On 5/29/2023 11:46 PM, Stephan Gerhold wrote: > Reserved memory can be either looked up using the generic function > of_address_to_resource() or using the special of_reserved_mem_lookup(). > The latter has the advantage that it ensures that the referenced memory > region was really reserved and is not e.g. status = "disabled". > > of_reserved_mem also supports allocating reserved memory dynamically at > boot time. This works only when using of_reserved_mem_lookup() since > there won't be a fixed address in the device tree. > > Switch the code to use of_reserved_mem_lookup(). There is no functional > difference for static reserved memory allocations. > > Signed-off-by: Stephan Gerhold <stephan@xxxxxxxxxxx> Reviewed-by: Vikash Garodia <quic_vgarodia@xxxxxxxxxxx> > --- > See e.g. [1] for an example of dynamically allocated reserved memory. > (This patch does *not* depend on [1] and is useful without as well...) > > [1]: https://lore.kernel.org/linux-arm-msm/20230510-dt-resv-bottom-up-v1-5-3bf68873dbed@xxxxxxxxxxx/ > --- > drivers/media/platform/qcom/venus/firmware.c | 24 +++++++++++++----------- > 1 file changed, 13 insertions(+), 11 deletions(-) > > diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c > index cfb11c551167..2e7ffdaff7b2 100644 > --- a/drivers/media/platform/qcom/venus/firmware.c > +++ b/drivers/media/platform/qcom/venus/firmware.c > @@ -10,6 +10,7 @@ > #include <linux/io.h> > #include <linux/of.h> > #include <linux/of_address.h> > +#include <linux/of_reserved_mem.h> > #include <linux/platform_device.h> > #include <linux/of_device.h> > #include <linux/firmware/qcom/qcom_scm.h> > @@ -82,9 +83,9 @@ static int venus_load_fw(struct venus_core *core, const char *fwname, > phys_addr_t *mem_phys, size_t *mem_size) > { > const struct firmware *mdt; > + struct reserved_mem *rmem; > struct device_node *node; > struct device *dev; > - struct resource r; > ssize_t fw_size; > void *mem_va; > int ret; > @@ -99,13 +100,16 @@ static int venus_load_fw(struct venus_core *core, const char *fwname, > return -EINVAL; > } > > - ret = of_address_to_resource(node, 0, &r); > - if (ret) > - goto err_put_node; > + rmem = of_reserved_mem_lookup(node); > + of_node_put(node); > + if (!rmem) { > + dev_err(dev, "failed to lookup reserved memory-region\n"); > + return -EINVAL; > + } > > ret = request_firmware(&mdt, fwname, dev); > if (ret < 0) > - goto err_put_node; > + return ret; > > fw_size = qcom_mdt_get_size(mdt); > if (fw_size < 0) { > @@ -113,17 +117,17 @@ static int venus_load_fw(struct venus_core *core, const char *fwname, > goto err_release_fw; > } > > - *mem_phys = r.start; > - *mem_size = resource_size(&r); > + *mem_phys = rmem->base; > + *mem_size = rmem->size; > > if (*mem_size < fw_size || fw_size > VENUS_FW_MEM_SIZE) { > ret = -EINVAL; > goto err_release_fw; > } > > - mem_va = memremap(r.start, *mem_size, MEMREMAP_WC); > + mem_va = memremap(*mem_phys, *mem_size, MEMREMAP_WC); > if (!mem_va) { > - dev_err(dev, "unable to map memory region: %pR\n", &r); > + dev_err(dev, "unable to map memory region %pa size %#zx\n", mem_phys, *mem_size); > ret = -ENOMEM; > goto err_release_fw; > } > @@ -138,8 +142,6 @@ static int venus_load_fw(struct venus_core *core, const char *fwname, > memunmap(mem_va); > err_release_fw: > release_firmware(mdt); > -err_put_node: > - of_node_put(node); > return ret; > } > > > --- > base-commit: 9f9f8ca6f012d25428f8605cb36369a449db8508 > change-id: 20230529-venus-of-rmem-f649885114fd > > Best regards,
