Modify the VKMS driver into an api that dce_virtual can use to create virtual displays that obey drm's atomic modesetting api.
v2: Made local functions static.
v3: Switched vkms_output kzalloc for kcalloc. Cleanup patches by moving display mode fixes to this patch.
v4: Update atomic_check and atomic_update to comply with new kms api.
Reported-by: kernel test robot lkp@intel.com Suggested-by: Alex Deucher Alexander.Deucher@amd.com Signed-off-by: Ryan Taylor Ryan.Taylor@amd.com --- drivers/gpu/drm/amd/amdgpu/Makefile | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 2 +- drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 446 +++++++++++++++++++++++ drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h | 29 ++ drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 23 +- 7 files changed, 493 insertions(+), 11 deletions(-) create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile index f089794bbdd5..30cbcd5ce1cc 100644 --- a/drivers/gpu/drm/amd/amdgpu/Makefile +++ b/drivers/gpu/drm/amd/amdgpu/Makefile @@ -120,6 +120,7 @@ amdgpu-y += \ amdgpu-y += \ dce_v10_0.o \ dce_v11_0.o \ + amdgpu_vkms.o \ dce_virtual.o
# add GFX block diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index d10baa3338bc..96e895d6be35 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -916,6 +916,7 @@ struct amdgpu_device {
/* display */ bool enable_virtual_display; + struct amdgpu_vkms_output *amdgpu_vkms_output; struct amdgpu_mode_info mode_info; /* For pre-DCE11. DCE11 and later are in "struct amdgpu_device->dm" */ struct work_struct hotplug_work; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c index bbc6bfadafd6..06e2a461f610 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c @@ -1230,7 +1230,7 @@ static int amdgpu_pci_probe(struct pci_dev *pdev, int ret, retry = 0; bool supports_atomic = false;
- if (!amdgpu_virtual_display && + if (amdgpu_virtual_display || amdgpu_device_asic_has_dc_support(flags & AMD_ASIC_MASK)) supports_atomic = true;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c index 09b048647523..5a143ca02cf9 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c @@ -344,7 +344,7 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev) }
/* disable all the possible outputs/crtcs before entering KMS mode */ - if (!amdgpu_device_has_dc_support(adev)) + if (!amdgpu_device_has_dc_support(adev) && !amdgpu_virtual_display) drm_helper_disable_unused_functions(adev_to_drm(adev));
drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c new file mode 100644 index 000000000000..e2810b22bb43 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c @@ -0,0 +1,446 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_simple_kms_helper.h> +#include <drm/drm_vblank.h> + +#include "amdgpu.h" +#include "amdgpu_vkms.h" +#include "amdgpu_display.h" + +/** + * DOC: amdgpu_vkms + * + * The amdgpu vkms interface provides a virtual KMS interface for several use + * cases: devices without display hardware, platforms where the actual display + * hardware is not useful (e.g., servers), SR-IOV virtual functions, device + * emulation/simulation, and device bring up prior to display hardware being + * usable. We previously emulated a legacy KMS interface, but there was a desire + * to move to the atomic KMS interface. The vkms driver did everything we + * needed, but we wanted KMS support natively in the driver without buffer + * sharing and the ability to support an instance of VKMS per device. We first + * looked at splitting vkms into a stub