[PATCH 05/20] iommu/fsl_pamu: remove support for multiple windows

Christoph Hellwig
2021-04-01T17:42:32Z

The only domains allocated forces use of a single window. Remove all
the code related to multiple window support, as well as the need for
qman_portal to force a single window.

Remove the now unused DOMAIN_ATTR_WINDOWS iommu_attr.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Li Yang <leoyang.li@nxp.com>
---
drivers/iommu/fsl_pamu.c | 264 +-------------------------
drivers/iommu/fsl_pamu.h | 10 +-
drivers/iommu/fsl_pamu_domain.c | 275 +++++-----------------------
drivers/iommu/fsl_pamu_domain.h | 16 +-
drivers/soc/fsl/qbman/qman_portal.c | 7 -
include/linux/iommu.h | 1 -
6 files changed, 60 insertions(+), 513 deletions(-)

diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c
index b9a974d9783113..3e1647cd5ad47a 100644
--- a/drivers/iommu/fsl_pamu.c
+++ b/drivers/iommu/fsl_pamu.c
@@ -63,19 +63,6 @@ static const struct of_device_id l3_device_ids[] = {
/* maximum subwindows permitted per liodn */
static u32 max_subwindow_count;

-/* Pool for fspi allocation */
-static struct gen_pool *spaace_pool;
-
-/**
- * pamu_get_max_subwin_cnt() - Return the maximum supported
- * subwindow count per liodn.
- *
- */
-u32 pamu_get_max_subwin_cnt(void)
-{
- return max_subwindow_count;
-}
-
/**
* pamu_get_ppaace() - Return the primary PACCE
* @liodn: liodn PAACT index for desired PAACE
@@ -155,13 +142,6 @@ static unsigned int map_addrspace_size_to_wse(phys_addr_t addrspace_size)
return fls64(addrspace_size) - 2;
}

-/* Derive the PAACE window count encoding for the subwindow count */
-static unsigned int map_subwindow_cnt_to_wce(u32 subwindow_cnt)
-{
- /* window count is 2^(WCE+1) bytes */
- return __ffs(subwindow_cnt) - 1;
-}
-
/*
* Set the PAACE type as primary and set the coherency required domain
* attribute
@@ -174,89 +154,11 @@ static void pamu_init_ppaace(struct paace *ppaace)
PAACE_M_COHERENCE_REQ);
}

-/*
- * Set the PAACE type as secondary and set the coherency required domain
- * attribute.
- */
-static void pamu_init_spaace(struct paace *spaace)
-{
- set_bf(spaace->addr_bitfields, PAACE_AF_PT, PAACE_PT_SECONDARY);
- set_bf(spaace->domain_attr.to_host.coherency_required, PAACE_DA_HOST_CR,
- PAACE_M_COHERENCE_REQ);
-}
-
-/*
- * Return the spaace (corresponding to the secondary window index)
- * for a particular ppaace.
- */
-static struct paace *pamu_get_spaace(struct paace *paace, u32 wnum)
-{
- u32 subwin_cnt;
- struct paace *spaace = NULL;
-
- subwin_cnt = 1UL << (get_bf(paace->impl_attr, PAACE_IA_WCE) + 1);
-
- if (wnum < subwin_cnt)
- spaace = &spaact[paace->fspi + wnum];
- else
- pr_debug("secondary paace out of bounds\n");
-
- return spaace;
-}
-
-/**
- * pamu_get_fspi_and_allocate() - Allocates fspi index and reserves subwindows
- * required for primary PAACE in the secondary
- * PAACE table.
- * @subwin_cnt: Number of subwindows to be reserved.
- *
- * A PPAACE entry may have a number of associated subwindows. A subwindow
- * corresponds to a SPAACE entry in the SPAACT table. Each PAACE entry stores
- * the index (fspi) of the first SPAACE entry in the SPAACT table. This
- * function returns the index of the first SPAACE entry. The remaining
- * SPAACE entries are reserved contiguously from that index.
- *
- * Returns a valid fspi index in the range of 0 - SPAACE_NUMBER_ENTRIES on success.
- * If no SPAACE entry is available or the allocator can not reserve the required
- * number of contiguous entries function returns ULONG_MAX indicating a failure.
- *
- */
-static unsigned long pamu_get_fspi_and_allocate(u32 subwin_cnt)
-{
- unsigned long spaace_addr;
-
- spaace_addr = gen_pool_alloc(spaace_pool, subwin_cnt * sizeof(struct paace));
- if (!spaace_addr)
- return ULONG_MAX;
-
- return (spaace_addr - (unsigned long)spaact) / (sizeof(struct paace));
-}
-
-/* Release the subwindows reserved for a particular LIODN */
-void pamu_free_subwins(int liodn)
-{
- struct paace *ppaace;
- u32 subwin_cnt, size;
-
- ppaace = pamu_get_ppaace(liodn);
- if (!ppaace) {
- pr_debug("Invalid liodn entry\n");
- return;
- }
-
- if (get_bf(ppaace->addr_bitfields, PPAACE_AF_MW)) {
- subwin_cnt = 1UL << (get_bf(ppaace->impl_attr, PAACE_IA_WCE) + 1);
- size = (subwin_cnt - 1) * sizeof(struct paace);
- gen_pool_free(spaace_pool, (unsigned long)&spaact[ppaace->fspi], size);
- set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
- }
-}
-
/*
* Function used for updating stash destination for the coressponding
* LIODN.
*/
-int pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
+int pamu_update_paace_stash(int liodn, u32 value)
{
struct paace *paace;

