linux-kernel - [PATCH v5 08/11] powerpc/pseries/iommu: Update remove_dma

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Date:   Fri, 16 Jul 2021 05:27:53 -0300
From:   Leonardo Bras <leobras.c@...il.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Leonardo Bras <leobras.c@...il.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>,
        kernel test robot <lkp@...el.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Frederic Barrat <fbarrat@...ux.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 08/11] powerpc/pseries/iommu: Update remove_dma_window() to accept property name

Update remove_dma_window() so it can be used to remove DDW with a given
property name.

This enables the creation of new property names for DDW, so we can
have different usage for it, like indirect mapping.

Signed-off-by: Leonardo Bras <leobras.c@...il.com>
Reviewed-by: Alexey Kardashevskiy <aik@...abs.ru>
---
 arch/powerpc/platforms/pseries/iommu.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 108c3dcca686..17c6f4706e76 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -830,31 +830,32 @@ static void remove_dma_window(struct device_node *np, u32 *ddw_avail,
 			np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN], liobn);
 }
 
-static void remove_ddw(struct device_node *np, bool remove_prop)
+static int remove_ddw(struct device_node *np, bool remove_prop, const char *win_name)
 {
 	struct property *win;
 	u32 ddw_avail[DDW_APPLICABLE_SIZE];
 	int ret = 0;
 
+	win = of_find_property(np, win_name, NULL);
+	if (!win)
+		return -EINVAL;
+
 	ret = of_property_read_u32_array(np, "ibm,ddw-applicable",
 					 &ddw_avail[0], DDW_APPLICABLE_SIZE);
 	if (ret)
-		return;
-
-	win = of_find_property(np, DIRECT64_PROPNAME, NULL);
-	if (!win)
-		return;
+		return 0;
 
 	if (win->length >= sizeof(struct dynamic_dma_window_prop))
 		remove_dma_window(np, ddw_avail, win);
 
 	if (!remove_prop)
-		return;
+		return 0;
 
 	ret = of_remove_property(np, win);
 	if (ret)
 		pr_warn("%pOF: failed to remove direct window property: %d\n",
 			np, ret);
+	return 0;
 }
 
 static bool find_existing_ddw(struct device_node *pdn, u64 *dma_addr, int *window_shift)
@@ -907,7 +908,7 @@ static int find_existing_ddw_windows(void)
 	for_each_node_with_property(pdn, DIRECT64_PROPNAME) {
 		direct64 = of_get_property(pdn, DIRECT64_PROPNAME, &len);
 		if (!direct64 || len < sizeof(*direct64)) {
-			remove_ddw(pdn, true);
+			remove_ddw(pdn, true, DIRECT64_PROPNAME);
 			continue;
 		}
 
@@ -1382,7 +1383,7 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	kfree(win64);
 
 out_remove_win:
-	remove_ddw(pdn, true);
+	remove_ddw(pdn, true, DIRECT64_PROPNAME);
 
 out_failed:
 	if (default_win_removed)
@@ -1547,7 +1548,7 @@ static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long acti
 		 * we have to remove the property when releasing
 		 * the device node.
 		 */
-		remove_ddw(np, false);
+		remove_ddw(np, false, DIRECT64_PROPNAME);
 		if (pci && pci->table_group)
 			iommu_pseries_free_group(pci->table_group,
 					np->full_name);
-- 
2.32.0