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drivers/pcie: Add a function for dynamic PCIe IRQ connection

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The is meant to fix a chicken & egg issue with MSI interrupt remapping.
Currently, drivers first connect the irq (by-passing any possible MSI
remapping), so the IRQ ends-up being remapped at the IOAPIC level which
is not what we want.

So adding a dedicated function to properly handle this case. This is
valid only for runtime dynamic IRQ connection obviously.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2021-03-16 09:01:28 +01:00 • committed by Anas Nashif
commit b5fecc5ff8
2 changed files with 47 additions and 0 deletions
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29
drivers/pcie/host/pcie.c
View file

@ -252,6 +252,35 @@ unsigned int pcie_get_irq(pcie_bdf_t bdf)
return PCIE_CONF_INTR_IRQ(data);
}
bool pcie_connect_dynamic_irq(pcie_bdf_t bdf,
unsigned int irq,
unsigned int priority,
void (*routine)(const void *parameter),
const void *parameter,
uint32_t flags)
{
#if defined(CONFIG_PCIE_MSI) && defined(CONFIG_PCIE_MSI_MULTI_VECTOR)
if (pcie_is_msi(bdf)) {
msi_vector_t vector;
if ((pcie_msi_vectors_allocate(bdf, priority,
&vector, 1) == 0) ||
!pcie_msi_vector_connect(bdf, &vector,
routine, parameter, flags)) {
return false;
}
} else
#endif /* CONFIG_PCIE_MSI && CONFIG_PCIE_MSI_MULTI_VECTOR */
{
if (irq_connect_dynamic(irq, priority, routine,
parameter, flags) < 0) {
return false;
}
}
return true;
}
void pcie_irq_enable(pcie_bdf_t bdf, unsigned int irq)
{
#if CONFIG_PCIE_MSI

18
include/drivers/pcie/pcie.h
View file

@ -181,6 +181,24 @@ extern uint32_t pcie_get_cap(pcie_bdf_t bdf, uint32_t cap_id);
*/
extern uint32_t pcie_get_ext_cap(pcie_bdf_t bdf, uint32_t cap_id);
/**
* @brief Dynamically connect a PCIe endpoint IRQ to an ISR handler
*
* @param bdf the PCI endpoint to examine
* @param irq the IRQ to connect (see pcie_alloc_irq())
* @param priority priority of the IRQ
* @param routine the ISR handler to connect to the IRQ
* @param parameter the parameter to provide to the handler
* @param flags IRQ connection flags
* @return true if connected, false otherwise
*/
extern bool pcie_connect_dynamic_irq(pcie_bdf_t bdf,
unsigned int irq,
unsigned int priority,
void (*routine)(const void *parameter),
const void *parameter,
uint32_t flags);
/*
* Configuration word 13 contains the head of the capabilities list.
*/