[RFC 5/5] iommu/omap: eliminate the public omap_find_iommu_device() method

From: Ohad Ben-Cohen
Date: Sun Sep 25 2011 - 07:01:48 EST

Eliminate the public omap_find_iommu_device() method, and don't
expect clients to provide the omap_iommu handle anymore.

Instead, OMAP's iommu driver should now utilize dev_archdata's private iommu
extension to be able to access the required iommu information.

Update omap3isp appropriately.

Signed-off-by: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
Cc: Hiroshi DOYU <Hiroshi.DOYU@xxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Tony Lindgren <tony@xxxxxxxxxxx>
---
arch/arm/plat-omap/include/plat/iommu.h | 5 +--
arch/arm/plat-omap/include/plat/iovmm.h | 12 +++---
drivers/iommu/omap-iommu.c | 58 ++++++++++++++-----------------
drivers/iommu/omap-iovmm.c | 31 +++++++++++------
drivers/media/video/omap3isp/isp.c | 30 +++-------------
drivers/media/video/omap3isp/isp.h | 2 -
drivers/media/video/omap3isp/ispccdc.c | 18 +++++-----
drivers/media/video/omap3isp/ispstat.c | 8 ++--
drivers/media/video/omap3isp/ispvideo.c | 4 +-
9 files changed, 74 insertions(+), 94 deletions(-)

diff --git a/arch/arm/plat-omap/include/plat/iommu.h b/arch/arm/plat-omap/include/plat/iommu.h
index fa11ee2..88be3e6 100644
--- a/arch/arm/plat-omap/include/plat/iommu.h
+++ b/arch/arm/plat-omap/include/plat/iommu.h
@@ -189,8 +189,8 @@ extern int omap_iommu_set_isr(const char *name,
void *priv),
void *isr_priv);

-extern void omap_iommu_save_ctx(struct omap_iommu *obj);
-extern void omap_iommu_restore_ctx(struct omap_iommu *obj);
+extern void omap_iommu_save_ctx(struct device *dev);
+extern void omap_iommu_restore_ctx(struct device *dev);

extern int omap_install_iommu_arch(const struct iommu_functions *ops);
extern void omap_uninstall_iommu_arch(const struct iommu_functions *ops);
@@ -202,6 +202,5 @@ extern ssize_t
omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf, ssize_t len);
extern size_t
omap_dump_tlb_entries(struct omap_iommu *obj, char *buf, ssize_t len);
-struct device *omap_find_iommu_device(const char *name);

#endif /* __MACH_IOMMU_H */
diff --git a/arch/arm/plat-omap/include/plat/iovmm.h b/arch/arm/plat-omap/include/plat/iovmm.h
index 6af1a91..498e57c 100644
--- a/arch/arm/plat-omap/include/plat/iovmm.h
+++ b/arch/arm/plat-omap/include/plat/iovmm.h
@@ -72,18 +72,18 @@ struct iovm_struct {
#define IOVMF_DA_FIXED (1 << (4 + IOVMF_SW_SHIFT))


-extern struct iovm_struct *omap_find_iovm_area(struct omap_iommu *obj, u32 da);
+extern struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da);
extern u32
-omap_iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj, u32 da,
+omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
const struct sg_table *sgt, u32 flags);
extern struct sg_table *omap_iommu_vunmap(struct iommu_domain *domain,
- struct omap_iommu *obj, u32 da);
+ struct device *dev, u32 da);
extern u32
-omap_iommu_vmalloc(struct iommu_domain *domain, struct omap_iommu *obj,
+omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev,
u32 da, size_t bytes, u32 flags);
extern void
-omap_iommu_vfree(struct iommu_domain *domain, struct omap_iommu *obj,
+omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
const u32 da);
-extern void *omap_da_to_va(struct omap_iommu *obj, u32 da);
+extern void *omap_da_to_va(struct device *dev, u32 da);

