[PATCH] drm/amdgpu: Reserve shared memory on VRAM for SR-IOV
Deucher, Alexander
Alexander.Deucher at amd.com
Fri Sep 29 13:01:44 UTC 2017
> -----Original Message-----
> From: Horace Chen [mailto:horace.chen at amd.com]
> Sent: Friday, September 29, 2017 3:21 AM
> To: amd-gfx at lists.freedesktop.org
> Cc: Deucher, Alexander; Chen, Horace
> Subject: [PATCH] drm/amdgpu: Reserve shared memory on VRAM for SR-
> IOV
>
> SR-IOV need to reserve a piece of shared VRAM at the exact place
> to exchange data betweem PF and VF. The start address and size of
> the shared mem are passed to guest through VBIOS structure
> VRAM_UsageByFirmware.
>
> VRAM_UsageByFirmware is a general feature in VBIOS, it indicates
> that VBIOS need to reserve a piece of memory on the VRAM.
>
> Because the mem address is specified. Reserve it early in
> amdgpu_ttm_init to make sure that it can monoplize the space.
>
> Signed-off-by: Horace Chen <horace.chen at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu.h | 14 +++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c | 18 +++++-
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 88
> ++++++++++++++++++++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 9 +++
> 4 files changed, 128 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index a5b0b67..b802858 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -1380,6 +1380,18 @@ struct amdgpu_atcs {
> };
>
> /*
> + * Firmware VRAM reservation
> + */
> +struct amdgpu_fw_vram_usage {
> + u64 start_offset;
> + u64 size;
> + struct amdgpu_bo *reserved_bo;
> + volatile uint32_t *va;
> +};
> +
> +int amdgpu_fw_reserve_vram_init(struct amdgpu_device *adev);
> +
> +/*
> * CGS
> */
> struct cgs_device *amdgpu_cgs_create_device(struct amdgpu_device
> *adev);
> @@ -1588,6 +1600,8 @@ struct amdgpu_device {
> struct delayed_work late_init_work;
>
> struct amdgpu_virt virt;
> + /* firmware VRAM reservation */
> + struct amdgpu_fw_vram_usage fw_vram_usage;
>
> /* link all shadow bo */
> struct list_head shadow_list;
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> index ce44358..f66d33e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
> @@ -1807,6 +1807,8 @@ int amdgpu_atombios_allocate_fb_scratch(struct
> amdgpu_device *adev)
> uint16_t data_offset;
> int usage_bytes = 0;
> struct _ATOM_VRAM_USAGE_BY_FIRMWARE *firmware_usage;
> + u64 start_addr;
> + u64 size;
>
> if (amdgpu_atom_parse_data_header(ctx, index, NULL, NULL, NULL,
> &data_offset)) {
> firmware_usage = (struct
> _ATOM_VRAM_USAGE_BY_FIRMWARE *)(ctx->bios + data_offset);
> @@ -1815,7 +1817,21 @@ int amdgpu_atombios_allocate_fb_scratch(struct
> amdgpu_device *adev)
> le32_to_cpu(firmware_usage-
> >asFirmwareVramReserveInfo[0].ulStartAddrUsedByFirmware),
> le16_to_cpu(firmware_usage-
> >asFirmwareVramReserveInfo[0].usFirmwareUseInKb));
>
> - usage_bytes = le16_to_cpu(firmware_usage-
> >asFirmwareVramReserveInfo[0].usFirmwareUseInKb) * 1024;
> + start_addr = firmware_usage-
> >asFirmwareVramReserveInfo[0].ulStartAddrUsedByFirmware;
> + size = firmware_usage-
> >asFirmwareVramReserveInfo[0].usFirmwareUseInKb;
> +
> + if ((uint32_t)(start_addr &
> ATOM_VRAM_OPERATION_FLAGS_MASK) ==
> +
> (uint32_t)(ATOM_VRAM_BLOCK_SRIOV_MSG_SHARE_RESERVATIO
> N <<
> + ATOM_VRAM_OPERATION_FLAGS_SHIFT)) {
> + /* Firmware request VRAM reservation for SR-IOV */
> + adev->fw_vram_usage.start_offset = (start_addr &
> +
> (~ATOM_VRAM_OPERATION_FLAGS_MASK)) << 10;
> + adev->fw_vram_usage.size = size << 10;
> + /* Use the default scratch size */
> + usage_bytes = 0;
> + } else {
> + usage_bytes = le16_to_cpu(firmware_usage-
> >asFirmwareVramReserveInfo[0].usFirmwareUseInKb) * 1024;
> + }
> }
> ctx->scratch_size_bytes = 0;
> if (usage_bytes == 0)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index a86d856..02e07a1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -658,6 +658,93 @@ void amdgpu_gart_location(struct amdgpu_device
> *adev, struct amdgpu_mc *mc)
> }
>
> /*
> + * Firmware Reservation function
> + */
> +/**
> + * amdgpu_fw_reserve_vram_fini - free fw reserved vram
> + *
> + * @adev: amdgpu_device pointer
> + *
> + * free fw reserved vram if it has been reserved.