driver and a helper module that other + * drivers could use to implement a virtual display, but this strategy ended up + * being messy due to driver specific callbacks needed for buffer management. + * Ultimately, it proved easier to import the vkms code as it mostly used core + * drm helpers anyway. + */ + +static const u32 amdgpu_vkms_formats[] = { + DRM_FORMAT_XRGB8888, +}; + +static enum hrtimer_restart amdgpu_vkms_vblank_simulate(struct hrtimer *timer) +{ + struct amdgpu_vkms_output *output = container_of(timer, + struct amdgpu_vkms_output, + vblank_hrtimer); + struct drm_crtc *crtc = &output->crtc; + u64 ret_overrun; + bool ret; + + ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer, + output->period_ns); + WARN_ON(ret_overrun != 1); + + ret = drm_crtc_handle_vblank(crtc); + if (!ret) + DRM_ERROR("amdgpu_vkms failure on handling vblank"); + + return HRTIMER_RESTART; +} + +static int amdgpu_vkms_enable_vblank(struct drm_crtc *crtc) +{ + struct drm_device *dev = crtc->dev; + unsigned int pipe = drm_crtc_index(crtc); + struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; + struct amdgpu_vkms_output *out = drm_crtc_to_amdgpu_vkms_output(crtc); + + drm_calc_timestamping_constants(crtc, &crtc->mode); + + hrtimer_init(&out->vblank_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + out->vblank_hrtimer.function = &amdgpu_vkms_vblank_simulate; + out->period_ns = ktime_set(0, vblank->framedur_ns); + hrtimer_start(&out->vblank_hrtimer, out->period_ns, HRTIMER_MODE_REL); + + return 0; +} + +static void amdgpu_vkms_disable_vblank(struct drm_crtc *crtc) +{ + struct amdgpu_vkms_output *out = drm_crtc_to_amdgpu_vkms_output(crtc); + + hrtimer_cancel(&out->vblank_hrtimer); +} + +static bool amdgpu_vkms_get_vblank_timestamp(struct drm_crtc *crtc, + int *max_error, + ktime_t *vblank_time, + bool in_vblank_irq) +{ + struct drm_device *dev = crtc->dev; + unsigned int pipe = crtc->index; + struct amdgpu_vkms_output *output = drm_crtc_to_amdgpu_vkms_output(crtc); + struct drm_vblank_crtc *vblank = &dev->vblank[pipe]; + + if (!READ_ONCE(vblank->enabled)) { + *vblank_time = ktime_get(); + return true; + } + + *vblank_time = READ_ONCE(output->vblank_hrtimer.node.expires); + + if (WARN_ON(*vblank_time == vblank->time)) + return true; + + /* + * To prevent races we roll the hrtimer forward before we do any + * interrupt processing - this is how real hw works (the interrupt is + * only generated after all the vblank registers are updated) and what + * the vblank core expects. Therefore we need to always correct the + * timestampe by one frame. + */ + *vblank_time -= output->period_ns; + + return true; +} + +static const struct drm_crtc_funcs amdgpu_vkms_crtc_funcs = { + .set_config = drm_atomic_helper_set_config, + .destroy = drm_crtc_cleanup, + .page_flip = drm_atomic_helper_page_flip, + .reset = drm_atomic_helper_crtc_reset, + .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, + .enable_vblank = amdgpu_vkms_enable_vblank, + .disable_vblank = amdgpu_vkms_disable_vblank, + .get_vblank_timestamp = amdgpu_vkms_get_vblank_timestamp, +}; + +static void amdgpu_vkms_crtc_atomic_enable(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + drm_crtc_vblank_on(crtc); +} + +static void amdgpu_vkms_crtc_atomic_disable(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + drm_crtc_vblank_off(crtc); +} + +static void amdgpu_vkms_crtc_atomic_flush(struct drm_crtc *crtc, + struct drm_atomic_state *state) +{ + if (crtc->state->event) { + spin_lock(&crtc->dev->event_lock); + + if (drm_crtc_vblank_get(crtc) != 0) + drm_crtc_send_vblank_event(crtc, crtc->state->event); + else + drm_crtc_arm_vblank_event(crtc, crtc->state->event); + + spin_unlock(&crtc->dev->event_lock); + + crtc->state->event = NULL; + } +} + +static const struct drm_crtc_helper_funcs amdgpu_vkms_crtc_helper_funcs = { + .atomic_flush = amdgpu_vkms_crtc_atomic_flush, + .atomic_enable = amdgpu_vkms_crtc_atomic_enable, + .atomic_disable = amdgpu_vkms_crtc_atomic_disable, +}; + +static int amdgpu_vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, + struct drm_plane *primary, struct drm_plane *cursor) +{ + int ret; + + ret = drm_crtc_init_with_planes(dev, crtc, primary, cursor, + &amdgpu_vkms_crtc_funcs, NULL); + if (ret) { + DRM_ERROR("Failed to init CRTC\n"); + return ret; + } + + drm_crtc_helper_add(crtc, &amdgpu_vkms_crtc_helper_funcs); + + return ret; +} + +static const struct drm_connector_funcs amdgpu_vkms_connector_funcs = { + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = drm_connector_cleanup, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static int amdgpu_vkms_conn_get_modes(struct drm_connector *connector) +{ + struct drm_device *dev = connector->dev; + struct drm_display_mode *mode = NULL; + unsigned i; + static const struct mode_size { + int w; + int h; + } common_modes[] = { + { 640, 480}, + { 720, 480}, + { 800, 600}, + { 848, 480}, + {1024, 768}, + {1152, 768}, + {1280, 720}, + {1280, 800}, + {1280, 854}, + {1280, 960}, + {1280, 1024}, + {1440, 900}, + {1400, 1050}, + {1680, 1050}, + {1600, 1200}, + {1920, 1080}, + {1920, 1200}, + {2560, 1440}, + {4096, 3112}, + {3656, 2664}, + {3840, 2160}, + {4096, 2160}, + }; + + for (i = 0; i < ARRAY_SIZE(common_modes); i++) { + mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false); + drm_mode_probed_add(connector, mode); + } + + drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF); + + return ARRAY_SIZE(common_modes); +} + +static const struct drm_connector_helper_funcs amdgpu_vkms_conn_helper_funcs = { + .get_modes = amdgpu_vkms_conn_get_modes, +}; + +static const struct drm_plane_funcs amdgpu_vkms_plane_funcs = { + .update_plane = drm_atomic_helper_update_plane, + .disable_plane = drm_atomic_helper_disable_plane, + .destroy = drm_plane_cleanup, + .reset = drm_atomic_helper_plane_reset, + .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, +}; + +static void amdgpu_vkms_plane_atomic_update(struct drm_plane *plane, + struct drm_atomic_state *old_state) +{ + return; +} + +static int amdgpu_vkms_plane_atomic_check(struct drm_plane *plane, + struct drm_atomic_state *state) +{ + struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, + plane); + struct drm_crtc_state *crtc_state; + int ret; + + if (!new_plane_state->fb || WARN_ON(!new_plane_state->crtc)) + return 0; + + crtc_state = drm_atomic_get_crtc_state(state, + new_plane_state->crtc); + if (IS_ERR(crtc_state)) + return PTR_ERR(crtc_state); + + ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state, + DRM_PLANE_HELPER_NO_SCALING, + DRM_PLANE_HELPER_NO_SCALING, + false, true); + if (ret != 0) + return ret; + + /* for now primary plane must be visible and full screen */ + if (!new_plane_state->visible) + return -EINVAL; + + return 0; +} + +static int amdgpu_vkms_prepare_fb(struct drm_plane *plane, + struct drm_plane_state *new_state) +{ + struct amdgpu_framebuffer *afb; + struct drm_gem_object *obj; + struct amdgpu_device *adev; + struct amdgpu_bo *rbo; + struct list_head list; + struct