@@ -265,11 +167,6 @@ int pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
pr_debug("Invalid liodn entry\n");
return -ENOENT;
}
- if (subwin) {
- paace = pamu_get_spaace(paace, subwin - 1);
- if (!paace)
- return -ENOENT;
- }
set_bf(paace->impl_attr, PAACE_IA_CID, value);

mb();
@@ -277,31 +174,6 @@ int pamu_update_paace_stash(int liodn, u32 subwin, u32 value)
return 0;
}

-/* Disable a subwindow corresponding to the LIODN */
-int pamu_disable_spaace(int liodn, u32 subwin)
-{
- struct paace *paace;
-
- paace = pamu_get_ppaace(liodn);
- if (!paace) {
- pr_debug("Invalid liodn entry\n");
- return -ENOENT;
- }
- if (subwin) {
- paace = pamu_get_spaace(paace, subwin - 1);
- if (!paace)
- return -ENOENT;
- set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_INVALID);
- } else {
- set_bf(paace->addr_bitfields, PAACE_AF_AP,
- PAACE_AP_PERMS_DENIED);
- }
-
- mb();
-
- return 0;
-}
-
/**
* pamu_config_paace() - Sets up PPAACE entry for specified liodn
*
@@ -314,17 +186,15 @@ int pamu_disable_spaace(int liodn, u32 subwin)
* stashid not defined
* @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
* snoopid not defined
- * @subwin_cnt: number of sub-windows
* @prot: window permissions
*
* Returns 0 upon success else error code < 0 returned
*/
int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
u32 omi, unsigned long rpn, u32 snoopid, u32 stashid,
- u32 subwin_cnt, int prot)
+ int prot)
{
struct paace *ppaace;
- unsigned long fspi;

if ((win_size & (win_size - 1)) || win_size < PAMU_PAGE_SIZE) {
pr_debug("window size too small or not a power of two %pa\n",
@@ -368,116 +238,12 @@ int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
if (~snoopid != 0)
ppaace->domain_attr.to_host.snpid = snoopid;

