Message-Id: <20210401155256.298656-7-hch@lst.de>
Date:   Thu,  1 Apr 2021 17:52:42 +0200
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 06/20] iommu/fsl_pamu: remove ->domain_window_enable

The only thing that fsl_pamu_window_enable does for the current caller
is to fill in the prot value in the only dma_window structure, and to
propagate a few values from the iommu_domain_geometry struture into the
dma_window.  Remove the dma_window entirely, hardcode the prot value and
otherwise use the iommu_domain_geometry structure instead.

Remove the now unused ->domain_window_enable iommu method.

Signed-off-by: Christoph Hellwig <hch@....de>
Acked-by: Li Yang <leoyang.li@....com>
---
 drivers/iommu/fsl_pamu_domain.c     | 182 +++-------------------------
 drivers/iommu/fsl_pamu_domain.h     |  15 ---
 drivers/iommu/iommu.c               |  11 --
 drivers/soc/fsl/qbman/qman_portal.c |   7 --
 include/linux/iommu.h               |  17 ---
 5 files changed, 14 insertions(+), 218 deletions(-)

diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index e6bdd38fc18409..689035e9d40955 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -54,34 +54,18 @@ static int __init iommu_init_mempool(void)
 	return 0;
 }
 
-static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain, dma_addr_t iova)
-{
-	struct dma_window *win_ptr = &dma_domain->win_arr[0];
-	struct iommu_domain_geometry *geom;
-
-	geom = &dma_domain->iommu_domain.geometry;
-
-	if (win_ptr->valid)
-		return win_ptr->paddr + (iova & (win_ptr->size - 1));
-
-	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 dma_window *wnd = &dma_domain->win_arr[0];
-	phys_addr_t wnd_addr = dma_domain->iommu_domain.geometry.aperture_start;
+	struct iommu_domain_geometry *geom = &dma_domain->iommu_domain.geometry;
 	unsigned long flags;
 
 	spin_lock_irqsave(&iommu_lock, flags);
-	ret = pamu_config_ppaace(liodn, wnd_addr,
-				 wnd->size,
-				 ~(u32)0,
-				 wnd->paddr >> PAMU_PAGE_SHIFT,
-				 dma_domain->snoop_id, dma_domain->stash_id,
-				 wnd->prot);
+	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);
@@ -89,33 +73,6 @@ static int map_liodn(int liodn, struct fsl_dma_domain *dma_domain)
 	return ret;
 }
 
-/* Update window/subwindow mapping for the LIODN */
-static int update_liodn(int liodn, struct fsl_dma_domain *dma_domain, u32 wnd_nr)
-{
-	int ret;
-	struct dma_window *wnd = &dma_domain->win_arr[wnd_nr];
-	phys_addr_t wnd_addr;
-	unsigned long flags;
-
-	spin_lock_irqsave(&iommu_lock, flags);
-
-	wnd_addr = dma_domain->iommu_domain.geometry.aperture_start;
-
-	ret = pamu_config_ppaace(liodn, wnd_addr,
-				 wnd->size,
-				 ~(u32)0,
-				 wnd->paddr >> PAMU_PAGE_SHIFT,
-				 dma_domain->snoop_id, dma_domain->stash_id,
-				 wnd->prot);
-	if (ret)
-		pr_debug("Window reconfiguration failed for liodn %d\n",
-			 liodn);
-
-	spin_unlock_irqrestore(&iommu_lock, flags);
-
-	return ret;
-}
-
 static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
 			      u32 val)
 {
@@ -172,26 +129,6 @@ static int pamu_set_liodn(int liodn, struct device *dev,
 	return ret;
 }
 
-static int check_size(u64 size, dma_addr_t iova)
-{
-	/*
-	 * Size must be a power of two and at least be equal
-	 * to PAMU page size.
-	 */
-	if ((size & (size - 1)) || size < PAMU_PAGE_SIZE) {
-		pr_debug("Size too small or not a power of two\n");
-		return -EINVAL;
-	}
-
-	/* iova must be page size aligned */
-	if (iova & (size - 1)) {
-		pr_debug("Address is not aligned with window size\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
 static void remove_device_ref(struct device_domain_info *info)
 {
 	unsigned long flags;
@@ -257,13 +194,10 @@ static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct d
 static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain,
 					 dma_addr_t iova)
 {
-	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
-
 	if (iova < domain->geometry.aperture_start ||
 	    iova > domain->geometry.aperture_end)
 		return 0;
-
-	return get_phys_addr(dma_domain, iova);
+	return iova;
 }
 
 static bool fsl_pamu_capable(enum iommu_cap cap)
@@ -279,7 +213,6 @@ static void fsl_pamu_domain_free(struct iommu_domain *domain)
 	detach_device(NULL, dma_domain);
 
 	dma_domain->enabled = 0;
-	dma_domain->mapped = 0;
 
 	kmem_cache_free(fsl_pamu_domain_cache, dma_domain);
 }
@@ -323,84 +256,6 @@ static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val)
 	return ret;
 }
 