#endif /* __IOMMU_MMAP_H */
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 849a39e..eea3ee2 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -86,20 +86,24 @@ EXPORT_SYMBOL_GPL(omap_uninstall_iommu_arch);

/**
* omap_iommu_save_ctx - Save registers for pm off-mode support
- * @obj: target iommu
+ * @dev: client device
**/
-void omap_iommu_save_ctx(struct omap_iommu *obj)
+void omap_iommu_save_ctx(struct device *dev)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
+
arch_iommu->save_ctx(obj);
}
EXPORT_SYMBOL_GPL(omap_iommu_save_ctx);

/**
* omap_iommu_restore_ctx - Restore registers for pm off-mode support
- * @obj: target iommu
+ * @dev: client device
**/
-void omap_iommu_restore_ctx(struct omap_iommu *obj)
+void omap_iommu_restore_ctx(struct device *dev)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
+
arch_iommu->restore_ctx(obj);
}
EXPORT_SYMBOL_GPL(omap_iommu_restore_ctx);
@@ -815,35 +819,23 @@ static int device_match_by_alias(struct device *dev, void *data)
}

/**
- * omap_find_iommu_device() - find an omap iommu device by name
- * @name: name of the iommu device
- *
- * The generic iommu API requires the caller to provide the device
- * he wishes to attach to a certain iommu domain.
- *
- * Drivers generally should not bother with this as it should just
- * be taken care of by the DMA-API using dev_archdata.
- *
- * This function is provided as an interim solution until the latter
- * materializes, and omap3isp is fully migrated to the DMA-API.
- */
-struct device *omap_find_iommu_device(const char *name)
-{
- return driver_find_device(&omap_iommu_driver.driver, NULL,
- (void *)name,
- device_match_by_alias);
-}
-EXPORT_SYMBOL_GPL(omap_find_iommu_device);
-
-/**
* omap_iommu_attach() - attach iommu device to an iommu domain
- * @dev: target omap iommu device
+ * @name: name of target omap iommu device
* @iopgd: page table
**/
-static struct omap_iommu *omap_iommu_attach(struct device *dev, u32 *iopgd)
+static struct omap_iommu *omap_iommu_attach(const char *name, u32 *iopgd)
{
int err = -ENOMEM;
- struct omap_iommu *obj = to_iommu(dev);
+ struct device *dev;
+ struct omap_iommu *obj;
+
+ dev = driver_find_device(&omap_iommu_driver.driver, NULL,
+ (void *)name,
+ device_match_by_alias);
+ if (!dev)
+ return NULL;
+
+ obj = to_iommu(dev);

spin_lock(&obj->iommu_lock);

@@ -1064,6 +1056,7 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
struct omap_iommu_domain *omap_domain = domain->priv;
struct omap_iommu *oiommu;
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
int ret = 0;

spin_lock(&omap_domain->lock);
@@ -1076,14 +1069,14 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
}

/* get a handle to and enable the omap iommu */
- oiommu = omap_iommu_attach(dev, omap_domain->pgtable);
+ oiommu = omap_iommu_attach(arch_data->name, omap_domain->pgtable);
if (IS_ERR(oiommu)) {
ret = PTR_ERR(oiommu);
dev_err(dev, "can't get omap iommu: %d\n", ret);
goto out;
}

- omap_domain->iommu_dev = oiommu;
+ omap_domain->iommu_dev = arch_data->iommu_dev = oiommu;
oiommu->domain = domain;

/* temporary workaround */
@@ -1098,7 +1091,8 @@ static void omap_iommu_detach_dev(struct iommu_domain *domain,
struct device *dev)
{
struct omap_iommu_domain *omap_domain = domain->priv;
- struct omap_iommu *oiommu = to_iommu(dev);
+ struct omap_iommu_arch_data *arch_data = dev->archdata.iommu;
+ struct omap_iommu *oiommu = dev_to_omap_iommu(dev);

spin_lock(&omap_domain->lock);

@@ -1112,7 +1106,7 @@ static void omap_iommu_detach_dev(struct iommu_domain *domain,

omap_iommu_detach(oiommu);

