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iommu/fsl_pamu: Implement a PLATFORM domain

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This driver is nonsensical. To not block migrating the core API away from
NULL default_domains give it a hacky of a PLATFORM domain that keeps it
working exactly as it always did.

Leave some comments around to warn away any future people looking at this.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/5-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2023-09-13 10:43:38 -03:00 committed by Joerg Roedel
parent e04c7487a6
commit 8565915e75
1 changed files with 38 additions and 3 deletions
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41
drivers/iommu/fsl_pamu_domain.c
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@ -196,6 +196,13 @@ static struct iommu_domain *fsl_pamu_domain_alloc(unsigned type)
{
struct fsl_dma_domain *dma_domain;
/*
* FIXME: This isn't creating an unmanaged domain since the
* default_domain_ops do not have any map/unmap function it doesn't meet
* the requirements for __IOMMU_DOMAIN_PAGING. The only purpose seems to
* allow drivers/soc/fsl/qbman/qman_portal.c to do
* fsl_pamu_configure_l1_stash()
*/
if (type != IOMMU_DOMAIN_UNMANAGED)
return NULL;
@ -283,15 +290,33 @@ static int fsl_pamu_attach_device(struct iommu_domain *domain,
return ret;
}
static void fsl_pamu_set_platform_dma(struct device *dev)
/*
* FIXME: fsl/pamu is completely broken in terms of how it works with the iommu
* API. Immediately after probe the HW is left in an IDENTITY translation and
* the driver provides a non-working UNMANAGED domain that it can switch over
* to. However it cannot switch back to an IDENTITY translation, instead it
* switches to what looks like BLOCKING.
*/
static int fsl_pamu_platform_attach(struct iommu_domain *platform_domain,
struct device *dev)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
struct fsl_dma_domain *dma_domain;
const u32 *prop;
int len;
struct pci_dev *pdev = NULL;
struct pci_controller *pci_ctl;
/*
* Hack to keep things working as they always have, only leaving an
* UNMANAGED domain makes it BLOCKING.
*/
if (domain == platform_domain || !domain ||
domain->type != IOMMU_DOMAIN_UNMANAGED)
return 0;
dma_domain = to_fsl_dma_domain(domain);
/*
* Use LIODN of the PCI controller while detaching a
* PCI device.
@ -312,8 +337,18 @@ static void fsl_pamu_set_platform_dma(struct device *dev)
detach_device(dev, dma_domain);
else
pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node);
return 0;
}
static struct iommu_domain_ops fsl_pamu_platform_ops = {
.attach_dev = fsl_pamu_platform_attach,
};
static struct iommu_domain fsl_pamu_platform_domain = {
.type = IOMMU_DOMAIN_PLATFORM,
.ops = &fsl_pamu_platform_ops,
};
/* Set the domain stash attribute */
int fsl_pamu_configure_l1_stash(struct iommu_domain *domain, u32 cpu)
{
@ -395,11 +430,11 @@ static struct iommu_device *fsl_pamu_probe_device(struct device *dev)
}
static const struct iommu_ops fsl_pamu_ops = {
.default_domain = &fsl_pamu_platform_domain,
.capable = fsl_pamu_capable,
.domain_alloc = fsl_pamu_domain_alloc,
.probe_device = fsl_pamu_probe_device,
.device_group = fsl_pamu_device_group,
.set_platform_dma_ops = fsl_pamu_set_platform_dma,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = fsl_pamu_attach_device,
.iova_to_phys = fsl_pamu_iova_to_phys,