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powerpc/vas: Alloc and setup IRQ and trigger port address

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Allocate a xive irq on each chip with a vas instance. The NX coprocessor
raises a host CPU interrupt via vas if it encounters page fault on user
space request buffer. Subsequent patches register the trigger port with
the NX coprocessor, and create a vas fault handler for this interrupt
mapping.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1587016806.2275.1050.camel@hbabu-laptop
This commit is contained in:
Haren Myneni 2020-04-15 23:00:06 -07:00 committed by Michael Ellerman
parent 73a8077938
commit c20e1e299d
2 changed files with 40 additions and 6 deletions
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44
arch/powerpc/platforms/powernv/vas.c
View File

@ -15,6 +15,7 @@
#include <linux/of_address.h>
#include <linux/of.h>
#include <asm/prom.h>
#include <asm/xive.h>
#include "vas.h"
@ -25,10 +26,12 @@ static DEFINE_PER_CPU(int, cpu_vas_id);
static int init_vas_instance(struct platform_device *pdev)
{
int rc, cpu, vasid;
struct resource *res;
struct vas_instance *vinst;
struct device_node *dn = pdev->dev.of_node;
struct vas_instance *vinst;
struct xive_irq_data *xd;
uint32_t chipid, hwirq;
struct resource *res;
int rc, cpu, vasid;
rc = of_property_read_u32(dn, "ibm,vas-id", &vasid);
if (rc) {
@ -36,6 +39,12 @@ static int init_vas_instance(struct platform_device *pdev)
return -ENODEV;
}
rc = of_property_read_u32(dn, "ibm,chip-id", &chipid);
if (rc) {
pr_err("No ibm,chip-id property for %s?\n", pdev->name);
return -ENODEV;
}
if (pdev->num_resources != 4) {
pr_err("Unexpected DT configuration for [%s, %d]\n",
pdev->name, vasid);
@ -69,9 +78,32 @@ static int init_vas_instance(struct platform_device *pdev)
vinst->paste_win_id_shift = 63 - res->end;
pr_devel("Initialized instance [%s, %d], paste_base 0x%llx, "
"paste_win_id_shift 0x%llx\n", pdev->name, vasid,
vinst->paste_base_addr, vinst->paste_win_id_shift);
hwirq = xive_native_alloc_irq_on_chip(chipid);
if (!hwirq) {
pr_err("Inst%d: Unable to allocate global irq for chip %d\n",
vinst->vas_id, chipid);
return -ENOENT;
}
vinst->virq = irq_create_mapping(NULL, hwirq);
if (!vinst->virq) {
pr_err("Inst%d: Unable to map global irq %d\n",
vinst->vas_id, hwirq);
return -EINVAL;
}
xd = irq_get_handler_data(vinst->virq);
if (!xd) {
pr_err("Inst%d: Invalid virq %d\n",
vinst->vas_id, vinst->virq);
return -EINVAL;
}
vinst->irq_port = xd->trig_page;
pr_devel("Initialized instance [%s, %d] paste_base 0x%llx paste_win_id_shift 0x%llx IRQ %d Port 0x%llx\n",
pdev->name, vasid, vinst->paste_base_addr,
vinst->paste_win_id_shift, vinst->virq,
vinst->irq_port);
for_each_possible_cpu(cpu) {
if (cpu_to_chip_id(cpu) == of_get_ibm_chip_id(dn))

2
arch/powerpc/platforms/powernv/vas.h
View File

@ -313,6 +313,8 @@ struct vas_instance {
u64 paste_base_addr;
u64 paste_win_id_shift;
u64 irq_port;
int virq;
struct mutex mutex;
struct vas_window *rxwin[VAS_COP_TYPE_MAX];
struct vas_window *windows[VAS_WINDOWS_PER_CHIP];