Re: [PATCH v3 07/15] firmware: qcom: scm: make qcom_scm_assign_mem() use the TZ allocator

[Andrew Halaney]

On Mon, Oct 09, 2023 at 05:34:19PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
> 
> Let's use the new TZ memory allocator to obtain a buffer for this call
> instead of using dma_alloc_coherent().
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
> ---
>  drivers/firmware/qcom/qcom_scm.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 71e98b666391..754f6056b99f 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -4,6 +4,7 @@
>   */
>  
>  #include <linux/arm-smccc.h>
> +#include <linux/cleanup.h>
>  #include <linux/clk.h>
>  #include <linux/completion.h>
>  #include <linux/cpumask.h>
> @@ -998,14 +999,13 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
>  	struct qcom_scm_mem_map_info *mem_to_map;
>  	phys_addr_t mem_to_map_phys;
>  	phys_addr_t dest_phys;
> -	dma_addr_t ptr_phys;
> +	phys_addr_t ptr_phys;
>  	size_t mem_to_map_sz;
>  	size_t dest_sz;
>  	size_t src_sz;
>  	size_t ptr_sz;
>  	int next_vm;
>  	__le32 *src;
> -	void *ptr;

nit: couldn't you keep this up here?

Otherwise,

Reviewed-by: Andrew Halaney <ahalaney@xxxxxxxxxx>

>  	int ret, i, b;
>  	u64 srcvm_bits = *srcvm;
>  
> @@ -1015,10 +1015,13 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
>  	ptr_sz = ALIGN(src_sz, SZ_64) + ALIGN(mem_to_map_sz, SZ_64) +
>  			ALIGN(dest_sz, SZ_64);
>  
> -	ptr = dma_alloc_coherent(__scm->dev, ptr_sz, &ptr_phys, GFP_KERNEL);
> +	void *ptr __free(qcom_tzmem) = qcom_tzmem_alloc(__scm->mempool,
> +							ptr_sz, GFP_KERNEL);
>  	if (!ptr)
>  		return -ENOMEM;
>  
> +	ptr_phys = qcom_tzmem_to_phys(ptr);
> +
>  	/* Fill source vmid detail */
>  	src = ptr;
>  	i = 0;
> @@ -1047,7 +1050,6 @@ int qcom_scm_assign_mem(phys_addr_t mem_addr, size_t mem_sz,
>  
>  	ret = __qcom_scm_assign_mem(__scm->dev, mem_to_map_phys, mem_to_map_sz,
>  				    ptr_phys, src_sz, dest_phys, dest_sz);
> -	dma_free_coherent(__scm->dev, ptr_sz, ptr, ptr_phys);
>  	if (ret) {
>  		dev_err(__scm->dev,
>  			"Assign memory protection call failed %d\n", ret);
> -- 
> 2.39.2
>