diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_heci_gsc.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_heci_gsc.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_heci_gsc.c b/drivers/gpu/drm/xe/xe_heci_gsc.c new file mode 100644 index 0000000000..bfdd33b9b2 --- /dev/null +++ b/drivers/gpu/drm/xe/xe_heci_gsc.c @@ -0,0 +1,234 @@ +// 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); +} |