ttm_validate_buffer tv; + struct ww_acquire_ctx ticket; + uint32_t domain; + int r; + + if (!new_state->fb) { + DRM_DEBUG_KMS("No FB bound\n"); + return 0; + } + afb = to_amdgpu_framebuffer(new_state->fb); + obj = new_state->fb->obj[0]; + rbo = gem_to_amdgpu_bo(obj); + adev = amdgpu_ttm_adev(rbo->tbo.bdev); + INIT_LIST_HEAD(&list); + + tv.bo = &rbo->tbo; + tv.num_shared = 1; + list_add(&tv.head, &list); + + r = ttm_eu_reserve_buffers(&ticket, &list, false, NULL); + if (r) { + dev_err(adev->dev, "fail to reserve bo (%d)\n", r); + return r; + } + + if (plane->type != DRM_PLANE_TYPE_CURSOR) + domain = amdgpu_display_supported_domains(adev, rbo->flags); + else + domain = AMDGPU_GEM_DOMAIN_VRAM; + + r = amdgpu_bo_pin(rbo, domain); + if (unlikely(r != 0)) { + if (r != -ERESTARTSYS) + DRM_ERROR("Failed to pin framebuffer with error %d\n", r); + ttm_eu_backoff_reservation(&ticket, &list); + return r; + } + + r = amdgpu_ttm_alloc_gart(&rbo->tbo); + if (unlikely(r != 0)) { + amdgpu_bo_unpin(rbo); + ttm_eu_backoff_reservation(&ticket, &list); + DRM_ERROR("%p bind failed\n", rbo); + return r; + } + + ttm_eu_backoff_reservation(&ticket, &list); + + afb->address = amdgpu_bo_gpu_offset(rbo); + + amdgpu_bo_ref(rbo); + + return 0; +} + +static void amdgpu_vkms_cleanup_fb(struct drm_plane *plane, + struct drm_plane_state *old_state) +{ + struct amdgpu_bo *rbo; + int r; + + if (!old_state->fb) + return; + + rbo = gem_to_amdgpu_bo(old_state->fb->obj[0]); + r = amdgpu_bo_reserve(rbo, false); + if (unlikely(r)) { + DRM_ERROR("failed to reserve rbo before unpin\n"); + return; + } + + amdgpu_bo_unpin(rbo); + amdgpu_bo_unreserve(rbo); + amdgpu_bo_unref(&rbo); +} + +static const struct drm_plane_helper_funcs amdgpu_vkms_primary_helper_funcs = { + .atomic_update = amdgpu_vkms_plane_atomic_update, + .atomic_check = amdgpu_vkms_plane_atomic_check, + .prepare_fb = amdgpu_vkms_prepare_fb, + .cleanup_fb = amdgpu_vkms_cleanup_fb, +}; + +static struct drm_plane *amdgpu_vkms_plane_init(struct drm_device *dev, + enum drm_plane_type type, + int index) +{ + struct drm_plane *plane; + int ret; + + plane = kzalloc(sizeof(*plane), GFP_KERNEL); + if (!plane) + return ERR_PTR(-ENOMEM); + + ret = drm_universal_plane_init(dev, plane, 1 << index, + &amdgpu_vkms_plane_funcs, + amdgpu_vkms_formats, + ARRAY_SIZE(amdgpu_vkms_formats), + NULL, type, NULL); + if (ret) { + kfree(plane); + return ERR_PTR(ret); + } + + drm_plane_helper_add(plane, &amdgpu_vkms_primary_helper_funcs); + + return plane; +} + +int amdgpu_vkms_output_init(struct drm_device *dev, + struct amdgpu_vkms_output *output, int index) +{ + struct drm_connector *connector = &output->connector; + struct drm_encoder *encoder = &output->encoder; + struct drm_crtc *crtc = &output->crtc; + struct drm_plane *primary, *cursor = NULL; + int ret; + + primary = amdgpu_vkms_plane_init(dev, DRM_PLANE_TYPE_PRIMARY, index); + if (IS_ERR(primary)) + return PTR_ERR(primary); + + ret = amdgpu_vkms_crtc_init(dev, crtc, primary, cursor); + if (ret) + goto err_crtc; + + ret = drm_connector_init(dev, connector, &amdgpu_vkms_connector_funcs, + DRM_MODE_CONNECTOR_VIRTUAL); + if (ret) { + DRM_ERROR("Failed to init connector\n"); + goto err_connector; + } + + drm_connector_helper_add(connector, &amdgpu_vkms_conn_helper_funcs); + + ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL); + if (ret) { + DRM_ERROR("Failed to init encoder\n"); + goto err_encoder; + } + encoder->possible_crtcs = 1 << index; + + ret = drm_connector_attach_encoder(connector, encoder); + if (ret) { + DRM_ERROR("Failed to attach connector to encoder\n"); + goto err_attach; + } + + drm_mode_config_reset(dev); + + return 0; + +err_attach: + drm_encoder_cleanup(encoder); + +err_encoder: + drm_connector_cleanup(connector); + +err_connector: + drm_crtc_cleanup(crtc); + +err_crtc: + drm_plane_cleanup(primary); + + return ret; +} diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h new file mode 100644 index 000000000000..251881b60048 --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ + +#ifndef _AMDGPU_VKMS_H_ +#define _AMDGPU_VKMS_H_ + +#define XRES_DEF 1024 +#define YRES_DEF 768 + +#define XRES_MAX 16384 +#define YRES_MAX 16384 + +#define drm_crtc_to_amdgpu_vkms_output(target) \ + container_of(target, struct amdgpu_vkms_output, crtc) + +extern const struct amdgpu_ip_block_version amdgpu_vkms_ip_block; + +struct amdgpu_vkms_output { + struct drm_crtc crtc; + struct drm_encoder encoder; + struct drm_connector connector; + struct hrtimer vblank_hrtimer; + ktime_t period_ns; + struct drm_pending_vblank_event *event; +}; + +int amdgpu_vkms_output_init(struct drm_device *dev, + struct amdgpu_vkms_output *output, int index); + +#endif /* _AMDGPU_VKMS_H_ */ diff --git a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c index 7e0d8c092c7e..f940be9d4f69 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_virtual.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_virtual.c @@ -22,6 +22,7 @@ */
#include <drm/drm_vblank.h> +#include <drm/drm_atomic_helper.h>
#include "amdgpu.h" #include "amdgpu_pm.h" @@ -40,6 +41,7 @@ #include "dce_virtual.h" #include "ivsrcid/ivsrcid_vislands30.h" #include "amdgpu_display.h" +#include "amdgpu_vkms.h"
#define DCE_VIRTUAL_VBLANK_PERIOD 16666666
@@ -374,6 +376,12 @@ static const struct drm_connector_funcs dce_virtual_connector_funcs = { .force = dce_virtual_force, };
+const struct drm_mode_config_funcs dce_virtual_mode_funcs = { + .fb_create = amdgpu_display_user_framebuffer_create, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + static int dce_virtual_sw_init(void *handle) { int r, i; @@ -385,10 +393,10 @@ static int dce_virtual_sw_init(void *handle)
adev_to_drm(adev)->max_vblank_count = 0;
- adev_to_drm(adev)->mode_config.funcs = &amdgpu_mode_funcs; + adev_to_drm(adev)->mode_config.funcs = &dce_virtual_mode_funcs;
- adev_to_drm(adev)->mode_config.max_width = 16384; - adev_to_drm(adev)->mode_config.max_height = 16384; + adev_to_drm(adev)->mode_config.max_width = XRES_MAX; + adev_to_drm(adev)->mode_config.max_height = YRES_MAX;
adev_to_drm(adev)->mode_config.preferred_depth = 24; adev_to_drm(adev)->mode_config.prefer_shadow = 1; @@ -399,15 +407,11 @@ static int dce_virtual_sw_init(void *handle) if (r) return r;
- adev_to_drm(adev)->mode_config.max_width = 16384; - adev_to_drm(adev)->mode_config.max_height = 16384; + adev->amdgpu_vkms_output = kcalloc(adev->mode_info.num_crtc, sizeof(struct amdgpu_vkms_output), GFP_KERNEL);
/* allocate crtcs, encoders, connectors */ for (i = 0; i < adev->mode_info.num_crtc; i++) { - r = dce_virtual_crtc_init(adev, i); - if (r) - return r; - r = dce_virtual_connector_encoder_init(adev, i); + r = amdgpu_vkms_output_init(adev_to_drm(adev), &adev->amdgpu_vkms_output[i], i); if (r) return r; } @@ -428,6 +432,7 @@ static int dce_virtual_sw_fini(void *handle) hrtimer_cancel(&adev->mode_info.crtcs[i]->vblank_timer);
kfree(adev->mode_info.bios_hardcoded_edid); + kfree(adev->amdgpu_vkms_output);
drm_kms_helper_poll_fini(adev_to_drm(adev));