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// SPDX-License-Identifier: GPL-2.0
/*
* GXP IOMMU domain allocator.
*
* Copyright (C) 2022 Google LLC
*/
#include <linux/iommu.h>
#include <linux/slab.h>
#include <gcip/gcip-domain-pool.h>
#include "gxp-dma.h"
#include "gxp-domain-pool.h"
int gxp_domain_pool_init(struct gxp_dev *gxp, struct gcip_domain_pool *pool,
unsigned int size)
{
int ret = gcip_domain_pool_init(gxp->dev, pool, size);
__maybe_unused int i;
if (ret)
return ret;
#if IS_ENABLED(CONFIG_GXP_GEM5)
for (i = 0; i < size; i++) {
struct iommu_domain *domain = pool->array[i];
/*
* Gem5 uses arm-smmu-v3 which requires domain finalization to do iommu map. Calling
* iommu_aux_attach_device to finalize the allocated domain and detach the device
* right after that.
*/
ret = iommu_aux_attach_device(domain, gxp->dev);
if (ret) {
dev_err(gxp->dev,
"Failed to attach device to iommu domain %d of %u, ret=%d\n",
i + 1, size, ret);
gxp_domain_pool_destroy(pool);
return ret;
}
iommu_aux_detach_device(domain, gxp->dev);
}
#endif /* CONFIG_GXP_GEM5 */
return 0;
}
struct gxp_iommu_domain *gxp_domain_pool_alloc(struct gcip_domain_pool *pool)
{
struct iommu_domain *domain = gcip_domain_pool_alloc(pool);
struct gxp_iommu_domain *gdomain;
if (!domain)
return NULL;
gdomain = kmalloc(sizeof(*gdomain), GFP_KERNEL);
if (!gdomain) {
gcip_domain_pool_free(pool, domain);
return NULL;
}
gdomain->domain = domain;
return gdomain;
}
void gxp_domain_pool_free(struct gcip_domain_pool *pool,
struct gxp_iommu_domain *gdomain)
{
gcip_domain_pool_free(pool, gdomain->domain);
kfree(gdomain);
}
void gxp_domain_pool_destroy(struct gcip_domain_pool *pool)
{
gcip_domain_pool_destroy(pool);
}
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