netdev - [PATCH 08/17] iommu/fsl_pamu: merge pamu_set_liodn and map

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Message-Id: <20210301084257.945454-9-hch@lst.de>
Date:   Mon,  1 Mar 2021 09:42:48 +0100
From:   Christoph Hellwig <hch@....de>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Li Yang <leoyang.li@....com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [PATCH 08/17] iommu/fsl_pamu: merge pamu_set_liodn and map_liodn

Merge the two fuctions that configure the ppaace into a single coherent
function.  I somehow doubt we need the two pamu_config_ppaace calls,
but keep the existing behavior just to be on the safe side.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/iommu/fsl_pamu_domain.c | 65 +++++++++------------------------
 1 file changed, 17 insertions(+), 48 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 40eff4b7bc5d42..4a4944332674f7 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -54,25 +54,6 @@ static int __init iommu_init_mempool(void)
 	return 0;
 }
 
-/* Map the DMA window corresponding to the LIODN */
-static int map_liodn(int liodn, struct fsl_dma_domain *dma_domain)
-{
-	int ret;
-	struct iommu_domain_geometry *geom = &dma_domain->iommu_domain.geometry;
-	unsigned long flags;
-
-	spin_lock_irqsave(&iommu_lock, flags);
-	ret = pamu_config_ppaace(liodn, geom->aperture_start,
-				 geom->aperture_end - 1, ~(u32)0,
-				 0, dma_domain->snoop_id, dma_domain->stash_id,
-				 PAACE_AP_PERMS_QUERY | PAACE_AP_PERMS_UPDATE);
-	spin_unlock_irqrestore(&iommu_lock, flags);
-	if (ret)
-		pr_debug("PAACE configuration failed for liodn %d\n", liodn);
-
-	return ret;
-}
-
 static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
 			      u32 val)
 {
@@ -94,11 +75,11 @@ static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
 }
 
 /* Set the geometry parameters for a LIODN */
-static int pamu_set_liodn(int liodn, struct device *dev,
-			  struct fsl_dma_domain *dma_domain,
-			  struct iommu_domain_geometry *geom_attr)
+static int pamu_set_liodn(struct fsl_dma_domain *dma_domain, struct device *dev,
+			  int liodn)
 {
-	phys_addr_t window_addr, window_size;
+	struct iommu_domain *domain = &dma_domain->iommu_domain;
+	struct iommu_domain_geometry *geom = &domain->geometry;
 	u32 omi_index = ~(u32)0;
 	unsigned long flags;
 	int ret;
@@ -110,22 +91,25 @@ static int pamu_set_liodn(int liodn, struct device *dev,
 	 */
 	get_ome_index(&omi_index, dev);
 
-	window_addr = geom_attr->aperture_start;
-	window_size = geom_attr->aperture_end + 1;
-
 	spin_lock_irqsave(&iommu_lock, flags);
 	ret = pamu_disable_liodn(liodn);
-	if (!ret)
-		ret = pamu_config_ppaace(liodn, window_addr, window_size, omi_index,
-					 0, dma_domain->snoop_id,
-					 dma_domain->stash_id, 0);
+	if (ret)
+		goto out_unlock;
+	ret = pamu_config_ppaace(liodn, geom->aperture_start,
+				 geom->aperture_end - 1, omi_index, 0,
+				 dma_domain->snoop_id, dma_domain->stash_id, 0);
+	if (ret)
+		goto out_unlock;
+	ret = pamu_config_ppaace(liodn, geom->aperture_start,
+				 geom->aperture_end - 1, ~(u32)0,
+				 0, dma_domain->snoop_id, dma_domain->stash_id,
+				 PAACE_AP_PERMS_QUERY | PAACE_AP_PERMS_UPDATE);
+out_unlock:
 	spin_unlock_irqrestore(&iommu_lock, flags);
 	if (ret) {
 		pr_debug("PAACE configuration failed for liodn %d\n",
 			 liodn);
-		return ret;
 	}
-
 	return ret;
 }
 
@@ -265,7 +249,6 @@ static int handle_attach_device(struct fsl_dma_domain *dma_domain,
 				int num)
 {
 	unsigned long flags;
-	struct iommu_domain *domain = &dma_domain->iommu_domain;
 	int ret = 0;
 	int i;
 
@@ -280,21 +263,7 @@ static int handle_attach_device(struct fsl_dma_domain *dma_domain,
 		}
 
 		attach_device(dma_domain, liodn[i], dev);
-		/*
-		 * Check if geometry has already been configured
-		 * for the domain. If yes, set the geometry for
-		 * the LIODN.
-		 */
-		ret = pamu_set_liodn(liodn[i], dev, dma_domain,
-				     &domain->geometry);
-		if (ret)
-			break;
-
-		/*
-		 * Create window/subwindow mapping for
-		 * the LIODN.
-		 */
-		ret = map_liodn(liodn[i], dma_domain);
+		ret = pamu_set_liodn(dma_domain, dev, liodn[i]);
 		if (ret)
 			break;
 	}
-- 
2.29.2