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Subject[PATCH v4 3/6] staging: tidspbridge: mapping support when SG_CHAIN is not defined
Date
If ARCH_HAS_SG_CHAIN is not defined a scatter-gather table can hold a
fixed number of entries, otherwise it results in a panic when
allocating bigger tables.

Use generic allocator to manage the mapped memory in such cases and
ignore iovmm functions.

Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>
---
drivers/staging/tidspbridge/Kconfig | 1 +
drivers/staging/tidspbridge/core/tiomap3430.c | 94 +++++++++++++++++++-
.../tidspbridge/include/dspbridge/dspdefs.h | 3 +-
drivers/staging/tidspbridge/rmgr/proc.c | 3 +-
4 files changed, 96 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/tidspbridge/Kconfig b/drivers/staging/tidspbridge/Kconfig
index 19b1b76..7a9d539 100644
--- a/drivers/staging/tidspbridge/Kconfig
+++ b/drivers/staging/tidspbridge/Kconfig
@@ -8,6 +8,7 @@ menuconfig TIDSPBRIDGE
select OMAP_MBOX_FWK
select OMAP_IOMMU
select OMAP_IOMMU_IVA2
+ select GENERIC_ALLOCATOR
help
DSP/BIOS Bridge is designed for platforms that contain a GPP and
one or more attached DSPs. The GPP is considered the master or
diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c b/drivers/staging/tidspbridge/core/tiomap3430.c
index 1ca50d9..692a456 100644
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -23,6 +23,7 @@
#include <dspbridge/host_os.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
+#include <linux/genalloc.h>

/* ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/dbdefs.h>
@@ -114,7 +115,8 @@ static int bridge_brd_mem_map(struct bridge_dev_context *dev_ctxt,
u32 ul_mpu_addr, u32 virt_addr,
u32 ul_num_bytes, struct page **mapped_pages);
static int bridge_brd_mem_un_map(struct bridge_dev_context *dev_ctxt,
- u32 da);
+ u32 da, size_t size,
+ struct page **usr_pgs);
static int bridge_dev_create(struct bridge_dev_context
**dev_cntxt,
struct dev_object *hdev_obj,
@@ -229,6 +231,27 @@ static struct notifier_block dsp_mbox_notifier = {
.notifier_call = io_mbox_msg,
};

+#ifndef ARCH_HAS_SG_CHAIN
+static struct gen_pool *dmm_pool;
+
+static inline u32 dsptlb_init_entry(struct iotlb_entry *e, u32 da, u32 pa,
+ u32 pgsz)
+{
+ memset(e, 0, sizeof(*e));
+
+ e->da = da;
+ e->pa = pa;
+ e->valid = 1;
+ e->pgsz = MMU_CAM_PGSZ_4K;
+ e->pgsz = pgsz & MMU_CAM_PGSZ_MASK;
+ e->endian = MMU_RAM_ENDIAN_LITTLE;
+ e->elsz = MMU_RAM_ELSZ_32;
+ e->mixed = 0;
+
+ return iopgsz_to_bytes(e->pgsz);
+}
+#endif /* !ARCH_HAS_SG_CHAIN */
+
static inline void flush_all(struct bridge_dev_context *dev_context)
{
if (dev_context->brd_state == BRD_DSP_HIBERNATION ||
@@ -463,6 +486,27 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
dev_context->dsp_mmu = NULL;
return PTR_ERR(mmu);
}
+#ifndef ARCH_HAS_SG_CHAIN
+ else {
+ u32 start;
+
+ if (dmm_pool) {
+ gen_pool_destroy(dmm_pool);
+ dmm_pool = NULL;
+ }
+
+ dmm_pool = gen_pool_create(PAGE_SHIFT, -1);
+ if (!dmm_pool) {
+ iommu_put(mmu);
+ dev_context->dsp_mmu = NULL;
+ return -ENOMEM;
+ }
+
+ sm_sg = &dev_context->sh_s;
+ start = sm_sg->seg1_da + sm_sg->seg1_size;
+ gen_pool_add(dmm_pool, start, CONFIG_TIDSPBRIDGE_DMM_SIZE, -1);
+ }
+#endif

dev_context->dsp_mmu = mmu;
mmu->isr = mmu_fault_isr;
@@ -741,6 +785,12 @@ static int bridge_brd_stop(struct bridge_dev_context *dev_ctxt)
iommu_kunmap(dev_context->dsp_mmu, dev_context->sh_s.seg0_da);
iommu_put(dev_context->dsp_mmu);
dev_context->dsp_mmu = NULL;
+#ifndef ARCH_HAS_SG_CHAIN
+ if (dmm_pool) {
+ gen_pool_destroy(dmm_pool);
+ dmm_pool = NULL;
+ }
+#endif
}