- omap_domain->iommu_dev = NULL;
+ omap_domain->iommu_dev = arch_data->iommu_dev = NULL;

/* temporary workaround */
clk_disable(oiommu->clk);
diff --git a/drivers/iommu/omap-iovmm.c b/drivers/iommu/omap-iovmm.c
index f4dea5a..28ff3da 100644
--- a/drivers/iommu/omap-iovmm.c
+++ b/drivers/iommu/omap-iovmm.c
@@ -230,12 +230,14 @@ static struct iovm_struct *__find_iovm_area(struct omap_iommu *obj,

/**
* omap_find_iovm_area - find iovma which includes @da
+ * @dev: client device
* @da: iommu device virtual address
*
* Find the existing iovma starting at @da
*/
-struct iovm_struct *omap_find_iovm_area(struct omap_iommu *obj, u32 da)
+struct iovm_struct *omap_find_iovm_area(struct device *dev, u32 da)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
struct iovm_struct *area;

mutex_lock(&obj->mmap_lock);
@@ -342,14 +344,15 @@ static void free_iovm_area(struct omap_iommu *obj, struct iovm_struct *area)

/**
* omap_da_to_va - convert (d) to (v)
- * @obj: objective iommu
+ * @dev: client device
* @da: iommu device virtual address
* @va: mpu virtual address
*
* Returns mpu virtual addr which corresponds to a given device virtual addr
*/
-void *omap_da_to_va(struct omap_iommu *obj, u32 da)
+void *omap_da_to_va(struct device *dev, u32 da)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
void *va = NULL;
struct iovm_struct *area;

@@ -575,16 +578,18 @@ __iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj,

/**
* omap_iommu_vmap - (d)-(p)-(v) address mapper
- * @obj: objective iommu
+ * @domain: iommu domain
+ * @dev: client device
* @sgt: address of scatter gather table
* @flags: iovma and page property
*
* Creates 1-n-1 mapping with given @sgt and returns @da.
* All @sgt element must be io page size aligned.
*/
-u32 omap_iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj, u32 da,
+u32 omap_iommu_vmap(struct iommu_domain *domain, struct device *dev, u32 da,
const struct sg_table *sgt, u32 flags)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
size_t bytes;
void *va = NULL;

@@ -615,15 +620,17 @@ EXPORT_SYMBOL_GPL(omap_iommu_vmap);

/**
* omap_iommu_vunmap - release virtual mapping obtained by 'omap_iommu_vmap()'
- * @obj: objective iommu
+ * @domain: iommu domain
+ * @dev: client device
* @da: iommu device virtual address
*
* Free the iommu virtually contiguous memory area starting at
* @da, which was returned by 'omap_iommu_vmap()'.
*/
struct sg_table *
-omap_iommu_vunmap(struct iommu_domain *domain, struct omap_iommu *obj, u32 da)
+omap_iommu_vunmap(struct iommu_domain *domain, struct device *dev, u32 da)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
struct sg_table *sgt;
/*
* 'sgt' is allocated before 'omap_iommu_vmalloc()' is called.
@@ -640,7 +647,7 @@ EXPORT_SYMBOL_GPL(omap_iommu_vunmap);

/**
* omap_iommu_vmalloc - (d)-(p)-(v) address allocator and mapper
- * @obj: objective iommu
+ * @dev: client device
* @da: contiguous iommu virtual memory
* @bytes: allocation size
* @flags: iovma and page property
@@ -649,9 +656,10 @@ EXPORT_SYMBOL_GPL(omap_iommu_vunmap);
* @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set.
*/
u32
-omap_iommu_vmalloc(struct iommu_domain *domain, struct omap_iommu *obj, u32 da,
+omap_iommu_vmalloc(struct iommu_domain *domain, struct device *dev, u32 da,
size_t bytes, u32 flags)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
void *va;
struct sg_table *sgt;

@@ -691,15 +699,16 @@ EXPORT_SYMBOL_GPL(omap_iommu_vmalloc);

