iommu/fsl_pamu: replace DOMAIN_ATTR_FSL_PAMU_STASH with a direct call

Add a fsl_pamu_configure_l1_stash API that qman_portal can call directly
instead of indirecting through the iommu attr API.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Acked-by: NWill Deacon <will@kernel.org>
Acked-by: NLi Yang <leoyang.li@nxp.com>
Link: https://lore.kernel.org/r/20210401155256.298656-8-hch@lst.deSigned-off-by: NJoerg Roedel <jroedel@suse.de>

arch/powerpc/include/asm/fsl_pamu_stash.h

@@ -7,6 +7,8 @@
 #ifndef __FSL_PAMU_STASH_H
 #define __FSL_PAMU_STASH_H
 
+struct iommu_domain;
+
 /* cache stash targets */
 enum pamu_stash_target {
 	PAMU_ATTR_CACHE_L1 = 1,
@@ -14,14 +16,6 @@ enum pamu_stash_target {
 	PAMU_ATTR_CACHE_L3,
 };
 
-/*
- * This attribute allows configuring stashig specific parameters
- * in the PAMU hardware.
- */
-
-struct pamu_stash_attribute {
-	u32	cpu;	/* cpu number */
-	u32	cache;	/* cache to stash to: L1,L2,L3 */
-};
+int fsl_pamu_configure_l1_stash(struct iommu_domain *domain, u32 cpu);
 
 #endif  /* __FSL_PAMU_STASH_H */

drivers/iommu/fsl_pamu_domain.c

@@ -372,27 +372,20 @@ static void fsl_pamu_detach_device(struct iommu_domain *domain,
 }
 
 /* Set the domain stash attribute */
-static int configure_domain_stash(struct fsl_dma_domain *dma_domain, void *data)
+int fsl_pamu_configure_l1_stash(struct iommu_domain *domain, u32 cpu)
 {
-	struct pamu_stash_attribute *stash_attr = data;
+	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
 	unsigned long flags;
 	int ret;
 
 	spin_lock_irqsave(&dma_domain->domain_lock, flags);
-
-	memcpy(&dma_domain->dma_stash, stash_attr,
-	       sizeof(struct pamu_stash_attribute));
-
-	dma_domain->stash_id = get_stash_id(stash_attr->cache,
-					    stash_attr->cpu);
+	dma_domain->stash_id = get_stash_id(PAMU_ATTR_CACHE_L1, cpu);
 	if (dma_domain->stash_id == ~(u32)0) {
 		pr_debug("Invalid stash attributes\n");
 		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
 		return -EINVAL;
 	}
-
 	ret = update_domain_stash(dma_domain, dma_domain->stash_id);
-
 	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
 
 	return ret;
@@ -426,9 +419,6 @@ static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
 	int ret = 0;
 
 	switch (attr_type) {
-	case DOMAIN_ATTR_FSL_PAMU_STASH:
-		ret = configure_domain_stash(dma_domain, data);
-		break;
 	case DOMAIN_ATTR_FSL_PAMU_ENABLE:
 		ret = configure_domain_dma_state(dma_domain, *(int *)data);
 		break;

drivers/iommu/fsl_pamu_domain.h

@@ -22,9 +22,7 @@ struct fsl_dma_domain {
 	 *
 	 */
 	int				enabled;
-	/* stash_id obtained from the stash attribute details */
 	u32				stash_id;
-	struct pamu_stash_attribute	dma_stash;
 	u32				snoop_id;
 	struct iommu_domain		iommu_domain;
 	spinlock_t			domain_lock;

drivers/soc/fsl/qbman/qman_portal.c

@@ -47,7 +47,6 @@ static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
 #ifdef CONFIG_FSL_PAMU
 	struct device *dev = pcfg->dev;
 	int window_count = 1;
-	struct pamu_stash_attribute stash_attr;
 	int ret;
 
 	pcfg->iommu_domain = iommu_domain_alloc(&platform_bus_type);
@@ -55,13 +54,9 @@ static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
 		dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
 		goto no_iommu;
 	}
-	stash_attr.cpu = cpu;
-	stash_attr.cache = PAMU_ATTR_CACHE_L1;
-	ret = iommu_domain_set_attr(pcfg->iommu_domain,
-				    DOMAIN_ATTR_FSL_PAMU_STASH,
-				    &stash_attr);
+	ret = fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu);
 	if (ret < 0) {
-		dev_err(dev, "%s(): iommu_domain_set_attr() = %d",
+		dev_err(dev, "%s(): fsl_pamu_configure_l1_stash() = %d",
 			__func__, ret);
 		goto out_domain_free;
 	}
@@ -143,15 +138,8 @@ static void qman_portal_update_sdest(const struct qm_portal_config *pcfg,
 							unsigned int cpu)
 {
 #ifdef CONFIG_FSL_PAMU /* TODO */
-	struct pamu_stash_attribute stash_attr;
-	int ret;
-
 	if (pcfg->iommu_domain) {
-		stash_attr.cpu = cpu;
-		stash_attr.cache = PAMU_ATTR_CACHE_L1;
-		ret = iommu_domain_set_attr(pcfg->iommu_domain,
-				DOMAIN_ATTR_FSL_PAMU_STASH, &stash_attr);
-		if (ret < 0) {
+		if (fsl_pamu_configure_l1_stash(pcfg->iommu_domain, cpu) < 0) {
 			dev_err(pcfg->dev,
 				"Failed to update pamu stash setting\n");
 			return;

include/linux/iommu.h

@@ -109,7 +109,6 @@ enum iommu_cap {
 enum iommu_attr {
 	DOMAIN_ATTR_GEOMETRY,
 	DOMAIN_ATTR_PAGING,
-	DOMAIN_ATTR_FSL_PAMU_STASH,
 	DOMAIN_ATTR_FSL_PAMU_ENABLE,
 	DOMAIN_ATTR_NESTING,	/* two stages of translation */
 	DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,