iommu/fsl_pamu: enable the liodn when attaching a device

Instead of a separate call to enable all devices from the list, just
enable the liodn once the device is attached to the iommu domain.

This also remove the DOMAIN_ATTR_FSL_PAMU_ENABLE iommu_attr.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Li Yang <leoyang.li@nxp.com>
Link: https://lore.kernel.org/r/20210401155256.298656-11-hch@lst.de
Signed-off-by: Joerg Roedel <jroedel@suse.de>

2 files changed, 3 insertions, 54 deletions

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 41927c3c4177..c2e7e17570e7 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -195,9 +195,6 @@ static void fsl_pamu_domain_free(struct iommu_domain *domain)
 
 	/* remove all the devices from the device list */
 	detach_device(NULL, dma_domain);
-
-	dma_domain->enabled = 0;
-
 	kmem_cache_free(fsl_pamu_domain_cache, dma_domain);
 }
 
@@ -285,6 +282,9 @@ static int fsl_pamu_attach_device(struct iommu_domain *domain,
 		ret = pamu_set_liodn(dma_domain, dev, liodn[i]);
 		if (ret)
 			break;
+		ret = pamu_enable_liodn(liodn[i]);
+		if (ret)
+			break;
 	}
 	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
 	return ret;
@@ -341,46 +341,6 @@ int fsl_pamu_configure_l1_stash(struct iommu_domain *domain, u32 cpu)
 	return ret;
 }
 
-/* Configure domain dma state i.e. enable/disable DMA */
-static int configure_domain_dma_state(struct fsl_dma_domain *dma_domain, bool enable)
-{
-	struct device_domain_info *info;
-	unsigned long flags;
-	int ret;
-
-	spin_lock_irqsave(&dma_domain->domain_lock, flags);
-	dma_domain->enabled = enable;
-	list_for_each_entry(info, &dma_domain->devices, link) {
-		ret = (enable) ? pamu_enable_liodn(info->liodn) :
-			pamu_disable_liodn(info->liodn);
-		if (ret)
-			pr_debug("Unable to set dma state for liodn %d",
-				 info->liodn);
-	}
-	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-
-	return 0;
-}
-
-static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
-				    enum iommu_attr attr_type, void *data)
-{
-	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
-	int ret = 0;
-
-	switch (attr_type) {
-	case DOMAIN_ATTR_FSL_PAMU_ENABLE:
-		ret = configure_domain_dma_state(dma_domain, *(int *)data);
-		break;
-	default:
-		pr_debug("Unsupported attribute type\n");
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
 static struct iommu_group *get_device_iommu_group(struct device *dev)
 {
 	struct iommu_group *group;
@@ -505,7 +465,6 @@ static const struct iommu_ops fsl_pamu_ops = {
 	.attach_dev	= fsl_pamu_attach_device,
 	.detach_dev	= fsl_pamu_detach_device,
 	.iova_to_phys	= fsl_pamu_iova_to_phys,
-	.domain_set_attr = fsl_pamu_set_domain_attr,
 	.probe_device	= fsl_pamu_probe_device,
 	.release_device	= fsl_pamu_release_device,
 	.device_group   = fsl_pamu_device_group,
diff --git a/drivers/iommu/fsl_pamu_domain.h b/drivers/iommu/fsl_pamu_domain.h
index cd488004acd1..5f4ed253f61b 100644
--- a/drivers/iommu/fsl_pamu_domain.h
+++ b/drivers/iommu/fsl_pamu_domain.h
@@ -12,16 +12,6 @@
 struct fsl_dma_domain {
 	/* list of devices associated with the domain */
 	struct list_head		devices;
-	/* dma_domain states:
-	 * enabled - DMA has been enabled for the given
-	 * domain. This translates to setting of the
-	 * valid bit for the primary PAACE in the PAMU
-	 * PAACT table. Domain geometry should be set and
-	 * it must have a valid mapping before DMA can be
-	 * enabled for it.
-	 *
-	 */
-	int				enabled;
 	u32				stash_id;
 	u32				snoop_id;
 	struct iommu_domain		iommu_domain;