/**
* omap_iommu_vfree - release memory allocated by 'omap_iommu_vmalloc()'
- * @obj: objective iommu
+ * @dev: client device
* @da: iommu device virtual address
*
* Frees the iommu virtually continuous memory area starting at
* @da, as obtained from 'omap_iommu_vmalloc()'.
*/
-void omap_iommu_vfree(struct iommu_domain *domain, struct omap_iommu *obj,
+void omap_iommu_vfree(struct iommu_domain *domain, struct device *dev,
const u32 da)
{
+ struct omap_iommu *obj = dev_to_omap_iommu(dev);
struct sg_table *sgt;

sgt = unmap_vm_area(domain, obj, da, vfree,
diff --git a/drivers/media/video/omap3isp/isp.c b/drivers/media/video/omap3isp/isp.c
index a4baa61..1cb3a68 100644
--- a/drivers/media/video/omap3isp/isp.c
+++ b/drivers/media/video/omap3isp/isp.c
@@ -80,13 +80,6 @@
#include "isph3a.h"
#include "isphist.h"

-/*
- * this is provided as an interim solution until omap3isp doesn't need
- * any omap-specific iommu API
- */
-#define to_iommu(dev) \
- (struct omap_iommu *)platform_get_drvdata(to_platform_device(dev))
-
static unsigned int autoidle;
module_param(autoidle, int, 0444);
MODULE_PARM_DESC(autoidle, "Enable OMAP3ISP AUTOIDLE support");
@@ -1114,8 +1107,7 @@ isp_restore_context(struct isp_device *isp, struct isp_reg *reg_list)
static void isp_save_ctx(struct isp_device *isp)
{
isp_save_context(isp, isp_reg_list);
- if (isp->iommu)
- omap_iommu_save_ctx(isp->iommu);
+ omap_iommu_save_ctx(isp->dev);
}

/*
@@ -1128,8 +1120,7 @@ static void isp_save_ctx(struct isp_device *isp)
static void isp_restore_ctx(struct isp_device *isp)
{
isp_restore_context(isp, isp_reg_list);
- if (isp->iommu)
- omap_iommu_restore_ctx(isp->iommu);
+ omap_iommu_restore_ctx(isp->dev);
omap3isp_ccdc_restore_context(isp);
omap3isp_preview_restore_context(isp);
}
@@ -1982,7 +1973,7 @@ static int isp_remove(struct platform_device *pdev)
isp_cleanup_modules(isp);

omap3isp_get(isp);
- iommu_detach_device(isp->domain, isp->iommu_dev);
+ iommu_detach_device(isp->domain, &pdev->dev);
iommu_domain_free(isp->domain);
omap3isp_put(isp);

@@ -2130,17 +2121,6 @@ static int isp_probe(struct platform_device *pdev)
}
}

- /* IOMMU */
- isp->iommu_dev = omap_find_iommu_device("isp");
- if (!isp->iommu_dev) {
- dev_err(isp->dev, "omap_find_iommu_device failed\n");
- ret = -ENODEV;
- goto error_isp;
- }
-
- /* to be removed once iommu migration is complete */
- isp->iommu = to_iommu(isp->iommu_dev);
-
isp->domain = iommu_domain_alloc();
if (!isp->domain) {
dev_err(isp->dev, "can't alloc iommu domain\n");
@@ -2148,7 +2128,7 @@ static int isp_probe(struct platform_device *pdev)
goto error_isp;
}

- ret = iommu_attach_device(isp->domain, isp->iommu_dev);
+ ret = iommu_attach_device(isp->domain, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "can't attach iommu device: %d\n", ret);
goto free_domain;
@@ -2187,7 +2167,7 @@ error_modules:
error_irq:
free_irq(isp->irq_num, isp);
detach_dev:
- iommu_detach_device(isp->domain, isp->iommu_dev);
+ iommu_detach_device(isp->domain, &pdev->dev);
free_domain:
iommu_domain_free(isp->domain);
error_isp:
diff --git a/drivers/media/video/omap3isp/isp.h b/drivers/media/video/omap3isp/isp.h
index 81fdd85..60e0e29 100644
--- a/drivers/media/video/omap3isp/isp.h
+++ b/drivers/media/video/omap3isp/isp.h
@@ -295,9 +295,7 @@ struct isp_device {
unsigned int sbl_resources;
unsigned int subclk_resources;

