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Give diagnostic aid to callers of 'dma_addr'

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If the platform driver lacks the 'managing_system="yes"' attribute,
requests for DMA addresses return 0. This patch is meant to help
diagnosing such configuration issues.

Issue #2243
This commit is contained in:
Norman Feske 2022-02-03 15:47:29 +01:00
parent cbe3e49c7f
commit 7e26d3ef3f
1 changed files with 11 additions and 2 deletions
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13
repos/os/include/platform_session/client.h
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@ -15,6 +15,7 @@
#define _INCLUDE__PLATFORM_SESSION__CLIENT_H_
#include <base/rpc_client.h>
#include <base/log.h>
#include <platform_session/capability.h>
namespace Platform { struct Client; }
@ -43,8 +44,16 @@ struct Platform::Client : Genode::Rpc_client<Session>
void free_dma_buffer(Ram_dataspace_capability cap) override {
call<Rpc_free_dma_buffer>(cap); }
addr_t dma_addr(Ram_dataspace_capability cap) override {
return call<Rpc_dma_addr>(cap); }
addr_t dma_addr(Ram_dataspace_capability cap) override
{
addr_t const result = call<Rpc_dma_addr>(cap);
/* the platform driver may lack the 'managing_system' role */
if (!result)
warning("unable to obtain DMA address from platform driver");
return result;
}
};
#endif /* _INCLUDE__PLATFORM_SESSION__CLIENT_H_ */