- if (subwin_cnt) {
- /* The first entry is in the primary PAACE instead */
- fspi = pamu_get_fspi_and_allocate(subwin_cnt - 1);
- if (fspi == ULONG_MAX) {
- pr_debug("spaace indexes exhausted\n");
- return -EINVAL;
- }
-
- /* window count is 2^(WCE+1) bytes */
- set_bf(ppaace->impl_attr, PAACE_IA_WCE,
- map_subwindow_cnt_to_wce(subwin_cnt));
- set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0x1);
- ppaace->fspi = fspi;
- } else {
- set_bf(ppaace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
- ppaace->twbah = rpn >> 20;
- set_bf(ppaace->win_bitfields, PAACE_WIN_TWBAL, rpn);
- set_bf(ppaace->addr_bitfields, PAACE_AF_AP, prot);
- set_bf(ppaace->impl_attr, PAACE_IA_WCE, 0);
- set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
- }
- mb();
-
- return 0;
-}
-
-/**
- * pamu_config_spaace() - Sets up SPAACE entry for specified subwindow
- *
- * @liodn: Logical IO device number
- * @subwin_cnt: number of sub-windows associated with dma-window
- * @subwin: subwindow index
- * @subwin_size: size of subwindow
- * @omi: Operation mapping index
- * @rpn: real (true physical) page number
- * @snoopid: snoop id for hardware coherency -- if ~snoopid == 0 then
- * snoopid not defined
- * @stashid: cache stash id for associated cpu
- * @enable: enable/disable subwindow after reconfiguration
- * @prot: sub window permissions
- *
- * Returns 0 upon success else error code < 0 returned
- */
-int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin,
- phys_addr_t subwin_size, u32 omi, unsigned long rpn,
- u32 snoopid, u32 stashid, int enable, int prot)
-{
- struct paace *paace;
-
- /* setup sub-windows */
- if (!subwin_cnt) {
- pr_debug("Invalid subwindow count\n");
- return -EINVAL;
- }
-
- paace = pamu_get_ppaace(liodn);
- if (subwin > 0 && subwin < subwin_cnt && paace) {
- paace = pamu_get_spaace(paace, subwin - 1);
-
- if (paace && !(paace->addr_bitfields & PAACE_V_VALID)) {
- pamu_init_spaace(paace);
- set_bf(paace->addr_bitfields, SPAACE_AF_LIODN, liodn);
- }
- }
-
- if (!paace) {
- pr_debug("Invalid liodn entry\n");
- return -ENOENT;
- }
-
- if ((subwin_size & (subwin_size - 1)) || subwin_size < PAMU_PAGE_SIZE) {
- pr_debug("subwindow size out of range, or not a power of 2\n");
- return -EINVAL;
- }
-
- if (rpn == ULONG_MAX) {
- pr_debug("real page number out of range\n");
- return -EINVAL;
- }
-
- /* window size is 2^(WSE+1) bytes */
- set_bf(paace->win_bitfields, PAACE_WIN_SWSE,
- map_addrspace_size_to_wse(subwin_size));
-
- set_bf(paace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
- paace->twbah = rpn >> 20;
- set_bf(paace->win_bitfields, PAACE_WIN_TWBAL, rpn);
- set_bf(paace->addr_bitfields, PAACE_AF_AP, prot);
-
- /* configure snoop id */
- if (~snoopid != 0)
- paace->domain_attr.to_host.snpid = snoopid;
-
- /* set up operation mapping if it's configured */
- if (omi < OME_NUMBER_ENTRIES) {
- set_bf(paace->impl_attr, PAACE_IA_OTM, PAACE_OTM_INDEXED);
- paace->op_encode.index_ot.omi = omi;
- } else if (~omi != 0) {
- pr_debug("bad operation mapping index: %d\n", omi);
- return -EINVAL;
- }
-
- if (~stashid != 0)
- set_bf(paace->impl_attr, PAACE_IA_CID, stashid);
-
- smp_wmb();
-
- if (enable)
- set_bf(paace->addr_bitfields, PAACE_AF_V, PAACE_V_VALID);
-
+ set_bf(ppaace->impl_attr, PAACE_IA_ATM, PAACE_ATM_WINDOW_XLATE);
+ ppaace->twbah = rpn >> 20;
+ set_bf(ppaace->win_bitfields, PAACE_WIN_TWBAL, rpn);
+ set_bf(ppaace->addr_bitfields, PAACE_AF_AP, prot);
+ set_bf(ppaace->impl_attr, PAACE_IA_WCE, 0);
+ set_bf(ppaace->addr_bitfields, PPAACE_AF_MW, 0);
mb();

return 0;
@@ -1129,17 +895,6 @@ static int fsl_pamu_probe(struct platform_device *pdev)
spaact_phys = virt_to_phys(spaact);
omt_phys = virt_to_phys(omt);