- struct omap_iommu *iommu;
struct iommu_domain *domain;
- struct device *iommu_dev;

struct isp_platform_callback platform_cb;
};
diff --git a/drivers/media/video/omap3isp/ispccdc.c b/drivers/media/video/omap3isp/ispccdc.c
index 9891dde..6b4c11e 100644
--- a/drivers/media/video/omap3isp/ispccdc.c
+++ b/drivers/media/video/omap3isp/ispccdc.c
@@ -365,7 +365,7 @@ static void ccdc_lsc_free_request(struct isp_ccdc_device *ccdc,
dma_unmap_sg(isp->dev, req->iovm->sgt->sgl,
req->iovm->sgt->nents, DMA_TO_DEVICE);
if (req->table)
- omap_iommu_vfree(isp->domain, isp->iommu, req->table);
+ omap_iommu_vfree(isp->domain, isp->dev, req->table);
kfree(req);
}

@@ -437,7 +437,7 @@ static int ccdc_lsc_config(struct isp_ccdc_device *ccdc,

req->enable = 1;

- req->table = omap_iommu_vmalloc(isp->domain, isp->iommu, 0,
+ req->table = omap_iommu_vmalloc(isp->domain, isp->dev, 0,
req->config.size, IOMMU_FLAG);
if (IS_ERR_VALUE(req->table)) {
req->table = 0;
@@ -445,7 +445,7 @@ static int ccdc_lsc_config(struct isp_ccdc_device *ccdc,
goto done;
}

- req->iovm = omap_find_iovm_area(isp->iommu, req->table);
+ req->iovm = omap_find_iovm_area(isp->dev, req->table);
if (req->iovm == NULL) {
ret = -ENOMEM;
goto done;
@@ -461,7 +461,7 @@ static int ccdc_lsc_config(struct isp_ccdc_device *ccdc,
dma_sync_sg_for_cpu(isp->dev, req->iovm->sgt->sgl,
req->iovm->sgt->nents, DMA_TO_DEVICE);

- table = omap_da_to_va(isp->iommu, req->table);
+ table = omap_da_to_va(isp->dev, req->table);
if (copy_from_user(table, config->lsc, req->config.size)) {
ret = -EFAULT;
goto done;
@@ -733,15 +733,15 @@ static int ccdc_config(struct isp_ccdc_device *ccdc,
* already done by omap_iommu_vmalloc().
*/
size = ccdc->fpc.fpnum * 4;
- table_new = omap_iommu_vmalloc(isp->domain, isp->iommu,
+ table_new = omap_iommu_vmalloc(isp->domain, isp->dev,
0, size, IOMMU_FLAG);
if (IS_ERR_VALUE(table_new))
return -ENOMEM;

- if (copy_from_user(omap_da_to_va(isp->iommu, table_new),
+ if (copy_from_user(omap_da_to_va(isp->dev, table_new),
(__force void __user *)
ccdc->fpc.fpcaddr, size)) {
- omap_iommu_vfree(isp->domain, isp->iommu,
+ omap_iommu_vfree(isp->domain, isp->dev,
table_new);
return -EFAULT;
}
@@ -752,7 +752,7 @@ static int ccdc_config(struct isp_ccdc_device *ccdc,

ccdc_configure_fpc(ccdc);
if (table_old != 0)
- omap_iommu_vfree(isp->domain, isp->iommu, table_old);
+ omap_iommu_vfree(isp->domain, isp->dev, table_old);
}

