/*
* Copyright ( c ) 2011 - 2016 Intel Corporation . All rights reserved .
*
* 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 ( including the next
* paragraph ) 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 AUTHORS OR COPYRIGHT HOLDERS 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 .
*
* Authors :
* Kevin Tian < kevin . tian @ intel . com >
* Dexuan Cui
*
* Contributors :
* Pei Zhang < pei . zhang @ intel . com >
* Min He < min . he @ intel . com >
* Niu Bing < bing . niu @ intel . com >
* Yulei Zhang < yulei . zhang @ intel . com >
* Zhenyu Wang < zhenyuw @ linux . intel . com >
* Zhi Wang < zhi . a . wang @ intel . com >
*
*/
#include "i915_drv.h"
#include "i915_reg.h"
#include "gt/intel_ggtt_fencing.h"
#include "gvt.h"
static int alloc_gm(struct intel_vgpu *vgpu, bool high_gm)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_gt *gt = gvt->gt;
unsigned int flags;
u64 start, end, size;
struct drm_mm_node *node;
intel_wakeref_t wakeref;
int ret;
if (high_gm) {
node = &vgpu->gm.high_gm_node;
size = vgpu_hidden_sz(vgpu);
start = ALIGN(gvt_hidden_gmadr_base(gvt), I915_GTT_PAGE_SIZE);
end = ALIGN(gvt_hidden_gmadr_end(gvt), I915_GTT_PAGE_SIZE);
flags = PIN_HIGH;
} else {
node = &vgpu->gm.low_gm_node;
size = vgpu_aperture_sz(vgpu);
start = ALIGN(gvt_aperture_gmadr_base(gvt), I915_GTT_PAGE_SIZE);
end = ALIGN(gvt_aperture_gmadr_end(gvt), I915_GTT_PAGE_SIZE);
flags = PIN_MAPPABLE;
}
mutex_lock(>->ggtt->vm.mutex);
wakeref = mmio_hw_access_pre(gt);
ret = i915_gem_gtt_insert(>->ggtt->vm, NULL, node,
size, I915_GTT_PAGE_SIZE,
I915_COLOR_UNEVICTABLE,
start, end, flags);
mmio_hw_access_post(gt, wakeref);
mutex_unlock(>->ggtt->vm.mutex);
if (ret)
gvt_err("fail to alloc %s gm space from host\n" ,
high_gm ? "high" : "low" );
return ret;
}
static int alloc_vgpu_gm(struct intel_vgpu *vgpu)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_gt *gt = gvt->gt;
int ret;
ret = alloc_gm(vgpu, false );
if (ret)
return ret;
ret = alloc_gm(vgpu, true );
if (ret)
goto out_free_aperture;
gvt_dbg_core("vgpu%d: alloc low GM start %llx size %llx\n" , vgpu->id,
vgpu_aperture_offset(vgpu), vgpu_aperture_sz(vgpu));
gvt_dbg_core("vgpu%d: alloc high GM start %llx size %llx\n" , vgpu->id,
vgpu_hidden_offset(vgpu), vgpu_hidden_sz(vgpu));
return 0 ;
out_free_aperture:
mutex_lock(>->ggtt->vm.mutex);
drm_mm_remove_node(&vgpu->gm.low_gm_node);
mutex_unlock(>->ggtt->vm.mutex);
return ret;
}
static void free_vgpu_gm(struct intel_vgpu *vgpu)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_gt *gt = gvt->gt;
mutex_lock(>->ggtt->vm.mutex);
drm_mm_remove_node(&vgpu->gm.low_gm_node);
drm_mm_remove_node(&vgpu->gm.high_gm_node);
mutex_unlock(>->ggtt->vm.mutex);
}
/**
* intel_vgpu_write_fence - write fence registers owned by a vGPU
* @ vgpu : vGPU instance
* @ fence : vGPU fence register number
* @ value : Fence register value to be written
*
* This function is used to write fence registers owned by a vGPU . The vGPU
* fence register number will be translated into HW fence register number .