/* Reset IVA IOMMU */
@@ -1194,8 +1244,13 @@ static int bridge_brd_mem_map(struct bridge_dev_context *dev_ctx,
struct iommu *mmu = dev_ctx->dsp_mmu;
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
+#ifndef ARCH_HAS_SG_CHAIN
+ u32 pa, addr;
+ struct iotlb_entry e;
+#else
struct sg_table *sgt;
struct scatterlist *sg;
+#endif

if (!size || !usr_pgs)
return -EINVAL;
@@ -1231,6 +1286,23 @@ static int bridge_brd_mem_map(struct bridge_dev_context *dev_ctx,
goto err_pages;
}

+#ifndef ARCH_HAS_SG_CHAIN
+ da = gen_pool_alloc(dmm_pool, size);
+ if (!da) {
+ res = -ENOMEM;
+ goto err_pages;
+ }
+
+ wake_dsp(dev_ctx, NULL);
+
+ for (i = 0, addr = da; i < pages; i++, addr += PAGE_SIZE) {
+ pa = page_to_phys(usr_pgs[i]);
+ dsptlb_init_entry(&e, addr, pa, MMU_CAM_PGSZ_4K);
+ iopgtable_store_entry(mmu, &e);
+ }
+
+ return da;
+#else
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt) {
res = -ENOMEM;
@@ -1257,6 +1329,7 @@ static int bridge_brd_mem_map(struct bridge_dev_context *dev_ctx,
err_sg:
kfree(sgt);
i = pages;
+#endif /* ARCH_HAS_SG_CHAIN */
err_pages:
while (i--)
put_page(usr_pgs[i]);
@@ -1271,9 +1344,23 @@ err_pages:
* So, instead of looking up the PTE address for every 4K block,
* we clear consecutive PTEs until we unmap all the bytes
*/
-static int bridge_brd_mem_un_map(struct bridge_dev_context *dev_ctx, u32 da)
+static int bridge_brd_mem_un_map(struct bridge_dev_context *dev_ctx, u32 da,
+ size_t size, struct page **usr_pgs)
{
- unsigned i;
+ unsigned i = 0;
+#ifndef ARCH_HAS_SG_CHAIN
+ gen_pool_free(dmm_pool, da, size);
+
+ wake_dsp(dev_ctx, NULL);
+
+ while (size > 0) {
+ size_t bytes;
+ bytes = iopgtable_clear_entry(dev_ctx->dsp_mmu, da);
+ size -= bytes;
+ da += bytes;
+ put_page(usr_pgs[i++]);
+ }
+#else
struct sg_table *sgt;
struct scatterlist *sg;

@@ -1288,6 +1375,7 @@ static int bridge_brd_mem_un_map(struct bridge_dev_context *dev_ctx, u32 da)

sg_free_table(sgt);
kfree(sgt);
+#endif /* ARCH_HAS_SG_CHAIN */

return 0;
}
diff --git a/drivers/staging/tidspbridge/include/dspbridge/dspdefs.h b/drivers/staging/tidspbridge/include/dspbridge/dspdefs.h
index 48f91c9..e052bba 100644
--- a/drivers/staging/tidspbridge/include/dspbridge/dspdefs.h
+++ b/drivers/staging/tidspbridge/include/dspbridge/dspdefs.h
@@ -194,7 +194,8 @@ typedef int(*fxn_brd_memmap) (struct bridge_dev_context
*/
typedef int(*fxn_brd_memunmap) (struct bridge_dev_context
* dev_ctxt,
- u32 da);
+ u32 da, size_t size,
+ struct page **usr_pgs);

/*
* ======== bridge_brd_stop ========
diff --git a/drivers/staging/tidspbridge/rmgr/proc.c b/drivers/staging/tidspbridge/rmgr/proc.c
index 9049df8..ce57279 100644
--- a/drivers/staging/tidspbridge/rmgr/proc.c
+++ b/drivers/staging/tidspbridge/rmgr/proc.c
@@ -1731,7 +1731,8 @@ int proc_un_map(void *hprocessor, void *map_addr,

/* Remove mapping from the page tables. */
status = (*p_proc_object->intf_fxns->brd_mem_un_map)
- (p_proc_object->bridge_context, va_align);
+ (p_proc_object->bridge_context, va_align, dmo->size,
+ dmo->pages);
if (status)
goto unmap_failed;

--
1.7.1


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