- spaace_pool = gen_pool_create(ilog2(sizeof(struct paace)), -1);
- if (!spaace_pool) {
- ret = -ENOMEM;
- dev_err(dev, "Failed to allocate spaace gen pool\n");
- goto error;
- }
-
- ret = gen_pool_add(spaace_pool, (unsigned long)spaact, SPAACT_SIZE, -1);
- if (ret)
- goto error_genpool;
-
pamubypenr = in_be32(&guts_regs->pamubypenr);

for (pamu_reg_off = 0, pamu_counter = 0x80000000; pamu_reg_off < size;
@@ -1167,9 +922,6 @@ static int fsl_pamu_probe(struct platform_device *pdev)

return 0;

-error_genpool:
- gen_pool_destroy(spaace_pool);
-
error:
if (irq != NO_IRQ)
free_irq(irq, data);
diff --git a/drivers/iommu/fsl_pamu.h b/drivers/iommu/fsl_pamu.h
index e1496ba96160fd..04fd843d718dd1 100644
--- a/drivers/iommu/fsl_pamu.h
+++ b/drivers/iommu/fsl_pamu.h
@@ -383,18 +383,12 @@ struct ome {
int pamu_domain_init(void);
int pamu_enable_liodn(int liodn);
int pamu_disable_liodn(int liodn);
-void pamu_free_subwins(int liodn);
int pamu_config_ppaace(int liodn, phys_addr_t win_addr, phys_addr_t win_size,
u32 omi, unsigned long rpn, u32 snoopid, uint32_t stashid,
- u32 subwin_cnt, int prot);
-int pamu_config_spaace(int liodn, u32 subwin_cnt, u32 subwin_addr,
- phys_addr_t subwin_size, u32 omi, unsigned long rpn,
- uint32_t snoopid, u32 stashid, int enable, int prot);
+ int prot);

u32 get_stash_id(u32 stash_dest_hint, u32 vcpu);
void get_ome_index(u32 *omi_index, struct device *dev);
-int pamu_update_paace_stash(int liodn, u32 subwin, u32 value);
-int pamu_disable_spaace(int liodn, u32 subwin);
-u32 pamu_get_max_subwin_cnt(void);
+int pamu_update_paace_stash(int liodn, u32 value);

#endif /* __FSL_PAMU_H */
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index a4da5597755d3d..e6bdd38fc18409 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -56,65 +56,19 @@ static int __init iommu_init_mempool(void)

static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain, dma_addr_t iova)
{
- u32 win_cnt = dma_domain->win_cnt;
struct dma_window *win_ptr = &dma_domain->win_arr[0];
struct iommu_domain_geometry *geom;

geom = &dma_domain->iommu_domain.geometry;

- if (!win_cnt) {
- pr_debug("Number of windows/geometry not configured for the domain\n");
- return 0;
- }
-
- if (win_cnt > 1) {
- u64 subwin_size;
- dma_addr_t subwin_iova;
- u32 wnd;
-
- subwin_size = (geom->aperture_end + 1) >> ilog2(win_cnt);
- subwin_iova = iova & ~(subwin_size - 1);
- wnd = (subwin_iova - geom->aperture_start) >> ilog2(subwin_size);
- win_ptr = &dma_domain->win_arr[wnd];
- }
-
if (win_ptr->valid)
return win_ptr->paddr + (iova & (win_ptr->size - 1));

return 0;
}

-static int map_subwins(int liodn, struct fsl_dma_domain *dma_domain)
-{
- struct dma_window *sub_win_ptr = &dma_domain->win_arr[0];
- int i, ret;
- unsigned long rpn, flags;
-
- for (i = 0; i < dma_domain->win_cnt; i++) {
- if (sub_win_ptr[i].valid) {
- rpn = sub_win_ptr[i].paddr >> PAMU_PAGE_SHIFT;
- spin_lock_irqsave(&iommu_lock, flags);
- ret = pamu_config_spaace(liodn, dma_domain->win_cnt, i,
- sub_win_ptr[i].size,
- ~(u32)0,
- rpn,
- dma_domain->snoop_id,
- dma_domain->stash_id,
- (i > 0) ? 1 : 0,
- sub_win_ptr[i].prot);
- spin_unlock_irqrestore(&iommu_lock, flags);
- if (ret) {
- pr_debug("SPAACE configuration failed for liodn %d\n",
- liodn);
- return ret;
- }
- }
- }
-
- return ret;
-}
-
-static int map_win(int liodn, struct fsl_dma_domain *dma_domain)
+/* 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];
@@ -127,7 +81,7 @@ static int map_win(int liodn, struct fsl_dma_domain *dma_domain)
~(u32)0,
wnd->paddr >> PAMU_PAGE_SHIFT,
dma_domain->snoop_id, dma_domain->stash_id,
- 0, wnd->prot);
+ wnd->prot);
spin_unlock_irqrestore(&iommu_lock, flags);
if (ret)
pr_debug("PAACE configuration failed for liodn %d\n", liodn);
@@ -135,50 +89,27 @@ static int map_win(int liodn, struct fsl_dma_domain *dma_domain)
return ret;
}

