/*
* Copyright 2014 Advanced Micro Devices, Inc.
* Copyright 2008 Red Hat Inc.
* Copyright 2009 Jerome Glisse.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_gfx.h"
/*
* GPU scratch registers helpers function.
*/
/**
* amdgpu_gfx_scratch_get - Allocate a scratch register
*
* @adev: amdgpu_device pointer
* @reg: scratch register mmio offset
*
* Allocate a CP scratch register for use by the driver (all asics).
* Returns 0 on success or -EINVAL on failure.
*/
int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg)
{
int i;
i = ffs(adev->gfx.scratch.free_mask);
if (i != 0 && i <= adev->gfx.scratch.num_reg) {
i--;
adev->gfx.scratch.free_mask &= ~(1u << i);
*reg = adev->gfx.scratch.reg_base + i;
return 0;
}
return -EINVAL;
}
/**
* amdgpu_gfx_scratch_free - Free a scratch register
*
* @adev: amdgpu_device pointer
* @reg: scratch register mmio offset
*
* Free a CP scratch register allocated for use by the driver (all asics)
*/
void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg)
{
adev->gfx.scratch.free_mask |= 1u << (reg - adev->gfx.scratch.reg_base);
}
/**
* amdgpu_gfx_parse_disable_cu - Parse the disable_cu module parameter
*
* @mask: array in which the per-shader array disable masks will be stored
* @max_se: number of SEs
* @max_sh: number of SHs
*
* The bitmask of CUs to be disabled in the shader array determined by se and
* sh is stored in mask[se * max_sh + sh].
*/
void amdgpu_gfx_parse_disable_cu(unsigned *mask, unsigned max_se, unsigned max_sh)
{
unsigned se, sh, cu;
const char *p;
memset(mask, 0, sizeof(*mask) * max_se * max_sh);
if (!amdgpu_disable_cu || !*amdgpu_disable_cu)
return;
p = amdgpu_disable_cu;
for (;;) {
char *next;
int ret = sscanf(p, "%u.%u.%u", &se, &sh, &cu);
if (ret < 3) {
DRM_ERROR("amdgpu: could not parse disable_cu\n");
return;
}
if (se < max_se && sh < max_sh && cu < 16) {
DRM_INFO("amdgpu: disabling CU %u.%u.%u\n", se, sh, cu);
mask[se * max_sh + sh] |= 1u << cu;
} else {
DRM_ERROR("amdgpu: disable_cu %u.%u.%u is out of range\n",
se, sh, cu);
}
next = strchr(p, ',');
if (!next)
break;
p = next + 1;
}
}
void amdgpu_gfx_compute_queue_acquire(struct amdgpu_device *adev)
{
int i, queue, pipe, mec;
/* policy for amdgpu compute queue ownership */
for (i = 0; i < AMDGPU_MAX_COMPUTE_QUEUES; ++i) {
queue = i % adev->gfx.mec.num_queue_per_pipe;
pipe = (i / adev->gfx.mec.num_queue_per_pipe)
% adev->gfx.mec.num_pipe_per_mec;
mec = (i / adev->gfx.mec.num_queue_per_pipe)
/ adev->gfx.mec.num_pipe_per_mec;
/* we've run out of HW */
if (mec >= adev->gfx.mec.num_mec)
break;
/* FIXME: spreading the queues across pipes causes perf regressions */
if (0) {
/* policy: amdgpu owns the first two queues of the first MEC */
if (mec == 0 && queue < 2)
set_bit(i, adev->gfx.mec.queue_bitmap);
} else {
/* policy: amdgpu owns all queues in the first pipe */
if (mec == 0 && pipe == 0)
set_bit(i, adev->gfx.mec.queue_bitmap);
}
}
/* update the number of active compute rings */
adev->gfx.num_compute_rings =
bitmap_weight(adev->gfx.mec.queue_bitmap, AMDGPU_MAX_COMPUTE_QUEUES);
/* If you hit this case and edited the policy, you probably just
* need to increase AMDGPU_MAX_COMPUTE_RINGS */
if (WARN_ON(adev->gfx.num_compute_rings > AMDGPU_MAX_COMPUTE_RINGS))
adev->gfx.num_compute_rings = AMDGPU_MAX_COMPUTE_RINGS;
}
static int amdgpu_gfx_kiq_acquire(struct amdgpu_device *adev,
struct amdgpu_ring *ring)
{
int queue_bit;
int mec, pipe, queue;
queue_bit = adev->gfx.mec.num_mec
* adev->gfx.mec.num_pipe_per_mec
* adev->gfx.mec.num_queue_per_pipe;
while (queue_bit-- >= 0) {
if (test_bit(queue_bit, adev->gfx.mec.queue_bitmap))
continue;