*
*/
void intel_vgpu_write_fence(struct intel_vgpu *vgpu,
u32 fence, u64 value)
{
struct intel_gvt *gvt = vgpu->gvt;
struct drm_i915_private *i915 = gvt->gt->i915;
struct intel_uncore *uncore = gvt->gt->uncore;
struct i915_fence_reg *reg;
i915_reg_t fence_reg_lo, fence_reg_hi;
assert_rpm_wakelock_held(uncore->rpm);
if (drm_WARN_ON(&i915->drm, fence >= vgpu_fence_sz(vgpu)))
return ;
reg = vgpu->fence.regs[fence];
if (drm_WARN_ON(&i915->drm, !reg))
return ;
fence_reg_lo = FENCE_REG_GEN6_LO(reg->id);
fence_reg_hi = FENCE_REG_GEN6_HI(reg->id);
intel_uncore_write(uncore, fence_reg_lo, 0 );
intel_uncore_posting_read(uncore, fence_reg_lo);
intel_uncore_write(uncore, fence_reg_hi, upper_32_bits(value));
intel_uncore_write(uncore, fence_reg_lo, lower_32_bits(value));
intel_uncore_posting_read(uncore, fence_reg_lo);
}
static void _clear_vgpu_fence(struct intel_vgpu *vgpu)
{
int i;
for (i = 0 ; i < vgpu_fence_sz(vgpu); i++)
intel_vgpu_write_fence(vgpu, i, 0 );
}
static void free_vgpu_fence(struct intel_vgpu *vgpu)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_uncore *uncore = gvt->gt->uncore;
struct i915_fence_reg *reg;
intel_wakeref_t wakeref;
u32 i;
if (drm_WARN_ON(&gvt->gt->i915->drm, !vgpu_fence_sz(vgpu)))
return ;
wakeref = intel_runtime_pm_get(uncore->rpm);
mutex_lock(&gvt->gt->ggtt->vm.mutex);
_clear_vgpu_fence(vgpu);
for (i = 0 ; i < vgpu_fence_sz(vgpu); i++) {
reg = vgpu->fence.regs[i];
i915_unreserve_fence(reg);
vgpu->fence.regs[i] = NULL;
}
mutex_unlock(&gvt->gt->ggtt->vm.mutex);
intel_runtime_pm_put(uncore->rpm, wakeref);
}
static int alloc_vgpu_fence(struct intel_vgpu *vgpu)
{
struct intel_gvt *gvt = vgpu->gvt;
struct intel_uncore *uncore = gvt->gt->uncore;
struct i915_fence_reg *reg;
intel_wakeref_t wakeref;
int i;
wakeref = intel_runtime_pm_get(uncore->rpm);
/* Request fences from host */
mutex_lock(&gvt->gt->ggtt->vm.mutex);
for (i = 0 ; i < vgpu_fence_sz(vgpu); i++) {
reg = i915_reserve_fence(gvt->gt->ggtt);
if (IS_ERR(reg))
goto out_free_fence;
vgpu->fence.regs[i] = reg;
}
_clear_vgpu_fence(vgpu);
mutex_unlock(&gvt->gt->ggtt->vm.mutex);
intel_runtime_pm_put(uncore->rpm, wakeref);
return 0 ;
out_free_fence:
gvt_vgpu_err("Failed to alloc fences\n" );
/* Return fences to host, if fail */
for (i = 0 ; i < vgpu_fence_sz(vgpu); i++) {
reg = vgpu->fence.regs[i];
if (!reg)
continue ;
i915_unreserve_fence(reg);
vgpu->fence.regs[i] = NULL;
}
mutex_unlock(&gvt->gt->ggtt->vm.mutex);
intel_runtime_pm_put(uncore->rpm, wakeref);
return -ENOSPC;
}
static void free_resource(struct intel_vgpu *vgpu)
{
struct intel_gvt *gvt = vgpu->gvt;
gvt->gm.vgpu_allocated_low_gm_size -= vgpu_aperture_sz(vgpu);
gvt->gm.vgpu_allocated_high_gm_size -= vgpu_hidden_sz(vgpu);
gvt->fence.vgpu_allocated_fence_num -= vgpu_fence_sz(vgpu);
}
static int alloc_resource(struct intel_vgpu *vgpu,
const struct intel_vgpu_config *conf)
{