-/* Map the DMA window corresponding to the LIODN */
-static int map_liodn(int liodn, struct fsl_dma_domain *dma_domain)
-{
- if (dma_domain->win_cnt > 1)
- return map_subwins(liodn, dma_domain);
- else
- return map_win(liodn, dma_domain);
-}
-
/* 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);
- if (dma_domain->win_cnt > 1) {
- ret = pamu_config_spaace(liodn, dma_domain->win_cnt, wnd_nr,
- wnd->size,
- ~(u32)0,
- wnd->paddr >> PAMU_PAGE_SHIFT,
- dma_domain->snoop_id,
- dma_domain->stash_id,
- (wnd_nr > 0) ? 1 : 0,
- wnd->prot);
- if (ret)
- pr_debug("Subwindow reconfiguration failed for liodn %d\n",
- liodn);
- } else {
- phys_addr_t wnd_addr;

- wnd_addr = dma_domain->iommu_domain.geometry.aperture_start;
+ 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,
- 0, wnd->prot);
- if (ret)
- pr_debug("Window reconfiguration failed for liodn %d\n",
- liodn);
- }
+ 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);

@@ -192,21 +123,12 @@ static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain,
unsigned long flags;

spin_lock_irqsave(&iommu_lock, flags);
- if (!dma_domain->win_arr) {
- pr_debug("Windows not configured, stash destination update failed for liodn %d\n",
- liodn);
+ ret = pamu_update_paace_stash(liodn, val);
+ if (ret) {
+ pr_debug("Failed to update SPAACE %d field for liodn %d\n ",
+ i, liodn);
spin_unlock_irqrestore(&iommu_lock, flags);
- return -EINVAL;
- }
-
- for (i = 0; i < dma_domain->win_cnt; i++) {
- ret = pamu_update_paace_stash(liodn, i, val);
- if (ret) {
- pr_debug("Failed to update SPAACE %d field for liodn %d\n ",
- i, liodn);
- spin_unlock_irqrestore(&iommu_lock, flags);
- return ret;
- }
+ return ret;
}

spin_unlock_irqrestore(&iommu_lock, flags);
@@ -217,14 +139,12 @@ 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,
- u32 win_cnt)
+ struct iommu_domain_geometry *geom_attr)
{
phys_addr_t window_addr, window_size;
- phys_addr_t subwin_size;
- int ret = 0, i;
u32 omi_index = ~(u32)0;
unsigned long flags;
+ int ret;

/*
* Configure the omi_index at the geometry setup time.
@@ -241,34 +161,14 @@ static int pamu_set_liodn(int liodn, struct device *dev,
if (!ret)
ret = pamu_config_ppaace(liodn, window_addr, window_size, omi_index,
0, dma_domain->snoop_id,
- dma_domain->stash_id, win_cnt, 0);
+ dma_domain->stash_id, 0);
spin_unlock_irqrestore(&iommu_lock, flags);
if (ret) {
- pr_debug("PAACE configuration failed for liodn %d, win_cnt =%d\n",
- liodn, win_cnt);
+ pr_debug("PAACE configuration failed for liodn %d\n",
+ liodn);
return ret;
}

- if (win_cnt > 1) {
- subwin_size = window_size >> ilog2(win_cnt);
- for (i = 0; i < win_cnt; i++) {
- spin_lock_irqsave(&iommu_lock, flags);
- ret = pamu_disable_spaace(liodn, i);
- if (!ret)
- ret = pamu_config_spaace(liodn, win_cnt, i,
- subwin_size, omi_index,
- 0, dma_domain->snoop_id,
- dma_domain->stash_id,
- 0, 0);
- spin_unlock_irqrestore(&iommu_lock, flags);
- if (ret) {
- pr_debug("SPAACE configuration failed for liodn %d\n",
- liodn);
- return ret;
- }
- }
- }
-
return ret;
}