return ccdc_lsc_config(ccdc, ccdc_struct);
@@ -2287,5 +2287,5 @@ void omap3isp_ccdc_cleanup(struct isp_device *isp)
ccdc_lsc_free_queue(ccdc, &ccdc->lsc.free_queue);

if (ccdc->fpc.fpcaddr != 0)
- omap_iommu_vfree(isp->domain, isp->iommu, ccdc->fpc.fpcaddr);
+ omap_iommu_vfree(isp->domain, isp->dev, ccdc->fpc.fpcaddr);
}
diff --git a/drivers/media/video/omap3isp/ispstat.c b/drivers/media/video/omap3isp/ispstat.c
index 7329055..036fc93 100644
--- a/drivers/media/video/omap3isp/ispstat.c
+++ b/drivers/media/video/omap3isp/ispstat.c
@@ -366,7 +366,7 @@ static void isp_stat_bufs_free(struct ispstat *stat)
dma_unmap_sg(isp->dev, buf->iovm->sgt->sgl,
buf->iovm->sgt->nents,
DMA_FROM_DEVICE);
- omap_iommu_vfree(isp->domain, isp->iommu,
+ omap_iommu_vfree(isp->domain, isp->dev,
buf->iommu_addr);
} else {
if (!buf->virt_addr)
@@ -400,7 +400,7 @@ static int isp_stat_bufs_alloc_iommu(struct ispstat *stat, unsigned int size)
struct iovm_struct *iovm;

WARN_ON(buf->dma_addr);
- buf->iommu_addr = omap_iommu_vmalloc(isp->domain, isp->iommu, 0,
+ buf->iommu_addr = omap_iommu_vmalloc(isp->domain, isp->dev, 0,
size, IOMMU_FLAG);
if (IS_ERR((void *)buf->iommu_addr)) {
dev_err(stat->isp->dev,
@@ -410,7 +410,7 @@ static int isp_stat_bufs_alloc_iommu(struct ispstat *stat, unsigned int size)
return -ENOMEM;
}

- iovm = omap_find_iovm_area(isp->iommu, buf->iommu_addr);
+ iovm = omap_find_iovm_area(isp->dev, buf->iommu_addr);
if (!iovm ||
!dma_map_sg(isp->dev, iovm->sgt->sgl, iovm->sgt->nents,
DMA_FROM_DEVICE)) {
@@ -419,7 +419,7 @@ static int isp_stat_bufs_alloc_iommu(struct ispstat *stat, unsigned int size)
}
buf->iovm = iovm;

- buf->virt_addr = omap_da_to_va(stat->isp->iommu,
+ buf->virt_addr = omap_da_to_va(stat->isp->dev,
(u32)buf->iommu_addr);
buf->empty = 1;
dev_dbg(stat->isp->dev, "%s: buffer[%d] allocated."
diff --git a/drivers/media/video/omap3isp/ispvideo.c b/drivers/media/video/omap3isp/ispvideo.c
index 912ac07..6d1d55b 100644
--- a/drivers/media/video/omap3isp/ispvideo.c
+++ b/drivers/media/video/omap3isp/ispvideo.c
@@ -446,7 +446,7 @@ ispmmu_vmap(struct isp_device *isp, const struct scatterlist *sglist, int sglen)
sgt->nents = sglen;
sgt->orig_nents = sglen;

- da = omap_iommu_vmap(isp->domain, isp->iommu, 0, sgt, IOMMU_FLAG);
+ da = omap_iommu_vmap(isp->domain, isp->dev, 0, sgt, IOMMU_FLAG);
if (IS_ERR_VALUE(da))
kfree(sgt);

@@ -462,7 +462,7 @@ static void ispmmu_vunmap(struct isp_device *isp, dma_addr_t da)
{
struct sg_table *sgt;

- sgt = omap_iommu_vunmap(isp->domain, isp->iommu, (u32)da);
+ sgt = omap_iommu_vunmap(isp->domain, isp->dev, (u32)da);
kfree(sgt);
}

--
1.7.4.1

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