-/* Update domain mappings for all LIODNs associated with the domain */
-static int update_domain_mapping(struct fsl_dma_domain *dma_domain, u32 wnd_nr)
-{
-	struct device_domain_info *info;
-	int ret = 0;
-
-	list_for_each_entry(info, &dma_domain->devices, link) {
-		ret = update_liodn(info->liodn, dma_domain, wnd_nr);
-		if (ret)
-			break;
-	}
-	return ret;
-}
-
-
-static int fsl_pamu_window_enable(struct iommu_domain *domain, u32 wnd_nr,
-				  phys_addr_t paddr, u64 size, int prot)
-{
-	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
-	struct dma_window *wnd;
-	int pamu_prot = 0;
-	int ret;
-	unsigned long flags;
-	u64 win_size;
-
-	if (prot & IOMMU_READ)
-		pamu_prot |= PAACE_AP_PERMS_QUERY;
-	if (prot & IOMMU_WRITE)
-		pamu_prot |= PAACE_AP_PERMS_UPDATE;
-
-	spin_lock_irqsave(&dma_domain->domain_lock, flags);
-	if (wnd_nr > 0) {
-		pr_debug("Invalid window index\n");
-		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-		return -EINVAL;
-	}
-
-	win_size = (domain->geometry.aperture_end + 1) >> ilog2(1);
-	if (size > win_size) {
-		pr_debug("Invalid window size\n");
-		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-		return -EINVAL;
-	}
-
-	if (dma_domain->enabled) {
-		pr_debug("Disable the window before updating the mapping\n");
-		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-		return -EBUSY;
-	}
-
-	ret = check_size(size, domain->geometry.aperture_start);
-	if (ret) {
-		pr_debug("Aperture start not aligned to the size\n");
-		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-		return -EINVAL;
-	}
-
-	wnd = &dma_domain->win_arr[wnd_nr];
-	if (!wnd->valid) {
-		wnd->paddr = paddr;
-		wnd->size = size;
-		wnd->prot = pamu_prot;
-
-		ret = update_domain_mapping(dma_domain, wnd_nr);
-		if (!ret) {
-			wnd->valid = 1;
-			dma_domain->mapped++;
-		}
-	} else {
-		pr_debug("Disable the window before updating the mapping\n");
-		ret = -EBUSY;
-	}
-
-	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-
-	return ret;
-}
-
 /*
  * Attach the LIODN to the DMA domain and configure the geometry
  * and window mappings.
@@ -434,15 +289,14 @@ static int handle_attach_device(struct fsl_dma_domain *dma_domain,
 				     &domain->geometry);
 		if (ret)
 			break;
-		if (dma_domain->mapped) {
-			/*
-			 * Create window/subwindow mapping for
-			 * the LIODN.
-			 */
-			ret = map_liodn(liodn[i], dma_domain);
-			if (ret)
-				break;
-		}
+
+		/*
+		 * Create window/subwindow mapping for
+		 * the LIODN.
+		 */
+		ret = map_liodn(liodn[i], dma_domain);
+		if (ret)
+			break;
 	}
 	spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
 
@@ -552,13 +406,6 @@ static int configure_domain_dma_state(struct fsl_dma_domain *dma_domain, bool en
 	int ret;
 
 	spin_lock_irqsave(&dma_domain->domain_lock, flags);
-
-	if (enable && !dma_domain->mapped) {
-		pr_debug("Can't enable DMA domain without valid mapping\n");
-		spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-		return -ENODEV;
-	}
-
 	dma_domain->enabled = enable;
 	list_for_each_entry(info, &dma_domain->devices, link) {
 		ret = (enable) ? pamu_enable_liodn(info->liodn) :
@@ -717,7 +564,6 @@ static const struct iommu_ops fsl_pamu_ops = {
 	.domain_free    = fsl_pamu_domain_free,
 	.attach_dev	= fsl_pamu_attach_device,
 	.detach_dev	= fsl_pamu_detach_device,
-	.domain_window_enable = fsl_pamu_window_enable,
 	.iova_to_phys	= fsl_pamu_iova_to_phys,
 	.domain_set_attr = fsl_pamu_set_domain_attr,
 	.probe_device	= fsl_pamu_probe_device,
diff --git a/drivers/iommu/fsl_pamu_domain.h b/drivers/iommu/fsl_pamu_domain.h
index d3523ee9999d83..13ee06e0ef0136 100644
--- a/drivers/iommu/fsl_pamu_domain.h
+++ b/drivers/iommu/fsl_pamu_domain.h
@@ -9,24 +9,10 @@
 