@@ -292,14 +192,12 @@ static int check_size(u64 size, dma_addr_t iova)
return 0;
}

-static void remove_device_ref(struct device_domain_info *info, u32 win_cnt)
+static void remove_device_ref(struct device_domain_info *info)
{
unsigned long flags;

list_del(&info->link);
spin_lock_irqsave(&iommu_lock, flags);
- if (win_cnt > 1)
- pamu_free_subwins(info->liodn);
pamu_disable_liodn(info->liodn);
spin_unlock_irqrestore(&iommu_lock, flags);
spin_lock_irqsave(&device_domain_lock, flags);
@@ -317,7 +215,7 @@ static void detach_device(struct device *dev, struct fsl_dma_domain *dma_domain)
/* Remove the device from the domain device list */
list_for_each_entry_safe(info, tmp, &dma_domain->devices, link) {
if (!dev || (info->dev == dev))
- remove_device_ref(info, dma_domain->win_cnt);
+ remove_device_ref(info);
}
spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
}
@@ -399,7 +297,6 @@ static struct iommu_domain *fsl_pamu_domain_alloc(unsigned type)

dma_domain->stash_id = ~(u32)0;
dma_domain->snoop_id = ~(u32)0;
- dma_domain->win_cnt = pamu_get_max_subwin_cnt();
INIT_LIST_HEAD(&dma_domain->devices);
spin_lock_init(&dma_domain->domain_lock);

@@ -411,24 +308,6 @@ static struct iommu_domain *fsl_pamu_domain_alloc(unsigned type)
return &dma_domain->iommu_domain;
}

-/* Configure geometry settings for all LIODNs associated with domain */
-static int pamu_set_domain_geometry(struct fsl_dma_domain *dma_domain,
- struct iommu_domain_geometry *geom_attr,
- u32 win_cnt)
-{
- struct device_domain_info *info;
- int ret = 0;
-
- list_for_each_entry(info, &dma_domain->devices, link) {
- ret = pamu_set_liodn(info->liodn, info->dev, dma_domain,
- geom_attr, win_cnt);
- if (ret)
- break;
- }
-
- return ret;
-}
-
/* Update stash destination for all LIODNs associated with the domain */
static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val)
{
@@ -475,39 +354,30 @@ static int fsl_pamu_window_enable(struct iommu_domain *domain, u32 wnd_nr,
pamu_prot |= PAACE_AP_PERMS_UPDATE;

spin_lock_irqsave(&dma_domain->domain_lock, flags);
- if (!dma_domain->win_arr) {
- pr_debug("Number of windows not configured\n");
- spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
- return -ENODEV;
- }
-
- if (wnd_nr >= dma_domain->win_cnt) {
+ 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(dma_domain->win_cnt);
+ 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->win_cnt == 1) {
- if (dma_domain->enabled) {
- pr_debug("Disable the window before updating the mapping\n");
- spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
- return -EBUSY;
- }
+ 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;
- }
+ 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];
@@ -560,22 +430,18 @@ static int handle_attach_device(struct fsl_dma_domain *dma_domain,
* for the domain. If yes, set the geometry for
* the LIODN.
*/
- if (dma_domain->win_arr) {
- u32 win_cnt = dma_domain->win_cnt > 1 ? dma_domain->win_cnt : 0;
-
- ret = pamu_set_liodn(liodn[i], dev, dma_domain,
- &domain->geometry, win_cnt);
+ ret = pamu_set_liodn(liodn[i], dev, 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;
- if (dma_domain->mapped) {
- /*
- * 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);
@@ -706,48 +572,6 @@ static int configure_domain_dma_state(struct fsl_dma_domain *dma_domain, bool en
return 0;
}

