in their vio_driver struct and
provide a proper implementation in the driver template for the vio_bus
that calls a vio drivers shutdown() if defined.
In the case that no shutdown() is defined by a vio driver and a kexec is
in progress we implement a big hammer that calls remove() to ensure no
further DMA for the devices is possible.
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210402001325.939668-1-tyreld@linux.ibm.com
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/vio.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/vio.c | 16 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/vio.h b/arch/powerpc/include/asm/vio.h index 721c0d6715ac..e7479a4abf96 100644 --- a/arch/powerpc/include/asm/vio.h +++ b/arch/powerpc/include/asm/vio.h @@ -114,6 +114,7 @@ struct vio_driver { const struct vio_device_id *id_table; int (*probe)(struct vio_dev *dev, const struct vio_device_id *id); void (*remove)(struct vio_dev *dev); + void (*shutdown)(struct vio_dev *dev); /* A driver must have a get_desired_dma() function to * be loaded in a CMO environment if it uses DMA. */ diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c index 429053d0402a..e00f3725ec96 100644 --- a/arch/powerpc/platforms/pseries/vio.c +++ b/arch/powerpc/platforms/pseries/vio.c @@ -22,6 +22,7 @@ #include <linux/mm.h> #include <linux/dma-map-ops.h> #include <linux/kobject.h> +#include <linux/kexec.h> #include <asm/iommu.h> #include <asm/dma.h> @@ -1278,6 +1279,20 @@ static int vio_bus_remove(struct device *dev) return 0; } +static void vio_bus_shutdown(struct device *dev) +{ + struct vio_dev *viodev = to_vio_dev(dev); + struct vio_driver *viodrv; + + if (dev->driver) { + viodrv = to_vio_driver(dev->driver); + if (viodrv->shutdown) + viodrv->shutdown(viodev); + else if (kexec_in_progress) + vio_bus_remove(dev); + } +} + /** * vio_register_driver: - Register a new vio driver * @viodrv: The vio_driver structure to be registered. @@ -1617,6 +1632,7 @@ struct bus_type vio_bus_type = { .match = vio_bus_match, .probe = vio_bus_probe, .remove = vio_bus_remove, + .shutdown = vio_bus_shutdown, }; /** |