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Subject: media: venus: don't abuse dma_alloc for non-DMA allocations
Author:  Stanimir Varbanov <stanimir.varba...@linaro.org>
Date:    Wed Jul 19 07:51:37 2017 -0400

In venus_boot(), we pass a pointer to a phys_addr_t
into dmam_alloc_coherent, which the compiler warns about:

platform/qcom/venus/firmware.c: In function 'venus_boot':
platform/qcom/venus/firmware.c:63:49: error: passing argument 3 of 
'dmam_alloc_coherent' from incompatible pointer type 
[-Werror=incompatible-pointer-types]

To avoid the error refactor venus_boot function by discard
dma_alloc_coherent invocation because we don't want to map the
memory for the device.  Something more, the usage of
DMA mapping API is actually wrong and the current
implementation relies on several bugs in DMA mapping code.
When these bugs are fixed that will break firmware loading,
so fix this now to avoid future troubles.

The meaning of venus_boot is to copy the content of the
firmware buffer into reserved (and memblock removed)
block of memory and pass that physical address to the
trusted zone for authentication and mapping through iommu
form the secure world. After iommu mapping is done the iova
is passed as ane entry point to the remote processor.

After this change memory-region property is parsed manually
and the physical address is memremap to CPU, call mdt_load to
load firmware segments into proper places and unmap
reserved memory.

Fixes: af2c3834c8ca ("[media] media: venus: adding core part and helper 
functions")

Signed-off-by: Stanimir Varbanov <stanimir.varba...@linaro.org>
Reviewed-by: Arnd Bergmann <a...@arndb.de>
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/platform/qcom/venus/core.c     | 10 ++--
 drivers/media/platform/qcom/venus/core.h     |  1 -
 drivers/media/platform/qcom/venus/firmware.c | 74 ++++++++++++----------------
 drivers/media/platform/qcom/venus/firmware.h |  5 +-
 4 files changed, 39 insertions(+), 51 deletions(-)

---

diff --git a/drivers/media/platform/qcom/venus/core.c 
b/drivers/media/platform/qcom/venus/core.c
index 47f79637938c..41eef376eb2d 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -76,7 +76,7 @@ static void venus_sys_error_handler(struct work_struct *work)
        hfi_core_deinit(core, true);
        hfi_destroy(core);
        mutex_lock(&core->lock);
-       venus_shutdown(&core->dev_fw);
+       venus_shutdown(core->dev);
 
        pm_runtime_put_sync(core->dev);
 
@@ -84,7 +84,7 @@ static void venus_sys_error_handler(struct work_struct *work)
 
        pm_runtime_get_sync(core->dev);
 
-       ret |= venus_boot(core->dev, &core->dev_fw, core->res->fwname);
+       ret |= venus_boot(core->dev, core->res->fwname);
 
        ret |= hfi_core_resume(core, true);
 
@@ -207,7 +207,7 @@ static int venus_probe(struct platform_device *pdev)
        if (ret < 0)
                goto err_runtime_disable;
 
-       ret = venus_boot(dev, &core->dev_fw, core->res->fwname);
+       ret = venus_boot(dev, core->res->fwname);
        if (ret)
                goto err_runtime_disable;
 
@@ -238,7 +238,7 @@ err_dev_unregister:
 err_core_deinit:
        hfi_core_deinit(core, false);
 err_venus_shutdown:
-       venus_shutdown(&core->dev_fw);
+       venus_shutdown(dev);
 err_runtime_disable:
        pm_runtime_set_suspended(dev);
        pm_runtime_disable(dev);
@@ -259,7 +259,7 @@ static int venus_remove(struct platform_device *pdev)
        WARN_ON(ret);
 
        hfi_destroy(core);
-       venus_shutdown(&core->dev_fw);
+       venus_shutdown(dev);
        of_platform_depopulate(dev);
 
        pm_runtime_put_sync(dev);
diff --git a/drivers/media/platform/qcom/venus/core.h 
b/drivers/media/platform/qcom/venus/core.h
index e542700eee32..cba092bcb76d 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -101,7 +101,6 @@ struct venus_core {
        struct device *dev;
        struct device *dev_dec;
        struct device *dev_enc;
-       struct device dev_fw;
        struct mutex lock;
        struct list_head instances;
        atomic_t insts_count;
diff --git a/drivers/media/platform/qcom/venus/firmware.c 
b/drivers/media/platform/qcom/venus/firmware.c
index 1ede92300dd6..521d4b36c090 100644
--- a/drivers/media/platform/qcom/venus/firmware.c
+++ b/drivers/media/platform/qcom/venus/firmware.c
@@ -12,29 +12,27 @@
  *
  */
 
