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iommm/vt-d: Store irq domain in struct device

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As a first step to make X86 utilize the direct MSI irq domain operations
store the irq domain pointer in the device struct when a device is probed.

This is done from dmar_pci_bus_add_dev() because it has to work even when
DMA remapping is disabled. It only overrides the irqdomain of devices which
are handled by a regular PCI/MSI irq domain which protects PCI devices
behind special busses like VMD which have their own irq domain.

No functional change. It just avoids the redirection through
arch_*_msi_irqs() and allows the PCI/MSI core to directly invoke the irq
domain alloc/free functions instead of having to look up the irq domain for
every single MSI interupt.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200826112333.714566121@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-08-26 13:16:59 +02:00
parent 2e4386eba0
commit 85a8dfc57a
3 changed files with 26 additions and 0 deletions
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3
drivers/iommu/intel/dmar.c
View File

@ -316,6 +316,9 @@ static int dmar_pci_bus_add_dev(struct dmar_pci_notify_info *info)
if (ret < 0 && dmar_dev_scope_status == 0)
dmar_dev_scope_status = ret;
if (ret >= 0)
intel_irq_remap_add_device(info);
return ret;
}

16
drivers/iommu/intel/irq_remapping.c
View File

@ -1092,6 +1092,22 @@ error:
return -1;
}
/*
* Store the MSI remapping domain pointer in the device if enabled.
*
* This is called from dmar_pci_bus_add_dev() so it works even when DMA
* remapping is disabled. Only update the pointer if the device is not
* already handled by a non default PCI/MSI interrupt domain. This protects
* e.g. VMD devices.
*/
void intel_irq_remap_add_device(struct dmar_pci_notify_info *info)
{
if (!irq_remapping_enabled || pci_dev_has_special_msi_domain(info->dev))
return;
dev_set_msi_domain(&info->dev->dev, map_dev_to_ir(info->dev));
}
static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
{
memset(irte, 0, sizeof(*irte));

7
include/linux/intel-iommu.h
View File

@ -425,6 +425,8 @@ struct q_inval {
int free_cnt;
};
struct dmar_pci_notify_info;
#ifdef CONFIG_IRQ_REMAP
/* 1MB - maximum possible interrupt remapping table size */
#define INTR_REMAP_PAGE_ORDER 8
@ -439,6 +441,11 @@ struct ir_table {
struct irte *base;
unsigned long *bitmap;
};
void intel_irq_remap_add_device(struct dmar_pci_notify_info *info);
#else
static inline void
intel_irq_remap_add_device(struct dmar_pci_notify_info *info) { }
#endif
struct iommu_flush {