> + */
> +void amdgpu_fw_reserve_vram_fini(struct amdgpu_device *adev)
> +{
> +
> + if (adev->fw_vram_usage.reserved_bo == NULL)
> + return;
> +
> + if (likely(amdgpu_bo_reserve(adev->fw_vram_usage.reserved_bo,
> + true) == 0)) {
> + amdgpu_bo_kunmap(adev->fw_vram_usage.reserved_bo);
> + amdgpu_bo_unpin(adev->fw_vram_usage.reserved_bo);
> + amdgpu_bo_unreserve(adev-
> >fw_vram_usage.reserved_bo);
> + }
> + amdgpu_bo_unref(&adev->fw_vram_usage.reserved_bo);
> +
> + adev->fw_vram_usage.va = NULL;
> + adev->fw_vram_usage.reserved_bo = NULL;
> +}
> +
> +/**
> + * amdgpu_fw_reserve_vram_init - create bo vram reservation from fw
> + *
> + * @adev: amdgpu_device pointer
> + *
> + * create bo vram reservation from fw.
> + */
> +int amdgpu_fw_reserve_vram_init(struct amdgpu_device *adev)
> +{
> + int r = 0;
> + u64 gpu_addr;
> + u64 vram_size = adev->mc.visible_vram_size;
> +
> + adev->fw_vram_usage.va = NULL;
> + adev->fw_vram_usage.reserved_bo = NULL;
> +
> + if (adev->fw_vram_usage.size > 0 &&
> + adev->fw_vram_usage.size <= vram_size) {
> +
> + r = amdgpu_bo_create(adev, adev->fw_vram_usage.size,
> + PAGE_SIZE, true, 0,
> + AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
> + AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS,
> NULL, NULL, 0,
> + &adev->fw_vram_usage.reserved_bo);
> + if (r)
> + goto error_create;
> +
> + r = amdgpu_bo_reserve(adev-
> >fw_vram_usage.reserved_bo, false);
> + if (r)
> + goto error_reserve;
> + r = amdgpu_bo_pin_restricted(adev-
> >fw_vram_usage.reserved_bo,
> + AMDGPU_GEM_DOMAIN_VRAM,
> + adev->fw_vram_usage.start_offset,
> + (adev->fw_vram_usage.start_offset +
> + adev->fw_vram_usage.size), &gpu_addr);
> + if (r)
> + goto error_pin;
> + r = amdgpu_bo_kmap(adev->fw_vram_usage.reserved_bo,
> + (void **)&adev->fw_vram_usage.va);
> + if (r)
> + goto error_kmap;
> +
> + amdgpu_bo_unreserve(adev-
> >fw_vram_usage.reserved_bo);
> + }
> + return r;
> +
> +error_kmap:
> + amdgpu_bo_unpin(adev->fw_vram_usage.reserved_bo);
> +error_pin:
> + amdgpu_bo_unreserve(adev->fw_vram_usage.reserved_bo);
> +error_reserve:
> + amdgpu_bo_unref(&adev->fw_vram_usage.reserved_bo);
> +error_create:
> + adev->fw_vram_usage.va = NULL;
> + adev->fw_vram_usage.reserved_bo = NULL;
> + return r;
> +}
> +
> +
> +/*
> * GPU helpers function.
> */
> /**
> @@ -2331,6 +2418,7 @@ void amdgpu_device_fini(struct amdgpu_device
> *adev)
> /* evict vram memory */
> amdgpu_bo_evict_vram(adev);
> amdgpu_ib_pool_fini(adev);
> + amdgpu_fw_reserve_vram_fini(adev);
> amdgpu_fence_driver_fini(adev);
> amdgpu_fbdev_fini(adev);
> r = amdgpu_fini(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 1086f03..a5253cf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -1256,6 +1256,15 @@ int amdgpu_ttm_init(struct amdgpu_device
> *adev)
> /* Change the size here instead of the init above so only lpfn is
> affected */
> amdgpu_ttm_set_active_vram_size(adev, adev-
> >mc.visible_vram_size);
>
> + /*
> + *The reserved vram for firmware must be pinned to the specified
> + *place on the VRAM, so reserve it early.
> + */
> + r = amdgpu_fw_reserve_vram_init(adev);
> + if (r) {
> + return r;
> + }
> +
> r = amdgpu_bo_create_kernel(adev, adev->mc.stolen_size,
> PAGE_SIZE,
> AMDGPU_GEM_DOMAIN_VRAM,
> &adev->stolen_vga_memory,
> --
> 2.7.4
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