-#include <linux/dma-mapping.h>
+#include <linux/device.h>
 #include <linux/firmware.h>
 #include <linux/kernel.h>
+#include <linux/io.h>
 #include <linux/of.h>
-#include <linux/of_reserved_mem.h>
-#include <linux/slab.h>
+#include <linux/of_address.h>
 #include <linux/qcom_scm.h>
+#include <linux/sizes.h>
 #include <linux/soc/qcom/mdt_loader.h>
 
 #include "firmware.h"
 
 #define VENUS_PAS_ID                   9
-#define VENUS_FW_MEM_SIZE              SZ_8M
+#define VENUS_FW_MEM_SIZE              (6 * SZ_1M)
 
-static void device_release_dummy(struct device *dev)
-{
-       of_reserved_mem_device_release(dev);
-}
-
-int venus_boot(struct device *parent, struct device *fw_dev, const char 
*fwname)
+int venus_boot(struct device *dev, const char *fwname)
 {
        const struct firmware *mdt;
+       struct device_node *node;
        phys_addr_t mem_phys;
+       struct resource r;
        ssize_t fw_size;
        size_t mem_size;
        void *mem_va;
@@ -43,66 +41,58 @@ int venus_boot(struct device *parent, struct device 
*fw_dev, const char *fwname)
        if (!IS_ENABLED(CONFIG_QCOM_MDT_LOADER) || !qcom_scm_is_available())
                return -EPROBE_DEFER;
 
-       fw_dev->parent = parent;
-       fw_dev->release = device_release_dummy;
+       node = of_parse_phandle(dev->of_node, "memory-region", 0);
+       if (!node) {
+               dev_err(dev, "no memory-region specified\n");
+               return -EINVAL;
+       }
 
-       ret = dev_set_name(fw_dev, "%s:%s", dev_name(parent), "firmware");
+       ret = of_address_to_resource(node, 0, &r);
        if (ret)
                return ret;
 
-       ret = device_register(fw_dev);
-       if (ret < 0)
-               return ret;
+       mem_phys = r.start;
+       mem_size = resource_size(&r);
 
-       ret = of_reserved_mem_device_init_by_idx(fw_dev, parent->of_node, 0);
-       if (ret)
-               goto err_unreg_device;
+       if (mem_size < VENUS_FW_MEM_SIZE)
+               return -EINVAL;
 
-       mem_size = VENUS_FW_MEM_SIZE;
-
-       mem_va = dmam_alloc_coherent(fw_dev, mem_size, &mem_phys, GFP_KERNEL);
+       mem_va = memremap(r.start, mem_size, MEMREMAP_WC);
        if (!mem_va) {
-               ret = -ENOMEM;
-               goto err_unreg_device;
+               dev_err(dev, "unable to map memory region: %pa+%zx\n",
+                       &r.start, mem_size);
+               return -ENOMEM;
        }
 
-       ret = request_firmware(&mdt, fwname, fw_dev);
+       ret = request_firmware(&mdt, fwname, dev);
        if (ret < 0)
-               goto err_unreg_device;
+               goto err_unmap;
 
        fw_size = qcom_mdt_get_size(mdt);
        if (fw_size < 0) {
                ret = fw_size;
                release_firmware(mdt);
-               goto err_unreg_device;
+               goto err_unmap;
        }
 
-       ret = qcom_mdt_load(fw_dev, mdt, fwname, VENUS_PAS_ID, mem_va, mem_phys,
+       ret = qcom_mdt_load(dev, mdt, fwname, VENUS_PAS_ID, mem_va, mem_phys,
                            mem_size);
 
        release_firmware(mdt);
 
        if (ret)
-               goto err_unreg_device;
+               goto err_unmap;
 
        ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
        if (ret)
-               goto err_unreg_device;
-
-       return 0;
+               goto err_unmap;
 
-err_unreg_device:
-       device_unregister(fw_dev);
+err_unmap:
+       memunmap(mem_va);
        return ret;
 }
 
-int venus_shutdown(struct device *fw_dev)
+int venus_shutdown(struct device *dev)
 {
-       int ret;
-
-       ret = qcom_scm_pas_shutdown(VENUS_PAS_ID);
-       device_unregister(fw_dev);
-       memset(fw_dev, 0, sizeof(*fw_dev));
-
-       return ret;
+       return qcom_scm_pas_shutdown(VENUS_PAS_ID);
 }
diff --git a/drivers/media/platform/qcom/venus/firmware.h 
b/drivers/media/platform/qcom/venus/firmware.h
index f81a98979798..428efb56d339 100644
--- a/drivers/media/platform/qcom/venus/firmware.h
+++ b/drivers/media/platform/qcom/venus/firmware.h
@@ -16,8 +16,7 @@
 
 struct device;
 
-int venus_boot(struct device *parent, struct device *fw_dev,
-              const char *fwname);
-int venus_shutdown(struct device *fw_dev);
+int venus_boot(struct device *dev, const char *fwname);
+int venus_shutdown(struct device *dev);
 
 #endif

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