[PATCH 06/20] iommu/fsl_pamu: remove ->domain_window_enable

Christoph Hellwig
2021-04-01T17:58:46Z

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@lst.de>
Acked-by: Li Yang <leoyang.li@nxp.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