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ppc/pnv: Add support for PQ offload on PHB5

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The PQ_disable configuration bit disables the check done on the PQ
state bits when processing new MSI interrupts. When bit 9 is enabled,
the PHB forwards any MSI trigger to the XIVE interrupt controller
without checking the PQ state bits. The XIVE IC knows from the trigger
message that the PQ bits have not been checked and performs the check
locally.

This configuration bit only applies to MSIs and LSIs are still checked
on the PHB to handle the assertion level.

PQ_disable enablement is a requirement for StoreEOI.

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Cédric Le Goater 2022-03-02 06:51:39 +01:00
parent 0aa2612a01
commit c6b8cc370d
4 changed files with 32 additions and 1 deletions
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22
hw/intc/xive.c
View File

@ -886,6 +886,16 @@ static bool xive_source_lsi_trigger(XiveSource *xsrc, uint32_t srcno)
}
}
/*
* Sources can be configured with PQ offloading in which case the check
* on the PQ state bits of MSIs is disabled
*/
static bool xive_source_esb_disabled(XiveSource *xsrc, uint32_t srcno)
{
return (xsrc->esb_flags & XIVE_SRC_PQ_DISABLE) &&
!xive_source_irq_is_lsi(xsrc, srcno);
}
/*
* Returns whether the event notification should be forwarded.
*/
@ -895,6 +905,10 @@ static bool xive_source_esb_trigger(XiveSource *xsrc, uint32_t srcno)
assert(srcno < xsrc->nr_irqs);
if (xive_source_esb_disabled(xsrc, srcno)) {
return true;
}
ret = xive_esb_trigger(&xsrc->status[srcno]);
if (xive_source_irq_is_lsi(xsrc, srcno) &&
@ -915,6 +929,11 @@ static bool xive_source_esb_eoi(XiveSource *xsrc, uint32_t srcno)
assert(srcno < xsrc->nr_irqs);
if (xive_source_esb_disabled(xsrc, srcno)) {
qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid EOI for IRQ %d\n", srcno);
return false;
}
ret = xive_esb_eoi(&xsrc->status[srcno]);
/*
@ -936,9 +955,10 @@ static bool xive_source_esb_eoi(XiveSource *xsrc, uint32_t srcno)
static void xive_source_notify(XiveSource *xsrc, int srcno)
{
XiveNotifierClass *xnc = XIVE_NOTIFIER_GET_CLASS(xsrc->xive);
bool pq_checked = !xive_source_esb_disabled(xsrc, srcno);
if (xnc->notify) {
xnc->notify(xsrc->xive, srcno, true);
xnc->notify(xsrc->xive, srcno, pq_checked);
}
}

9
hw/pci-host/pnv_phb4.c
View File

@ -485,6 +485,15 @@ static void pnv_phb4_update_xsrc(PnvPHB4 *phb)
flags = 0;
}
/*
* When the PQ disable configuration bit is set, the check on the
* PQ state bits is disabled on the PHB side (for MSI only) and it
* is performed on the IC side instead.
*/
if (phb->regs[PHB_CTRLR >> 3] & PHB_CTRLR_IRQ_PQ_DISABLE) {
flags |= XIVE_SRC_PQ_DISABLE;
}
phb->xsrc.esb_shift = shift;
phb->xsrc.esb_flags = flags;

1
include/hw/pci-host/pnv_phb4_regs.h
View File

@ -225,6 +225,7 @@
/* Fundamental register set B */
#define PHB_VERSION 0x800
#define PHB_CTRLR 0x810
#define PHB_CTRLR_IRQ_PQ_DISABLE PPC_BIT(9) /* P10 */
#define PHB_CTRLR_IRQ_PGSZ_64K PPC_BIT(11)
#define PHB_CTRLR_IRQ_STORE_EOI PPC_BIT(12)
#define PHB_CTRLR_MMIO_RD_STRICT PPC_BIT(13)

1
include/hw/ppc/xive.h
View File

@ -176,6 +176,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(XiveSource, XIVE_SOURCE)
*/
#define XIVE_SRC_H_INT_ESB 0x1 /* ESB managed with hcall H_INT_ESB */
#define XIVE_SRC_STORE_EOI 0x2 /* Store EOI supported */
#define XIVE_SRC_PQ_DISABLE 0x4 /* Disable check on the PQ state bits */
struct XiveSource {
DeviceState parent;