-static int fsl_pamu_set_windows(struct iommu_domain *domain, u32 w_count)
-{
- struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
- unsigned long flags;
- int ret;
-
- spin_lock_irqsave(&dma_domain->domain_lock, flags);
- /* Ensure domain is inactive i.e. DMA should be disabled for the domain */
- if (dma_domain->enabled) {
- pr_debug("Can't set geometry attributes as domain is active\n");
- spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
- return -EBUSY;
- }
-
- /*
- * Ensure we have valid window count i.e. it should be less than
- * maximum permissible limit and should be a power of two.
- */
- if (w_count > pamu_get_max_subwin_cnt() || !is_power_of_2(w_count)) {
- pr_debug("Invalid window count\n");
- spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
- return -EINVAL;
- }
-
- ret = pamu_set_domain_geometry(dma_domain, &domain->geometry,
- w_count > 1 ? w_count : 0);
- if (!ret) {
- kfree(dma_domain->win_arr);
- dma_domain->win_arr = kcalloc(w_count,
- sizeof(*dma_domain->win_arr),
- GFP_ATOMIC);
- if (!dma_domain->win_arr) {
- spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
- return -ENOMEM;
- }
- dma_domain->win_cnt = w_count;
- }
- spin_unlock_irqrestore(&dma_domain->domain_lock, flags);
-
- return ret;
-}
-
static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
enum iommu_attr attr_type, void *data)
{
@@ -761,9 +585,6 @@ static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
case DOMAIN_ATTR_FSL_PAMU_ENABLE:
ret = configure_domain_dma_state(dma_domain, *(int *)data);
break;
- case DOMAIN_ATTR_WINDOWS:
- ret = fsl_pamu_set_windows(domain, *(u32 *)data);
- break;
default:
pr_debug("Unsupported attribute type\n");
ret = -EINVAL;
diff --git a/drivers/iommu/fsl_pamu_domain.h b/drivers/iommu/fsl_pamu_domain.h
index 53d359d66fe577..d3523ee9999d83 100644
--- a/drivers/iommu/fsl_pamu_domain.h
+++ b/drivers/iommu/fsl_pamu_domain.h
@@ -17,23 +17,11 @@ struct dma_window {
};

struct fsl_dma_domain {
- /*
- * Number of windows assocaited with this domain.
- * During domain initialization, it is set to the
- * the maximum number of subwindows allowed for a LIODN.
- * Minimum value for this is 1 indicating a single PAMU
- * window, without any sub windows. Value can be set/
- * queried by set_attr/get_attr API for DOMAIN_ATTR_WINDOWS.
- * Value can only be set once the geometry has been configured.
- */
- u32 win_cnt;
/*
* win_arr contains information of the configured
- * windows for a domain. This is allocated only
- * when the number of windows for the domain are
- * set.
+ * windows for a domain.
*/
- struct dma_window *win_arr;
+ struct dma_window win_arr[1];
/* list of devices associated with the domain */
struct list_head devices;
/* dma_domain states:
diff --git a/drivers/soc/fsl/qbman/qman_portal.c b/drivers/soc/fsl/qbman/qman_portal.c
index c958e6310d3094..3d56ec4b373b4b 100644
--- a/drivers/soc/fsl/qbman/qman_portal.c
+++ b/drivers/soc/fsl/qbman/qman_portal.c
@@ -55,13 +55,6 @@ static void portal_set_cpu(struct qm_portal_config *pcfg, int cpu)
dev_err(dev, "%s(): iommu_domain_alloc() failed", __func__);
goto no_iommu;
}
- ret = iommu_domain_set_attr(pcfg->iommu_domain, DOMAIN_ATTR_WINDOWS,
- &window_count);
- if (ret < 0) {
- dev_err(dev, "%s(): iommu_domain_set_attr() = %d", __func__,
- ret);
- goto out_domain_free;
- }
stash_attr.cpu = cpu;
stash_attr.cache = PAMU_ATTR_CACHE_L1;
ret = iommu_domain_set_attr(pcfg->iommu_domain,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 52874ae164dd60..861c3558c878bf 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -109,7 +109,6 @@ enum iommu_cap {
enum iommu_attr {
DOMAIN_ATTR_GEOMETRY,
DOMAIN_ATTR_PAGING,
- DOMAIN_ATTR_WINDOWS,
DOMAIN_ATTR_FSL_PAMU_STASH,
DOMAIN_ATTR_FSL_PAMU_ENABLE,
DOMAIN_ATTR_NESTING, /* two stages of translation */
--
2.30.1