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/*
*
* (C) COPYRIGHT 2017 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* http://www.gnu.org/licenses/gpl-2.0.html.
*
* SPDX-License-Identifier: GPL-2.0
*
*/
#include <mali_kbase.h>
#include <mali_kbase_config_defaults.h>
#include "mali_kbase_ctx_sched.h"
int kbase_ctx_sched_init(struct kbase_device *kbdev)
{
int as_present = (1U << kbdev->nr_hw_address_spaces) - 1;
/* These two must be recalculated if nr_hw_address_spaces changes
* (e.g. for HW workarounds) */
kbdev->nr_user_address_spaces = kbdev->nr_hw_address_spaces;
if (kbase_hw_has_issue(kbdev, BASE_HW_ISSUE_8987)) {
bool use_workaround;
use_workaround = DEFAULT_SECURE_BUT_LOSS_OF_PERFORMANCE;
if (use_workaround) {
dev_dbg(kbdev->dev, "GPU has HW ISSUE 8987, and driver configured for security workaround: 1 address space only");
kbdev->nr_user_address_spaces = 1;
}
}
kbdev->as_free = as_present; /* All ASs initially free */
memset(kbdev->as_to_kctx, 0, sizeof(kbdev->as_to_kctx));
return 0;
}
void kbase_ctx_sched_term(struct kbase_device *kbdev)
{
s8 i;
/* Sanity checks */
for (i = 0; i != kbdev->nr_hw_address_spaces; ++i) {
WARN_ON(kbdev->as_to_kctx[i] != NULL);
WARN_ON(!(kbdev->as_free & (1u << i)));
}
}
/* kbasep_ctx_sched_find_as_for_ctx - Find a free address space
*
* @kbdev: The context for which to find a free address space
*
* Return: A valid AS if successful, otherwise KBASEP_AS_NR_INVALID
*
* This function returns an address space available for use. It would prefer
* returning an AS that has been previously assigned to the context to
* avoid having to reprogram the MMU.
*/
static int kbasep_ctx_sched_find_as_for_ctx(struct kbase_context *kctx)
{
struct kbase_device *const kbdev = kctx->kbdev;
int free_as;
lockdep_assert_held(&kbdev->hwaccess_lock);
/* First check if the previously assigned AS is available */
if ((kctx->as_nr != KBASEP_AS_NR_INVALID) &&
(kbdev->as_free & (1u << kctx->as_nr)))
return kctx->as_nr;
/* The previously assigned AS was taken, we'll be returning any free
* AS at this point.
*/
free_as = ffs(kbdev->as_free) - 1;
if (free_as >= 0 && free_as < kbdev->nr_hw_address_spaces)
return free_as;
return KBASEP_AS_NR_INVALID;
}
int kbase_ctx_sched_retain_ctx(struct kbase_context *kctx)
{
struct kbase_device *const kbdev = kctx->kbdev;
lockdep_assert_held(&kbdev->mmu_hw_mutex);
lockdep_assert_held(&kbdev->hwaccess_lock);
WARN_ON(!kbdev->pm.backend.gpu_powered);
if (atomic_inc_return(&kctx->refcount) == 1) {
int const free_as = kbasep_ctx_sched_find_as_for_ctx(kctx);
if (free_as != KBASEP_AS_NR_INVALID) {
kbdev->as_free &= ~(1u << free_as);
/* Only program the MMU if the context has not been
* assigned the same address space before.
*/
if (free_as != kctx->as_nr) {
struct kbase_context *const prev_kctx =
kbdev->as_to_kctx[free_as];
if (prev_kctx) {
WARN_ON(atomic_read(&prev_kctx->refcount) != 0);
kbase_mmu_disable(prev_kctx);
prev_kctx->as_nr = KBASEP_AS_NR_INVALID;
}
kctx->as_nr = free_as;
kbdev->as_to_kctx[free_as] = kctx;
kbase_mmu_update(kctx);
}
} else {
atomic_dec(&kctx->refcount);
/* Failed to find an available address space, we must
* be returning an error at this point.
*/
WARN_ON(kctx->as_nr != KBASEP_AS_NR_INVALID);
}
}
return kctx->as_nr;
}
void kbase_ctx_sched_retain_ctx_refcount(struct kbase_context *kctx)
{
struct kbase_device *const kbdev = kctx->kbdev;
lockdep_assert_held(&kbdev->hwaccess_lock);
WARN_ON(atomic_read(&kctx->refcount) == 0);
WARN_ON(kctx->as_nr == KBASEP_AS_NR_INVALID);
WARN_ON(kbdev->as_to_kctx[kctx->as_nr] != kctx);
atomic_inc(&kctx->refcount);
}
void kbase_ctx_sched_release_ctx(struct kbase_context *kctx)
{
struct kbase_device *const kbdev = kctx->kbdev;
lockdep_assert_held(&kbdev->hwaccess_lock);
if (atomic_dec_return(&kctx->refcount) == 0)
kbdev->as_free |= (1u << kctx->as_nr);
}
void kbase_ctx_sched_remove_ctx(struct kbase_context *kctx)
{
struct kbase_device *const kbdev = kctx->kbdev;
lockdep_assert_held(&kbdev->mmu_hw_mutex);
lockdep_assert_held(&kbdev->hwaccess_lock);
WARN_ON(atomic_read(&kctx->refcount) != 0);
if (kctx->as_nr != KBASEP_AS_NR_INVALID) {
if (kbdev->pm.backend.gpu_powered)
kbase_mmu_disable(kctx);
kbdev->as_to_kctx[kctx->as_nr] = NULL;
kctx->as_nr = KBASEP_AS_NR_INVALID;
}
}
void kbase_ctx_sched_restore_all_as(struct kbase_device *kbdev)
{
s8 i;
lockdep_assert_held(&kbdev->mmu_hw_mutex);
lockdep_assert_held(&kbdev->hwaccess_lock);
WARN_ON(!kbdev->pm.backend.gpu_powered);
for (i = 0; i != kbdev->nr_hw_address_spaces; ++i) {
struct kbase_context *kctx;
kctx = kbdev->as_to_kctx[i];
if (kctx) {
if (atomic_read(&kctx->refcount)) {
WARN_ON(kctx->as_nr != i);
kbase_mmu_update(kctx);
} else {
/* This context might have been assigned an
* AS before, clear it.
*/
kbdev->as_to_kctx[kctx->as_nr] = NULL;
kctx->as_nr = KBASEP_AS_NR_INVALID;
}
} else {
kbase_mmu_disable_as(kbdev, i);
}
}
}
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