static int storvsc_change_queue_depth(struct scsi_device *sdev, int queue_depth);
static int storvsc_vcpus_per_sub_channel = 4;
+static unsigned int storvsc_max_hw_queues;
module_param(storvsc_ringbuffer_size, int, S_IRUGO);
MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
+module_param(storvsc_max_hw_queues, uint, 0644);
+MODULE_PARM_DESC(storvsc_max_hw_queues, "Maximum number of hardware queues");
+
module_param(storvsc_vcpus_per_sub_channel, int, S_IRUGO);
MODULE_PARM_DESC(storvsc_vcpus_per_sub_channel, "Ratio of VCPUs to subchannels");
struct storvsc_cmd_request *cmd_request = scsi_cmd_priv(scmnd);
int i;
struct scatterlist *sgl;
- unsigned int sg_count = 0;
+ unsigned int sg_count;
struct vmscsi_request *vm_srb;
- struct scatterlist *cur_sgl;
struct vmbus_packet_mpb_array *payload;
u32 payload_sz;
u32 length;
payload_sz = sizeof(cmd_request->mpb);
if (sg_count) {
- unsigned int hvpgoff = 0;
- unsigned long offset_in_hvpg = sgl->offset & ~HV_HYP_PAGE_MASK;
+ unsigned int hvpgoff, hvpfns_to_add;
+ unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset);
unsigned int hvpg_count = HVPFN_UP(offset_in_hvpg + length);
u64 hvpfn;
return SCSI_MLQUEUE_DEVICE_BUSY;
}
- /*
- * sgl is a list of PAGEs, and payload->range.pfn_array
- * expects the page number in the unit of HV_HYP_PAGE_SIZE (the
- * page size that Hyper-V uses, so here we need to divide PAGEs
- * into HV_HYP_PAGE in case that PAGE_SIZE > HV_HYP_PAGE_SIZE.
- * Besides, payload->range.offset should be the offset in one
- * HV_HYP_PAGE.
- */
payload->range.len = length;
payload->range.offset = offset_in_hvpg;
- hvpgoff = sgl->offset >> HV_HYP_PAGE_SHIFT;
- cur_sgl = sgl;
- for (i = 0; i < hvpg_count; i++) {
+
+ for (i = 0; sgl != NULL; sgl = sg_next(sgl)) {
/*
- * 'i' is the index of hv pages in the payload and
- * 'hvpgoff' is the offset (in hv pages) of the first
- * hv page in the the first page. The relationship
- * between the sum of 'i' and 'hvpgoff' and the offset
- * (in hv pages) in a payload page ('hvpgoff_in_page')
- * is as follow:
- *
- * |------------------ PAGE -------------------|
- * | NR_HV_HYP_PAGES_IN_PAGE hvpgs in total |
- * |hvpg|hvpg| ... |hvpg|... |hvpg|
- * ^ ^ ^ ^
- * +-hvpgoff-+ +-hvpgoff_in_page-+
- * ^ |
- * +--------------------- i ---------------------------+
+ * Init values for the current sgl entry. hvpgoff
+ * and hvpfns_to_add are in units of Hyper-V size
+ * pages. Handling the PAGE_SIZE != HV_HYP_PAGE_SIZE
+ * case also handles values of sgl->offset that are
+ * larger than PAGE_SIZE. Such offsets are handled
+ * even on other than the first sgl entry, provided
+ * they are a multiple of PAGE_SIZE.
*/
- unsigned int hvpgoff_in_page =
- (i + hvpgoff) % NR_HV_HYP_PAGES_IN_PAGE;
+ hvpgoff = HVPFN_DOWN(sgl->offset);
+ hvpfn = page_to_hvpfn(sg_page(sgl)) + hvpgoff;
+ hvpfns_to_add = HVPFN_UP(sgl->offset + sgl->length) -
+ hvpgoff;
/*
- * Two cases that we need to fetch a page:
- * 1) i == 0, the first step or
- * 2) hvpgoff_in_page == 0, when we reach the boundary
- * of a page.
+ * Fill the next portion of the PFN array with
+ * sequential Hyper-V PFNs for the continguous physical
+ * memory described by the sgl entry. The end of the
+ * last sgl should be reached at the same time that
+ * the PFN array is filled.
*/
- if (hvpgoff_in_page == 0 || i == 0) {
- hvpfn = page_to_hvpfn(sg_page(cur_sgl));
- cur_sgl = sg_next(cur_sgl);
- }
-
- payload->range.pfn_array[i] = hvpfn + hvpgoff_in_page;
+ while (hvpfns_to_add--)
+ payload->range.pfn_array[i++] = hvpfn++;
}
}
.slave_configure = storvsc_device_configure,
.cmd_per_lun = 2048,
.this_id = -1,
- /* Make sure we dont get a sg segment crosses a page boundary */
- .dma_boundary = PAGE_SIZE-1,
/* Ensure there are no gaps in presented sgls */
.virt_boundary_mask = PAGE_SIZE-1,
.no_write_same = 1,
{
int ret;
int num_cpus = num_online_cpus();
+ int num_present_cpus = num_present_cpus();
struct Scsi_Host *host;
struct hv_host_device *host_dev;
bool dev_is_ide = ((dev_id->driver_data == IDE_GUID) ? true : false);
* For non-IDE disks, the host supports multiple channels.
* Set the number of HW queues we are supporting.
*/
- if (!dev_is_ide)
- host->nr_hw_queues = num_present_cpus();
+ if (!dev_is_ide) {
+ if (storvsc_max_hw_queues > num_present_cpus) {
+ storvsc_max_hw_queues = 0;
+ storvsc_log(device, STORVSC_LOGGING_WARN,
+ "Resetting invalid storvsc_max_hw_queues value to default.\n");
+ }
+ if (storvsc_max_hw_queues)
+ host->nr_hw_queues = storvsc_max_hw_queues;
+ else
+ host->nr_hw_queues = num_present_cpus;
+ }
/*
* Set the error handler work queue.
projects / linux-2.6-microblaze.git / blobdiff