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// SPDX-License-Identifier: MIT
/*
* Copyright(c) 2023, Intel Corporation. All rights reserved.
*/
#include <linux/irq.h>
#include <linux/mei_aux.h>
#include <linux/pci.h>
#include <linux/sizes.h>
#include "xe_device_types.h"
#include "xe_drv.h"
#include "xe_heci_gsc.h"
#include "xe_platform_types.h"
#define GSC_BAR_LENGTH 0x00000FFC
#define DG1_GSC_HECI2_BASE 0x259000
#define PVC_GSC_HECI2_BASE 0x285000
#define DG2_GSC_HECI2_BASE 0x374000
static void heci_gsc_irq_mask(struct irq_data *d)
{
/* generic irq handling */
}
static void heci_gsc_irq_unmask(struct irq_data *d)
{
/* generic irq handling */
}
static struct irq_chip heci_gsc_irq_chip = {
.name = "gsc_irq_chip",
.irq_mask = heci_gsc_irq_mask,
.irq_unmask = heci_gsc_irq_unmask,
};
static int heci_gsc_irq_init(int irq)
{
irq_set_chip_and_handler_name(irq, &heci_gsc_irq_chip,
handle_simple_irq, "heci_gsc_irq_handler");
return irq_set_chip_data(irq, NULL);
}
/**
* struct heci_gsc_def - graphics security controller heci interface definitions
*
* @name: name of the heci device
* @bar: address of the mmio bar
* @bar_size: size of the mmio bar
* @use_polling: indication of using polling mode for the device
* @slow_firmware: indication of whether the device is slow (needs longer timeouts)
*/
struct heci_gsc_def {
const char *name;
unsigned long bar;
size_t bar_size;
bool use_polling;
bool slow_firmware;
};
/* gsc resources and definitions */
static const struct heci_gsc_def heci_gsc_def_dg1 = {
.name = "mei-gscfi",
.bar = DG1_GSC_HECI2_BASE,
.bar_size = GSC_BAR_LENGTH,
};
static const struct heci_gsc_def heci_gsc_def_dg2 = {
.name = "mei-gscfi",
.bar = DG2_GSC_HECI2_BASE,
.bar_size = GSC_BAR_LENGTH,
};
static const struct heci_gsc_def heci_gsc_def_pvc = {
.name = "mei-gscfi",
.bar = PVC_GSC_HECI2_BASE,
.bar_size = GSC_BAR_LENGTH,
.slow_firmware = true,
};
static void heci_gsc_release_dev(struct device *dev)
{
struct auxiliary_device *aux_dev = to_auxiliary_dev(dev);
struct mei_aux_device *adev = auxiliary_dev_to_mei_aux_dev(aux_dev);
kfree(adev);
}
void xe_heci_gsc_fini(struct xe_device *xe)
{
struct xe_heci_gsc *heci_gsc = &xe->heci_gsc;
if (!HAS_HECI_GSCFI(xe))
return;
if (heci_gsc->adev) {
struct auxiliary_device *aux_dev = &heci_gsc->adev->aux_dev;
auxiliary_device_delete(aux_dev);
auxiliary_device_uninit(aux_dev);
heci_gsc->adev = NULL;
}
if (heci_gsc->irq >= 0)
irq_free_desc(heci_gsc->irq);
heci_gsc->irq = -1;
}
static int heci_gsc_irq_setup(struct xe_device *xe)
{
struct xe_heci_gsc *heci_gsc = &xe->heci_gsc;
int ret;
heci_gsc->irq = irq_alloc_desc(0);
if (heci_gsc->irq < 0) {
drm_err(&xe->drm, "gsc irq error %d\n", heci_gsc->irq);
return heci_gsc->irq;
}
ret = heci_gsc_irq_init(heci_gsc->irq);
if (ret < 0)
drm_err(&xe->drm, "gsc irq init failed %d\n", ret);
return ret;
}
static int heci_gsc_add_device(struct xe_device *xe, const struct heci_gsc_def *def)
{
struct xe_heci_gsc *heci_gsc = &xe->heci_gsc;
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
struct auxiliary_device *aux_dev;
struct mei_aux_device *adev;
int ret;
adev = kzalloc(sizeof(*adev), GFP_KERNEL);
if (!adev)
return -ENOMEM;
adev->irq = heci_gsc->irq;
adev->bar.parent = &pdev->resource[0];
adev->bar.start = def->bar + pdev->resource[0].start;
adev->bar.end = adev->bar.start + def->bar_size - 1;
adev->bar.flags = IORESOURCE_MEM;
adev->bar.desc = IORES_DESC_NONE;
adev->slow_firmware = def->slow_firmware;
aux_dev = &adev->aux_dev;
aux_dev->name = def->name;
aux_dev->id = (pci_domain_nr(pdev->bus) << 16) |
PCI_DEVID(pdev->bus->number, pdev->devfn);
aux_dev->dev.parent = &pdev->dev;
aux_dev->dev.release = heci_gsc_release_dev;
ret = auxiliary_device_init(aux_dev);
if (ret < 0) {
drm_err(&xe->drm, "gsc aux init failed %d\n", ret);
kfree(adev);
return ret;
}
heci_gsc->adev = adev; /* needed by the notifier */
ret = auxiliary_device_add(aux_dev);
if (ret < 0) {
drm_err(&xe->drm, "gsc aux add failed %d\n", ret);
heci_gsc->adev = NULL;
/* adev will be freed with the put_device() and .release sequence */
auxiliary_device_uninit(aux_dev);
}
return ret;
}
void xe_heci_gsc_init(struct xe_device *xe)
{
struct xe_heci_gsc *heci_gsc = &xe->heci_gsc;
const struct heci_gsc_def *def;
int ret;
if (!HAS_HECI_GSCFI(xe))
return;
heci_gsc->irq = -1;
if (xe->info.platform == XE_PVC) {
def = &heci_gsc_def_pvc;
} else if (xe->info.platform == XE_DG2) {
def = &heci_gsc_def_dg2;
} else if (xe->info.platform == XE_DG1) {
def = &heci_gsc_def_dg1;
} else {
drm_warn_once(&xe->drm, "Unknown platform\n");
return;
}
if (!def->name) {
drm_warn_once(&xe->drm, "HECI is not implemented!\n");
return;
}
if (!def->use_polling) {
ret = heci_gsc_irq_setup(xe);
if (ret)
goto fail;
}
ret = heci_gsc_add_device(xe, def);
if (ret)
goto fail;
return;
fail:
xe_heci_gsc_fini(xe);
}
void xe_heci_gsc_irq_handler(struct xe_device *xe, u32 iir)
{
int ret;
if ((iir & GSC_IRQ_INTF(1)) == 0)
return;
if (!HAS_HECI_GSCFI(xe)) {
drm_warn_once(&xe->drm, "GSC irq: not supported");
return;
}
if (xe->heci_gsc.irq < 0)
return;
ret = generic_handle_irq(xe->heci_gsc.irq);
if (ret)
drm_err_ratelimited(&xe->drm, "error handling GSC irq: %d\n", ret);
}
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