diff options
| author | Marc Zyngier <maz@kernel.org> | 2020-11-29 13:52:06 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-12-11 14:47:50 +0000 |
| commit | 91f90daa4fb2b77db7aa25ef2e0206f2e3962665 (patch) | |
| tree | 80bfb7c66e37106508a00adbd1726f0046149510 /include/asm-generic | |
| parent | fc6c7cd3878641fd43189f15697e7ad0871f5c1a (diff) | |
platform-msi: Track shared domain allocation
We have two flavours of platform-MSI:
- MSIs generated by devices for themselves (the usual case)
- MSIs generated on behalf of other devices, as the generating
device is some form of bridge (either a wire-to-MSI bridge,
or even a non-transparent PCI bridge that repaints the PCI
requester ID).
In the latter case, the underlying interrupt architecture may need
to track this in order to keep the mapping alive even when no MSI
are currently being generated.
Add a set of flags to the generic msi_alloc_info_t structure, as
well as the MSI_ALLOC_FLAGS_PROXY_DEVICE flag that will get
advertized by the platform-MSI code when allocating an irqdomain
for a device.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Tested-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20201129135208.680293-2-maz@kernel.org
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/msi.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/asm-generic/msi.h b/include/asm-generic/msi.h index e6795f088bdd..1010e74cb8e0 100644 --- a/include/asm-generic/msi.h +++ b/include/asm-generic/msi.h @@ -22,12 +22,16 @@ struct msi_desc; typedef struct msi_alloc_info { struct msi_desc *desc; irq_hw_number_t hwirq; + unsigned long flags; union { unsigned long ul; void *ptr; } scratchpad[NUM_MSI_ALLOC_SCRATCHPAD_REGS]; } msi_alloc_info_t; +/* Device generating MSIs is proxying for another device */ +#define MSI_ALLOC_FLAGS_PROXY_DEVICE (1UL << 0) + #define GENERIC_MSI_DOMAIN_OPS 1 #endif |