8000 Some re-arrangement and refining by liujing2 · Pull Request #2 · zhabinecho/linux · GitHub
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Some re-arrangement and refining #2

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Some re-arrangement and refining #2

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df4c278
virtio-mmio: add notify feature for per-queue
zhabinecho Dec 30, 2019
f7da48a
Refine feature bit finalizing and some renaming
Jan 17, 2020
0ccb6e9
virtio-mmio: Refactor common functionality
Jan 19, 2020
e8d6123
virtio-mmio: Create a generic MSI irq domain
Jan 19, 2020
4ff299b
virtio-mmio: Add MSI feature bit definition
Jan 20, 2020
0c26985
virtio-mmio: Add MSI interrupt support
Jan 20, 2020
e361370
virtio-mmio: Enable MSI sharing mode
Jan 20, 2020
2ac726d
x86: virtio-mmio: support virtio-mmio with MSI for x86
Jan 20, 2020
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11 changes: 10 additions & 1 deletion arch/x86/kernel/apic/msi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,11 @@

static struct irq_domain *msi_default_domain;

static void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
/*
* x86 PCI-MSI/HPET/DMAR related method.
* Also can be used as arch specific method for virtio-mmio MSI.
*/
void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
{
struct irq_cfg *cfg = irqd_cfg(data);

Expand All @@ -47,6 +51,11 @@ static void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
MSI_DATA_VECTOR(cfg->vector);
}

struct irq_domain *arch_msi_root_irq_domain(void)
{
return x86_vector_domain;
}

/*
* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
* which implement the MS 8000 I or MSI-X Capability Structure.
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4 changes: 2 additions & 2 deletions drivers/base/platform-msi.c
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Expand Up @@ -31,12 +31,11 @@ struct platform_msi_priv_data {
/* The devid allocator */
static DEFINE_IDA(platform_msi_devid_ida);

#ifdef GENERIC_MSI_DOMAIN_OPS
/*
* Convert an msi_desc to a globaly unique identifier (per-device
* devid + msi_desc position in the msi_list).
*/
static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
{
u32 devid;

Expand All @@ -45,6 +44,7 @@ static irq_hw_number_t platform_msi_calc_hwirq(struct msi_desc *desc)
return (devid << (32 - DEV_ID_SHIFT)) | desc->platform.msi_index;
}

#ifdef GENERIC_MSI_DOMAIN_OPS
static void platform_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
arg->desc = desc;
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8 changes: 8 additions & 0 deletions drivers/virtio/Kconfig
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Expand Up @@ -84,6 +84,14 @@ config VIRTIO_MMIO

If unsure, say N.

config VIRTIO_MMIO_MSI
bool "Memory-mapped virtio device MSI"
depends on VIRTIO_MMIO && GENERIC_MSI_IRQ_DOMAIN && GENERIC_MSI_IRQ
---help---
This allows device drivers to enable MSI to improve performance.

If unsure, say N.

config VIRTIO_MMIO_CMDLINE_DEVICES
bool "Memory mapped virtio devices parameter parsing"
depends on VIRTIO_MMIO
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