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SubjectRe: [PATCH 02/83] drm/radeon: reduce number of free VMIDs and pipes in KV
On Fri, Jul 11, 2014 at 12:50:02AM +0300, Oded Gabbay wrote:
> To support HSA on KV, we need to limit the number of vmids and pipes
> that are available for radeon's use with KV.
>
> This patch reserves VMIDs 8-15 for KFD (so radeon can only use VMIDs
> 0-7) and also makes radeon thinks that KV has only a single MEC with a single
> pipe in it
>
> Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>

Reviewed-by: Jérôme Glisse <jglisse@redhat.com>

> ---
> drivers/gpu/drm/radeon/cik.c | 48 ++++++++++++++++++++++----------------------
> 1 file changed, 24 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
> index 4bfc2c0..e0c8052 100644
> --- a/drivers/gpu/drm/radeon/cik.c
> +++ b/drivers/gpu/drm/radeon/cik.c
> @@ -4662,12 +4662,11 @@ static int cik_mec_init(struct radeon_device *rdev)
> /*
> * KV: 2 MEC, 4 Pipes/MEC, 8 Queues/Pipe - 64 Queues total
> * CI/KB: 1 MEC, 4 Pipes/MEC, 8 Queues/Pipe - 32 Queues total
> + * Nonetheless, we assign only 1 pipe because all other pipes will
> + * be handled by KFD
> */
> - if (rdev->family == CHIP_KAVERI)
> - rdev->mec.num_mec = 2;
> - else
> - rdev->mec.num_mec = 1;
> - rdev->mec.num_pipe = 4;
> + rdev->mec.num_mec = 1;
> + rdev->mec.num_pipe = 1;
> rdev->mec.num_queue = rdev->mec.num_mec * rdev->mec.num_pipe * 8;
>
> if (rdev->mec.hpd_eop_obj == NULL) {
> @@ -4809,28 +4808,24 @@ static int cik_cp_compute_resume(struct radeon_device *rdev)
>
> /* init the pipes */
> mutex_lock(&rdev->srbm_mutex);
> - for (i = 0; i < (rdev->mec.num_pipe * rdev->mec.num_mec); i++) {
> - int me = (i < 4) ? 1 : 2;
> - int pipe = (i < 4) ? i : (i - 4);
>
> - eop_gpu_addr = rdev->mec.hpd_eop_gpu_addr + (i * MEC_HPD_SIZE * 2);
> + eop_gpu_addr = rdev->mec.hpd_eop_gpu_addr;
>
> - cik_srbm_select(rdev, me, pipe, 0, 0);
> + cik_srbm_select(rdev, 0, 0, 0, 0);
>
> - /* write the EOP addr */
> - WREG32(CP_HPD_EOP_BASE_ADDR, eop_gpu_addr >> 8);
> - WREG32(CP_HPD_EOP_BASE_ADDR_HI, upper_32_bits(eop_gpu_addr) >> 8);
> + /* write the EOP addr */
> + WREG32(CP_HPD_EOP_BASE_ADDR, eop_gpu_addr >> 8);
> + WREG32(CP_HPD_EOP_BASE_ADDR_HI, upper_32_bits(eop_gpu_addr) >> 8);
>
> - /* set the VMID assigned */
> - WREG32(CP_HPD_EOP_VMID, 0);
> + /* set the VMID assigned */
> + WREG32(CP_HPD_EOP_VMID, 0);
> +
> + /* set the EOP size, register value is 2^(EOP_SIZE+1) dwords */
> + tmp = RREG32(CP_HPD_EOP_CONTROL);
> + tmp &= ~EOP_SIZE_MASK;
> + tmp |= order_base_2(MEC_HPD_SIZE / 8);
> + WREG32(CP_HPD_EOP_CONTROL, tmp);
>
> - /* set the EOP size, register value is 2^(EOP_SIZE+1) dwords */
> - tmp = RREG32(CP_HPD_EOP_CONTROL);
> - tmp &= ~EOP_SIZE_MASK;
> - tmp |= order_base_2(MEC_HPD_SIZE / 8);
> - WREG32(CP_HPD_EOP_CONTROL, tmp);
> - }
> - cik_srbm_select(rdev, 0, 0, 0, 0);
> mutex_unlock(&rdev->srbm_mutex);
>
> /* init the queues. Just two for now. */
> @@ -5876,8 +5871,13 @@ int cik_ib_parse(struct radeon_device *rdev, struct radeon_ib *ib)
> */
> int cik_vm_init(struct radeon_device *rdev)
> {
> - /* number of VMs */
> - rdev->vm_manager.nvm = 16;
> + /*
> + * number of VMs
> + * VMID 0 is reserved for Graphics
> + * radeon compute will use VMIDs 1-7
> + * KFD will use VMIDs 8-15
> + */
> + rdev->vm_manager.nvm = 8;
> /* base offset of vram pages */
> if (rdev->flags & RADEON_IS_IGP) {
> u64 tmp = RREG32(MC_VM_FB_OFFSET);
> --
> 1.9.1
>
--
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