 #include "fsl_pamu.h"
 
-struct dma_window {
-	phys_addr_t paddr;
-	u64 size;
-	int valid;
-	int prot;
-};
-
 struct fsl_dma_domain {
-	/*
-	 * win_arr contains information of the configured
-	 * windows for a domain.
-	 */
-	struct dma_window		win_arr[1];
 	/* list of devices associated with the domain */
 	struct list_head		devices;
 	/* dma_domain states:
-	 * mapped - A particular mapping has been created
-	 * within the configured geometry.
 	 * enabled - DMA has been enabled for the given
 	 * domain. This translates to setting of the
 	 * valid bit for the primary PAACE in the PAMU
@@ -35,7 +21,6 @@ struct fsl_dma_domain {
 	 * enabled for it.
 	 *
 	 */
-	int				mapped;
 	int				enabled;
 	/* stash_id obtained from the stash attribute details */
 	u32				stash_id;
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index d0b0a15dba8413..b212bf0261820b 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2610,17 +2610,6 @@ size_t iommu_map_sg_atomic(struct iommu_domain *domain, unsigned long iova,
 	return __iommu_map_sg(domain, iova, sg, nents, prot, GFP_ATOMIC);
 }
 
-int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
-			       phys_addr_t paddr, u64 size, int prot)
-{
-	if (unlikely(domain->ops->domain_window_enable == NULL))
-		return -ENODEV;
-
-	return domain->ops->domain_window_enable(domain, wnd_nr, paddr, size,
-						 prot);
-}
-EXPORT_SYMBOL_GPL(iommu_domain_window_enable);
-
 /**
  * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework
  * @domain: the iommu domain where the fault has happened
diff --git a/drivers/soc/fsl/qbman/qman_portal.c b/drivers/soc/fsl/qbman/qman_portal.c
index 3d56ec4b373b4b..9ee1663f422cbf 100644
--- a/drivers/soc/fsl/qbman/qman_portal.c
+++ b/drivers/soc/fsl/qbman/qman_portal.c
@@ -65,13 +65,6 @@ static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
 			__func__, ret);
 		goto out_domain_free;
 	}
-	ret = iommu_domain_window_enable(pcfg->iommu_domain, 0, 0, 1ULL << 36,
-					 IOMMU_READ | IOMMU_WRITE);
-	if (ret < 0) {
-		dev_err(dev, "%s(): iommu_domain_window_enable() = %d",
-			__func__, ret);
-		goto out_domain_free;
-	}
 	ret = iommu_attach_device(pcfg->iommu_domain, dev);
 	if (ret < 0) {
 		dev_err(dev, "%s(): iommu_device_attach() = %d", __func__,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 861c3558c878bf..f7baa81887a8bc 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -203,7 +203,6 @@ struct iommu_iotlb_gather {
  * @get_resv_regions: Request list of reserved regions for a device
  * @put_resv_regions: Free list of reserved regions for a device
  * @apply_resv_region: Temporary helper call-back for iova reserved ranges
- * @domain_window_enable: Configure and enable a particular window for a domain
  * @of_xlate: add OF master IDs to iommu grouping
  * @is_attach_deferred: Check if domain attach should be deferred from iommu
  *                      driver init to device driver init (default no)
@@ -261,10 +260,6 @@ struct iommu_ops {
 				  struct iommu_domain *domain,
 				  struct iommu_resv_region *region);
 
-	/* Window handling functions */
-	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
-				    phys_addr_t paddr, u64 size, int prot);
-
 	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
 	bool (*is_attach_deferred)(struct iommu_domain *domain, struct device *dev);
 
@@ -505,11 +500,6 @@ extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,
 extern int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr,
 				 void *data);
 
-/* Window handling function prototypes */
-extern int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr,
-				      phys_addr_t offset, u64 size,
-				      int prot);
-
 extern int report_iommu_fault(struct iommu_domain *domain, struct device *dev,
 			      unsigned long iova, int flags);
 
@@ -735,13 +725,6 @@ static inline void iommu_iotlb_sync(struct iommu_domain *domain,
 {
 }
 
-static inline int iommu_domain_window_enable(struct iommu_domain *domain,
-					     u32 wnd_nr, phys_addr_t paddr,
-					     u64 size, int prot)
-{
-	return -ENODEV;
-}
-
 static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 {
 	return 0;
-- 
2.30.1

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