diff options
author | Marc Zyngier <maz@kernel.org> | 2020-11-29 14:52:06 +0100 |
---|---|---|
committer | Marc Zyngier <maz@kernel.org> | 2020-12-11 15:47:50 +0100 |
commit | 91f90daa4fb2b77db7aa25ef2e0206f2e3962665 (patch) | |
tree | 80bfb7c66e37106508a00adbd1726f0046149510 /drivers/base/platform-msi.c | |
parent | irqchip/ti-sci-intr: Fix freeing of irqs (diff) | |
download | linux-91f90daa4fb2b77db7aa25ef2e0206f2e3962665.tar.xz linux-91f90daa4fb2b77db7aa25ef2e0206f2e3962665.zip |
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 'drivers/base/platform-msi.c')
-rw-r--r-- | drivers/base/platform-msi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c index c4a17e5edf8b..2c1e2e0c1a59 100644 --- a/drivers/base/platform-msi.c +++ b/drivers/base/platform-msi.c @@ -59,9 +59,15 @@ static int platform_msi_init(struct irq_domain *domain, return irq_domain_set_hwirq_and_chip(domain, virq, hwirq, info->chip, info->chip_data); } + +static void platform_msi_set_proxy_dev(msi_alloc_info_t *arg) +{ + arg->flags |= MSI_ALLOC_FLAGS_PROXY_DEVICE; +} #else #define platform_msi_set_desc NULL #define platform_msi_init NULL +#define platform_msi_set_proxy_dev(x) do {} while(0) #endif static void platform_msi_update_dom_ops(struct msi_domain_info *info) @@ -343,6 +349,7 @@ __platform_msi_create_device_domain(struct device *dev, if (!domain) goto free_priv; + platform_msi_set_proxy_dev(&data->arg); err = msi_domain_prepare_irqs(domain->parent, dev, nvec, &data->arg); if (err) goto free_domain; |