amdgpu_gfx_bit_to_queue(adev, queue_bit, &mec, &pipe, &queue);
/* Using pipes 2/3 from MEC 2 seems cause problems */
if (mec == 1 && pipe > 1)
continue;
ring->me = mec + 1;
ring->pipe = pipe;
ring->queue = queue;
return 0;
}
dev_err(adev->dev, "Failed to find a queue for KIQ\n");
return -EINVAL;
}
int amdgpu_gfx_kiq_init_ring(struct amdgpu_device *adev,
struct amdgpu_ring *ring,
struct amdgpu_irq_src *irq)
{
struct amdgpu_kiq *kiq = &adev->gfx.kiq;
int r = 0;
mutex_init(&kiq->ring_mutex);
r = amdgpu_wb_get(adev, &adev->virt.reg_val_offs);
if (r)
return r;
ring->adev = NULL;
ring->ring_obj = NULL;
ring->use_doorbell = true;
ring->doorbell_index = AMDGPU_DOORBELL_KIQ;
r = amdgpu_gfx_kiq_acquire(adev, ring);
if (r)
return r;
ring->eop_gpu_addr = kiq->eop_gpu_addr;
sprintf(ring->name, "kiq_%d.%d.%d", ring->me, ring->pipe, ring->queue);
r = amdgpu_ring_init(adev, ring, 1024,
irq, AMDGPU_CP_KIQ_IRQ_DRIVER0);
if (r)
dev_warn(adev->dev, "(%d) failed to init kiq ring\n", r);
return r;
}
void amdgpu_gfx_kiq_free_ring(struct amdgpu_ring *ring,
struct amdgpu_irq_src *irq)
{
amdgpu_wb_free(ring->adev, ring->adev->virt.reg_val_offs);
amdgpu_ring_fini(ring);
}
void amdgpu_gfx_kiq_fini(struct amdgpu_device *adev)
{
struct amdgpu_kiq *kiq = &adev->gfx.kiq;
amdgpu_bo_free_kernel(&kiq->eop_obj, &kiq->eop_gpu_addr, NULL);
}
int amdgpu_gfx_kiq_init(struct amdgpu_device *adev,
unsigned hpd_size)
{
int r;
u32 *hpd;
struct amdgpu_kiq *kiq = &adev->gfx.kiq;
r = amdgpu_bo_create_kernel(adev, hpd_size, PAGE_SIZE,
AMDGPU_GEM_DOMAIN_GTT, &kiq->eop_obj,
&kiq->eop_gpu_addr, (void **)&hpd);
if (r) {
dev_warn(adev->dev, "failed to create KIQ bo (%d).\n", r);
return r;
}
memset(hpd, 0, hpd_size);
r = amdgpu_bo_reserve(kiq->eop_obj, true);
if (unlikely(r != 0))
dev_warn(adev->dev, "(%d) reserve kiq eop bo failed\n", r);
amdgpu_bo_kunmap(kiq->eop_obj);
amdgpu_bo_unreserve(kiq->eop_obj);
return 0;
}
/* create MQD for each compute queue */
int amdgpu_gfx_compute_mqd_sw_init(struct amdgpu_device *adev,
unsigned mqd_size)
{
struct amdgpu_ring *ring = NULL;
int r, i;
/* create MQD for KIQ */
ring = &adev->gfx.kiq.ring;
if (!ring->mqd_obj) {
r = amdgpu_bo_create_kernel(adev, mqd_size, PAGE_SIZE,
AMDGPU_GEM_DOMAIN_GTT, &ring->mqd_obj,
&ring->mqd_gpu_addr, &ring->mqd_ptr);
if (r) {
dev_warn(adev->dev, "failed to create ring mqd ob (%d)", r);
return r;
}
/* prepare MQD backup */
adev->gfx.mec.mqd_backup[AMDGPU_MAX_COMPUTE_RINGS] = kmalloc(mqd_size, GFP_KERNEL);
if (!adev->gfx.mec.mqd_backup[AMDGPU_MAX_COMPUTE_RINGS])
dev_warn(adev->dev, "no memory to create MQD backup for ring %s\n", ring->name);
}
/* create MQD for each KCQ */
for (i = 0; i < adev->gfx.num_compute_rings; i++) {
ring = &adev->gfx.compute_ring[i];
if (!ring->mqd_obj) {
r = amdgpu_bo_create_kernel(adev, mqd_size, PAGE_SIZE,
AMDGPU_GEM_DOMAIN_GTT, &ring->mqd_obj,
&ring->mqd_gpu_addr, &ring->mqd_ptr);
if (r) {
dev_warn(adev->dev, "failed to create ring mqd ob (%d)", r);
return r;
}
/* prepare MQD backup */
adev->gfx.mec.mqd_backup[i] = kmalloc(mqd_size, GFP_KERNEL);
if (!adev->gfx.mec.mqd_backup[i])
dev_warn(adev->dev, "no memory to create MQD backup for ring %s\n", ring->name);
}
}
return 0;
}
void amdgpu_gfx_compute_mqd_sw_fini(struct amdgpu_device *adev)
{
struct amdgpu_ring *ring = NULL;
int i;
for (i = 0; i < adev->gfx.num_compute_rings; i++) {
ring = &adev->gfx.compute_ring[i];
kfree(adev->gfx.mec.mqd_backup[i]);
amdgpu_bo_free_kernel(&ring->mqd_obj,
&ring->mqd_gpu_addr,
&ring->mqd_ptr);
}
ring = &adev->gfx.kiq.ring;
kfree(adev->gfx.mec.mqd_backup[AMDGPU_MAX_COMPUTE_RINGS]);
amdgpu_bo_free_kernel(&ring->mqd_obj,
&ring->mqd_gpu_addr,
&ring->mqd_ptr);
}