struct intel_gvt *gvt = vgpu->gvt;
unsigned long request, avail, max, taken;
const char *item;
if (!conf->low_mm || !conf->high_mm || !conf->fence) {
gvt_vgpu_err("Invalid vGPU creation params\n" );
return -EINVAL;
}
item = "low GM space" ;
max = gvt_aperture_sz(gvt) - HOST_LOW_GM_SIZE;
taken = gvt->gm.vgpu_allocated_low_gm_size;
avail = max - taken;
request = conf->low_mm;
if (request > avail)
goto no_enough_resource;
vgpu_aperture_sz(vgpu) = ALIGN(request, I915_GTT_PAGE_SIZE);
item = "high GM space" ;
max = gvt_hidden_sz(gvt) - HOST_HIGH_GM_SIZE;
taken = gvt->gm.vgpu_allocated_high_gm_size;
avail = max - taken;
request = conf->high_mm;
if (request > avail)
goto no_enough_resource;
vgpu_hidden_sz(vgpu) = ALIGN(request, I915_GTT_PAGE_SIZE);
item = "fence" ;
max = gvt_fence_sz(gvt) - HOST_FENCE;
taken = gvt->fence.vgpu_allocated_fence_num;
avail = max - taken;
request = conf->fence;
if (request > avail)
goto no_enough_resource;
vgpu_fence_sz(vgpu) = request;
gvt->gm.vgpu_allocated_low_gm_size += conf->low_mm;
gvt->gm.vgpu_allocated_high_gm_size += conf->high_mm;
gvt->fence.vgpu_allocated_fence_num += conf->fence;
return 0 ;
no_enough_resource:
gvt_err("fail to allocate resource %s\n" , item);
gvt_err("request %luMB avail %luMB max %luMB taken %luMB\n" ,
BYTES_TO_MB(request), BYTES_TO_MB(avail),
BYTES_TO_MB(max), BYTES_TO_MB(taken));
return -ENOSPC;
}
/**
* intel_vgpu_free_resource ( ) - free HW resource owned by a vGPU
* @ vgpu : a vGPU
*
* This function is used to free the HW resource owned by a vGPU .
*
*/
void intel_vgpu_free_resource(struct intel_vgpu *vgpu)
{
free_vgpu_gm(vgpu);
free_vgpu_fence(vgpu);
free_resource(vgpu);
}
/**
* intel_vgpu_reset_resource - reset resource state owned by a vGPU
* @ vgpu : a vGPU
*
* This function is used to reset resource state owned by a vGPU .
*
*/
void intel_vgpu_reset_resource(struct intel_vgpu *vgpu)
{
struct intel_gvt *gvt = vgpu->gvt;
intel_wakeref_t wakeref;
with_intel_runtime_pm(gvt->gt->uncore->rpm, wakeref)
_clear_vgpu_fence(vgpu);
}
/**
* intel_vgpu_alloc_resource ( ) - allocate HW resource for a vGPU
* @ vgpu : vGPU
* @ conf : vGPU creation params
*
* This function is used to allocate HW resource for a vGPU . User specifies
* the resource configuration through the creation params .
*
* Returns :
* zero on success , negative error code if failed .
*
*/
int intel_vgpu_alloc_resource(struct intel_vgpu *vgpu,
const struct intel_vgpu_config *conf)
{
int ret;
ret = alloc_resource(vgpu, conf);
if (ret)
return ret;
ret = alloc_vgpu_gm(vgpu);
if (ret)
goto out_free_resource;
ret = alloc_vgpu_fence(vgpu);
if (ret)
goto out_free_vgpu_gm;
return 0 ;
out_free_vgpu_gm:
free_vgpu_gm(vgpu);
out_free_resource:
free_resource(vgpu);
return ret;
}
Messung V0.5 in Prozent C=99 H=81 G=90
¤ Dauer der Verarbeitung: 0.13 Sekunden
(vorverarbeitet am 2026-10-03)
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