From: Bjorn Helgaas <helgaas@kernel.org>
To: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc: "Bjorn Helgaas" <bhelgaas@google.com>,
linux-pci@vger.kernel.org,
"Rick Wertenbroek" <rick.wertenbroek@gmail.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Manivannan Sadhasivam" <mani@kernel.org>,
"Kishon Vijay Abraham I" <kishon@kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
Subject: Re: [PATCH v4 06/17] PCI: epf-test: Simplify read/write/copy test functions
Date: Fri, 14 Apr 2023 11:06:39 -0500 [thread overview]
Message-ID: <20230414160639.GA197390@bhelgaas> (raw)
In-Reply-To: <20230330085357.2653599-7-damien.lemoal@opensource.wdc.com>
On Thu, Mar 30, 2023 at 05:53:46PM +0900, Damien Le Moal wrote:
> The function pci_epf_test_cmd_handler() casts the register bar to a
> struct pci_epf_test_reg to determine the command sent by the host and
> execute the test function accordingly. So there is no need for doing
> this cast again in each of the read, write and copy test functions. We
> can simply pass the reg pointer as an argument to the functions
> pci_epf_test_write(), pci_epf_test_read() and pci_epf_test_copy().
s/bar/BAR/ in English text (as opposed to C code).
"Casting a register BAR" doesn't read quite right though, and I don't
see any casts below.
It looks like pci_epf_test_cmd_handler() looks up the pci_epf_test_reg
corresponding to epf_test->test_reg_bar, and this patch passes that
"struct pci_epf_test_reg *" around instead of having each function
look it up again?
> Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
> ---
> drivers/pci/endpoint/functions/pci-epf-test.c | 21 ++++++++-----------
> 1 file changed, 9 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 7cdc6c915ef5..b8b178ac7cda 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -325,7 +325,8 @@ static void pci_epf_test_print_rate(const char *ops, u64 size,
> (u64)ts.tv_sec, (u32)ts.tv_nsec, rate / 1024);
> }
>
> -static int pci_epf_test_copy(struct pci_epf_test *epf_test)
> +static int pci_epf_test_copy(struct pci_epf_test *epf_test,
> + struct pci_epf_test_reg *reg)
> {
> int ret;
> bool use_dma;
> @@ -337,8 +338,6 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
> struct pci_epf *epf = epf_test->epf;
> struct device *dev = &epf->dev;
> struct pci_epc *epc = epf->epc;
> - enum pci_barno test_reg_bar = epf_test->test_reg_bar;
> - struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
>
> src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size);
> if (!src_addr) {
> @@ -424,7 +423,8 @@ static int pci_epf_test_copy(struct pci_epf_test *epf_test)
> return ret;
> }
>
> -static int pci_epf_test_read(struct pci_epf_test *epf_test)
> +static int pci_epf_test_read(struct pci_epf_test *epf_test,
> + struct pci_epf_test_reg *reg)
> {
> int ret;
> void __iomem *src_addr;
> @@ -438,8 +438,6 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
> struct device *dev = &epf->dev;
> struct pci_epc *epc = epf->epc;
> struct device *dma_dev = epf->epc->dev.parent;
> - enum pci_barno test_reg_bar = epf_test->test_reg_bar;
> - struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
>
> src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
> if (!src_addr) {
> @@ -514,7 +512,8 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
> return ret;
> }
>
> -static int pci_epf_test_write(struct pci_epf_test *epf_test)
> +static int pci_epf_test_write(struct pci_epf_test *epf_test,
> + struct pci_epf_test_reg *reg)
> {
> int ret;
> void __iomem *dst_addr;
> @@ -527,8 +526,6 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test)
> struct device *dev = &epf->dev;
> struct pci_epc *epc = epf->epc;
> struct device *dma_dev = epf->epc->dev.parent;
> - enum pci_barno test_reg_bar = epf_test->test_reg_bar;
> - struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
>
> dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
> if (!dst_addr) {
> @@ -673,7 +670,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
> }
>
> if (command & COMMAND_WRITE) {
> - ret = pci_epf_test_write(epf_test);
> + ret = pci_epf_test_write(epf_test, reg);
> if (ret)
> reg->status |= STATUS_WRITE_FAIL;
> else
> @@ -684,7 +681,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
> }
>
> if (command & COMMAND_READ) {
> - ret = pci_epf_test_read(epf_test);
> + ret = pci_epf_test_read(epf_test, reg);
> if (!ret)
> reg->status |= STATUS_READ_SUCCESS;
> else
> @@ -695,7 +692,7 @@ static void pci_epf_test_cmd_handler(struct work_struct *work)
> }
>
> if (command & COMMAND_COPY) {
> - ret = pci_epf_test_copy(epf_test);
> + ret = pci_epf_test_copy(epf_test, reg);
> if (!ret)
> reg->status |= STATUS_COPY_SUCCESS;
> else
> --
> 2.39.2
>
next prev parent reply other threads:[~2023-04-14 16:06 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-30 8:53 [PATCH v4 00/17] PCI endpoint fixes and improvements Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 01/17] PCI: endpoint: Automatically create a function specific attributes group Damien Le Moal
2023-03-31 5:22 ` Manivannan Sadhasivam
2023-03-31 7:16 ` Damien Le Moal
2023-04-14 15:58 ` Bjorn Helgaas
2023-04-15 0:55 ` Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 02/17] PCI: endpoint: Move pci_epf_type_add_cfs() code Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 03/17] PCI: epf-test: Fix DMA transfer completion initialization Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 04/17] PCI: epf-test: Fix DMA transfer completion detection Damien Le Moal
2023-03-31 5:25 ` Manivannan Sadhasivam
2023-04-04 9:47 ` Shunsuke Mie
2023-04-04 10:16 ` Damien Le Moal
2023-04-04 10:30 ` Shunsuke Mie
2023-04-13 1:50 ` Damien Le Moal
2023-04-14 15:41 ` Bjorn Helgaas
2023-04-14 15:45 ` Bjorn Helgaas
2023-04-14 16:00 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 05/17] PCI: epf-test: Use dmaengine_submit() to initiate DMA transfer Damien Le Moal
2023-03-30 8:53 ` [PATCH v4 06/17] PCI: epf-test: Simplify read/write/copy test functions Damien Le Moal
2023-04-14 16:06 ` Bjorn Helgaas [this message]
2023-03-30 8:53 ` [PATCH v4 07/17] PCI: epf-test: Simplify pci_epf_test_raise_irq() Damien Le Moal
2023-04-14 16:08 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 08/17] PCI: epf-test: Simplify IRQ test commands execution Damien Le Moal
2023-04-14 16:09 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 09/17] PCI: epf-test: Improve handling of command and status registers Damien Le Moal
2023-04-14 16:11 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 10/17] PCI: epf-test: Cleanup pci_epf_test_cmd_handler() Damien Le Moal
2023-04-14 16:12 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 11/17] PCI: epf-test: Cleanup request result handling Damien Le Moal
2023-03-31 5:28 ` Manivannan Sadhasivam
2023-03-30 8:53 ` [PATCH v4 12/17] PCI: epf-test: Simplify DMA support checks Damien Le Moal
2023-04-14 16:14 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 13/17] PCI: epf-test: Simplify transfers result print Damien Le Moal
2023-04-14 16:17 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 14/17] misc: pci_endpoint_test: Free IRQs before removing the device Damien Le Moal
2023-04-14 16:17 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 15/17] misc: pci_endpoint_test: Re-init completion for every test Damien Le Moal
2023-03-31 5:29 ` Manivannan Sadhasivam
2023-03-30 8:53 ` [PATCH v4 16/17] misc: pci_endpoint_test: Do not write status in IRQ handler Damien Le Moal
2023-04-14 16:18 ` Bjorn Helgaas
2023-03-30 8:53 ` [PATCH v4 17/17] misc: pci_endpoint_test: Simplify pci_endpoint_test_msi_irq() Damien Le Moal
2023-04-14 16:19 ` Bjorn Helgaas
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